webcit/tcp_sockets.c

   1 /*
   2  * Copyright (c) 1987-2017 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_ERR,
 297                                 "ERROR: somebody didn't eat his soup! Remaing Chars: %ld [%s]\n",
 298                                 (long)(pche - WCC->ReadPos),
 299                                 pche
 300                         );
 301                         syslog(LOG_ERR,
 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         const char *Err = NULL;
 560         StrBuf *BufHeader = NULL;
 561         StrBuf *Buf;
 562         StrBuf *pBuf = NULL;
 563         vStreamT *SC = NULL;
 564         IOBuffer ReadBuffer;
 565         IOBuffer WriteBuffer;
 566
 567
 568         Buf = NewStrBuf();
 569
 570         if (WCC->Hdr->HaveRange)
 571         {
 572                 WCC->Hdr->HaveRange++;
 573                 WCC->Hdr->TotalBytes = total_len;
 574                 /* open range? or beyound file border? correct the numbers. */
 575                 if ((WCC->Hdr->RangeTil == -1) || (WCC->Hdr->RangeTil>= total_len))
 576                         WCC->Hdr->RangeTil = total_len - 1;
 577                 bytes_read = WCC->Hdr->RangeStart;
 578                 total_len = WCC->Hdr->RangeTil;
 579         }
 580         else
 581                 chunked = total_len > SIZ * 10; /* TODO: disallow for HTTP / 1.0 */
 582
 583         if (chunked)
 584         {
 585                 BufHeader = NewStrBuf();
 586         }
 587
 588         if ((detect_mime != 0) && (bytes_read != 0))
 589         {
 590                 /* need to read first chunk to detect mime, though the client doesn't care */
 591                 size_t bytes_read = 0;
 592                 const char *CT;
 593
 594                 ServerRc = read_serv_chunk(
 595                         Buf,
 596                         total_len,
 597                         &bytes_read);
 598
 599                 if (ServerRc != 6)
 600                 {
 601                         FreeStrBuf(&BufHeader);
 602                         FreeStrBuf(&Buf);
 603                         return;
 604                 }
 605                 CT = GuessMimeType(SKEY(WCC->WBuf));
 606                 FlushStrBuf(WCC->WBuf);
 607                 StrBufPlain(MimeType, CT, -1);
 608                 CheckGZipCompressionAllowed(SKEY(MimeType));
 609                 detect_mime = 0;
 610                 FreeStrBuf(&Buf);
 611         }
 612
 613         memset(&WriteBuffer, 0, sizeof(IOBuffer));
 614         if (chunked && !DisableGzip && WCC->Hdr->HR.gzip_ok)
 615         {
 616                 is_gzip = 1;
 617                 SC = StrBufNewStreamContext (eZLibEncode, &Err);
 618                 if (SC == NULL) {
 619                         syslog(LOG_ERR, "Error while initializing stream context: %s", Err);
 620                         FreeStrBuf(&Buf);
 621                         return;
 622                 }
 623
 624                 memset(&ReadBuffer, 0, sizeof(IOBuffer));
 625                 ReadBuffer.Buf = WCC->WBuf;
 626
 627                 WriteBuffer.Buf = NewStrBufPlain(NULL, SIZ*2);;
 628                 pBuf = WriteBuffer.Buf;
 629         }
 630         else
 631         {
 632                 pBuf = WCC->WBuf;
 633         }
 634
 635         if (!detect_mime)
 636         {
 637                 http_transmit_headers(ChrPtr(MimeType), is_static, chunked, is_gzip);
 638
 639                 if (send_http(WCC->HBuf) < 0)
 640                 {
 641                         FreeStrBuf(&Buf);
 642                         FreeStrBuf(&WriteBuffer.Buf);
 643                         FreeStrBuf(&BufHeader);
 644                         if (StrBufDestroyStreamContext(eZLibEncode, &SC, &Err) && Err) {
 645                                 syslog(LOG_ERR, "Error while destroying stream context: %s", Err);
 646                         }
 647                         return;
 648                 }
 649         }
 650
 651         while ((bytes_read < total_len) &&
 652                (ServerRc == 6) &&
 653                (client_con_state == 0))
 654         {
 655
 656                 if (WCC->serv_sock==-1) {
 657                         FlushStrBuf(WCC->WBuf);
 658                         FreeStrBuf(&Buf);
 659                         FreeStrBuf(&WriteBuffer.Buf);
 660                         FreeStrBuf(&BufHeader);
 661                         StrBufDestroyStreamContext(eZLibEncode, &SC, &Err);
