webcit/tcp_sockets.c

   1 /*
   2  * Copyright (c) 1987-2012 by the citadel.org team
   3  *
   4  * This program is open source software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 3.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12
  13 /*
  14  * Uncomment this to log all communications with the Citadel server
  15 #define SERV_TRACE 1
  16  */
  17
  18 #include "webcit.h"
  19 #include "webserver.h"
  20
  21 long MaxRead = -1; /* should we do READ scattered or all at once? */
  22
  23 /*
  24  * register the timeout
  25  */
  26 RETSIGTYPE timeout(int signum)
  27 {
  28         syslog(LOG_WARNING, "Connection timed out; unable to reach citserver\n");
  29         /* no exit here, since we need to server the connection unreachable thing. exit(3); */
  30 }
  31
  32
  33 /*
  34  * Client side - connect to a unix domain socket
  35  */
  36 int uds_connectsock(char *sockpath)
  37 {
  38         struct sockaddr_un addr;
  39         int s;
  40
  41         memset(&addr, 0, sizeof(addr));
  42         addr.sun_family = AF_UNIX;
  43         strncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
  44
  45         s = socket(AF_UNIX, SOCK_STREAM, 0);
  46         if (s < 0) {
  47                 syslog(LOG_WARNING, "Can't create socket [%s]: %s\n", sockpath, strerror(errno));
  48                 return(-1);
  49         }
  50
  51         if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
  52                 syslog(LOG_WARNING, "Can't connect [%s]: %s\n", sockpath, strerror(errno));
  53                 close(s);
  54                 return(-1);
  55         }
  56         return s;
  57 }
  58
  59
  60 /*
  61  * TCP client - connect to a host/port
  62  */
  63 int tcp_connectsock(char *host, char *service)
  64 {
  65         struct in6_addr serveraddr;
  66         struct addrinfo hints;
  67         struct addrinfo *res = NULL;
  68         struct addrinfo *ai = NULL;
  69         int rc = (-1);
  70         int s = (-1);
  71
  72         if ((host == NULL) || IsEmptyStr(host))
  73                 return (-1);
  74         if ((service == NULL) || IsEmptyStr(service))
  75                 return (-1);
  76
  77         syslog(LOG_DEBUG, "tcp_connectsock(%s,%s)\n", host, service);
  78
  79         memset(&hints, 0x00, sizeof(hints));
  80         hints.ai_flags = AI_NUMERICSERV;
  81         hints.ai_family = AF_UNSPEC;
  82         hints.ai_socktype = SOCK_STREAM;
  83
  84         /*
  85          * Handle numeric IPv4 and IPv6 addresses
  86          */
  87         rc = inet_pton(AF_INET, host, &serveraddr);
  88         if (rc == 1) {                                          /* dotted quad */
  89                 hints.ai_family = AF_INET;
  90                 hints.ai_flags |= AI_NUMERICHOST;
  91         } else {
  92                 rc = inet_pton(AF_INET6, host, &serveraddr);
  93                 if (rc == 1) {                                  /* IPv6 address */
  94                         hints.ai_family = AF_INET6;
  95                         hints.ai_flags |= AI_NUMERICHOST;
  96                 }
  97         }
  98
  99         /* Begin the connection process */
 100
 101         rc = getaddrinfo(host, service, &hints, &res);
 102         if (rc != 0) {
 103                 syslog(LOG_DEBUG, "%s: %s\n", host, gai_strerror(rc));
 104                 freeaddrinfo(res);
 105                 return(-1);
 106         }
 107
 108         /*
 109          * Try all available addresses until we connect to one or until we run out.
