lib/socket_wrapper/socket_wrapper.c

   1 /*
   2  * Copyright (C) Jelmer Vernooij 2005,2008 <jelmer@samba.org>
   3  * Copyright (C) Stefan Metzmacher 2006 <metze@samba.org>
   4  *
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of the author nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  */
  35
  36 /*
  37    Socket wrapper library. Passes all socket communication over
  38    unix domain sockets if the environment variable SOCKET_WRAPPER_DIR
  39    is set.
  40 */
  41
  42 #ifdef _SAMBA_BUILD_
  43
  44 #define SOCKET_WRAPPER_NOT_REPLACE
  45 #include "../replace/replace.h"
  46 #include "system/network.h"
  47 #include "system/filesys.h"
  48 #include "system/time.h"
  49
  50 #else /* _SAMBA_BUILD_ */
  51
  52 #include <sys/types.h>
  53 #include <sys/time.h>
  54 #include <sys/stat.h>
  55 #include <sys/socket.h>
  56 #include <sys/ioctl.h>
  57 #include <sys/filio.h>
  58 #include <errno.h>
  59 #include <sys/un.h>
  60 #include <netinet/in.h>
  61 #include <netinet/tcp.h>
  62 #include <fcntl.h>
  63 #include <stdlib.h>
  64 #include <unistd.h>
  65 #include <string.h>
  66 #include <stdio.h>
  67 #include <stdint.h>
  68
  69 #endif
  70
  71 #ifndef _PUBLIC_
  72 #define _PUBLIC_
  73 #endif
  74
  75 #define SWRAP_DLIST_ADD(list,item) do { \
  76         if (!(list)) { \
  77                 (item)->prev    = NULL; \
  78                 (item)->next    = NULL; \
  79                 (list)          = (item); \
  80         } else { \
  81                 (item)->prev    = NULL; \
  82                 (item)->next    = (list); \
  83                 (list)->prev    = (item); \
  84                 (list)          = (item); \
  85         } \
  86 } while (0)
  87
  88 #define SWRAP_DLIST_REMOVE(list,item) do { \
  89         if ((list) == (item)) { \
  90                 (list)          = (item)->next; \
  91                 if (list) { \
  92                         (list)->prev    = NULL; \
  93                 } \
  94         } else { \
  95                 if ((item)->prev) { \
  96                         (item)->prev->next      = (item)->next; \
  97                 } \
  98                 if ((item)->next) { \
  99                         (item)->next->prev      = (item)->prev; \
 100                 } \
 101         } \
 102         (item)->prev    = NULL; \
 103         (item)->next    = NULL; \
 104 } while (0)
 105
 106 /* LD_PRELOAD doesn't work yet, so REWRITE_CALLS is all we support
 107  * for now */
 108 #define REWRITE_CALLS
 109
 110 #ifdef REWRITE_CALLS
 111 #define real_accept accept
 112 #define real_connect connect
 113 #define real_bind bind
 114 #define real_listen listen
 115 #define real_getpeername getpeername
 116 #define real_getsockname getsockname
 117 #define real_getsockopt getsockopt
 118 #define real_setsockopt setsockopt
 119 #define real_recvfrom recvfrom
 120 #define real_sendto sendto
 121 #define real_ioctl ioctl
 122 #define real_recv recv
 123 #define real_send send
 124 #define real_socket socket
 125 #define real_close close
 126 #endif
 127
 128 #ifdef HAVE_GETTIMEOFDAY_TZ
 129 #define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
 130 #else
 131 #define swrapGetTimeOfDay(tval) gettimeofday(tval)
 132 #endif
 133
 134 /* we need to use a very terse format here as IRIX 6.4 silently
 135    truncates names to 16 chars, so if we use a longer name then we
 136    can't tell which port a packet came from with recvfrom()
 137
 138    with this format we have 8 chars left for the directory name
 139 */
 140 #define SOCKET_FORMAT "%c%02X%04X"
 141 #define SOCKET_TYPE_CHAR_TCP            'T'
 142 #define SOCKET_TYPE_CHAR_UDP            'U'
 143 #define SOCKET_TYPE_CHAR_TCP_V6         'X'
 144 #define SOCKET_TYPE_CHAR_UDP_V6         'Y'
 145
 146 #define MAX_WRAPPED_INTERFACES 16
 147
 148 #define SW_IPV6_ADDRESS 1
 149
 150 static struct sockaddr *sockaddr_dup(const void *data, socklen_t len)
 151 {
 152         struct sockaddr *ret = (struct sockaddr *)malloc(len);
 153         memcpy(ret, data, len);
 154         return ret;
 155 }
 156
 157 static void set_port(int family, int prt, struct sockaddr *addr)
 158 {
 159         switch (family) {
 160         case AF_INET:
 161                 ((struct sockaddr_in *)addr)->sin_port = htons(prt);
 162                 break;
 163 #ifdef HAVE_IPV6
 164         case AF_INET6:
 165                 ((struct sockaddr_in6 *)addr)->sin6_port = htons(prt);
 166                 break;
 167 #endif
 168         }
 169 }
 170
 171 static size_t socket_length(int family)
 172 {
 173         switch (family) {
 174         case AF_INET:
 175                 return sizeof(struct sockaddr_in);
 176 #ifdef HAVE_IPV6
 177         case AF_INET6:
 178                 return sizeof(struct sockaddr_in6);
 179 #endif
 180         }
 181         return 0;
 182 }
 183
 184
 185
 186 struct socket_info
 187 {
 188         int fd;
 189
 190         int family;
 191         int type;
 192         int protocol;
 193         int bound;
 194         int bcast;
 195         int is_server;
 196
 197         char *path;
 198         char *tmp_path;
 199
 200         struct sockaddr *myname;
 201         socklen_t myname_len;
 202
 203         struct sockaddr *peername;
 204         socklen_t peername_len;
 205
 206         struct {
 207                 unsigned long pck_snd;
 208                 unsigned long pck_rcv;
 209         } io;
 210
 211         struct socket_info *prev, *next;
 212 };
 213
 214 static struct socket_info *sockets;
 215
 216 const char *socket_wrapper_dir(void)
 217 {
 218         const char *s = getenv("SOCKET_WRAPPER_DIR");
 219         if (s == NULL) {
 220                 return NULL;
 221         }
 222         if (strncmp(s, "./", 2) == 0) {
 223                 s += 2;
 224         }
 225         return s;
 226 }
 227
 228 unsigned int socket_wrapper_default_iface(void)
 229 {
 230         const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
 231         if (s) {
 232                 unsigned int iface;
 233                 if (sscanf(s, "%u", &iface) == 1) {
 234                         if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
 235                                 return iface;
 236                         }
 237                 }
 238         }
 239
 240         return 1;/* 127.0.0.1 */
 241 }
 242
 243 static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
 244 {
 245         unsigned int iface;
 246         unsigned int prt;
 247         const char *p;
 248         char type;
 249
 250         p = strrchr(un->sun_path, '/');
 251         if (p) p++; else p = un->sun_path;
 252
 253         if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
 254                 errno = EINVAL;
 255                 return -1;
 256         }
 257
 258         if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
 259                 errno = EINVAL;
 260                 return -1;
 261         }
 262
 263         if (prt > 0xFFFF) {
 264                 errno = EINVAL;
 265                 return -1;
 266         }
 267
 268         switch(type) {
 269         case SOCKET_TYPE_CHAR_TCP:
 270         case SOCKET_TYPE_CHAR_UDP: {
 271                 struct sockaddr_in *in2 = (struct sockaddr_in *)in;
 272
 273                 if ((*len) < sizeof(*in2)) {
 274                     errno = EINVAL;
 275                     return -1;
 276                 }
 277
 278                 memset(in2, 0, sizeof(*in2));
 279                 in2->sin_family = AF_INET;
 280                 in2->sin_addr.s_addr = htonl((127<<24) | iface);
 281                 in2->sin_port = htons(prt);
 282
 283                 *len = sizeof(*in2);
 284                 break;
 285         }
 286 #ifdef HAVE_IPV6
 287         case SOCKET_TYPE_CHAR_TCP_V6:
