webcit/tcp_sockets.c

   1 /*
   2  * Copyright (c) 1987-2021 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         int len;
 165
 166         *strbuf = '\0';
 167         StrBuf_ServGetln(WC->MigrateReadLineBuf);
 168         len = StrLength(WC->MigrateReadLineBuf);
 169         if (len > bufsize)
 170                 len = bufsize - 1;
 171         memcpy(strbuf, ChrPtr(WC->MigrateReadLineBuf), len);
 172         FlushStrBuf(WC->MigrateReadLineBuf);
 173         strbuf[len] = '\0';
 174 #ifdef SERV_TRACE
 175         syslog(LOG_DEBUG, "%3d<<<%s\n", WC->serv_sock, strbuf);
 176 #endif
 177         return len;
 178 }
 179
 180
 181 int StrBuf_ServGetln(StrBuf *buf)
 182 {
 183         const char *ErrStr = NULL;
 184         int rc;
 185
 186         if (!WC->connected)
 187                 return -1;
 188
 189         FlushStrBuf(buf);
 190         rc = StrBufTCP_read_buffered_line_fast(buf,
 191                                                WC->ReadBuf,
 192                                                &WC->ReadPos,
 193                                                &WC->serv_sock,
 194                                                5, 1,
 195                                                &ErrStr);
 196         if (rc < 0)
 197         {
 198                 syslog(LOG_INFO, "StrBuf_ServGetln(): Server connection broken: %s\n",
 199                         (ErrStr)?ErrStr:"");
 200                 wc_backtrace(LOG_INFO);
 201                 if (WC->serv_sock > 0) close(WC->serv_sock);
 202                 WC->serv_sock = (-1);
 203                 WC->connected = 0;
 204                 WC->logged_in = 0;
 205         }
 206 #ifdef SERV_TRACE
 207         else
 208         {
 209                 long pos = 0;
 210                 if (WC->ReadPos != NULL)
 211                         pos = WC->ReadPos - ChrPtr(WC->ReadBuf);
 212                 syslog(LOG_DEBUG, "%3d<<<[%ld]%s\n", WC->serv_sock, pos, ChrPtr(buf));
 213         }
 214 #endif
 215         return rc;
 216 }
 217
 218 int StrBuf_ServGetBLOBBuffered(StrBuf *buf, long BlobSize)
 219 {
 220         const char *ErrStr;
 221         int rc;
 222
 223         rc = StrBufReadBLOBBuffered(buf,
 224                                     WC->ReadBuf,
 225                                     &WC->ReadPos,
 226                                     &WC->serv_sock,
 227                                     1,
 228                                     BlobSize,
 229                                     NNN_TERM,
 230                                     &ErrStr);
 231         if (rc < 0)
 232         {
 233                 syslog(LOG_INFO, "StrBuf_ServGetBLOBBuffered(): Server connection broken: %s\n",
 234                         (ErrStr)?ErrStr:"");
 235                 wc_backtrace(LOG_INFO);
 236                 if (WC->serv_sock > 0) close(WC->serv_sock);
 237                 WC->serv_sock = (-1);
 238                 WC->connected = 0;
 239                 WC->logged_in = 0;
 240         }
 241 #ifdef SERV_TRACE
 242         else
 243                 syslog(LOG_DEBUG, "%3d<<<BLOB: %d bytes\n", WC->serv_sock, StrLength(buf));
 244 #endif
 245
 246         return rc;
 247 }
 248
 249 int StrBuf_ServGetBLOB(StrBuf *buf, long BlobSize)
 250 {
 251         const char *ErrStr;
 252         int rc;
 253
 254         WC->ReadPos = NULL;
 255         rc = StrBufReadBLOB(buf, &WC->serv_sock, 1, BlobSize, &ErrStr);
 256         if (rc < 0)
 257         {
 258                 syslog(LOG_INFO, "StrBuf_ServGetBLOB(): Server connection broken: %s\n",
 259                         (ErrStr)?ErrStr:"");
 260                 wc_backtrace(LOG_INFO);
 261                 if (WC->serv_sock > 0) close(WC->serv_sock);
 262                 WC->serv_sock = (-1);
 263                 WC->connected = 0;
 264                 WC->logged_in = 0;
 265         }
 266 #ifdef SERV_TRACE
 267         else
 268                 syslog(LOG_DEBUG, "%3d<<<BLOB: %d bytes\n", WC->serv_sock, StrLength(buf));
 269 #endif
 270
 271         return rc;
 272 }
 273
 274
 275 void FlushReadBuf (void)
 276 {
 277         long len;
 278         const char *pch;
 279         const char *pche;
