webcit/tcp_sockets.c

   1 /*
   2  * Copyright (c) 1987-2011 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 as published by
   6  * the Free Software Foundation; either version 3 of the License, or
   7  * (at your option) any later version.
   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  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  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         FlushStrBuf(buf);
 176         rc = StrBufTCP_read_buffered_line_fast(buf,
 177                                                WCC->ReadBuf,
 178                                                &WCC->ReadPos,
 179                                                &WCC->serv_sock,
 180                                                5, 1,
 181                                                &ErrStr);
 182         if (rc < 0)
 183         {
 184                 syslog(1, "StrBuf_ServGetln(): Server connection broken: %s\n",
 185                         (ErrStr)?ErrStr:"");
 186                 wc_backtrace();
 187                 if (WCC->serv_sock > 0) close(WCC->serv_sock);
 188                 WCC->serv_sock = (-1);
 189                 WCC->connected = 0;
 190                 WCC->logged_in = 0;
 191         }
 192 #ifdef SERV_TRACE
 193         else
 194         {
 195                 long pos = 0;
 196                 if (WCC->ReadPos != NULL)
 197                         pos = WCC->ReadPos - ChrPtr(WCC->ReadBuf);
 198                 syslog(9, "%3d<<<[%ld]%s\n", WC->serv_sock, pos, ChrPtr(buf));
 199         }
 200 #endif
 201         return rc;
 202 }
 203
 204 int StrBuf_ServGetBLOBBuffered(StrBuf *buf, long BlobSize)
 205 {
 206         wcsession *WCC = WC;
 207         const char *ErrStr;
 208         int rc;
 209
 210         rc = StrBufReadBLOBBuffered(buf,
 211                                     WCC->ReadBuf,
 212                                     &WCC->ReadPos,
 213                                     &WCC->serv_sock,
 214                                     1,
 215                                     BlobSize,
 216                                     NNN_TERM,
 217                                     &ErrStr);
 218         if (rc < 0)
 219         {
 220                 syslog(1, "StrBuf_ServGetBLOBBuffered(): Server connection broken: %s\n",
 221                         (ErrStr)?ErrStr:"");
 222                 wc_backtrace();
 223                 if (WCC->serv_sock > 0) close(WCC->serv_sock);
 224                 WCC->serv_sock = (-1);
 225                 WCC->connected = 0;
 226                 WCC->logged_in = 0;
 227         }
 228 #ifdef SERV_TRACE
 229         else
 230                 syslog(9, "%3d<<<BLOB: %d bytes\n", WC->serv_sock, StrLength(buf));
 231 #endif
 232
 233         return rc;
 234 }
 235
 236 int StrBuf_ServGetBLOB(StrBuf *buf, long BlobSize)
 237 {
 238         wcsession *WCC = WC;
 239         const char *ErrStr;
 240         int rc;
 241
 242         WCC->ReadPos = NULL;
 243         rc = StrBufReadBLOB(buf, &WCC->serv_sock, 1, BlobSize, &ErrStr);
 244         if (rc < 0)
 245         {
 246                 syslog(1, "StrBuf_ServGetBLOB(): Server connection broken: %s\n",
 247                         (ErrStr)?ErrStr:"");
 248                 wc_backtrace();
 249                 if (WCC->serv_sock > 0) close(WCC->serv_sock);
 250                 WCC->serv_sock = (-1);
 251                 WCC->connected = 0;
 252                 WCC->logged_in = 0;
 253         }
 254 #ifdef SERV_TRACE
 255         else
 256                 syslog(9, "%3d<<<BLOB: %d bytes\n", WC->serv_sock, StrLength(buf));
 257 #endif
 258
 259         return rc;
 260 }
 261
 262
 263 void FlushReadBuf (void)
 264 {
 265         long len;
 266         const char *pch;
 267         const char *pche;
 268         wcsession *WCC = WC;
 269
 270         len = StrLength(WCC->ReadBuf);
 271         if ((len > 0) &&
 272             (WCC->ReadPos != NULL) &&
 273             (WCC->ReadPos != StrBufNOTNULL))
 274