 110          */
 111         for (ai = res; ai != NULL; ai = ai->ai_next) {
 112
 113                 if (ai->ai_family == AF_INET) syslog(LOG_DEBUG, "Trying IPv4\n");
 114                 else if (ai->ai_family == AF_INET6) syslog(LOG_DEBUG, "Trying IPv6\n");
 115                 else syslog(LOG_WARNING, "This is going to fail.\n");
 116
 117                 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 118                 if (s < 0) {
 119                         syslog(LOG_WARNING, "socket() failed: %s\n", strerror(errno));
 120                         freeaddrinfo(res);
 121                         return(-1);
 122                 }
 123                 rc = connect(s, ai->ai_addr, ai->ai_addrlen);
 124                 if (rc >= 0) {
 125                         int fdflags;
 126                         freeaddrinfo(res);
 127
 128                         fdflags = fcntl(rc, F_GETFL);
 129                         if (fdflags < 0) {
 130                                 syslog(LOG_ERR,
 131                                        "unable to get socket %d flags! %s \n",
 132                                        rc,
 133                                        strerror(errno));
 134                                 close(rc);
 135                                 return -1;
 136                         }
 137                         fdflags = fdflags | O_NONBLOCK;
 138                         if (fcntl(rc, F_SETFL, fdflags) < 0) {
 139                                 syslog(LOG_ERR,
 140                                        "unable to set socket %d nonblocking flags! %s \n",
 141                                        rc,
 142                                        strerror(errno));
 143                                 close(s);
 144                                 return -1;
 145                         }
 146
 147                         return(s);
 148                 }
 149                 else {
 150                         syslog(LOG_WARNING, "connect() failed: %s\n", strerror(errno));
 151                         close(s);
 152                 }
 153         }
 154         freeaddrinfo(res);
 155         return(-1);
 156 }
 157
 158
 159 /*
 160  *  input string from pipe
 161  */
 162 int serv_getln(char *strbuf, int bufsize)
 163 {
 164         wcsession *WCC = WC;
 165         int len;
 166
 167         *strbuf = '\0';
 168         StrBuf_ServGetln(WCC->MigrateReadLineBuf);
 169         len = StrLength(WCC->MigrateReadLineBuf);
 170         if (len > bufsize)
 171                 len = bufsize - 1;
 172         memcpy(strbuf, ChrPtr(WCC->MigrateReadLineBuf), len);
 173         FlushStrBuf(WCC->MigrateReadLineBuf);
 174         strbuf[len] = '\0';
 175 #ifdef SERV_TRACE
 176         syslog(LOG_DEBUG, "%3d<<<%s\n", WCC->serv_sock, strbuf);
 177 #endif
 178         return len;
 179 }
 180
 181
 182 int StrBuf_ServGetln(StrBuf *buf)
 183 {
 184         wcsession *WCC = WC;
 185         const char *ErrStr = NULL;
 186         int rc;
 187
 188         if (!WCC->connected)
 189                 return -1;
 190
 191         FlushStrBuf(buf);
 192         rc = StrBufTCP_read_buffered_line_fast(buf,
 193                                                WCC->ReadBuf,
 194                                                &WCC->ReadPos,
 195                                                &WCC->serv_sock,
 196                                                5, 1,
 197                                                &ErrStr);
 198         if (rc < 0)
 199         {
 200                 syslog(LOG_INFO, "StrBuf_ServGetln(): Server connection broken: %s\n",
 201                         (ErrStr)?ErrStr:"");
 202                 wc_backtrace(LOG_INFO);
 203                 if (WCC->serv_sock > 0) close(WCC->serv_sock);
 204                 WCC->serv_sock = (-1);
 205                 WCC->connected = 0;
 206                 WCC->logged_in = 0;
 207         }
 208 #ifdef SERV_TRACE
 209         else
 210         {
 211                 long pos = 0;
 212                 if (WCC->ReadPos != NULL)
 213                         pos = WCC->ReadPos - ChrPtr(WCC->ReadBuf);
 214                 syslog(LOG_DEBUG, "%3d<<<[%ld]%s\n", WC->serv_sock, pos, ChrPtr(buf));
 215         }
 216 #endif
 217         return rc;
 218 }
 219
 220 int StrBuf_ServGetBLOBBuffered(StrBuf *buf, long BlobSize)
 221 {
 222         wcsession *WCC = WC;
 223         const char *ErrStr;
 224         int rc;
 225
 226         rc = StrBufReadBLOBBuffered(buf,
 227                                     WCC->ReadBuf,
 228                                     &WCC->ReadPos,
 229                                     &WCC->serv_sock,
 230                                     1,
 231                                     BlobSize,
 232                                     NNN_TERM,
 233                                     &ErrStr);
 234         if (rc < 0)
 235         {
 236                 syslog(LOG_INFO, "StrBuf_ServGetBLOBBuffered(): Server connection broken: %s\n",
 237                         (ErrStr)?ErrStr:"");
