lib/nss_wrapper/nss_wrapper.c

   1 /*
   2  * Copyright (C) Stefan Metzmacher 2007 <metze@samba.org>
   3  * Copyright (C) Guenther Deschner 2009 <gd@samba.org>
   4  * Copyright (C) Andreas Schneider 2013 <asn@samba.org>
   5  *
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the author nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "config.h"
  37
  38 #include <pthread.h>
  39
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <sys/socket.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <stdarg.h>
  46 #include <stdbool.h>
  47 #include <stddef.h>
  48 #include <stdio.h>
  49 #include <stdint.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include <ctype.h>
  54
  55 #include <search.h>
  56 #include <assert.h>
  57
  58 /*
  59  * Defining _POSIX_PTHREAD_SEMANTICS before including pwd.h and grp.h  gives us
  60  * the posix getpwnam_r(), getpwuid_r(), getgrnam_r and getgrgid_r calls on
  61  * Solaris
  62  */
  63 #ifndef _POSIX_PTHREAD_SEMANTICS
  64 #define _POSIX_PTHREAD_SEMANTICS
  65 #endif
  66
  67 #include <pwd.h>
  68 #include <grp.h>
  69 #ifdef HAVE_SHADOW_H
  70 #include <shadow.h>
  71 #endif /* HAVE_SHADOW_H */
  72
  73 #include <netdb.h>
  74 #include <arpa/inet.h>
  75 #include <netinet/in.h>
  76
  77 #include <dlfcn.h>
  78
  79 #if defined(HAVE_NSS_H)
  80 /* Linux and BSD */
  81 #include <nss.h>
  82
  83 typedef enum nss_status NSS_STATUS;
  84 #elif defined(HAVE_NSS_COMMON_H)
  85 /* Solaris */
  86 #include <nss_common.h>
  87 #include <nss_dbdefs.h>
  88 #include <nsswitch.h>
  89
  90 typedef nss_status_t NSS_STATUS;
  91
  92 # define NSS_STATUS_SUCCESS     NSS_SUCCESS
  93 # define NSS_STATUS_NOTFOUND    NSS_NOTFOUND
  94 # define NSS_STATUS_UNAVAIL     NSS_UNAVAIL
  95 # define NSS_STATUS_TRYAGAIN    NSS_TRYAGAIN
  96 #else
  97 # error "No nsswitch support detected"
  98 #endif
  99
 100 #ifndef PTR_DIFF
 101 #define PTR_DIFF(p1, p2) ((ptrdiff_t)(((const char *)(p1)) - (const char *)(p2)))
 102 #endif
 103
 104 #ifndef _PUBLIC_
 105 #define _PUBLIC_
 106 #endif
 107
 108 #ifndef EAI_NODATA
 109 #define EAI_NODATA EAI_NONAME
 110 #endif
 111
 112 #ifndef EAI_ADDRFAMILY
 113 #define EAI_ADDRFAMILY EAI_FAMILY
 114 #endif
 115
 116 #ifndef __STRING
 117 #define __STRING(x)    #x
 118 #endif
 119
 120 #ifndef __STRINGSTRING
 121 #define __STRINGSTRING(x) __STRING(x)
 122 #endif
 123
 124 #ifndef __LINESTR__
 125 #define __LINESTR__ __STRINGSTRING(__LINE__)
 126 #endif
 127
 128 #ifndef __location__
 129 #define __location__ __FILE__ ":" __LINESTR__
 130 #endif
 131
 132 #ifndef DNS_NAME_MAX
 133 #define DNS_NAME_MAX 255
 134 #endif
 135
 136 /* GCC have printf type attribute check. */
 137 #ifdef HAVE_ATTRIBUTE_PRINTF_FORMAT
 138 #define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
 139 #else
 140 #define PRINTF_ATTRIBUTE(a,b)
 141 #endif /* HAVE_ATTRIBUTE_PRINTF_FORMAT */
 142
 143 #ifdef HAVE_DESTRUCTOR_ATTRIBUTE
 144 #define DESTRUCTOR_ATTRIBUTE __attribute__ ((destructor))
 145 #else
 146 #define DESTRUCTOR_ATTRIBUTE
 147 #endif /* HAVE_DESTRUCTOR_ATTRIBUTE */
 148
 149 #define ZERO_STRUCTP(x) do { if ((x) != NULL) memset((char *)(x), 0, sizeof(*(x))); } while(0)
 150
 151 #ifndef SAFE_FREE
 152 #define SAFE_FREE(x) do { if ((x) != NULL) {free(x); (x)=NULL;} } while(0)
 153 #endif
 154
 155 #ifdef HAVE_IPV6
 156 #define NWRAP_INET_ADDRSTRLEN INET6_ADDRSTRLEN
 157 #else
 158 #define NWRAP_INET_ADDRSTRLEN INET_ADDRSTRLEN
 159 #endif
 160
 161 #define NWRAP_LOCK(m) do { \
 162         pthread_mutex_lock(&( m ## _mutex)); \
 163 } while(0)
 164
 165 #define NWRAP_UNLOCK(m) do { \
 166         pthread_mutex_unlock(&( m ## _mutex)); \
 167 } while(0)
 168
 169
 170 static bool nwrap_initialized = false;
 171 static pthread_mutex_t nwrap_initialized_mutex = PTHREAD_MUTEX_INITIALIZER;
 172
 173 /* The mutex or accessing the id */
 174 static pthread_mutex_t nwrap_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 175 static pthread_mutex_t nwrap_gr_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 176 static pthread_mutex_t nwrap_he_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 177 static pthread_mutex_t nwrap_pw_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 178 static pthread_mutex_t nwrap_sp_global_mutex = PTHREAD_MUTEX_INITIALIZER;
 179
 180 /* Add new global locks here please */
 181 /* Also don't forget to add locks to
 182  * nwrap_init() function.
 183  */
 184 # define NWRAP_LOCK_ALL do { \
 185         NWRAP_LOCK(nwrap_initialized); \
 186         NWRAP_LOCK(nwrap_global); \
 187         NWRAP_LOCK(nwrap_gr_global); \
 188         NWRAP_LOCK(nwrap_he_global); \
 189         NWRAP_LOCK(nwrap_pw_global); \
 190         NWRAP_LOCK(nwrap_sp_global); \
 191 } while (0);
 192
 193 # define NWRAP_UNLOCK_ALL do {\
 194         NWRAP_UNLOCK(nwrap_sp_global); \
 195         NWRAP_UNLOCK(nwrap_pw_global); \
 196         NWRAP_UNLOCK(nwrap_he_global); \
 197         NWRAP_UNLOCK(nwrap_gr_global); \
 198         NWRAP_UNLOCK(nwrap_global); \
 199         NWRAP_UNLOCK(nwrap_initialized); \
 200 } while (0);
 201
 202 static void nwrap_thread_prepare(void)
 203 {
 204         NWRAP_LOCK_ALL;
 205 }
 206
 207 static void nwrap_thread_parent(void)
 208 {
 209         NWRAP_UNLOCK_ALL;
 210 }
 211
 212 static void nwrap_thread_child(void)
 213 {
 214         NWRAP_UNLOCK_ALL;
 215 }
 216
 217 enum nwrap_dbglvl_e {
 218         NWRAP_LOG_ERROR = 0,
 219         NWRAP_LOG_WARN,
 220         NWRAP_LOG_DEBUG,
 221         NWRAP_LOG_TRACE
 222 };
 223
 224 #ifdef NDEBUG
 225 # define NWRAP_LOG(...)
 226 #else
 227
 228 static void nwrap_log(enum nwrap_dbglvl_e dbglvl, const char *func, const char *format, ...) PRINTF_ATTRIBUTE(3, 4);
 229 # define NWRAP_LOG(dbglvl, ...) nwrap_log((dbglvl), __func__, __VA_ARGS__)
 230
 231 static void nwrap_log(enum nwrap_dbglvl_e dbglvl,
 232                       const char *func,
 233                       const char *format, ...)
 234 {
 235         char buffer[1024];
 236         va_list va;
 237         const char *d;
 238         unsigned int lvl = 0;
 239         int pid = getpid();
 240
 241         d = getenv("NSS_WRAPPER_DEBUGLEVEL");
 242         if (d != NULL) {
 243                 lvl = atoi(d);
 244         }
 245
 246         va_start(va, format);
 247         vsnprintf(buffer, sizeof(buffer), format, va);
 248         va_end(va);
 249
 250         if (lvl >= dbglvl) {
 251                 switch (dbglvl) {
 252                         case NWRAP_LOG_ERROR:
 253                                 fprintf(stderr,
 254                                         "NWRAP_ERROR(%d) - %s: %s\n",
 255                                         pid, func, buffer);
 256                                 break;
 257                         case NWRAP_LOG_WARN:
 258                                 fprintf(stderr,
 259                                         "NWRAP_WARN(%d) - %s: %s\n",
 260                                         pid, func, buffer);
 261                                 break;
 262                         case NWRAP_LOG_DEBUG:
 263                                 fprintf(stderr,
 264                                         "NWRAP_DEBUG(%d) - %s: %s\n",
 265                                         pid, func, buffer);
 266                                 break;
 267                         case NWRAP_LOG_TRACE:
 268                                 fprintf(stderr,
 269                                         "NWRAP_TRACE(%d) - %s: %s\n",
 270                                         pid, func, buffer);
 271                                 break;
 272                 }
 273         }
 274 }
 275 #endif /* NDEBUG NWRAP_LOG */
 276
 277 struct nwrap_libc_fns {
 278         struct passwd *(*_libc_getpwnam)(const char *name);
 279         int (*_libc_getpwnam_r)(const char *name, struct passwd *pwd,
 280                        char *buf, size_t buflen, struct passwd **result);
 281         struct passwd *(*_libc_getpwuid)(uid_t uid);
 282         int (*_libc_getpwuid_r)(uid_t uid, struct passwd *pwd, char *buf, size_t buflen, struct passwd **result);
 283         void (*_libc_setpwent)(void);
 284         struct passwd *(*_libc_getpwent)(void);
 285 #ifdef HAVE_SOLARIS_GETPWENT_R
 286         struct passwd *(*_libc_getpwent_r)(struct passwd *pwbuf, char *buf, size_t buflen);
 287 #else
 288         int (*_libc_getpwent_r)(struct passwd *pwbuf, char *buf, size_t buflen, struct passwd **pwbufp);
 289 #endif
 290         void (*_libc_endpwent)(void);
 291         int (*_libc_initgroups)(const char *user, gid_t gid);
 292         struct group *(*_libc_getgrnam)(const char *name);
 293         int (*_libc_getgrnam_r)(const char *name, struct group *grp, char *buf, size_t buflen, struct group **result);
 294         struct group *(*_libc_getgrgid)(gid_t gid);
 295         int (*_libc_getgrgid_r)(gid_t gid, struct group *grp, char *buf, size_t buflen, struct group **result);
 296         void (*_libc_setgrent)(void);
 297         struct group *(*_libc_getgrent)(void);
 298 #ifdef HAVE_SOLARIS_GETGRENT_R
 299         struct group *(*_libc_getgrent_r)(struct group *group, char *buf, size_t buflen);
 300 #else
 301         int (*_libc_getgrent_r)(struct group *group, char *buf, size_t buflen, struct group **result);
 302 #endif
 303         void (*_libc_endgrent)(void);
 304         int (*_libc_getgrouplist)(const char *user, gid_t group, gid_t *groups, int *ngroups);
 305
 306         void (*_libc_sethostent)(int stayopen);
 307         struct hostent *(*_libc_gethostent)(void);
 308         void (*_libc_endhostent)(void);
 309
 310         struct hostent *(*_libc_gethostbyname)(const char *name);
 311 #ifdef HAVE_GETHOSTBYNAME2 /* GNU extension */
 312         struct hostent *(*_libc_gethostbyname2)(const char *name, int af);
 313 #endif
 314         struct hostent *(*_libc_gethostbyaddr)(const void *addr, socklen_t len, int type);
 315
 316         int (*_libc_getaddrinfo)(const char *node, const char *service,
 317                                  const struct addrinfo *hints,
 318                                  struct addrinfo **res);
 319         int (*_libc_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
 320                                  char *host, size_t hostlen,
 321                                  char *serv, size_t servlen,
 322                                  int flags);
 323         int (*_libc_gethostname)(char *name, size_t len);
 324 #ifdef HAVE_GETHOSTBYNAME_R
 325         int (*_libc_gethostbyname_r)(const char *name,
 326                                      struct hostent *ret,
 327                                      char *buf, size_t buflen,
 328                                      struct hostent **result, int *h_errnop);
 329 #endif
 330 #ifdef HAVE_GETHOSTBYADDR_R
 331         int (*_libc_gethostbyaddr_r)(const void *addr, socklen_t len, int type,
 332                                      struct hostent *ret,
 333                                      char *buf, size_t buflen,
 334                                      struct hostent **result, int *h_errnop);
 335 #endif
 336 };
 337
 338 struct nwrap_module_nss_fns {
 339         NSS_STATUS (*_nss_getpwnam_r)(const char *name, struct passwd *result, char *buffer,
 340                                       size_t buflen, int *errnop);
 341         NSS_STATUS (*_nss_getpwuid_r)(uid_t uid, struct passwd *result, char *buffer,
 342                                       size_t buflen, int *errnop);
 343         NSS_STATUS (*_nss_setpwent)(void);
 344         NSS_STATUS (*_nss_getpwent_r)(struct passwd *result, char *buffer,
 345                                       size_t buflen, int *errnop);
 346         NSS_STATUS (*_nss_endpwent)(void);
 347         NSS_STATUS (*_nss_initgroups)(const char *user, gid_t group, long int *start,
 348                                       long int *size, gid_t **groups, long int limit, int *errnop);
 349         NSS_STATUS (*_nss_getgrnam_r)(const char *name, struct group *result, char *buffer,
 350                                       size_t buflen, int *errnop);
 351         NSS_STATUS (*_nss_getgrgid_r)(gid_t gid, struct group *result, char *buffer,
 352                                       size_t buflen, int *errnop);
 353         NSS_STATUS (*_nss_setgrent)(void);
 354         NSS_STATUS (*_nss_getgrent_r)(struct group *result, char *buffer,
 355                                       size_t buflen, int *errnop);
 356         NSS_STATUS (*_nss_endgrent)(void);
 357 };
 358
 359 struct nwrap_backend {
 360         const char *name;
 361         const char *so_path;
 362         void *so_handle;
 363         struct nwrap_ops *ops;
 364         struct nwrap_module_nss_fns *fns;
 365 };
 366
 367 struct nwrap_ops {
 368         struct passwd * (*nw_getpwnam)(struct nwrap_backend *b,
 369                                        const char *name);
 370         int             (*nw_getpwnam_r)(struct nwrap_backend *b,
 371                                          const char *name, struct passwd *pwdst,
 372                                          char *buf, size_t buflen, struct passwd **pwdstp);
 373         struct passwd * (*nw_getpwuid)(struct nwrap_backend *b,
 374                                        uid_t uid);
 375         int             (*nw_getpwuid_r)(struct nwrap_backend *b,
 376                                          uid_t uid, struct passwd *pwdst,
 377                                          char *buf, size_t buflen, struct passwd **pwdstp);
 378         void            (*nw_setpwent)(struct nwrap_backend *b);
 379         struct passwd * (*nw_getpwent)(struct nwrap_backend *b);
 380         int             (*nw_getpwent_r)(struct nwrap_backend *b,
 381                                          struct passwd *pwdst, char *buf,
 382                                          size_t buflen, struct passwd **pwdstp);
 383         void            (*nw_endpwent)(struct nwrap_backend *b);
 384         int             (*nw_initgroups)(struct nwrap_backend *b,
 385                                          const char *user, gid_t group);
 386         struct group *  (*nw_getgrnam)(struct nwrap_backend *b,
 387                                        const char *name);
 388         int             (*nw_getgrnam_r)(struct nwrap_backend *b,
 389                                          const char *name, struct group *grdst,
 390                                          char *buf, size_t buflen, struct group **grdstp);
 391         struct group *  (*nw_getgrgid)(struct nwrap_backend *b,
 392                                        gid_t gid);
 393         int             (*nw_getgrgid_r)(struct nwrap_backend *b,
 394                                          gid_t gid, struct group *grdst,
 395                                          char *buf, size_t buflen, struct group **grdstp);
 396         void            (*nw_setgrent)(struct nwrap_backend *b);
 397         struct group *  (*nw_getgrent)(struct nwrap_backend *b);
 398         int             (*nw_getgrent_r)(struct nwrap_backend *b,
 399                                          struct group *grdst, char *buf,
 400                                          size_t buflen, struct group **grdstp);
 401         void            (*nw_endgrent)(struct nwrap_backend *b);
 402 };
 403
 404 /* Public prototypes */
 405
 406 bool nss_wrapper_enabled(void);
 407 bool nss_wrapper_shadow_enabled(void);
 408 bool nss_wrapper_hosts_enabled(void);
 409
 410 /* prototypes for files backend */
 411
 412
 413 static struct passwd *nwrap_files_getpwnam(struct nwrap_backend *b,
 414                                            const char *name);
 415 static int nwrap_files_getpwnam_r(struct nwrap_backend *b,
 416                                   const char *name, struct passwd *pwdst,
 417                                   char *buf, size_t buflen, struct passwd **pwdstp);
 418 static struct passwd *nwrap_files_getpwuid(struct nwrap_backend *b,
 419                                            uid_t uid);
 420 static int nwrap_files_getpwuid_r(struct nwrap_backend *b,
 421                                   uid_t uid, struct passwd *pwdst,
 422                                   char *buf, size_t buflen, struct passwd **pwdstp);
 423 static void nwrap_files_setpwent(struct nwrap_backend *b);
 424 static struct passwd *nwrap_files_getpwent(struct nwrap_backend *b);
 425 static int nwrap_files_getpwent_r(struct nwrap_backend *b,
 426                                   struct passwd *pwdst, char *buf,
 427                                   size_t buflen, struct passwd **pwdstp);
 428 static void nwrap_files_endpwent(struct nwrap_backend *b);
 429 static int nwrap_files_initgroups(struct nwrap_backend *b,
 430                                   const char *user, gid_t group);
 431 static struct group *nwrap_files_getgrnam(struct nwrap_backend *b,
 432                                           const char *name);
 433 static int nwrap_files_getgrnam_r(struct nwrap_backend *b,
 434                                   const char *name, struct group *grdst,
 435                                   char *buf, size_t buflen, struct group **grdstp);
 436 static struct group *nwrap_files_getgrgid(struct nwrap_backend *b,
 437                                           gid_t gid);
 438 static int nwrap_files_getgrgid_r(struct nwrap_backend *b,
 439                                   gid_t gid, struct group *grdst,
 440                                   char *buf, size_t buflen, struct group **grdstp);
 441 static void nwrap_files_setgrent(struct nwrap_backend *b);
 442 static struct group *nwrap_files_getgrent(struct nwrap_backend *b);
 443 static int nwrap_files_getgrent_r(struct nwrap_backend *b,
 444                                   struct group *grdst, char *buf,
 445                                   size_t buflen, struct group **grdstp);
 446 static void nwrap_files_endgrent(struct nwrap_backend *b);
 447
 448 /* prototypes for module backend */
 449
 450 static struct passwd *nwrap_module_getpwent(struct nwrap_backend *b);
 451 static int nwrap_module_getpwent_r(struct nwrap_backend *b,
 452                                    struct passwd *pwdst, char *buf,
 453                                    size_t buflen, struct passwd **pwdstp);
 454 static struct passwd *nwrap_module_getpwnam(struct nwrap_backend *b,
 455                                             const char *name);
 456 static int nwrap_module_getpwnam_r(struct nwrap_backend *b,
 457                                    const char *name, struct passwd *pwdst,
 458                                    char *buf, size_t buflen, struct passwd **pwdstp);
 459 static struct passwd *nwrap_module_getpwuid(struct nwrap_backend *b,
 460                                             uid_t uid);
 461 static int nwrap_module_getpwuid_r(struct nwrap_backend *b,
 462                                    uid_t uid, struct passwd *pwdst,
 463                                    char *buf, size_t buflen, struct passwd **pwdstp);
 464 static void nwrap_module_setpwent(struct nwrap_backend *b);
 465 static void nwrap_module_endpwent(struct nwrap_backend *b);
 466 static struct group *nwrap_module_getgrent(struct nwrap_backend *b);
 467 static int nwrap_module_getgrent_r(struct nwrap_backend *b,
 468                                    struct group *grdst, char *buf,
 469                                    size_t buflen, struct group **grdstp);
 470 static struct group *nwrap_module_getgrnam(struct nwrap_backend *b,
 471                                            const char *name);
 472 static int nwrap_module_getgrnam_r(struct nwrap_backend *b,
 473                                    const char *name, struct group *grdst,
 474                                    char *buf, size_t buflen, struct group **grdstp);
 475 static struct group *nwrap_module_getgrgid(struct nwrap_backend *b,
 476                                            gid_t gid);
 477 static int nwrap_module_getgrgid_r(struct nwrap_backend *b,
 478                                    gid_t gid, struct group *grdst,
 479                                    char *buf, size_t buflen, struct group **grdstp);
 480 static void nwrap_module_setgrent(struct nwrap_backend *b);
 481 static void nwrap_module_endgrent(struct nwrap_backend *b);
 482 static int nwrap_module_initgroups(struct nwrap_backend *b,
 483                                    const char *user, gid_t group);
 484
 485 struct nwrap_ops nwrap_files_ops = {
 486         .nw_getpwnam    = nwrap_files_getpwnam,
 487         .nw_getpwnam_r  = nwrap_files_getpwnam_r,
 488         .nw_getpwuid    = nwrap_files_getpwuid,
 489         .nw_getpwuid_r  = nwrap_files_getpwuid_r,
 490         .nw_setpwent    = nwrap_files_setpwent,
 491         .nw_getpwent    = nwrap_files_getpwent,
 492         .nw_getpwent_r  = nwrap_files_getpwent_r,
 493         .nw_endpwent    = nwrap_files_endpwent,
 494         .nw_initgroups  = nwrap_files_initgroups,
 495         .nw_getgrnam    = nwrap_files_getgrnam,
 496         .nw_getgrnam_r  = nwrap_files_getgrnam_r,
 497         .nw_getgrgid    = nwrap_files_getgrgid,
 498         .nw_getgrgid_r  = nwrap_files_getgrgid_r,
 499         .nw_setgrent    = nwrap_files_setgrent,
 500         .nw_getgrent    = nwrap_files_getgrent,
 501         .nw_getgrent_r  = nwrap_files_getgrent_r,
 502         .nw_endgrent    = nwrap_files_endgrent,
 503 };
 504
 505 struct nwrap_ops nwrap_module_ops = {
 506         .nw_getpwnam    = nwrap_module_getpwnam,
 507         .nw_getpwnam_r  = nwrap_module_getpwnam_r,
 508         .nw_getpwuid    = nwrap_module_getpwuid,
 509         .nw_getpwuid_r  = nwrap_module_getpwuid_r,
 510         .nw_setpwent    = nwrap_module_setpwent,
 511         .nw_getpwent    = nwrap_module_getpwent,
 512         .nw_getpwent_r  = nwrap_module_getpwent_r,
 513         .nw_endpwent    = nwrap_module_endpwent,
 514         .nw_initgroups  = nwrap_module_initgroups,
 515         .nw_getgrnam    = nwrap_module_getgrnam,
 516         .nw_getgrnam_r  = nwrap_module_getgrnam_r,
 517         .nw_getgrgid    = nwrap_module_getgrgid,
 518         .nw_getgrgid_r  = nwrap_module_getgrgid_r,
 519         .nw_setgrent    = nwrap_module_setgrent,
 520         .nw_getgrent    = nwrap_module_getgrent,
 521         .nw_getgrent_r  = nwrap_module_getgrent_r,
 522         .nw_endgrent    = nwrap_module_endgrent,
 523 };
 524
 525 struct nwrap_libc {
 526         void *handle;
 527         void *nsl_handle;
 528         void *sock_handle;
 529         struct nwrap_libc_fns *fns;
 530 };
 531
 532 struct nwrap_main {
 533         int num_backends;
 534         struct nwrap_backend *backends;
 535         struct nwrap_libc *libc;
 536 };
 537
 538 static struct nwrap_main *nwrap_main_global;
 539 static struct nwrap_main __nwrap_main_global;
 540
 541 /*
 542  * PROTOTYPES
 543  */
 544 static int nwrap_convert_he_ai(const struct hostent *he,
 545                                unsigned short port,
 546                                const struct addrinfo *hints,
 547                                struct addrinfo **pai,
 548                                bool skip_canonname);
 549
 550 /*
 551  * VECTORS
 552  */
 553
 554 #define DEFAULT_VECTOR_CAPACITY 16
 555
 556 struct nwrap_vector {
 557         void **items;
 558         size_t count;
 559         size_t capacity;
 560 };
 561
 562 /* Macro returns pointer to first element of vector->items array.
