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, ptr, count)),
 486                      (res == -1)))
 487                 {
 488                         syslog(LOG_INFO, "client_write: Socket write failed (%s)\n", strerror(errno));
 489                         wc_backtrace(LOG_INFO);
 490                         return -1;
 491                 }
 492                 count -= res;
 493                 ptr += res;
 494         }
 495         return 0;
 496 }
 497
 498
 499 int
 500 read_serv_chunk(
 501
 502         StrBuf *Buf,
 503         size_t total_len,
 504         size_t *bytes_read
 505         )
 506 {
 507         int rc;
 508         int ServerRc;
 509         wcsession *WCC = WC;
 510
 511         serv_printf("READ "SIZE_T_FMT"|"SIZE_T_FMT, *bytes_read, total_len-(*bytes_read));
 512         if ( (rc = StrBuf_ServGetln(Buf) > 0) &&
 513              (ServerRc = GetServerStatus(Buf, NULL), ServerRc == 6) )
 514         {
 515                 size_t this_block = 0;
 516
 517                 if (rc < 0)
 518                         return rc;
 519
 520                 StrBufCutLeft(Buf, 4);
 521                 this_block = StrTol(Buf);
 522                 rc = StrBuf_ServGetBLOBBuffered(WCC->WBuf, this_block);
 523                 if (rc < 0) {
 524                         syslog(LOG_INFO, "Server connection broken during download\n");
 525                         wc_backtrace(LOG_INFO);
 526                         if (WCC->serv_sock > 0) close(WCC->serv_sock);
 527                         WCC->serv_sock = (-1);
 528                         WCC->connected = 0;
 529                         WCC->logged_in = 0;
 530                         return rc;
 531                 }
 532                 *bytes_read += rc;
 533         }
 534         return 6;
 535 }
 536
 537 static inline int send_http(StrBuf *Buf)
 538 {
 539 #ifdef HAVE_OPENSSL
 540         if (is_https)
 541                 return client_write_ssl(Buf);
 542         else
 543 #endif
 544                 return client_write(Buf);
 545 }
 546 /*
 547  * Read binary data from server into memory using a series of server READ commands.
 548  * returns the read content as StrBuf
 549  */
 550 void serv_read_binary_to_http(StrBuf *MimeType, size_t total_len, int is_static, int detect_mime)
 551 {
 552         int ServerRc = 6;
 553         wcsession *WCC = WC;
 554         size_t bytes_read = 0;
 555         int first = 1;
 556         int client_con_state = 0;
 557         int chunked = 0;
 558         int is_gzip = 0;
 559         StrBuf *BufHeader = NULL;
 560         StrBuf *Buf;
 561         StrBuf *pBuf = NULL;
 562         void *SC = NULL;
 563         IOBuffer ReadBuffer;
 564         IOBuffer WriteBuffer;
 565
 566
 567         Buf = NewStrBuf();
 568
 569         if (WCC->Hdr->HaveRange)
 570         {
 571                 WCC->Hdr->HaveRange++;
 572                 WCC->Hdr->TotalBytes = total_len;
 573                 /* open range? or beyound file border? correct the numbers. */
 574                 if ((WCC->Hdr->RangeTil == -1) || (WCC->Hdr->RangeTil>= total_len))
 575                         WCC->Hdr->RangeTil = total_len - 1;
 576                 bytes_read = WCC->Hdr->RangeStart;
 577                 total_len = WCC->Hdr->RangeTil;
 578         }
 579         else
 580                 chunked = total_len > SIZ * 10; /* TODO: disallow for HTTP / 1.0 */
 581
 582         if (chunked)
 583         {
 584                 BufHeader=NewStrBuf();
 585         }
 586
 587         if ((detect_mime != 0) && (bytes_read != 0))
 588         {
 589                 /* need to read first chunk to detect mime, though the client doesn't care */
 590                 size_t bytes_read = 0;
 591                 const char *CT;
 592
 593                 ServerRc = read_serv_chunk(
 594                         Buf,
 595                         total_len,
 596                         &bytes_read);
 597
 598                 if (ServerRc != 6)
 599                 {
 600                         FreeStrBuf(&Buf);
 601                         return;
 602                 }
 603                 CT = GuessMimeType(SKEY(WCC->WBuf));
 604                 FlushStrBuf(WCC->WBuf);
 605                 StrBufPlain(MimeType, CT, -1);
 606                 detect_mime = 0;
 607                 FreeStrBuf(&Buf);
 608         }
 609
 610         if (chunked && !DisableGzip && WCC->Hdr->HR.gzip_ok)