 662                         if (StrBufDestroyStreamContext(eZLibEncode, &SC, &Err) && Err) {
 663                                 syslog(LOG_ERR, "Error while destroying stream context: %s", Err);
 664                         }
 665                         return;
 666                 }
 667
 668                 ServerRc = read_serv_chunk(
 669                         Buf,
 670                         total_len,
 671                         &bytes_read);
 672                 if (ServerRc != 6)
 673                         break;
 674
 675                 if (detect_mime)
 676                 {
 677                         const char *CT;
 678                         detect_mime = 0;
 679
 680                         CT = GuessMimeType(SKEY(WCC->WBuf));
 681                         StrBufPlain(MimeType, CT, -1);
 682                         if (is_gzip) {
 683                                 CheckGZipCompressionAllowed(SKEY(MimeType));
 684                                 is_gzip = WCC->Hdr->HR.gzip_ok;
 685                         }
 686                         http_transmit_headers(ChrPtr(MimeType), is_static, chunked, is_gzip);
 687
 688                         client_con_state = send_http(WCC->HBuf);
 689                 }
 690
 691                 if (is_gzip)
 692                 {
 693                         int done = (bytes_read == total_len);
 694                         while ((IOBufferStrLength(&ReadBuffer) > 0) && (client_con_state == 0)) {
 695                                 int rc;
 696
 697                                 do {
 698                                         rc = StrBufStreamTranscode(eZLibEncode, &WriteBuffer, &ReadBuffer, NULL, -1, SC, done, &Err);
 699
 700                                         if (StrLength (pBuf) > 0) {
 701                                                 StrBufPrintf(BufHeader, "%s%x\r\n",
 702                                                      (first)?"":"\r\n",
 703                                                              StrLength (pBuf));
 704                                                 first = 0;
 705                                                 client_con_state = send_http(BufHeader);
 706                                                 if (client_con_state == 0) {
 707                                                         client_con_state = send_http(pBuf);
 708                                                 }
 709                                                 FlushStrBuf(pBuf);
 710                                         }
 711                                 } while ((rc == 1) && (StrLength(pBuf) > 0));
 712                         }
 713                         FlushStrBuf(WCC->WBuf);
 714                 }
 715                 else {
 716                         if ((chunked) && (client_con_state == 0))
 717                         {
 718                                 StrBufPrintf(BufHeader, "%s%x\r\n",
 719                                              (first)?"":"\r\n",
 720                                              StrLength (pBuf));
 721                                 first = 0;
 722                                 client_con_state = send_http(BufHeader);
 723                         }
 724
 725                         if (client_con_state == 0)
 726                                 client_con_state = send_http(pBuf);
 727
 728                         FlushStrBuf(pBuf);
 729                 }
 730         }
 731
 732         if (SC && StrBufDestroyStreamContext(eZLibEncode, &SC, &Err) && Err) {
 733                 syslog(LOG_ERR, "Error while destroying stream context: %s", Err);
 734         }
 735         FreeStrBuf(&WriteBuffer.Buf);
 736         if ((chunked) && (client_con_state == 0))
 737         {
 738                 StrBufPlain(BufHeader, HKEY("\r\n0\r\n\r\n"));
 739                 if (send_http(BufHeader) < 0)
 740                 {
 741                         FreeStrBuf(&Buf);
 742                         FreeStrBuf(&BufHeader);
 743                         return;
 744                 }
 745         }
 746         FreeStrBuf(&BufHeader);
 747         FreeStrBuf(&Buf);
 748 }
 749
 750 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 751 {
 752         const char *Error;
 753 #ifdef HAVE_OPENSSL
 754         const char *pch, *pchs;
 755         int rlen, len, retval = 0;
 756
 757         if (is_https) {
 758                 int ntries = 0;