 288         case SOCKET_TYPE_CHAR_UDP_V6: {
 289                 struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)in;
 290
 291                 if ((*len) < sizeof(*in2)) {
 292                         errno = EINVAL;
 293                         return -1;
 294                 }
 295
 296                 memset(in2, 0, sizeof(*in2));
 297                 in2->sin6_family = AF_INET6;
 298                 in2->sin6_addr.s6_addr[0] = SW_IPV6_ADDRESS;
 299                 in2->sin6_port = htons(prt);
 300
 301                 *len = sizeof(*in2);
 302                 break;
 303         }
 304 #endif
 305         default:
 306                 errno = EINVAL;
 307                 return -1;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
 314                                 int *bcast)
 315 {
 316         char type = '\0';
 317         unsigned int prt;
 318         unsigned int iface;
 319         int is_bcast = 0;
 320
 321         if (bcast) *bcast = 0;
 322
 323         switch (si->family) {
 324         case AF_INET: {
 325                 const struct sockaddr_in *in =
 326                     (const struct sockaddr_in *)inaddr;
 327                 unsigned int addr = ntohl(in->sin_addr.s_addr);
 328                 char u_type = '\0';
 329                 char b_type = '\0';
 330                 char a_type = '\0';
 331
 332                 switch (si->type) {
 333                 case SOCK_STREAM:
 334                         u_type = SOCKET_TYPE_CHAR_TCP;
 335                         break;
 336                 case SOCK_DGRAM:
 337                         u_type = SOCKET_TYPE_CHAR_UDP;
 338                         a_type = SOCKET_TYPE_CHAR_UDP;
 339                         b_type = SOCKET_TYPE_CHAR_UDP;
 340                         break;
 341                 }
 342
 343                 prt = ntohs(in->sin_port);
 344                 if (a_type && addr == 0xFFFFFFFF) {
 345                         /* 255.255.255.255 only udp */
 346                         is_bcast = 2;
 347                         type = a_type;
 348                         iface = socket_wrapper_default_iface();
 349                 } else if (b_type && addr == 0x7FFFFFFF) {
 350                         /* 127.255.255.255 only udp */
 351                         is_bcast = 1;
 352                         type = b_type;
 353                         iface = socket_wrapper_default_iface();
 354                 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
 355                         /* 127.0.0.X */
 356                         is_bcast = 0;
 357                         type = u_type;
 358                         iface = (addr & 0x000000FF);
 359                 } else {
 360                         errno = ENETUNREACH;
 361                         return -1;
 362                 }
 363                 if (bcast) *bcast = is_bcast;
 364                 break;
 365         }
 366 #ifdef HAVE_IPV6
 367         case AF_INET6: {
 368                 const struct sockaddr_in6 *in =
 369                     (const struct sockaddr_in6 *)inaddr;
 370
 371                 switch (si->type) {
 372                 case SOCK_STREAM:
 373                         type = SOCKET_TYPE_CHAR_TCP_V6;
 374                         break;
 375                 case SOCK_DGRAM:
 376                         type = SOCKET_TYPE_CHAR_UDP_V6;
 377                         break;
 378                 }
 379
 380                 /* XXX no multicast/broadcast */
 381
 382                 prt = ntohs(in->sin6_port);
 383                 iface = SW_IPV6_ADDRESS;
 384
 385                 break;
 386         }
 387 #endif
 388         default:
 389                 errno = ENETUNREACH;
 390                 return -1;
 391         }
 392
 393         if (prt == 0) {
 394                 errno = EINVAL;
 395                 return -1;
 396         }
 397
 398         if (is_bcast) {
 399                 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
 400                          socket_wrapper_dir());
 401                 /* the caller need to do more processing */
 402                 return 0;
 403         }
 404
 405         snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
 406                  socket_wrapper_dir(), type, iface, prt);
 407
 408         return 0;
 409 }
 410
 411 static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
 412                                int *bcast)
 413 {
 414         char type = '\0';
 415         unsigned int prt;
 416         unsigned int iface;
 417         struct stat st;
 418         int is_bcast = 0;
 419
 420         if (bcast) *bcast = 0;
 421
 422         switch (si->family) {
 423         case AF_INET: {
 424                 const struct sockaddr_in *in =
 425                     (const struct sockaddr_in *)inaddr;
 426                 unsigned int addr = ntohl(in->sin_addr.s_addr);
 427                 char u_type = '\0';
 428                 char d_type = '\0';
 429                 char b_type = '\0';
 430                 char a_type = '\0';
 431
 432                 prt = ntohs(in->sin_port);
 433
 434                 switch (si->type) {
 435                 case SOCK_STREAM:
 436                         u_type = SOCKET_TYPE_CHAR_TCP;
 437                         d_type = SOCKET_TYPE_CHAR_TCP;
 438                         break;
 439                 case SOCK_DGRAM:
 440                         u_type = SOCKET_TYPE_CHAR_UDP;
 441                         d_type = SOCKET_TYPE_CHAR_UDP;
 442                         a_type = SOCKET_TYPE_CHAR_UDP;
 443                         b_type = SOCKET_TYPE_CHAR_UDP;
 444                         break;
 445                 }
 446
 447                 if (addr == 0) {
 448                         /* 0.0.0.0 */
 449                         is_bcast = 0;
 450                         type = d_type;
 451                         iface = socket_wrapper_default_iface();
 452                 } else if (a_type && addr == 0xFFFFFFFF) {
 453                         /* 255.255.255.255 only udp */
 454                         is_bcast = 2;
 455                         type = a_type;
 456                         iface = socket_wrapper_default_iface();
 457                 } else if (b_type && addr == 0x7FFFFFFF) {
 458                         /* 127.255.255.255 only udp */
 459                         is_bcast = 1;
 460                         type = b_type;
 461                         iface = socket_wrapper_default_iface();
 462                 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
 463                         /* 127.0.0.X */
 464                         is_bcast = 0;
 465                         type = u_type;
 466                         iface = (addr & 0x000000FF);
 467                 } else {
 468                         errno = EADDRNOTAVAIL;
 469                         return -1;
 470                 }
 471                 break;
 472         }
 473 #ifdef HAVE_IPV6
 474         case AF_INET6: {
 475                 const struct sockaddr_in6 *in =
 476                     (const struct sockaddr_in6 *)inaddr;
 477
 478                 switch (si->type) {
 479                 case SOCK_STREAM:
 480                         type = SOCKET_TYPE_CHAR_TCP_V6;
 481                         break;
 482                 case SOCK_DGRAM:
 483                         type = SOCKET_TYPE_CHAR_UDP_V6;
 484                         break;
 485                 }
 486
 487                 /* XXX no multicast/broadcast */
 488
 489                 prt = ntohs(in->sin6_port);
 490                 iface = SW_IPV6_ADDRESS;
 491
 492                 break;
 493         }
 494 #endif
 495         default:
 496                 errno = ENETUNREACH;
 497                 return -1;
 498         }
 499
 500
 501         if (bcast) *bcast = is_bcast;
 502