 611         {
 612                 is_gzip = 1;
 613                 SC = StrBufNewStreamContext (eZLibEncode);
 614
 615                 memset(&ReadBuffer, 0, sizeof(IOBuffer));
 616                 ReadBuffer.Buf = WCC->WBuf;
 617
 618                 memset(&WriteBuffer, 0, sizeof(IOBuffer));
 619                 WriteBuffer.Buf = NewStrBufPlain(NULL, SIZ*2);;
 620         }
 621         else
 622         {
 623                 pBuf = WCC->WBuf;
 624         }
 625
 626         if (!detect_mime)
 627         {
 628                 http_transmit_headers(ChrPtr(MimeType), is_static, chunked, is_gzip);
 629
 630                 if (send_http(WCC->HBuf) < 0)
 631                 {
 632                         FreeStrBuf(&Buf);
 633                         return;
 634                 }
 635         }
 636
 637         while ((bytes_read < total_len) &&
 638                (ServerRc == 6) &&
 639                (client_con_state == 0))
 640         {
 641
 642                 if (WCC->serv_sock==-1) {
 643                         FlushStrBuf(WCC->WBuf);
 644                         FreeStrBuf(&Buf);
 645                         return;
 646                 }
 647
 648                 ServerRc = read_serv_chunk(
 649                         Buf,
 650                         total_len,
 651                         &bytes_read);
 652                 if (ServerRc != 6)
 653                         break;
 654
 655                 if (detect_mime)
 656                 {
 657                         const char *CT;
 658                         detect_mime = 0;
 659
 660                         CT = GuessMimeType(SKEY(WCC->WBuf));
 661                         StrBufPlain(MimeType, CT, -1);
 662                         http_transmit_headers(ChrPtr(MimeType), is_static, chunked, is_gzip);
 663
 664                         client_con_state = send_http(WCC->HBuf);
 665                 }
 666
 667                 if (is_gzip)
 668                 {
 669                         int done = (bytes_read == total_len);
 670                         while ((IOBufferStrLength(&ReadBuffer) > 0) && (client_con_state == 0)) {
 671                                 StrBufStreamTranscode(eZLibEncode, &WriteBuffer, &ReadBuffer, NULL, -1, SC, done);
 672
 673                                 StrBufPrintf(BufHeader, "%s%x\r\n",
 674                                              (first)?"":"\r\n",
 675                                              StrLength (pBuf));
 676                                 first = 0;
 677                                 client_con_state = send_http(BufHeader);
 678                                 if (client_con_state == 0) {
 679                                         client_con_state = send_http(pBuf);
 680                                 }
 681                         }
 682                         FlushStrBuf(WCC->WBuf);
 683                 }
 684                 else {
 685                         if ((chunked) && (client_con_state == 0))
 686                         {
 687                                 StrBufPrintf(BufHeader, "%s%x\r\n",
 688                                              (first)?"":"\r\n",
 689                                              StrLength (pBuf));
 690                                 first = 0;
 691                                 client_con_state = send_http(BufHeader);
 692                         }
 693
 694                         if (client_con_state == 0)
 695                                 client_con_state = send_http(pBuf);
 696
 697                         FlushStrBuf(pBuf);
 698                 }
 699         }
 700
 701         if ((chunked) && (client_con_state == 0))
 702         {
 703                 StrBufPlain(BufHeader, HKEY("\r\n0\r\n\r\n"));
 704                 if (send_http(BufHeader) < 0)
 705                 {
 706                         FreeStrBuf(&Buf);
 707                         return;
 708                 }
 709         }
 710         FreeStrBuf(&Buf);
 711 }
 712
 713 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 714 {
 715         const char *Error;
 716 #ifdef HAVE_OPENSSL
 717         const char *pch, *pchs;
 718         int rlen, len, retval = 0;
 719
 720         if (is_https) {
 721                 int ntries = 0;
 722                 if (StrLength(Hdr->ReadBuf) > 0)
 723                 {