 238                 wc_backtrace(LOG_INFO);
 239                 if (WCC->serv_sock > 0) close(WCC->serv_sock);
 240                 WCC->serv_sock = (-1);
 241                 WCC->connected = 0;
 242                 WCC->logged_in = 0;
 243         }
 244 #ifdef SERV_TRACE
 245         else
 246                 syslog(LOG_DEBUG, "%3d<<<BLOB: %d bytes\n", WC->serv_sock, StrLength(buf));
 247 #endif
 248
 249         return rc;
 250 }
 251
 252 int StrBuf_ServGetBLOB(StrBuf *buf, long BlobSize)
 253 {
 254         wcsession *WCC = WC;
 255         const char *ErrStr;
 256         int rc;
 257
 258         WCC->ReadPos = NULL;
 259         rc = StrBufReadBLOB(buf, &WCC->serv_sock, 1, BlobSize, &ErrStr);
 260         if (rc < 0)
 261         {
 262                 syslog(LOG_INFO, "StrBuf_ServGetBLOB(): Server connection broken: %s\n",
 263                         (ErrStr)?ErrStr:"");
 264                 wc_backtrace(LOG_INFO);
 265                 if (WCC->serv_sock > 0) close(WCC->serv_sock);
 266                 WCC->serv_sock = (-1);
 267                 WCC->connected = 0;
 268                 WCC->logged_in = 0;
 269         }
 270 #ifdef SERV_TRACE
 271         else
 272                 syslog(LOG_DEBUG, "%3d<<<BLOB: %d bytes\n", WC->serv_sock, StrLength(buf));
 273 #endif
 274
 275         return rc;
 276 }
 277
 278
 279 void FlushReadBuf (void)
 280 {
 281         long len;
 282         const char *pch;
 283         const char *pche;
 284         wcsession *WCC = WC;
 285
 286         len = StrLength(WCC->ReadBuf);
 287         if ((len > 0) &&
 288             (WCC->ReadPos != NULL) &&
 289             (WCC->ReadPos != StrBufNOTNULL))
 290
 291         {
 292                 pch = ChrPtr(WCC->ReadBuf);
 293                 pche = pch + len;
 294                 if (WCC->ReadPos != pche)
 295                 {
 296                         syslog(LOG_EMERG,
 297                                 "ERROR: somebody didn't eat his soup! Remaing Chars: %ld [%s]\n",
 298                                 (long)(pche - WCC->ReadPos),
 299                                 pche
 300                         );
 301                         syslog(LOG_EMERG,
 302                                 "--------------------------------------------------------------------------------\n"
 303                                 "Whole buf: [%s]\n"
 304                                 "--------------------------------------------------------------------------------\n",
 305                                 pch);
 306                         AppendImportantMessage(HKEY("Suppenkasper alert! watch your webcit logfile and get connected to your favourite opensource Crew."));
 307                 }
 308         }
 309
 310         FlushStrBuf(WCC->ReadBuf);
 311         WCC->ReadPos = NULL;
 312
 313
 314 }
 315
 316
 317 /*
 318  *  send binary to server
 319  *  buf the buffer to write to citadel server
 320  *  nbytes how many bytes to send to citadel server
 321  */
 322 int serv_write(const char *buf, int nbytes)
 323 {
 324         wcsession *WCC = WC;
 325         int bytes_written = 0;
 326         int retval;
 327
 328         FlushReadBuf();
 329         while (bytes_written < nbytes) {
 330                 retval = write(WCC->serv_sock, &buf[bytes_written],
 331                                nbytes - bytes_written);
 332                 if (retval < 1) {
 333                         const char *ErrStr = strerror(errno);
 334                         syslog(LOG_INFO, "serv_write(): Server connection broken: %s\n",
 335                                 (ErrStr)?ErrStr:"");
 336                         if (WCC->serv_sock > 0) close(WCC->serv_sock);
 337                         WCC->serv_sock = (-1);
 338                         WCC->connected = 0;
 339                         WCC->logged_in = 0;
 340                         return 0;
 341                 }
 342                 bytes_written = bytes_written + retval;
 343         }
 344         return 1;
 345 }
 346
 347
 348 /*
 349  *  send line to server
 350  *  string the line to send to the citadel server
 351  */
 352 int serv_puts(const char *string)
 353 {
 354 #ifdef SERV_TRACE
 355         syslog(LOG_DEBUG, "%3d>>>%s\n", WC->serv_sock, string);
 356 #endif
 357         FlushReadBuf();
 358
 359         if (!serv_write(string, strlen(string)))
 360                 return 0;
 361         return serv_write("\n", 1);
 362 }
 363
 364 /*
 365  *  send line to server
 366  *  string the line to send to the citadel server
 367  */
 368 int serv_putbuf(const StrBuf *string)
 369 {
 370 #ifdef SERV_TRACE
 371         syslog(LOG_DEBUG, "%3d>>>%s\n", WC->serv_sock, ChrPtr(string));
 372 #endif
 373         FlushReadBuf();
 374
 375         if (!serv_write(ChrPtr(string), StrLength(string)))
 376                 return 0;
 377         return serv_write("\n", 1);
 378 }
 379
 380
 381 /*
 382  *  convenience function to send stuff to the server
 383  *  format the formatstring
 384  *  ... the entities to insert into format
 385  */
 386 int serv_printf(const char *format,...)