 280
 281         len = StrLength(WC->ReadBuf);
 282         if ((len > 0) &&
 283             (WC->ReadPos != NULL) &&
 284             (WC->ReadPos != StrBufNOTNULL))
 285
 286         {
 287                 pch = ChrPtr(WC->ReadBuf);
 288                 pche = pch + len;
 289                 if (WC->ReadPos != pche)
 290                 {
 291                         syslog(LOG_ERR,
 292                                 "ERROR: somebody didn't eat his soup! Remaing Chars: %ld [%s]\n",
 293                                 (long)(pche - WC->ReadPos),
 294                                 pche
 295                         );
 296                         syslog(LOG_ERR,
 297                                 "--------------------------------------------------------------------------------\n"
 298                                 "Whole buf: [%s]\n"
 299                                 "--------------------------------------------------------------------------------\n",
 300                                 pch);
 301                         AppendImportantMessage(HKEY("Suppenkasper alert! watch your webcit logfile and get connected to your favourite opensource Crew."));
 302                 }
 303         }
 304
 305         FlushStrBuf(WC->ReadBuf);
 306         WC->ReadPos = NULL;
 307
 308
 309 }
 310
 311
 312 /*
 313  *  send binary to server
 314  *  buf the buffer to write to citadel server
 315  *  nbytes how many bytes to send to citadel server
 316  */
 317 int serv_write(const char *buf, int nbytes)
 318 {
 319         int bytes_written = 0;
 320         int retval;
 321
 322         FlushReadBuf();
 323         while (bytes_written < nbytes) {
 324                 retval = write(WC->serv_sock, &buf[bytes_written],
 325                                nbytes - bytes_written);
 326                 if (retval < 1) {
 327                         const char *ErrStr = strerror(errno);
 328                         syslog(LOG_INFO, "serv_write(): Server connection broken: %s\n",
 329                                 (ErrStr)?ErrStr:"");
 330                         if (WC->serv_sock > 0) close(WC->serv_sock);
 331                         WC->serv_sock = (-1);
 332                         WC->connected = 0;
 333                         WC->logged_in = 0;
 334                         return 0;
 335                 }
 336                 bytes_written = bytes_written + retval;
 337         }
 338         return 1;
 339 }
 340
 341
 342 /*
 343  *  send line to server
 344  *  string the line to send to the citadel server
 345  */
 346 int serv_puts(const char *string)
 347 {
 348 #ifdef SERV_TRACE
 349         syslog(LOG_DEBUG, "%3d>>>%s\n", WC->serv_sock, string);
 350 #endif
 351         FlushReadBuf();
 352
 353         if (!serv_write(string, strlen(string)))
 354                 return 0;
 355         return serv_write("\n", 1);
 356 }
 357
 358 /*
 359  *  send line to server
 360  *  string the line to send to the citadel server
 361  */
 362 int serv_putbuf(const StrBuf *string)
 363 {
 364 #ifdef SERV_TRACE
 365         syslog(LOG_DEBUG, "%3d>>>%s\n", WC->serv_sock, ChrPtr(string));
 366 #endif
 367         FlushReadBuf();
 368
 369         if (!serv_write(ChrPtr(string), StrLength(string)))
 370                 return 0;
 371         return serv_write("\n", 1);
 372 }
 373
 374
 375 /*
 376  *  convenience function to send stuff to the server
 377  *  format the formatstring
 378  *  ... the entities to insert into format
 379  */
 380 int serv_printf(const char *format,...)
 381 {
 382         va_list arg_ptr;
 383         char buf[SIZ];
 384         size_t len;
 385         int rc;
 386
 387         FlushReadBuf();
 388
 389         va_start(arg_ptr, format);
 390         vsnprintf(buf, sizeof buf, format, arg_ptr);
 391         va_end(arg_ptr);
 392
 393         len = strlen(buf);
 394         buf[len++] = '\n';
 395         buf[len] = '\0';
 396         rc = serv_write(buf, len);
 397 #ifdef SERV_TRACE
 398         syslog(LOG_DEBUG, ">>>%s", buf);
 399 #endif
 400         return rc;
 401 }
 402
 403
 404 /*
 405  * Read binary data from server into memory using a series of server READ commands.
