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