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         el = nwrap_entlist_init(ed);
2575         if (el == NULL) {
2576                 return false;
2577         }
2578
2579         e.key = ip_addr;
2580         e.data = el;
2581
2582         p = hsearch(e, ENTER);
2583         if (p == NULL) {
2584                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Hash table is full");
2585                 return false;
2586         }
2587
2588         return true;
2589 }
2590
2591
2592 static bool nwrap_add_hname_add_new(char *const h_name,
2593                                     struct nwrap_entdata *const ed)
2594 {
2595         ENTRY e;
2596         ENTRY *p;
2597         struct nwrap_entlist *el;
2598
2599         el = nwrap_entlist_init(ed);
2600         if (el == NULL) {
2601                 return false;
2602         }
2603
2604         e.key = h_name;
2605         e.data = (void *)el;
2606
2607         p = hsearch(e, ENTER);
2608         if (p == NULL) {
2609                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Hash table is full!");
2610                 return false;
2611         }
2612
2613         return true;
2614 }
2615
2616 static void nwrap_add_hname_add_to_existing(struct nwrap_entdata *const ed,
2617                                             struct nwrap_entlist *const el)
2618 {
2619         struct nwrap_entlist *cursor;
2620         struct nwrap_entlist *el_new;
2621
2622         el_new = nwrap_entlist_init(ed);
2623         if (el_new == NULL) {
2624                 return;
2625         }
2626
2627         for (cursor = el; cursor->next != NULL; cursor = cursor->next)
2628         {
2629                 if (cursor->ed == ed) {
2630                         free(el_new);
2631                         return;
2632                 }
2633         }
2634
2635         if (cursor->ed == ed) {
2636                 free(el_new);
2637                 return;
2638         }
2639
2640         cursor->next = el_new;
2641 }
2642
2643 static bool nwrap_add_hname_alias(char *const h_name_a,
2644                                   struct nwrap_entdata *const ed)
2645 {
2646         ENTRY e;
2647         ENTRY *p;
2648
2649         assert(ed != NULL);
2650         assert(h_name_a != NULL);
2651
2652         e.key = h_name_a;
2653         e.data = NULL;
2654         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching name: %s", e.key);
2655         p = hsearch(e, FIND);
2656         if (p == NULL) {
2657                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found. Adding...", h_name_a);
2658                 nwrap_add_hname_add_new(h_name_a, ed);
2659         } else {
2660                 struct nwrap_entlist *el = (struct nwrap_entlist *)p->data;
2661
2662                 assert(p->data != NULL);
2663                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s found. Add record to list.", h_name_a);
2664                 nwrap_add_hname_add_to_existing(ed, el);
2665         }
2666
2667         return true;
2668 }
2669
2670 static bool nwrap_add_hname(struct nwrap_entdata *const ed)
2671 {
2672         char *const h_name = (char *const)(ed->ht.h_name);
2673         ENTRY e;
2674         ENTRY *p;
2675         unsigned i;
2676
2677         assert(ed != NULL);
2678         assert(h_name != NULL);
2679
2680         e.key = h_name;
2681         e.data = NULL;
2682         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching name: %s", e.key);
2683         p = hsearch(e, FIND);
2684         if (p == NULL) {
2685                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found. Adding...", h_name);
2686                 nwrap_add_hname_add_new(h_name, ed);
2687         } else {
2688                 struct nwrap_entlist *el = (struct nwrap_entlist *)p->data;
2689
2690                 assert(p->data != NULL);
2691                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s found. Add record to list.", h_name);
2692                 nwrap_add_hname_add_to_existing(ed, el);
2693         }
2694
2695         if (ed->ht.h_aliases == NULL) {
2696                 return true;
2697         }
2698
2699         /* Itemize aliases */
2700         for (i = 0; ed->ht.h_aliases[i] != NULL; ++i) {
2701                 char *h_name_alias;
2702
2703                 h_name_alias = ed->ht.h_aliases[i];
2704                 assert(h_name_alias != NULL);
2705
2706                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Add alias: %s", h_name_alias);
2707
2708                 if (!nwrap_add_hname_alias(h_name_alias, ed)) {
2709                         NWRAP_LOG(NWRAP_LOG_DEBUG,
2710                                   "Unable to add alias: %s", h_name_alias);
2711                 }
2712         }
2713
2714         return true;
2715 }
2716
2717 static bool nwrap_he_parse_line(struct nwrap_cache *nwrap, char *line)
2718 {
2719         struct nwrap_he *nwrap_he = (struct nwrap_he *)nwrap->private_data;
2720         bool do_aliases = true;
2721         ssize_t aliases_count = 0;
2722         char *p;
2723         char *i;
2724         char *n;
2725
2726         char *ip;
2727
2728         struct nwrap_entdata *ed = (struct nwrap_entdata *)
2729                                    malloc(sizeof(struct nwrap_entdata));
2730         if (ed == NULL) {
2731                 NWRAP_LOG(NWRAP_LOG_ERROR,
2732                           "Unable to allocate memory for nwrap_entdata");
2733                 return false;
2734         }
2735         ZERO_STRUCTP(ed);
2736
2737         i = line;
2738
2739         /*
2740          * IP
2741          */
2742
2743         /* Walk to first char */
2744         for (p = i; *p != '.' && *p != ':' && !isxdigit((int) *p); p++) {
2745                 if (*p == '\0') {
2746                         NWRAP_LOG(NWRAP_LOG_ERROR,
2747                                   "Invalid line[%s]: '%s'",
2748                                   line, i);
2749                         free(ed);
2750                         return false;
2751                 }
2752         }
2753
2754         for (i = p; !isspace((int)*p); p++) {
2755                 if (*p == '\0') {
2756                         NWRAP_LOG(NWRAP_LOG_ERROR,
2757                                   "Invalid line[%s]: '%s'",
2758                                   line, i);
2759                         free(ed);
2760                         return false;
2761                 }
2762         }
2763
2764         *p = '\0';
2765
2766         if (inet_pton(AF_INET, i, ed->addr.host_addr)) {
2767                 ed->ht.h_addrtype = AF_INET;
2768                 ed->ht.h_length = 4;
2769 #ifdef HAVE_IPV6
2770         } else if (inet_pton(AF_INET6, i, ed->addr.host_addr)) {
2771                 ed->ht.h_addrtype = AF_INET6;
2772                 ed->ht.h_length = 16;
2773 #endif
2774         } else {
2775                 NWRAP_LOG(NWRAP_LOG_ERROR,
2776                           "Invalid line[%s]: '%s'",
2777                           line, i);
2778
2779                 free(ed);
2780                 return false;
2781         }
2782         ip = i;
2783
2784         nwrap_vector_add_item(&(ed->nwrap_addrdata),
2785                               (void *const)ed->addr.host_addr);
2786         ed->ht.h_addr_list = nwrap_vector_head(&ed->nwrap_addrdata);
2787
2788         p++;
2789
2790         /*
2791          * FQDN
2792          */
2793
2794         /* Walk to first char */
2795         for (n = p; *p != '_' && !isalnum((int) *p); p++) {
2796                 if (*p == '\0') {
2797                         NWRAP_LOG(NWRAP_LOG_ERROR,
2798                                   "Invalid line[%s]: '%s'",
2799                                   line, n);
2800
2801                         free(ed);
2802                         return false;
2803                 }
2804         }
2805
2806         for (n = p; !isspace((int)*p); p++) {
2807                 if (*p == '\0') {
2808                         do_aliases = false;
2809                         break;
2810                 }
2811         }
2812
2813         *p = '\0';
2814
2815         /* Convert to lowercase. This operate on same memory region */
2816         str_tolower(n, n);
2817         ed->ht.h_name = n;
2818
2819         /* glib's getent always dereferences he->h_aliases */
2820         ed->ht.h_aliases = malloc(sizeof(char *));
2821         if (ed->ht.h_aliases == NULL) {
2822                 free(ed);
2823                 return false;
2824         }
2825         ed->ht.h_aliases[0] = NULL;
2826
2827         /*
2828          * Aliases
2829          */
2830         while (do_aliases) {
2831                 char **aliases;
2832                 char *a;
2833
2834                 p++;
2835
2836                 /* Walk to first char */
2837                 for (a = p; *p != '_' && !isalnum((int) *p); p++) {
2838                         if (*p == '\0') {
2839                                 do_aliases = false;
2840                                 break;
2841                         }
2842                 }
2843                 /* Only trailing spaces are left */
2844                 if (!do_aliases) {
2845                         break;
2846                 }
2847
2848                 for (a = p; !isspace((int)*p); p++) {
2849                         if (*p == '\0') {
2850                                 do_aliases = false;
2851                                 break;
2852                         }
2853                 }
2854
2855                 *p = '\0';
2856
2857                 aliases = realloc(ed->ht.h_aliases, sizeof(char *) * (aliases_count + 2));
2858                 if (aliases == NULL) {
2859                         free(ed);
2860                         return false;
2861                 }
2862                 ed->ht.h_aliases = aliases;
2863
2864                 str_tolower(a, a);
2865                 aliases[aliases_count] = a;
2866                 aliases[aliases_count + 1] = NULL;
2867
2868                 aliases_count += 1;
2869         }
2870
2871         nwrap_vector_add_item(&(nwrap_he->entdata), (void *const)ed);
2872
2873         ed->aliases_count = aliases_count;
2874         /* Inventarize item */
2875         nwrap_add_hname(ed);
2876         nwrap_add_ai(ip, ed);
2877
2878         nwrap_he->num++;
2879         return true;
2880 }
2881
2882 static void nwrap_he_unload(struct nwrap_cache *nwrap)
2883 {
2884         struct nwrap_he *nwrap_he =
2885                 (struct nwrap_he *)nwrap->private_data;
2886         struct nwrap_entdata *ed;
2887         size_t i;
2888
2889         nwrap_vector_foreach (ed, nwrap_he->entdata, i)
2890         {
2891                 SAFE_FREE(ed->nwrap_addrdata.items);
2892                 SAFE_FREE(ed->ht.h_aliases);
2893                 SAFE_FREE(ed);
2894         }
2895         SAFE_FREE(nwrap_he->entdata.items);
2896         nwrap_he->entdata.count = nwrap_he->entdata.capacity = 0;
2897
2898         nwrap_he->num = 0;
2899         nwrap_he->idx = 0;
2900 }
2901
2902
2903 /* user functions */
2904 static struct passwd *nwrap_files_getpwnam(struct nwrap_backend *b,
2905                                            const char *name)
2906 {
2907         int i;
2908
2909         (void) b; /* unused */
2910
2911         NWRAP_LOG(NWRAP_LOG_DEBUG, "Lookup user %s in files", name);
2912
2913         nwrap_files_cache_reload(nwrap_pw_global.cache);
2914
2915         for (i=0; i<nwrap_pw_global.num; i++) {
2916                 if (strcmp(nwrap_pw_global.list[i].pw_name, name) == 0) {
2917                         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] found", name);
2918                         return &nwrap_pw_global.list[i];
2919                 }
2920                 NWRAP_LOG(NWRAP_LOG_DEBUG,
2921                           "user[%s] does not match [%s]",
2922                           name,
2923                           nwrap_pw_global.list[i].pw_name);
2924         }
2925
2926         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] not found\n", name);
2927
2928         errno = ENOENT;
2929         return NULL;
2930 }
2931
2932 static int nwrap_files_getpwnam_r(struct nwrap_backend *b,
2933                                   const char *name, struct passwd *pwdst,
2934                                   char *buf, size_t buflen, struct passwd **pwdstp)
2935 {
2936         struct passwd *pw;
2937
2938         pw = nwrap_files_getpwnam(b, name);
2939         if (!pw) {
2940                 if (errno == 0) {
2941                         return ENOENT;
2942                 }
2943                 return errno;
2944         }
2945
2946         return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
2947 }
2948
2949 static struct passwd *nwrap_files_getpwuid(struct nwrap_backend *b,
2950                                            uid_t uid)
2951 {
2952         int i;
2953
2954         (void) b; /* unused */
2955
2956         nwrap_files_cache_reload(nwrap_pw_global.cache);
2957
2958         for (i=0; i<nwrap_pw_global.num; i++) {
2959                 if (nwrap_pw_global.list[i].pw_uid == uid) {
2960                         NWRAP_LOG(NWRAP_LOG_DEBUG, "uid[%u] found", uid);
2961                         return &nwrap_pw_global.list[i];
2962                 }
2963                 NWRAP_LOG(NWRAP_LOG_DEBUG,
2964                           "uid[%u] does not match [%u]",
2965                           uid,
2966                           nwrap_pw_global.list[i].pw_uid);
2967         }
2968
2969         NWRAP_LOG(NWRAP_LOG_DEBUG, "uid[%u] not found\n", uid);
2970
2971         errno = ENOENT;