 387 {
 388         va_list arg_ptr;
 389         char buf[SIZ];
 390         size_t len;
 391         int rc;
 392
 393         FlushReadBuf();
 394
 395         va_start(arg_ptr, format);
 396         vsnprintf(buf, sizeof buf, format, arg_ptr);
 397         va_end(arg_ptr);
 398
 399         len = strlen(buf);
 400         buf[len++] = '\n';
 401         buf[len] = '\0';
 402         rc = serv_write(buf, len);
 403 #ifdef SERV_TRACE
 404         syslog(LOG_DEBUG, ">>>%s", buf);
 405 #endif
 406         return rc;
 407 }
 408
 409
 410 /*
 411  * Read binary data from server into memory using a series of server READ commands.
 412  * returns the read content as StrBuf
 413  */
 414 int serv_read_binary(StrBuf *Ret, size_t total_len, StrBuf *Buf)
 415 {
 416         wcsession *WCC = WC;
 417         size_t bytes_read = 0;
 418         size_t this_block = 0;
 419         int rc = 6;
 420         int ServerRc = 6;
 421
 422         if (Ret == NULL) {
 423                 return -1;
 424         }
 425
 426         while ((bytes_read < total_len) && (ServerRc == 6)) {
 427
 428                 if (WCC->serv_sock==-1) {
 429                         FlushStrBuf(Ret);
 430                         return -1;
 431                 }
 432
 433                 serv_printf("READ "SIZE_T_FMT"|"SIZE_T_FMT, bytes_read, total_len-bytes_read);
 434                 if ( (rc = StrBuf_ServGetln(Buf) > 0) &&
 435                      (ServerRc = GetServerStatus(Buf, NULL), ServerRc == 6) )
 436                 {
 437                         if (rc < 0)
 438                                 return rc;
 439                         StrBufCutLeft(Buf, 4);
 440                         this_block = StrTol(Buf);
 441                         rc = StrBuf_ServGetBLOBBuffered(Ret, this_block);
 442                         if (rc < 0) {
 443                                 syslog(LOG_INFO, "Server connection broken during download\n");
 444                                 wc_backtrace(LOG_INFO);
 445                                 if (WCC->serv_sock > 0) close(WCC->serv_sock);
 446                                 WCC->serv_sock = (-1);
 447                                 WCC->connected = 0;
 448                                 WCC->logged_in = 0;
 449                                 return rc;
 450                         }
 451                         bytes_read += rc;
 452                 }
 453         }
 454
 455         return StrLength(Ret);
 456 }
 457
 458
 459 int client_write(StrBuf *ThisBuf)
 460 {
 461         wcsession *WCC = WC;
 462         const char *ptr, *eptr;
 463         long count;
 464         ssize_t res = 0;
 465         fd_set wset;
 466         int fdflags;
 467
 468         ptr = ChrPtr(ThisBuf);
 469         count = StrLength(ThisBuf);
 470         eptr = ptr + count;
 471
 472         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 473
 474         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
 475                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 476                         FD_ZERO(&wset);
 477                         FD_SET(WCC->Hdr->http_sock, &wset);
 478                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 479                                 syslog(LOG_INFO, "client_write: Socket select failed (%s)\n", strerror(errno));
 480                                 return -1;
 481                         }
 482                 }
 483
 484                 if ((WCC->Hdr->http_sock == -1) ||
 485                     (res = write(WCC->Hdr->http_sock,
 486                                  ptr,
 487                                  count)) == -1) {
 488                         syslog(LOG_INFO, "client_write: Socket write failed (%s)\n", strerror(errno));
 489                         wc_backtrace(LOG_INFO);
 490                         return res;
 491                 }
 492                 count -= res;
 493                 ptr += res;
 494         }
 495         return 0;
 496 }
 497
 498 /*
 499  * Read binary data from server into memory using a series of server READ commands.