 563  *
 564  * nwrap_vector is used as a memory backend which take care of
 565  * memory allocations and other stuff like memory growing.
 566  * nwrap_vectors should not be considered as some abstract structures.
 567  * On this level, vectors are more handy than direct realloc/malloc
 568  * calls.
 569  *
 570  * nwrap_vector->items is array inside nwrap_vector which can be
 571  * directly pointed by libc structure assembled by cwrap itself.
 572  *
 573  * EXAMPLE:
 574  *
 575  * 1) struct hostent contains char **h_addr_list element.
 576  * 2) nwrap_vector holds array of pointers to addresses.
 577  *    It's easier to use vector to store results of
 578  *    file parsing etc.
 579  *
 580  * Now, pretend that cwrap assembled struct hostent and
 581  * we need to set h_addr_list to point to nwrap_vector.
 582  * Idea behind is to shield users from internal nwrap_vector
 583  * implementation.
 584  * (Yes, not fully - array terminated by NULL is needed because
 585  * it's result expected by libc function caller.)
 586  *
 587  *
 588  * CODE EXAMPLE:
 589  *
 590  * struct hostent he;
 591  * struct nwrap_vector *vector = malloc(sizeof(struct nwrap_vector));
 592  * ... don't care about failed allocation now ...
 593  *
 594  * ... fill nwrap vector ...
 595  *
 596  * struct hostent he;
 597  * he.h_addr_list = nwrap_vector_head(vector);
 598  *
 599  */
 600 #define nwrap_vector_head(vect) ((void *)((vect)->items))
 601
 602 #define nwrap_vector_foreach(item, vect, iter) \
 603         for (iter = 0, (item) = (vect).items == NULL ? NULL : (vect).items[0]; \
 604              item != NULL; \
 605              (item) = (vect).items[++iter])
 606
 607 #define nwrap_vector_is_initialized(vector) ((vector)->items != NULL)
 608
 609 static inline bool nwrap_vector_init(struct nwrap_vector *const vector)
 610 {
 611         if (vector == NULL) {
 612                 return false;
 613         }
 614
 615         /* count is initialized by ZERO_STRUCTP */
 616         ZERO_STRUCTP(vector);
 617         vector->items = malloc(sizeof(void *) * (DEFAULT_VECTOR_CAPACITY + 1));
 618         if (vector->items == NULL) {
 619                 return false;
 620         }
 621         vector->capacity = DEFAULT_VECTOR_CAPACITY;
 622         memset(vector->items, '\0', sizeof(void *) * (DEFAULT_VECTOR_CAPACITY + 1));
 623
 624         return true;
 625 }
 626
 627 static bool nwrap_vector_add_item(struct nwrap_vector *vector, void *const item)
 628 {
 629         assert (vector != NULL);
 630
 631         if (vector->items == NULL) {
 632                 nwrap_vector_init(vector);
 633         }
 634
 635         if (vector->count == vector->capacity) {
 636                 /* Items array _MUST_ be NULL terminated because it's passed
 637                  * as result to caller which expect NULL terminated array from libc.
 638                  */
 639                 void **items = realloc(vector->items, sizeof(void *) * ((vector->capacity * 2) + 1));
 640                 if (items == NULL) {
 641                         return false;
 642                 }
 643                 vector->items = items;
 644
 645                 /* Don't count ending NULL to capacity */
 646                 vector->capacity *= 2;
 647         }
 648
 649         vector->items[vector->count] = item;
 650
 651         vector->count += 1;
 652         vector->items[vector->count] = NULL;
 653
 654         return true;
 655 }
 656
 657 static bool nwrap_vector_merge(struct nwrap_vector *dst,
 658                                struct nwrap_vector *src)
 659 {
 660         void **dst_items = NULL;
 661         size_t count;
 662
 663         if (src->count == 0) {
 664                 return true;
 665         }
 666
 667         count = dst->count + src->count;
 668
 669         /* We don't need reallocation if we have enough capacity. */
 670         if (src->count > (dst->capacity - dst->count)) {
 671                 dst_items = (void **)realloc(dst->items, (count + 1) * sizeof(void *));
 672                 if (dst_items == NULL) {
 673                         return false;
 674                 }
 675                 dst->items = dst_items;
 676                 dst->capacity = count;
 677         }
 678
 679         memcpy((void *)(((long *)dst->items) + dst->count),
 680                src->items,
 681                src->count * sizeof(void *));
 682         dst->count = count;
 683
 684         return true;
 685 }
 686
 687 struct nwrap_cache {
 688         const char *path;
 689         int fd;
 690         FILE *fp;
 691         struct stat st;
 692         void *private_data;
 693
 694         struct nwrap_vector lines;
 695
 696         bool (*parse_line)(struct nwrap_cache *, char *line);
 697         void (*unload)(struct nwrap_cache *);
 698 };
 699
 700 /* passwd */
 701 struct nwrap_pw {
 702         struct nwrap_cache *cache;
 703
 704         struct passwd *list;
 705         int num;
 706         int idx;
 707 };
 708
 709 struct nwrap_cache __nwrap_cache_pw;
 710 struct nwrap_pw nwrap_pw_global;
 711
 712 static bool nwrap_pw_parse_line(struct nwrap_cache *nwrap, char *line);
 713 static void nwrap_pw_unload(struct nwrap_cache *nwrap);
 714
 715 /* shadow */
 716 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
 717 struct nwrap_sp {
 718         struct nwrap_cache *cache;
 719
 720         struct spwd *list;
 721         int num;
 722         int idx;
 723 };
 724
 725 struct nwrap_cache __nwrap_cache_sp;
 726 struct nwrap_sp nwrap_sp_global;
 727
 728 static bool nwrap_sp_parse_line(struct nwrap_cache *nwrap, char *line);
 729 static void nwrap_sp_unload(struct nwrap_cache *nwrap);
 730 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
 731
 732 /* group */
 733 struct nwrap_gr {
 734         struct nwrap_cache *cache;
 735
 736         struct group *list;
 737         int num;
 738         int idx;
 739 };
 740
 741 struct nwrap_cache __nwrap_cache_gr;
 742 struct nwrap_gr nwrap_gr_global;
 743
 744 /* hosts */
 745 static bool nwrap_he_parse_line(struct nwrap_cache *nwrap, char *line);
 746 static void nwrap_he_unload(struct nwrap_cache *nwrap);
 747
 748 struct nwrap_addrdata {
 749         unsigned char host_addr[16]; /* IPv4 or IPv6 address */
 750 };
 751
 752 static size_t max_hostents = 100;
 753
 754 struct nwrap_entdata {
 755         struct nwrap_addrdata addr;
 756         struct hostent ht;
 757
 758         struct nwrap_vector nwrap_addrdata;
 759
 760         ssize_t aliases_count;
 761 };
 762
 763 struct nwrap_entlist {
 764         struct nwrap_entlist *next;
 765         struct nwrap_entdata *ed;
 766 };
 767
 768 struct nwrap_he {
 769         struct nwrap_cache *cache;
 770
 771         struct nwrap_entdata *list;
 772         struct nwrap_vector entdata;
 773
 774         int num;
 775         int idx;
 776 };
 777
 778 static struct nwrap_cache __nwrap_cache_he;
 779 static struct nwrap_he nwrap_he_global;
 780
 781
 782 /*********************************************************
 783  * NWRAP PROTOTYPES
 784  *********************************************************/
 785
 786 static void nwrap_init(void);
 787 static bool nwrap_gr_parse_line(struct nwrap_cache *nwrap, char *line);
 788 static void nwrap_gr_unload(struct nwrap_cache *nwrap);
 789 void nwrap_destructor(void) DESTRUCTOR_ATTRIBUTE;
 790
 791 /*********************************************************
 792  * NWRAP LIBC LOADER FUNCTIONS
 793  *********************************************************/
 794
 795 enum nwrap_lib {
 796     NWRAP_LIBC,
 797     NWRAP_LIBNSL,
 798     NWRAP_LIBSOCKET,
 799 };
 800
 801 #ifndef NDEBUG
 802 static const char *nwrap_str_lib(enum nwrap_lib lib)
 803 {
 804         switch (lib) {
 805         case NWRAP_LIBC:
 806                 return "libc";
 807         case NWRAP_LIBNSL:
 808                 return "libnsl";
 809         case NWRAP_LIBSOCKET:
 810                 return "libsocket";
 811         }
 812
 813         /* Compiler would warn us about unhandled enum value if we get here */
 814         return "unknown";
 815 }
 816 #endif
 817
 818 static void *nwrap_load_lib_handle(enum nwrap_lib lib)
 819 {
 820         int flags = RTLD_LAZY;
 821         void *handle = NULL;
 822         int i;
 823
 824 #ifdef RTLD_DEEPBIND
 825         flags |= RTLD_DEEPBIND;
 826 #endif
 827
 828         switch (lib) {
 829         case NWRAP_LIBNSL:
 830 #ifdef HAVE_LIBNSL
 831                 handle = nwrap_main_global->libc->nsl_handle;
 832                 if (handle == NULL) {
 833                         for (i = 10; i >= 0; i--) {
 834                                 char soname[256] = {0};
 835
 836                                 snprintf(soname, sizeof(soname), "libnsl.so.%d", i);
 837                                 handle = dlopen(soname, flags);
 838                                 if (handle != NULL) {
 839                                         break;
 840                                 }
 841                         }
 842
 843                         nwrap_main_global->libc->nsl_handle = handle;
 844                 }
 845                 break;
 846 #endif
 847                 /* FALL TROUGH */
 848         case NWRAP_LIBSOCKET:
 849 #ifdef HAVE_LIBSOCKET
 850                 handle = nwrap_main_global->libc->sock_handle;
 851                 if (handle == NULL) {
 852                         for (i = 10; i >= 0; i--) {
 853                                 char soname[256] = {0};
 854
 855                                 snprintf(soname, sizeof(soname), "libsocket.so.%d", i);
 856                                 handle = dlopen(soname, flags);
 857                                 if (handle != NULL) {
 858                                         break;
 859                                 }
 860                         }
 861
 862                         nwrap_main_global->libc->sock_handle = handle;
 863                 }
 864                 break;
 865 #endif
 866                 /* FALL TROUGH */
 867         case NWRAP_LIBC:
 868                 handle = nwrap_main_global->libc->handle;
 869                 if (handle == NULL) {
 870                         for (i = 10; i >= 0; i--) {
 871                                 char soname[256] = {0};
 872
 873                                 snprintf(soname, sizeof(soname), "libc.so.%d", i);
 874                                 handle = dlopen(soname, flags);
 875                                 if (handle != NULL) {
 876                                         break;
 877                                 }
 878                         }
 879
 880                         nwrap_main_global->libc->handle = handle;
 881                 }
 882                 break;
 883         }
 884
 885         if (handle == NULL) {
 886 #ifdef RTLD_NEXT
 887                 handle = nwrap_main_global->libc->handle
 888                        = nwrap_main_global->libc->sock_handle
 889                        = nwrap_main_global->libc->nsl_handle
 890                        = RTLD_NEXT;
 891 #else
 892                 NWRAP_LOG(NWRAP_LOG_ERROR,
 893                           "Failed to dlopen library: %s\n",
 894                           dlerror());
 895                 exit(-1);
 896 #endif
 897         }
 898
 899         return handle;
 900 }
 901
 902 static void *_nwrap_load_lib_function(enum nwrap_lib lib, const char *fn_name)
 903 {
 904         void *handle;
 905         void *func;
 906
 907         nwrap_init();
 908
 909         handle = nwrap_load_lib_handle(lib);
 910
 911         func = dlsym(handle, fn_name);
 912         if (func == NULL) {
 913                 NWRAP_LOG(NWRAP_LOG_ERROR,
 914                                 "Failed to find %s: %s\n",
 915                                 fn_name, dlerror());
 916                 exit(-1);
 917         }
 918
 919         NWRAP_LOG(NWRAP_LOG_TRACE,
 920                         "Loaded %s from %s",
 921                         fn_name, nwrap_str_lib(lib));
 922         return func;
 923 }
 924
 925 #define nwrap_load_lib_function(lib, fn_name) \
 926         if (nwrap_main_global->libc->fns->_libc_##fn_name == NULL) { \
 927                 *(void **) (&nwrap_main_global->libc->fns->_libc_##fn_name) = \
 928                         _nwrap_load_lib_function(lib, #fn_name); \
 929         }
 930
 931 /* INTERNAL HELPER FUNCTIONS */
 932 static void nwrap_lines_unload(struct nwrap_cache *const nwrap)
 933 {
 934         size_t p;
 935         void *item;
 936         nwrap_vector_foreach(item, nwrap->lines, p) {
 937                 /* Maybe some vectors were merged ... */
 938                 SAFE_FREE(item);
 939         }
 940         SAFE_FREE(nwrap->lines.items);
 941         ZERO_STRUCTP(&nwrap->lines);
 942 }
 943
 944 /*
 945  * IMPORTANT
 946  *
 947  * Functions expeciall from libc need to be loaded individually, you can't load
 948  * all at once or gdb will segfault at startup. The same applies to valgrind and
 949  * has probably something todo with with the linker.
 950  * So we need load each function at the point it is called the first time.
 951  */
 952 static struct passwd *libc_getpwnam(const char *name)
 953 {
 954         nwrap_load_lib_function(NWRAP_LIBC, getpwnam);
 955
 956         return nwrap_main_global->libc->fns->_libc_getpwnam(name);
 957 }
 958
 959 #ifdef HAVE_GETPWNAM_R
 960 static int libc_getpwnam_r(const char *name,
 961                            struct passwd *pwd,
 962                            char *buf,
 963                            size_t buflen,
 964                            struct passwd **result)
 965 {
 966 #ifdef HAVE___POSIX_GETPWNAM_R
 967         if (nwrap_main_global->libc->fns->_libc_getpwnam_r == NULL) {
 968                 *(void **) (&nwrap_main_global->libc->fns->_libc_getpwnam_r) =
 969                         _nwrap_load_lib_function(NWRAP_LIBC, "__posix_getpwnam_r");
 970         }
 971 #else
 972         nwrap_load_lib_function(NWRAP_LIBC, getpwnam_r);
 973 #endif
 974
 975         return nwrap_main_global->libc->fns->_libc_getpwnam_r(name,
 976                                                               pwd,
 977                                                               buf,
 978                                                               buflen,
 979                                                               result);
 980 }
 981 #endif
 982
 983 static struct passwd *libc_getpwuid(uid_t uid)
 984 {
 985         nwrap_load_lib_function(NWRAP_LIBC, getpwuid);
 986
 987         return nwrap_main_global->libc->fns->_libc_getpwuid(uid);
 988 }
 989
 990 #ifdef HAVE_GETPWUID_R
 991 static int libc_getpwuid_r(uid_t uid,
 992                            struct passwd *pwd,
 993                            char *buf,
 994                            size_t buflen,
 995                            struct passwd **result)
 996 {
 997 #ifdef HAVE___POSIX_GETPWUID_R
 998         if (nwrap_main_global->libc->fns->_libc_getpwuid_r == NULL) {
 999                 *(void **) (&nwrap_main_global->libc->fns->_libc_getpwuid_r) =
1000                         _nwrap_load_lib_function(NWRAP_LIBC, "__posix_getpwuid_r");
1001         }
1002 #else
1003         nwrap_load_lib_function(NWRAP_LIBC, getpwuid_r);
1004 #endif
1005
1006         return nwrap_main_global->libc->fns->_libc_getpwuid_r(uid,
1007                                                               pwd,
1008                                                               buf,
1009                                                               buflen,
1010                                                               result);
1011 }
1012 #endif
1013
1014 static inline void str_tolower(char *dst, char *src)
1015 {
1016         register char *src_tmp = src;
1017         register char *dst_tmp = dst;
1018
1019         while (*src_tmp != '\0') {
1020                 *dst_tmp = tolower(*src_tmp);
1021                 ++src_tmp;
1022                 ++dst_tmp;
1023         }
1024 }
1025
1026 static bool str_tolower_copy(char **dst_name, const char *const src_name)
1027 {
1028         char *h_name_lower;
1029
1030         if ((dst_name == NULL) || (src_name == NULL)) {
1031                 return false;
1032         }
1033
1034         h_name_lower = strdup(src_name);
1035         if (h_name_lower == NULL) {
1036                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Out of memory while strdup");
1037                 return false;
1038         }
1039
1040         str_tolower(h_name_lower, h_name_lower);
1041         *dst_name = h_name_lower;
1042         return true;
1043 }
1044
1045 static void libc_setpwent(void)
1046 {
1047         nwrap_load_lib_function(NWRAP_LIBC, setpwent);
1048
1049         nwrap_main_global->libc->fns->_libc_setpwent();
1050 }
1051
1052 static struct passwd *libc_getpwent(void)
1053 {
1054         nwrap_load_lib_function(NWRAP_LIBC, getpwent);
1055
1056         return nwrap_main_global->libc->fns->_libc_getpwent();
1057 }
1058
1059 #ifdef HAVE_SOLARIS_GETPWENT_R
1060 static struct passwd *libc_getpwent_r(struct passwd *pwdst,
1061                                       char *buf,
1062                                       int buflen)
1063 {
1064         nwrap_load_lib_function(NWRAP_LIBC, getpwent_r);
1065
1066         return nwrap_main_global->libc->fns->_libc_getpwent_r(pwdst,
1067                                                               buf,
1068                                                               buflen);
1069 }
1070 #else /* HAVE_SOLARIS_GETPWENT_R */
1071 static int libc_getpwent_r(struct passwd *pwdst,
1072                            char *buf,
1073                            size_t buflen,
1074                            struct passwd **pwdstp)
1075 {
1076         nwrap_load_lib_function(NWRAP_LIBC, getpwent_r);
1077
1078         return nwrap_main_global->libc->fns->_libc_getpwent_r(pwdst,
1079                                                               buf,
1080                                                               buflen,
1081                                                               pwdstp);
1082 }
1083 #endif /* HAVE_SOLARIS_GETPWENT_R */
1084
1085 static void libc_endpwent(void)
1086 {
1087         nwrap_load_lib_function(NWRAP_LIBC, endpwent);
1088
1089         nwrap_main_global->libc->fns->_libc_endpwent();
1090 }
1091
1092 static int libc_initgroups(const char *user, gid_t gid)
1093 {
1094         nwrap_load_lib_function(NWRAP_LIBC, initgroups);
1095
1096         return nwrap_main_global->libc->fns->_libc_initgroups(user, gid);
1097 }
1098
1099 static struct group *libc_getgrnam(const char *name)
1100 {
1101         nwrap_load_lib_function(NWRAP_LIBC, getgrnam);
1102
1103         return nwrap_main_global->libc->fns->_libc_getgrnam(name);
1104 }
1105
1106 #ifdef HAVE_GETGRNAM_R
1107 static int libc_getgrnam_r(const char *name,
1108                            struct group *grp,
1109                            char *buf,
1110                            size_t buflen,
1111                            struct group **result)
1112 {
1113 #ifdef HAVE___POSIX_GETGRNAM_R
1114         if (nwrap_main_global->libc->fns->_libc_getgrnam_r == NULL) {
1115                 *(void **) (&nwrap_main_global->libc->fns->_libc_getgrnam_r) =
1116                         _nwrap_load_lib_function(NWRAP_LIBC, "__posix_getgrnam_r");
1117         }
1118 #else
1119         nwrap_load_lib_function(NWRAP_LIBC, getgrnam_r);
1120 #endif
1121
1122         return nwrap_main_global->libc->fns->_libc_getgrnam_r(name,
1123                                                               grp,
1124                                                               buf,
1125                                                               buflen,
1126                                                               result);
1127 }
1128 #endif
1129
1130 static struct group *libc_getgrgid(gid_t gid)
1131 {
1132         nwrap_load_lib_function(NWRAP_LIBC, getgrgid);
1133
1134         return nwrap_main_global->libc->fns->_libc_getgrgid(gid);
1135 }
1136
1137 #ifdef HAVE_GETGRGID_R
1138 static int libc_getgrgid_r(gid_t gid,
1139                            struct group *grp,
1140                            char *buf,
1141                            size_t buflen,
1142                            struct group **result)
1143 {
1144 #ifdef HAVE___POSIX_GETGRGID_R
1145         if (nwrap_main_global->libc->fns->_libc_getgrgid_r == NULL) {
1146                 *(void **) (&nwrap_main_global->libc->fns->_libc_getgrgid_r) =
1147                         _nwrap_load_lib_function(NWRAP_LIBC, "__posix_getgrgid_r");
1148         }
1149 #else
1150         nwrap_load_lib_function(NWRAP_LIBC, getgrgid_r);
1151 #endif
1152
1153         return nwrap_main_global->libc->fns->_libc_getgrgid_r(gid,
1154                                                               grp,
1155                                                               buf,
1156                                                               buflen,
1157                                                               result);
1158 }
1159 #endif
1160
1161 static void libc_setgrent(void)
1162 {
1163         nwrap_load_lib_function(NWRAP_LIBC, setgrent);
1164
1165         nwrap_main_global->libc->fns->_libc_setgrent();
1166 }
1167
1168 static struct group *libc_getgrent(void)
1169 {
1170         nwrap_load_lib_function(NWRAP_LIBC, getgrent);
1171
1172         return nwrap_main_global->libc->fns->_libc_getgrent();
1173 }
1174
1175 #ifdef HAVE_GETGRENT_R
1176 #ifdef HAVE_SOLARIS_GETGRENT_R
1177 static struct group *libc_getgrent_r(struct group *group,
1178                                      char *buf,
1179                                      size_t buflen)
1180 {
1181         nwrap_load_lib_function(NWRAP_LIBC, getgrent_r);
1182
1183         return nwrap_main_global->libc->fns->_libc_getgrent_r(group,
1184                                                               buf,
1185                                                               buflen);
1186 }
1187 #else /* !HAVE_SOLARIS_GETGRENT_R */
1188 static int libc_getgrent_r(struct group *group,
1189                            char *buf,
1190                            size_t buflen,
1191                            struct group **result)
1192 {
1193         nwrap_load_lib_function(NWRAP_LIBC, getgrent_r);
1194
1195         return nwrap_main_global->libc->fns->_libc_getgrent_r(group,
1196                                                               buf,
1197                                                               buflen,
1198                                                               result);
1199 }
1200 #endif /* HAVE_SOLARIS_GETGRENT_R */
1201 #endif /* HAVE_GETGRENT_R */
1202
1203 static void libc_endgrent(void)
1204 {
1205         nwrap_load_lib_function(NWRAP_LIBC, endgrent);
1206
1207         nwrap_main_global->libc->fns->_libc_endgrent();
1208 }
1209
1210 #ifdef HAVE_GETGROUPLIST
1211 static int libc_getgrouplist(const char *user,
1212                              gid_t group,
1213                              gid_t *groups,
1214                              int *ngroups)
1215 {
1216         nwrap_load_lib_function(NWRAP_LIBC, getgrouplist);
1217
1218         return nwrap_main_global->libc->fns->_libc_getgrouplist(user,
1219                                                                 group,
1220                                                                 groups,
1221                                                                 ngroups);
1222 }
1223 #endif
1224
1225 static void libc_sethostent(int stayopen)
1226 {
1227         nwrap_load_lib_function(NWRAP_LIBNSL, sethostent);
1228
1229         nwrap_main_global->libc->fns->_libc_sethostent(stayopen);
1230 }
1231
1232 static struct hostent *libc_gethostent(void)
1233 {
1234         nwrap_load_lib_function(NWRAP_LIBNSL, gethostent);
1235
1236         return nwrap_main_global->libc->fns->_libc_gethostent();
1237 }
1238
1239 static void libc_endhostent(void)
1240 {
1241         nwrap_load_lib_function(NWRAP_LIBNSL, endhostent);
1242
1243         nwrap_main_global->libc->fns->_libc_endhostent();
1244 }
1245
1246 static struct hostent *libc_gethostbyname(const char *name)
1247 {
1248         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyname);
1249
1250         return nwrap_main_global->libc->fns->_libc_gethostbyname(name);
1251 }
1252
1253 #ifdef HAVE_GETHOSTBYNAME2 /* GNU extension */
1254 static struct hostent *libc_gethostbyname2(const char *name, int af)
1255 {
1256         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyname2);
1257
1258         return nwrap_main_global->libc->fns->_libc_gethostbyname2(name, af);
1259 }
1260 #endif
1261
1262 static struct hostent *libc_gethostbyaddr(const void *addr,
1263                                           socklen_t len,
1264                                           int type)
1265 {
1266         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyaddr);
1267
1268         return nwrap_main_global->libc->fns->_libc_gethostbyaddr(addr,
