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(&BufHeader);
 601                         FreeStrBuf(&Buf);
 602                         return;
 603                 }
 604                 CT = GuessMimeType(SKEY(WCC->WBuf));
 605                 FlushStrBuf(WCC->WBuf);
 606                 StrBufPlain(MimeType, CT, -1);
 607                 CheckGZipCompressionAllowed(SKEY(MimeType));
 608                 detect_mime = 0;
 609                 FreeStrBuf(&Buf);
 610         }
 611
 612         memset(&WriteBuffer, 0, sizeof(IOBuffer));
 613         if (chunked && !DisableGzip && WCC->Hdr->HR.gzip_ok)
 614         {
 615                 is_gzip = 1;
 616                 SC = StrBufNewStreamContext (eZLibEncode);
 617
 618                 memset(&ReadBuffer, 0, sizeof(IOBuffer));
 619                 ReadBuffer.Buf = WCC->WBuf;
 620
 621                 WriteBuffer.Buf = NewStrBufPlain(NULL, SIZ*2);;
 622                 pBuf = WriteBuffer.Buf;
 623         }
 624         else
 625         {
 626                 pBuf = WCC->WBuf;
 627         }
 628
 629         if (!detect_mime)
 630         {
 631                 http_transmit_headers(ChrPtr(MimeType), is_static, chunked, is_gzip);
 632
 633                 if (send_http(WCC->HBuf) < 0)
 634                 {
 635                         FreeStrBuf(&Buf);
 636                         FreeStrBuf(&WriteBuffer.Buf);
 637                         FreeStrBuf(&BufHeader);
 638                         StrBufDestroyStreamContext(eZLibEncode, SC);
 639                         return;
 640                 }
 641         }
 642
 643         while ((bytes_read < total_len) &&
 644                (ServerRc == 6) &&
 645                (client_con_state == 0))
 646         {
 647
 648                 if (WCC->serv_sock==-1) {
 649                         FlushStrBuf(WCC->WBuf);
 650                         FreeStrBuf(&Buf);
 651                         FreeStrBuf(&WriteBuffer.Buf);
 652                         FreeStrBuf(&BufHeader);
 653                         StrBufDestroyStreamContext(eZLibEncode, SC);
 654                         return;
 655                 }
 656
 657                 ServerRc = read_serv_chunk(
 658                         Buf,
 659                         total_len,
 660                         &bytes_read);
 661                 if (ServerRc != 6)
 662                         break;
 663
 664                 if (detect_mime)
 665                 {
 666                         const char *CT;
 667                         detect_mime = 0;
 668
 669                         CT = GuessMimeType(SKEY(WCC->WBuf));
 670                         StrBufPlain(MimeType, CT, -1);
 671                         if (is_gzip) {
 672                                 CheckGZipCompressionAllowed(SKEY(MimeType));
 673                                 is_gzip = WCC->Hdr->HR.gzip_ok;
 674                         }
 675                         http_transmit_headers(ChrPtr(MimeType), is_static, chunked, is_gzip);
 676
 677                         client_con_state = send_http(WCC->HBuf);
 678                 }
 679
 680                 if (is_gzip)
 681                 {
 682                         int done = (bytes_read == total_len);
 683                         while ((IOBufferStrLength(&ReadBuffer) > 0) && (client_con_state == 0)) {
 684                                 int rc;
 685
 686                                 do {
 687                                         rc = StrBufStreamTranscode(eZLibEncode, &WriteBuffer, &ReadBuffer, NULL, -1, SC, done);
 688
 689                                         if (StrLength (pBuf) > 0) {
 690                                                 StrBufPrintf(BufHeader, "%s%x\r\n",
 691                                                      (first)?"":"\r\n",
 692                                                              StrLength (pBuf));
 693                                                 first = 0;
 694                                                 client_con_state = send_http(BufHeader);
 695                                                 if (client_con_state == 0) {
 696                                                         client_con_state = send_http(pBuf);
 697                                                 }
 698                                                 FlushStrBuf(pBuf);
 699                                         }
 700                                 } while (rc == 1);
 701                         }
 702                         FlushStrBuf(WCC->WBuf);
 703                 }
 704                 else {
 705                         if ((chunked) && (client_con_state == 0))
 706                         {
 707                                 StrBufPrintf(BufHeader, "%s%x\r\n",
 708                                              (first)?"":"\r\n",
 709                                              StrLength (pBuf));