 500  * returns the read content as StrBuf
 501  */
 502 void serv_read_binary_to_http(StrBuf *MimeType, size_t total_len, int is_static, int detect_mime)
 503 {
 504         wcsession *WCC = WC;
 505         size_t bytes_read = 0;
 506         size_t this_block = 0;
 507         int rc = 6;
 508         int ServerRc = 6;
 509         int first = 1;
 510         int chunked = 0;
 511         StrBuf *BufHeader;
 512         StrBuf *Buf;
 513
 514
 515         if (WCC->Hdr->HaveRange)
 516         {
 517                 WCC->Hdr->HaveRange++;
 518                 WCC->Hdr->TotalBytes = total_len;
 519                 /* open range? or beyound file border? correct the numbers. */
 520                 if ((WCC->Hdr->RangeTil == -1) || (WCC->Hdr->RangeTil>= total_len))
 521                         WCC->Hdr->RangeTil = total_len - 1;
 522                 bytes_read = WCC->Hdr->RangeStart;
 523                 total_len = WCC->Hdr->RangeTil;
 524         }
 525         else
 526                 chunked = total_len > SIZ * 10; /* TODO: disallow for HTTP / 1.0 */
 527
 528         if (chunked)
 529         {
 530                 BufHeader=NewStrBuf();
 531         }
 532         Buf = NewStrBuf();
 533
 534         http_transmit_headers(ChrPtr(MimeType), is_static, chunked);
 535 #ifdef HAVE_OPENSSL
 536         if (is_https)
 537                 client_write_ssl(WCC->HBuf);
 538         else
 539 #endif
 540                 client_write(WCC->HBuf);
 541
 542         while ((bytes_read < total_len) && (ServerRc == 6)) {
 543
 544                 if (WCC->serv_sock==-1) {
 545                         FlushStrBuf(WCC->WBuf);
 546                         return;
 547                 }
 548
 549                 serv_printf("READ "SIZE_T_FMT"|"SIZE_T_FMT, bytes_read, total_len-bytes_read);
 550                 if ( (rc = StrBuf_ServGetln(Buf) > 0) &&
 551                      (ServerRc = GetServerStatus(Buf, NULL), ServerRc == 6) )
 552                 {
 553                         if (rc < 0)
 554                                 return;
 555                         StrBufCutLeft(Buf, 4);
 556                         this_block = StrTol(Buf);
 557                         rc = StrBuf_ServGetBLOBBuffered(WCC->WBuf, this_block);
 558                         if (rc < 0) {
 559                                 syslog(LOG_INFO, "Server connection broken during download\n");
 560                                 wc_backtrace(LOG_INFO);
 561                                 if (WCC->serv_sock > 0) close(WCC->serv_sock);
 562                                 WCC->serv_sock = (-1);
 563                                 WCC->connected = 0;
 564                                 WCC->logged_in = 0;
 565                                 return;
 566                         }
 567                         bytes_read += rc;
 568
 569                 }
 570
 571                 if (chunked)
 572                 {
 573                         StrBufPrintf(BufHeader, "%s%x\r\n",
 574                                      (first)?"":"\r\n",
 575                                      StrLength (WCC->WBuf));
 576 #ifdef HAVE_OPENSSL
 577                         if (is_https)
 578                                 rc = client_write_ssl(BufHeader);
 579                         else
 580 #endif
 581                                 rc = client_write(BufHeader);
 582                         if (rc < 0)
 583                                 break;
 584                 }
 585
 586 #ifdef HAVE_OPENSSL
 587                 if (is_https)
 588                         rc = client_write_ssl(WCC->WBuf);
 589                 else
 590 #endif
 591                         rc = client_write(WCC->WBuf);
 592
 593                 if (rc < 0)
 594                         break;
 595                 first = 0;
 596                 FlushStrBuf(WCC->WBuf);
 597         }
 598
 599         if (chunked)
 600         {
 601                 StrBufPrintf(BufHeader, "\r\n0\r\n\r\n");
 602 #ifdef HAVE_OPENSSL
 603                 if (is_https)
 604                         rc = client_write_ssl(BufHeader);
 605                 else
 606 #endif
 607                         rc = client_write(BufHeader);
 608         }
 609
 610 }
 611
 612 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 613 {
 614         const char *Error;
 615 #ifdef HAVE_OPENSSL
 616         const char *pch, *pchs;
 617         int rlen, len, retval = 0;
 618
 619         if (is_https) {
 620                 int ntries = 0;
 621                 if (StrLength(Hdr->ReadBuf) > 0)
 622                 {
 623                         pchs = ChrPtr(Hdr->ReadBuf);
 624                         pch = strchr(pchs, '\n');
 625                         if (pch != NULL) {
 626                                 rlen = 0;
 627                                 len = pch - pchs;
 628                                 if (len > 0 && (*(pch - 1) == '\r') )
 629                                         rlen ++;
 630                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 631                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 632                                 return len - rlen;
 633                         }
 634                 }
 635
 636                 while (retval == 0) {
 637                                 pch = NULL;
 638                                 pchs = ChrPtr(Hdr->ReadBuf);
 639                                 if (*pchs != '\0')
 640                                         pch = strchr(pchs, '\n');
 641                                 if (pch == NULL) {
 642                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 643                                         pchs = ChrPtr(Hdr->ReadBuf);
 644                                         pch = strchr(pchs, '\n');
 645                                         if (pch == NULL)
 646                                                 retval = 0;
 647                                 }
 648                                 if (retval == 0) {
 649                                         sleeeeeeeeeep(1);
 650                                         ntries ++;
 651                                 }
 652                                 if (ntries > 10)
 653                                         return 0;
 654                 }
 655                 if ((retval > 0) && (pch != NULL)) {
 656                         rlen = 0;
 657                         len = pch - pchs;
 658                         if (len > 0 && (*(pch - 1) == '\r') )