 724                         pchs = ChrPtr(Hdr->ReadBuf);
 725                         pch = strchr(pchs, '\n');
 726                         if (pch != NULL) {
 727                                 rlen = 0;
 728                                 len = pch - pchs;
 729                                 if (len > 0 && (*(pch - 1) == '\r') )
 730                                         rlen ++;
 731                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 732                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 733                                 return len - rlen;
 734                         }
 735                 }
 736
 737                 while (retval == 0) {
 738                                 pch = NULL;
 739                                 pchs = ChrPtr(Hdr->ReadBuf);
 740                                 if (*pchs != '\0')
 741                                         pch = strchr(pchs, '\n');
 742                                 if (pch == NULL) {
 743                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 744                                         pchs = ChrPtr(Hdr->ReadBuf);
 745                                         pch = strchr(pchs, '\n');
 746                                         if (pch == NULL)
 747                                                 retval = 0;
 748                                 }
 749                                 if (retval == 0) {
 750                                         sleeeeeeeeeep(1);
 751                                         ntries ++;
 752                                 }
 753                                 if (ntries > 10)
 754                                         return 0;
 755                 }
 756                 if ((retval > 0) && (pch != NULL)) {
 757                         rlen = 0;
 758                         len = pch - pchs;
 759                         if (len > 0 && (*(pch - 1) == '\r') )
 760                                 rlen ++;
 761                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 762                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 763                         return len - rlen;
 764
 765                 }
 766                 else
 767                         return -1;
 768         }
 769         else
 770 #endif
 771                 return StrBufTCP_read_buffered_line_fast(Target,
 772                                                          Hdr->ReadBuf,
 773                                                          &Hdr->Pos,
 774                                                          &Hdr->http_sock,
 775                                                          5,
 776                                                          1,
 777                                                          &Error);
 778 }
 779
 780
 781 /*
 782  * This is a generic function to set up a master socket for listening on
 783  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 784  *
 785  * ip_addr      IP address to bind
 786  * port_number  port number to bind
 787  * queue_len    number of incoming connections to allow in the queue
 788  */
 789 int webcit_tcp_server(const char *ip_addr, int port_number, int queue_len)
 790 {
 791         const char *ipv4broadcast = "0.0.0.0";
 792         int IsDefault = 0;
 793         struct protoent *p;
 794         struct sockaddr_in6 sin6;
 795         struct sockaddr_in sin4;
 796         int s, i, b;
 797         int ip_version = 6;
 798
 799 retry:
 800         memset(&sin6, 0, sizeof(sin6));
 801         memset(&sin4, 0, sizeof(sin4));
 802         sin6.sin6_family = AF_INET6;
 803         sin4.sin_family = AF_INET;
 804
 805         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 806                 || (IsEmptyStr(ip_addr))
 807                 || (!strcmp(ip_addr, "*"))
 808         ) {
 809                 IsDefault = 1;
 810                 ip_version = 6;
 811                 sin6.sin6_addr = in6addr_any;
 812         }
 813         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 814         {
 815                 ip_version = 4;
 816                 sin4.sin_addr.s_addr = INADDR_ANY;
 817         }
 818         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 819         {
 820                 ip_version = 4;
 821                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 822                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 823                         return (-WC_EXIT_BIND);