 503         if (prt == 0) {
 504                 /* handle auto-allocation of ephemeral ports */
 505                 for (prt = 5001; prt < 10000; prt++) {
 506                         snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
 507                                  socket_wrapper_dir(), type, iface, prt);
 508                         if (stat(un->sun_path, &st) == 0) continue;
 509
 510                         set_port(si->family, prt, si->myname);
 511                         break;
 512                 }
 513                 if (prt == 10000) {
 514                         errno = ENFILE;
 515                         return -1;
 516                 }
 517         }
 518
 519         snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
 520                  socket_wrapper_dir(), type, iface, prt);
 521         return 0;
 522 }
 523
 524 static struct socket_info *find_socket_info(int fd)
 525 {
 526         struct socket_info *i;
 527         for (i = sockets; i; i = i->next) {
 528                 if (i->fd == fd)
 529                         return i;
 530         }
 531
 532         return NULL;
 533 }
 534
 535 static int sockaddr_convert_to_un(struct socket_info *si, const struct sockaddr *in_addr, socklen_t in_len,
 536                                   struct sockaddr_un *out_addr, int alloc_sock, int *bcast)
 537 {
 538         if (!out_addr)
 539                 return 0;
 540
 541         out_addr->sun_family = AF_UNIX;
 542
 543         switch (in_addr->sa_family) {
 544         case AF_INET:
 545 #ifdef HAVE_IPV6
 546         case AF_INET6:
 547 #endif
 548                 switch (si->type) {
 549                 case SOCK_STREAM:
 550                 case SOCK_DGRAM:
 551                         break;
 552                 default:
 553                         errno = ESOCKTNOSUPPORT;
 554                         return -1;
 555                 }
 556                 if (alloc_sock) {
 557                         return convert_in_un_alloc(si, in_addr, out_addr, bcast);
 558                 } else {
 559                         return convert_in_un_remote(si, in_addr, out_addr, bcast);
 560                 }
 561         default:
 562                 break;
 563         }
 564
 565         errno = EAFNOSUPPORT;
 566         return -1;
 567 }
 568
 569 static int sockaddr_convert_from_un(const struct socket_info *si,
 570                                     const struct sockaddr_un *in_addr,
 571                                     socklen_t un_addrlen,
 572                                     int family,
 573                                     struct sockaddr *out_addr,
 574                                     socklen_t *out_addrlen)
 575 {
 576         if (out_addr == NULL || out_addrlen == NULL)
 577                 return 0;
 578
 579         if (un_addrlen == 0) {
 580                 *out_addrlen = 0;
 581                 return 0;
 582         }
 583
 584         switch (family) {
 585         case AF_INET:
 586 #ifdef HAVE_IPV6
 587         case AF_INET6:
 588 #endif
 589                 switch (si->type) {
 590                 case SOCK_STREAM:
 591                 case SOCK_DGRAM:
 592                         break;
 593                 default:
 594                         errno = ESOCKTNOSUPPORT;
 595                         return -1;
 596                 }
 597                 return convert_un_in(in_addr, out_addr, out_addrlen);
 598         default:
 599                 break;
 600         }
 601
 602         errno = EAFNOSUPPORT;
 603         return -1;
 604 }
 605
 606 enum swrap_packet_type {
 607         SWRAP_CONNECT_SEND,
 608         SWRAP_CONNECT_UNREACH,
 609         SWRAP_CONNECT_RECV,
 610         SWRAP_CONNECT_ACK,
 611         SWRAP_ACCEPT_SEND,
 612         SWRAP_ACCEPT_RECV,
 613         SWRAP_ACCEPT_ACK,
 614         SWRAP_RECVFROM,
 615         SWRAP_SENDTO,
 616         SWRAP_SENDTO_UNREACH,
 617         SWRAP_PENDING_RST,
 618         SWRAP_RECV,
 619         SWRAP_RECV_RST,
 620         SWRAP_SEND,
 621         SWRAP_SEND_RST,
 622         SWRAP_CLOSE_SEND,
 623         SWRAP_CLOSE_RECV,
 624         SWRAP_CLOSE_ACK
 625 };
 626
 627 struct swrap_file_hdr {
 628         uint32_t        magic;
 629         uint16_t        version_major;
 630         uint16_t        version_minor;
 631         int32_t         timezone;
 632         uint32_t        sigfigs;
 633         uint32_t        frame_max_len;
 634 #define SWRAP_FRAME_LENGTH_MAX 0xFFFF
 635         uint32_t        link_type;
 636 };
 637 #define SWRAP_FILE_HDR_SIZE 24
 638
 639 struct swrap_packet {
 640         struct {
 641                 uint32_t seconds;
 642                 uint32_t micro_seconds;
 643                 uint32_t recorded_length;
 644                 uint32_t full_length;
 645         } frame;
 646 #define SWRAP_PACKET__FRAME_SIZE 16
 647
 648         struct {
 649                 struct {
 650                         uint8_t         ver_hdrlen;
 651                         uint8_t         tos;
 652                         uint16_t        packet_length;
 653                         uint16_t        identification;
 654                         uint8_t         flags;
 655                         uint8_t         fragment;
 656                         uint8_t         ttl;
 657                         uint8_t         protocol;
 658                         uint16_t        hdr_checksum;
 659                         uint32_t        src_addr;
 660                         uint32_t        dest_addr;
 661                 } hdr;
 662 #define SWRAP_PACKET__IP_HDR_SIZE 20
 663
 664                 union {
 665                         struct {
 666                                 uint16_t        source_port;
 667                                 uint16_t        dest_port;
 668                                 uint32_t        seq_num;
 669                                 uint32_t        ack_num;
 670                                 uint8_t         hdr_length;
 671                                 uint8_t         control;
 672                                 uint16_t        window;
 673                                 uint16_t        checksum;
 674                                 uint16_t        urg;
 675                         } tcp;
 676 #define SWRAP_PACKET__IP_P_TCP_SIZE 20
 677                         struct {
 678                                 uint16_t        source_port;
 679                                 uint16_t        dest_port;
 680                                 uint16_t        length;
 681                                 uint16_t        checksum;
 682                         } udp;
 683 #define SWRAP_PACKET__IP_P_UDP_SIZE 8
 684                         struct {
 685                                 uint8_t         type;
 686                                 uint8_t         code;
 687                                 uint16_t        checksum;
 688                                 uint32_t        unused;
 689                         } icmp;
 690 #define SWRAP_PACKET__IP_P_ICMP_SIZE 8
 691                 } p;
 692         } ip;
 693 };
 694 #define SWRAP_PACKET_SIZE 56
 695
 696 static const char *socket_wrapper_pcap_file(void)
 697 {
 698         static int initialized = 0;
 699         static const char *s = NULL;
 700         static const struct swrap_file_hdr h = { 0, };
 701         static const struct swrap_packet p = { { 0, }, { { 0, }, { { 0, } } } };
 702
 703         if (initialized == 1) {
 704                 return s;
 705         }
 706         initialized = 1;
 707
 708         /*
 709          * TODO: don't use the structs use plain buffer offsets
 710          *       and PUSH_U8(), PUSH_U16() and PUSH_U32()
 711          *
 712          * for now make sure we disable PCAP support
 713          * if the struct has alignment!