 659                                 rlen ++;
 660                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 661                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 662                         return len - rlen;
 663
 664                 }
 665                 else
 666                         return -1;
 667         }
 668         else
 669 #endif
 670                 return StrBufTCP_read_buffered_line_fast(Target,
 671                                                          Hdr->ReadBuf,
 672                                                          &Hdr->Pos,
 673                                                          &Hdr->http_sock,
 674                                                          5,
 675                                                          1,
 676                                                          &Error);
 677 }
 678
 679
 680 /*
 681  * This is a generic function to set up a master socket for listening on
 682  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 683  *
 684  * ip_addr      IP address to bind
 685  * port_number  port number to bind
 686  * queue_len    number of incoming connections to allow in the queue
 687  */
 688 int webcit_tcp_server(const char *ip_addr, int port_number, int queue_len)
 689 {
 690         const char *ipv4broadcast = "0.0.0.0";
 691         int IsDefault = 0;
 692         struct protoent *p;
 693         struct sockaddr_in6 sin6;
 694         struct sockaddr_in sin4;
 695         int s, i, b;
 696         int ip_version = 6;
 697
 698 retry:
 699         memset(&sin6, 0, sizeof(sin6));
 700         memset(&sin4, 0, sizeof(sin4));
 701         sin6.sin6_family = AF_INET6;
 702         sin4.sin_family = AF_INET;
 703
 704         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 705                 || (IsEmptyStr(ip_addr))
 706                 || (!strcmp(ip_addr, "*"))
 707         ) {
 708                 IsDefault = 1;
 709                 ip_version = 6;
 710                 sin6.sin6_addr = in6addr_any;
 711         }
 712         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 713         {
 714                 ip_version = 4;
 715                 sin4.sin_addr.s_addr = INADDR_ANY;
 716         }
 717         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 718         {
 719                 ip_version = 4;
 720                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 721                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 722                         return (-WC_EXIT_BIND);
 723                 }
 724         }
 725         else                                                                            /* specific IPv6 */
 726         {
 727                 ip_version = 6;
 728                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 729                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 730                         return (-WC_EXIT_BIND);
 731                 }
 732         }
 733
 734         if (port_number == 0) {
 735                 syslog(LOG_WARNING, "Cannot start: no port number specified.\n");
 736                 return (-WC_EXIT_BIND);
 737         }
 738         sin6.sin6_port = htons((u_short) port_number);
 739         sin4.sin_port = htons((u_short) port_number);
 740
 741         p = getprotobyname("tcp");
 742
 743         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 744         if (s < 0) {
 745                 if (IsDefault && (errno == EAFNOSUPPORT))
 746                 {
 747                         s = 0;
 748                         ip_addr = ipv4broadcast;
 749                         goto retry;
 750                 }
 751                 syslog(LOG_WARNING, "Can't create a listening socket: %s\n", strerror(errno));
 752                 return (-WC_EXIT_BIND);
 753         }
 754         /* Set some socket options that make sense. */
 755         i = 1;
 756         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 757
 758         if (ip_version == 6) {
 759                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 760         }
 761         else {
 762                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 763         }
 764
 765         if (b < 0) {
 766                 syslog(LOG_EMERG, "Can't bind: %s\n", strerror(errno));
 767                 close(s);
 768                 return (-WC_EXIT_BIND);
 769         }
 770
 771         if (listen(s, queue_len) < 0) {
 772                 syslog(LOG_EMERG, "Can't listen: %s\n", strerror(errno));
 773                 close(s);
 774                 return (-WC_EXIT_BIND);
 775         }
 776         return (s);
 777 }
 778
 779
 780 /*
 781  * Create a Unix domain socket and listen on it
 782  * sockpath - file name of the unix domain socket
 783  * queue_len - Number of incoming connections to allow in the queue
 784  */
 785 int webcit_uds_server(char *sockpath, int queue_len)
 786 {
 787         struct sockaddr_un addr;
 788         int s;
 789         int i;
 790         int actual_queue_len;
 791
 792         actual_queue_len = queue_len;
 793         if (actual_queue_len < 5) actual_queue_len = 5;
 794
 795         i = unlink(sockpath);
 796         if ((i != 0) && (errno != ENOENT)) {
 797                 syslog(LOG_WARNING, "webcit: can't unlink %s: %s\n",
 798                         sockpath, strerror(errno));
 799                 return (-WC_EXIT_BIND);
 800         }
 801
 802         memset(&addr, 0, sizeof(addr));
 803         addr.sun_family = AF_UNIX;
 804         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 805
 806         s = socket(AF_UNIX, SOCK_STREAM, 0);
 807         if (s < 0) {
 808                 syslog(LOG_WARNING, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 809                 return (-WC_EXIT_BIND);
 810         }
 811
 812         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 813                 syslog(LOG_WARNING, "webcit: Can't bind: %s\n", strerror(errno));
 814                 close(s);
 815                 return (-WC_EXIT_BIND);
 816         }
 817
 818         if (listen(s, actual_queue_len) < 0) {
 819                 syslog(LOG_WARNING, "webcit: Can't listen: %s\n", strerror(errno));
 820                 close(s);
 821                 return (-WC_EXIT_BIND);
 822         }
 823
 824         chmod(sockpath, 0777);
 825         return(s);
 826 }
 827
 828
 829
 830
 831 /*
 832  * Read data from the client socket.