 406  * returns the read content as StrBuf
 407  */
 408 int serv_read_binary(StrBuf *Ret, size_t total_len, StrBuf *Buf)
 409 {
 410         size_t bytes_read = 0;
 411         size_t this_block = 0;
 412         int rc = 6;
 413         int ServerRc = 6;
 414
 415         if (Ret == NULL) {
 416                 return -1;
 417         }
 418
 419         while ((bytes_read < total_len) && (ServerRc == 6)) {
 420
 421                 if (WC->serv_sock==-1) {
 422                         FlushStrBuf(Ret);
 423                         return -1;
 424                 }
 425
 426                 serv_printf("READ "SIZE_T_FMT"|"SIZE_T_FMT, bytes_read, total_len-bytes_read);
 427                 if ( (rc = StrBuf_ServGetln(Buf) > 0) &&
 428                      (ServerRc = GetServerStatus(Buf, NULL), ServerRc == 6) )
 429                 {
 430                         if (rc < 0)
 431                                 return rc;
 432                         StrBufCutLeft(Buf, 4);
 433                         this_block = StrTol(Buf);
 434                         rc = StrBuf_ServGetBLOBBuffered(Ret, this_block);
 435                         if (rc < 0) {
 436                                 syslog(LOG_INFO, "Server connection broken during download\n");
 437                                 wc_backtrace(LOG_INFO);
 438                                 if (WC->serv_sock > 0) close(WC->serv_sock);
 439                                 WC->serv_sock = (-1);
 440                                 WC->connected = 0;
 441                                 WC->logged_in = 0;
 442                                 return rc;
 443                         }
 444                         bytes_read += rc;
 445                 }
 446         }
 447
 448         return StrLength(Ret);
 449 }
 450
 451
 452 int client_write(StrBuf *ThisBuf)
 453 {
 454         const char *ptr, *eptr;
 455         long count;
 456         ssize_t res = 0;
 457         fd_set wset;
 458         int fdflags;
 459
 460         ptr = ChrPtr(ThisBuf);
 461         count = StrLength(ThisBuf);
 462         eptr = ptr + count;
 463
 464         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 465
 466         while ((ptr < eptr) && (WC->Hdr->http_sock != -1)) {
 467                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 468                         FD_ZERO(&wset);
 469                         FD_SET(WC->Hdr->http_sock, &wset);
 470                         if (select(WC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 471                                 syslog(LOG_INFO, "client_write: Socket select failed (%s)\n", strerror(errno));
 472                                 return -1;
 473                         }
 474                 }
 475
 476                 if ((WC->Hdr->http_sock == -1) ||
 477                     ((res = write(WC->Hdr->http_sock, ptr, count)),
 478                      (res == -1)))
 479                 {
 480                         syslog(LOG_INFO, "client_write: Socket write failed (%s)\n", strerror(errno));
 481                         wc_backtrace(LOG_INFO);
 482                         return -1;
 483                 }
 484                 count -= res;
 485                 ptr += res;
 486         }
 487         return 0;
 488 }
 489
 490
 491 int
 492 read_serv_chunk(
 493
 494         StrBuf *Buf,
 495         size_t total_len,
 496         size_t *bytes_read
 497         )
 498 {
 499         int rc;
 500         int ServerRc;
 501
 502         serv_printf("READ "SIZE_T_FMT"|"SIZE_T_FMT, *bytes_read, total_len-(*bytes_read));
 503         if ( (rc = StrBuf_ServGetln(Buf) > 0) &&
 504              (ServerRc = GetServerStatus(Buf, NULL), ServerRc == 6) )
 505         {
 506                 size_t this_block = 0;
 507
 508                 if (rc < 0)
 509                         return rc;
 510
 511                 StrBufCutLeft(Buf, 4);
 512                 this_block = StrTol(Buf);
 513                 rc = StrBuf_ServGetBLOBBuffered(WC->WBuf, this_block);
 514                 if (rc < 0) {
 515                         syslog(LOG_INFO, "Server connection broken during download\n");
 516                         wc_backtrace(LOG_INFO);
 517                         if (WC->serv_sock > 0) close(WC->serv_sock);
 518                         WC->serv_sock = (-1);
 519                         WC->connected = 0;
 520                         WC->logged_in = 0;
 521                         return rc;
 522                 }
 523                 *bytes_read += rc;
 524         }
 525         return 6;
 526 }
 527
 528 static inline int send_http(StrBuf *Buf)
 529 {
 530 #ifdef HAVE_OPENSSL
 531         if (is_https)
 532                 return client_write_ssl(Buf);
 533         else
 534 #endif
 535                 return client_write(Buf);
 536 }
 537 /*
 538  * Read binary data from server into memory using a series of server READ commands.