 824                 }
 825         }
 826         else                                                                            /* specific IPv6 */
 827         {
 828                 ip_version = 6;
 829                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 830                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 831                         return (-WC_EXIT_BIND);
 832                 }
 833         }
 834
 835         if (port_number == 0) {
 836                 syslog(LOG_WARNING, "Cannot start: no port number specified.\n");
 837                 return (-WC_EXIT_BIND);
 838         }
 839         sin6.sin6_port = htons((u_short) port_number);
 840         sin4.sin_port = htons((u_short) port_number);
 841
 842         p = getprotobyname("tcp");
 843
 844         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 845         if (s < 0) {
 846                 if (IsDefault && (errno == EAFNOSUPPORT))
 847                 {
 848                         s = 0;
 849                         ip_addr = ipv4broadcast;
 850                         goto retry;
 851                 }
 852                 syslog(LOG_WARNING, "Can't create a listening socket: %s\n", strerror(errno));
 853                 return (-WC_EXIT_BIND);
 854         }
 855         /* Set some socket options that make sense. */
 856         i = 1;
 857         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 858
 859         if (ip_version == 6) {
 860                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 861         }
 862         else {
 863                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 864         }
 865
 866         if (b < 0) {
 867                 syslog(LOG_EMERG, "Can't bind: %s\n", strerror(errno));
 868                 close(s);
 869                 return (-WC_EXIT_BIND);
 870         }
 871
 872         if (listen(s, queue_len) < 0) {
 873                 syslog(LOG_EMERG, "Can't listen: %s\n", strerror(errno));
 874                 close(s);
 875                 return (-WC_EXIT_BIND);
 876         }
 877         return (s);
 878 }
 879
 880
 881 /*
 882  * Create a Unix domain socket and listen on it
 883  * sockpath - file name of the unix domain socket
 884  * queue_len - Number of incoming connections to allow in the queue
 885  */
 886 int webcit_uds_server(char *sockpath, int queue_len)
 887 {
 888         struct sockaddr_un addr;
 889         int s;
 890         int i;
 891         int actual_queue_len;
 892
 893         actual_queue_len = queue_len;
 894         if (actual_queue_len < 5) actual_queue_len = 5;
 895
 896         i = unlink(sockpath);
 897         if ((i != 0) && (errno != ENOENT)) {
 898                 syslog(LOG_WARNING, "webcit: can't unlink %s: %s\n",
 899                         sockpath, strerror(errno));
 900                 return (-WC_EXIT_BIND);
 901         }
 902
 903         memset(&addr, 0, sizeof(addr));
 904         addr.sun_family = AF_UNIX;
 905         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 906
 907         s = socket(AF_UNIX, SOCK_STREAM, 0);
 908         if (s < 0) {
 909                 syslog(LOG_WARNING, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 910                 return (-WC_EXIT_BIND);
 911         }
 912
 913         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 914                 syslog(LOG_WARNING, "webcit: Can't bind: %s\n", strerror(errno));
 915                 close(s);
 916                 return (-WC_EXIT_BIND);
 917         }
 918
 919         if (listen(s, actual_queue_len) < 0) {
 920                 syslog(LOG_WARNING, "webcit: Can't listen: %s\n", strerror(errno));
 921                 close(s);
 922                 return (-WC_EXIT_BIND);
 923         }
 924
 925         chmod(sockpath, 0777);
 926         return(s);
 927 }
 928
 929
 930
 931
 932 /*
 933  * Read data from the client socket.
 934  *
 935  * sock         socket fd to read from
 936  * buf          buffer to read into
 937  * bytes        number of bytes to read
 938  * timeout      Number of seconds to wait before timing out
 939  *
 940  * Possible return values:
 941  *      1       Requested number of bytes has been read.
 942  *      0       Request timed out.
 943  *      -1      Connection is broken, or other error.
