webcit/tcp_sockets.c

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