1269                                                                  len,
1270                                                                  type);
1271 }
1272
1273 static int libc_gethostname(char *name, size_t len)
1274 {
1275         nwrap_load_lib_function(NWRAP_LIBNSL, gethostname);
1276
1277         return nwrap_main_global->libc->fns->_libc_gethostname(name, len);
1278 }
1279
1280 #ifdef HAVE_GETHOSTBYNAME_R
1281 static int libc_gethostbyname_r(const char *name,
1282                                 struct hostent *ret,
1283                                 char *buf,
1284                                 size_t buflen,
1285                                 struct hostent **result,
1286                                 int *h_errnop)
1287 {
1288         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyname_r);
1289
1290         return nwrap_main_global->libc->fns->_libc_gethostbyname_r(name,
1291                                                                    ret,
1292                                                                    buf,
1293                                                                    buflen,
1294                                                                    result,
1295                                                                    h_errnop);
1296 }
1297 #endif
1298
1299 #ifdef HAVE_GETHOSTBYADDR_R
1300 static int libc_gethostbyaddr_r(const void *addr,
1301                                 socklen_t len,
1302                                 int type,
1303                                 struct hostent *ret,
1304                                 char *buf,
1305                                 size_t buflen,
1306                                 struct hostent **result,
1307                                 int *h_errnop)
1308 {
1309         nwrap_load_lib_function(NWRAP_LIBNSL, gethostbyaddr_r);
1310
1311         return nwrap_main_global->libc->fns->_libc_gethostbyaddr_r(addr,
1312                                                                    len,
1313                                                                    type,
1314                                                                    ret,
1315                                                                    buf,
1316                                                                    buflen,
1317                                                                    result,
1318                                                                    h_errnop);
1319 }
1320 #endif
1321
1322 static int libc_getaddrinfo(const char *node,
1323                             const char *service,
1324                             const struct addrinfo *hints,
1325                             struct addrinfo **res)
1326 {
1327         nwrap_load_lib_function(NWRAP_LIBSOCKET, getaddrinfo);
1328
1329         return nwrap_main_global->libc->fns->_libc_getaddrinfo(node,
1330                                                                service,
1331                                                                hints,
1332                                                                res);
1333 }
1334
1335 static int libc_getnameinfo(const struct sockaddr *sa,
1336                             socklen_t salen,
1337                             char *host,
1338                             size_t hostlen,
1339                             char *serv,
1340                             size_t servlen,
1341                             int flags)
1342 {
1343         nwrap_load_lib_function(NWRAP_LIBSOCKET, getnameinfo);
1344
1345         return nwrap_main_global->libc->fns->_libc_getnameinfo(sa,
1346                                                                salen,
1347                                                                host,
1348                                                                hostlen,
1349                                                                serv,
1350                                                                servlen,
1351                                                                flags);
1352 }
1353
1354 /*********************************************************
1355  * NWRAP NSS MODULE LOADER FUNCTIONS
1356  *********************************************************/
1357
1358 static void *nwrap_load_module_fn(struct nwrap_backend *b,
1359                                   const char *fn_name)
1360 {
1361         void *res;
1362         char *s;
1363
1364         if (!b->so_handle) {
1365                 NWRAP_LOG(NWRAP_LOG_ERROR, "No handle");
1366                 return NULL;
1367         }
1368
1369         if (asprintf(&s, "_nss_%s_%s", b->name, fn_name) == -1) {
1370                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
1371                 return NULL;
1372         }
1373
1374         res = dlsym(b->so_handle, s);
1375         if (!res) {
1376                 NWRAP_LOG(NWRAP_LOG_ERROR,
1377                           "Cannot find function %s in %s",
1378                           s, b->so_path);
1379         }
1380         SAFE_FREE(s);
1381         return res;
1382 }
1383
1384 static struct nwrap_module_nss_fns *nwrap_load_module_fns(struct nwrap_backend *b)
1385 {
1386         struct nwrap_module_nss_fns *fns;
1387
1388         if (!b->so_handle) {
1389                 return NULL;
1390         }
1391
1392         fns = (struct nwrap_module_nss_fns *)malloc(sizeof(struct nwrap_module_nss_fns));
1393         if (!fns) {
1394                 return NULL;
1395         }
1396
1397         *(void **)(&fns->_nss_getpwnam_r) =
1398                 nwrap_load_module_fn(b, "getpwnam_r");
1399         *(void **)(&fns->_nss_getpwuid_r) =
1400                 nwrap_load_module_fn(b, "getpwuid_r");
1401         *(void **)(&fns->_nss_setpwent) =
1402                 nwrap_load_module_fn(b, "setpwent");
1403         *(void **)(&fns->_nss_getpwent_r) =
1404                 nwrap_load_module_fn(b, "getpwent_r");
1405         *(void **)(&fns->_nss_endpwent) =
1406                 nwrap_load_module_fn(b, "endpwent");
1407         *(void **)(&fns->_nss_initgroups) =
1408                 nwrap_load_module_fn(b, "initgroups_dyn");
1409         *(void **)(&fns->_nss_getgrnam_r) =
1410                 nwrap_load_module_fn(b, "getgrnam_r");
1411         *(void **)(&fns->_nss_getgrgid_r)=
1412                 nwrap_load_module_fn(b, "getgrgid_r");
1413         *(void **)(&fns->_nss_setgrent) =
1414                 nwrap_load_module_fn(b, "setgrent");
1415         *(void **)(&fns->_nss_getgrent_r) =
1416                 nwrap_load_module_fn(b, "getgrent_r");
1417         *(void **)(&fns->_nss_endgrent) =
1418                 nwrap_load_module_fn(b, "endgrent");
1419
1420         return fns;
1421 }
1422
1423 static void *nwrap_load_module(const char *so_path)
1424 {
1425         void *h;
1426
1427         if (!so_path || !strlen(so_path)) {
1428                 return NULL;
1429         }
1430
1431         h = dlopen(so_path, RTLD_LAZY);
1432         if (!h) {
1433                 NWRAP_LOG(NWRAP_LOG_ERROR,
1434                           "Cannot open shared library %s",
1435                           so_path);
1436                 return NULL;
1437         }
1438
1439         return h;
1440 }
1441
1442 static bool nwrap_module_init(const char *name,
1443                               struct nwrap_ops *ops,
1444                               const char *so_path,
1445                               int *num_backends,
1446                               struct nwrap_backend **backends)
1447 {
1448         struct nwrap_backend *b;
1449
1450         *backends = (struct nwrap_backend *)realloc(*backends,
1451                 sizeof(struct nwrap_backend) * ((*num_backends) + 1));
1452         if (!*backends) {
1453                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
1454                 return false;
1455         }
1456
1457         b = &((*backends)[*num_backends]);
1458
1459         b->name = name;
1460         b->ops = ops;
1461         b->so_path = so_path;
1462
1463         if (so_path != NULL) {
1464                 b->so_handle = nwrap_load_module(so_path);
1465                 b->fns = nwrap_load_module_fns(b);
1466                 if (b->fns == NULL) {
1467                         return false;
1468                 }
1469         } else {
1470                 b->so_handle = NULL;
1471                 b->fns = NULL;
1472         }
1473
1474         (*num_backends)++;
1475
1476         return true;
1477 }
1478
1479 static void nwrap_libc_init(struct nwrap_main *r)
1480 {
1481         r->libc = malloc(sizeof(struct nwrap_libc));
1482         if (r->libc == NULL) {
1483                 printf("Failed to allocate memory for libc");
1484                 exit(-1);
1485         }
1486         ZERO_STRUCTP(r->libc);
1487
1488         r->libc->fns = malloc(sizeof(struct nwrap_libc_fns));
1489         if (r->libc->fns == NULL) {
1490                 printf("Failed to allocate memory for libc functions");
1491                 exit(-1);
1492         }
1493         ZERO_STRUCTP(r->libc->fns);
1494 }
1495
1496 static void nwrap_backend_init(struct nwrap_main *r)
1497 {
1498         const char *module_so_path = getenv("NSS_WRAPPER_MODULE_SO_PATH");
1499         const char *module_fn_name = getenv("NSS_WRAPPER_MODULE_FN_PREFIX");
1500
1501         r->num_backends = 0;
1502         r->backends = NULL;
1503
1504         if (!nwrap_module_init("files", &nwrap_files_ops, NULL,
1505                                &r->num_backends,
1506                                &r->backends)) {
1507                 NWRAP_LOG(NWRAP_LOG_ERROR,
1508                           "Failed to initialize 'files' backend");
1509                 return;
1510         }
1511
1512         if (module_so_path != NULL &&
1513             module_so_path[0] != '\0' &&
1514             module_fn_name != NULL &&
1515             module_fn_name[0] != '\0') {
1516                 if (!nwrap_module_init(module_fn_name,
1517                                        &nwrap_module_ops,
1518                                        module_so_path,
1519                                        &r->num_backends,
1520                                        &r->backends)) {
1521                         NWRAP_LOG(NWRAP_LOG_ERROR,
1522                                   "Failed to initialize '%s' backend",
1523                                   module_fn_name);
1524                         return;
1525                 }
1526         }
1527 }
1528
1529 static void nwrap_init(void)
1530 {
1531         const char *env;
1532         char *endptr;
1533         size_t max_hostents_tmp;
1534
1535         NWRAP_LOCK(nwrap_initialized);
1536         if (nwrap_initialized) {
1537                 NWRAP_UNLOCK(nwrap_initialized);
1538                 return;
1539         }
1540
1541         /*
1542          * Still holding nwrap_initialized lock here.
1543          * We don't use NWRAP_(UN)LOCK_ALL macros here because we
1544          * want to avoid overhead when other threads do their job.
1545          */
1546         NWRAP_LOCK(nwrap_global);
1547         NWRAP_LOCK(nwrap_gr_global);
1548         NWRAP_LOCK(nwrap_he_global);
1549         NWRAP_LOCK(nwrap_pw_global);
1550         NWRAP_LOCK(nwrap_sp_global);
1551
1552         nwrap_initialized = true;
1553
1554         /* Initialize pthread_atfork handlers */
1555         pthread_atfork(&nwrap_thread_prepare, &nwrap_thread_parent,
1556                        &nwrap_thread_child);
1557
1558         env = getenv("NSS_WRAPPER_MAX_HOSTENTS");
1559         if (env != NULL) {
1560                 max_hostents_tmp = (size_t)strtol(env, &endptr, 10);
1561                 if (((env != '\0') && (endptr == '\0')) ||
1562                     (max_hostents_tmp == 0)) {
1563                         NWRAP_LOG(NWRAP_LOG_DEBUG,
1564                                   "Error parsing NSS_WRAPPER_MAX_HOSTENTS "
1565                                   "value or value is too small. "
1566                                   "Using default value: %lu.",
1567                                   max_hostents);
1568                 } else {
1569                         max_hostents = max_hostents_tmp;
1570                 }
1571         }
1572         /* Initialize hash table */
1573         NWRAP_LOG(NWRAP_LOG_DEBUG,
1574                   "Initializing hash table of size %lu items.", max_hostents);
1575         if (hcreate(max_hostents) == 0) {
1576                 NWRAP_LOG(NWRAP_LOG_ERROR,
1577                           "Failed to initialize hash table");
1578                 goto done;
1579         }
1580
1581         nwrap_main_global = &__nwrap_main_global;
1582
1583         nwrap_libc_init(nwrap_main_global);
1584
1585         nwrap_backend_init(nwrap_main_global);
1586
1587         /* passwd */
1588         nwrap_pw_global.cache = &__nwrap_cache_pw;
1589
1590         nwrap_pw_global.cache->path = getenv("NSS_WRAPPER_PASSWD");
1591         nwrap_pw_global.cache->fp = NULL;
1592         nwrap_pw_global.cache->fd = -1;
1593         nwrap_pw_global.cache->private_data = &nwrap_pw_global;
1594         nwrap_pw_global.cache->parse_line = nwrap_pw_parse_line;
1595         nwrap_pw_global.cache->unload = nwrap_pw_unload;
1596
1597         /* shadow */
1598 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
1599         nwrap_sp_global.cache = &__nwrap_cache_sp;
1600
1601         nwrap_sp_global.cache->path = getenv("NSS_WRAPPER_SHADOW");
1602         nwrap_sp_global.cache->fp = NULL;
1603         nwrap_sp_global.cache->fd = -1;
1604         nwrap_sp_global.cache->private_data = &nwrap_sp_global;
1605         nwrap_sp_global.cache->parse_line = nwrap_sp_parse_line;
1606         nwrap_sp_global.cache->unload = nwrap_sp_unload;
1607 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
1608
1609         /* group */
1610         nwrap_gr_global.cache = &__nwrap_cache_gr;
1611
1612         nwrap_gr_global.cache->path = getenv("NSS_WRAPPER_GROUP");
1613         nwrap_gr_global.cache->fp = NULL;
1614         nwrap_gr_global.cache->fd = -1;
1615         nwrap_gr_global.cache->private_data = &nwrap_gr_global;
1616         nwrap_gr_global.cache->parse_line = nwrap_gr_parse_line;
1617         nwrap_gr_global.cache->unload = nwrap_gr_unload;
1618
1619         /* hosts */
1620         nwrap_he_global.cache = &__nwrap_cache_he;
1621
1622         nwrap_he_global.cache->path = getenv("NSS_WRAPPER_HOSTS");
1623         nwrap_he_global.cache->fp = NULL;
1624         nwrap_he_global.cache->fd = -1;
1625         nwrap_he_global.cache->private_data = &nwrap_he_global;
1626         nwrap_he_global.cache->parse_line = nwrap_he_parse_line;
1627         nwrap_he_global.cache->unload = nwrap_he_unload;
1628
1629 done:
1630         /* We hold all locks here so we can use NWRAP_UNLOCK_ALL. */
1631         NWRAP_UNLOCK_ALL;
1632 }
1633
1634 bool nss_wrapper_enabled(void)
1635 {
1636         nwrap_init();
1637
1638         if (nwrap_pw_global.cache->path == NULL ||
1639             nwrap_pw_global.cache->path[0] == '\0') {
1640                 return false;
1641         }
1642         if (nwrap_gr_global.cache->path == NULL ||
1643             nwrap_gr_global.cache->path[0] == '\0') {
1644                 return false;
1645         }
1646
1647         return true;
1648 }
1649
1650 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
1651 bool nss_wrapper_shadow_enabled(void)
1652 {
1653         nwrap_init();
1654
1655         if (nwrap_sp_global.cache->path == NULL ||
1656             nwrap_sp_global.cache->path[0] == '\0') {
1657                 return false;
1658         }
1659
1660         return true;
1661 }
1662 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
1663
1664 bool nss_wrapper_hosts_enabled(void)
1665 {
1666         nwrap_init();
1667
1668         if (nwrap_he_global.cache->path == NULL ||
1669             nwrap_he_global.cache->path[0] == '\0') {
1670                 return false;
1671         }
1672
1673         return true;
1674 }
1675
1676 static bool nwrap_hostname_enabled(void)
1677 {
1678         nwrap_init();
1679
1680         if (getenv("NSS_WRAPPER_HOSTNAME") == NULL) {
1681                 return false;
1682         }
1683
1684         return true;
1685 }
1686
1687 static bool nwrap_parse_file(struct nwrap_cache *nwrap)
1688 {
1689         char *line = NULL;
1690         ssize_t n;
1691         /* Unused but getline needs it */
1692         size_t len;
1693         bool ok;
1694
1695         if (nwrap->st.st_size == 0) {
1696                 NWRAP_LOG(NWRAP_LOG_DEBUG, "size == 0");
1697                 return true;
1698         }
1699
1700         /* Support for 32-bit system I guess */
1701         if (nwrap->st.st_size > INT32_MAX) {
1702                 NWRAP_LOG(NWRAP_LOG_ERROR,
1703                           "Size[%u] larger than INT32_MAX",
1704                           (unsigned)nwrap->st.st_size);
1705                 return false;
1706         }
1707
1708         rewind(nwrap->fp);
1709
1710         do {
1711                 n = getline(&line, &len, nwrap->fp);
1712                 if (n < 0) {
1713                         SAFE_FREE(line);
1714                         if (feof(nwrap->fp)) {
1715                                 break;
1716                         }
1717
1718                         NWRAP_LOG(NWRAP_LOG_ERROR,
1719                                   "Unable to read line from file: %s",
1720                                   nwrap->path);
1721                         return false;
1722                 }
1723
1724                 if (line[n - 1] == '\n') {
1725                         line[n - 1] = '\0';
1726                 }
1727
1728                 if (line[0] == '\0') {
1729                         SAFE_FREE(line);
1730                         continue;
1731                 }
1732
1733                 ok = nwrap->parse_line(nwrap, line);
1734                 if (!ok) {
1735                         NWRAP_LOG(NWRAP_LOG_ERROR,
1736                                   "Unable to parse line file: %s",
1737                                   line);
1738                         SAFE_FREE(line);
1739                         return false;
1740                 }
1741
1742                 /* Line is parsed without issues so add it to list */
1743                 ok = nwrap_vector_add_item(&(nwrap->lines), (void *const) line);
1744                 if (!ok) {
1745                         NWRAP_LOG(NWRAP_LOG_ERROR,
1746                                   "Unable to add line to vector");
1747                         return false;
1748                 }
1749
1750                 /* This forces getline to allocate new memory for line. */
1751                 line = NULL;
1752         } while (!feof(nwrap->fp));
1753
1754         return true;
1755 }
1756
1757 static void nwrap_files_cache_unload(struct nwrap_cache *nwrap)
1758 {
1759         nwrap->unload(nwrap);
1760
1761         nwrap_lines_unload(nwrap);
1762 }
1763
1764 static void nwrap_files_cache_reload(struct nwrap_cache *nwrap)
1765 {
1766         struct stat st;
1767         int ret;
1768         bool ok;
1769         bool retried = false;
1770
1771         assert(nwrap != NULL);
1772
1773 reopen:
1774         if (nwrap->fd < 0) {
1775                 nwrap->fp = fopen(nwrap->path, "re");
1776                 if (nwrap->fp == NULL) {
1777                         nwrap->fd = -1;
1778                         NWRAP_LOG(NWRAP_LOG_ERROR,
1779                                   "Unable to open '%s' readonly %d:%s",
1780                                   nwrap->path, nwrap->fd,
1781                                   strerror(errno));
1782                         return;
1783
1784                 }
1785                 nwrap->fd = fileno(nwrap->fp);
1786                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Open '%s'", nwrap->path);
1787         }
1788
1789         ret = fstat(nwrap->fd, &st);
1790         if (ret != 0) {
1791                 NWRAP_LOG(NWRAP_LOG_ERROR,
1792                           "fstat(%s) - %d:%s",
1793                           nwrap->path,
1794                           ret,
1795                           strerror(errno));
1796                 fclose(nwrap->fp);
1797                 nwrap->fp = NULL;
1798                 nwrap->fd = -1;
1799                 return;
1800         }
1801
1802         if (retried == false && st.st_nlink == 0) {
1803                 /* maybe someone has replaced the file... */
1804                 NWRAP_LOG(NWRAP_LOG_TRACE,
1805                           "st_nlink == 0, reopen %s",
1806                           nwrap->path);
1807                 retried = true;
1808                 memset(&nwrap->st, 0, sizeof(nwrap->st));
1809                 fclose(nwrap->fp);
1810                 nwrap->fp = NULL;
1811                 nwrap->fd = -1;
1812                 goto reopen;
1813         }
1814
1815         if (st.st_mtime == nwrap->st.st_mtime) {
1816                 NWRAP_LOG(NWRAP_LOG_TRACE,
1817                           "st_mtime[%u] hasn't changed, skip reload",
1818                           (unsigned)st.st_mtime);
1819                 return;
1820         }
1821
1822         NWRAP_LOG(NWRAP_LOG_TRACE,
1823                   "st_mtime has changed [%u] => [%u], start reload",
1824                   (unsigned)st.st_mtime,
1825                   (unsigned)nwrap->st.st_mtime);
1826
1827         nwrap->st = st;
1828
1829         nwrap_files_cache_unload(nwrap);
1830
1831         ok = nwrap_parse_file(nwrap);
1832         if (!ok) {
1833                 NWRAP_LOG(NWRAP_LOG_ERROR, "Failed to reload %s", nwrap->path);
1834                 nwrap_files_cache_unload(nwrap);
1835         }
1836
1837         NWRAP_LOG(NWRAP_LOG_TRACE, "Reloaded %s", nwrap->path);
1838 }
1839
1840 /*
1841  * the caller has to call nwrap_unload() on failure
1842  */
1843 static bool nwrap_pw_parse_line(struct nwrap_cache *nwrap, char *line)
1844 {
1845         struct nwrap_pw *nwrap_pw;
1846         char *c;
1847         char *p;
1848         char *e;
1849         struct passwd *pw;
1850         size_t list_size;
1851
1852         nwrap_pw = (struct nwrap_pw *)nwrap->private_data;
1853
1854         list_size = sizeof(*nwrap_pw->list) * (nwrap_pw->num+1);
1855         pw = (struct passwd *)realloc(nwrap_pw->list, list_size);
1856         if (!pw) {
1857                 NWRAP_LOG(NWRAP_LOG_ERROR,
1858                           "realloc(%u) failed",
1859                           (unsigned)list_size);
1860                 return false;
1861         }
1862         nwrap_pw->list = pw;
1863
1864         pw = &nwrap_pw->list[nwrap_pw->num];
1865
1866         c = line;
1867
1868         /* name */
1869         p = strchr(c, ':');
1870         if (!p) {
1871                 NWRAP_LOG(NWRAP_LOG_ERROR,
1872                           "Invalid line[%s]: '%s'",
1873                           line,
1874                           c);
1875                 return false;
1876         }
1877         *p = '\0';
1878         p++;
1879         pw->pw_name = c;
1880         c = p;
1881
1882         NWRAP_LOG(NWRAP_LOG_TRACE, "name[%s]\n", pw->pw_name);
1883
1884         /* password */
1885         p = strchr(c, ':');
1886         if (!p) {
1887                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
1888                 return false;
1889         }
1890         *p = '\0';
1891         p++;
1892         pw->pw_passwd = c;
1893         c = p;
1894
1895         NWRAP_LOG(NWRAP_LOG_TRACE, "password[%s]\n", pw->pw_passwd);
1896
1897         /* uid */
1898         p = strchr(c, ':');
1899         if (!p) {
1900                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
1901                 return false;
1902         }
1903         *p = '\0';
1904         p++;
1905         e = NULL;
1906         pw->pw_uid = (uid_t)strtoul(c, &e, 10);
1907         if (c == e) {
1908                 NWRAP_LOG(NWRAP_LOG_ERROR,
1909                           "Invalid line[%s]: '%s' - %s",
1910                           line, c, strerror(errno));
1911                 return false;
1912         }
1913         if (e == NULL) {
1914                 NWRAP_LOG(NWRAP_LOG_ERROR,
1915                           "Invalid line[%s]: '%s' - %s",
1916                           line, c, strerror(errno));
1917                 return false;
1918         }
1919         if (e[0] != '\0') {
1920                 NWRAP_LOG(NWRAP_LOG_ERROR,
1921                           "Invalid line[%s]: '%s' - %s",
1922                           line, c, strerror(errno));
1923                 return false;
1924         }
1925         c = p;
1926
1927         NWRAP_LOG(NWRAP_LOG_TRACE, "uid[%u]", pw->pw_uid);
1928
1929         /* gid */
1930         p = strchr(c, ':');
1931         if (!p) {
1932                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
1933                 return false;
1934         }
1935         *p = '\0';
1936         p++;
1937         e = NULL;
1938         pw->pw_gid = (gid_t)strtoul(c, &e, 10);