2972         return NULL;
2973 }
2974
2975 static int nwrap_files_getpwuid_r(struct nwrap_backend *b,
2976                                   uid_t uid, struct passwd *pwdst,
2977                                   char *buf, size_t buflen, struct passwd **pwdstp)
2978 {
2979         struct passwd *pw;
2980
2981         pw = nwrap_files_getpwuid(b, uid);
2982         if (!pw) {
2983                 if (errno == 0) {
2984                         return ENOENT;
2985                 }
2986                 return errno;
2987         }
2988
2989         return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
2990 }
2991
2992 /* user enum functions */
2993 static void nwrap_files_setpwent(struct nwrap_backend *b)
2994 {
2995         (void) b; /* unused */
2996
2997         nwrap_pw_global.idx = 0;
2998 }
2999
3000 static struct passwd *nwrap_files_getpwent(struct nwrap_backend *b)
3001 {
3002         struct passwd *pw;
3003
3004         (void) b; /* unused */
3005
3006         if (nwrap_pw_global.idx == 0) {
3007                 nwrap_files_cache_reload(nwrap_pw_global.cache);
3008         }
3009
3010         if (nwrap_pw_global.idx >= nwrap_pw_global.num) {
3011                 errno = ENOENT;
3012                 return NULL;
3013         }
3014
3015         pw = &nwrap_pw_global.list[nwrap_pw_global.idx++];
3016
3017         NWRAP_LOG(NWRAP_LOG_DEBUG,
3018                   "return user[%s] uid[%u]",
3019                   pw->pw_name, pw->pw_uid);
3020
3021         return pw;
3022 }
3023
3024 static int nwrap_files_getpwent_r(struct nwrap_backend *b,
3025                                   struct passwd *pwdst, char *buf,
3026                                   size_t buflen, struct passwd **pwdstp)
3027 {
3028         struct passwd *pw;
3029
3030         pw = nwrap_files_getpwent(b);
3031         if (!pw) {
3032                 if (errno == 0) {
3033                         return ENOENT;
3034                 }
3035                 return errno;
3036         }
3037
3038         return nwrap_pw_copy_r(pw, pwdst, buf, buflen, pwdstp);
3039 }
3040
3041 static void nwrap_files_endpwent(struct nwrap_backend *b)
3042 {
3043         (void) b; /* unused */
3044
3045         nwrap_pw_global.idx = 0;
3046 }
3047
3048 /* shadow */
3049
3050 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
3051
3052 #ifdef HAVE_SETSPENT
3053 static void nwrap_files_setspent(void)
3054 {
3055         nwrap_sp_global.idx = 0;
3056 }
3057
3058 static struct spwd *nwrap_files_getspent(void)
3059 {
3060         struct spwd *sp;
3061
3062         if (nwrap_sp_global.idx == 0) {
3063                 nwrap_files_cache_reload(nwrap_sp_global.cache);
3064         }
3065
3066         if (nwrap_sp_global.idx >= nwrap_sp_global.num) {
3067                 errno = ENOENT;
3068                 return NULL;
3069         }
3070
3071         sp = &nwrap_sp_global.list[nwrap_sp_global.idx++];
3072
3073         NWRAP_LOG(NWRAP_LOG_DEBUG,
3074                   "return user[%s]",
3075                   sp->sp_namp);
3076
3077         return sp;
3078 }
3079
3080 static void nwrap_files_endspent(void)
3081 {
3082         nwrap_sp_global.idx = 0;
3083 }
3084 #endif /* HAVE_SETSPENT */
3085
3086 static struct spwd *nwrap_files_getspnam(const char *name)
3087 {
3088         int i;
3089
3090         NWRAP_LOG(NWRAP_LOG_DEBUG, "Lookup user %s in files", name);
3091
3092         nwrap_files_cache_reload(nwrap_sp_global.cache);
3093
3094         for (i=0; i<nwrap_sp_global.num; i++) {
3095                 if (strcmp(nwrap_sp_global.list[i].sp_namp, name) == 0) {
3096                         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] found", name);
3097                         return &nwrap_sp_global.list[i];
3098                 }
3099                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3100                           "user[%s] does not match [%s]",
3101                           name,
3102                           nwrap_sp_global.list[i].sp_namp);
3103         }
3104
3105         NWRAP_LOG(NWRAP_LOG_DEBUG, "user[%s] not found\n", name);
3106
3107         errno = ENOENT;
3108         return NULL;
3109 }
3110 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
3111
3112 /* misc functions */
3113 static int nwrap_files_initgroups(struct nwrap_backend *b,
3114                                   const char *user,
3115                                   gid_t group)
3116 {
3117         struct group *grp;
3118         gid_t *groups;
3119         int size = 1;
3120         int rc;
3121
3122         groups = (gid_t *)malloc(size * sizeof(gid_t));
3123         if (groups == NULL) {
3124                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
3125                 errno = ENOMEM;
3126                 return -1;
3127         }
3128         groups[0] = group;
3129
3130         nwrap_files_setgrent(b);
3131         while ((grp = nwrap_files_getgrent(b)) != NULL) {
3132                 int i = 0;
3133
3134                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3135                           "Inspecting %s for group membership",
3136                           grp->gr_name);
3137
3138                 for (i=0; grp->gr_mem && grp->gr_mem[i] != NULL; i++) {
3139                         if (group != grp->gr_gid &&
3140                             (strcmp(user, grp->gr_mem[i]) == 0)) {
3141                                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3142                                           "%s is member of %s",
3143                                           user,
3144                                           grp->gr_name);
3145
3146                                 groups = (gid_t *)realloc(groups,
3147                                                           (size + 1) * sizeof(gid_t));
3148                                 if (groups == NULL) {
3149                                         NWRAP_LOG(NWRAP_LOG_ERROR,
3150                                                   "Out of memory");
3151                                         errno = ENOMEM;
3152                                         return -1;
3153                                 }
3154
3155                                 groups[size] = grp->gr_gid;
3156                                 size++;
3157                         }
3158                 }
3159         }
3160
3161         nwrap_files_endgrent(b);
3162
3163         NWRAP_LOG(NWRAP_LOG_DEBUG,
3164                   "%s is member of %d groups",
3165                   user, size);
3166
3167         /* This really only works if uid_wrapper is loaded */
3168         rc = setgroups(size, groups);
3169
3170         free(groups);
3171
3172         return rc;
3173 }
3174
3175 /* group functions */
3176 static struct group *nwrap_files_getgrnam(struct nwrap_backend *b,
3177                                           const char *name)
3178 {
3179         int i;
3180
3181         (void) b; /* unused */
3182
3183         nwrap_files_cache_reload(nwrap_gr_global.cache);
3184
3185         for (i=0; i<nwrap_gr_global.num; i++) {
3186                 if (strcmp(nwrap_gr_global.list[i].gr_name, name) == 0) {
3187                         NWRAP_LOG(NWRAP_LOG_DEBUG, "group[%s] found", name);
3188                         return &nwrap_gr_global.list[i];
3189                 }
3190                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3191                           "group[%s] does not match [%s]",
3192                           name,
3193                           nwrap_gr_global.list[i].gr_name);
3194         }
3195
3196         NWRAP_LOG(NWRAP_LOG_DEBUG, "group[%s] not found", name);
3197
3198         errno = ENOENT;
3199         return NULL;
3200 }
3201
3202 static int nwrap_files_getgrnam_r(struct nwrap_backend *b,
3203                                   const char *name, struct group *grdst,
3204                                   char *buf, size_t buflen, struct group **grdstp)
3205 {
3206         struct group *gr;
3207
3208         gr = nwrap_files_getgrnam(b, name);
3209         if (!gr) {
3210                 if (errno == 0) {
3211                         return ENOENT;
3212                 }
3213                 return errno;
3214         }
3215
3216         return nwrap_gr_copy_r(gr, grdst, buf, buflen, grdstp);
3217 }
3218
3219 static struct group *nwrap_files_getgrgid(struct nwrap_backend *b,
3220                                           gid_t gid)
3221 {
3222         int i;
3223
3224         (void) b; /* unused */
3225
3226         nwrap_files_cache_reload(nwrap_gr_global.cache);
3227
3228         for (i=0; i<nwrap_gr_global.num; i++) {
3229                 if (nwrap_gr_global.list[i].gr_gid == gid) {
3230                         NWRAP_LOG(NWRAP_LOG_DEBUG, "gid[%u] found", gid);
3231                         return &nwrap_gr_global.list[i];
3232                 }
3233                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3234                           "gid[%u] does not match [%u]",
3235                           gid,
3236                           nwrap_gr_global.list[i].gr_gid);
3237         }
3238
3239         NWRAP_LOG(NWRAP_LOG_DEBUG, "gid[%u] not found", gid);
3240
3241         errno = ENOENT;
3242         return NULL;
3243 }
3244
3245 static int nwrap_files_getgrgid_r(struct nwrap_backend *b,
3246                                   gid_t gid, struct group *grdst,
3247                                   char *buf, size_t buflen, struct group **grdstp)
3248 {
3249         struct group *gr;
3250
3251         gr = nwrap_files_getgrgid(b, gid);
3252         if (!gr) {
3253                 if (errno == 0) {
3254                         return ENOENT;
3255                 }
3256                 return errno;
3257         }
3258
3259         return nwrap_gr_copy_r(gr, grdst, buf, buflen, grdstp);
3260 }
3261
3262 /* group enum functions */
3263 static void nwrap_files_setgrent(struct nwrap_backend *b)
3264 {
3265         (void) b; /* unused */
3266
3267         nwrap_gr_global.idx = 0;
3268 }
3269
3270 static struct group *nwrap_files_getgrent(struct nwrap_backend *b)
3271 {
3272         struct group *gr;
3273
3274         (void) b; /* unused */
3275
3276         if (nwrap_gr_global.idx == 0) {
3277                 nwrap_files_cache_reload(nwrap_gr_global.cache);
3278         }
3279
3280         if (nwrap_gr_global.idx >= nwrap_gr_global.num) {
3281                 errno = ENOENT;
3282                 return NULL;
3283         }
3284
3285         gr = &nwrap_gr_global.list[nwrap_gr_global.idx++];
3286
3287         NWRAP_LOG(NWRAP_LOG_DEBUG,
3288                   "return group[%s] gid[%u]",
3289                   gr->gr_name, gr->gr_gid);
3290
3291         return gr;
3292 }
3293
3294 static int nwrap_files_getgrent_r(struct nwrap_backend *b,
3295                                   struct group *grdst, char *buf,
3296                                   size_t buflen, struct group **grdstp)
3297 {
3298         struct group *gr;
3299
3300         gr = nwrap_files_getgrent(b);
3301         if (!gr) {
3302                 if (errno == 0) {
3303                         return ENOENT;
3304                 }
3305                 return errno;
3306         }
3307
3308         return nwrap_gr_copy_r(gr, grdst, buf, buflen, grdstp);
3309 }
3310
3311 static void nwrap_files_endgrent(struct nwrap_backend *b)
3312 {
3313         (void) b; /* unused */
3314
3315         nwrap_gr_global.idx = 0;
3316 }
3317
3318 /* hosts functions */
3319 static int nwrap_files_gethostbyname(const char *name, int af,
3320                                      struct hostent *result,
3321                                      struct nwrap_vector *addr_list)
3322 {
3323         struct nwrap_entlist *el_head;
3324         struct nwrap_entlist *el_cur;
3325         struct hostent *he;
3326         char *h_name_lower;
3327         ENTRY e;
3328         ENTRY *e_p;
3329         char canon_name[DNS_NAME_MAX] = { 0 };
3330         size_t name_len;
3331         bool he_found = false;
3332
3333         nwrap_files_cache_reload(nwrap_he_global.cache);
3334
3335         name_len = strlen(name);
3336         if (name_len < sizeof(canon_name) && name[name_len - 1] == '.') {
3337                 strncpy(canon_name, name, name_len - 1);
3338                 name = canon_name;
3339         }
3340
3341         if (!str_tolower_copy(&h_name_lower, name)) {
3342                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3343                           "Out of memory while converting to lower case");
3344                 goto no_ent;
3345         }
3346
3347         /* Look at hash table for element */
3348         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching for name: %s", h_name_lower);
3349         e.key = h_name_lower;
3350         e.data = NULL;
3351         e_p = hsearch(e, FIND);
3352         if (e_p == NULL) {
3353                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found.", h_name_lower);
3354                 SAFE_FREE(h_name_lower);
3355                 goto no_ent;
3356         }
3357         SAFE_FREE(h_name_lower);
3358
3359         /* Always cleanup vector and results */
3360         if (!nwrap_vector_is_initialized(addr_list)) {
3361                 if (!nwrap_vector_init(addr_list)) {
3362                         NWRAP_LOG(NWRAP_LOG_DEBUG,
3363                                   "Unable to initialize memory for addr_list vector");
3364                         goto no_ent;
3365                 }
3366         } else {
3367                 /* When vector is initialized data are valid no more.