 275         {
 276                 pch = ChrPtr(WCC->ReadBuf);
 277                 pche = pch + len;
 278                 if (WCC->ReadPos != pche)
 279                 {
 280                         syslog(1,
 281                                 "ERROR: somebody didn't eat his soup! Remaing Chars: %ld [%s]\n",
 282                                 (long)(pche - WCC->ReadPos),
 283                                 pche
 284                         );
 285                         syslog(1,
 286                                 "--------------------------------------------------------------------------------\n"
 287                                 "Whole buf: [%s]\n"
 288                                 "--------------------------------------------------------------------------------\n",
 289                                 pch);
 290                         AppendImportantMessage(HKEY("Suppenkasper alert! watch your webcit logfile and get connected to your favourite opensource Crew."));
 291                 }
 292         }
 293
 294         FlushStrBuf(WCC->ReadBuf);
 295         WCC->ReadPos = NULL;
 296
 297
 298 }
 299
 300
 301 /*
 302  *  send binary to server
 303  *  buf the buffer to write to citadel server
 304  *  nbytes how many bytes to send to citadel server
 305  */
 306 int serv_write(const char *buf, int nbytes)
 307 {
 308         wcsession *WCC = WC;
 309         int bytes_written = 0;
 310         int retval;
 311
 312         FlushReadBuf();
 313         while (bytes_written < nbytes) {
 314                 retval = write(WCC->serv_sock, &buf[bytes_written],
 315                                nbytes - bytes_written);
 316                 if (retval < 1) {
 317                         const char *ErrStr = strerror(errno);
 318                         syslog(1, "serv_write(): Server connection broken: %s\n",
 319                                 (ErrStr)?ErrStr:"");
 320                         if (WCC->serv_sock > 0) close(WCC->serv_sock);
 321                         WCC->serv_sock = (-1);
 322                         WCC->connected = 0;
 323                         WCC->logged_in = 0;
 324                         return 0;
 325                 }
 326                 bytes_written = bytes_written + retval;
 327         }
 328         return 1;
 329 }
 330
 331
 332 /*
 333  *  send line to server
 334  *  string the line to send to the citadel server
 335  */
 336 int serv_puts(const char *string)
 337 {
 338 #ifdef SERV_TRACE
 339         syslog(9, "%3d>>>%s\n", WC->serv_sock, string);
 340 #endif
 341         FlushReadBuf();
 342
 343         if (!serv_write(string, strlen(string)))
 344                 return 0;
 345         return serv_write("\n", 1);
 346 }
 347
 348 /*
 349  *  send line to server
 350  *  string the line to send to the citadel server
 351  */
 352 int serv_putbuf(const StrBuf *string)
 353 {
 354 #ifdef SERV_TRACE
 355         syslog(9, "%3d>>>%s\n", WC->serv_sock, ChrPtr(string));
 356 #endif
 357         FlushReadBuf();
 358
 359         if (!serv_write(ChrPtr(string), StrLength(string)))
 360                 return 0;
 361         return serv_write("\n", 1);
 362 }
 363
 364
 365 /*
 366  *  convenience function to send stuff to the server
 367  *  format the formatstring
 368  *  ... the entities to insert into format
 369  */
 370 int serv_printf(const char *format,...)
 371 {
 372         va_list arg_ptr;
 373         char buf[SIZ];
 374         size_t len;
 375         int rc;
 376
 377         FlushReadBuf();
 378
 379         va_start(arg_ptr, format);
 380         vsnprintf(buf, sizeof buf, format, arg_ptr);
 381         va_end(arg_ptr);
 382
 383         len = strlen(buf);
 384         buf[len++] = '\n';
 385         buf[len] = '\0';
 386         rc = serv_write(buf, len);
 387 #ifdef SERV_TRACE
 388         syslog(9, ">>>%s", buf);
 389 #endif
 390         return rc;
 391 }
 392
 393
 394 /*
 395  * Read binary data from server into memory using a series of server READ commands.