 539  * returns the read content as StrBuf
 540  */
 541 void serv_read_binary_to_http(StrBuf *MimeType, size_t total_len, int is_static, int detect_mime)
 542 {
 543         int ServerRc = 6;
 544         size_t bytes_read = 0;
 545         int first = 1;
 546         int client_con_state = 0;
 547         int chunked = 0;
 548         int is_gzip = 0;
 549         const char *Err = NULL;
 550         StrBuf *BufHeader = NULL;
 551         StrBuf *Buf;
 552         StrBuf *pBuf = NULL;
 553         vStreamT *SC = NULL;
 554         IOBuffer ReadBuffer;
 555         IOBuffer WriteBuffer;
 556
 557
 558         Buf = NewStrBuf();
 559
 560         if (WC->Hdr->HaveRange)
 561         {
 562                 WC->Hdr->HaveRange++;
 563                 WC->Hdr->TotalBytes = total_len;
 564                 /* open range? or beyound file border? correct the numbers. */
 565                 if ((WC->Hdr->RangeTil == -1) || (WC->Hdr->RangeTil>= total_len))
 566                         WC->Hdr->RangeTil = total_len - 1;
 567                 bytes_read = WC->Hdr->RangeStart;
 568                 total_len = WC->Hdr->RangeTil;
 569         }
 570         else
 571                 chunked = total_len > SIZ * 10; /* TODO: disallow for HTTP / 1.0 */
 572
 573         if (chunked)
 574         {
 575                 BufHeader = NewStrBuf();
 576         }
 577
 578         if ((detect_mime != 0) && (bytes_read != 0))
 579         {
 580                 /* need to read first chunk to detect mime, though the client doesn't care */
 581                 size_t bytes_read = 0;
 582                 const char *CT;
 583
 584                 ServerRc = read_serv_chunk(
 585                         Buf,
 586                         total_len,
 587                         &bytes_read);
 588
 589                 if (ServerRc != 6)
 590                 {
 591                         FreeStrBuf(&BufHeader);
 592                         FreeStrBuf(&Buf);
 593                         return;
 594                 }
 595                 CT = GuessMimeType(SKEY(WC->WBuf));
 596                 FlushStrBuf(WC->WBuf);
 597                 StrBufPlain(MimeType, CT, -1);
 598                 CheckGZipCompressionAllowed(SKEY(MimeType));
 599                 detect_mime = 0;
 600                 FreeStrBuf(&Buf);
 601         }
 602
 603         memset(&WriteBuffer, 0, sizeof(IOBuffer));
 604         if (chunked && !DisableGzip && WC->Hdr->HR.gzip_ok)
 605         {
 606                 is_gzip = 1;
 607                 SC = StrBufNewStreamContext (eZLibEncode, &Err);
 608                 if (SC == NULL) {
 609                         syslog(LOG_ERR, "Error while initializing stream context: %s", Err);
 610                         FreeStrBuf(&Buf);
 611                         return;
 612                 }
 613
 614                 memset(&ReadBuffer, 0, sizeof(IOBuffer));
 615                 ReadBuffer.Buf = WC->WBuf;
 616
 617                 WriteBuffer.Buf = NewStrBufPlain(NULL, SIZ*2);;
 618                 pBuf = WriteBuffer.Buf;
 619         }
 620         else
 621         {
 622                 pBuf = WC->WBuf;
 623         }
 624
 625         if (!detect_mime)
 626         {
 627                 http_transmit_headers(ChrPtr(MimeType), is_static, chunked, is_gzip);
 628
 629                 if (send_http(WC->HBuf) < 0)
 630                 {
 631                         FreeStrBuf(&Buf);
 632                         FreeStrBuf(&WriteBuffer.Buf);
 633                         FreeStrBuf(&BufHeader);
 634                         if (StrBufDestroyStreamContext(eZLibEncode, &SC, &Err) && Err) {
 635                                 syslog(LOG_ERR, "Error while destroying stream context: %s", Err);
 636                         }
 637                         return;
 638                 }
 639         }
 640
 641         while ((bytes_read < total_len) &&
 642                (ServerRc == 6) &&
 643                (client_con_state == 0))
 644         {
 645
 646                 if (WC->serv_sock==-1) {
 647                         FlushStrBuf(WC->WBuf);
 648                         FreeStrBuf(&Buf);
 649                         FreeStrBuf(&WriteBuffer.Buf);
 650                         FreeStrBuf(&BufHeader);
 651                         StrBufDestroyStreamContext(eZLibEncode, &SC, &Err);
 652                         if (StrBufDestroyStreamContext(eZLibEncode, &SC, &Err) && Err) {
 653                                 syslog(LOG_ERR, "Error while destroying stream context: %s", Err);
 654                         }
 655                         return;
 656                 }
 657
 658                 ServerRc = read_serv_chunk(
 659                         Buf,
 660                         total_len,
 661                         &bytes_read);
 662                 if (ServerRc != 6)
 663                         break;
 664
 665                 if (detect_mime)
 666                 {
 667                         const char *CT;
 668                         detect_mime = 0;
 669
 670                         CT = GuessMimeType(SKEY(WC->WBuf));
 671                         StrBufPlain(MimeType, CT, -1);
 672                         if (is_gzip) {
 673                                 CheckGZipCompressionAllowed(SKEY(MimeType));