3368                  * Quick way how to free vector is: */
3369                 addr_list->count = 0;
3370         }
3371
3372         /* Iterate through results */
3373         el_head = (struct nwrap_entlist *)e_p->data;
3374         for (el_cur = el_head; el_cur != NULL; el_cur = el_cur->next) {
3375                 he = &(el_cur->ed->ht);
3376
3377                 /* Filter by address familiy if provided */
3378                 if (af != AF_UNSPEC && he->h_addrtype != af) {
3379                         continue;
3380                 }
3381
3382                 /*
3383                  * GLIBC HACK?
3384                  * glibc doesn't return ipv6 addresses when AF_UNSPEC is used
3385                  */
3386                 if (af == AF_UNSPEC && he->h_addrtype != AF_INET) {
3387                         continue;
3388                 }
3389
3390                 if (!he_found) {
3391                         memcpy(result, he, sizeof(struct hostent));
3392                         NWRAP_LOG(NWRAP_LOG_DEBUG,
3393                                   "Name found. Returning record for %s",
3394                                   he->h_name);
3395                         he_found = true;
3396                 }
3397                 nwrap_vector_merge(addr_list, &el_cur->ed->nwrap_addrdata);
3398                 result->h_addr_list = nwrap_vector_head(addr_list);
3399         }
3400
3401         if (he_found) {
3402                 return 0;
3403         }
3404         NWRAP_LOG(NWRAP_LOG_DEBUG,
3405                   "Name found in database. No records matches type.");
3406
3407 no_ent:
3408         errno = ENOENT;
3409         return -1;
3410 }
3411
3412 #ifdef HAVE_GETHOSTBYNAME_R
3413 static int nwrap_gethostbyname_r(const char *name,
3414                                  struct hostent *ret,
3415                                  char *buf, size_t buflen,
3416                                  struct hostent **result, int *h_errnop)
3417 {
3418         struct nwrap_vector *addr_list = malloc(sizeof(struct nwrap_vector));
3419         int rc;
3420
3421         if (addr_list == NULL) {
3422                 NWRAP_LOG(NWRAP_LOG_ERROR,
3423                           "Unable to allocate memory for address list");
3424                 errno = ENOENT;
3425                 return -1;
3426         }
3427
3428         ZERO_STRUCTP(addr_list);
3429
3430         rc = nwrap_files_gethostbyname(name, AF_UNSPEC, ret, addr_list);
3431         if (rc == -1) {
3432                 *h_errnop = h_errno;
3433                 if (addr_list->items != NULL) {
3434                         free(addr_list->items);
3435                 }
3436                 SAFE_FREE(addr_list);
3437                 errno = ENOENT;
3438                 return -1;
3439         }
3440
3441         if (buflen < (addr_list->count * sizeof(void *))) {
3442                 SAFE_FREE(addr_list->items);
3443                 SAFE_FREE(addr_list);
3444                 return ERANGE;
3445         }
3446
3447         /* Copy all to user provided buffer and change
3448          * pointers in returned structure.
3449          * +1 is for ending NULL pointer. */
3450         memcpy(buf, addr_list->items, (addr_list->count + 1) * sizeof(void *));
3451
3452         free(addr_list->items);
3453         free(addr_list);
3454
3455         ret->h_addr_list = (char **)buf;
3456         *result = ret;
3457         return 0;
3458 }
3459
3460 int gethostbyname_r(const char *name,
3461                     struct hostent *ret,
3462                     char *buf, size_t buflen,
3463                     struct hostent **result, int *h_errnop)
3464 {
3465         if (!nss_wrapper_hosts_enabled()) {
3466                 return libc_gethostbyname_r(name,
3467                                             ret,
3468                                             buf,
3469                                             buflen,
3470                                             result,
3471                                             h_errnop);
3472         }
3473
3474         return nwrap_gethostbyname_r(name, ret, buf, buflen, result, h_errnop);
3475 }
3476 #endif
3477
3478 static struct addrinfo *nwrap_files_getaddrinfo(const char *name,
3479                                                 unsigned short port,
3480                                                 const struct addrinfo *hints,
3481                                                 struct addrinfo **ai_tail)
3482 {
3483         struct nwrap_entlist *el_head;
3484         struct nwrap_entlist *el_cur;
3485         struct hostent *he;
3486         struct addrinfo *ai = NULL;
3487         struct addrinfo *ai_head = NULL;
3488         struct addrinfo *ai_prev = NULL;
3489         char *h_name_lower;
3490         size_t name_len;
3491         char canon_name[DNS_NAME_MAX] = { 0 };
3492         bool skip_canonname = false;
3493         ENTRY e = { 0 };
3494         ENTRY *e_p = NULL;
3495
3496         nwrap_files_cache_reload(nwrap_he_global.cache);
3497
3498         name_len = strlen(name);
3499         if (name_len < DNS_NAME_MAX && name[name_len - 1] == '.') {
3500                 strncpy(canon_name, name, name_len - 1);
3501                 name = canon_name;
3502         }
3503
3504         if (!str_tolower_copy(&h_name_lower, name)) {
3505                 NWRAP_LOG(NWRAP_LOG_DEBUG,
3506                           "Out of memory while converting to lower case");
3507                 return NULL;
3508         }
3509
3510         NWRAP_LOG(NWRAP_LOG_DEBUG, "Searching for name: %s", h_name_lower);
3511         e.key = h_name_lower;
3512         e.data = NULL;
3513         e_p = hsearch(e, FIND);
3514         if (e_p == NULL) {
3515                 NWRAP_LOG(NWRAP_LOG_DEBUG, "Name %s not found.", h_name_lower);
3516                 SAFE_FREE(h_name_lower);
3517                 errno = ENOENT;
3518                 return NULL;
3519         }
3520         NWRAP_LOG(NWRAP_LOG_DEBUG, "Name: %s found.", h_name_lower);
3521         SAFE_FREE(h_name_lower);
3522
3523         el_head = (struct nwrap_entlist *)e_p->data;
3524
3525         for (el_cur = el_head; el_cur != NULL; el_cur = el_cur->next) {
3526                 int rc;
3527
3528                 he = &(el_cur->ed->ht);
3529
3530                 if (hints->ai_family != AF_UNSPEC &&
3531                     he->h_addrtype != hints->ai_family) {
3532                         continue;
3533                 }
3534
3535                 /* Function allocates memory and returns it in ai. */
3536                 rc = nwrap_convert_he_ai(he,
3537                                          port,
3538                                          hints,
3539                                          &ai,
3540                                          skip_canonname);
3541                 if (rc != 0) {
3542                         /* FIXME: Investigate if this is nice to do... */
3543                         NWRAP_LOG(NWRAP_LOG_ERROR,
3544                                   "Error in converting he to ai! Skipping.");
3545                         continue;
3546                 }
3547                 skip_canonname = true;
3548
3549                 if (ai_head == NULL) {
3550                         ai_head = ai;
3551                 }
3552                 if (ai_prev != NULL) {
3553                         ai_prev->ai_next = ai;
3554                 }
3555                 ai_prev = ai;
3556         }
3557
3558         *ai_tail = ai;
3559         return ai_head;
3560 }
3561
3562 static struct hostent *nwrap_files_gethostbyaddr(const void *addr,
3563                                                  socklen_t len, int type)
3564 {
3565         struct hostent *he;
3566         char ip[NWRAP_INET_ADDRSTRLEN] = {0};
3567         struct nwrap_entdata *ed;
3568         const char *a;
3569         size_t i;
3570
3571         (void) len; /* unused */
3572
3573         nwrap_files_cache_reload(nwrap_he_global.cache);
3574
3575         a = inet_ntop(type, addr, ip, sizeof(ip));
3576         if (a == NULL) {
3577                 errno = EINVAL;
3578                 return NULL;
3579         }
3580
3581         nwrap_vector_foreach(ed, nwrap_he_global.entdata, i)
3582         {
3583                 he = &(ed->ht);
3584                 if (he->h_addrtype != type) {
3585                         continue;
3586                 }
3587
3588                 if (memcmp(addr, he->h_addr_list[0], he->h_length) == 0) {
3589                         return he;
3590                 }
3591         }
3592
3593         errno = ENOENT;
3594         return NULL;
3595 }
3596
3597 #ifdef HAVE_GETHOSTBYADDR_R
3598 static int nwrap_gethostbyaddr_r(const void *addr, socklen_t len, int type,
3599                                  struct hostent *ret,
3600                                  char *buf, size_t buflen,
3601                                  struct hostent **result, int *h_errnop)
3602 {
3603         *result = nwrap_files_gethostbyaddr(addr, len, type);
3604         if (*result != NULL) {
3605                 memset(buf, '\0', buflen);
3606                 *ret = **result;
3607                 return 0;
3608         } else {
3609                 *h_errnop = h_errno;
3610                 return -1;
3611         }
3612 }
3613
3614 int gethostbyaddr_r(const void *addr, socklen_t len, int type,
3615                     struct hostent *ret,
3616                     char *buf, size_t buflen,
3617                     struct hostent **result, int *h_errnop)
3618 {
3619         if (!nss_wrapper_hosts_enabled()) {
3620                 return libc_gethostbyaddr_r(addr,
3621                                             len,
3622                                             type,
3623                                             ret,
3624                                             buf,
3625                                             buflen,
3626                                             result,
3627                                             h_errnop);
3628         }
3629
3630         return nwrap_gethostbyaddr_r(addr, len, type, ret, buf, buflen, result, h_errnop);
3631 }
3632 #endif
3633
3634 /* hosts enum functions */
3635 static void nwrap_files_sethostent(void)
3636 {
3637         nwrap_he_global.idx = 0;
3638 }
3639
3640 static struct hostent *nwrap_files_gethostent(void)
3641 {
3642         struct hostent *he;
3643
3644         if (nwrap_he_global.idx == 0) {
3645                 nwrap_files_cache_reload(nwrap_he_global.cache);
3646         }
3647
3648         if (nwrap_he_global.idx >= nwrap_he_global.num) {
3649                 errno = ENOENT;
3650                 return NULL;
3651         }
3652
3653         he = &((struct nwrap_entdata *)nwrap_he_global.entdata.items[nwrap_he_global.idx++])->ht;
3654
3655         NWRAP_LOG(NWRAP_LOG_DEBUG, "return hosts[%s]", he->h_name);
3656
3657         return he;
3658 }
3659
3660 static void nwrap_files_endhostent(void)
3661 {
3662         nwrap_he_global.idx = 0;
3663 }
3664
3665 /*
3666  * module backend
3667  */
3668
3669
3670 static struct passwd *nwrap_module_getpwnam(struct nwrap_backend *b,
3671                                             const char *name)
3672 {
3673         static struct passwd pwd;
3674         static char buf[1000];
3675         NSS_STATUS status;
3676
3677         if (!b->fns->_nss_getpwnam_r) {
3678                 return NULL;
3679         }
3680
3681         status = b->fns->_nss_getpwnam_r(name, &pwd, buf, sizeof(buf), &errno);
3682         if (status == NSS_STATUS_NOTFOUND) {
3683                 return NULL;
3684         }
3685         if (status != NSS_STATUS_SUCCESS) {
3686                 return NULL;
3687         }
3688
3689         return &pwd;
3690 }
3691
3692 static int nwrap_module_getpwnam_r(struct nwrap_backend *b,
3693                                    const char *name, struct passwd *pwdst,