 714          */
 715         if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
 716                 return NULL;
 717         }
 718         if (sizeof(p) != SWRAP_PACKET_SIZE) {
 719                 return NULL;
 720         }
 721         if (sizeof(p.frame) != SWRAP_PACKET__FRAME_SIZE) {
 722                 return NULL;
 723         }
 724         if (sizeof(p.ip.hdr) != SWRAP_PACKET__IP_HDR_SIZE) {
 725                 return NULL;
 726         }
 727         if (sizeof(p.ip.p.tcp) != SWRAP_PACKET__IP_P_TCP_SIZE) {
 728                 return NULL;
 729         }
 730         if (sizeof(p.ip.p.udp) != SWRAP_PACKET__IP_P_UDP_SIZE) {
 731                 return NULL;
 732         }
 733         if (sizeof(p.ip.p.icmp) != SWRAP_PACKET__IP_P_ICMP_SIZE) {
 734                 return NULL;
 735         }
 736
 737         s = getenv("SOCKET_WRAPPER_PCAP_FILE");
 738         if (s == NULL) {
 739                 return NULL;
 740         }
 741         if (strncmp(s, "./", 2) == 0) {
 742                 s += 2;
 743         }
 744         return s;
 745 }
 746
 747 static struct swrap_packet *swrap_packet_init(struct timeval *tval,
 748                                               const struct sockaddr_in *src_addr,
 749                                               const struct sockaddr_in *dest_addr,
 750                                               int socket_type,
 751                                               const unsigned char *payload,
 752                                               size_t payload_len,
 753                                               unsigned long tcp_seqno,
 754                                               unsigned long tcp_ack,
 755                                               unsigned char tcp_ctl,
 756                                               int unreachable,
 757                                               size_t *_packet_len)
 758 {
 759         struct swrap_packet *ret;
 760         struct swrap_packet *packet;
 761         size_t packet_len;
 762         size_t alloc_len;
 763         size_t nonwire_len = sizeof(packet->frame);
 764         size_t wire_hdr_len = 0;
 765         size_t wire_len = 0;
 766         size_t icmp_hdr_len = 0;
 767         size_t icmp_truncate_len = 0;
 768         unsigned char protocol = 0, icmp_protocol = 0;
 769         unsigned short src_port = src_addr->sin_port;
 770         unsigned short dest_port = dest_addr->sin_port;
 771
 772         switch (socket_type) {
 773         case SOCK_STREAM:
 774                 protocol = 0x06; /* TCP */
 775                 wire_hdr_len = sizeof(packet->ip.hdr) + sizeof(packet->ip.p.tcp);
 776                 wire_len = wire_hdr_len + payload_len;
 777                 break;
 778
 779         case SOCK_DGRAM:
 780                 protocol = 0x11; /* UDP */
 781                 wire_hdr_len = sizeof(packet->ip.hdr) + sizeof(packet->ip.p.udp);
 782                 wire_len = wire_hdr_len + payload_len;
 783                 break;
 784
 785         default:
 786                 return NULL;
 787         }
 788
 789         if (unreachable) {
 790                 icmp_protocol = protocol;
 791                 protocol = 0x01; /* ICMP */
 792                 if (wire_len > 64 ) {
 793                         icmp_truncate_len = wire_len - 64;
 794                 }
 795                 icmp_hdr_len = sizeof(packet->ip.hdr) + sizeof(packet->ip.p.icmp);
 796                 wire_hdr_len += icmp_hdr_len;
 797                 wire_len += icmp_hdr_len;
 798         }
 799
 800         packet_len = nonwire_len + wire_len;
 801         alloc_len = packet_len;
 802         if (alloc_len < sizeof(struct swrap_packet)) {
 803                 alloc_len = sizeof(struct swrap_packet);
 804         }
 805         ret = (struct swrap_packet *)malloc(alloc_len);
 806         if (!ret) return NULL;
 807
 808         packet = ret;
 809
 810         packet->frame.seconds           = tval->tv_sec;
 811         packet->frame.micro_seconds     = tval->tv_usec;
 812         packet->frame.recorded_length   = wire_len - icmp_truncate_len;
 813         packet->frame.full_length       = wire_len - icmp_truncate_len;
 814
 815         packet->ip.hdr.ver_hdrlen       = 0x45; /* version 4 and 5 * 32 bit words */
 816         packet->ip.hdr.tos              = 0x00;
 817         packet->ip.hdr.packet_length    = htons(wire_len - icmp_truncate_len);
 818         packet->ip.hdr.identification   = htons(0xFFFF);
 819         packet->ip.hdr.flags            = 0x40; /* BIT 1 set - means don't fraqment */
 820         packet->ip.hdr.fragment         = htons(0x0000);
 821         packet->ip.hdr.ttl              = 0xFF;
 822         packet->ip.hdr.protocol         = protocol;
 823         packet->ip.hdr.hdr_checksum     = htons(0x0000);
 824         packet->ip.hdr.src_addr         = src_addr->sin_addr.s_addr;
 825         packet->ip.hdr.dest_addr        = dest_addr->sin_addr.s_addr;
 826
 827         if (unreachable) {
 828                 packet->ip.p.icmp.type          = 0x03; /* destination unreachable */
 829                 packet->ip.p.icmp.code          = 0x01; /* host unreachable */
 830                 packet->ip.p.icmp.checksum      = htons(0x0000);
 831                 packet->ip.p.icmp.unused        = htonl(0x00000000);
 832
 833                 /* set the ip header in the ICMP payload */
 834                 packet = (struct swrap_packet *)(((unsigned char *)ret) + icmp_hdr_len);
 835                 packet->ip.hdr.ver_hdrlen       = 0x45; /* version 4 and 5 * 32 bit words */
 836                 packet->ip.hdr.tos              = 0x00;
 837                 packet->ip.hdr.packet_length    = htons(wire_len - icmp_hdr_len);
 838                 packet->ip.hdr.identification   = htons(0xFFFF);
 839                 packet->ip.hdr.flags            = 0x40; /* BIT 1 set - means don't fraqment */
 840                 packet->ip.hdr.fragment         = htons(0x0000);
 841                 packet->ip.hdr.ttl              = 0xFF;
 842                 packet->ip.hdr.protocol         = icmp_protocol;
 843                 packet->ip.hdr.hdr_checksum     = htons(0x0000);
 844                 packet->ip.hdr.src_addr         = dest_addr->sin_addr.s_addr;
 845                 packet->ip.hdr.dest_addr        = src_addr->sin_addr.s_addr;
 846
 847                 src_port = dest_addr->sin_port;
 848                 dest_port = src_addr->sin_port;
 849         }
 850
 851         switch (socket_type) {
 852         case SOCK_STREAM:
 853                 packet->ip.p.tcp.source_port    = src_port;
 854                 packet->ip.p.tcp.dest_port      = dest_port;
 855                 packet->ip.p.tcp.seq_num        = htonl(tcp_seqno);
 856                 packet->ip.p.tcp.ack_num        = htonl(tcp_ack);
 857                 packet->ip.p.tcp.hdr_length     = 0x50; /* 5 * 32 bit words */
 858                 packet->ip.p.tcp.control        = tcp_ctl;
 859                 packet->ip.p.tcp.window         = htons(0x7FFF);
 860                 packet->ip.p.tcp.checksum       = htons(0x0000);
 861                 packet->ip.p.tcp.urg            = htons(0x0000);
 862
 863                 break;
 864
 865         case SOCK_DGRAM:
 866                 packet->ip.p.udp.source_port    = src_addr->sin_port;
 867                 packet->ip.p.udp.dest_port      = dest_addr->sin_port;
 868                 packet->ip.p.udp.length         = htons(8 + payload_len);
 869                 packet->ip.p.udp.checksum       = htons(0x0000);
 870
 871                 break;
 872         }
 873
 874         if (payload && payload_len > 0) {
 875                 unsigned char *p = (unsigned char *)ret;
 876                 p += nonwire_len;
 877                 p += wire_hdr_len;
 878                 memcpy(p, payload, payload_len);
 879         }
 880
 881         *_packet_len = packet_len - icmp_truncate_len;
 882         return ret;
 883 }
 884
 885 static int swrap_get_pcap_fd(const char *fname)
 886 {
 887         static int fd = -1;
 888
 889         if (fd != -1) return fd;
 890
 891         fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