1939         if (c == e) {
1940                 NWRAP_LOG(NWRAP_LOG_ERROR,
1941                           "Invalid line[%s]: '%s' - %s",
1942                           line, c, strerror(errno));
1943                 return false;
1944         }
1945         if (e == NULL) {
1946                 NWRAP_LOG(NWRAP_LOG_ERROR,
1947                           "Invalid line[%s]: '%s' - %s",
1948                           line, c, strerror(errno));
1949                 return false;
1950         }
1951         if (e[0] != '\0') {
1952                 NWRAP_LOG(NWRAP_LOG_ERROR,
1953                           "Invalid line[%s]: '%s' - %s",
1954                           line, c, strerror(errno));
1955                 return false;
1956         }
1957         c = p;
1958
1959         NWRAP_LOG(NWRAP_LOG_TRACE, "gid[%u]\n", pw->pw_gid);
1960
1961         /* gecos */
1962         p = strchr(c, ':');
1963         if (!p) {
1964                 NWRAP_LOG(NWRAP_LOG_ERROR, "invalid line[%s]: '%s'", line, c);
1965                 return false;
1966         }
1967         *p = '\0';
1968         p++;
1969         pw->pw_gecos = c;
1970         c = p;
1971
1972         NWRAP_LOG(NWRAP_LOG_TRACE, "gecos[%s]", pw->pw_gecos);
1973
1974         /* dir */
1975         p = strchr(c, ':');
1976         if (!p) {
1977                 NWRAP_LOG(NWRAP_LOG_ERROR, "'%s'", c);
1978                 return false;
1979         }
1980         *p = '\0';
1981         p++;
1982         pw->pw_dir = c;
1983         c = p;
1984
1985         NWRAP_LOG(NWRAP_LOG_TRACE, "dir[%s]", pw->pw_dir);
1986
1987         /* shell */
1988         pw->pw_shell = c;
1989         NWRAP_LOG(NWRAP_LOG_TRACE, "shell[%s]", pw->pw_shell);
1990
1991         NWRAP_LOG(NWRAP_LOG_DEBUG,
1992                   "Added user[%s:%s:%u:%u:%s:%s:%s]",
1993                   pw->pw_name, pw->pw_passwd,
1994                   pw->pw_uid, pw->pw_gid,
1995                   pw->pw_gecos, pw->pw_dir, pw->pw_shell);
1996
1997         nwrap_pw->num++;
1998         return true;
1999 }
2000
2001 static void nwrap_pw_unload(struct nwrap_cache *nwrap)
2002 {
2003         struct nwrap_pw *nwrap_pw;
2004         nwrap_pw = (struct nwrap_pw *)nwrap->private_data;
2005
2006         SAFE_FREE(nwrap_pw->list);
2007         nwrap_pw->num = 0;
2008         nwrap_pw->idx = 0;
2009 }
2010
2011 static int nwrap_pw_copy_r(const struct passwd *src, struct passwd *dst,
2012                            char *buf, size_t buflen, struct passwd **dstp)
2013 {
2014         char *first;
2015         char *last;
2016         off_t ofs;
2017
2018         first = src->pw_name;
2019
2020         last = src->pw_shell;
2021         while (*last) last++;
2022
2023         ofs = PTR_DIFF(last + 1, first);
2024
2025         if (ofs > (off_t) buflen) {
2026                 return ERANGE;
2027         }
2028
2029         memcpy(buf, first, ofs);
2030
2031         ofs = PTR_DIFF(src->pw_name, first);
2032         dst->pw_name = buf + ofs;
2033         ofs = PTR_DIFF(src->pw_passwd, first);
2034         dst->pw_passwd = buf + ofs;
2035         dst->pw_uid = src->pw_uid;
2036         dst->pw_gid = src->pw_gid;
2037         ofs = PTR_DIFF(src->pw_gecos, first);
2038         dst->pw_gecos = buf + ofs;
2039         ofs = PTR_DIFF(src->pw_dir, first);
2040         dst->pw_dir = buf + ofs;
2041         ofs = PTR_DIFF(src->pw_shell, first);
2042         dst->pw_shell = buf + ofs;
2043
2044         if (dstp) {
2045                 *dstp = dst;
2046         }
2047
2048         return 0;
2049 }
2050
2051 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
2052 static bool nwrap_sp_parse_line(struct nwrap_cache *nwrap, char *line)
2053 {
2054         struct nwrap_sp *nwrap_sp;
2055         struct spwd *sp;
2056         size_t list_size;
2057         char *c;
2058         char *e;
2059         char *p;
2060
2061         nwrap_sp = (struct nwrap_sp *)nwrap->private_data;
2062
2063         list_size = sizeof(*nwrap_sp->list) * (nwrap_sp->num+1);
2064         sp = (struct spwd *)realloc(nwrap_sp->list, list_size);
2065         if (sp == NULL) {
2066                 NWRAP_LOG(NWRAP_LOG_ERROR,
2067                           "realloc(%u) failed",
2068                           (unsigned)list_size);
2069                 return false;
2070         }
2071         nwrap_sp->list = sp;
2072
2073         sp = &nwrap_sp->list[nwrap_sp->num];
2074
2075         c = line;
2076
2077         /* name */
2078         p = strchr(c, ':');
2079         if (p == NULL) {
2080                 NWRAP_LOG(NWRAP_LOG_ERROR,
2081                           "name -- Invalid line[%s]: '%s'",
2082                           line,
2083                           c);
2084                 return false;
2085         }
2086         *p = '\0';
2087         p++;
2088         sp->sp_namp = c;
2089         c = p;
2090
2091         NWRAP_LOG(NWRAP_LOG_TRACE, "name[%s]\n", sp->sp_namp);
2092
2093         /* pwd */
2094         p = strchr(c, ':');
2095         if (p == NULL) {
2096                 NWRAP_LOG(NWRAP_LOG_ERROR,
2097                           "pwd -- Invalid line[%s]: '%s'",
2098                           line,
2099                           c);
2100                 return false;
2101         }
2102         *p = '\0';
2103         p++;
2104         sp->sp_pwdp = c;
2105         c = p;
2106
2107         /* lstchg (long) */
2108         if (c[0] == ':') {
2109                 sp->sp_lstchg = -1;
2110                 p++;
2111         } else {
2112                 p = strchr(c, ':');
2113                 if (p == NULL) {
2114                         NWRAP_LOG(NWRAP_LOG_ERROR,
2115                                   "lstchg -- Invalid line[%s]: '%s'",
2116                                   line,
2117                                   c);
2118                         return false;
2119                 }
2120                 *p = '\0';
2121                 p++;
2122                 sp->sp_lstchg = strtol(c, &e, 10);
2123                 if (c == e) {
2124                         NWRAP_LOG(NWRAP_LOG_ERROR,
2125                                   "lstchg -- Invalid line[%s]: '%s' - %s",
2126                                   line, c, strerror(errno));
2127                         return false;
2128                 }
2129                 if (e == NULL) {
2130                         NWRAP_LOG(NWRAP_LOG_ERROR,
2131                                   "lstchg -- Invalid line[%s]: '%s' - %s",
2132                                   line, c, strerror(errno));
2133                         return false;
2134                 }
2135                 if (e[0] != '\0') {
2136                         NWRAP_LOG(NWRAP_LOG_ERROR,
2137                                   "lstchg -- Invalid line[%s]: '%s' - %s",
2138                                   line, c, strerror(errno));
2139                         return false;
2140                 }
2141         }
2142         c = p;
2143
2144         /* min (long) */
2145         if (c[0] == ':') {
2146                 sp->sp_min = -1;
2147                 p++;
2148         } else {
2149                 p = strchr(c, ':');
2150                 if (p == NULL) {
2151                         NWRAP_LOG(NWRAP_LOG_ERROR,
2152                                   "min -- Invalid line[%s]: '%s'",
2153                                   line,
2154                                   c);
2155                         return false;
2156                 }
2157                 *p = '\0';
2158                 p++;
2159                 sp->sp_min = strtol(c, &e, 10);
2160                 if (c == e) {
2161                         NWRAP_LOG(NWRAP_LOG_ERROR,
2162                                   "min -- Invalid line[%s]: '%s' - %s",
2163                                   line, c, strerror(errno));
2164                         return false;
2165                 }
2166                 if (e == NULL) {
2167                         NWRAP_LOG(NWRAP_LOG_ERROR,
2168                                   "min -- Invalid line[%s]: '%s' - %s",
2169                                   line, c, strerror(errno));
2170                         return false;
2171                 }
2172                 if (e[0] != '\0') {
2173                         NWRAP_LOG(NWRAP_LOG_ERROR,
2174                                   "min -- Invalid line[%s]: '%s' - %s",
2175                                   line, c, strerror(errno));
2176                         return false;
2177                 }
2178         }
2179         c = p;
2180
2181         /* max (long) */
2182         if (c[0] == ':') {
2183                 sp->sp_max = -1;
2184                 p++;
2185         } else {
2186                 p = strchr(c, ':');
2187                 if (p == NULL) {
2188                         NWRAP_LOG(NWRAP_LOG_ERROR,
2189                                   "max -- Invalid line[%s]: '%s'",
2190                                   line,
2191                                   c);
2192                         return false;
2193                 }
2194                 *p = '\0';
2195                 p++;
2196                 sp->sp_max = strtol(c, &e, 10);
2197                 if (c == e) {
2198                         NWRAP_LOG(NWRAP_LOG_ERROR,
2199                                   "max -- Invalid line[%s]: '%s' - %s",
2200                                   line, c, strerror(errno));
2201                         return false;
2202                 }
2203                 if (e == NULL) {
2204                         NWRAP_LOG(NWRAP_LOG_ERROR,
2205                                   "max -- Invalid line[%s]: '%s' - %s",
2206                                   line, c, strerror(errno));
2207                         return false;
2208                 }
2209                 if (e[0] != '\0') {
2210                         NWRAP_LOG(NWRAP_LOG_ERROR,
2211                                   "max -- Invalid line[%s]: '%s' - %s",
2212                                   line, c, strerror(errno));
2213                         return false;
2214                 }
2215         }
2216         c = p;
2217
2218         /* warn (long) */
2219         if (c[0] == ':') {
2220                 sp->sp_warn = -1;
2221                 p++;
2222         } else {
2223                 p = strchr(c, ':');
2224                 if (p == NULL) {
2225                         NWRAP_LOG(NWRAP_LOG_ERROR,
2226                                   "warn -- Invalid line[%s]: '%s'",
2227                                   line,
2228                                   c);
2229                         return false;
2230                 }
2231                 *p = '\0';
2232                 p++;
2233                 sp->sp_warn = strtol(c, &e, 10);
2234                 if (c == e) {
2235                         NWRAP_LOG(NWRAP_LOG_ERROR,
2236                                   "warn -- Invalid line[%s]: '%s' - %s",
2237                                   line, c, strerror(errno));
2238                         return false;
2239                 }
2240                 if (e == NULL) {
2241                         NWRAP_LOG(NWRAP_LOG_ERROR,
2242                                   "warn -- Invalid line[%s]: '%s' - %s",
2243                                   line, c, strerror(errno));
2244                         return false;
2245                 }
2246                 if (e[0] != '\0') {
2247                         NWRAP_LOG(NWRAP_LOG_ERROR,
2248                                   "warn -- Invalid line[%s]: '%s' - %s",
2249                                   line, c, strerror(errno));
2250                         return false;
2251                 }
2252         }
2253         c = p;
2254
2255         /* inact (long) */
2256         if (c[0] == ':') {
2257                 sp->sp_inact = -1;
2258                 p++;
2259         } else {
2260                 p = strchr(c, ':');
2261                 if (p == NULL) {
2262                         NWRAP_LOG(NWRAP_LOG_ERROR,
2263                                   "inact -- Invalid line[%s]: '%s'",
2264                                   line,
2265                                   c);
2266                         return false;
2267                 }
2268                 *p = '\0';
2269                 p++;
2270                 sp->sp_inact = strtol(c, &e, 10);
2271                 if (c == e) {
2272                         NWRAP_LOG(NWRAP_LOG_ERROR,
2273                                   "inact -- Invalid line[%s]: '%s' - %s",
2274                                   line, c, strerror(errno));
2275                         return false;
2276                 }
2277                 if (e == NULL) {
2278                         NWRAP_LOG(NWRAP_LOG_ERROR,
2279                                   "inact -- Invalid line[%s]: '%s' - %s",
2280                                   line, c, strerror(errno));
2281                         return false;
2282                 }
2283                 if (e[0] != '\0') {
2284                         NWRAP_LOG(NWRAP_LOG_ERROR,
2285                                   "inact -- Invalid line[%s]: '%s' - %s",
2286                                   line, c, strerror(errno));
2287                         return false;
2288                 }
2289         }
2290         c = p;
2291
2292         /* expire (long) */
2293         if (c[0] == ':') {
2294                 sp->sp_expire = -1;
2295                 p++;
2296         } else {
2297                 p = strchr(c, ':');
2298                 if (p == NULL) {
2299                         NWRAP_LOG(NWRAP_LOG_ERROR,
2300                                   "expire -- Invalid line[%s]: '%s'",
2301                                   line,
2302                                   c);
2303                         return false;
2304                 }
2305                 *p = '\0';
2306                 p++;
2307                 sp->sp_expire = strtol(c, &e, 10);
2308                 if (c == e) {
2309                         NWRAP_LOG(NWRAP_LOG_ERROR,
2310                                   "expire -- Invalid line[%s]: '%s' - %s",
2311                                   line, c, strerror(errno));
2312                         return false;
2313                 }
2314                 if (e == NULL) {
2315                         NWRAP_LOG(NWRAP_LOG_ERROR,
2316                                   "expire -- Invalid line[%s]: '%s' - %s",
2317                                   line, c, strerror(errno));
2318                         return false;
2319                 }
2320                 if (e[0] != '\0') {
2321                         NWRAP_LOG(NWRAP_LOG_ERROR,
2322                                   "expire -- Invalid line[%s]: '%s' - %s",
2323                                   line, c, strerror(errno));
2324                         return false;
2325                 }
2326         }
2327         c = p;
2328
2329         nwrap_sp->num++;
2330         return true;
2331 }
2332
2333 static void nwrap_sp_unload(struct nwrap_cache *nwrap)
2334 {
2335         struct nwrap_sp *nwrap_sp;
2336         nwrap_sp = (struct nwrap_sp *)nwrap->private_data;
2337
2338         SAFE_FREE(nwrap_sp->list);
2339         nwrap_sp->num = 0;
2340         nwrap_sp->idx = 0;
2341 }
2342 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
2343
2344 /*
2345  * the caller has to call nwrap_unload() on failure
2346  */
2347 static bool nwrap_gr_parse_line(struct nwrap_cache *nwrap, char *line)
2348 {
2349         struct nwrap_gr *nwrap_gr;
2350         char *c;
2351         char *p;
2352         char *e;
2353         struct group *gr;
2354         size_t list_size;
2355         unsigned nummem;
2356
2357         nwrap_gr = (struct nwrap_gr *)nwrap->private_data;
2358
2359         list_size = sizeof(*nwrap_gr->list) * (nwrap_gr->num+1);
2360         gr = (struct group *)realloc(nwrap_gr->list, list_size);
2361         if (!gr) {
2362                 NWRAP_LOG(NWRAP_LOG_ERROR, "realloc failed");
2363                 return false;
2364         }
2365         nwrap_gr->list = gr;
2366
2367         gr = &nwrap_gr->list[nwrap_gr->num];
2368
2369         c = line;
2370
2371         /* name */
2372         p = strchr(c, ':');
2373         if (!p) {
2374                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
2375                 return false;
2376         }
2377         *p = '\0';
2378         p++;
2379         gr->gr_name = c;
2380         c = p;
2381
2382         NWRAP_LOG(NWRAP_LOG_TRACE, "name[%s]", gr->gr_name);
2383
2384         /* password */
2385         p = strchr(c, ':');
2386         if (!p) {
2387                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
2388                 return false;
2389         }
2390         *p = '\0';
2391         p++;
2392         gr->gr_passwd = c;
2393         c = p;
2394
2395         NWRAP_LOG(NWRAP_LOG_TRACE, "password[%s]", gr->gr_passwd);
2396
2397         /* gid */
2398         p = strchr(c, ':');
2399         if (!p) {
2400                 NWRAP_LOG(NWRAP_LOG_ERROR, "Invalid line[%s]: '%s'", line, c);
2401                 return false;
2402         }
2403         *p = '\0';
2404         p++;
2405         e = NULL;
2406         gr->gr_gid = (gid_t)strtoul(c, &e, 10);
2407         if (c == e) {
2408                 NWRAP_LOG(NWRAP_LOG_ERROR,
2409                           "Invalid line[%s]: '%s' - %s",
2410                           line, c, strerror(errno));
2411                 return false;
2412         }
2413         if (e == NULL) {
2414                 NWRAP_LOG(NWRAP_LOG_ERROR,
2415                           "Invalid line[%s]: '%s' - %s",
2416                           line, c, strerror(errno));
2417                 return false;
2418         }
2419         if (e[0] != '\0') {
2420                 NWRAP_LOG(NWRAP_LOG_ERROR,
2421                           "Invalid line[%s]: '%s' - %s",
2422                           line, c, strerror(errno));
2423                 return false;
2424         }
2425         c = p;
2426
2427         NWRAP_LOG(NWRAP_LOG_TRACE, "gid[%u]", gr->gr_gid);
2428
2429         /* members */
2430         gr->gr_mem = (char **)malloc(sizeof(char *));
2431         if (!gr->gr_mem) {
2432                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
2433                 return false;
2434         }
2435         gr->gr_mem[0] = NULL;
2436
2437         for(nummem=0; p; nummem++) {
2438                 char **m;
2439                 size_t m_size;
2440                 c = p;
2441                 p = strchr(c, ',');
2442                 if (p) {
2443                         *p = '\0';
2444                         p++;
2445                 }
2446
2447                 if (strlen(c) == 0) {
2448                         break;
2449                 }
2450
2451                 m_size = sizeof(char *) * (nummem+2);
2452                 m = (char **)realloc(gr->gr_mem, m_size);
2453                 if (!m) {
2454                         NWRAP_LOG(NWRAP_LOG_ERROR,
2455                                   "realloc(%zd) failed",
2456                                   m_size);
2457                         return false;
2458                 }
2459                 gr->gr_mem = m;
2460                 gr->gr_mem[nummem] = c;
2461                 gr->gr_mem[nummem+1] = NULL;
2462
2463                 NWRAP_LOG(NWRAP_LOG_TRACE,
2464                           "member[%u]: '%s'",
2465                           nummem, gr->gr_mem[nummem]);
2466         }
2467
2468         NWRAP_LOG(NWRAP_LOG_DEBUG,
2469                   "Added group[%s:%s:%u:] with %u members",
2470                   gr->gr_name, gr->gr_passwd, gr->gr_gid, nummem);
2471
2472         nwrap_gr->num++;
2473         return true;
2474 }
2475
2476 static void nwrap_gr_unload(struct nwrap_cache *nwrap)
2477 {
2478         int i;
2479         struct nwrap_gr *nwrap_gr;
2480         nwrap_gr = (struct nwrap_gr *)nwrap->private_data;
2481
2482         if (nwrap_gr->list) {
2483                 for (i=0; i < nwrap_gr->num; i++) {
2484                         SAFE_FREE(nwrap_gr->list[i].gr_mem);
2485                 }
2486                 SAFE_FREE(nwrap_gr->list);
2487         }
2488
2489         nwrap_gr->num = 0;
2490         nwrap_gr->idx = 0;
2491 }
2492
2493 static int nwrap_gr_copy_r(const struct group *src, struct group *dst,
2494                            char *buf, size_t buflen, struct group **dstp)
2495 {
2496         char *first;
2497         char **lastm;
2498         char *last = NULL;
2499         off_t ofsb;
2500         off_t ofsm;
2501         off_t ofs;
2502         unsigned i;
2503
2504         first = src->gr_name;
2505
2506         lastm = src->gr_mem;
2507         while (*lastm) {
2508                 last = *lastm;
2509                 lastm++;
2510         }
2511
2512         if (last == NULL) {
2513                 last = src->gr_passwd;
2514         }
2515         while (*last) last++;
2516
2517         ofsb = PTR_DIFF(last + 1, first);
2518         ofsm = PTR_DIFF(lastm + 1, src->gr_mem);
2519
2520         if ((ofsb + ofsm) > (off_t) buflen) {
2521                 return ERANGE;
2522         }
2523
2524         memcpy(buf, first, ofsb);
2525         memcpy(buf + ofsb, src->gr_mem, ofsm);
2526
2527         ofs = PTR_DIFF(src->gr_name, first);
2528         dst->gr_name = buf + ofs;
2529         ofs = PTR_DIFF(src->gr_passwd, first);
2530         dst->gr_passwd = buf + ofs;
2531         dst->gr_gid = src->gr_gid;
2532
2533         dst->gr_mem = (char **)(buf + ofsb);
2534         for (i=0; src->gr_mem[i]; i++) {
2535                 ofs = PTR_DIFF(src->gr_mem[i], first);
2536                 dst->gr_mem[i] = buf + ofs;
2537         }
2538
2539         if (dstp) {
2540                 *dstp = dst;
2541         }
2542
2543         return 0;
2544 }
2545
2546 static struct nwrap_entlist *nwrap_entlist_init(struct nwrap_entdata *ed)
2547 {
2548         struct nwrap_entlist *el;
2549
2550         if (ed == NULL) {
2551                 NWRAP_LOG(NWRAP_LOG_ERROR,
2552                           "entry is NULL, can't create list item");
2553                 return NULL;
2554         }
2555
2556         el = (struct nwrap_entlist *)malloc(sizeof(struct nwrap_entlist));
2557         if (el == NULL) {
2558                 NWRAP_LOG(NWRAP_LOG_ERROR, "malloc failed");
2559                 return NULL;
2560         }
2561
2562         el->next = NULL;
2563         el->ed = ed;
2564
2565         return el;
2566 }
2567
2568 static bool nwrap_add_ai(char *const ip_addr, struct nwrap_entdata *const ed)
2569 {
2570         ENTRY e;
2571         ENTRY *p;
2572         struct nwrap_entlist *el;
2573
2574         if (ip_addr == NULL) {
2575                 NWRAP_LOG(NWRAP_LOG_ERROR, "ip_addr NULL - can't add");
2576                 return false;
2577         }
2578
2579         el = nwrap_entlist_init(ed);
2580         if (el == NULL) {
2581                 return false;
2582         }
2583
2584         e.key = ip_addr;
2585         e.data = el;
2586
2587         p = hsearch(e, ENTER);
2588         if (p == NULL) {
2589                 NWRAP_LOG(NWRAP_LOG_ERROR, "Hash table is full");
2590                 return false;
2591         }
2592
2593         return true;
2594 }
2595
2596
2597 static bool nwrap_add_hname_add_new(char *const h_name,
2598                                     struct nwrap_entdata *const ed)
2599 {
2600         ENTRY e;
2601         ENTRY *p;
2602         struct nwrap_entlist *el;
2603
2604         if (h_name == NULL) {
2605                 NWRAP_LOG(NWRAP_LOG_ERROR, "h_name NULL - can't add");
2606                 return false;
2607         }
2608
2609         el = nwrap_entlist_init(ed);
2610         if (el == NULL) {
2611                 return false;
2612         }
2613
2614         e.key = h_name;
2615         e.data = (void *)el;
2616
2617         p = hsearch(e, ENTER);
2618         if (p == NULL) {
2619                 NWRAP_LOG(NWRAP_LOG_ERROR, "Hash table is full!");
2620                 return false;
2621         }
2622
2623         return true;
2624 }
2625
2626 static bool nwrap_add_hname_add_to_existing(struct nwrap_entdata *const ed,
2627                                             struct nwrap_entlist *const el)
2628 {
2629         struct nwrap_entlist *cursor;
2630         struct nwrap_entlist *el_new;
2631
2632         if (el == NULL) {
2633                 NWRAP_LOG(NWRAP_LOG_ERROR, "list is NULL, can not add");
2634                 return false;
2635         }
2636
2637         el_new = nwrap_entlist_init(ed);
2638         if (el_new == NULL) {
2639                 return false;
2640         }
2641
2642         for (cursor = el; cursor->next != NULL; cursor = cursor->next)
2643         {
2644                 if (cursor->ed == ed) {
2645                         free(el_new);
2646                         return false;
2647                 }
2648         }
2649
2650         if (cursor->ed == ed) {
2651                 free(el_new);
2652                 return false;
2653         }
2654
2655         cursor->next = el_new;
2656         return true;
2657 }
2658
2659 static bool nwrap_add_hname_alias(char *const h_name_a,