3694                                    char *buf, size_t buflen, struct passwd **pwdstp)
3695 {
3696         int ret;
3697
3698         (void) b; /* unused */
3699         (void) pwdst; /* unused */
3700         (void) pwdstp; /* unused */
3701
3702         if (!b->fns->_nss_getpwnam_r) {
3703                 return NSS_STATUS_NOTFOUND;
3704         }
3705
3706         ret = b->fns->_nss_getpwnam_r(name, pwdst, buf, buflen, &errno);
3707         switch (ret) {
3708         case NSS_STATUS_SUCCESS:
3709                 return 0;
3710         case NSS_STATUS_NOTFOUND:
3711                 if (errno != 0) {
3712                         return errno;
3713                 }
3714                 return ENOENT;
3715         case NSS_STATUS_TRYAGAIN:
3716                 if (errno != 0) {
3717                         return errno;
3718                 }
3719                 return ERANGE;
3720         default:
3721                 if (errno != 0) {
3722                         return errno;
3723                 }
3724                 return ret;
3725         }
3726 }
3727
3728 static struct passwd *nwrap_module_getpwuid(struct nwrap_backend *b,
3729                                             uid_t uid)
3730 {
3731         static struct passwd pwd;
3732         static char buf[1000];
3733         NSS_STATUS status;
3734
3735         if (!b->fns->_nss_getpwuid_r) {
3736                 return NULL;
3737         }
3738
3739         status = b->fns->_nss_getpwuid_r(uid, &pwd, buf, sizeof(buf), &errno);
3740         if (status == NSS_STATUS_NOTFOUND) {
3741                 return NULL;
3742         }
3743         if (status != NSS_STATUS_SUCCESS) {
3744                 return NULL;
3745         }
3746         return &pwd;
3747 }
3748
3749 static int nwrap_module_getpwuid_r(struct nwrap_backend *b,
3750                                    uid_t uid, struct passwd *pwdst,
3751                                    char *buf, size_t buflen, struct passwd **pwdstp)
3752 {
3753         int ret;
3754
3755         (void) pwdstp; /* unused */
3756
3757         if (!b->fns->_nss_getpwuid_r) {
3758                 return ENOENT;
3759         }
3760
3761         ret = b->fns->_nss_getpwuid_r(uid, pwdst, buf, buflen, &errno);
3762         switch (ret) {
3763         case NSS_STATUS_SUCCESS:
3764                 return 0;
3765         case NSS_STATUS_NOTFOUND:
3766                 if (errno != 0) {
3767                         return errno;
3768                 }
3769                 return ENOENT;
3770         case NSS_STATUS_TRYAGAIN:
3771                 if (errno != 0) {
3772                         return errno;
3773                 }
3774                 return ERANGE;
3775         default:
3776                 if (errno != 0) {
3777                         return errno;
3778                 }
3779                 return ret;
3780         }
3781 }
3782
3783 static void nwrap_module_setpwent(struct nwrap_backend *b)
3784 {
3785         if (!b->fns->_nss_setpwent) {
3786                 return;
3787         }
3788
3789         b->fns->_nss_setpwent();
3790 }
3791
3792 static struct passwd *nwrap_module_getpwent(struct nwrap_backend *b)
3793 {
3794         static struct passwd pwd;
3795         static char buf[1000];
3796         NSS_STATUS status;
3797
3798         if (!b->fns->_nss_getpwent_r) {
3799                 return NULL;
3800         }
3801
3802         status = b->fns->_nss_getpwent_r(&pwd, buf, sizeof(buf), &errno);
3803         if (status == NSS_STATUS_NOTFOUND) {
3804                 return NULL;
3805         }
3806         if (status != NSS_STATUS_SUCCESS) {
3807                 return NULL;
3808         }
3809         return &pwd;
3810 }
3811
3812 static int nwrap_module_getpwent_r(struct nwrap_backend *b,
3813                                    struct passwd *pwdst, char *buf,
3814                                    size_t buflen, struct passwd **pwdstp)
3815 {
3816         int ret;
3817
3818         (void) pwdstp; /* unused */
3819
3820         if (!b->fns->_nss_getpwent_r) {
3821                 return ENOENT;
3822         }
3823
3824         ret = b->fns->_nss_getpwent_r(pwdst, buf, buflen, &errno);
3825         switch (ret) {
3826         case NSS_STATUS_SUCCESS:
3827                 return 0;
3828         case NSS_STATUS_NOTFOUND:
3829                 if (errno != 0) {
3830                         return errno;
3831                 }
3832                 return ENOENT;
3833         case NSS_STATUS_TRYAGAIN:
3834                 if (errno != 0) {
3835                         return errno;
3836                 }
3837                 return ERANGE;
3838         default:
3839                 if (errno != 0) {
3840                         return errno;
3841                 }
3842                 return ret;
3843         }
3844 }
3845
3846 static void nwrap_module_endpwent(struct nwrap_backend *b)
3847 {
3848         if (!b->fns->_nss_endpwent) {
3849                 return;
3850         }
3851
3852         b->fns->_nss_endpwent();
3853 }
3854
3855 static int nwrap_module_initgroups(struct nwrap_backend *b,
3856                                    const char *user, gid_t group)
3857 {
3858         gid_t *groups;
3859         long int start;
3860         long int size;
3861
3862         if (!b->fns->_nss_initgroups) {
3863                 return NSS_STATUS_UNAVAIL;
3864         }
3865
3866         return b->fns->_nss_initgroups(user, group, &start, &size, &groups, 0, &errno);
3867 }
3868
3869 static struct group *nwrap_module_getgrnam(struct nwrap_backend *b,
3870                                            const char *name)
3871 {
3872         static struct group grp;
3873         static char *buf;
3874         static int buflen = 1000;
3875         NSS_STATUS status;
3876
3877         if (!b->fns->_nss_getgrnam_r) {
3878                 return NULL;
3879         }
3880
3881         if (!buf) {
3882                 buf = (char *)malloc(buflen);
3883         }
3884 again:
3885         status = b->fns->_nss_getgrnam_r(name, &grp, buf, buflen, &errno);
3886         if (status == NSS_STATUS_TRYAGAIN) {
3887                 buflen *= 2;
3888                 buf = (char *)realloc(buf, buflen);
3889                 if (!buf) {
3890                         return NULL;
3891                 }
3892                 goto again;
3893         }
3894         if (status == NSS_STATUS_NOTFOUND) {
3895                 SAFE_FREE(buf);
3896                 return NULL;
3897         }
3898         if (status != NSS_STATUS_SUCCESS) {
3899                 SAFE_FREE(buf);
3900                 return NULL;
3901         }
3902         return &grp;
3903 }
3904
3905 static int nwrap_module_getgrnam_r(struct nwrap_backend *b,
3906                                    const char *name, struct group *grdst,
3907                                    char *buf, size_t buflen, struct group **grdstp)
3908 {
3909         int ret;
3910
3911         (void) grdstp; /* unused */
3912
3913         if (!b->fns->_nss_getgrnam_r) {
3914                 return ENOENT;
3915         }
3916
3917         ret = b->fns->_nss_getgrnam_r(name, grdst, buf, buflen, &errno);
3918         switch (ret) {
3919         case NSS_STATUS_SUCCESS:
3920                 return 0;
3921         case NSS_STATUS_NOTFOUND:
3922                 if (errno != 0) {
3923                         return errno;
3924                 }
3925                 return ENOENT;
3926         case NSS_STATUS_TRYAGAIN:
3927                 if (errno != 0) {
3928                         return errno;
3929                 }
3930                 return ERANGE;
3931         default:
3932                 if (errno != 0) {
3933                         return errno;
3934                 }
3935                 return ret;
3936         }
3937 }
3938
3939 static struct group *nwrap_module_getgrgid(struct nwrap_backend *b,
3940                                            gid_t gid)
3941 {
3942         static struct group grp;
3943         static char *buf;
3944         static int buflen = 1000;
3945         NSS_STATUS status;
3946
3947         if (!b->fns->_nss_getgrgid_r) {
3948                 return NULL;
3949         }
3950
3951         if (!buf) {
3952                 buf = (char *)malloc(buflen);
3953         }
3954
3955 again:
3956         status = b->fns->_nss_getgrgid_r(gid, &grp, buf, buflen, &errno);
3957         if (status == NSS_STATUS_TRYAGAIN) {
3958                 buflen *= 2;
3959                 buf = (char *)realloc(buf, buflen);
3960                 if (!buf) {
3961                         return NULL;
3962                 }
3963                 goto again;
3964         }
3965         if (status == NSS_STATUS_NOTFOUND) {
3966                 SAFE_FREE(buf);
3967                 return NULL;
3968         }
3969         if (status != NSS_STATUS_SUCCESS) {
3970                 SAFE_FREE(buf);
3971                 return NULL;
3972         }
3973         return &grp;
3974 }
3975
3976 static int nwrap_module_getgrgid_r(struct nwrap_backend *b,
3977                                    gid_t gid, struct group *grdst,
3978                                    char *buf, size_t buflen, struct group **grdstp)
3979 {
3980         int ret;
3981
3982         (void) grdstp; /* unused */
3983
3984         if (!b->fns->_nss_getgrgid_r) {
3985                 return ENOENT;
3986         }
3987
3988         ret = b->fns->_nss_getgrgid_r(gid, grdst, buf, buflen, &errno);
3989         switch (ret) {
3990         case NSS_STATUS_SUCCESS:
3991                 return 0;
3992         case NSS_STATUS_NOTFOUND:
3993                 if (errno != 0) {
3994                         return errno;
3995                 }
3996                 return ENOENT;
3997         case NSS_STATUS_TRYAGAIN:
3998                 if (errno != 0) {
3999                         return errno;
4000                 }
4001                 return ERANGE;
4002         default:
4003                 if (errno != 0) {
4004                         return errno;
4005                 }
4006                 return ret;
4007         }
4008 }
4009
4010 static void nwrap_module_setgrent(struct nwrap_backend *b)
4011 {
4012         if (!b->fns->_nss_setgrent) {
4013                 return;
4014         }
4015
4016         b->fns->_nss_setgrent();
4017 }
4018
4019 static struct group *nwrap_module_getgrent(struct nwrap_backend *b)
4020 {
4021         static struct group grp;
4022         static char *buf;
4023         static int buflen = 1024;
4024         NSS_STATUS status;
4025
4026         if (!b->fns->_nss_getgrent_r) {
4027                 return NULL;
4028         }
4029
4030         if (!buf) {
4031                 buf = (char *)malloc(buflen);
4032         }
4033
4034 again:
4035         status = b->fns->_nss_getgrent_r(&grp, buf, buflen, &errno);
4036         if (status == NSS_STATUS_TRYAGAIN) {
4037                 buflen *= 2;
4038                 buf = (char *)realloc(buf, buflen);
4039                 if (!buf) {
4040                         return NULL;
4041                 }
4042                 goto again;
4043         }
4044         if (status == NSS_STATUS_NOTFOUND) {
4045                 SAFE_FREE(buf);
4046                 return NULL;
4047         }
4048         if (status != NSS_STATUS_SUCCESS) {
4049                 SAFE_FREE(buf);
4050                 return NULL;
4051         }
4052         return &grp;
4053 }
4054
4055 static int nwrap_module_getgrent_r(struct nwrap_backend *b,
4056                                    struct group *grdst, char *buf,
4057                                    size_t buflen, struct group **grdstp)
4058 {
4059         int ret;
4060
4061         (void) grdstp; /* unused */
4062
4063         if (!b->fns->_nss_getgrent_r) {
4064                 return ENOENT;
4065         }
4066