 892         if (fd != -1) {
 893                 struct swrap_file_hdr file_hdr;
 894                 file_hdr.magic          = 0xA1B2C3D4;
 895                 file_hdr.version_major  = 0x0002;
 896                 file_hdr.version_minor  = 0x0004;
 897                 file_hdr.timezone       = 0x00000000;
 898                 file_hdr.sigfigs        = 0x00000000;
 899                 file_hdr.frame_max_len  = SWRAP_FRAME_LENGTH_MAX;
 900                 file_hdr.link_type      = 0x0065; /* 101 RAW IP */
 901
 902                 if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
 903                         close(fd);
 904                         fd = -1;
 905                 }
 906                 return fd;
 907         }
 908
 909         fd = open(fname, O_WRONLY|O_APPEND, 0644);
 910
 911         return fd;
 912 }
 913
 914 static struct swrap_packet *swrap_marshall_packet(struct socket_info *si,
 915                                                                   const struct sockaddr *addr,
 916                                                                   enum swrap_packet_type type,
 917                                                                   const void *buf, size_t len,
 918                                                                   size_t *packet_len)
 919 {
 920         const struct sockaddr_in *src_addr;
 921         const struct sockaddr_in *dest_addr;
 922         unsigned long tcp_seqno = 0;
 923         unsigned long tcp_ack = 0;
 924         unsigned char tcp_ctl = 0;
 925         int unreachable = 0;
 926
 927         struct timeval tv;
 928
 929         switch (si->family) {
 930         case AF_INET:
 931                 break;
 932         default:
 933                 return NULL;
 934         }
 935
 936         switch (type) {
 937         case SWRAP_CONNECT_SEND:
 938                 if (si->type != SOCK_STREAM) return NULL;
 939
 940                 src_addr = (const struct sockaddr_in *)si->myname;
 941                 dest_addr = (const struct sockaddr_in *)addr;
 942
 943                 tcp_seqno = si->io.pck_snd;
 944                 tcp_ack = si->io.pck_rcv;
 945                 tcp_ctl = 0x02; /* SYN */
 946
 947                 si->io.pck_snd += 1;
 948
 949                 break;
 950
 951         case SWRAP_CONNECT_RECV:
 952                 if (si->type != SOCK_STREAM) return NULL;
 953
 954                 dest_addr = (const struct sockaddr_in *)si->myname;
 955                 src_addr = (const struct sockaddr_in *)addr;
 956
 957                 tcp_seqno = si->io.pck_rcv;
 958                 tcp_ack = si->io.pck_snd;
 959                 tcp_ctl = 0x12; /** SYN,ACK */
 960
 961                 si->io.pck_rcv += 1;
 962
 963                 break;
 964
 965         case SWRAP_CONNECT_UNREACH:
 966                 if (si->type != SOCK_STREAM) return NULL;
 967
 968                 dest_addr = (const struct sockaddr_in *)si->myname;
 969                 src_addr = (const struct sockaddr_in *)addr;
 970
 971                 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
 972                 tcp_seqno = si->io.pck_snd - 1;
 973                 tcp_ack = si->io.pck_rcv;
 974                 tcp_ctl = 0x02; /* SYN */
 975                 unreachable = 1;
 976
 977                 break;
 978
 979         case SWRAP_CONNECT_ACK:
 980                 if (si->type != SOCK_STREAM) return NULL;
 981
 982                 src_addr = (const struct sockaddr_in *)si->myname;
 983                 dest_addr = (const struct sockaddr_in *)addr;
 984
 985                 tcp_seqno = si->io.pck_snd;
 986                 tcp_ack = si->io.pck_rcv;
 987                 tcp_ctl = 0x10; /* ACK */
 988
 989                 break;
 990
 991         case SWRAP_ACCEPT_SEND:
 992                 if (si->type != SOCK_STREAM) return NULL;
 993
 994                 dest_addr = (const struct sockaddr_in *)si->myname;
 995                 src_addr = (const struct sockaddr_in *)addr;
 996
 997                 tcp_seqno = si->io.pck_rcv;
 998                 tcp_ack = si->io.pck_snd;
 999                 tcp_ctl = 0x02; /* SYN */
1000
1001                 si->io.pck_rcv += 1;
1002
1003                 break;
1004
1005         case SWRAP_ACCEPT_RECV:
1006                 if (si->type != SOCK_STREAM) return NULL;
1007
1008                 src_addr = (const struct sockaddr_in *)si->myname;
1009                 dest_addr = (const struct sockaddr_in *)addr;
1010
1011                 tcp_seqno = si->io.pck_snd;
1012                 tcp_ack = si->io.pck_rcv;
1013                 tcp_ctl = 0x12; /* SYN,ACK */
1014
1015                 si->io.pck_snd += 1;
1016
1017                 break;
1018
1019         case SWRAP_ACCEPT_ACK:
1020                 if (si->type != SOCK_STREAM) return NULL;
1021
1022                 dest_addr = (const struct sockaddr_in *)si->myname;
1023                 src_addr = (const struct sockaddr_in *)addr;
1024
1025                 tcp_seqno = si->io.pck_rcv;
1026                 tcp_ack = si->io.pck_snd;
1027                 tcp_ctl = 0x10; /* ACK */
1028
1029                 break;
1030
1031         case SWRAP_SEND:
1032                 src_addr = (const struct sockaddr_in *)si->myname;
1033                 dest_addr = (const struct sockaddr_in *)si->peername;
1034
1035                 tcp_seqno = si->io.pck_snd;
1036                 tcp_ack = si->io.pck_rcv;
1037                 tcp_ctl = 0x18; /* PSH,ACK */
1038
1039                 si->io.pck_snd += len;
1040
1041                 break;
1042
1043         case SWRAP_SEND_RST:
1044                 dest_addr = (const struct sockaddr_in *)si->myname;
1045                 src_addr = (const struct sockaddr_in *)si->peername;
1046
1047                 if (si->type == SOCK_DGRAM) {
1048                         return swrap_marshall_packet(si, si->peername,
1049                                           SWRAP_SENDTO_UNREACH,
1050                                           buf, len, packet_len);
1051                 }
1052
1053                 tcp_seqno = si->io.pck_rcv;
1054                 tcp_ack = si->io.pck_snd;
1055                 tcp_ctl = 0x14; /** RST,ACK */
1056
1057                 break;
1058
1059         case SWRAP_PENDING_RST:
1060                 dest_addr = (const struct sockaddr_in *)si->myname;
1061                 src_addr = (const struct sockaddr_in *)si->peername;
1062
1063                 if (si->type == SOCK_DGRAM) {
1064                         return NULL;
1065                 }
1066
1067                 tcp_seqno = si->io.pck_rcv;
1068                 tcp_ack = si->io.pck_snd;
1069                 tcp_ctl = 0x14; /* RST,ACK */
1070
1071                 break;
1072
1073         case SWRAP_RECV:
1074                 dest_addr = (const struct sockaddr_in *)si->myname;
1075                 src_addr = (const struct sockaddr_in *)si->peername;
1076
1077                 tcp_seqno = si->io.pck_rcv;
1078                 tcp_ack = si->io.pck_snd;
1079                 tcp_ctl = 0x18; /* PSH,ACK */
1080
1081                 si->io.pck_rcv += len;
1082
1083                 break;
1084
1085         case SWRAP_RECV_RST:
1086                 dest_addr = (const struct sockaddr_in *)si->myname;
1087                 src_addr = (const struct sockaddr_in *)si->peername;
1088
1089                 if (si->type == SOCK_DGRAM) {
1090                         return NULL;
1091                 }
1092
1093                 tcp_seqno = si->io.pck_rcv;
1094                 tcp_ack = si->io.pck_snd;
1095                 tcp_ctl = 0x14; /* RST,ACK */
1096
1097                 break;
1098
1099         case SWRAP_SENDTO:
1100                 src_addr = (const struct sockaddr_in *)si->myname;
1101                 dest_addr = (const struct sockaddr_in *)addr;
1102
1103                 si->io.pck_snd += len;
1104
1105                 break;
1106
1107         case SWRAP_SENDTO_UNREACH:
1108                 dest_addr = (const struct sockaddr_in *)si->myname;
1109                 src_addr = (const struct sockaddr_in *)addr;
1110
1111                 unreachable = 1;
1112