 396  * returns the read content as StrBuf
 397  */
 398 int serv_read_binary(StrBuf *Ret, size_t total_len, StrBuf *Buf)
 399 {
 400         wcsession *WCC = WC;
 401         size_t bytes_read = 0;
 402         size_t this_block = 0;
 403         int rc;
 404
 405         if (Ret == NULL) {
 406                 return -1;
 407         }
 408
 409         while (bytes_read < total_len) {
 410
 411                 if (WCC->serv_sock==-1) {
 412                         FlushStrBuf(Ret);
 413                         return -1;
 414                 }
 415
 416                 serv_printf("READ "SIZE_T_FMT"|"SIZE_T_FMT, bytes_read, total_len-bytes_read);
 417                 if ( (rc = StrBuf_ServGetln(Buf) > 0) && (GetServerStatus(Buf, NULL) == 6) )
 418                 {
 419                         if (rc < 0)
 420                                 return rc;
 421                         StrBufCutLeft(Buf, 4);
 422                         this_block = StrTol(Buf);
 423                         rc = StrBuf_ServGetBLOBBuffered(Ret, this_block);
 424                         if (rc < 0) {
 425                                 syslog(1, "Server connection broken during download\n");
 426                                 wc_backtrace();
 427                                 if (WCC->serv_sock > 0) close(WCC->serv_sock);
 428                                 WCC->serv_sock = (-1);
 429                                 WCC->connected = 0;
 430                                 WCC->logged_in = 0;
 431                                 return rc;
 432                         }
 433                         bytes_read += rc;
 434                 }
 435         }
 436
 437         return StrLength(Ret);
 438 }
 439
 440
 441 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 442 {
 443         const char *Error;
 444 #ifdef HAVE_OPENSSL
 445         const char *pch, *pchs;
 446         int rlen, len, retval = 0;
 447
 448         if (is_https) {
 449                 int ntries = 0;
 450                 if (StrLength(Hdr->ReadBuf) > 0)
 451                 {
 452                         pchs = ChrPtr(Hdr->ReadBuf);
 453                         pch = strchr(pchs, '\n');
 454                         if (pch != NULL) {
 455                                 rlen = 0;
 456                                 len = pch - pchs;
 457                                 if (len > 0 && (*(pch - 1) == '\r') )
 458                                         rlen ++;
 459                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 460                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 461                                 return len - rlen;
 462                         }
 463                 }
 464
 465                 while (retval == 0) {
 466                                 pch = NULL;
 467                                 pchs = ChrPtr(Hdr->ReadBuf);
 468                                 if (*pchs != '\0')
 469                                         pch = strchr(pchs, '\n');
 470                                 if (pch == NULL) {
 471                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 472                                         pchs = ChrPtr(Hdr->ReadBuf);
 473                                         pch = strchr(pchs, '\n');
 474                                         if (pch == NULL)
 475                                                 retval = 0;
 476                                 }
 477                                 if (retval == 0) {
 478                                         sleeeeeeeeeep(1);
 479                                         ntries ++;
 480                                 }
 481                                 if (ntries > 10)
 482                                         return 0;
 483                 }
 484                 if ((retval > 0) && (pch != NULL)) {
 485                         rlen = 0;
 486                         len = pch - pchs;
 487                         if (len > 0 && (*(pch - 1) == '\r') )
 488                                 rlen ++;
 489                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 490                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 491                         return len - rlen;
 492
 493                 }
 494                 else
 495                         return -1;
 496         }
 497         else
 498 #endif
 499                 return StrBufTCP_read_buffered_line_fast(Target,
 500                                                          Hdr->ReadBuf,
 501                                                          &Hdr->Pos,
 502                                                          &Hdr->http_sock,
 503                                                          5,
 504                                                          1,
 505                                                          &Error);
 506 }
 507
 508
 509 /*
 510  * This is a generic function to set up a master socket for listening on
 511  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 512  *
 513  * ip_addr      IP address to bind
 514  * port_number  port number to bind
 515  * queue_len    number of incoming connections to allow in the queue
 516  */
 517 int webcit_tcp_server(char *ip_addr, int port_number, int queue_len)
 518 {
 519         struct protoent *p;
 520         struct sockaddr_in6 sin6;
 521         struct sockaddr_in sin4;
 522         int s, i, b;
 523         int ip_version = 6;
 524
 525         memset(&sin6, 0, sizeof(sin6));
 526         memset(&sin4, 0, sizeof(sin4));
 527         sin6.sin6_family = AF_INET6;
 528         sin4.sin_family = AF_INET;
 529
 530         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 531                 || (IsEmptyStr(ip_addr))
 532                 || (!strcmp(ip_addr, "*"))
 533         ) {
 534                 ip_version = 6;
 535                 sin6.sin6_addr = in6addr_any;
 536         }
 537         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 538         {
 539                 ip_version = 4;
 540                 sin4.sin_addr.s_addr = INADDR_ANY;
 541         }
 542         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 543         {
 544                 ip_version = 4;
 545                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 546                         syslog(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 547                         return (-WC_EXIT_BIND);
 548                 }