4067         ret = b->fns->_nss_getgrent_r(grdst, buf, buflen, &errno);
4068         switch (ret) {
4069         case NSS_STATUS_SUCCESS:
4070                 return 0;
4071         case NSS_STATUS_NOTFOUND:
4072                 if (errno != 0) {
4073                         return errno;
4074                 }
4075                 return ENOENT;
4076         case NSS_STATUS_TRYAGAIN:
4077                 if (errno != 0) {
4078                         return errno;
4079                 }
4080                 return ERANGE;
4081         default:
4082                 if (errno != 0) {
4083                         return errno;
4084                 }
4085                 return ret;
4086         }
4087 }
4088
4089 static void nwrap_module_endgrent(struct nwrap_backend *b)
4090 {
4091         if (!b->fns->_nss_endgrent) {
4092                 return;
4093         }
4094
4095         b->fns->_nss_endgrent();
4096 }
4097
4098 /****************************************************************************
4099  *   GETPWNAM
4100  ***************************************************************************/
4101
4102 static struct passwd *nwrap_getpwnam(const char *name)
4103 {
4104         int i;
4105         struct passwd *pwd;
4106
4107         for (i=0; i < nwrap_main_global->num_backends; i++) {
4108                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4109                 pwd = b->ops->nw_getpwnam(b, name);
4110                 if (pwd) {
4111                         return pwd;
4112                 }
4113         }
4114
4115         return NULL;
4116 }
4117
4118 struct passwd *getpwnam(const char *name)
4119 {
4120         if (!nss_wrapper_enabled()) {
4121                 return libc_getpwnam(name);
4122         }
4123
4124         return nwrap_getpwnam(name);
4125 }
4126
4127 /****************************************************************************
4128  *   GETPWNAM_R
4129  ***************************************************************************/
4130
4131 static int nwrap_getpwnam_r(const char *name, struct passwd *pwdst,
4132                             char *buf, size_t buflen, struct passwd **pwdstp)
4133 {
4134         int i,ret;
4135
4136         for (i=0; i < nwrap_main_global->num_backends; i++) {
4137                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4138                 ret = b->ops->nw_getpwnam_r(b, name, pwdst, buf, buflen, pwdstp);
4139                 if (ret == ENOENT) {
4140                         continue;
4141                 }
4142                 return ret;
4143         }
4144
4145         return ENOENT;
4146 }
4147
4148 #ifdef HAVE_GETPWNAM_R
4149 # ifdef HAVE_SOLARIS_GETPWNAM_R
4150 int getpwnam_r(const char *name, struct passwd *pwdst,
4151                char *buf, int buflen, struct passwd **pwdstp)
4152 # else /* HAVE_SOLARIS_GETPWNAM_R */
4153 int getpwnam_r(const char *name, struct passwd *pwdst,
4154                char *buf, size_t buflen, struct passwd **pwdstp)
4155 # endif /* HAVE_SOLARIS_GETPWNAM_R */
4156 {
4157         if (!nss_wrapper_enabled()) {
4158                 return libc_getpwnam_r(name, pwdst, buf, buflen, pwdstp);
4159         }
4160
4161         return nwrap_getpwnam_r(name, pwdst, buf, buflen, pwdstp);
4162 }
4163 #endif
4164
4165 /****************************************************************************
4166  *   GETPWUID
4167  ***************************************************************************/
4168
4169 static struct passwd *nwrap_getpwuid(uid_t uid)
4170 {
4171         int i;
4172         struct passwd *pwd;
4173
4174         for (i=0; i < nwrap_main_global->num_backends; i++) {
4175                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4176                 pwd = b->ops->nw_getpwuid(b, uid);
4177                 if (pwd) {
4178                         return pwd;
4179                 }
4180         }
4181
4182         return NULL;
4183 }
4184
4185 struct passwd *getpwuid(uid_t uid)
4186 {
4187         if (!nss_wrapper_enabled()) {
4188                 return libc_getpwuid(uid);
4189         }
4190
4191         return nwrap_getpwuid(uid);
4192 }
4193
4194 /****************************************************************************
4195  *   GETPWUID_R
4196  ***************************************************************************/
4197
4198 static int nwrap_getpwuid_r(uid_t uid, struct passwd *pwdst,
4199                             char *buf, size_t buflen, struct passwd **pwdstp)
4200 {
4201         int i,ret;
4202
4203         for (i=0; i < nwrap_main_global->num_backends; i++) {
4204                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4205                 ret = b->ops->nw_getpwuid_r(b, uid, pwdst, buf, buflen, pwdstp);
4206                 if (ret == ENOENT) {
4207                         continue;
4208                 }
4209                 return ret;
4210         }
4211
4212         return ENOENT;
4213 }
4214
4215 #ifdef HAVE_SOLARIS_GETPWUID_R
4216 int getpwuid_r(uid_t uid, struct passwd *pwdst,
4217                char *buf, int buflen, struct passwd **pwdstp)
4218 #else
4219 int getpwuid_r(uid_t uid, struct passwd *pwdst,
4220                char *buf, size_t buflen, struct passwd **pwdstp)
4221 #endif
4222 {
4223         if (!nss_wrapper_enabled()) {
4224                 return libc_getpwuid_r(uid, pwdst, buf, buflen, pwdstp);
4225         }
4226
4227         return nwrap_getpwuid_r(uid, pwdst, buf, buflen, pwdstp);
4228 }
4229
4230 /****************************************************************************
4231  *   SETPWENT
4232  ***************************************************************************/
4233
4234 static void nwrap_setpwent(void)
4235 {
4236         int i;
4237
4238         for (i=0; i < nwrap_main_global->num_backends; i++) {
4239                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4240                 b->ops->nw_setpwent(b);
4241         }
4242 }
4243
4244 void setpwent(void)
4245 {
4246         if (!nss_wrapper_enabled()) {
4247                 libc_setpwent();
4248                 return;
4249         }
4250
4251         nwrap_setpwent();
4252 }
4253
4254 /****************************************************************************
4255  *   GETPWENT
4256  ***************************************************************************/
4257
4258 static struct passwd *nwrap_getpwent(void)
4259 {
4260         int i;
4261         struct passwd *pwd;
4262
4263         for (i=0; i < nwrap_main_global->num_backends; i++) {
4264                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4265                 pwd = b->ops->nw_getpwent(b);
4266                 if (pwd) {
4267                         return pwd;
4268                 }
4269         }
4270
4271         return NULL;
4272 }
4273
4274 struct passwd *getpwent(void)
4275 {
4276         if (!nss_wrapper_enabled()) {
4277                 return libc_getpwent();
4278         }
4279
4280         return nwrap_getpwent();
4281 }
4282
4283 /****************************************************************************
4284  *   GETPWENT_R
4285  ***************************************************************************/
4286
4287 static int nwrap_getpwent_r(struct passwd *pwdst, char *buf,
4288                             size_t buflen, struct passwd **pwdstp)
4289 {
4290         int i,ret;
4291
4292         for (i=0; i < nwrap_main_global->num_backends; i++) {
4293                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4294                 ret = b->ops->nw_getpwent_r(b, pwdst, buf, buflen, pwdstp);
4295                 if (ret == ENOENT) {
4296                         continue;
4297                 }
4298                 return ret;
4299         }
4300
4301         return ENOENT;
4302 }
4303
4304 #ifdef HAVE_SOLARIS_GETPWENT_R
4305 struct passwd *getpwent_r(struct passwd *pwdst, char *buf, int buflen)
4306 {
4307         struct passwd *pwdstp = NULL;
4308         int rc;
4309
4310         if (!nss_wrapper_enabled()) {
4311                 return libc_getpwent_r(pwdst, buf, buflen);
4312         }
4313         rc = nwrap_getpwent_r(pwdst, buf, buflen, &pwdstp);
4314         if (rc < 0) {
4315                 return NULL;
4316         }
4317
4318         return pwdstp;
4319 }
4320 #else /* HAVE_SOLARIS_GETPWENT_R */
4321 int getpwent_r(struct passwd *pwdst, char *buf,
4322                size_t buflen, struct passwd **pwdstp)
4323 {
4324         if (!nss_wrapper_enabled()) {
4325                 return libc_getpwent_r(pwdst, buf, buflen, pwdstp);
4326         }
4327
4328         return nwrap_getpwent_r(pwdst, buf, buflen, pwdstp);
4329 }
4330 #endif /* HAVE_SOLARIS_GETPWENT_R */
4331
4332 /****************************************************************************
4333  *   ENDPWENT
4334  ***************************************************************************/
4335
4336 static void nwrap_endpwent(void)
4337 {
4338         int i;
4339
4340         for (i=0; i < nwrap_main_global->num_backends; i++) {
4341                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4342                 b->ops->nw_endpwent(b);
4343         }
4344 }
4345
4346 void endpwent(void)
4347 {
4348         if (!nss_wrapper_enabled()) {
4349                 libc_endpwent();
4350                 return;
4351         }
4352
4353         nwrap_endpwent();
4354 }
4355
4356 /****************************************************************************
4357  *   INITGROUPS
4358  ***************************************************************************/
4359
4360 static int nwrap_initgroups(const char *user, gid_t group)
4361 {
4362         int i;
4363
4364         for (i=0; i < nwrap_main_global->num_backends; i++) {
4365                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4366                 int rc;
4367
4368                 rc = b->ops->nw_initgroups(b, user, group);
4369                 if (rc == 0) {
4370                         return 0;
4371                 }
4372         }
4373
4374         errno = ENOENT;
4375         return -1;
4376 }
4377
4378 int initgroups(const char *user, gid_t group)
4379 {
4380         if (!nss_wrapper_enabled()) {
4381                 return libc_initgroups(user, group);
4382         }
4383
4384         return nwrap_initgroups(user, group);
4385 }
4386
4387 /****************************************************************************
4388  *   GETGRNAM
4389  ***************************************************************************/
4390
4391 static struct group *nwrap_getgrnam(const char *name)
4392 {
4393         int i;
4394         struct group *grp;
4395
4396         for (i=0; i < nwrap_main_global->num_backends; i++) {
4397                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4398                 grp = b->ops->nw_getgrnam(b, name);
4399                 if (grp) {
4400                         return grp;
4401                 }
4402         }
4403
4404         return NULL;
4405 }
4406
4407 struct group *getgrnam(const char *name)
4408 {
4409         if (!nss_wrapper_enabled()) {
4410                 return libc_getgrnam(name);
4411         }
4412
4413         return nwrap_getgrnam(name);
4414 }
4415
4416 /****************************************************************************
4417  *   GETGRNAM_R
4418  ***************************************************************************/
4419
4420 static int nwrap_getgrnam_r(const char *name, struct group *grdst,
4421                             char *buf, size_t buflen, struct group **grdstp)
4422 {
4423         int i, ret;
4424
4425         for (i=0; i < nwrap_main_global->num_backends; i++) {
4426                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4427                 ret = b->ops->nw_getgrnam_r(b, name, grdst, buf, buflen, grdstp);
4428                 if (ret == ENOENT) {
4429                         continue;