 759                 if (StrLength(Hdr->ReadBuf) > 0)
 760                 {
 761                         pchs = ChrPtr(Hdr->ReadBuf);
 762                         pch = strchr(pchs, '\n');
 763                         if (pch != NULL) {
 764                                 rlen = 0;
 765                                 len = pch - pchs;
 766                                 if (len > 0 && (*(pch - 1) == '\r') )
 767                                         rlen ++;
 768                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 769                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 770                                 return len - rlen;
 771                         }
 772                 }
 773
 774                 while (retval == 0) {
 775                                 pch = NULL;
 776                                 pchs = ChrPtr(Hdr->ReadBuf);
 777                                 if (*pchs != '\0')
 778                                         pch = strchr(pchs, '\n');
 779                                 if (pch == NULL) {
 780                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 781                                         pchs = ChrPtr(Hdr->ReadBuf);
 782                                         pch = strchr(pchs, '\n');
 783                                         if (pch == NULL)
 784                                                 retval = 0;
 785                                 }
 786                                 if (retval == 0) {
 787                                         sleeeeeeeeeep(1);
 788                                         ntries ++;
 789                                 }
 790                                 if (ntries > 10)
 791                                         return 0;
 792                 }
 793                 if ((retval > 0) && (pch != NULL)) {
 794                         rlen = 0;
 795                         len = pch - pchs;
 796                         if (len > 0 && (*(pch - 1) == '\r') )
 797                                 rlen ++;
 798                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 799                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 800                         return len - rlen;
 801
 802                 }
 803                 else
 804                         return -1;
 805         }
 806         else
 807 #endif
 808                 return StrBufTCP_read_buffered_line_fast(Target,
 809                                                          Hdr->ReadBuf,
 810                                                          &Hdr->Pos,
 811                                                          &Hdr->http_sock,
 812                                                          5,
 813                                                          1,
 814                                                          &Error);
 815 }
 816
 817
 818 /*
 819  * This is a generic function to set up a master socket for listening on
 820  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 821  *
 822  * ip_addr      IP address to bind
 823  * port_number  port number to bind
 824  * queue_len    number of incoming connections to allow in the queue
 825  */
 826 int webcit_tcp_server(const char *ip_addr, int port_number, int queue_len)
 827 {
 828         const char *ipv4broadcast = "0.0.0.0";
 829         int IsDefault = 0;
 830         struct protoent *p;
 831         struct sockaddr_in6 sin6;
 832         struct sockaddr_in sin4;
 833         int s, i, b;
 834         int ip_version = 6;
 835
 836 retry:
 837         memset(&sin6, 0, sizeof(sin6));
 838         memset(&sin4, 0, sizeof(sin4));
 839         sin6.sin6_family = AF_INET6;
 840         sin4.sin_family = AF_INET;
 841
 842         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 843                 || (IsEmptyStr(ip_addr))
 844                 || (!strcmp(ip_addr, "*"))
 845         ) {
 846                 IsDefault = 1;
 847                 ip_version = 6;
 848                 sin6.sin6_addr = in6addr_any;
 849         }
 850         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 851         {
 852                 ip_version = 4;
 853                 sin4.sin_addr.s_addr = INADDR_ANY;
 854         }
 855         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 856         {
 857                 ip_version = 4;