 710                                 first = 0;
 711                                 client_con_state = send_http(BufHeader);
 712                         }
 713
 714                         if (client_con_state == 0)
 715                                 client_con_state = send_http(pBuf);
 716
 717                         FlushStrBuf(pBuf);
 718                 }
 719         }
 720
 721         StrBufDestroyStreamContext(eZLibEncode, SC);
 722         FreeStrBuf(&WriteBuffer.Buf);
 723         if ((chunked) && (client_con_state == 0))
 724         {
 725                 StrBufPlain(BufHeader, HKEY("\r\n0\r\n\r\n"));
 726                 if (send_http(BufHeader) < 0)
 727                 {
 728                         FreeStrBuf(&Buf);
 729                         FreeStrBuf(&BufHeader);
 730                         return;
 731                 }
 732         }
 733         FreeStrBuf(&BufHeader);
 734         FreeStrBuf(&Buf);
 735 }
 736
 737 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 738 {
 739         const char *Error;
 740 #ifdef HAVE_OPENSSL
 741         const char *pch, *pchs;
 742         int rlen, len, retval = 0;
 743
 744         if (is_https) {
 745                 int ntries = 0;
 746                 if (StrLength(Hdr->ReadBuf) > 0)
 747                 {
 748                         pchs = ChrPtr(Hdr->ReadBuf);
 749                         pch = strchr(pchs, '\n');
 750                         if (pch != NULL) {
 751                                 rlen = 0;
 752                                 len = pch - pchs;
 753                                 if (len > 0 && (*(pch - 1) == '\r') )
 754                                         rlen ++;
 755                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 756                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 757                                 return len - rlen;
 758                         }
 759                 }
 760
 761                 while (retval == 0) {
 762                                 pch = NULL;
 763                                 pchs = ChrPtr(Hdr->ReadBuf);
 764                                 if (*pchs != '\0')
 765                                         pch = strchr(pchs, '\n');
 766                                 if (pch == NULL) {
 767                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 768                                         pchs = ChrPtr(Hdr->ReadBuf);
 769                                         pch = strchr(pchs, '\n');
 770                                         if (pch == NULL)
 771                                                 retval = 0;
 772                                 }
 773                                 if (retval == 0) {
 774                                         sleeeeeeeeeep(1);
 775                                         ntries ++;
 776                                 }
 777                                 if (ntries > 10)
 778                                         return 0;
 779                 }
 780                 if ((retval > 0) && (pch != NULL)) {
 781                         rlen = 0;
 782                         len = pch - pchs;
 783                         if (len > 0 && (*(pch - 1) == '\r') )
 784                                 rlen ++;
 785                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 786                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 787                         return len - rlen;
 788
 789                 }
 790                 else
 791                         return -1;
 792         }
 793         else
 794 #endif
 795                 return StrBufTCP_read_buffered_line_fast(Target,
 796                                                          Hdr->ReadBuf,
 797                                                          &Hdr->Pos,
 798                                                          &Hdr->http_sock,
 799                                                          5,
 800                                                          1,
 801                                                          &Error);
 802 }
 803
 804
 805 /*
 806  * This is a generic function to set up a master socket for listening on
 807  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 808  *
 809  * ip_addr      IP address to bind
 810  * port_number  port number to bind
 811  * queue_len    number of incoming connections to allow in the queue
 812  */
 813 int webcit_tcp_server(const char *ip_addr, int port_number, int queue_len)
 814 {
 815         const char *ipv4broadcast = "0.0.0.0";
 816         int IsDefault = 0;
 817         struct protoent *p;
 818         struct sockaddr_in6 sin6;
 819         struct sockaddr_in sin4;
 820         int s, i, b;
 821         int ip_version = 6;
 822
 823 retry:
 824         memset(&sin6, 0, sizeof(sin6));