2660                                   struct nwrap_entdata *const ed)
2661 {
2662         ENTRY e;
2663         ENTRY *p;
2664
2665         assert(ed != NULL);
2666         assert(h_name_a != NULL);
2667
2668         e.key = h_name_a;
2669         e.data = NULL;
2670         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching name: %s", e.key);
2671         p = hsearch(e, FIND);
2672         if (p == NULL) {
2673                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found. Adding...", h_name_a);
2674                 nwrap_add_hname_add_new(h_name_a, ed);
2675         } else {
2676                 struct nwrap_entlist *el = (struct nwrap_entlist *)p->data;
2677
2678                 assert(p->data != NULL);
2679                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s found. Add record to list.", h_name_a);
2680                 nwrap_add_hname_add_to_existing(ed, el);
2681         }
2682
2683         return true;
2684 }
2685
2686 static bool nwrap_add_hname(struct nwrap_entdata *const ed)
2687 {
2688         char *const h_name = (char *const)(ed->ht.h_name);
2689         ENTRY e;
2690         ENTRY *p;
2691         unsigned i;
2692
2693         assert(ed != NULL);
2694         assert(h_name != NULL);
2695
2696         e.key = h_name;
2697         e.data = NULL;
2698         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching name: %s", e.key);
2699         p = hsearch(e, FIND);
2700         if (p == NULL) {
2701                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found. Adding...", h_name);
2702                 nwrap_add_hname_add_new(h_name, ed);
2703         } else {
2704                 struct nwrap_entlist *el = (struct nwrap_entlist *)p->data;
2705
2706                 assert(p->data != NULL);
2707                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s found. Add record to list.", h_name);
2708                 nwrap_add_hname_add_to_existing(ed, el);
2709         }
2710
2711         if (ed->ht.h_aliases == NULL) {
2712                 return true;
2713         }
2714
2715         /* Itemize aliases */
2716         for (i = 0; ed->ht.h_aliases[i] != NULL; ++i) {
2717                 char *h_name_alias;
2718
2719                 h_name_alias = ed->ht.h_aliases[i];
2720                 assert(h_name_alias != NULL);
2721
2722                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Add alias: %s", h_name_alias);
2723
2724                 if (!nwrap_add_hname_alias(h_name_alias, ed)) {
2725                         NWRAP_LOG(NWRAP_LOG_DEBUG,
2726                                   "Unable to add alias: %s", h_name_alias);
2727                 }
2728         }
2729
2730         return true;
2731 }
2732
2733 static bool nwrap_he_parse_line(struct nwrap_cache *nwrap, char *line)
2734 {
2735         struct nwrap_he *nwrap_he = (struct nwrap_he *)nwrap->private_data;
2736         bool do_aliases = true;
2737         ssize_t aliases_count = 0;
2738         char *p;
2739         char *i;
2740         char *n;
2741
2742         char *ip;
2743
2744         struct nwrap_entdata *ed = (struct nwrap_entdata *)
2745                                    malloc(sizeof(struct nwrap_entdata));
2746         if (ed == NULL) {
2747                 NWRAP_LOG(NWRAP_LOG_ERROR,
2748                           "Unable to allocate memory for nwrap_entdata");
2749                 return false;
2750         }
2751         ZERO_STRUCTP(ed);
2752
2753         i = line;
2754
2755         /*
2756          * IP
2757          */
2758
2759         /* Walk to first char */
2760         for (p = i; *p != '.' && *p != ':' && !isxdigit((int) *p); p++) {
2761                 if (*p == '\0') {
2762                         NWRAP_LOG(NWRAP_LOG_ERROR,
2763                                   "Invalid line[%s]: '%s'",
2764                                   line, i);
2765                         free(ed);
2766                         return false;
2767                 }
2768         }
2769
2770         for (i = p; !isspace((int)*p); p++) {
2771                 if (*p == '\0') {
2772                         NWRAP_LOG(NWRAP_LOG_ERROR,
2773                                   "Invalid line[%s]: '%s'",
2774                                   line, i);
2775                         free(ed);
2776                         return false;
2777                 }
2778         }
2779
2780         *p = '\0';
2781
2782         if (inet_pton(AF_INET, i, ed->addr.host_addr)) {
2783                 ed->ht.h_addrtype = AF_INET;
2784                 ed->ht.h_length = 4;
2785 #ifdef HAVE_IPV6
2786         } else if (inet_pton(AF_INET6, i, ed->addr.host_addr)) {
2787                 ed->ht.h_addrtype = AF_INET6;
2788                 ed->ht.h_length = 16;
2789 #endif
2790         } else {
2791                 NWRAP_LOG(NWRAP_LOG_ERROR,
2792                           "Invalid line[%s]: '%s'",
2793                           line, i);
2794
2795                 free(ed);
2796                 return false;
2797         }
2798         ip = i;
2799
2800         nwrap_vector_add_item(&(ed->nwrap_addrdata),
2801                               (void *const)ed->addr.host_addr);
2802         ed->ht.h_addr_list = nwrap_vector_head(&ed->nwrap_addrdata);
2803
2804         p++;
2805
2806         /*
2807          * FQDN
2808          */
2809
2810         /* Walk to first char */
2811         for (n = p; *p != '_' && !isalnum((int) *p); p++) {
2812                 if (*p == '\0') {
2813                         NWRAP_LOG(NWRAP_LOG_ERROR,
2814                                   "Invalid line[%s]: '%s'",
2815                                   line, n);
2816
2817                         free(ed);
2818                         return false;
2819                 }
2820         }
2821
2822         for (n = p; !isspace((int)*p); p++) {
2823                 if (*p == '\0') {
2824                         do_aliases = false;
2825                         break;
2826                 }
2827         }
2828
2829         *p = '\0';
2830
2831         /* Convert to lowercase. This operate on same memory region */
2832         str_tolower(n, n);
2833         ed->ht.h_name = n;
2834
2835         /* glib's getent always dereferences he->h_aliases */
2836         ed->ht.h_aliases = malloc(sizeof(char *));
2837         if (ed->ht.h_aliases == NULL) {
2838                 free(ed);
2839                 return false;
2840         }
2841         ed->ht.h_aliases[0] = NULL;
2842
2843         /*
2844          * Aliases
2845          */
2846         while (do_aliases) {
2847                 char **aliases;
2848                 char *a;
2849
2850                 p++;
2851
2852                 /* Walk to first char */
2853                 for (a = p; *p != '_' && !isalnum((int) *p); p++) {
2854                         if (*p == '\0') {
2855                                 do_aliases = false;
2856                                 break;
2857                         }
2858                 }
2859                 /* Only trailing spaces are left */
2860                 if (!do_aliases) {
2861                         break;
2862                 }
2863
2864                 for (a = p; !isspace((int)*p); p++) {
2865                         if (*p == '\0') {
2866                                 do_aliases = false;
2867                                 break;
2868                         }
2869                 }
2870
2871                 *p = '\0';
2872
2873                 aliases = realloc(ed->ht.h_aliases, sizeof(char *) * (aliases_count + 2));
2874                 if (aliases == NULL) {
2875                         free(ed);
2876                         return false;
2877                 }
2878                 ed->ht.h_aliases = aliases;
2879
2880                 str_tolower(a, a);
2881                 aliases[aliases_count] = a;
2882                 aliases[aliases_count + 1] = NULL;
2883
2884                 aliases_count += 1;
2885         }
2886
2887         nwrap_vector_add_item(&(nwrap_he->entdata), (void *const)ed);
2888
2889         ed->aliases_count = aliases_count;
2890         /* Inventarize item */
2891         nwrap_add_hname(ed);
2892         nwrap_add_ai(ip, ed);
2893
2894         nwrap_he->num++;
2895         return true;
2896 }
2897
2898 static void nwrap_he_unload(struct nwrap_cache *nwrap)
2899 {
2900         struct nwrap_he *nwrap_he =
2901                 (struct nwrap_he *)nwrap->private_data;
2902         struct nwrap_entdata *ed;
2903         size_t i;
2904
2905         nwrap_vector_foreach (ed, nwrap_he->entdata, i)
2906         {
2907                 SAFE_FREE(ed->nwrap_addrdata.items);
2908                 SAFE_FREE(ed->ht.h_aliases);
2909                 SAFE_FREE(ed);
2910         }
2911         SAFE_FREE(nwrap_he->entdata.items);
2912         nwrap_he->entdata.count = nwrap_he->entdata.capacity = 0;
2913
2914         nwrap_he->num = 0;
2915         nwrap_he->idx = 0;
2916 }
2917
2918
2919 /* user functions */
2920 static struct passwd *nwrap_files_getpwnam(struct nwrap_backend *b,
2921                                            const char *name)
2922 {
2923         int i;
2924
2925         (void) b; /* unused */
2926
2927         NWRAP_LOG(NWRAP_LOG_DEBUG, "Lookup user %s in files", name);
2928
2929         nwrap_files_cache_reload(nwrap_pw_global.cache);
2930
2931         for (i=0; i<nwrap_pw_global.num; i++) {
2932                 if (strcmp(nwrap_pw_global.list[i].pw_name, name) == 0) {
2933                         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] found", name);
2934                         return &nwrap_pw_global.list[i];
2935                 }
2936                 NWRAP_LOG(NWRAP_LOG_DEBUG,
2937                           "user[%s] does not match [%s]",
2938                           name,
2939                           nwrap_pw_global.list[i].pw_name);
2940         }
2941
2942         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] not found\n", name);
2943
2944         errno = ENOENT;
2945         return NULL;
2946 }
2947
2948 static int nwrap_files_getpwnam_r(struct nwrap_backend *b,
2949                                   const char *name, struct passwd *pwdst,
2950                                   char *buf, size_t buflen, struct passwd **pwdstp)
2951 {
2952         struct passwd *pw;
2953
2954         pw = nwrap_files_getpwnam(b, name);
2955         if (!pw) {
2956                 if (errno == 0) {
2957                         return ENOENT;
2958                 }
2959                 return errno;
2960         }
2961
2962         return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
2963 }
2964
2965 static struct passwd *nwrap_files_getpwuid(struct nwrap_backend *b,
2966                                            uid_t uid)
2967 {
2968         int i;
2969
2970         (void) b; /* unused */
2971
2972         nwrap_files_cache_reload(nwrap_pw_global.cache);
2973
2974         for (i=0; i<nwrap_pw_global.num; i++) {
2975                 if (nwrap_pw_global.list[i].pw_uid == uid) {
2976                         NWRAP_LOG(NWRAP_LOG_DEBUG, "uid[%u] found", uid);
2977                         return &nwrap_pw_global.list[i];
2978                 }
2979                 NWRAP_LOG(NWRAP_LOG_DEBUG,
2980                           "uid[%u] does not match [%u]",
2981                           uid,
2982                           nwrap_pw_global.list[i].pw_uid);
2983         }
2984
2985         NWRAP_LOG(NWRAP_LOG_DEBUG, "uid[%u] not found\n", uid);
2986
2987         errno = ENOENT;
2988         return NULL;
2989 }
2990
2991 static int nwrap_files_getpwuid_r(struct nwrap_backend *b,
2992                                   uid_t uid, struct passwd *pwdst,
2993                                   char *buf, size_t buflen, struct passwd **pwdstp)
2994 {
2995         struct passwd *pw;
2996
2997         pw = nwrap_files_getpwuid(b, uid);
2998         if (!pw) {
2999                 if (errno == 0) {
3000                         return ENOENT;
3001                 }
3002                 return errno;
3003         }
3004
3005         return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
3006 }
3007
3008 /* user enum functions */
3009 static void nwrap_files_setpwent(struct nwrap_backend *b)
3010 {
3011         (void) b; /* unused */
3012
3013         nwrap_pw_global.idx = 0;
3014 }
3015
3016 static struct passwd *nwrap_files_getpwent(struct nwrap_backend *b)
3017 {
3018         struct passwd *pw;
3019
3020         (void) b; /* unused */
3021
3022         if (nwrap_pw_global.idx == 0) {
3023                 nwrap_files_cache_reload(nwrap_pw_global.cache);
3024         }
3025
3026         if (nwrap_pw_global.idx >= nwrap_pw_global.num) {
3027                 errno = ENOENT;
3028                 return NULL;
3029         }
3030
3031         pw = &nwrap_pw_global.list[nwrap_pw_global.idx++];
3032
3033         NWRAP_LOG(NWRAP_LOG_DEBUG,
3034                   "return user[%s] uid[%u]",
3035                   pw->pw_name, pw->pw_uid);
3036
3037         return pw;
3038 }
3039
3040 static int nwrap_files_getpwent_r(struct nwrap_backend *b,
3041                                   struct passwd *pwdst, char *buf,
3042                                   size_t buflen, struct passwd **pwdstp)
3043 {
3044         struct passwd *pw;
3045
3046         pw = nwrap_files_getpwent(b);
3047         if (!pw) {
3048                 if (errno == 0) {
3049                         return ENOENT;
3050                 }
3051                 return errno;
3052         }
3053
3054         return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
3055 }
3056
3057 static void nwrap_files_endpwent(struct nwrap_backend *b)
3058 {
3059         (void) b; /* unused */
3060
3061         nwrap_pw_global.idx = 0;
3062 }
3063
3064 /* shadow */
3065
3066 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
3067
3068 #ifdef HAVE_SETSPENT
3069 static void nwrap_files_setspent(void)
3070 {
3071         nwrap_sp_global.idx = 0;
3072 }
3073
3074 static struct spwd *nwrap_files_getspent(void)
3075 {
3076         struct spwd *sp;
3077
3078         if (nwrap_sp_global.idx == 0) {
3079                 nwrap_files_cache_reload(nwrap_sp_global.cache);
3080         }
3081
3082         if (nwrap_sp_global.idx >= nwrap_sp_global.num) {
3083                 errno = ENOENT;
3084                 return NULL;
3085         }
3086
3087         sp = &nwrap_sp_global.list[nwrap_sp_global.idx++];
3088
3089         NWRAP_LOG(NWRAP_LOG_DEBUG,
3090                   "return user[%s]",
3091                   sp->sp_namp);
3092
3093         return sp;
3094 }
3095
3096 static void nwrap_files_endspent(void)
3097 {
3098         nwrap_sp_global.idx = 0;
3099 }
3100 #endif /* HAVE_SETSPENT */
3101
3102 static struct spwd *nwrap_files_getspnam(const char *name)
3103 {
3104         int i;
3105
3106         NWRAP_LOG(NWRAP_LOG_DEBUG, "Lookup user %s in files", name);
3107
3108         nwrap_files_cache_reload(nwrap_sp_global.cache);
3109
3110         for (i=0; i<nwrap_sp_global.num; i++) {
3111                 if (strcmp(nwrap_sp_global.list[i].sp_namp, name) == 0) {
3112                         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] found", name);
3113                         return &nwrap_sp_global.list[i];
3114                 }
3115                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3116                           "user[%s] does not match [%s]",
3117                           name,
3118                           nwrap_sp_global.list[i].sp_namp);
3119         }
3120
3121         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] not found\n", name);
3122
3123         errno = ENOENT;
3124         return NULL;
3125 }
3126 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
3127
3128 /* misc functions */
3129 static int nwrap_files_initgroups(struct nwrap_backend *b,
3130                                   const char *user,
3131                                   gid_t group)
3132 {
3133         struct group *grp;
3134         gid_t *groups;
3135         int size = 1;
3136         int rc;
3137
3138         groups = (gid_t *)malloc(size * sizeof(gid_t));
3139         if (groups == NULL) {
3140                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
3141                 errno = ENOMEM;
3142                 return -1;
3143         }
3144         groups[0] = group;
3145
3146         nwrap_files_setgrent(b);
3147         while ((grp = nwrap_files_getgrent(b)) != NULL) {
3148                 int i = 0;
3149
3150                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3151                           "Inspecting %s for group membership",
3152                           grp->gr_name);
3153
3154                 for (i=0; grp->gr_mem && grp->gr_mem[i] != NULL; i++) {
3155                         if (group != grp->gr_gid &&
3156                             (strcmp(user, grp->gr_mem[i]) == 0)) {
3157                                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3158                                           "%s is member of %s",
3159                                           user,
3160                                           grp->gr_name);
3161
3162                                 groups = (gid_t *)realloc(groups,
3163                                                           (size + 1) * sizeof(gid_t));
3164                                 if (groups == NULL) {
3165                                         NWRAP_LOG(NWRAP_LOG_ERROR,
3166                                                   "Out of memory");
3167                                         errno = ENOMEM;
3168                                         return -1;
3169                                 }
3170
3171                                 groups[size] = grp->gr_gid;
3172                                 size++;
3173                         }
3174                 }
3175         }
3176
3177         nwrap_files_endgrent(b);
3178
3179         NWRAP_LOG(NWRAP_LOG_DEBUG,
3180                   "%s is member of %d groups",
3181                   user, size);
3182
3183         /* This really only works if uid_wrapper is loaded */
3184         rc = setgroups(size, groups);
3185
3186         free(groups);
3187
3188         return rc;
3189 }
3190
3191 /* group functions */
3192 static struct group *nwrap_files_getgrnam(struct nwrap_backend *b,
3193                                           const char *name)
3194 {
3195         int i;
3196
3197         (void) b; /* unused */
3198
3199         nwrap_files_cache_reload(nwrap_gr_global.cache);
3200
3201         for (i=0; i<nwrap_gr_global.num; i++) {
3202                 if (strcmp(nwrap_gr_global.list[i].gr_name, name) == 0) {
3203                         NWRAP_LOG(NWRAP_LOG_DEBUG, "group[%s] found", name);
3204                         return &nwrap_gr_global.list[i];
3205                 }
3206                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3207                           "group[%s] does not match [%s]",
3208                           name,
3209                           nwrap_gr_global.list[i].gr_name);
3210         }
3211
3212         NWRAP_LOG(NWRAP_LOG_DEBUG, "group[%s] not found", name);
3213
3214         errno = ENOENT;
3215         return NULL;
3216 }
3217
3218 static int nwrap_files_getgrnam_r(struct nwrap_backend *b,
3219                                   const char *name, struct group *grdst,
3220                                   char *buf, size_t buflen, struct group **grdstp)
3221 {
3222         struct group *gr;
3223
3224         gr = nwrap_files_getgrnam(b, name);
3225         if (!gr) {
3226                 if (errno == 0) {
3227                         return ENOENT;
3228                 }
3229                 return errno;
3230         }
3231
3232         return nwrap_gr_copy_r(gr, grdst, buf, buflen, grdstp);
3233 }
3234
3235 static struct group *nwrap_files_getgrgid(struct nwrap_backend *b,
3236                                           gid_t gid)
3237 {
3238         int i;
3239
3240         (void) b; /* unused */
3241
3242         nwrap_files_cache_reload(nwrap_gr_global.cache);
3243
3244         for (i=0; i<nwrap_gr_global.num; i++) {
3245                 if (nwrap_gr_global.list[i].gr_gid == gid) {
3246                         NWRAP_LOG(NWRAP_LOG_DEBUG, "gid[%u] found", gid);
3247                         return &nwrap_gr_global.list[i];
3248                 }
3249                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3250                           "gid[%u] does not match [%u]",
3251                           gid,
3252                           nwrap_gr_global.list[i].gr_gid);
3253         }
3254
3255         NWRAP_LOG(NWRAP_LOG_DEBUG, "gid[%u] not found", gid);
3256
3257         errno = ENOENT;
3258         return NULL;
3259 }
3260
3261 static int nwrap_files_getgrgid_r(struct nwrap_backend *b,
3262                                   gid_t gid, struct group *grdst,
3263                                   char *buf, size_t buflen, struct group **grdstp)
3264 {
3265         struct group *gr;
3266
3267         gr = nwrap_files_getgrgid(b, gid);
3268         if (!gr) {
3269                 if (errno == 0) {
3270                         return ENOENT;
3271                 }
3272                 return errno;
3273         }
3274
3275         return nwrap_gr_copy_r(gr, grdst, buf, buflen, grdstp);
3276 }
3277
3278 /* group enum functions */
3279 static void nwrap_files_setgrent(struct nwrap_backend *b)
3280 {
3281         (void) b; /* unused */
3282
3283         nwrap_gr_global.idx = 0;
3284 }
3285
3286 static struct group *nwrap_files_getgrent(struct nwrap_backend *b)
3287 {
3288         struct group *gr;
3289
3290         (void) b; /* unused */
3291
3292         if (nwrap_gr_global.idx == 0) {
3293                 nwrap_files_cache_reload(nwrap_gr_global.cache);
3294         }
3295
3296         if (nwrap_gr_global.idx >= nwrap_gr_global.num) {
3297                 errno = ENOENT;
3298                 return NULL;
3299         }
3300
3301         gr = &nwrap_gr_global.list[nwrap_gr_global.idx++];
3302
3303         NWRAP_LOG(NWRAP_LOG_DEBUG,
3304                   "return group[%s] gid[%u]",
3305                   gr->gr_name, gr->gr_gid);
3306
3307         return gr;
3308 }
3309
3310 static int nwrap_files_getgrent_r(struct nwrap_backend *b,
3311                                   struct group *grdst, char *buf,
3312                                   size_t buflen, struct group **grdstp)
3313 {
3314         struct group *gr;
3315
3316         gr = nwrap_files_getgrent(b);
3317         if (!gr) {
3318                 if (errno == 0) {
3319                         return ENOENT;
3320                 }
3321                 return errno;
3322         }
3323
3324         return nwrap_gr_copy_r(gr, grdst, buf, buflen, grdstp);
3325 }
3326
3327 static void nwrap_files_endgrent(struct nwrap_backend *b)
3328 {
3329         (void) b; /* unused */
3330
3331         nwrap_gr_global.idx = 0;
3332 }
3333
3334 /* hosts functions */
3335 static int nwrap_files_gethostbyname(const char *name, int af,
3336                                      struct hostent *result,
3337                                      struct nwrap_vector *addr_list)
3338 {
3339         struct nwrap_entlist *el;
3340         struct hostent *he;
3341         char *h_name_lower;
3342         ENTRY e;
3343         ENTRY *e_p;
3344         char canon_name[DNS_NAME_MAX] = { 0 };
3345         size_t name_len;
3346         bool he_found = false;
3347
3348         nwrap_files_cache_reload(nwrap_he_global.cache);
3349
3350         name_len = strlen(name);
3351         if (name_len < sizeof(canon_name) && name[name_len - 1] == '.') {
3352                 strncpy(canon_name, name, name_len - 1);
3353                 name = canon_name;
3354         }
3355
3356         if (!str_tolower_copy(&h_name_lower, name)) {
3357                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3358                           "Out of memory while converting to lower case");
3359                 goto no_ent;
3360         }
3361
3362         /* Look at hash table for element */
3363         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching for name: %s", h_name_lower);
3364         e.key = h_name_lower;
3365         e.data = NULL;
3366         e_p = hsearch(e, FIND);
3367         if (e_p == NULL) {
3368                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found.", h_name_lower);
3369                 SAFE_FREE(h_name_lower);
3370                 goto no_ent;
3371         }
3372         SAFE_FREE(h_name_lower);
3373
3374         /* Always cleanup vector and results */
3375         if (!nwrap_vector_is_initialized(addr_list)) {
3376                 if (!nwrap_vector_init(addr_list)) {
3377                         NWRAP_LOG(NWRAP_LOG_DEBUG,
3378                                   "Unable to initialize memory for addr_list vector");
3379                         goto no_ent;
3380                 }
3381         } else {
3382                 /* When vector is initialized data are valid no more.