 858                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 859                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 860                         return (-WC_EXIT_BIND);
 861                 }
 862         }
 863         else                                                                            /* specific IPv6 */
 864         {
 865                 ip_version = 6;
 866                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 867                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 868                         return (-WC_EXIT_BIND);
 869                 }
 870         }
 871
 872         if (port_number == 0) {
 873                 syslog(LOG_WARNING, "Cannot start: no port number specified.\n");
 874                 return (-WC_EXIT_BIND);
 875         }
 876         sin6.sin6_port = htons((u_short) port_number);
 877         sin4.sin_port = htons((u_short) port_number);
 878
 879         p = getprotobyname("tcp");
 880
 881         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 882         if (s < 0) {
 883                 if (IsDefault && (errno == EAFNOSUPPORT))
 884                 {
 885                         s = 0;
 886                         ip_addr = ipv4broadcast;
 887                         goto retry;
 888                 }
 889                 syslog(LOG_WARNING, "Can't create a listening socket: %s\n", strerror(errno));
 890                 return (-WC_EXIT_BIND);
 891         }
 892         /* Set some socket options that make sense. */
 893         i = 1;
 894         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 895
 896         if (ip_version == 6) {
 897                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 898         }
 899         else {
 900                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 901         }
 902
 903         if (b < 0) {
 904                 syslog(LOG_ERR, "Can't bind: %s\n", strerror(errno));
 905                 close(s);
 906                 return (-WC_EXIT_BIND);
 907         }
 908
 909         if (listen(s, queue_len) < 0) {
 910                 syslog(LOG_ERR, "Can't listen: %s\n", strerror(errno));
 911                 close(s);
 912                 return (-WC_EXIT_BIND);
 913         }
 914         return (s);
 915 }
 916
 917
 918 /*
 919  * Create a Unix domain socket and listen on it
 920  * sockpath - file name of the unix domain socket
 921  * queue_len - Number of incoming connections to allow in the queue
 922  */
 923 int webcit_uds_server(char *sockpath, int queue_len)
 924 {
 925         struct sockaddr_un addr;
 926         int s;
 927         int i;
 928         int actual_queue_len;
 929
 930         actual_queue_len = queue_len;
 931         if (actual_queue_len < 5) actual_queue_len = 5;
 932
 933         i = unlink(sockpath);
 934         if ((i != 0) && (errno != ENOENT)) {
 935                 syslog(LOG_WARNING, "webcit: can't unlink %s: %s\n",
 936                         sockpath, strerror(errno));
 937                 return (-WC_EXIT_BIND);
 938         }
 939
 940         memset(&addr, 0, sizeof(addr));
 941         addr.sun_family = AF_UNIX;
 942         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 943
 944         s = socket(AF_UNIX, SOCK_STREAM, 0);
 945         if (s < 0) {
 946                 syslog(LOG_WARNING, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 947                 return (-WC_EXIT_BIND);
 948         }
 949
 950         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 951                 syslog(LOG_WARNING, "webcit: Can't bind: %s\n", strerror(errno));
 952                 close(s);
 953                 return (-WC_EXIT_BIND);
 954         }
 955
 956         if (listen(s, actual_queue_len) < 0) {
 957                 syslog(LOG_WARNING, "webcit: Can't listen: %s\n", strerror(errno));
 958                 close(s);
 959                 return (-WC_EXIT_BIND);
 960         }
 961
 962         chmod(sockpath, 0777);
 963         return(s);
 964 }
 965
 966
 967
 968
 969 /*
 970  * Read data from the client socket.
 971  *
 972  * sock         socket fd to read from
 973  * buf          buffer to read into
 974  * bytes        number of bytes to read
 975  * timeout      Number of seconds to wait before timing out
 976  *
 977  * Possible return values:
 978  *      1       Requested number of bytes has been read.
 979  *      0       Request timed out.
 980  *      -1      Connection is broken, or other error.