 549         }
 550         else                                                                            /* specific IPv6 */
 551         {
 552                 ip_version = 6;
 553                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 554                         syslog(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 555                         return (-WC_EXIT_BIND);
 556                 }
 557         }
 558
 559         if (port_number == 0) {
 560                 syslog(1, "Cannot start: no port number specified.\n");
 561                 return (-WC_EXIT_BIND);
 562         }
 563         sin6.sin6_port = htons((u_short) port_number);
 564         sin4.sin_port = htons((u_short) port_number);
 565
 566         p = getprotobyname("tcp");
 567
 568         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 569         if (s < 0) {
 570                 syslog(1, "Can't create a listening socket: %s\n", strerror(errno));
 571                 return (-WC_EXIT_BIND);
 572         }
 573         /* Set some socket options that make sense. */
 574         i = 1;
 575         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 576
 577         if (ip_version == 6) {
 578                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 579         }
 580         else {
 581                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 582         }
 583
 584         if (b < 0) {
 585                 syslog(1, "Can't bind: %s\n", strerror(errno));
 586                 close(s);
 587                 return (-WC_EXIT_BIND);
 588         }
 589
 590         if (listen(s, queue_len) < 0) {
 591                 syslog(1, "Can't listen: %s\n", strerror(errno));
 592                 close(s);
 593                 return (-WC_EXIT_BIND);
 594         }
 595         return (s);
 596 }
 597
 598
 599 /*
 600  * Create a Unix domain socket and listen on it
 601  * sockpath - file name of the unix domain socket
 602  * queue_len - Number of incoming connections to allow in the queue
 603  */
 604 int webcit_uds_server(char *sockpath, int queue_len)
 605 {
 606         struct sockaddr_un addr;
 607         int s;
 608         int i;
 609         int actual_queue_len;
 610
 611         actual_queue_len = queue_len;
 612         if (actual_queue_len < 5) actual_queue_len = 5;
 613
 614         i = unlink(sockpath);
 615         if ((i != 0) && (errno != ENOENT)) {
 616                 syslog(1, "webcit: can't unlink %s: %s\n",
 617                         sockpath, strerror(errno));
 618                 return (-WC_EXIT_BIND);
 619         }
 620
 621         memset(&addr, 0, sizeof(addr));
 622         addr.sun_family = AF_UNIX;
 623         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 624
 625         s = socket(AF_UNIX, SOCK_STREAM, 0);
 626         if (s < 0) {
 627                 syslog(1, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 628                 return (-WC_EXIT_BIND);
 629         }
 630
 631         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 632                 syslog(1, "webcit: Can't bind: %s\n", strerror(errno));
 633                 close(s);
 634                 return (-WC_EXIT_BIND);
 635         }
 636
 637         if (listen(s, actual_queue_len) < 0) {
 638                 syslog(1, "webcit: Can't listen: %s\n", strerror(errno));
 639                 close(s);
 640                 return (-WC_EXIT_BIND);
 641         }
 642
 643         chmod(sockpath, 0777);
 644         return(s);
 645 }
 646
 647
 648
 649
 650 /*
 651  * Read data from the client socket.
 652  *
 653  * sock         socket fd to read from
 654  * buf          buffer to read into
 655  * bytes        number of bytes to read
 656  * timeout      Number of seconds to wait before timing out
 657  *
 658  * Possible return values:
 659  *      1       Requested number of bytes has been read.
 660  *      0       Request timed out.
 661  *      -1      Connection is broken, or other error.
 662  */
 663 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 664 {
 665         const char *Error;
 666         int retval = 0;
 667
 668 #ifdef HAVE_OPENSSL
 669         if (is_https) {
 670                 long bufremain = 0;
 671                 long baselen;
 672
 673                 baselen = StrLength(Target);
 674
 675                 if (Hdr->Pos == NULL)
 676                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 677
 678                 if (StrLength(Hdr->ReadBuf) > 0)
 679                 {
 680                         bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 681
 682                         if (bytes < bufremain)
 683                                 bufremain = bytes;
 684                         StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 685                         StrBufCutLeft(Hdr->ReadBuf, bufremain);
 686                 }
 687
 688                 if (bytes > bufremain)
 689                 {
 690                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 691                                (retval >= 0))
 692                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 693                         if (retval >= 0) {
 694                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 695                                 return 1;
 696                         }
 697                         else {
 698                                 syslog(2, "client_read_ssl() failed\n");
 699                                 return -1;
 700                         }
 701                 }
 702                 else
 703                         return 1;
 704         }
 705 #endif
 706
 707         retval = StrBufReadBLOBBuffered(Target,
 708                                         Hdr->ReadBuf,
 709                                         &Hdr->Pos,
 710                                         &Hdr->http_sock,
 711                                         1,
 712                                         bytes,
 713                                         O_TERM,
 714                                         &Error);
 715         if (retval < 0) {
 716                 syslog(2, "client_read() failed: %s\n",
 717                         Error);
 718                 wc_backtrace();
 719                 return retval;
 720         }
 721
 722         return 1;
 723 }
 724
 725
 726 /*
 727  * Begin buffering HTTP output so we can transmit it all in one write operation later.