1113                 break;
1114
1115         case SWRAP_RECVFROM:
1116                 dest_addr = (const struct sockaddr_in *)si->myname;
1117                 src_addr = (const struct sockaddr_in *)addr;
1118
1119                 si->io.pck_rcv += len;
1120
1121                 break;
1122
1123         case SWRAP_CLOSE_SEND:
1124                 if (si->type != SOCK_STREAM) return NULL;
1125
1126                 src_addr = (const struct sockaddr_in *)si->myname;
1127                 dest_addr = (const struct sockaddr_in *)si->peername;
1128
1129                 tcp_seqno = si->io.pck_snd;
1130                 tcp_ack = si->io.pck_rcv;
1131                 tcp_ctl = 0x11; /* FIN, ACK */
1132
1133                 si->io.pck_snd += 1;
1134
1135                 break;
1136
1137         case SWRAP_CLOSE_RECV:
1138                 if (si->type != SOCK_STREAM) return NULL;
1139
1140                 dest_addr = (const struct sockaddr_in *)si->myname;
1141                 src_addr = (const struct sockaddr_in *)si->peername;
1142
1143                 tcp_seqno = si->io.pck_rcv;
1144                 tcp_ack = si->io.pck_snd;
1145                 tcp_ctl = 0x11; /* FIN,ACK */
1146
1147                 si->io.pck_rcv += 1;
1148
1149                 break;
1150
1151         case SWRAP_CLOSE_ACK:
1152                 if (si->type != SOCK_STREAM) return NULL;
1153
1154                 src_addr = (const struct sockaddr_in *)si->myname;
1155                 dest_addr = (const struct sockaddr_in *)si->peername;
1156
1157                 tcp_seqno = si->io.pck_snd;
1158                 tcp_ack = si->io.pck_rcv;
1159                 tcp_ctl = 0x10; /* ACK */
1160
1161                 break;
1162         default:
1163                 return NULL;
1164         }
1165
1166         swrapGetTimeOfDay(&tv);
1167
1168         return swrap_packet_init(&tv, src_addr, dest_addr, si->type,
1169                                    (const unsigned char *)buf, len,
1170                                    tcp_seqno, tcp_ack, tcp_ctl, unreachable,
1171                                    packet_len);
1172 }
1173
1174 static void swrap_dump_packet(struct socket_info *si,
1175                                                           const struct sockaddr *addr,
1176                                                           enum swrap_packet_type type,
1177                                                           const void *buf, size_t len)
1178 {
1179         const char *file_name;
1180         struct swrap_packet *packet;
1181         size_t packet_len = 0;
1182         int fd;
1183
1184         file_name = socket_wrapper_pcap_file();
1185         if (!file_name) {
1186                 return;
1187         }
1188
1189         packet = swrap_marshall_packet(si, addr, type, buf, len, &packet_len);
1190         if (!packet) {
1191                 return;
1192         }
1193
1194         fd = swrap_get_pcap_fd(file_name);
1195         if (fd != -1) {
1196                 if (write(fd, packet, packet_len) != packet_len) {
1197                         free(packet);
1198                         return;
1199                 }
1200         }
1201
1202         free(packet);
1203 }
1204
1205 _PUBLIC_ int swrap_socket(int family, int type, int protocol)
1206 {
1207         struct socket_info *si;
1208         int fd;
1209
1210         if (!socket_wrapper_dir()) {
1211                 return real_socket(family, type, protocol);
1212         }
1213
1214         switch (family) {
1215         case AF_INET:
1216 #ifdef HAVE_IPV6
1217         case AF_INET6:
1218 #endif
1219                 break;
1220         case AF_UNIX:
1221                 return real_socket(family, type, protocol);
1222         default:
1223                 errno = EAFNOSUPPORT;
1224                 return -1;
1225         }
1226
1227         switch (type) {
1228         case SOCK_STREAM:
1229                 break;
1230         case SOCK_DGRAM:
1231                 break;
1232         default:
1233                 errno = EPROTONOSUPPORT;
1234                 return -1;
1235         }
1236
1237         switch (protocol) {
1238         case 0:
1239                 break;
1240         case 6:
1241                 if (type == SOCK_STREAM) {
1242                         break;
1243                 }
1244                 /*fall through*/
1245         case 17:
1246                 if (type == SOCK_DGRAM) {
1247                         break;
1248                 }
1249                 /*fall through*/
1250         default:
1251                 errno = EPROTONOSUPPORT;
1252                 return -1;
1253         }
1254
1255         fd = real_socket(AF_UNIX, type, 0);
1256
1257         if (fd == -1) return -1;
1258
1259         si = (struct socket_info *)calloc(1, sizeof(struct socket_info));
1260
1261         si->family = family;
1262         si->type = type;
1263         si->protocol = protocol;
1264         si->fd = fd;
1265
1266         SWRAP_DLIST_ADD(sockets, si);
1267
1268         return si->fd;
1269 }
1270
1271 _PUBLIC_ int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
1272 {
1273         struct socket_info *parent_si, *child_si;
1274         int fd;
1275         struct sockaddr_un un_addr;
1276         socklen_t un_addrlen = sizeof(un_addr);
1277         struct sockaddr_un un_my_addr;
1278         socklen_t un_my_addrlen = sizeof(un_my_addr);
1279         struct sockaddr *my_addr;
1280         socklen_t my_addrlen, len;
1281         int ret;
1282
1283         parent_si = find_socket_info(s);
1284         if (!parent_si) {
1285                 return real_accept(s, addr, addrlen);
1286         }
1287
1288         /*
1289          * assume out sockaddr have the same size as the in parent
1290          * socket family
1291          */
1292         my_addrlen = socket_length(parent_si->family);
1293         if (my_addrlen <= 0) {
1294                 errno = EINVAL;
1295                 return -1;
1296         }
1297
1298         my_addr = (struct sockaddr *)malloc(my_addrlen);
1299         if (my_addr == NULL) {
1300                 return -1;
1301         }
1302
1303         memset(&un_addr, 0, sizeof(un_addr));
1304         memset(&un_my_addr, 0, sizeof(un_my_addr));
1305
1306         ret = real_accept(s, (struct sockaddr *)&un_addr, &un_addrlen);
1307         if (ret == -1) {
1308                 free(my_addr);
1309                 return ret;
1310         }
1311
1312         fd = ret;
1313
1314         len = my_addrlen;
1315         ret = sockaddr_convert_from_un(parent_si, &un_addr, un_addrlen,
1316                                        parent_si->family, my_addr, &len);
1317         if (ret == -1) {
1318                 free(my_addr);
1319                 close(fd);
1320                 return ret;
1321         }
1322
1323         child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
1324         memset(child_si, 0, sizeof(*child_si));
1325
1326         child_si->fd = fd;
1327         child_si->family = parent_si->family;
1328         child_si->type = parent_si->type;
1329         child_si->protocol = parent_si->protocol;
1330         child_si->bound = 1;
1331         child_si->is_server = 1;
1332
1333         child_si->peername_len = len;
1334         child_si->peername = sockaddr_dup(my_addr, len);
1335
1336         if (addr != NULL && addrlen != NULL) {
1337             *addrlen = len;
1338             if (*addrlen >= len)
1339                 memcpy(addr, my_addr, len);
1340             *addrlen = 0;
1341         }
1342
1343         ret = real_getsockname(fd, (struct sockaddr *)&un_my_addr, &un_my_addrlen);
1344         if (ret == -1) {
1345                 free(child_si);
1346                 close(fd);
1347                 return ret;
1348         }
1349
1350         len = my_addrlen;
1351         ret = sockaddr_convert_from_un(child_si, &un_my_addr, un_my_addrlen,
1352                                        child_si->family, my_addr, &len);
1353         if (ret == -1) {
1354                 free(child_si);
1355                 free(my_addr);
1356                 close(fd);
1357                 return ret;
1358         }
1359