 674                                 is_gzip = WC->Hdr->HR.gzip_ok;
 675                         }
 676                         http_transmit_headers(ChrPtr(MimeType), is_static, chunked, is_gzip);
 677
 678                         client_con_state = send_http(WC->HBuf);
 679                 }
 680
 681                 if (is_gzip)
 682                 {
 683                         int done = (bytes_read == total_len);
 684                         while ((IOBufferStrLength(&ReadBuffer) > 0) && (client_con_state == 0)) {
 685                                 int rc;
 686
 687                                 do {
 688                                         rc = StrBufStreamTranscode(eZLibEncode, &WriteBuffer, &ReadBuffer, NULL, -1, SC, done, &Err);
 689
 690                                         if (StrLength (pBuf) > 0) {
 691                                                 StrBufPrintf(BufHeader, "%s%x\r\n",
 692                                                      (first)?"":"\r\n",
 693                                                              StrLength (pBuf));
 694                                                 first = 0;
 695                                                 client_con_state = send_http(BufHeader);
 696                                                 if (client_con_state == 0) {
 697                                                         client_con_state = send_http(pBuf);
 698                                                 }
 699                                                 FlushStrBuf(pBuf);
 700                                         }
 701                                 } while ((rc == 1) && (StrLength(pBuf) > 0));
 702                         }
 703                         FlushStrBuf(WC->WBuf);
 704                 }
 705                 else {
 706                         if ((chunked) && (client_con_state == 0))
 707                         {
 708                                 StrBufPrintf(BufHeader, "%s%x\r\n",
 709                                              (first)?"":"\r\n",
 710                                              StrLength (pBuf));
 711                                 first = 0;
 712                                 client_con_state = send_http(BufHeader);
 713                         }
 714
 715                         if (client_con_state == 0)
 716                                 client_con_state = send_http(pBuf);
 717
 718                         FlushStrBuf(pBuf);
 719                 }
 720         }
 721
 722         if (SC && StrBufDestroyStreamContext(eZLibEncode, &SC, &Err) && Err) {
 723                 syslog(LOG_ERR, "Error while destroying stream context: %s", Err);
 724         }
 725         FreeStrBuf(&WriteBuffer.Buf);
 726         if ((chunked) && (client_con_state == 0))
 727         {
 728                 StrBufPlain(BufHeader, HKEY("\r\n0\r\n\r\n"));
 729                 if (send_http(BufHeader) < 0)
 730                 {
 731                         FreeStrBuf(&Buf);
 732                         FreeStrBuf(&BufHeader);
 733                         return;
 734                 }
 735         }
 736         FreeStrBuf(&BufHeader);
 737         FreeStrBuf(&Buf);
 738 }
 739
 740 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 741 {
 742         const char *Error;
 743 #ifdef HAVE_OPENSSL
 744         const char *pch, *pchs;
 745         int rlen, len, retval = 0;
 746
 747         if (is_https) {
 748                 int ntries = 0;
 749                 if (StrLength(Hdr->ReadBuf) > 0)
 750                 {
 751                         pchs = ChrPtr(Hdr->ReadBuf);
 752                         pch = strchr(pchs, '\n');
 753                         if (pch != NULL) {
 754                                 rlen = 0;
 755                                 len = pch - pchs;
 756                                 if (len > 0 && (*(pch - 1) == '\r') )
 757                                         rlen ++;
 758                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 759                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 760                                 return len - rlen;
 761                         }
 762                 }
 763
 764                 while (retval == 0) {
 765                                 pch = NULL;
 766                                 pchs = ChrPtr(Hdr->ReadBuf);
 767                                 if (*pchs != '\0')
 768                                         pch = strchr(pchs, '\n');
 769                                 if (pch == NULL) {
 770                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 771                                         pchs = ChrPtr(Hdr->ReadBuf);
 772                                         pch = strchr(pchs, '\n');
 773                                         if (pch == NULL)
 774                                                 retval = 0;
 775                                 }
 776                                 if (retval == 0) {
 777                                         sleeeeeeeeeep(1);
 778                                         ntries ++;
 779                                 }
 780                                 if (ntries > 10)