 825         memset(&sin4, 0, sizeof(sin4));
 826         sin6.sin6_family = AF_INET6;
 827         sin4.sin_family = AF_INET;
 828
 829         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 830                 || (IsEmptyStr(ip_addr))
 831                 || (!strcmp(ip_addr, "*"))
 832         ) {
 833                 IsDefault = 1;
 834                 ip_version = 6;
 835                 sin6.sin6_addr = in6addr_any;
 836         }
 837         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 838         {
 839                 ip_version = 4;
 840                 sin4.sin_addr.s_addr = INADDR_ANY;
 841         }
 842         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 843         {
 844                 ip_version = 4;
 845                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 846                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 847                         return (-WC_EXIT_BIND);
 848                 }
 849         }
 850         else                                                                            /* specific IPv6 */
 851         {
 852                 ip_version = 6;
 853                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 854                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 855                         return (-WC_EXIT_BIND);
 856                 }
 857         }
 858
 859         if (port_number == 0) {
 860                 syslog(LOG_WARNING, "Cannot start: no port number specified.\n");
 861                 return (-WC_EXIT_BIND);
 862         }
 863         sin6.sin6_port = htons((u_short) port_number);
 864         sin4.sin_port = htons((u_short) port_number);
 865
 866         p = getprotobyname("tcp");
 867
 868         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 869         if (s < 0) {
 870                 if (IsDefault && (errno == EAFNOSUPPORT))
 871                 {
 872                         s = 0;
 873                         ip_addr = ipv4broadcast;
 874                         goto retry;
 875                 }
 876                 syslog(LOG_WARNING, "Can't create a listening socket: %s\n", strerror(errno));
 877                 return (-WC_EXIT_BIND);
 878         }
 879         /* Set some socket options that make sense. */
 880         i = 1;
 881         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 882
 883         if (ip_version == 6) {
 884                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 885         }
 886         else {
 887                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 888         }
 889
 890         if (b < 0) {
 891                 syslog(LOG_EMERG, "Can't bind: %s\n", strerror(errno));
 892                 close(s);
 893                 return (-WC_EXIT_BIND);
 894         }
 895
 896         if (listen(s, queue_len) < 0) {
 897                 syslog(LOG_EMERG, "Can't listen: %s\n", strerror(errno));
 898                 close(s);
 899                 return (-WC_EXIT_BIND);
 900         }
 901         return (s);
 902 }
 903
 904
 905 /*
 906  * Create a Unix domain socket and listen on it
 907  * sockpath - file name of the unix domain socket
 908  * queue_len - Number of incoming connections to allow in the queue
 909  */
 910 int webcit_uds_server(char *sockpath, int queue_len)
 911 {
 912         struct sockaddr_un addr;
 913         int s;
 914         int i;
 915         int actual_queue_len;
 916
 917         actual_queue_len = queue_len;
 918         if (actual_queue_len < 5) actual_queue_len = 5;
 919
 920         i = unlink(sockpath);
 921         if ((i != 0) && (errno != ENOENT)) {
 922                 syslog(LOG_WARNING, "webcit: can't unlink %s: %s\n",
 923                         sockpath, strerror(errno));
 924                 return (-WC_EXIT_BIND);
 925         }
 926
 927         memset(&addr, 0, sizeof(addr));
 928         addr.sun_family = AF_UNIX;
 929         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 930
 931         s = socket(AF_UNIX, SOCK_STREAM, 0);
 932         if (s < 0) {
 933                 syslog(LOG_WARNING, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 934                 return (-WC_EXIT_BIND);
 935         }
 936
 937         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 938                 syslog(LOG_WARNING, "webcit: Can't bind: %s\n", strerror(errno));
 939                 close(s);
 940                 return (-WC_EXIT_BIND);
 941         }
 942
 943         if (listen(s, actual_queue_len) < 0) {
 944                 syslog(LOG_WARNING, "webcit: Can't listen: %s\n", strerror(errno));
 945                 close(s);
 946                 return (-WC_EXIT_BIND);
 947         }
 948
 949         chmod(sockpath, 0777);
 950         return(s);
 951 }
 952
 953
 954
 955
 956 /*
 957  * Read data from the client socket.