1360         child_si->myname_len = len;
1361         child_si->myname = sockaddr_dup(my_addr, len);
1362         free(my_addr);
1363
1364         SWRAP_DLIST_ADD(sockets, child_si);
1365
1366         swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
1367         swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
1368         swrap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
1369
1370         return fd;
1371 }
1372
1373 static int autobind_start_init;
1374 static int autobind_start;
1375
1376 /* using sendto() or connect() on an unbound socket would give the
1377    recipient no way to reply, as unlike UDP and TCP, a unix domain
1378    socket can't auto-assign emphemeral port numbers, so we need to
1379    assign it here */
1380 static int swrap_auto_bind(struct socket_info *si)
1381 {
1382         struct sockaddr_un un_addr;
1383         int i;
1384         char type;
1385         int ret;
1386         int port;
1387         struct stat st;
1388
1389         if (autobind_start_init != 1) {
1390                 autobind_start_init = 1;
1391                 autobind_start = getpid();
1392                 autobind_start %= 50000;
1393                 autobind_start += 10000;
1394         }
1395
1396         un_addr.sun_family = AF_UNIX;
1397
1398         switch (si->family) {
1399         case AF_INET: {
1400                 struct sockaddr_in in;
1401
1402                 switch (si->type) {
1403                 case SOCK_STREAM:
1404                         type = SOCKET_TYPE_CHAR_TCP;
1405                         break;
1406                 case SOCK_DGRAM:
1407                         type = SOCKET_TYPE_CHAR_UDP;
1408                         break;
1409                 default:
1410                     errno = ESOCKTNOSUPPORT;
1411                     return -1;
1412                 }
1413
1414                 memset(&in, 0, sizeof(in));
1415                 in.sin_family = AF_INET;
1416                 in.sin_addr.s_addr = htonl(127<<24 |
1417                                            socket_wrapper_default_iface());
1418
1419                 si->myname_len = sizeof(in);
1420                 si->myname = sockaddr_dup(&in, si->myname_len);
1421                 break;
1422         }
1423 #ifdef HAVE_IPV6
1424         case AF_INET6: {
1425                 struct sockaddr_in6 in6;
1426
1427                 switch (si->type) {
1428                 case SOCK_STREAM:
1429                         type = SOCKET_TYPE_CHAR_TCP_V6;
1430                         break;
1431                 case SOCK_DGRAM:
1432                         type = SOCKET_TYPE_CHAR_UDP_V6;
1433                         break;
1434                 default:
1435                     errno = ESOCKTNOSUPPORT;
1436                     return -1;
1437                 }
1438
1439                 memset(&in6, 0, sizeof(in6));
1440                 in6.sin6_family = AF_INET6;
1441                 in6.sin6_addr.s6_addr[0] = SW_IPV6_ADDRESS;
1442                 si->myname_len = sizeof(in6);
1443                 si->myname = sockaddr_dup(&in6, si->myname_len);
1444                 break;
1445         }
1446 #endif
1447         default:
1448                 errno = ESOCKTNOSUPPORT;
1449                 return -1;
1450         }
1451
1452         if (autobind_start > 60000) {
1453                 autobind_start = 10000;
1454         }
1455
1456         for (i=0;i<1000;i++) {
1457                 port = autobind_start + i;
1458                 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path),
1459                          "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
1460                          type, socket_wrapper_default_iface(), port);
1461                 if (stat(un_addr.sun_path, &st) == 0) continue;
1462
1463                 ret = real_bind(si->fd, (struct sockaddr *)&un_addr, sizeof(un_addr));
1464                 if (ret == -1) return ret;
1465
1466                 si->tmp_path = strdup(un_addr.sun_path);
1467                 si->bound = 1;
1468                 autobind_start = port + 1;
1469                 break;
1470         }
1471         if (i == 1000) {
1472                 errno = ENFILE;
1473                 return -1;
1474         }
1475
1476         set_port(si->family, port, si->myname);
1477
1478         return 0;
1479 }
1480
1481
1482 _PUBLIC_ int swrap_connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
1483 {
1484         int ret;
1485         struct sockaddr_un un_addr;
1486         struct socket_info *si = find_socket_info(s);
1487
1488         if (!si) {
1489                 return real_connect(s, serv_addr, addrlen);
1490         }
1491
1492         if (si->bound == 0) {
1493                 ret = swrap_auto_bind(si);
1494                 if (ret == -1) return -1;
1495         }
1496
1497         if (si->family != serv_addr->sa_family) {
1498                 errno = EINVAL;
1499                 return -1;
1500         }
1501
1502         ret = sockaddr_convert_to_un(si, (const struct sockaddr *)serv_addr, addrlen, &un_addr, 0, NULL);
1503         if (ret == -1) return -1;
1504
1505         swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
1506
1507         ret = real_connect(s, (struct sockaddr *)&un_addr,
1508                            sizeof(struct sockaddr_un));
1509
1510         /* to give better errors */
1511         if (ret == -1 && errno == ENOENT) {
1512                 errno = EHOSTUNREACH;
1513         }
1514
1515         if (ret == 0) {
1516                 si->peername_len = addrlen;
1517                 si->peername = sockaddr_dup(serv_addr, addrlen);
1518
1519                 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
1520                 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
1521         } else {
1522                 swrap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
1523         }
1524
1525         return ret;
1526 }
1527
1528 _PUBLIC_ int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
1529 {
1530         int ret;
1531         struct sockaddr_un un_addr;
1532         struct socket_info *si = find_socket_info(s);
1533
1534         if (!si) {
1535                 return real_bind(s, myaddr, addrlen);
1536         }
1537
1538         si->myname_len = addrlen;
1539         si->myname = sockaddr_dup(myaddr, addrlen);
1540
1541         ret = sockaddr_convert_to_un(si, (const struct sockaddr *)myaddr, addrlen, &un_addr, 1, &si->bcast);
1542         if (ret == -1) return -1;
1543
1544         unlink(un_addr.sun_path);
1545
1546         ret = real_bind(s, (struct sockaddr *)&un_addr,
1547                         sizeof(struct sockaddr_un));
1548
1549         if (ret == 0) {
1550                 si->bound = 1;
1551         }
1552
1553         return ret;
1554 }
1555
1556 _PUBLIC_ int swrap_listen(int s, int backlog)
1557 {
1558         int ret;
1559         struct socket_info *si = find_socket_info(s);
1560
1561         if (!si) {
1562                 return real_listen(s, backlog);
1563         }
1564
1565         ret = real_listen(s, backlog);
1566
1567         return ret;
1568 }
1569
1570 _PUBLIC_ int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
1571 {
1572         struct socket_info *si = find_socket_info(s);
1573
1574         if (!si) {
1575                 return real_getpeername(s, name, addrlen);
1576         }
1577
1578         if (!si->peername)
1579         {
1580                 errno = ENOTCONN;
1581                 return -1;
1582         }
1583
1584         memcpy(name, si->peername, si->peername_len);
1585         *addrlen = si->peername_len;
1586
1587         return 0;
1588 }
1589
1590 _PUBLIC_ int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
1591 {
1592         struct socket_info *si = find_socket_info(s);
1593
1594         if (!si) {
1595                 return real_getsockname(s, name, addrlen);
1596         }
1597
1598         memcpy(name, si->myname, si->myname_len);
1599         *addrlen = si->myname_len;
1600
1601         return 0;
1602 }
1603
1604 _PUBLIC_ int swrap_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
1605 {
1606         struct socket_info *si = find_socket_info(s);