 781                                         return 0;
 782                 }
 783                 if ((retval > 0) && (pch != NULL)) {
 784                         rlen = 0;
 785                         len = pch - pchs;
 786                         if (len > 0 && (*(pch - 1) == '\r') )
 787                                 rlen ++;
 788                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 789                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 790                         return len - rlen;
 791
 792                 }
 793                 else
 794                         return -1;
 795         }
 796         else
 797 #endif
 798                 return StrBufTCP_read_buffered_line_fast(Target,
 799                                                          Hdr->ReadBuf,
 800                                                          &Hdr->Pos,
 801                                                          &Hdr->http_sock,
 802                                                          5,
 803                                                          1,
 804                                                          &Error);
 805 }
 806
 807
 808 /*
 809  * This is a generic function to set up a master socket for listening on
 810  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 811  *
 812  * ip_addr      IP address to bind
 813  * port_number  port number to bind
 814  * queue_len    number of incoming connections to allow in the queue
 815  */
 816 int webcit_tcp_server(const char *ip_addr, int port_number, int queue_len)
 817 {
 818         const char *ipv4broadcast = "0.0.0.0";
 819         int IsDefault = 0;
 820         struct protoent *p;
 821         struct sockaddr_in6 sin6;
 822         struct sockaddr_in sin4;
 823         int s, i, b;
 824         int ip_version = 6;
 825
 826 retry:
 827         memset(&sin6, 0, sizeof(sin6));
 828         memset(&sin4, 0, sizeof(sin4));
 829         sin6.sin6_family = AF_INET6;
 830         sin4.sin_family = AF_INET;
 831
 832         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 833                 || (IsEmptyStr(ip_addr))
 834                 || (!strcmp(ip_addr, "*"))
 835         ) {
 836                 IsDefault = 1;
 837                 ip_version = 6;
 838                 sin6.sin6_addr = in6addr_any;
 839         }
 840         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 841         {
 842                 ip_version = 4;
 843                 sin4.sin_addr.s_addr = INADDR_ANY;
 844         }
 845         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 846         {
 847                 ip_version = 4;
 848                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 849                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 850                         return (-WC_EXIT_BIND);
 851                 }
 852         }
 853         else                                                                            /* specific IPv6 */
 854         {
 855                 ip_version = 6;
 856                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 857                         syslog(LOG_WARNING, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 858                         return (-WC_EXIT_BIND);
 859                 }
 860         }
 861
 862         if (port_number == 0) {
 863                 syslog(LOG_WARNING, "Cannot start: no port number specified.\n");
 864                 return (-WC_EXIT_BIND);
 865         }
 866         sin6.sin6_port = htons((u_short) port_number);
 867         sin4.sin_port = htons((u_short) port_number);
 868
 869         p = getprotobyname("tcp");
 870
 871         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 872         if (s < 0) {
 873                 if (IsDefault && (errno == EAFNOSUPPORT))
 874                 {
 875                         s = 0;
 876                         ip_addr = ipv4broadcast;
 877                         goto retry;
 878                 }
 879                 syslog(LOG_WARNING, "Can't create a listening socket: %s\n", strerror(errno));
 880                 return (-WC_EXIT_BIND);
 881         }
 882         /* Set some socket options that make sense. */
 883         i = 1;
 884         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 885
 886         if (ip_version == 6) {
 887                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 888         }
 889         else {
 890                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 891         }
 892
 893         if (b < 0) {
 894                 syslog(LOG_ERR, "Can't bind: %s\n", strerror(errno));
 895                 close(s);
 896                 return (-WC_EXIT_BIND);
 897         }
 898
 899         if (listen(s, queue_len) < 0) {
 900                 syslog(LOG_ERR, "Can't listen: %s\n", strerror(errno));
 901                 close(s);
 902                 return (-WC_EXIT_BIND);
 903         }
 904         return (s);
 905 }
 906
 907
 908 /*
 909  * Create a Unix domain socket and listen on it
 910  * sockpath - file name of the unix domain socket
 911  * queue_len - Number of incoming connections to allow in the queue
 912  */
 913 int webcit_uds_server(char *sockpath, int queue_len) {