 833  *
 834  * sock         socket fd to read from
 835  * buf          buffer to read into
 836  * bytes        number of bytes to read
 837  * timeout      Number of seconds to wait before timing out
 838  *
 839  * Possible return values:
 840  *      1       Requested number of bytes has been read.
 841  *      0       Request timed out.
 842  *      -1      Connection is broken, or other error.
 843  */
 844 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 845 {
 846         const char *Error;
 847         int retval = 0;
 848
 849 #ifdef HAVE_OPENSSL
 850         if (is_https) {
 851                 long bufremain = 0;
 852                 long baselen;
 853
 854                 baselen = StrLength(Target);
 855
 856                 if (Hdr->Pos == NULL)
 857                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 858
 859                 if (StrLength(Hdr->ReadBuf) > 0)
 860                 {
 861                         bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 862
 863                         if (bytes < bufremain)
 864                                 bufremain = bytes;
 865                         StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 866                         StrBufCutLeft(Hdr->ReadBuf, bufremain);
 867                 }
 868
 869                 if (bytes > bufremain)
 870                 {
 871                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 872                                (retval >= 0))
 873                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 874                         if (retval >= 0) {
 875                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 876                                 return 1;
 877                         }
 878                         else {
 879                                 syslog(LOG_INFO, "client_read_ssl() failed\n");
 880                                 return -1;
 881                         }
 882                 }
 883                 else
 884                         return 1;
 885         }
 886 #endif
 887
 888         retval = StrBufReadBLOBBuffered(Target,
 889                                         Hdr->ReadBuf,
 890                                         &Hdr->Pos,
 891                                         &Hdr->http_sock,
 892                                         1,
 893                                         bytes,
 894                                         O_TERM,
 895                                         &Error);
 896         if (retval < 0) {
 897                 syslog(LOG_INFO, "client_read() failed: %s\n",
 898                         Error);
 899                 wc_backtrace(LOG_DEBUG);
 900                 return retval;
 901         }
 902
 903         return 1;
 904 }
 905
 906
 907 /*
 908  * Begin buffering HTTP output so we can transmit it all in one write operation later.