 958  *
 959  * sock         socket fd to read from
 960  * buf          buffer to read into
 961  * bytes        number of bytes to read
 962  * timeout      Number of seconds to wait before timing out
 963  *
 964  * Possible return values:
 965  *      1       Requested number of bytes has been read.
 966  *      0       Request timed out.
 967  *      -1      Connection is broken, or other error.
 968  */
 969 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 970 {
 971         const char *Error;
 972         int retval = 0;
 973
 974 #ifdef HAVE_OPENSSL
 975         if (is_https) {
 976                 long bufremain = 0;
 977                 long baselen;
 978
 979                 baselen = StrLength(Target);
 980
 981                 if (Hdr->Pos == NULL)
 982                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 983
 984                 if (StrLength(Hdr->ReadBuf) > 0)
 985                 {
 986                         bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 987
 988                         if (bytes < bufremain)
 989                                 bufremain = bytes;
 990                         StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 991                         StrBufCutLeft(Hdr->ReadBuf, bufremain);
 992                 }
 993
 994                 if (bytes > bufremain)
 995                 {
 996                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 997                                (retval >= 0))
 998                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 999                         if (retval >= 0) {
1000                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
1001                                 return 1;
1002                         }
1003                         else {
1004                                 syslog(LOG_INFO, "client_read_ssl() failed\n");
1005                                 return -1;
1006                         }
1007                 }
1008                 else
1009                         return 1;
1010         }
1011 #endif
1012
1013         retval = StrBufReadBLOBBuffered(Target,
1014                                         Hdr->ReadBuf,
1015                                         &Hdr->Pos,
1016                                         &Hdr->http_sock,
1017                                         1,
1018                                         bytes,
1019                                         O_TERM,
1020                                         &Error);
1021         if (retval < 0) {
1022                 syslog(LOG_INFO, "client_read() failed: %s\n",
1023                         Error);
1024                 wc_backtrace(LOG_DEBUG);
1025                 return retval;
1026         }
1027
1028         return 1;
1029 }
1030
1031
1032 /*
1033  * Begin buffering HTTP output so we can transmit it all in one write operation later.
1034  */
1035 void begin_burst(void)
1036 {
1037         if (WC->WBuf == NULL) {
1038                 WC->WBuf = NewStrBufPlain(NULL, 32768);
1039         }
1040 }
1041
1042
1043 /*
1044  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
1045  */
1046 long end_burst(void)
1047 {
1048         wcsession *WCC = WC;
1049         const char *ptr, *eptr;
1050         long count;
1051         ssize_t res = 0;
1052         fd_set wset;
1053         int fdflags;
1054
1055         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
1056         {
1057                 if (CompressBuffer(WCC->WBuf) > 0)
1058                         hprintf("Content-encoding: gzip\r\n");
1059                 else {
1060                         syslog(LOG_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
1061                         wc_backtrace(LOG_INFO);
1062                 }
1063         }
1064
1065         if (WCC->WFBuf != NULL) {
1066                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
1067                 FreeStrBuf(&WCC->WFBuf);
1068         }
1069
1070         if (WCC->Hdr->HR.prohibit_caching)
1071                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
1072         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
1073
1074         ptr = ChrPtr(WCC->HBuf);
1075         count = StrLength(WCC->HBuf);
1076         eptr = ptr + count;
1077
1078 #ifdef HAVE_OPENSSL
1079         if (is_https) {
1080                 client_write_ssl(WCC->HBuf);
1081                 client_write_ssl(WCC->WBuf);
1082                 return (count);
1083         }
1084 #endif
1085
1086         if (WCC->Hdr->http_sock == -1)
1087                 return -1;
1088         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
1089
1090         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