 944  */
 945 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 946 {
 947         const char *Error;
 948         int retval = 0;
 949
 950 #ifdef HAVE_OPENSSL
 951         if (is_https) {
 952                 long bufremain = 0;
 953                 long baselen;
 954
 955                 baselen = StrLength(Target);
 956
 957                 if (Hdr->Pos == NULL)
 958                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 959
 960                 if (StrLength(Hdr->ReadBuf) > 0)
 961                 {
 962                         bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 963
 964                         if (bytes < bufremain)
 965                                 bufremain = bytes;
 966                         StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 967                         StrBufCutLeft(Hdr->ReadBuf, bufremain);
 968                 }
 969
 970                 if (bytes > bufremain)
 971                 {
 972                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 973                                (retval >= 0))
 974                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 975                         if (retval >= 0) {
 976                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 977                                 return 1;
 978                         }
 979                         else {
 980                                 syslog(LOG_INFO, "client_read_ssl() failed\n");
 981                                 return -1;
 982                         }
 983                 }
 984                 else
 985                         return 1;
 986         }
 987 #endif
 988
 989         retval = StrBufReadBLOBBuffered(Target,
 990                                         Hdr->ReadBuf,
 991                                         &Hdr->Pos,
 992                                         &Hdr->http_sock,
 993                                         1,
 994                                         bytes,
 995                                         O_TERM,
 996                                         &Error);
 997         if (retval < 0) {
 998                 syslog(LOG_INFO, "client_read() failed: %s\n",
 999                         Error);
1000                 wc_backtrace(LOG_DEBUG);
1001                 return retval;
1002         }
1003
1004         return 1;
1005 }
1006
1007
1008 /*
1009  * Begin buffering HTTP output so we can transmit it all in one write operation later.
1010  */
1011 void begin_burst(void)
1012 {
1013         if (WC->WBuf == NULL) {
1014                 WC->WBuf = NewStrBufPlain(NULL, 32768);
1015         }
1016 }
1017
1018
1019 /*
1020  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
1021  */
1022 long end_burst(void)
1023 {
1024         wcsession *WCC = WC;
1025         const char *ptr, *eptr;
1026         long count;
1027         ssize_t res = 0;
1028         fd_set wset;
1029         int fdflags;
1030
1031         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
1032         {
1033                 if (CompressBuffer(WCC->WBuf) > 0)
1034                         hprintf("Content-encoding: gzip\r\n");
1035                 else {
1036                         syslog(LOG_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
1037                         wc_backtrace(LOG_INFO);
1038                 }
1039         }
1040
1041         if (WCC->WFBuf != NULL) {
1042                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
1043                 FreeStrBuf(&WCC->WFBuf);
1044         }
1045
1046         if (WCC->Hdr->HR.prohibit_caching)
1047                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
1048         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
1049
1050         ptr = ChrPtr(WCC->HBuf);
1051         count = StrLength(WCC->HBuf);
1052         eptr = ptr + count;
1053
1054 #ifdef HAVE_OPENSSL
1055         if (is_https) {
1056                 client_write_ssl(WCC->HBuf);
1057                 client_write_ssl(WCC->WBuf);
1058                 return (count);
1059         }
1060 #endif
1061
1062         if (WCC->Hdr->http_sock == -1)
1063                 return -1;
1064         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
1065
1066         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
1067                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
1068                         FD_ZERO(&wset);
1069                         FD_SET(WCC->Hdr->http_sock, &wset);
1070                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