4430                 }
4431                 return ret;
4432         }
4433
4434         return ENOENT;
4435 }
4436
4437 #ifdef HAVE_GETGRNAM_R
4438 # ifdef HAVE_SOLARIS_GETGRNAM_R
4439 int getgrnam_r(const char *name, struct group *grp,
4440                 char *buf, int buflen, struct group **pgrp)
4441 # else /* HAVE_SOLARIS_GETGRNAM_R */
4442 int getgrnam_r(const char *name, struct group *grp,
4443                char *buf, size_t buflen, struct group **pgrp)
4444 # endif /* HAVE_SOLARIS_GETGRNAM_R */
4445 {
4446         if (!nss_wrapper_enabled()) {
4447                 return libc_getgrnam_r(name,
4448                                        grp,
4449                                        buf,
4450                                        buflen,
4451                                        pgrp);
4452         }
4453
4454         return nwrap_getgrnam_r(name, grp, buf, buflen, pgrp);
4455 }
4456 #endif /* HAVE_GETGRNAM_R */
4457
4458 /****************************************************************************
4459  *   GETGRGID
4460  ***************************************************************************/
4461
4462 static struct group *nwrap_getgrgid(gid_t gid)
4463 {
4464         int i;
4465         struct group *grp;
4466
4467         for (i=0; i < nwrap_main_global->num_backends; i++) {
4468                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4469                 grp = b->ops->nw_getgrgid(b, gid);
4470                 if (grp) {
4471                         return grp;
4472                 }
4473         }
4474
4475         return NULL;
4476 }
4477
4478 struct group *getgrgid(gid_t gid)
4479 {
4480         if (!nss_wrapper_enabled()) {
4481                 return libc_getgrgid(gid);
4482         }
4483
4484         return nwrap_getgrgid(gid);
4485 }
4486
4487 /****************************************************************************
4488  *   GETGRGID_R
4489  ***************************************************************************/
4490
4491 static int nwrap_getgrgid_r(gid_t gid, struct group *grdst,
4492                             char *buf, size_t buflen, struct group **grdstp)
4493 {
4494         int i,ret;
4495
4496         for (i=0; i < nwrap_main_global->num_backends; i++) {
4497                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4498                 ret = b->ops->nw_getgrgid_r(b, gid, grdst, buf, buflen, grdstp);
4499                 if (ret == ENOENT) {
4500                         continue;
4501                 }
4502                 return ret;
4503         }
4504
4505         return ENOENT;
4506 }
4507
4508 #ifdef HAVE_GETGRGID_R
4509 # ifdef HAVE_SOLARIS_GETGRGID_R
4510 int getgrgid_r(gid_t gid, struct group *grdst,
4511                char *buf, int buflen, struct group **grdstp)
4512 # else /* HAVE_SOLARIS_GETGRGID_R */
4513 int getgrgid_r(gid_t gid, struct group *grdst,
4514                char *buf, size_t buflen, struct group **grdstp)
4515 # endif /* HAVE_SOLARIS_GETGRGID_R */
4516 {
4517         if (!nss_wrapper_enabled()) {
4518                 return libc_getgrgid_r(gid, grdst, buf, buflen, grdstp);
4519         }
4520
4521         return nwrap_getgrgid_r(gid, grdst, buf, buflen, grdstp);
4522 }
4523 #endif
4524
4525 /****************************************************************************
4526  *   SETGRENT
4527  ***************************************************************************/
4528
4529 static void nwrap_setgrent(void)
4530 {
4531         int i;
4532
4533         for (i=0; i < nwrap_main_global->num_backends; i++) {
4534                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4535                 b->ops->nw_setgrent(b);
4536         }
4537 }
4538
4539 #ifdef HAVE_BSD_SETGRENT
4540 int setgrent(void)
4541 #else
4542 void setgrent(void)
4543 #endif
4544 {
4545         if (!nss_wrapper_enabled()) {
4546                 libc_setgrent();
4547                 goto out;
4548         }
4549
4550         nwrap_setgrent();
4551
4552 out:
4553 #ifdef HAVE_BSD_SETGRENT
4554         return 0;
4555 #else
4556         return;
4557 #endif
4558 }
4559
4560 /****************************************************************************
4561  *   GETGRENT
4562  ***************************************************************************/
4563
4564 static struct group *nwrap_getgrent(void)
4565 {
4566         int i;
4567         struct group *grp;
4568
4569         for (i=0; i < nwrap_main_global->num_backends; i++) {
4570                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4571                 grp = b->ops->nw_getgrent(b);
4572                 if (grp) {
4573                         return grp;
4574                 }
4575         }
4576
4577         return NULL;
4578 }
4579
4580 struct group *getgrent(void)
4581 {
4582         if (!nss_wrapper_enabled()) {
4583                 return libc_getgrent();
4584         }
4585
4586         return nwrap_getgrent();
4587 }
4588
4589 /****************************************************************************
4590  *   GETGRENT_R
4591  ***************************************************************************/
4592
4593 static int nwrap_getgrent_r(struct group *grdst, char *buf,
4594                             size_t buflen, struct group **grdstp)
4595 {
4596         int i,ret;
4597
4598         for (i=0; i < nwrap_main_global->num_backends; i++) {
4599                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4600                 ret = b->ops->nw_getgrent_r(b, grdst, buf, buflen, grdstp);
4601                 if (ret == ENOENT) {
4602                         continue;
4603                 }
4604                 return ret;
4605         }
4606
4607         return ENOENT;
4608 }
4609
4610 #ifdef HAVE_SOLARIS_GETGRENT_R
4611 struct group *getgrent_r(struct group *src, char *buf, int buflen)
4612 {
4613         struct group *grdstp = NULL;
4614         int rc;
4615
4616         if (!nss_wrapper_enabled()) {
4617                 return libc_getgrent_r(src, buf, buflen);
4618         }
4619
4620         rc = nwrap_getgrent_r(src, buf, buflen, &grdstp);
4621         if (rc < 0) {
4622                 return NULL;
4623         }
4624
4625         return grdstp;
4626 }
4627 #else /* HAVE_SOLARIS_GETGRENT_R */
4628 int getgrent_r(struct group *src, char *buf,
4629                size_t buflen, struct group **grdstp)
4630 {
4631         if (!nss_wrapper_enabled()) {
4632                 return libc_getgrent_r(src, buf, buflen, grdstp);
4633         }
4634
4635         return nwrap_getgrent_r(src, buf, buflen, grdstp);
4636 }
4637 #endif /* HAVE_SOLARIS_GETGRENT_R */
4638
4639 /****************************************************************************
4640  *   ENDGRENT
4641  ***************************************************************************/
4642
4643 static void nwrap_endgrent(void)
4644 {
4645         int i;
4646
4647         for (i=0; i < nwrap_main_global->num_backends; i++) {
4648                 struct nwrap_backend *b = &nwrap_main_global->backends[i];
4649                 b->ops->nw_endgrent(b);
4650         }
4651 }
4652
4653 void endgrent(void)
4654 {
4655         if (!nss_wrapper_enabled()) {
4656                 libc_endgrent();
4657                 return;
4658         }
4659
4660         nwrap_endgrent();
4661 }
4662
4663 /****************************************************************************
4664  *   GETGROUPLIST
4665  ***************************************************************************/
4666
4667 #ifdef HAVE_GETGROUPLIST
4668 static int nwrap_getgrouplist(const char *user, gid_t group,
4669                               gid_t *groups, int *ngroups)
4670 {
4671         struct group *grp;
4672         gid_t *groups_tmp;
4673         int count = 1;
4674
4675         NWRAP_LOG(NWRAP_LOG_DEBUG, "getgrouplist called for %s", user);
4676
4677         groups_tmp = (gid_t *)malloc(count * sizeof(gid_t));
4678         if (!groups_tmp) {
4679                 NWRAP_LOG(NWRAP_LOG_ERROR, "Out of memory");
4680                 errno = ENOMEM;
4681                 return -1;
4682         }
4683         groups_tmp[0] = group;
4684
4685         nwrap_setgrent();
4686         while ((grp = nwrap_getgrent()) != NULL) {
4687                 int i = 0;
4688
4689                 NWRAP_LOG(NWRAP_LOG_DEBUG,
4690                           "Inspecting %s for group membership",
4691                           grp->gr_name);
4692
4693                 for (i=0; grp->gr_mem && grp->gr_mem[i] != NULL; i++) {
4694
4695                         if (group != grp->gr_gid &&
4696                             (strcmp(user, grp->gr_mem[i]) == 0)) {
4697
4698                                 NWRAP_LOG(NWRAP_LOG_DEBUG,
4699                                           "%s is member of %s",
4700                                           user,
4701                                           grp->gr_name);
4702
4703                                 groups_tmp = (gid_t *)realloc(groups_tmp, (count + 1) * sizeof(gid_t));
4704                                 if (!groups_tmp) {
4705                                         NWRAP_LOG(NWRAP_LOG_ERROR,
4706                                                   "Out of memory");
4707                                         errno = ENOMEM;
4708                                         return -1;
4709                                 }
4710                                 groups_tmp[count] = grp->gr_gid;
4711
4712                                 count++;
4713                         }
4714                 }
4715         }
4716
4717         nwrap_endgrent();
4718
4719         NWRAP_LOG(NWRAP_LOG_DEBUG,
4720                   "%s is member of %d groups",
4721                   user, *ngroups);
4722
4723         if (*ngroups < count) {
4724                 *ngroups = count;
4725                 free(groups_tmp);
4726                 return -1;
4727         }
4728
4729         *ngroups = count;
4730         memcpy(groups, groups_tmp, count * sizeof(gid_t));
4731         free(groups_tmp);
4732
4733         return count;
4734 }
4735
4736 int getgrouplist(const char *user, gid_t group, gid_t *groups, int *ngroups)
4737 {
4738         if (!nss_wrapper_enabled()) {
4739                 return libc_getgrouplist(user, group, groups, ngroups);
4740         }
4741
4742         return nwrap_getgrouplist(user, group, groups, ngroups);
4743 }
4744 #endif
4745
4746 /**********************************************************
4747  * SHADOW
4748  **********************************************************/
4749
4750 #if defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM)
4751
4752 #ifdef HAVE_SETSPENT
4753 static void nwrap_setspent(void)
4754 {
4755         nwrap_files_setspent();
4756 }
4757
4758 void setspent(void)
4759 {
4760         if (!nss_wrapper_shadow_enabled()) {
4761                 return;
4762         }
4763
4764         nwrap_setspent();
4765 }
4766
4767 static struct spwd *nwrap_getspent(void)
4768 {
4769         return nwrap_files_getspent();
4770 }
4771
4772 struct spwd *getspent(void)
4773 {
4774         if (!nss_wrapper_shadow_enabled()) {
4775                 return NULL;
4776         }
4777
4778         return nwrap_getspent();
4779 }
4780
4781 static void nwrap_endspent(void)
4782 {
4783         nwrap_files_endspent();
4784 }
4785
4786 void endspent(void)
4787 {
4788         if (!nss_wrapper_shadow_enabled()) {
4789                 return;
4790         }
4791
4792         nwrap_endspent();
4793 }
4794 #endif /* HAVE_SETSPENT */
4795
4796 static struct spwd *nwrap_getspnam(const char *name)
4797 {
4798         return nwrap_files_getspnam(name);
4799 }
4800
4801 struct spwd *getspnam(const char *name)
4802 {
4803         if (!nss_wrapper_shadow_enabled()) {
4804                 return NULL;
4805         }
4806
4807         return nwrap_getspnam(name);