3383                  * Quick way how to free vector is: */
3384                 addr_list->count = 0;
3385         }
3386
3387         /* Iterate through results */
3388         for (el = (struct nwrap_entlist *)e_p->data; el != NULL; el = el->next)
3389         {
3390                 he = &(el->ed->ht);
3391
3392                 /* Filter by address familiy if provided */
3393                 if (af != AF_UNSPEC && he->h_addrtype != af) {
3394                         continue;
3395                 }
3396
3397                 /*
3398                  * GLIBC HACK?
3399                  * glibc doesn't return ipv6 addresses when AF_UNSPEC is used
3400                  */
3401                 if (af == AF_UNSPEC && he->h_addrtype != AF_INET) {
3402                         continue;
3403                 }
3404
3405                 if (!he_found) {
3406                         memcpy(result, he, sizeof(struct hostent));
3407                         NWRAP_LOG(NWRAP_LOG_DEBUG,
3408                                   "Name found. Returning record for %s",
3409                                   he->h_name);
3410                         he_found = true;
3411                 }
3412                 nwrap_vector_merge(addr_list, &el->ed->nwrap_addrdata);
3413                 result->h_addr_list = nwrap_vector_head(addr_list);
3414         }
3415
3416         if (he_found) {
3417                 return 0;
3418         }
3419         NWRAP_LOG(NWRAP_LOG_DEBUG,
3420                   "Name found in database. No records matches type.");
3421
3422 no_ent:
3423         errno = ENOENT;
3424         return -1;
3425 }
3426
3427 #ifdef HAVE_GETHOSTBYNAME_R
3428 static int nwrap_gethostbyname_r(const char *name,
3429                                  struct hostent *ret,
3430                                  char *buf, size_t buflen,
3431                                  struct hostent **result, int *h_errnop)
3432 {
3433         struct nwrap_vector *addr_list = malloc(sizeof(struct nwrap_vector));
3434         int rc;
3435
3436         if (addr_list == NULL) {
3437                 NWRAP_LOG(NWRAP_LOG_ERROR,
3438                           "Unable to allocate memory for address list");
3439                 errno = ENOENT;
3440                 return -1;
3441         }
3442
3443         ZERO_STRUCTP(addr_list);
3444
3445         rc = nwrap_files_gethostbyname(name, AF_UNSPEC, ret, addr_list);
3446         if (rc == -1) {
3447                 *h_errnop = h_errno;
3448                 if (addr_list->items != NULL) {
3449                         free(addr_list->items);
3450                 }
3451                 SAFE_FREE(addr_list);
3452                 errno = ENOENT;
3453                 return -1;
3454         }
3455
3456         if (buflen < (addr_list->count * sizeof(void *))) {
3457                 SAFE_FREE(addr_list->items);
3458                 SAFE_FREE(addr_list);
3459                 return ERANGE;
3460         }
3461
3462         /* Copy all to user provided buffer and change
3463          * pointers in returned structure.
3464          * +1 is for ending NULL pointer. */
3465         memcpy(buf, addr_list->items, (addr_list->count + 1) * sizeof(void *));
3466
3467         free(addr_list->items);
3468         free(addr_list);
3469
3470         ret->h_addr_list = (char **)buf;
3471         *result = ret;
3472         return 0;
3473 }
3474
3475 int gethostbyname_r(const char *name,
3476                     struct hostent *ret,
3477                     char *buf, size_t buflen,
3478                     struct hostent **result, int *h_errnop)
3479 {
3480         if (!nss_wrapper_hosts_enabled()) {
3481                 return libc_gethostbyname_r(name,
3482                                             ret,
3483                                             buf,
3484                                             buflen,
3485                                             result,
3486                                             h_errnop);
3487         }
3488
3489         return nwrap_gethostbyname_r(name, ret, buf, buflen, result, h_errnop);
3490 }
3491 #endif
3492
3493 static struct addrinfo *nwrap_files_getaddrinfo(const char *name,
3494                                                 unsigned short port,
3495                                                 const struct addrinfo *hints,
3496                                                 struct addrinfo **ai_tail)
3497 {
3498         struct nwrap_entlist *el;
3499         struct hostent *he;
3500         struct addrinfo *ai = NULL;
3501         struct addrinfo *ai_head = NULL;
3502         struct addrinfo *ai_prev = NULL;
3503         char *h_name_lower;
3504         size_t name_len;
3505         char canon_name[DNS_NAME_MAX] = { 0 };
3506         bool skip_canonname = false;
3507         ENTRY e = { 0 };
3508         ENTRY *e_p = NULL;
3509
3510         nwrap_files_cache_reload(nwrap_he_global.cache);
3511
3512         name_len = strlen(name);
3513         if (name_len < DNS_NAME_MAX && name[name_len - 1] == '.') {
3514                 strncpy(canon_name, name, name_len - 1);
3515                 name = canon_name;
3516         }
3517
3518         if (!str_tolower_copy(&h_name_lower, name)) {
3519                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3520                           "Out of memory while converting to lower case");
3521                 return NULL;
3522         }
3523
3524         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching for name: %s", h_name_lower);
3525         e.key = h_name_lower;
3526         e.data = NULL;
3527         e_p = hsearch(e, FIND);
3528         if (e_p == NULL) {
3529                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found.", h_name_lower);
3530                 SAFE_FREE(h_name_lower);
3531                 errno = ENOENT;
3532                 return NULL;
3533         }
3534         NWRAP_LOG(NWRAP_LOG_DEBUG, "Name: %s found.", h_name_lower);
3535         SAFE_FREE(h_name_lower);
3536
3537         for (el = (struct nwrap_entlist *)e_p->data; el != NULL; el = el->next)
3538         {
3539                 int rc;
3540
3541                 he = &(el->ed->ht);
3542
3543                 if (hints->ai_family != AF_UNSPEC &&
3544                     he->h_addrtype != hints->ai_family) {
3545                         continue;
3546                 }
3547
3548                 /* Function allocates memory and returns it in ai. */
3549                 rc = nwrap_convert_he_ai(he,
3550                                          port,
3551                                          hints,
3552                                          &ai,
3553                                          skip_canonname);
3554                 if (rc != 0) {
3555                         /* FIXME: Investigate if this is nice to do... */
3556                         NWRAP_LOG(NWRAP_LOG_ERROR,
3557                                   "Error in converting he to ai! Skipping.");
3558                         continue;
3559                 }
3560                 skip_canonname = true;
3561
3562                 if (ai_head == NULL) {
3563                         ai_head = ai;
3564                 }
3565                 if (ai_prev != NULL) {
3566                         ai_prev->ai_next = ai;
3567                 }
3568                 ai_prev = ai;
3569         }
3570
3571         *ai_tail = ai;
3572         return ai_head;
3573 }
3574
3575 static struct hostent *nwrap_files_gethostbyaddr(const void *addr,
3576                                                  socklen_t len, int type)
3577 {
3578         struct hostent *he;
3579         char ip[NWRAP_INET_ADDRSTRLEN] = {0};
3580         struct nwrap_entdata *ed;
3581         const char *a;
3582         size_t i;
3583
3584         (void) len; /* unused */
3585
3586         nwrap_files_cache_reload(nwrap_he_global.cache);
3587
3588         a = inet_ntop(type, addr, ip, sizeof(ip));
3589         if (a == NULL) {
3590                 errno = EINVAL;
3591                 return NULL;
3592         }
3593
3594         nwrap_vector_foreach(ed, nwrap_he_global.entdata, i)
3595         {
3596                 he = &(ed->ht);
3597                 if (he->h_addrtype != type) {
3598                         continue;
3599                 }
3600
3601                 if (memcmp(addr, he->h_addr_list[0], he->h_length) == 0) {
3602                         return he;
3603                 }
3604         }
3605
3606         errno = ENOENT;
3607         return NULL;
3608 }
3609
3610 #ifdef HAVE_GETHOSTBYADDR_R
3611 static int nwrap_gethostbyaddr_r(const void *addr, socklen_t len, int type,
3612                                  struct hostent *ret,
3613                                  char *buf, size_t buflen,
3614                                  struct hostent **result, int *h_errnop)
3615 {
3616         *result = nwrap_files_gethostbyaddr(addr, len, type);
3617         if (*result != NULL) {
3618                 memset(buf, '\0', buflen);
3619                 *ret = **result;
3620                 return 0;
3621         } else {
3622                 *h_errnop = h_errno;
3623                 return -1;
3624         }
3625 }
3626
3627 int gethostbyaddr_r(const void *addr, socklen_t len, int type,
3628                     struct hostent *ret,
3629                     char *buf, size_t buflen,
3630                     struct hostent **result, int *h_errnop)
3631 {
3632         if (!nss_wrapper_hosts_enabled()) {
3633                 return libc_gethostbyaddr_r(addr,
3634                                             len,
3635                                             type,
3636                                             ret,
3637                                             buf,
3638                                             buflen,
3639                                             result,
3640                                             h_errnop);
3641         }
3642
3643         return nwrap_gethostbyaddr_r(addr, len, type, ret, buf, buflen, result, h_errnop);
3644 }
3645 #endif
3646
3647 /* hosts enum functions */
3648 static void nwrap_files_sethostent(void)
3649 {
3650         nwrap_he_global.idx = 0;
3651 }
3652
3653 static struct hostent *nwrap_files_gethostent(void)
3654 {
3655         struct hostent *he;
3656
3657         if (nwrap_he_global.idx == 0) {
3658                 nwrap_files_cache_reload(nwrap_he_global.cache);
3659         }
3660
3661         if (nwrap_he_global.idx >= nwrap_he_global.num) {
3662                 errno = ENOENT;
3663                 return NULL;
3664         }
3665
3666         he = &((struct nwrap_entdata *)nwrap_he_global.entdata.items[nwrap_he_global.idx++])->ht;
3667
3668         NWRAP_LOG(NWRAP_LOG_DEBUG, "return hosts[%s]", he->h_name);
3669
3670         return he;
3671 }
3672
3673 static void nwrap_files_endhostent(void)
3674 {
3675         nwrap_he_global.idx = 0;
3676 }
3677
3678 /*
3679  * module backend
3680  */
3681
3682
3683 static struct passwd *nwrap_module_getpwnam(struct nwrap_backend *b,
3684                                             const char *name)
3685 {
3686         static struct passwd pwd;
3687         static char buf[1000];
3688         NSS_STATUS status;
3689
3690         if (!b->fns->_nss_getpwnam_r) {
3691                 return NULL;
3692         }
3693
3694         status = b->fns->_nss_getpwnam_r(name, &pwd, buf, sizeof(buf), &errno);
3695         if (status == NSS_STATUS_NOTFOUND) {
3696                 return NULL;
3697         }
3698         if (status != NSS_STATUS_SUCCESS) {
3699                 return NULL;
3700         }
3701
3702         return &pwd;
3703 }
3704
3705 static int nwrap_module_getpwnam_r(struct nwrap_backend *b,
3706                                    const char *name, struct passwd *pwdst,
3707                                    char *buf, size_t buflen, struct passwd **pwdstp)
3708 {
3709         int ret;
3710
3711         (void) b; /* unused */
3712         (void) pwdst; /* unused */
3713         (void) pwdstp; /* unused */
3714
3715         if (!b->fns->_nss_getpwnam_r) {
3716                 return NSS_STATUS_NOTFOUND;
3717         }
3718
3719         ret = b->fns->_nss_getpwnam_r(name, pwdst, buf, buflen, &errno);
3720         switch (ret) {
3721         case NSS_STATUS_SUCCESS:
3722                 return 0;
3723         case NSS_STATUS_NOTFOUND:
3724                 if (errno != 0) {
3725                         return errno;
3726                 }
3727                 return ENOENT;
3728         case NSS_STATUS_TRYAGAIN:
3729                 if (errno != 0) {
3730                         return errno;
3731                 }
3732                 return ERANGE;
3733         default:
3734                 if (errno != 0) {
3735                         return errno;
3736                 }
3737                 return ret;
3738         }
3739 }
3740
3741 static struct passwd *nwrap_module_getpwuid(struct nwrap_backend *b,
3742                                             uid_t uid)
3743 {
3744         static struct passwd pwd;
3745         static char buf[1000];
3746         NSS_STATUS status;
3747
3748         if (!b->fns->_nss_getpwuid_r) {
3749                 return NULL;
3750         }
3751
3752         status = b->fns->_nss_getpwuid_r(uid, &pwd, buf, sizeof(buf), &errno);
3753         if (status == NSS_STATUS_NOTFOUND) {
3754                 return NULL;
3755         }
3756         if (status != NSS_STATUS_SUCCESS) {
3757                 return NULL;
3758         }
3759         return &pwd;
3760 }
3761
3762 static int nwrap_module_getpwuid_r(struct nwrap_backend *b,
3763                                    uid_t uid, struct passwd *pwdst,
3764                                    char *buf, size_t buflen, struct passwd **pwdstp)
3765 {
3766         int ret;
3767
3768         (void) pwdstp; /* unused */
3769
3770         if (!b->fns->_nss_getpwuid_r) {
3771                 return ENOENT;
3772         }
3773
3774         ret = b->fns->_nss_getpwuid_r(uid, pwdst, buf, buflen, &errno);
3775         switch (ret) {
3776         case NSS_STATUS_SUCCESS:
3777                 return 0;
3778         case NSS_STATUS_NOTFOUND:
3779                 if (errno != 0) {
3780                         return errno;
3781                 }
3782                 return ENOENT;
3783         case NSS_STATUS_TRYAGAIN:
3784                 if (errno != 0) {
3785                         return errno;
3786                 }
3787                 return ERANGE;
3788         default:
3789                 if (errno != 0) {
3790                         return errno;
3791                 }
3792                 return ret;
3793         }
3794 }
3795
3796 static void nwrap_module_setpwent(struct nwrap_backend *b)
3797 {
3798         if (!b->fns->_nss_setpwent) {
3799                 return;
3800         }
3801
3802         b->fns->_nss_setpwent();
3803 }
3804
3805 static struct passwd *nwrap_module_getpwent(struct nwrap_backend *b)
3806 {
3807         static struct passwd pwd;
3808         static char buf[1000];
3809         NSS_STATUS status;
3810
3811         if (!b->fns->_nss_getpwent_r) {
3812                 return NULL;
3813         }
3814
3815         status = b->fns->_nss_getpwent_r(&pwd, buf, sizeof(buf), &errno);
3816         if (status == NSS_STATUS_NOTFOUND) {
3817                 return NULL;
3818         }
3819         if (status != NSS_STATUS_SUCCESS) {
3820                 return NULL;
3821         }
3822         return &pwd;
3823 }
3824
3825 static int nwrap_module_getpwent_r(struct nwrap_backend *b,
3826                                    struct passwd *pwdst, char *buf,
3827                                    size_t buflen, struct passwd **pwdstp)
3828 {
3829         int ret;
3830
3831         (void) pwdstp; /* unused */
3832
3833         if (!b->fns->_nss_getpwent_r) {
3834                 return ENOENT;
3835         }
3836
3837         ret = b->fns->_nss_getpwent_r(pwdst, buf, buflen, &errno);
3838         switch (ret) {
3839         case NSS_STATUS_SUCCESS:
3840                 return 0;
3841         case NSS_STATUS_NOTFOUND:
3842                 if (errno != 0) {
3843                         return errno;
3844                 }
3845                 return ENOENT;
3846         case NSS_STATUS_TRYAGAIN:
3847                 if (errno != 0) {
3848                         return errno;
3849                 }
3850                 return ERANGE;
3851         default:
3852                 if (errno != 0) {
3853                         return errno;
3854                 }
3855                 return ret;
3856         }
3857 }
3858
3859 static void nwrap_module_endpwent(struct nwrap_backend *b)
3860 {
3861         if (!b->fns->_nss_endpwent) {
3862                 return;
3863         }
3864
3865         b->fns->_nss_endpwent();
3866 }
3867
3868 static int nwrap_module_initgroups(struct nwrap_backend *b,
3869                                    const char *user, gid_t group)
3870 {
3871         gid_t *groups;
3872         long int start;
3873         long int size;
3874
3875         if (!b->fns->_nss_initgroups) {
3876                 return NSS_STATUS_UNAVAIL;
3877         }
3878
3879         return b->fns->_nss_initgroups(user, group, &start, &size, &groups, 0, &errno);
3880 }
3881
3882 static struct group *nwrap_module_getgrnam(struct nwrap_backend *b,
3883                                            const char *name)
3884 {
3885         static struct group grp;
3886         static char *buf;
3887         static int buflen = 1000;
3888         NSS_STATUS status;
3889
3890         if (!b->fns->_nss_getgrnam_r) {
3891                 return NULL;
3892         }
3893
3894         if (!buf) {
3895                 buf = (char *)malloc(buflen);
3896         }
3897 again:
3898         status = b->fns->_nss_getgrnam_r(name, &grp, buf, buflen, &errno);
3899         if (status == NSS_STATUS_TRYAGAIN) {
3900                 buflen *= 2;
3901                 buf = (char *)realloc(buf, buflen);
3902                 if (!buf) {
3903                         return NULL;
3904                 }
3905                 goto again;
3906         }
3907         if (status == NSS_STATUS_NOTFOUND) {
3908                 SAFE_FREE(buf);
3909                 return NULL;
3910         }
3911         if (status != NSS_STATUS_SUCCESS) {
3912                 SAFE_FREE(buf);
3913                 return NULL;
3914         }
3915         return &grp;
3916 }
3917
3918 static int nwrap_module_getgrnam_r(struct nwrap_backend *b,
3919                                    const char *name, struct group *grdst,
3920                                    char *buf, size_t buflen, struct group **grdstp)
3921 {
3922         int ret;
3923
3924         (void) grdstp; /* unused */
3925
3926         if (!b->fns->_nss_getgrnam_r) {
3927                 return ENOENT;
3928         }
3929
3930         ret = b->fns->_nss_getgrnam_r(name, grdst, buf, buflen, &errno);
3931         switch (ret) {
3932         case NSS_STATUS_SUCCESS:
3933                 return 0;
3934         case NSS_STATUS_NOTFOUND:
3935                 if (errno != 0) {
3936                         return errno;
3937                 }
3938                 return ENOENT;
3939         case NSS_STATUS_TRYAGAIN:
3940                 if (errno != 0) {
3941                         return errno;
3942                 }
3943                 return ERANGE;
3944         default:
3945                 if (errno != 0) {
3946                         return errno;
3947                 }
3948                 return ret;
3949         }
3950 }
3951
3952 static struct group *nwrap_module_getgrgid(struct nwrap_backend *b,
3953                                            gid_t gid)
3954 {
3955         static struct group grp;
3956         static char *buf;
3957         static int buflen = 1000;
3958         NSS_STATUS status;
3959
3960         if (!b->fns->_nss_getgrgid_r) {
3961                 return NULL;
3962         }
3963
3964         if (!buf) {
3965                 buf = (char *)malloc(buflen);
3966         }
3967
3968 again:
3969         status = b->fns->_nss_getgrgid_r(gid, &grp, buf, buflen, &errno);
3970         if (status == NSS_STATUS_TRYAGAIN) {
3971                 buflen *= 2;
3972                 buf = (char *)realloc(buf, buflen);
3973                 if (!buf) {
3974                         return NULL;
3975                 }
3976                 goto again;
3977         }
3978         if (status == NSS_STATUS_NOTFOUND) {
3979                 SAFE_FREE(buf);
3980                 return NULL;
3981         }
3982         if (status != NSS_STATUS_SUCCESS) {
3983                 SAFE_FREE(buf);
3984                 return NULL;
3985         }
3986         return &grp;
3987 }
3988
3989 static int nwrap_module_getgrgid_r(struct nwrap_backend *b,
3990                                    gid_t gid, struct group *grdst,
3991                                    char *buf, size_t buflen, struct group **grdstp)
3992 {
3993         int ret;
3994
3995         (void) grdstp; /* unused */
3996
3997         if (!b->fns->_nss_getgrgid_r) {
3998                 return ENOENT;
3999         }
4000
4001         ret = b->fns->_nss_getgrgid_r(gid, grdst, buf, buflen, &errno);
4002         switch (ret) {
4003         case NSS_STATUS_SUCCESS:
4004                 return 0;
4005         case NSS_STATUS_NOTFOUND:
4006                 if (errno != 0) {
4007                         return errno;
4008                 }
4009                 return ENOENT;
4010         case NSS_STATUS_TRYAGAIN:
4011                 if (errno != 0) {
4012                         return errno;
4013                 }
4014                 return ERANGE;
4015         default:
4016                 if (errno != 0) {
4017                         return errno;
4018                 }
4019                 return ret;
4020         }
4021 }
4022
4023 static void nwrap_module_setgrent(struct nwrap_backend *b)
4024 {
4025         if (!b->fns->_nss_setgrent) {
4026                 return;
4027         }
4028
4029         b->fns->_nss_setgrent();
4030 }
4031
4032 static struct group *nwrap_module_getgrent(struct nwrap_backend *b)
4033 {
4034         static struct group grp;
4035         static char *buf;
4036         static int buflen = 1024;
4037         NSS_STATUS status;
4038
4039         if (!b->fns->_nss_getgrent_r) {
4040                 return NULL;
4041         }
4042
4043         if (!buf) {
4044                 buf = (char *)malloc(buflen);
4045         }
4046
4047 again:
4048         status = b->fns->_nss_getgrent_r(&grp, buf, buflen, &errno);
4049         if (status == NSS_STATUS_TRYAGAIN) {
4050                 buflen *= 2;
4051                 buf = (char *)realloc(buf, buflen);
4052                 if (!buf) {
4053                         return NULL;
4054                 }
4055                 goto again;
4056         }
4057         if (status == NSS_STATUS_NOTFOUND) {
4058                 SAFE_FREE(buf);
4059                 return NULL;
4060         }
4061         if (status != NSS_STATUS_SUCCESS) {
4062                 SAFE_FREE(buf);
4063                 return NULL;
4064         }
4065         return &grp;
4066 }
4067
4068 static int nwrap_module_getgrent_r(struct nwrap_backend *b,
4069                                    struct group *grdst, char *buf,
4070                                    size_t buflen, struct group **grdstp)
4071 {
4072         int ret;
4073
4074         (void) grdstp; /* unused */
4075
4076         if (!b->fns->_nss_getgrent_r) {