1607
1608         if (!si) {
1609                 return real_getsockopt(s, level, optname, optval, optlen);
1610         }
1611
1612         if (level == SOL_SOCKET) {
1613                 return real_getsockopt(s, level, optname, optval, optlen);
1614         }
1615
1616         errno = ENOPROTOOPT;
1617         return -1;
1618 }
1619
1620 _PUBLIC_ int swrap_setsockopt(int s, int  level,  int  optname,  const  void  *optval, socklen_t optlen)
1621 {
1622         struct socket_info *si = find_socket_info(s);
1623
1624         if (!si) {
1625                 return real_setsockopt(s, level, optname, optval, optlen);
1626         }
1627
1628         if (level == SOL_SOCKET) {
1629                 return real_setsockopt(s, level, optname, optval, optlen);
1630         }
1631
1632         switch (si->family) {
1633         case AF_INET:
1634                 return 0;
1635         default:
1636                 errno = ENOPROTOOPT;
1637                 return -1;
1638         }
1639 }
1640
1641 _PUBLIC_ ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen)
1642 {
1643         struct sockaddr_un un_addr;
1644         socklen_t un_addrlen = sizeof(un_addr);
1645         int ret;
1646         struct socket_info *si = find_socket_info(s);
1647
1648         if (!si) {
1649                 return real_recvfrom(s, buf, len, flags, from, fromlen);
1650         }
1651
1652         len = MIN(len, 1500);
1653
1654         /* irix 6.4 forgets to null terminate the sun_path string :-( */
1655         memset(&un_addr, 0, sizeof(un_addr));
1656         ret = real_recvfrom(s, buf, len, flags, (struct sockaddr *)&un_addr, &un_addrlen);
1657         if (ret == -1)
1658                 return ret;
1659
1660         if (sockaddr_convert_from_un(si, &un_addr, un_addrlen,
1661                                      si->family, from, fromlen) == -1) {
1662                 return -1;
1663         }
1664
1665         swrap_dump_packet(si, from, SWRAP_RECVFROM, buf, ret);
1666
1667         return ret;
1668 }
1669
1670
1671 _PUBLIC_ ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags, const struct sockaddr *to, socklen_t tolen)
1672 {
1673         struct sockaddr_un un_addr;
1674         int ret;
1675         struct socket_info *si = find_socket_info(s);
1676         int bcast = 0;
1677
1678         if (!si) {
1679                 return real_sendto(s, buf, len, flags, to, tolen);
1680         }
1681
1682         len = MIN(len, 1500);
1683
1684         switch (si->type) {
1685         case SOCK_STREAM:
1686                 ret = real_send(s, buf, len, flags);
1687                 break;
1688         case SOCK_DGRAM:
1689                 if (si->bound == 0) {
1690                         ret = swrap_auto_bind(si);
1691                         if (ret == -1) return -1;
1692                 }
1693
1694                 ret = sockaddr_convert_to_un(si, to, tolen, &un_addr, 0, &bcast);
1695                 if (ret == -1) return -1;
1696
1697                 if (bcast) {
1698                         struct stat st;
1699                         unsigned int iface;
1700                         unsigned int prt = ntohs(((const struct sockaddr_in *)to)->sin_port);
1701                         char type;
1702
1703                         type = SOCKET_TYPE_CHAR_UDP;
1704
1705                         for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
1706                                 snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
1707                                          socket_wrapper_dir(), type, iface, prt);
1708                                 if (stat(un_addr.sun_path, &st) != 0) continue;
1709
1710                                 /* ignore the any errors in broadcast sends */
1711                                 real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1712                         }
1713
1714                         swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1715
1716                         return len;
1717                 }
1718
1719                 ret = real_sendto(s, buf, len, flags, (struct sockaddr *)&un_addr, sizeof(un_addr));
1720                 break;
1721         default:
1722                 ret = -1;
1723                 errno = EHOSTUNREACH;
1724                 break;
1725         }
1726
1727         /* to give better errors */
1728         if (ret == -1 && errno == ENOENT) {
1729                 errno = EHOSTUNREACH;
1730         }
1731
1732         if (ret == -1) {
1733                 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
1734                 swrap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
1735         } else {
1736                 swrap_dump_packet(si, to, SWRAP_SENDTO, buf, ret);
1737         }
1738
1739         return ret;
1740 }
1741
1742 _PUBLIC_ int swrap_ioctl(int s, int r, void *p)
1743 {
1744         int ret;
1745         struct socket_info *si = find_socket_info(s);
1746         int value;
1747
1748         if (!si) {
1749                 return real_ioctl(s, r, p);
1750         }
1751
1752         ret = real_ioctl(s, r, p);
1753
1754         switch (r) {
1755         case FIONREAD:
1756                 value = *((int *)p);
1757                 if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1758                         swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1759                 } else if (value == 0) { /* END OF FILE */
1760                         swrap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
1761                 }
1762                 break;
1763         }
1764
1765         return ret;
1766 }
1767
1768 _PUBLIC_ ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
1769 {
1770         int ret;
1771         struct socket_info *si = find_socket_info(s);
1772
1773         if (!si) {
1774                 return real_recv(s, buf, len, flags);
1775         }
1776
1777         len = MIN(len, 1500);
1778
1779         ret = real_recv(s, buf, len, flags);
1780         if (ret == -1 && errno != EAGAIN && errno != ENOBUFS) {
1781                 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
1782         } else if (ret == 0) { /* END OF FILE */
1783                 swrap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
1784         } else if (ret > 0) {
1785                 swrap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
1786         }
1787
1788         return ret;
1789 }
1790
1791
1792 _PUBLIC_ ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
1793 {
1794         int ret;
1795         struct socket_info *si = find_socket_info(s);
1796
1797         if (!si) {
1798                 return real_send(s, buf, len, flags);
1799         }
1800
1801         len = MIN(len, 1500);
1802
1803         ret = real_send(s, buf, len, flags);
1804
1805         if (ret == -1) {
1806                 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
1807                 swrap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
1808         } else {
1809                 swrap_dump_packet(si, NULL, SWRAP_SEND, buf, ret);
1810         }
1811
1812         return ret;
1813 }
1814
1815 _PUBLIC_ int swrap_close(int fd)
1816 {
1817         struct socket_info *si = find_socket_info(fd);
1818         int ret;
1819
1820         if (!si) {
1821                 return real_close(fd);
1822         }
1823
1824         SWRAP_DLIST_REMOVE(sockets, si);
1825
1826         if (si->myname && si->peername) {
1827                 swrap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
1828         }
1829
1830         ret = real_close(fd);
1831
1832         if (si->myname && si->peername) {
1833                 swrap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
1834                 swrap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
1835         }
1836
1837         if (si->path) free(si->path);
1838         if (si->myname) free(si->myname);
1839         if (si->peername) free(si->peername);
1840         if (si->tmp_path) {
1841                 unlink(si->tmp_path);
1842                 free(si->tmp_path);
1843         }
1844         free(si);
1845
1846         return ret;
1847 }