1091                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
1092                         FD_ZERO(&wset);
1093                         FD_SET(WCC->Hdr->http_sock, &wset);
1094                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
1095                                 syslog(LOG_DEBUG, "client_write: Socket select failed (%s)\n", strerror(errno));
1096                                 return -1;
1097                         }
1098                 }
1099
1100                 if ((WCC->Hdr->http_sock == -1) ||
1101                     (res = write(WCC->Hdr->http_sock,
1102                                  ptr,
1103                                  count)) == -1) {
1104                         syslog(LOG_DEBUG, "client_write: Socket write failed (%s)\n", strerror(errno));
1105                         wc_backtrace(LOG_INFO);
1106                         return res;
1107                 }
1108                 count -= res;
1109                 ptr += res;
1110         }
1111
1112         ptr = ChrPtr(WCC->WBuf);
1113         count = StrLength(WCC->WBuf);
1114         eptr = ptr + count;
1115
1116         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
1117                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
1118                         FD_ZERO(&wset);
1119                         FD_SET(WCC->Hdr->http_sock, &wset);
1120                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
1121                                 syslog(LOG_INFO, "client_write: Socket select failed (%s)\n", strerror(errno));
1122                                 return -1;
1123                         }
1124                 }
1125
1126                 if ((WCC->Hdr->http_sock == -1) ||
1127                     (res = write(WCC->Hdr->http_sock,
1128                                  ptr,
1129                                  count)) == -1) {
1130                         syslog(LOG_INFO, "client_write: Socket write failed (%s)\n", strerror(errno));
1131                         wc_backtrace(LOG_INFO);
1132                         return res;
1133                 }
1134                 count -= res;
1135                 ptr += res;
1136         }
1137
1138         return StrLength(WCC->WBuf);
1139 }
1140
1141
1142 /*
1143  * lingering_close() a`la Apache. see
1144  * http://httpd.apache.org/docs/2.0/misc/fin_wait_2.html for rationale
1145  */
1146 int lingering_close(int fd)
1147 {
1148         char buf[SIZ];
1149         int i;
1150         fd_set set;
1151         struct timeval tv, start;
1152
1153         gettimeofday(&start, NULL);
1154         if (fd == -1)
1155                 return -1;
1156         shutdown(fd, 1);
1157         do {
1158                 do {
1159                         gettimeofday(&tv, NULL);
1160                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
1161                         tv.tv_usec = start.tv_usec - tv.tv_usec;
1162                         if (tv.tv_usec < 0) {
1163                                 tv.tv_sec--;
1164                                 tv.tv_usec += 1000000;
1165                         }
1166                         FD_ZERO(&set);
1167                         FD_SET(fd, &set);
1168                         i = select(fd + 1, &set, NULL, NULL, &tv);
1169                 } while (i == -1 && errno == EINTR);
1170
1171                 if (i <= 0)
1172                         break;
1173
1174                 i = read(fd, buf, sizeof buf);
1175         } while (i != 0 && (i != -1 || errno == EINTR));
1176
1177         return close(fd);
1178 }
1179
1180 void
1181 HttpNewModule_TCPSOCKETS
1182 (ParsedHttpHdrs *httpreq)
1183 {
1184
1185         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
1186 }
1187
1188 void
1189 HttpDetachModule_TCPSOCKETS
1190 (ParsedHttpHdrs *httpreq)
1191 {
1192
1193         FlushStrBuf(httpreq->ReadBuf);
1194         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
1195 }
1196
1197 void
1198 HttpDestroyModule_TCPSOCKETS
1199 (ParsedHttpHdrs *httpreq)
1200 {
1201
1202         FreeStrBuf(&httpreq->ReadBuf);
1203 }
1204
1205
1206 void
1207 SessionNewModule_TCPSOCKETS
1208 (wcsession *sess)
1209 {
1210         sess->CLineBuf = NewStrBuf();
1211         sess->MigrateReadLineBuf = NewStrBuf();
1212 }
1213
1214 void
1215 SessionDestroyModule_TCPSOCKETS
1216 (wcsession *sess)
1217 {
1218         FreeStrBuf(&sess->CLineBuf);
1219         FreeStrBuf(&sess->ReadBuf);
1220         sess->connected = 0;
1221         sess->ReadPos = NULL;
1222         FreeStrBuf(&sess->MigrateReadLineBuf);
1223         if (sess->serv_sock > 0) {
1224                 syslog(LOG_DEBUG, "Closing socket %d", sess->serv_sock);
1225                 close(sess->serv_sock);
1226         }
1227         sess->serv_sock = -1;
1228 }