 981  */
 982 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 983 {
 984         const char *Error;
 985         int retval = 0;
 986
 987 #ifdef HAVE_OPENSSL
 988         if (is_https) {
 989                 long bufremain = 0;
 990                 long baselen;
 991
 992                 baselen = StrLength(Target);
 993
 994                 if (Hdr->Pos == NULL)
 995                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 996
 997                 if (StrLength(Hdr->ReadBuf) > 0)
 998                 {
 999                         bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
1000
1001                         if (bytes < bufremain)
1002                                 bufremain = bytes;
1003                         StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
1004                         StrBufCutLeft(Hdr->ReadBuf, bufremain);
1005                 }
1006
1007                 if (bytes > bufremain)
1008                 {
1009                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
1010                                (retval >= 0))
1011                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
1012                         if (retval >= 0) {
1013                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
1014                                 return 1;
1015                         }
1016                         else {
1017                                 syslog(LOG_INFO, "client_read_ssl() failed\n");
1018                                 return -1;
1019                         }
1020                 }
1021                 else
1022                         return 1;
1023         }
1024 #endif
1025
1026         retval = StrBufReadBLOBBuffered(Target,
1027                                         Hdr->ReadBuf,
1028                                         &Hdr->Pos,
1029                                         &Hdr->http_sock,
1030                                         1,
1031                                         bytes,
1032                                         O_TERM,
1033                                         &Error);
1034         if (retval < 0) {
1035                 syslog(LOG_INFO, "client_read() failed: %s\n",
1036                         Error);
1037                 wc_backtrace(LOG_DEBUG);
1038                 return retval;
1039         }
1040
1041         return 1;
1042 }
1043
1044
1045 /*
1046  * Begin buffering HTTP output so we can transmit it all in one write operation later.
1047  */
1048 void begin_burst(void)
1049 {
1050         if (WC->WBuf == NULL) {
1051                 WC->WBuf = NewStrBufPlain(NULL, 32768);
1052         }
1053 }
1054
1055
1056 /*
1057  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
1058  */
1059 long end_burst(void)
1060 {
1061         wcsession *WCC = WC;
1062         const char *ptr, *eptr;
1063         long count;
1064         ssize_t res = 0;
1065         fd_set wset;
1066         int fdflags;
1067
1068         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
1069         {
1070                 if (CompressBuffer(WCC->WBuf) > 0)
1071                         hprintf("Content-encoding: gzip\r\n");
1072                 else {
1073                         syslog(LOG_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
1074                         wc_backtrace(LOG_INFO);
1075                 }
1076         }
1077
1078         if (WCC->WFBuf != NULL) {
1079                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
1080                 FreeStrBuf(&WCC->WFBuf);
1081         }
1082
1083         if (WCC->Hdr->HR.prohibit_caching)
1084                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
1085         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
1086
1087         ptr = ChrPtr(WCC->HBuf);
1088         count = StrLength(WCC->HBuf);
1089         eptr = ptr + count;
1090
1091 #ifdef HAVE_OPENSSL
1092         if (is_https) {
1093                 client_write_ssl(WCC->HBuf);
1094                 client_write_ssl(WCC->WBuf);
1095                 return (count);
1096         }
1097 #endif
1098
1099         if (WCC->Hdr->http_sock == -1)
1100                 return -1;
1101         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
1102
1103         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
1104                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
1105                         FD_ZERO(&wset);
1106                         FD_SET(WCC->Hdr->http_sock, &wset);
1107                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