4808 }
4809
4810 #endif /* defined(HAVE_SHADOW_H) && defined(HAVE_GETSPNAM) */
4811
4812 /**********************************************************
4813  * NETDB
4814  **********************************************************/
4815
4816 static void nwrap_sethostent(int stayopen) {
4817         (void) stayopen; /* ignored */
4818
4819         nwrap_files_sethostent();
4820 }
4821
4822 #ifdef HAVE_SOLARIS_SETHOSTENT
4823 int sethostent(int stayopen)
4824 {
4825         if (!nss_wrapper_hosts_enabled()) {
4826                 libc_sethostent(stayopen);
4827                 return 0;
4828         }
4829
4830         nwrap_sethostent(stayopen);
4831
4832         return 0;
4833 }
4834 #else /* HAVE_SOLARIS_SETHOSTENT */
4835 void sethostent(int stayopen)
4836 {
4837         if (!nss_wrapper_hosts_enabled()) {
4838                 libc_sethostent(stayopen);
4839                 return;
4840         }
4841
4842         nwrap_sethostent(stayopen);
4843 }
4844 #endif /* HAVE_SOLARIS_SETHOSTENT */
4845
4846 static struct hostent *nwrap_gethostent(void)
4847 {
4848         return nwrap_files_gethostent();
4849 }
4850
4851 struct hostent *gethostent(void) {
4852         if (!nss_wrapper_hosts_enabled()) {
4853                 return libc_gethostent();
4854         }
4855
4856         return nwrap_gethostent();
4857 }
4858
4859 static void nwrap_endhostent(void) {
4860         nwrap_files_endhostent();
4861 }
4862
4863 #ifdef HAVE_SOLARIS_ENDHOSTENT
4864 int endhostent(void)
4865 {
4866         if (!nss_wrapper_hosts_enabled()) {
4867                 libc_endhostent();
4868                 return 0;
4869         }
4870
4871         nwrap_endhostent();
4872
4873         return 0;
4874 }
4875 #else /* HAVE_SOLARIS_ENDHOSTENT */
4876 void endhostent(void)
4877 {
4878         if (!nss_wrapper_hosts_enabled()) {
4879                 libc_endhostent();
4880                 return;
4881         }
4882
4883         nwrap_endhostent();
4884 }
4885 #endif /* HAVE_SOLARIS_ENDHOSTENT */
4886
4887 #ifdef BSD
4888 /* BSD implementation stores data in thread local storage but GLIBC does not */
4889 static __thread struct hostent user_he;
4890 static __thread struct nwrap_vector user_addrlist;
4891 #else
4892 static struct hostent user_he;
4893 static struct nwrap_vector user_addrlist;
4894 #endif /* BSD */
4895 static struct hostent *nwrap_gethostbyname(const char *name)
4896 {
4897         if (nwrap_files_gethostbyname(name, AF_UNSPEC, &user_he, &user_addrlist) == -1) {
4898                 return NULL;
4899         }
4900         return &user_he;
4901 }
4902
4903 struct hostent *gethostbyname(const char *name)
4904 {
4905         if (!nss_wrapper_hosts_enabled()) {
4906                 return libc_gethostbyname(name);
4907         }
4908
4909         return nwrap_gethostbyname(name);
4910 }
4911
4912 /* This is a GNU extension - Also can be found on BSD systems */
4913 #ifdef HAVE_GETHOSTBYNAME2
4914 #ifdef BSD
4915 /* BSD implementation stores data in  thread local storage but GLIBC not */
4916 static __thread struct hostent user_he2;
4917 static __thread struct nwrap_vector user_addrlist2;
4918 #else
4919 static struct hostent user_he2;
4920 static struct nwrap_vector user_addrlist2;
4921 #endif /* BSD */
4922 static struct hostent *nwrap_gethostbyname2(const char *name, int af)
4923 {
4924         if (nwrap_files_gethostbyname(name, af, &user_he2, &user_addrlist2) == -1) {
4925                 return NULL;
4926         }
4927         return &user_he2;
4928 }
4929
4930 struct hostent *gethostbyname2(const char *name, int af)
4931 {
4932         if (!nss_wrapper_hosts_enabled()) {
4933                 return libc_gethostbyname2(name, af);
4934         }
4935
4936         return nwrap_gethostbyname2(name, af);
4937 }
4938 #endif
4939
4940 static struct hostent *nwrap_gethostbyaddr(const void *addr,
4941                                            socklen_t len, int type)
4942 {
4943         return nwrap_files_gethostbyaddr(addr, len, type);
4944 }
4945
4946 struct hostent *gethostbyaddr(const void *addr,
4947                               socklen_t len, int type)
4948 {
4949         if (!nss_wrapper_hosts_enabled()) {
4950                 return libc_gethostbyaddr(addr, len, type);
4951         }
4952
4953         return nwrap_gethostbyaddr(addr, len, type);
4954 }
4955
4956 static const struct addrinfo default_hints =
4957 {
4958         .ai_flags = AI_ADDRCONFIG|AI_V4MAPPED,
4959         .ai_family = AF_UNSPEC,
4960         .ai_socktype = 0,
4961         .ai_protocol = 0,
4962         .ai_addrlen = 0,
4963         .ai_addr = NULL,
4964         .ai_canonname = NULL,
4965         .ai_next = NULL
4966 };
4967
4968 static int nwrap_convert_he_ai(const struct hostent *he,
4969                                unsigned short port,
4970                                const struct addrinfo *hints,
4971                                struct addrinfo **pai,
4972                                bool skip_canonname)
4973 {
4974         struct addrinfo *ai;
4975         socklen_t socklen;
4976
4977         if (he == NULL) {
4978                 return EAI_MEMORY;
4979         }
4980
4981         switch (he->h_addrtype) {
4982                 case AF_INET:
4983                         socklen = sizeof(struct sockaddr_in);
4984                         break;
4985 #ifdef HAVE_IPV6
4986                 case AF_INET6:
4987                         socklen = sizeof(struct sockaddr_in6);
4988                         break;
4989 #endif
4990                 default:
4991                         return EAI_FAMILY;
4992         }
4993
4994         ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) + socklen);
4995         if (ai == NULL) {
4996                 return EAI_MEMORY;
4997         }
4998
4999         ai->ai_flags = 0;
5000         ai->ai_family = he->h_addrtype;
5001         ai->ai_socktype = hints->ai_socktype;
5002         ai->ai_protocol = hints->ai_protocol;
5003         ai->ai_canonname = NULL;
5004
5005         ai->ai_addrlen = socklen;
5006         ai->ai_addr = (void *)(ai + 1);
5007
5008 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
5009         ai->ai_addr->sa_len = socklen;
5010 #endif
5011         ai->ai_addr->sa_family = he->h_addrtype;
5012
5013         switch (he->h_addrtype) {
5014                 case AF_INET:
5015                 {
5016                         struct sockaddr_in *sinp =
5017                                 (struct sockaddr_in *) ai->ai_addr;
5018
5019                         memset(sinp, 0, sizeof(struct sockaddr_in));
5020
5021                         sinp->sin_port = htons(port);
5022                         sinp->sin_family = AF_INET;
5023
5024                         memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero));
5025                         memcpy(&sinp->sin_addr, he->h_addr_list[0], he->h_length);
5026
5027                 }
5028                 break;
5029 #ifdef HAVE_IPV6
5030                 case AF_INET6:
5031                 {
5032                         struct sockaddr_in6 *sin6p =
5033                                 (struct sockaddr_in6 *) ai->ai_addr;
5034
5035                         memset(sin6p, 0, sizeof(struct sockaddr_in6));
5036
5037                         sin6p->sin6_port = htons(port);
5038                         sin6p->sin6_family = AF_INET6;
5039
5040                         memcpy(&sin6p->sin6_addr,
5041                                he->h_addr_list[0],
5042                                he->h_length);
5043                 }
5044                 break;
5045 #endif
5046         }
5047
5048         ai->ai_next = NULL;
5049
5050         if (he->h_name && !skip_canonname) {
5051                 ai->ai_canonname = strdup(he->h_name);
5052                 if (ai->ai_canonname == NULL) {
5053                         freeaddrinfo(ai);
5054                         return EAI_MEMORY;
5055                 }
5056         }
5057
5058         *pai = ai;
5059         return 0;
5060 }
5061
5062 static int nwrap_getaddrinfo(const char *node,
5063                              const char *service,
5064                              const struct addrinfo *hints,
5065                              struct addrinfo **res)
5066 {
5067         struct addrinfo *ai = NULL;
5068         struct addrinfo *ai_tail;
5069         unsigned short port = 0;
5070         struct {
5071                 int family;
5072                 union {
5073                         struct in_addr v4;
5074 #ifdef HAVE_IPV6
5075                         struct in6_addr v6;
5076                 } in;
5077 #endif
5078         } addr = {
5079                 .family = AF_UNSPEC,
5080         };
5081
5082         if (node == NULL && service == NULL) {
5083                 return EAI_NONAME;
5084         }
5085
5086         if (hints == NULL) {
5087                 hints = &default_hints;
5088         }
5089
5090         /* EAI_BADFLAGS
5091               hints.ai_flags   contains   invalid  flags;  or,  hints.ai_flags
5092               included AI_CANONNAME and name was NULL.
5093         */
5094         if ((hints->ai_flags & AI_CANONNAME) && (node == NULL)) {
5095                 return EAI_BADFLAGS;
5096         }
5097
5098         /* If no node has been specified, let glibc deal with it */
5099         if (node == NULL) {
5100                 int ret;
5101                 struct addrinfo *p = NULL;
5102
5103                 ret = libc_getaddrinfo(node, service, hints, &p);
5104
5105                 if (ret == 0) {
5106                         *res = p;
5107                 }
5108                 return ret;
5109         }
5110
5111         if (service != NULL && service[0] != '\0') {
5112                 const char *proto = NULL;
5113                 struct servent *s;
5114                 char *end_ptr;
5115                 long sl;
5116
5117                 errno = 0;
5118                 sl = strtol(service, &end_ptr, 10);
5119
5120                 if (*end_ptr == '\0') {
5121                         port = sl;
5122                         goto valid_port;
5123                 } else if (hints->ai_flags & AI_NUMERICSERV) {
5124                         return EAI_NONAME;
5125                 }
5126
5127                 if (hints->ai_protocol != 0) {
5128                         struct protoent *pent;
5129
5130                         pent = getprotobynumber(hints->ai_protocol);
5131                         if (pent != NULL) {
5132                                 proto = pent->p_name;
5133                         }
5134                 }
5135
5136                 s = getservbyname(service, proto);
5137                 if (s == NULL) {
5138                         return EAI_NONAME;
5139                 }
5140                 port = ntohs(s->s_port);
5141         }
5142
5143 valid_port:
5144         if (hints->ai_family == AF_UNSPEC || hints->ai_family == AF_INET) {
5145                 int rc = inet_pton(AF_INET, node, &addr.in.v4);
5146                 if (rc == 1) {
5147                         addr.family = AF_INET;
5148                 }
5149         }
5150 #ifdef HAVE_IPV6
5151         if (addr.family == AF_UNSPEC) {
5152                 int rc = inet_pton(AF_INET6, node, &addr.in.v6);
5153                 if (rc == 1) {
5154                         addr.family = AF_INET6;
5155                 }
5156         }
5157 #endif
5158
5159         ai = nwrap_files_getaddrinfo(node, port, hints, &ai_tail);
5160         if (ai == NULL) {
5161                 int ret;
5162                 struct addrinfo *p = NULL;
5163
5164                 ret = libc_getaddrinfo(node, service, hints, &p);
5165
5166                 if (ret == 0) {
5167                         /*
5168                          * nwrap_files_getaddrinfo failed, but libc was
5169                          * successful -- use the result from libc.