 909  */
 910 void begin_burst(void)
 911 {
 912         if (WC->WBuf == NULL) {
 913                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 914         }
 915 }
 916
 917
 918 /*
 919  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
 920  */
 921 long end_burst(void)
 922 {
 923         wcsession *WCC = WC;
 924         const char *ptr, *eptr;
 925         long count;
 926         ssize_t res = 0;
 927         fd_set wset;
 928         int fdflags;
 929
 930         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
 931         {
 932                 if (CompressBuffer(WCC->WBuf) > 0)
 933                         hprintf("Content-encoding: gzip\r\n");
 934                 else {
 935                         syslog(LOG_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
 936                         wc_backtrace(LOG_INFO);
 937                 }
 938         }
 939
 940         if (WCC->WFBuf != NULL) {
 941                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
 942                 FreeStrBuf(&WCC->WFBuf);
 943         }
 944
 945         if (WCC->Hdr->HR.prohibit_caching)
 946                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
 947         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
 948
 949         ptr = ChrPtr(WCC->HBuf);
 950         count = StrLength(WCC->HBuf);
 951         eptr = ptr + count;
 952
 953 #ifdef HAVE_OPENSSL
 954         if (is_https) {
 955                 client_write_ssl(WCC->HBuf);
 956                 client_write_ssl(WCC->WBuf);
 957                 return (count);
 958         }
 959 #endif
 960
 961         if (WCC->Hdr->http_sock == -1)
 962                 return -1;
 963         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 964
 965         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
 966                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 967                         FD_ZERO(&wset);
 968                         FD_SET(WCC->Hdr->http_sock, &wset);
 969                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 970                                 syslog(LOG_DEBUG, "client_write: Socket select failed (%s)\n", strerror(errno));
 971                                 return -1;
 972                         }
 973                 }
 974
 975                 if ((WCC->Hdr->http_sock == -1) ||
 976                     (res = write(WCC->Hdr->http_sock,
 977                                  ptr,
 978                                  count)) == -1) {
 979                         syslog(LOG_DEBUG, "client_write: Socket write failed (%s)\n", strerror(errno));
 980                         wc_backtrace(LOG_INFO);
 981                         return res;
 982                 }
 983                 count -= res;
 984                 ptr += res;
 985         }
 986
 987         ptr = ChrPtr(WCC->WBuf);
 988         count = StrLength(WCC->WBuf);
 989         eptr = ptr + count;
 990
 991         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
 992                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 993                         FD_ZERO(&wset);
 994                         FD_SET(WCC->Hdr->http_sock, &wset);
 995                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 996                                 syslog(LOG_INFO, "client_write: Socket select failed (%s)\n", strerror(errno));
 997                                 return -1;
 998                         }
 999                 }
1000
1001                 if ((WCC->Hdr->http_sock == -1) ||
1002                     (res = write(WCC->Hdr->http_sock,
1003                                  ptr,
1004                                  count)) == -1) {
1005                         syslog(LOG_INFO, "client_write: Socket write failed (%s)\n", strerror(errno));
1006                         wc_backtrace(LOG_INFO);
1007                         return res;
1008                 }
1009                 count -= res;
1010                 ptr += res;
1011         }
1012
1013         return StrLength(WCC->WBuf);
1014 }
1015
1016
1017 /*
1018  * lingering_close() a`la Apache. see
1019  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
1020  */
1021 int lingering_close(int fd)
1022 {
1023         char buf[SIZ];
1024         int i;
1025         fd_set set;
1026         struct timeval tv, start;
1027
1028         gettimeofday(&start, NULL);
1029         if (fd == -1)
1030                 return -1;
1031         shutdown(fd, 1);
1032         do {
1033                 do {
1034                         gettimeofday(&tv, NULL);
1035                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
1036                         tv.tv_usec = start.tv_usec - tv.tv_usec;
1037                         if (tv.tv_usec < 0) {
1038                                 tv.tv_sec--;
1039                                 tv.tv_usec += 1000000;
1040                         }
1041                         FD_ZERO(&set);
1042                         FD_SET(fd, &set);
1043                         i = select(fd + 1, &set, NULL, NULL, &tv);
1044                 } while (i == -1 && errno == EINTR);
1045
1046                 if (i <= 0)
1047                         break;
1048
1049                 i = read(fd, buf, sizeof buf);
1050         } while (i != 0 && (i != -1 || errno == EINTR));
1051
1052         return close(fd);
1053 }
1054
1055 void
1056 HttpNewModule_TCPSOCKETS
1057 (ParsedHttpHdrs *httpreq)
1058 {
1059
1060         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
1061 }
1062
1063 void
1064 HttpDetachModule_TCPSOCKETS
1065 (ParsedHttpHdrs *httpreq)
1066 {
1067
1068         FlushStrBuf(httpreq->ReadBuf);
1069         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
1070 }
1071
1072 void
1073 HttpDestroyModule_TCPSOCKETS
1074 (ParsedHttpHdrs *httpreq)
1075 {
1076
1077         FreeStrBuf(&httpreq->ReadBuf);
1078 }
1079
1080
1081 void
1082 SessionNewModule_TCPSOCKETS
1083 (wcsession *sess)
1084 {
1085         sess->CLineBuf = NewStrBuf();
1086         sess->MigrateReadLineBuf = NewStrBuf();
1087 }
1088
1089 void
1090 SessionDestroyModule_TCPSOCKETS
1091 (wcsession *sess)
1092 {
1093         FreeStrBuf(&sess->CLineBuf);
1094         FreeStrBuf(&sess->ReadBuf);
1095         sess->connected = 0;
1096         sess->ReadPos = NULL;
1097         FreeStrBuf(&sess->MigrateReadLineBuf);
1098         if (sess->serv_sock > 0) {
1099                 syslog(LOG_DEBUG, "Closing socket %d", sess->serv_sock);
1100                 close(sess->serv_sock);
1101         }
1102         sess->serv_sock = -1;
1103 }