1108                                 syslog(LOG_DEBUG, "client_write: Socket select failed (%s)\n", strerror(errno));
1109                                 return -1;
1110                         }
1111                 }
1112
1113                 if ((WCC->Hdr->http_sock == -1) ||
1114                     (res = write(WCC->Hdr->http_sock,
1115                                  ptr,
1116                                  count)) == -1) {
1117                         syslog(LOG_DEBUG, "client_write: Socket write failed (%s)\n", strerror(errno));
1118                         wc_backtrace(LOG_INFO);
1119                         return res;
1120                 }
1121                 count -= res;
1122                 ptr += res;
1123         }
1124
1125         ptr = ChrPtr(WCC->WBuf);
1126         count = StrLength(WCC->WBuf);
1127         eptr = ptr + count;
1128
1129         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
1130                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
1131                         FD_ZERO(&wset);
1132                         FD_SET(WCC->Hdr->http_sock, &wset);
1133                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
1134                                 syslog(LOG_INFO, "client_write: Socket select failed (%s)\n", strerror(errno));
1135                                 return -1;
1136                         }
1137                 }
1138
1139                 if ((WCC->Hdr->http_sock == -1) ||
1140                     (res = write(WCC->Hdr->http_sock,
1141                                  ptr,
1142                                  count)) == -1) {
1143                         syslog(LOG_INFO, "client_write: Socket write failed (%s)\n", strerror(errno));
1144                         wc_backtrace(LOG_INFO);
1145                         return res;
1146                 }
1147                 count -= res;
1148                 ptr += res;
1149         }
1150
1151         return StrLength(WCC->WBuf);
1152 }
1153
1154
1155 /*
1156  * lingering_close() a`la Apache. see
1157  * http://httpd.apache.org/docs/2.0/misc/fin_wait_2.html for rationale
1158  */
1159 int lingering_close(int fd)
1160 {
1161         char buf[SIZ];
1162         int i;
1163         fd_set set;
1164         struct timeval tv, start;
1165
1166         gettimeofday(&start, NULL);
1167         if (fd == -1)
1168                 return -1;
1169         shutdown(fd, 1);
1170         do {
1171                 do {
1172                         gettimeofday(&tv, NULL);
1173                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
1174                         tv.tv_usec = start.tv_usec - tv.tv_usec;
1175                         if (tv.tv_usec < 0) {
1176                                 tv.tv_sec--;
1177                                 tv.tv_usec += 1000000;
1178                         }
1179                         FD_ZERO(&set);
1180                         FD_SET(fd, &set);
1181                         i = select(fd + 1, &set, NULL, NULL, &tv);
1182                 } while (i == -1 && errno == EINTR);
1183
1184                 if (i <= 0)
1185                         break;
1186
1187                 i = read(fd, buf, sizeof buf);
1188         } while (i != 0 && (i != -1 || errno == EINTR));
1189
1190         return close(fd);
1191 }
1192
1193 void
1194 HttpNewModule_TCPSOCKETS
1195 (ParsedHttpHdrs *httpreq)
1196 {
1197
1198         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
1199 }
1200
1201 void
1202 HttpDetachModule_TCPSOCKETS
1203 (ParsedHttpHdrs *httpreq)
1204 {
1205
1206         FlushStrBuf(httpreq->ReadBuf);
1207         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
1208 }
1209
1210 void
1211 HttpDestroyModule_TCPSOCKETS
1212 (ParsedHttpHdrs *httpreq)
1213 {
1214
1215         FreeStrBuf(&httpreq->ReadBuf);
1216 }
1217
1218
1219 void
1220 SessionNewModule_TCPSOCKETS
1221 (wcsession *sess)
1222 {
1223         sess->CLineBuf = NewStrBuf();
1224         sess->MigrateReadLineBuf = NewStrBuf();
1225 }
1226
1227 void
1228 SessionDestroyModule_TCPSOCKETS
1229 (wcsession *sess)
1230 {
1231         FreeStrBuf(&sess->CLineBuf);
1232         FreeStrBuf(&sess->ReadBuf);
1233         sess->connected = 0;
1234         sess->ReadPos = NULL;
1235         FreeStrBuf(&sess->MigrateReadLineBuf);
1236         if (sess->serv_sock > 0) {
1237                 syslog(LOG_DEBUG, "Closing socket %d", sess->serv_sock);
1238                 close(sess->serv_sock);
1239         }
1240         sess->serv_sock = -1;
1241 }