 914         struct sockaddr_un addr;
 915         int s;
 916         int i;
 917         int actual_queue_len;
 918
 919         actual_queue_len = queue_len;
 920         if (actual_queue_len < 5) actual_queue_len = 5;
 921
 922         i = unlink(sockpath);
 923         if ((i != 0) && (errno != ENOENT)) {
 924                 syslog(LOG_WARNING, "webcit: can't unlink %s: %s\n",
 925                         sockpath, strerror(errno));
 926                 return (-WC_EXIT_BIND);
 927         }
 928
 929         memset(&addr, 0, sizeof(addr));
 930         addr.sun_family = AF_UNIX;
 931         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 932
 933         s = socket(AF_UNIX, SOCK_STREAM, 0);
 934         if (s < 0) {
 935                 syslog(LOG_WARNING, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 936                 return (-WC_EXIT_BIND);
 937         }
 938
 939         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 940                 syslog(LOG_WARNING, "webcit: Can't bind: %s\n", strerror(errno));
 941                 close(s);
 942                 return (-WC_EXIT_BIND);
 943         }
 944
 945         if (listen(s, actual_queue_len) < 0) {
 946                 syslog(LOG_WARNING, "webcit: Can't listen: %s\n", strerror(errno));
 947                 close(s);
 948                 return (-WC_EXIT_BIND);
 949         }
 950
 951         chmod(sockpath, 0777);
 952         return(s);
 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         const char *Error;
 971         int retval = 0;
 972
 973 #ifdef HAVE_OPENSSL
 974         if (is_https) {
 975                 long bufremain = 0;
 976                 long baselen;
 977
 978                 baselen = StrLength(Target);
 979
 980                 if (Hdr->Pos == NULL) {
 981                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 982                 }
 983
 984                 if (StrLength(Hdr->ReadBuf) > 0) {
 985                         bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 986
 987                         if (bytes < bufremain)
 988                                 bufremain = bytes;
 989                         StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 990                         StrBufCutLeft(Hdr->ReadBuf, bufremain);
 991                 }
 992
 993                 if (bytes > bufremain) {
 994                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 995                                (retval >= 0))
 996                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 997                         if (retval >= 0) {
 998                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 999                                 return 1;
1000                         }
1001                         else {
1002                                 syslog(LOG_INFO, "client_read_ssl() failed\n");
1003                                 return -1;
1004                         }
1005                 }
1006                 else
1007                         return 1;
1008         }
1009 #endif
1010         retval = StrBufReadBLOBBuffered(Target,
1011                                         Hdr->ReadBuf,
1012                                         &Hdr->Pos,
1013                                         &Hdr->http_sock,
1014                                         1,
1015                                         bytes,
1016                                         O_TERM,
1017                                         &Error);
1018         if (retval < 0) {
1019                 syslog(LOG_INFO, "client_read() failed: %s\n", Error);
1020                 wc_backtrace(LOG_DEBUG);
1021                 return retval;
1022         }
1023
1024         return 1;
1025 }
1026
1027
1028 /*
1029  * Begin buffering HTTP output so we can transmit it all in one write operation later.
1030  */
1031 void begin_burst(void)
1032 {
1033         if (WC->WBuf == NULL) {
1034                 WC->WBuf = NewStrBufPlain(NULL, 32768);
1035         }
1036 }
1037
1038
1039 /*
1040  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
1041  */
1042 long end_burst(void)
1043 {
1044         const char *ptr, *eptr;
1045         long count;
1046         ssize_t res = 0;
1047         fd_set wset;
1048         int fdflags;
1049
1050         if (!DisableGzip && (WC->Hdr->HR.gzip_ok))
1051         {
1052                 if (CompressBuffer(WC->WBuf) > 0)
1053                         hprintf("Content-encoding: gzip\r\n");
1054                 else {
1055                         syslog(LOG_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
1056                         wc_backtrace(LOG_INFO);
1057                 }
1058         }
1059
1060         if (WC->WFBuf != NULL) {
1061                 WildFireSerializePayload(WC->WFBuf, WC->HBuf, &WC->Hdr->nWildfireHeaders, NULL);
1062                 FreeStrBuf(&WC->WFBuf);
1063         }
1064
1065         if (WC->Hdr->HR.prohibit_caching)
1066                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
1067         hprintf("Content-length: %d\r\n\r\n", StrLength(WC->WBuf));
1068
1069         ptr = ChrPtr(WC->HBuf);
1070         count = StrLength(WC->HBuf);
1071         eptr = ptr + count;
1072
1073 #ifdef HAVE_OPENSSL