4077                 return ENOENT;
4078         }
4079
4080         ret = b->fns->_nss_getgrent_r(grdst, buf, buflen, &errno);
4081         switch (ret) {
4082         case NSS_STATUS_SUCCESS:
4083                 return 0;
4084         case NSS_STATUS_NOTFOUND:
4085                 if (errno != 0) {
4086                         return errno;
4087                 }
4088                 return ENOENT;
4089         case NSS_STATUS_TRYAGAIN:
4090                 if (errno != 0) {
4091                         return errno;
4092                 }
4093                 return ERANGE;
4094         default:
4095                 if (errno != 0) {
4096                         return errno;
4097                 }
4098                 return ret;
4099         }
4100 }
4101
4102 static void nwrap_module_endgrent(struct nwrap_backend *b)
4103 {
4104         if (!b->fns->_nss_endgrent) {
4105                 return;
4106         }
4107
4108         b->fns->_nss_endgrent();
4109 }
4110
4111 /****************************************************************************
4112  *   GETPWNAM
4113  ***************************************************************************/
4114
4115 static struct passwd *nwrap_getpwnam(const char *name)
4116 {
4117         int i;
4118         struct passwd *pwd;
4119
4120         for (i=0; i < nwrap_main_global->num_backends; i++) {
4121                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4122                 pwd = b->ops->nw_getpwnam(b, name);
4123                 if (pwd) {
4124                         return pwd;
4125                 }
4126         }
4127
4128         return NULL;
4129 }
4130
4131 struct passwd *getpwnam(const char *name)
4132 {
4133         if (!nss_wrapper_enabled()) {
4134                 return libc_getpwnam(name);
4135         }
4136
4137         return nwrap_getpwnam(name);
4138 }
4139
4140 /****************************************************************************
4141  *   GETPWNAM_R
4142  ***************************************************************************/
4143
4144 static int nwrap_getpwnam_r(const char *name, struct passwd *pwdst,
4145                             char *buf, size_t buflen, struct passwd **pwdstp)
4146 {
4147         int i,ret;
4148
4149         for (i=0; i < nwrap_main_global->num_backends; i++) {
4150                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4151                 ret = b->ops->nw_getpwnam_r(b, name, pwdst, buf, buflen, pwdstp);
4152                 if (ret == ENOENT) {
4153                         continue;
4154                 }
4155                 return ret;
4156         }
4157
4158         return ENOENT;
4159 }
4160
4161 #ifdef HAVE_GETPWNAM_R
4162 # ifdef HAVE_SOLARIS_GETPWNAM_R
4163 int getpwnam_r(const char *name, struct passwd *pwdst,
4164                char *buf, int buflen, struct passwd **pwdstp)
4165 # else /* HAVE_SOLARIS_GETPWNAM_R */
4166 int getpwnam_r(const char *name, struct passwd *pwdst,
4167                char *buf, size_t buflen, struct passwd **pwdstp)
4168 # endif /* HAVE_SOLARIS_GETPWNAM_R */
4169 {
4170         if (!nss_wrapper_enabled()) {
4171                 return libc_getpwnam_r(name, pwdst, buf, buflen, pwdstp);
4172         }
4173
4174         return nwrap_getpwnam_r(name, pwdst, buf, buflen, pwdstp);
4175 }
4176 #endif
4177
4178 /****************************************************************************
4179  *   GETPWUID
4180  ***************************************************************************/
4181
4182 static struct passwd *nwrap_getpwuid(uid_t uid)
4183 {
4184         int i;
4185         struct passwd *pwd;
4186
4187         for (i=0; i < nwrap_main_global->num_backends; i++) {
4188                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4189                 pwd = b->ops->nw_getpwuid(b, uid);
4190                 if (pwd) {
4191                         return pwd;
4192                 }
4193         }
4194
4195         return NULL;
4196 }
4197
4198 struct passwd *getpwuid(uid_t uid)
4199 {
4200         if (!nss_wrapper_enabled()) {
4201                 return libc_getpwuid(uid);
4202         }
4203
4204         return nwrap_getpwuid(uid);
4205 }
4206
4207 /****************************************************************************
4208  *   GETPWUID_R
4209  ***************************************************************************/
4210
4211 static int nwrap_getpwuid_r(uid_t uid, struct passwd *pwdst,
4212                             char *buf, size_t buflen, struct passwd **pwdstp)
4213 {
4214         int i,ret;
4215
4216         for (i=0; i < nwrap_main_global->num_backends; i++) {
4217                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4218                 ret = b->ops->nw_getpwuid_r(b, uid, pwdst, buf, buflen, pwdstp);
4219                 if (ret == ENOENT) {
4220                         continue;
4221                 }
4222                 return ret;
4223         }
4224
4225         return ENOENT;
4226 }
4227
4228 #ifdef HAVE_SOLARIS_GETPWUID_R
4229 int getpwuid_r(uid_t uid, struct passwd *pwdst,
4230                char *buf, int buflen, struct passwd **pwdstp)
4231 #else
4232 int getpwuid_r(uid_t uid, struct passwd *pwdst,
4233                char *buf, size_t buflen, struct passwd **pwdstp)
4234 #endif
4235 {
4236         if (!nss_wrapper_enabled()) {
4237                 return libc_getpwuid_r(uid, pwdst, buf, buflen, pwdstp);
4238         }
4239
4240         return nwrap_getpwuid_r(uid, pwdst, buf, buflen, pwdstp);
4241 }
4242
4243 /****************************************************************************
4244  *   SETPWENT
4245  ***************************************************************************/
4246
4247 static void nwrap_setpwent(void)
4248 {
4249         int i;
4250
4251         for (i=0; i < nwrap_main_global->num_backends; i++) {
4252                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4253                 b->ops->nw_setpwent(b);
4254         }
4255 }
4256
4257 void setpwent(void)
4258 {
4259         if (!nss_wrapper_enabled()) {
4260                 libc_setpwent();
4261                 return;
4262         }
4263
4264         nwrap_setpwent();
4265 }
4266
4267 /****************************************************************************
4268  *   GETPWENT
4269  ***************************************************************************/
4270
4271 static struct passwd *nwrap_getpwent(void)
4272 {
4273         int i;
4274         struct passwd *pwd;
4275
4276         for (i=0; i < nwrap_main_global->num_backends; i++) {
4277                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4278                 pwd = b->ops->nw_getpwent(b);
4279                 if (pwd) {
4280                         return pwd;
4281                 }
4282         }
4283
4284         return NULL;
4285 }
4286
4287 struct passwd *getpwent(void)
4288 {
4289         if (!nss_wrapper_enabled()) {
4290                 return libc_getpwent();
4291         }
4292
4293         return nwrap_getpwent();
4294 }
4295
4296 /****************************************************************************
4297  *   GETPWENT_R
4298  ***************************************************************************/
4299
4300 static int nwrap_getpwent_r(struct passwd *pwdst, char *buf,
4301                             size_t buflen, struct passwd **pwdstp)
4302 {
4303         int i,ret;
4304
4305         for (i=0; i < nwrap_main_global->num_backends; i++) {
4306                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4307                 ret = b->ops->nw_getpwent_r(b, pwdst, buf, buflen, pwdstp);
4308                 if (ret == ENOENT) {
4309                         continue;
4310                 }
4311                 return ret;
4312         }
4313
4314         return ENOENT;
4315 }
4316
4317 #ifdef HAVE_SOLARIS_GETPWENT_R
4318 struct passwd *getpwent_r(struct passwd *pwdst, char *buf, int buflen)
4319 {
4320         struct passwd *pwdstp = NULL;
4321         int rc;
4322
4323         if (!nss_wrapper_enabled()) {
4324                 return libc_getpwent_r(pwdst, buf, buflen);
4325         }
4326         rc = nwrap_getpwent_r(pwdst, buf, buflen, &pwdstp);
4327         if (rc < 0) {
4328                 return NULL;
4329         }
4330
4331         return pwdstp;
4332 }
4333 #else /* HAVE_SOLARIS_GETPWENT_R */
4334 int getpwent_r(struct passwd *pwdst, char *buf,
4335                size_t buflen, struct passwd **pwdstp)
4336 {
4337         if (!nss_wrapper_enabled()) {
4338                 return libc_getpwent_r(pwdst, buf, buflen, pwdstp);
4339         }
4340
4341         return nwrap_getpwent_r(pwdst, buf, buflen, pwdstp);
4342 }
4343 #endif /* HAVE_SOLARIS_GETPWENT_R */
4344
4345 /****************************************************************************
4346  *   ENDPWENT
4347  ***************************************************************************/
4348
4349 static void nwrap_endpwent(void)
4350 {
4351         int i;
4352
4353         for (i=0; i < nwrap_main_global->num_backends; i++) {
4354                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4355                 b->ops->nw_endpwent(b);
4356         }
4357 }
4358
4359 void endpwent(void)
4360 {
4361         if (!nss_wrapper_enabled()) {
4362                 libc_endpwent();
4363                 return;
4364         }
4365
4366         nwrap_endpwent();
4367 }
4368
4369 /****************************************************************************
4370  *   INITGROUPS
4371  ***************************************************************************/
4372
4373 static int nwrap_initgroups(const char *user, gid_t group)
4374 {
4375         int i;
4376
4377         for (i=0; i < nwrap_main_global->num_backends; i++) {
4378                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4379                 int rc;
4380
4381                 rc = b->ops->nw_initgroups(b, user, group);
4382                 if (rc == 0) {
4383                         return 0;
4384                 }
4385         }
4386
4387         errno = ENOENT;
4388         return -1;
4389 }
4390
4391 int initgroups(const char *user, gid_t group)
4392 {
4393         if (!nss_wrapper_enabled()) {
4394                 return libc_initgroups(user, group);
4395         }
4396
4397         return nwrap_initgroups(user, group);
4398 }
4399
4400 /****************************************************************************
4401  *   GETGRNAM
4402  ***************************************************************************/
4403
4404 static struct group *nwrap_getgrnam(const char *name)
4405 {
4406         int i;
4407         struct group *grp;
4408
4409         for (i=0; i < nwrap_main_global->num_backends; i++) {
4410                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4411                 grp = b->ops->nw_getgrnam(b, name);
4412                 if (grp) {
4413                         return grp;
4414                 }
4415         }
4416
4417         return NULL;
4418 }
4419
4420 struct group *getgrnam(const char *name)
4421 {
4422         if (!nss_wrapper_enabled()) {
4423                 return libc_getgrnam(name);
4424         }
4425
4426         return nwrap_getgrnam(name);
4427 }
4428
4429 /****************************************************************************
4430  *   GETGRNAM_R
4431  ***************************************************************************/
4432
4433 static int nwrap_getgrnam_r(const char *name, struct group *grdst,
4434                             char *buf, size_t buflen, struct group **grdstp)
4435 {
4436         int i, ret;
4437
4438         for (i=0; i < nwrap_main_global->num_backends; i++) {
4439                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4440                 ret = b->ops->nw_getgrnam_r(b, name, grdst, buf, buflen, grdstp);
4441                 if (ret == ENOENT) {
4442                         continue;
4443                 }
4444                 return ret;
4445         }
4446
4447         return ENOENT;
4448 }
4449
4450 #ifdef HAVE_GETGRNAM_R
4451 # ifdef HAVE_SOLARIS_GETGRNAM_R
4452 int getgrnam_r(const char *name, struct group *grp,
4453                 char *buf, int buflen, struct group **pgrp)
4454 # else /* HAVE_SOLARIS_GETGRNAM_R */
4455 int getgrnam_r(const char *name, struct group *grp,
4456                char *buf, size_t buflen, struct group **pgrp)
4457 # endif /* HAVE_SOLARIS_GETGRNAM_R */
4458 {
4459         if (!nss_wrapper_enabled()) {
4460                 return libc_getgrnam_r(name,
4461                                        grp,
4462                                        buf,
4463                                        buflen,
4464                                        pgrp);
4465         }
4466
4467         return nwrap_getgrnam_r(name, grp, buf, buflen, pgrp);
4468 }
4469 #endif /* HAVE_GETGRNAM_R */
4470
4471 /****************************************************************************
4472  *   GETGRGID
4473  ***************************************************************************/
4474
4475 static struct group *nwrap_getgrgid(gid_t gid)
4476 {
4477         int i;
4478         struct group *grp;
4479
4480         for (i=0; i < nwrap_main_global->num_backends; i++) {
4481                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4482                 grp = b->ops->nw_getgrgid(b, gid);
4483                 if (grp) {
4484                         return grp;
4485                 }
4486         }
4487
4488         return NULL;
4489 }
4490
4491 struct group *getgrgid(gid_t gid)
4492 {
4493         if (!nss_wrapper_enabled()) {
4494                 return libc_getgrgid(gid);
4495         }
4496
4497         return nwrap_getgrgid(gid);
4498 }
4499
4500 /****************************************************************************
4501  *   GETGRGID_R
4502  ***************************************************************************/
4503
4504 static int nwrap_getgrgid_r(gid_t gid, struct group *grdst,
4505                             char *buf, size_t buflen, struct group **grdstp)
4506 {
4507         int i,ret;
4508
4509         for (i=0; i < nwrap_main_global->num_backends; i++) {
4510                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4511                 ret = b->ops->nw_getgrgid_r(b, gid, grdst, buf, buflen, grdstp);
4512                 if (ret == ENOENT) {
4513                         continue;
4514                 }
4515                 return ret;
4516         }
4517
4518         return ENOENT;
4519 }
4520
4521 #ifdef HAVE_GETGRGID_R
4522 # ifdef HAVE_SOLARIS_GETGRGID_R
4523 int getgrgid_r(gid_t gid, struct group *grdst,
4524                char *buf, int buflen, struct group **grdstp)
4525 # else /* HAVE_SOLARIS_GETGRGID_R */
4526 int getgrgid_r(gid_t gid, struct group *grdst,
4527                char *buf, size_t buflen, struct group **grdstp)
4528 # endif /* HAVE_SOLARIS_GETGRGID_R */
4529 {
4530         if (!nss_wrapper_enabled()) {
4531                 return libc_getgrgid_r(gid, grdst, buf, buflen, grdstp);
4532         }
4533
4534         return nwrap_getgrgid_r(gid, grdst, buf, buflen, grdstp);
4535 }
4536 #endif
4537
4538 /****************************************************************************
4539  *   SETGRENT
4540  ***************************************************************************/
4541
4542 static void nwrap_setgrent(void)
4543 {
4544         int i;
4545
4546         for (i=0; i < nwrap_main_global->num_backends; i++) {
4547                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4548                 b->ops->nw_setgrent(b);
4549         }
4550 }
4551
4552 #ifdef HAVE_BSD_SETGRENT
4553 int setgrent(void)
4554 #else
4555 void setgrent(void)
4556 #endif
4557 {
4558         if (!nss_wrapper_enabled()) {
4559                 libc_setgrent();
4560                 goto out;
4561         }
4562
4563         nwrap_setgrent();
4564
4565 out:
4566 #ifdef HAVE_BSD_SETGRENT
4567         return 0;
4568 #else
4569         return;
4570 #endif
4571 }
4572
4573 /****************************************************************************
4574  *   GETGRENT
4575  ***************************************************************************/
4576
4577 static struct group *nwrap_getgrent(void)
4578 {
4579         int i;
4580         struct group *grp;
4581
4582         for (i=0; i < nwrap_main_global->num_backends; i++) {
4583                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4584                 grp = b->ops->nw_getgrent(b);
4585                 if (grp) {
4586                         return grp;
4587                 }
4588         }
4589
4590         return NULL;
4591 }
4592
4593 struct group *getgrent(void)
4594 {
4595         if (!nss_wrapper_enabled()) {
4596                 return libc_getgrent();
4597         }
4598
4599         return nwrap_getgrent();
4600 }
4601
4602 /****************************************************************************
4603  *   GETGRENT_R
4604  ***************************************************************************/
4605
4606 static int nwrap_getgrent_r(struct group *grdst, char *buf,
4607                             size_t buflen, struct group **grdstp)
4608 {
4609         int i,ret;
4610
4611         for (i=0; i < nwrap_main_global->num_backends; i++) {
4612                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4613                 ret = b->ops->nw_getgrent_r(b, grdst, buf, buflen, grdstp);
4614                 if (ret == ENOENT) {
4615                         continue;
4616                 }
4617                 return ret;
4618         }
4619
4620         return ENOENT;
4621 }
4622
4623 #ifdef HAVE_SOLARIS_GETGRENT_R
4624 struct group *getgrent_r(struct group *src, char *buf, int buflen)
4625 {
4626         struct group *grdstp = NULL;
4627         int rc;
4628
4629         if (!nss_wrapper_enabled()) {
4630                 return libc_getgrent_r(src, buf, buflen);
4631         }
4632
4633         rc = nwrap_getgrent_r(src, buf, buflen, &grdstp);
4634         if (rc < 0) {
4635                 return NULL;
4636         }
4637
4638         return grdstp;
4639 }
4640 #else /* HAVE_SOLARIS_GETGRENT_R */
4641 int getgrent_r(struct group *src, char *buf,
4642                size_t buflen, struct group **grdstp)
4643 {
4644         if (!nss_wrapper_enabled()) {
4645                 return libc_getgrent_r(src, buf, buflen, grdstp);
4646         }
4647
4648         return nwrap_getgrent_r(src, buf, buflen, grdstp);
4649 }
4650 #endif /* HAVE_SOLARIS_GETGRENT_R */
4651
4652 /****************************************************************************
4653  *   ENDGRENT
4654  ***************************************************************************/
4655
4656 static void nwrap_endgrent(void)
4657 {
4658         int i;
4659
4660         for (i=0; i < nwrap_main_global->num_backends; i++) {
4661                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4662                 b->ops->nw_endgrent(b);
4663         }
4664 }
4665
4666 void endgrent(void)
4667 {
4668         if (!nss_wrapper_enabled()) {
4669                 libc_endgrent();
4670                 return;
4671         }
4672
4673         nwrap_endgrent();
4674 }
4675
4676 /****************************************************************************
4677  *   GETGROUPLIST
4678  ***************************************************************************/
4679
4680 #ifdef HAVE_GETGROUPLIST
4681 static int nwrap_getgrouplist(const char *user, gid_t group,
4682                               gid_t *groups, int *ngroups)
4683 {
4684         struct group *grp;
4685         gid_t *groups_tmp;
4686         int count = 1;
4687
4688         NWRAP_LOG(NWRAP_LOG_DEBUG, "getgrouplist called for %s", user);
4689
4690         groups_tmp = (gid_t *)malloc(count * sizeof(gid_t));
4691         if (!groups_tmp) {
4692                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
4693                 errno = ENOMEM;
4694                 return -1;
4695         }
4696         groups_tmp[0] = group;
4697
4698         nwrap_setgrent();
4699         while ((grp = nwrap_getgrent()) != NULL) {
4700                 int i = 0;
4701
4702                 NWRAP_LOG(NWRAP_LOG_DEBUG,
4703                           "Inspecting %s for group membership",
4704                           grp->gr_name);
4705
4706                 for (i=0; grp->gr_mem && grp->gr_mem[i] != NULL; i++) {
4707
4708                         if (group != grp->gr_gid &&
4709                             (strcmp(user, grp->gr_mem[i]) == 0)) {
4710
4711                                 NWRAP_LOG(NWRAP_LOG_DEBUG,
4712                                           "%s is member of %s",
4713                                           user,
4714                                           grp->gr_name);
4715
4716                                 groups_tmp = (gid_t *)realloc(groups_tmp, (count + 1) * sizeof(gid_t));
4717                                 if (!groups_tmp) {
4718                                         NWRAP_LOG(NWRAP_LOG_ERROR,
4719                                                   "Out of memory");
4720                                         errno = ENOMEM;
4721                                         return -1;
4722                                 }
4723                                 groups_tmp[count] = grp->gr_gid;
4724
4725                                 count++;
4726                         }
4727                 }
4728         }
4729
4730         nwrap_endgrent();
4731
4732         NWRAP_LOG(NWRAP_LOG_DEBUG,
4733                   "%s is member of %d groups",
4734                   user, *ngroups);
4735
4736         if (*ngroups < count) {
4737                 *ngroups = count;
4738                 free(groups_tmp);
4739                 return -1;
4740         }
4741
4742         *ngroups = count;
4743         memcpy(groups, groups_tmp, count * sizeof(gid_t));
4744         free(groups_tmp);
4745
4746         return count;
4747 }
4748
4749 int getgrouplist(const char *user, gid_t group, gid_t *groups, int *ngroups)
4750 {
4751         if (!nss_wrapper_enabled()) {
4752                 return libc_getgrouplist(user, group, groups, ngroups);
4753         }
4754
4755         return nwrap_getgrouplist(user, group, groups, ngroups);
4756 }
4757 #endif
4758
4759 /**********************************************************
4760  * SHADOW
4761  **********************************************************/
4762
4763 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
4764
4765 #ifdef HAVE_SETSPENT
4766 static void nwrap_setspent(void)
4767 {
4768         nwrap_files_setspent();
4769 }
4770
4771 void setspent(void)
4772 {
4773         if (!nss_wrapper_shadow_enabled()) {
4774                 return;
4775         }
4776
4777         nwrap_setspent();
4778 }
4779
4780 static struct spwd *nwrap_getspent(void)
4781 {
4782         return nwrap_files_getspent();
4783 }
4784
4785 struct spwd *getspent(void)
4786 {
4787         if (!nss_wrapper_shadow_enabled()) {
4788                 return NULL;
4789         }
4790
4791         return nwrap_getspent();
4792 }
4793
4794 static void nwrap_endspent(void)
4795 {
4796         nwrap_files_endspent();
4797 }
4798
4799 void endspent(void)
4800 {
4801         if (!nss_wrapper_shadow_enabled()) {
4802                 return;
4803         }
4804
4805         nwrap_endspent();
4806 }
4807 #endif /* HAVE_SETSPENT */
4808