1071                                 syslog(LOG_DEBUG, "client_write: Socket select failed (%s)\n", strerror(errno));
1072                                 return -1;
1073                         }
1074                 }
1075
1076                 if ((WCC->Hdr->http_sock == -1) ||
1077                     (res = write(WCC->Hdr->http_sock,
1078                                  ptr,
1079                                  count)) == -1) {
1080                         syslog(LOG_DEBUG, "client_write: Socket write failed (%s)\n", strerror(errno));
1081                         wc_backtrace(LOG_INFO);
1082                         return res;
1083                 }
1084                 count -= res;
1085                 ptr += res;
1086         }
1087
1088         ptr = ChrPtr(WCC->WBuf);
1089         count = StrLength(WCC->WBuf);
1090         eptr = ptr + count;
1091
1092         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
1093                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
1094                         FD_ZERO(&wset);
1095                         FD_SET(WCC->Hdr->http_sock, &wset);
1096                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
1097                                 syslog(LOG_INFO, "client_write: Socket select failed (%s)\n", strerror(errno));
1098                                 return -1;
1099                         }
1100                 }
1101
1102                 if ((WCC->Hdr->http_sock == -1) ||
1103                     (res = write(WCC->Hdr->http_sock,
1104                                  ptr,
1105                                  count)) == -1) {
1106                         syslog(LOG_INFO, "client_write: Socket write failed (%s)\n", strerror(errno));
1107                         wc_backtrace(LOG_INFO);
1108                         return res;
1109                 }
1110                 count -= res;
1111                 ptr += res;
1112         }
1113
1114         return StrLength(WCC->WBuf);
1115 }
1116
1117
1118 /*
1119  * lingering_close() a`la Apache. see
1120  * http://httpd.apache.org/docs/2.0/misc/fin_wait_2.html for rationale
1121  */
1122 int lingering_close(int fd)
1123 {
1124         char buf[SIZ];
1125         int i;
1126         fd_set set;
1127         struct timeval tv, start;
1128
1129         gettimeofday(&start, NULL);
1130         if (fd == -1)
1131                 return -1;
1132         shutdown(fd, 1);
1133         do {
1134                 do {
1135                         gettimeofday(&tv, NULL);
1136                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
1137                         tv.tv_usec = start.tv_usec - tv.tv_usec;
1138                         if (tv.tv_usec < 0) {
1139                                 tv.tv_sec--;
1140                                 tv.tv_usec += 1000000;
1141                         }
1142                         FD_ZERO(&set);
1143                         FD_SET(fd, &set);
1144                         i = select(fd + 1, &set, NULL, NULL, &tv);
1145                 } while (i == -1 && errno == EINTR);
1146
1147                 if (i <= 0)
1148                         break;
1149
1150                 i = read(fd, buf, sizeof buf);
1151         } while (i != 0 && (i != -1 || errno == EINTR));
1152
1153         return close(fd);
1154 }
1155
1156 void
1157 HttpNewModule_TCPSOCKETS
1158 (ParsedHttpHdrs *httpreq)
1159 {
1160
1161         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
1162 }
1163
1164 void
1165 HttpDetachModule_TCPSOCKETS
1166 (ParsedHttpHdrs *httpreq)
1167 {
1168
1169         FlushStrBuf(httpreq->ReadBuf);
1170         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
1171 }
1172
1173 void
1174 HttpDestroyModule_TCPSOCKETS
1175 (ParsedHttpHdrs *httpreq)
1176 {
1177
1178         FreeStrBuf(&httpreq->ReadBuf);
1179 }
1180
1181
1182 void
1183 SessionNewModule_TCPSOCKETS
1184 (wcsession *sess)
1185 {
1186         sess->CLineBuf = NewStrBuf();
1187         sess->MigrateReadLineBuf = NewStrBuf();
1188 }
1189
1190 void
1191 SessionDestroyModule_TCPSOCKETS
1192 (wcsession *sess)
1193 {
1194         FreeStrBuf(&sess->CLineBuf);
1195         FreeStrBuf(&sess->ReadBuf);
1196         sess->connected = 0;
1197         sess->ReadPos = NULL;
1198         FreeStrBuf(&sess->MigrateReadLineBuf);
1199         if (sess->serv_sock > 0) {
1200                 syslog(LOG_DEBUG, "Closing socket %d", sess->serv_sock);
1201                 close(sess->serv_sock);
1202         }
1203         sess->serv_sock = -1;
1204 }