1074         if (is_https) {
1075                 client_write_ssl(WC->HBuf);
1076                 client_write_ssl(WC->WBuf);
1077                 return (count);
1078         }
1079 #endif
1080
1081         if (WC->Hdr->http_sock == -1) {
1082                 return -1;
1083         }
1084         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
1085
1086         while ((ptr < eptr) && (WC->Hdr->http_sock != -1)) {
1087                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
1088                         FD_ZERO(&wset);
1089                         FD_SET(WC->Hdr->http_sock, &wset);
1090                         if (select(WC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
1091                                 syslog(LOG_DEBUG, "client_write: Socket select failed (%s)\n", strerror(errno));
1092                                 return -1;
1093                         }
1094                 }
1095
1096                 if ((WC->Hdr->http_sock == -1) ||
1097                     (res = write(WC->Hdr->http_sock,
1098                                  ptr,
1099                                  count)) == -1) {
1100                         syslog(LOG_DEBUG, "client_write: Socket write failed (%s)\n", strerror(errno));
1101                         wc_backtrace(LOG_INFO);
1102                         return res;
1103                 }
1104                 count -= res;
1105                 ptr += res;
1106         }
1107
1108         ptr = ChrPtr(WC->WBuf);
1109         count = StrLength(WC->WBuf);
1110         eptr = ptr + count;
1111
1112         while ((ptr < eptr) && (WC->Hdr->http_sock != -1)) {
1113                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
1114                         FD_ZERO(&wset);
1115                         FD_SET(WC->Hdr->http_sock, &wset);
1116                         if (select(WC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
1117                                 syslog(LOG_INFO, "client_write: Socket select failed (%s)\n", strerror(errno));
1118                                 return -1;
1119                         }
1120                 }
1121
1122                 if ((WC->Hdr->http_sock == -1) ||
1123                     (res = write(WC->Hdr->http_sock,
1124                                  ptr,
1125                                  count)) == -1) {
1126                         syslog(LOG_INFO, "client_write: Socket write failed (%s)\n", strerror(errno));
1127                         wc_backtrace(LOG_INFO);
1128                         return res;
1129                 }
1130                 count -= res;
1131                 ptr += res;
1132         }
1133
1134         return StrLength(WC->WBuf);
1135 }
1136
1137
1138 /*
1139  * lingering_close() a`la Apache. see
1140  * http://httpd.apache.org/docs/2.0/misc/fin_wait_2.html for rationale
1141  */
1142 int lingering_close(int fd)
1143 {
1144         char buf[SIZ];
1145         int i;
1146         fd_set set;
1147         struct timeval tv, start;
1148
1149         gettimeofday(&start, NULL);
1150         if (fd == -1)
1151                 return -1;
1152         shutdown(fd, 1);
1153         do {
1154                 do {
1155                         gettimeofday(&tv, NULL);
1156                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
1157                         tv.tv_usec = start.tv_usec - tv.tv_usec;
1158                         if (tv.tv_usec < 0) {
1159                                 tv.tv_sec--;
1160                                 tv.tv_usec += 1000000;
1161                         }
1162                         FD_ZERO(&set);
1163                         FD_SET(fd, &set);
1164                         i = select(fd + 1, &set, NULL, NULL, &tv);
1165                 } while (i == -1 && errno == EINTR);
1166
1167                 if (i <= 0)
1168                         break;
1169
1170                 i = read(fd, buf, sizeof buf);
1171         } while (i != 0 && (i != -1 || errno == EINTR));
1172
1173         return close(fd);
1174 }
1175
1176 void
1177 HttpNewModule_TCPSOCKETS
1178 (ParsedHttpHdrs *httpreq)
1179 {
1180
1181         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
1182 }
1183
1184 void
1185 HttpDetachModule_TCPSOCKETS
1186 (ParsedHttpHdrs *httpreq)
1187 {
1188
1189         FlushStrBuf(httpreq->ReadBuf);
1190         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
1191 }
1192
1193 void
1194 HttpDestroyModule_TCPSOCKETS
1195 (ParsedHttpHdrs *httpreq)
1196 {
1197
1198         FreeStrBuf(&httpreq->ReadBuf);
1199 }
1200
1201
1202 void
1203 SessionNewModule_TCPSOCKETS
1204 (wcsession *sess)
1205 {
1206         sess->CLineBuf = NewStrBuf();
1207         sess->MigrateReadLineBuf = NewStrBuf();
1208 }
1209
1210 void
1211 SessionDestroyModule_TCPSOCKETS
1212 (wcsession *sess)
1213 {
1214         FreeStrBuf(&sess->CLineBuf);
1215         FreeStrBuf(&sess->ReadBuf);
1216         sess->connected = 0;
1217         sess->ReadPos = NULL;
1218         FreeStrBuf(&sess->MigrateReadLineBuf);
1219         if (sess->serv_sock > 0) {
1220                 syslog(LOG_DEBUG, "Closing socket %d", sess->serv_sock);
1221                 close(sess->serv_sock);
1222         }
1223         sess->serv_sock = -1;
1224 }