4809 static struct spwd *nwrap_getspnam(const char *name)
4810 {
4811         return nwrap_files_getspnam(name);
4812 }
4813
4814 struct spwd *getspnam(const char *name)
4815 {
4816         if (!nss_wrapper_shadow_enabled()) {
4817                 return NULL;
4818         }
4819
4820         return nwrap_getspnam(name);
4821 }
4822
4823 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
4824
4825 /**********************************************************
4826  * NETDB
4827  **********************************************************/
4828
4829 static void nwrap_sethostent(int stayopen) {
4830         (void) stayopen; /* ignored */
4831
4832         nwrap_files_sethostent();
4833 }
4834
4835 #ifdef HAVE_SOLARIS_SETHOSTENT
4836 int sethostent(int stayopen)
4837 {
4838         if (!nss_wrapper_hosts_enabled()) {
4839                 libc_sethostent(stayopen);
4840                 return 0;
4841         }
4842
4843         nwrap_sethostent(stayopen);
4844
4845         return 0;
4846 }
4847 #else /* HAVE_SOLARIS_SETHOSTENT */
4848 void sethostent(int stayopen)
4849 {
4850         if (!nss_wrapper_hosts_enabled()) {
4851                 libc_sethostent(stayopen);
4852                 return;
4853         }
4854
4855         nwrap_sethostent(stayopen);
4856 }
4857 #endif /* HAVE_SOLARIS_SETHOSTENT */
4858
4859 static struct hostent *nwrap_gethostent(void)
4860 {
4861         return nwrap_files_gethostent();
4862 }
4863
4864 struct hostent *gethostent(void) {
4865         if (!nss_wrapper_hosts_enabled()) {
4866                 return libc_gethostent();
4867         }
4868
4869         return nwrap_gethostent();
4870 }
4871
4872 static void nwrap_endhostent(void) {
4873         nwrap_files_endhostent();
4874 }
4875
4876 #ifdef HAVE_SOLARIS_ENDHOSTENT
4877 int endhostent(void)
4878 {
4879         if (!nss_wrapper_hosts_enabled()) {
4880                 libc_endhostent();
4881                 return 0;
4882         }
4883
4884         nwrap_endhostent();
4885
4886         return 0;
4887 }
4888 #else /* HAVE_SOLARIS_ENDHOSTENT */
4889 void endhostent(void)
4890 {
4891         if (!nss_wrapper_hosts_enabled()) {
4892                 libc_endhostent();
4893                 return;
4894         }
4895
4896         nwrap_endhostent();
4897 }
4898 #endif /* HAVE_SOLARIS_ENDHOSTENT */
4899
4900 #ifdef BSD
4901 /* BSD implementation stores data in thread local storage but GLIBC does not */
4902 static __thread struct hostent user_he;
4903 static __thread struct nwrap_vector user_addrlist;
4904 #else
4905 static struct hostent user_he;
4906 static struct nwrap_vector user_addrlist;
4907 #endif /* BSD */
4908 static struct hostent *nwrap_gethostbyname(const char *name)
4909 {
4910         if (nwrap_files_gethostbyname(name, AF_UNSPEC, &user_he, &user_addrlist) == -1) {
4911                 return NULL;
4912         }
4913         return &user_he;
4914 }
4915
4916 struct hostent *gethostbyname(const char *name)
4917 {
4918         if (!nss_wrapper_hosts_enabled()) {
4919                 return libc_gethostbyname(name);
4920         }
4921
4922         return nwrap_gethostbyname(name);
4923 }
4924
4925 /* This is a GNU extension - Also can be found on BSD systems */
4926 #ifdef HAVE_GETHOSTBYNAME2
4927 #ifdef BSD
4928 /* BSD implementation stores data in  thread local storage but GLIBC not */
4929 static __thread struct hostent user_he2;
4930 static __thread struct nwrap_vector user_addrlist2;
4931 #else
4932 static struct hostent user_he2;
4933 static struct nwrap_vector user_addrlist2;
4934 #endif /* BSD */
4935 static struct hostent *nwrap_gethostbyname2(const char *name, int af)
4936 {
4937         if (nwrap_files_gethostbyname(name, af, &user_he2, &user_addrlist2) == -1) {
4938                 return NULL;
4939         }
4940         return &user_he2;
4941 }
4942
4943 struct hostent *gethostbyname2(const char *name, int af)
4944 {
4945         if (!nss_wrapper_hosts_enabled()) {
4946                 return libc_gethostbyname2(name, af);
4947         }
4948
4949         return nwrap_gethostbyname2(name, af);
4950 }
4951 #endif
4952
4953 static struct hostent *nwrap_gethostbyaddr(const void *addr,
4954                                            socklen_t len, int type)
4955 {
4956         return nwrap_files_gethostbyaddr(addr, len, type);
4957 }
4958
4959 struct hostent *gethostbyaddr(const void *addr,
4960                               socklen_t len, int type)
4961 {
4962         if (!nss_wrapper_hosts_enabled()) {
4963                 return libc_gethostbyaddr(addr, len, type);
4964         }
4965
4966         return nwrap_gethostbyaddr(addr, len, type);
4967 }
4968
4969 static const struct addrinfo default_hints =
4970 {
4971         .ai_flags = AI_ADDRCONFIG|AI_V4MAPPED,
4972         .ai_family = AF_UNSPEC,
4973         .ai_socktype = 0,
4974         .ai_protocol = 0,
4975         .ai_addrlen = 0,
4976         .ai_addr = NULL,
4977         .ai_canonname = NULL,
4978         .ai_next = NULL
4979 };
4980
4981 static int nwrap_convert_he_ai(const struct hostent *he,
4982                                unsigned short port,
4983                                const struct addrinfo *hints,
4984                                struct addrinfo **pai,
4985                                bool skip_canonname)
4986 {
4987         struct addrinfo *ai;
4988         socklen_t socklen;
4989
4990         if (he == NULL) {
4991                 return EAI_MEMORY;
4992         }
4993
4994         switch (he->h_addrtype) {
4995                 case AF_INET:
4996                         socklen = sizeof(struct sockaddr_in);
4997                         break;
4998 #ifdef HAVE_IPV6
4999                 case AF_INET6:
5000                         socklen = sizeof(struct sockaddr_in6);
5001                         break;
5002 #endif
5003                 default:
5004                         return EAI_FAMILY;
5005         }
5006
5007         ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) + socklen);
5008         if (ai == NULL) {
5009                 return EAI_MEMORY;
5010         }
5011
5012         ai->ai_flags = 0;
5013         ai->ai_family = he->h_addrtype;
5014         ai->ai_socktype = hints->ai_socktype;
5015         ai->ai_protocol = hints->ai_protocol;
5016         ai->ai_canonname = NULL;
5017
5018         ai->ai_addrlen = socklen;
5019         ai->ai_addr = (void *)(ai + 1);
5020
5021 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
5022         ai->ai_addr->sa_len = socklen;
5023 #endif
5024         ai->ai_addr->sa_family = he->h_addrtype;
5025
5026         switch (he->h_addrtype) {
5027                 case AF_INET:
5028                 {
5029                         struct sockaddr_in *sinp =
5030                                 (struct sockaddr_in *) ai->ai_addr;
5031
5032                         memset(sinp, 0, sizeof(struct sockaddr_in));
5033
5034                         sinp->sin_port = htons(port);
5035                         sinp->sin_family = AF_INET;
5036
5037                         memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero));
5038                         memcpy(&sinp->sin_addr, he->h_addr_list[0], he->h_length);
5039
5040                 }
5041                 break;
5042 #ifdef HAVE_IPV6
5043                 case AF_INET6:
5044                 {
5045                         struct sockaddr_in6 *sin6p =
5046                                 (struct sockaddr_in6 *) ai->ai_addr;
5047
5048                         memset(sin6p, 0, sizeof(struct sockaddr_in6));
5049
5050                         sin6p->sin6_port = htons(port);
5051                         sin6p->sin6_family = AF_INET6;
5052
5053                         memcpy(&sin6p->sin6_addr,
5054                                he->h_addr_list[0],
5055                                he->h_length);
5056                 }
5057                 break;
5058 #endif
5059         }
5060
5061         ai->ai_next = NULL;
5062
5063         if (he->h_name && !skip_canonname) {
5064                 ai->ai_canonname = strdup(he->h_name);
5065                 if (ai->ai_canonname == NULL) {
5066                         freeaddrinfo(ai);
5067                         return EAI_MEMORY;
5068                 }
5069         }
5070
5071         *pai = ai;
5072         return 0;
5073 }
5074
5075 static int nwrap_getaddrinfo(const char *node,
5076                              const char *service,
5077                              const struct addrinfo *hints,
5078                              struct addrinfo **res)
5079 {
5080         struct addrinfo *ai = NULL;
5081         struct addrinfo *ai_tail;
5082         unsigned short port = 0;
5083         struct {
5084                 int family;
5085                 union {
5086                         struct in_addr v4;
5087 #ifdef HAVE_IPV6
5088                         struct in6_addr v6;
5089                 } in;
5090 #endif
5091         } addr = {
5092                 .family = AF_UNSPEC,
5093         };
5094
5095         if (node == NULL && service == NULL) {
5096                 return EAI_NONAME;
5097         }
5098
5099         if (hints == NULL) {
5100                 hints = &default_hints;
5101         }
5102
5103         /* EAI_BADFLAGS
5104               hints.ai_flags   contains   invalid  flags;  or,  hints.ai_flags
5105               included AI_CANONNAME and name was NULL.
5106         */
5107         if ((hints->ai_flags & AI_CANONNAME) && (node == NULL)) {
5108                 return EAI_BADFLAGS;
5109         }
5110
5111         /* If no node has been specified, let glibc deal with it */
5112         if (node == NULL) {
5113                 int ret;
5114                 struct addrinfo *p = NULL;
5115
5116                 ret = libc_getaddrinfo(node, service, hints, &p);
5117
5118                 if (ret == 0) {
5119                         *res = p;
5120                 }
5121                 return ret;
5122         }
5123
5124         if (service != NULL && service[0] != '\0') {
5125                 const char *proto = NULL;
5126                 struct servent *s;
5127                 char *end_ptr;
5128                 long sl;
5129
5130                 errno = 0;
5131                 sl = strtol(service, &end_ptr, 10);
5132
5133                 if (*end_ptr == '\0') {
5134                         port = sl;
5135                         goto valid_port;
5136                 } else if (hints->ai_flags & AI_NUMERICSERV) {
5137                         return EAI_NONAME;
5138                 }
5139
5140                 if (hints->ai_protocol != 0) {
5141                         struct protoent *pent;
5142
5143                         pent = getprotobynumber(hints->ai_protocol);
5144                         if (pent != NULL) {
5145                                 proto = pent->p_name;
5146                         }
5147                 }
5148
5149                 s = getservbyname(service, proto);
5150                 if (s == NULL) {
5151                         return EAI_NONAME;
5152                 }
5153                 port = ntohs(s->s_port);
5154         }
5155
5156 valid_port:
5157         if (hints->ai_family == AF_UNSPEC || hints->ai_family == AF_INET) {
5158                 int rc = inet_pton(AF_INET, node, &addr.in.v4);
5159                 if (rc == 1) {
5160                         addr.family = AF_INET;
5161                 }
5162         }
5163 #ifdef HAVE_IPV6
5164         if (addr.family == AF_UNSPEC) {
5165                 int rc = inet_pton(AF_INET6, node, &addr.in.v6);
5166                 if (rc == 1) {
5167                         addr.family = AF_INET6;
5168                 }
5169         }
5170 #endif
5171
5172         ai = nwrap_files_getaddrinfo(node, port, hints, &ai_tail);
5173         if (ai == NULL) {
5174                 int ret;
5175                 struct addrinfo *p = NULL;
5176
5177                 ret = libc_getaddrinfo(node, service, hints, &p);
5178
5179                 if (ret == 0) {
5180                         /*
5181                          * nwrap_files_getaddrinfo failed, but libc was
5182                          * successful -- use the result from libc.
5183                          */
5184                         *res = p;
5185                         return 0;
5186                 }
5187
5188                 return EAI_SYSTEM;
5189         }
5190
5191         if (ai->ai_flags == 0) {
5192                 ai->ai_flags = hints->ai_flags;
5193         }
5194         if (ai->ai_socktype == 0) {
5195                 ai->ai_socktype = SOCK_DGRAM;
5196         }
5197         if (ai->ai_protocol == 0 && ai->ai_socktype == SOCK_DGRAM) {
5198                 ai->ai_protocol = 17; /* UDP */
5199         } else if (ai->ai_protocol == 0 && ai->ai_socktype == SOCK_STREAM) {
5200                 ai->ai_protocol = 6; /* TCP */
5201         }
5202
5203         if (hints->ai_socktype == 0) {
5204                 /* Add second ai */
5205                 struct addrinfo *ai_head = ai;
5206                 struct addrinfo *ai_tmp;
5207                 struct addrinfo *ai_new_tail = ai_tail;
5208
5209                 /* Add at least one more struct */
5210                 do {
5211                         /* CHECKS! */
5212                         ai_tmp = malloc(sizeof(struct addrinfo));
5213                         memcpy(ai_tmp, ai_head, sizeof(struct addrinfo));
5214                         ai_tmp->ai_next = NULL;
5215
5216                         /* We need a deep copy or freeaddrinfo() will blow up */
5217                         if (ai_head->ai_canonname != NULL) {
5218                                 ai_tmp->ai_canonname =
5219                                         strdup(ai_head->ai_canonname);
5220                         }
5221                         /* ai_head should point inside hints. */
5222                         ai_tmp->ai_addr = ai_head->ai_addr;
5223
5224                         if (ai_head->ai_flags == 0) {
5225                                 ai_tmp->ai_flags = hints->ai_flags;
5226                         }
5227                         if (ai_head->ai_socktype == SOCK_DGRAM) {
5228                                 ai_tmp->ai_socktype = SOCK_STREAM;
5229                         } else if (ai_head->ai_socktype == SOCK_STREAM) {
5230                                 ai_tmp->ai_socktype = SOCK_DGRAM;
5231                         }
5232                         if (ai_head->ai_socktype == SOCK_DGRAM) {
5233                                 ai_tmp->ai_protocol = 17; /* UDP */
5234                         } else if (ai_head->ai_socktype == SOCK_STREAM) {
5235                                 ai_tmp->ai_protocol = 6; /* TCP */
5236                         }
5237                         ai_new_tail->ai_next = ai_tmp;
5238                         ai_new_tail = ai_tmp;
5239
5240                         if (ai_head == ai_tail) {
5241                                 break;
5242                         }
5243                         ai_head = ai_head->ai_next;
5244                 } while (1);
5245         }
5246
5247         *res = ai;
5248
5249         return 0;
5250 }
5251
5252 int getaddrinfo(const char *node, const char *service,
5253                 const struct addrinfo *hints,
5254                 struct addrinfo **res)
5255 {
5256         if (!nss_wrapper_hosts_enabled()) {
5257                 return libc_getaddrinfo(node, service, hints, res);
5258         }
5259
5260         return nwrap_getaddrinfo(node, service, hints, res);
5261 }
5262
5263 static int nwrap_getnameinfo(const struct sockaddr *sa, socklen_t salen,
5264                              char *host, size_t hostlen,
5265                              char *serv, size_t servlen,
5266                              int flags)
5267 {
5268         struct hostent *he;
5269         struct servent *service;
5270         const char *proto;
5271         const void *addr;
5272         socklen_t addrlen;
5273         uint16_t port;
5274         sa_family_t type;
5275
5276         if (sa == NULL || salen < sizeof(sa_family_t)) {
5277                 return EAI_FAMILY;
5278         }
5279
5280         if ((flags & NI_NAMEREQD) && host == NULL && serv == NULL) {
5281                 return EAI_NONAME;
5282         }
5283
5284         type = sa->sa_family;
5285         switch (type) {
5286         case AF_INET:
5287                 if (salen < sizeof(struct sockaddr_in))
5288                         return EAI_FAMILY;
5289                 addr = &((const struct sockaddr_in *)sa)->sin_addr;
5290                 addrlen = sizeof(((const struct sockaddr_in *)sa)->sin_addr);
5291                 port = ntohs(((const struct sockaddr_in *)sa)->sin_port);
5292                 break;
5293 #ifdef HAVE_IPV6
5294         case AF_INET6:
5295                 if (salen < sizeof(struct sockaddr_in6))
5296                         return EAI_FAMILY;
5297                 addr = &((const struct sockaddr_in6 *)sa)->sin6_addr;
5298                 addrlen = sizeof(((const struct sockaddr_in6 *)sa)->sin6_addr);
5299                 port = ntohs(((const struct sockaddr_in6 *)sa)->sin6_port);
5300                 break;
5301 #endif
5302         default:
5303                 return EAI_FAMILY;
5304         }
5305
5306         if (host != NULL) {
5307                 he = NULL;
5308                 if ((flags & NI_NUMERICHOST) == 0) {
5309                         he = nwrap_files_gethostbyaddr(addr, addrlen, type);
5310                         if ((flags & NI_NAMEREQD) && (he == NULL || he->h_name == NULL))
5311                                 return EAI_NONAME;
5312                 }
5313                 if (he != NULL && he->h_name != NULL) {
5314                         if (strlen(he->h_name) >= hostlen)
5315                                 return EAI_OVERFLOW;
5316                         strcpy(host, he->h_name);
5317                         if (flags & NI_NOFQDN)
5318                                 host[strcspn(host, ".")] = '\0';
5319                 } else {
5320                         if (inet_ntop(type, addr, host, hostlen) == NULL)
5321                                 return (errno == ENOSPC) ? EAI_OVERFLOW : EAI_FAIL;
5322                 }
5323         }
5324
5325         if (serv != NULL) {
5326                 service = NULL;
5327                 if ((flags & NI_NUMERICSERV) == 0) {
5328                         proto = (flags & NI_DGRAM) ? "udp" : "tcp";
5329                         service = getservbyport(htons(port), proto);
5330                 }
5331                 if (service != NULL) {
5332                         if (strlen(service->s_name) >= servlen)
5333                                 return EAI_OVERFLOW;
5334                         strcpy(serv, service->s_name);
5335                 } else {
5336                         if (snprintf(serv, servlen, "%u", port) >= (int) servlen)
5337                                 return EAI_OVERFLOW;
5338                 }
5339         }
5340
5341         return 0;
5342 }
5343
5344 #ifdef HAVE_LINUX_GETNAMEINFO
5345 int getnameinfo(const struct sockaddr *sa, socklen_t salen,
5346                 char *host, socklen_t hostlen,
5347                 char *serv, socklen_t servlen,
5348                 int flags)
5349 #elif defined(HAVE_LINUX_GETNAMEINFO_UNSIGNED)
5350 int getnameinfo(const struct sockaddr *sa, socklen_t salen,
5351                 char *host, socklen_t hostlen,
5352                 char *serv, socklen_t servlen,
5353                 unsigned int flags)
5354 #else
5355 int getnameinfo(const struct sockaddr *sa, socklen_t salen,
5356                 char *host, size_t hostlen,
5357                 char *serv, size_t servlen,
5358                 int flags)
5359 #endif
5360 {
5361         if (!nss_wrapper_hosts_enabled()) {
5362                 return libc_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
5363         }
5364
5365         return nwrap_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
5366 }
5367
5368 static int nwrap_gethostname(char *name, size_t len)
5369 {
5370         const char *hostname = getenv("NSS_WRAPPER_HOSTNAME");
5371
5372         if (strlen(hostname) >= len) {
5373                 errno = ENAMETOOLONG;
5374                 return -1;
5375         }
5376         snprintf(name, len, "%s", hostname);
5377
5378         return 0;
5379 }
5380
5381 #ifdef HAVE_SOLARIS_GETHOSTNAME
5382 int gethostname(char *name, int len)
5383 #else /* HAVE_SOLARIS_GETHOSTNAME */
5384 int gethostname(char *name, size_t len)
5385 #endif /* HAVE_SOLARIS_GETHOSTNAME */
5386 {
5387         if (!nwrap_hostname_enabled()) {
5388                 return libc_gethostname(name, len);
5389         }
5390
5391         return nwrap_gethostname(name, len);
5392 }
5393
5394 /****************************
5395  * DESTRUCTOR
5396  ***************************/
5397
5398 /*
5399  * This function is called when the library is unloaded and makes sure that
5400  * sockets get closed and the unix file for the socket are unlinked.
5401  */
5402 void nwrap_destructor(void)
5403 {
5404         int i;
5405
5406         NWRAP_LOCK_ALL;
5407         if (nwrap_main_global != NULL) {
5408                 struct nwrap_main *m = nwrap_main_global;
5409
5410                 /* libc */
5411                 SAFE_FREE(m->libc->fns);
5412                 if (m->libc->handle != NULL) {
5413                         dlclose(m->libc->handle);
5414                 }
5415                 if (m->libc->nsl_handle != NULL) {
5416                         dlclose(m->libc->nsl_handle);
5417                 }
5418                 if (m->libc->sock_handle != NULL) {
5419                         dlclose(m->libc->sock_handle);
5420                 }
5421                 SAFE_FREE(m->libc);
5422
5423                 /* backends */
5424                 for (i = 0; i < m->num_backends; i++) {
5425                         struct nwrap_backend *b = &(m->backends[i]);
5426
5427                         if (b->so_handle != NULL) {
5428                                 dlclose(b->so_handle);
5429                         }
5430                         SAFE_FREE(b->fns);
5431                 }
5432                 SAFE_FREE(m->backends);
5433         }
5434
5435         if (nwrap_pw_global.cache != NULL) {
5436                 struct nwrap_cache *c = nwrap_pw_global.cache;
5437
5438                 nwrap_files_cache_unload(c);
5439                 if (c->fd >= 0) {
5440                         fclose(c->fp);
5441                         c->fd = -1;
5442                 }
5443
5444                 SAFE_FREE(nwrap_pw_global.list);
5445                 nwrap_pw_global.num = 0;
5446         }
5447
5448         if (nwrap_gr_global.cache != NULL) {
5449                 struct nwrap_cache *c = nwrap_gr_global.cache;
5450
5451                 nwrap_files_cache_unload(c);
5452                 if (c->fd >= 0) {
5453                         fclose(c->fp);
5454                         c->fd = -1;
5455                 }
5456
5457                 SAFE_FREE(nwrap_gr_global.list);
5458                 nwrap_pw_global.num = 0;
5459         }
5460
5461         if (nwrap_he_global.cache != NULL) {
5462                 struct nwrap_cache *c = nwrap_he_global.cache;
5463
5464                 nwrap_files_cache_unload(c);
5465                 if (c->fd >= 0) {
5466                         fclose(c->fp);
5467                         c->fd = -1;
5468                 }
5469
5470                 nwrap_he_global.num = 0;
5471         }
5472
5473         hdestroy();
5474         NWRAP_UNLOCK_ALL;
5475 }