5170                          */
5171                         *res = p;
5172                         return 0;
5173                 }
5174
5175                 return EAI_SYSTEM;
5176         }
5177
5178         if (ai->ai_flags == 0) {
5179                 ai->ai_flags = hints->ai_flags;
5180         }
5181         if (ai->ai_socktype == 0) {
5182                 ai->ai_socktype = SOCK_DGRAM;
5183         }
5184         if (ai->ai_protocol == 0 && ai->ai_socktype == SOCK_DGRAM) {
5185                 ai->ai_protocol = 17; /* UDP */
5186         } else if (ai->ai_protocol == 0 && ai->ai_socktype == SOCK_STREAM) {
5187                 ai->ai_protocol = 6; /* TCP */
5188         }
5189
5190         if (hints->ai_socktype == 0) {
5191                 /* Add second ai */
5192                 struct addrinfo *ai_head = ai;
5193                 struct addrinfo *ai_tmp;
5194                 struct addrinfo *ai_new_tail = ai_tail;
5195
5196                 /* Add at least one more struct */
5197                 do {
5198                         /* CHECKS! */
5199                         ai_tmp = malloc(sizeof(struct addrinfo));
5200                         memcpy(ai_tmp, ai_head, sizeof(struct addrinfo));
5201                         ai_tmp->ai_next = NULL;
5202
5203                         /* We need a deep copy or freeaddrinfo() will blow up */
5204                         if (ai_head->ai_canonname != NULL) {
5205                                 ai_tmp->ai_canonname =
5206                                         strdup(ai_head->ai_canonname);
5207                         }
5208                         /* ai_head should point inside hints. */
5209                         ai_tmp->ai_addr = ai_head->ai_addr;
5210
5211                         if (ai_head->ai_flags == 0) {
5212                                 ai_tmp->ai_flags = hints->ai_flags;
5213                         }
5214                         if (ai_head->ai_socktype == SOCK_DGRAM) {
5215                                 ai_tmp->ai_socktype = SOCK_STREAM;
5216                         } else if (ai_head->ai_socktype == SOCK_STREAM) {
5217                                 ai_tmp->ai_socktype = SOCK_DGRAM;
5218                         }
5219                         if (ai_head->ai_socktype == SOCK_DGRAM) {
5220                                 ai_tmp->ai_protocol = 17; /* UDP */
5221                         } else if (ai_head->ai_socktype == SOCK_STREAM) {
5222                                 ai_tmp->ai_protocol = 6; /* TCP */
5223                         }
5224                         ai_new_tail->ai_next = ai_tmp;
5225                         ai_new_tail = ai_tmp;
5226
5227                         if (ai_head == ai_tail) {
5228                                 break;
5229                         }
5230                         ai_head = ai_head->ai_next;
5231                 } while (1);
5232         }
5233
5234         *res = ai;
5235
5236         return 0;
5237 }
5238
5239 int getaddrinfo(const char *node, const char *service,
5240                 const struct addrinfo *hints,
5241                 struct addrinfo **res)
5242 {
5243         if (!nss_wrapper_hosts_enabled()) {
5244                 return libc_getaddrinfo(node, service, hints, res);
5245         }
5246
5247         return nwrap_getaddrinfo(node, service, hints, res);
5248 }
5249
5250 static int nwrap_getnameinfo(const struct sockaddr *sa, socklen_t salen,
5251                              char *host, size_t hostlen,
5252                              char *serv, size_t servlen,
5253                              int flags)
5254 {
5255         struct hostent *he;
5256         struct servent *service;
5257         const char *proto;
5258         const void *addr;
5259         socklen_t addrlen;
5260         uint16_t port;
5261         sa_family_t type;
5262
5263         if (sa == NULL || salen < sizeof(sa_family_t)) {
5264                 return EAI_FAMILY;
5265         }
5266
5267         if ((flags & NI_NAMEREQD) && host == NULL && serv == NULL) {
5268                 return EAI_NONAME;
5269         }
5270
5271         type = sa->sa_family;
5272         switch (type) {
5273         case AF_INET:
5274                 if (salen < sizeof(struct sockaddr_in))
5275                         return EAI_FAMILY;
5276                 addr = &((const struct sockaddr_in *)sa)->sin_addr;
5277                 addrlen = sizeof(((const struct sockaddr_in *)sa)->sin_addr);
5278                 port = ntohs(((const struct sockaddr_in *)sa)->sin_port);
5279                 break;
5280 #ifdef HAVE_IPV6
5281         case AF_INET6:
5282                 if (salen < sizeof(struct sockaddr_in6))
5283                         return EAI_FAMILY;
5284                 addr = &((const struct sockaddr_in6 *)sa)->sin6_addr;
5285                 addrlen = sizeof(((const struct sockaddr_in6 *)sa)->sin6_addr);
5286                 port = ntohs(((const struct sockaddr_in6 *)sa)->sin6_port);
5287                 break;
5288 #endif
5289         default:
5290                 return EAI_FAMILY;
5291         }
5292
5293         if (host != NULL) {
5294                 he = NULL;
5295                 if ((flags & NI_NUMERICHOST) == 0) {
5296                         he = nwrap_files_gethostbyaddr(addr, addrlen, type);
5297                         if ((flags & NI_NAMEREQD) && (he == NULL || he->h_name == NULL))
5298                                 return EAI_NONAME;
5299                 }
5300                 if (he != NULL && he->h_name != NULL) {
5301                         if (strlen(he->h_name) >= hostlen)
5302                                 return EAI_OVERFLOW;
5303                         strcpy(host, he->h_name);
5304                         if (flags & NI_NOFQDN)
5305                                 host[strcspn(host, ".")] = '\0';
5306                 } else {
5307                         if (inet_ntop(type, addr, host, hostlen) == NULL)
5308                                 return (errno == ENOSPC) ? EAI_OVERFLOW : EAI_FAIL;
5309                 }
5310         }
5311
5312         if (serv != NULL) {
5313                 service = NULL;
5314                 if ((flags & NI_NUMERICSERV) == 0) {
5315                         proto = (flags & NI_DGRAM) ? "udp" : "tcp";
5316                         service = getservbyport(htons(port), proto);
5317                 }
5318                 if (service != NULL) {
5319                         if (strlen(service->s_name) >= servlen)
5320                                 return EAI_OVERFLOW;
5321                         strcpy(serv, service->s_name);
5322                 } else {
5323                         if (snprintf(serv, servlen, "%u", port) >= (int) servlen)
5324                                 return EAI_OVERFLOW;
5325                 }
5326         }
5327
5328         return 0;
5329 }
5330
5331 #ifdef HAVE_LINUX_GETNAMEINFO
5332 int getnameinfo(const struct sockaddr *sa, socklen_t salen,
5333                 char *host, socklen_t hostlen,
5334                 char *serv, socklen_t servlen,
5335                 int flags)
5336 #elif defined(HAVE_LINUX_GETNAMEINFO_UNSIGNED)
5337 int getnameinfo(const struct sockaddr *sa, socklen_t salen,
5338                 char *host, socklen_t hostlen,
5339                 char *serv, socklen_t servlen,
5340                 unsigned int flags)
5341 #else
5342 int getnameinfo(const struct sockaddr *sa, socklen_t salen,
5343                 char *host, size_t hostlen,
5344                 char *serv, size_t servlen,
5345                 int flags)
5346 #endif
5347 {
5348         if (!nss_wrapper_hosts_enabled()) {
5349                 return libc_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
5350         }
5351
5352         return nwrap_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
5353 }
5354
5355 static int nwrap_gethostname(char *name, size_t len)
5356 {
5357         const char *hostname = getenv("NSS_WRAPPER_HOSTNAME");
5358
5359         if (strlen(hostname) >= len) {
5360                 errno = ENAMETOOLONG;
5361                 return -1;
5362         }
5363         snprintf(name, len, "%s", hostname);
5364
5365         return 0;
5366 }
5367
5368 #ifdef HAVE_SOLARIS_GETHOSTNAME
5369 int gethostname(char *name, int len)
5370 #else /* HAVE_SOLARIS_GETHOSTNAME */
5371 int gethostname(char *name, size_t len)
5372 #endif /* HAVE_SOLARIS_GETHOSTNAME */
5373 {
5374         if (!nwrap_hostname_enabled()) {
5375                 return libc_gethostname(name, len);
5376         }
5377
5378         return nwrap_gethostname(name, len);
5379 }
5380
5381 /****************************
5382  * DESTRUCTOR
5383  ***************************/
5384
5385 /*
5386  * This function is called when the library is unloaded and makes sure that
5387  * sockets get closed and the unix file for the socket are unlinked.
5388  */
5389 void nwrap_destructor(void)
5390 {
5391         int i;
5392
5393         NWRAP_LOCK_ALL;
5394         if (nwrap_main_global != NULL) {
5395                 struct nwrap_main *m = nwrap_main_global;
5396
5397                 /* libc */
5398                 SAFE_FREE(m->libc->fns);
5399                 if (m->libc->handle != NULL) {
5400                         dlclose(m->libc->handle);
5401                 }
5402                 if (m->libc->nsl_handle != NULL) {
5403                         dlclose(m->libc->nsl_handle);
5404                 }
5405                 if (m->libc->sock_handle != NULL) {
5406                         dlclose(m->libc->sock_handle);
5407                 }
5408                 SAFE_FREE(m->libc);
5409
5410                 /* backends */
5411                 for (i = 0; i < m->num_backends; i++) {
5412                         struct nwrap_backend *b = &(m->backends[i]);
5413
5414                         if (b->so_handle != NULL) {
5415                                 dlclose(b->so_handle);
5416                         }
5417                         SAFE_FREE(b->fns);
5418                 }
5419                 SAFE_FREE(m->backends);
5420         }
5421
5422         if (nwrap_pw_global.cache != NULL) {
5423                 struct nwrap_cache *c = nwrap_pw_global.cache;
5424
5425                 nwrap_files_cache_unload(c);
5426                 if (c->fd >= 0) {
5427                         fclose(c->fp);
5428                         c->fd = -1;
5429                 }
5430
5431                 SAFE_FREE(nwrap_pw_global.list);
5432                 nwrap_pw_global.num = 0;
5433         }
5434
5435         if (nwrap_gr_global.cache != NULL) {
5436                 struct nwrap_cache *c = nwrap_gr_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_gr_global.list);
5445                 nwrap_pw_global.num = 0;
5446         }
5447
5448         if (nwrap_he_global.cache != NULL) {
5449                 struct nwrap_cache *c = nwrap_he_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                 nwrap_he_global.num = 0;
5458         }
5459
5460         hdestroy();
5461         NWRAP_UNLOCK_ALL;
5462 }