webcit/tcp_sockets.c

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