 728  */
 729 void begin_burst(void)
 730 {
 731         if (WC->WBuf == NULL) {
 732                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 733         }
 734 }
 735
 736
 737 /*
 738  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
 739  */
 740 long end_burst(void)
 741 {
 742         wcsession *WCC = WC;
 743         const char *ptr, *eptr;
 744         long count;
 745         ssize_t res = 0;
 746         fd_set wset;
 747         int fdflags;
 748
 749         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
 750         {
 751                 if (CompressBuffer(WCC->WBuf) > 0)
 752                         hprintf("Content-encoding: gzip\r\n");
 753                 else {
 754                         syslog(LOG_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
 755                         wc_backtrace();
 756                 }
 757         }
 758
 759         if (WCC->WFBuf != NULL) {
 760                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
 761                 FreeStrBuf(&WCC->WFBuf);
 762         }
 763
 764         if (WCC->Hdr->HR.prohibit_caching)
 765                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
 766         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
 767
 768         ptr = ChrPtr(WCC->HBuf);
 769         count = StrLength(WCC->HBuf);
 770         eptr = ptr + count;
 771
 772 #ifdef HAVE_OPENSSL
 773         if (is_https) {
 774                 client_write_ssl(WCC->HBuf);
 775                 client_write_ssl(WCC->WBuf);
 776                 return (count);
 777         }
 778 #endif
 779
 780         if (WCC->Hdr->http_sock == -1)
 781                 return -1;
 782         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 783
 784         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
 785                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 786                         FD_ZERO(&wset);
 787                         FD_SET(WCC->Hdr->http_sock, &wset);
 788                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 789                                 syslog(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 790                                 return -1;
 791                         }
 792                 }
 793
 794                 if ((WCC->Hdr->http_sock == -1) ||
 795                     (res = write(WCC->Hdr->http_sock,
 796                                  ptr,
 797                                  count)) == -1) {
 798                         syslog(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 799                         wc_backtrace();
 800                         return res;
 801                 }
 802                 count -= res;
 803                 ptr += res;
 804         }
 805
 806         ptr = ChrPtr(WCC->WBuf);
 807         count = StrLength(WCC->WBuf);
 808         eptr = ptr + count;
 809
 810         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
 811                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 812                         FD_ZERO(&wset);
 813                         FD_SET(WCC->Hdr->http_sock, &wset);
 814                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 815                                 syslog(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 816                                 return -1;
 817                         }
 818                 }
 819
 820                 if ((WCC->Hdr->http_sock == -1) ||
 821                     (res = write(WCC->Hdr->http_sock,
 822                                  ptr,
 823                                  count)) == -1) {
 824                         syslog(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 825                         wc_backtrace();
 826                         return res;
 827                 }
 828                 count -= res;
 829                 ptr += res;
 830         }
 831
 832         return StrLength(WCC->WBuf);
 833 }
 834
 835
 836 /*
 837  * lingering_close() a`la Apache. see
 838  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
 839  */
 840 int lingering_close(int fd)
 841 {
 842         char buf[SIZ];
 843         int i;
 844         fd_set set;
 845         struct timeval tv, start;
 846
 847         gettimeofday(&start, NULL);
 848         if (fd == -1)
 849                 return -1;
 850         shutdown(fd, 1);
 851         do {
 852                 do {
 853                         gettimeofday(&tv, NULL);
 854                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
 855                         tv.tv_usec = start.tv_usec - tv.tv_usec;
 856                         if (tv.tv_usec < 0) {
 857                                 tv.tv_sec--;
 858                                 tv.tv_usec += 1000000;
 859                         }
 860                         FD_ZERO(&set);
 861                         FD_SET(fd, &set);
 862                         i = select(fd + 1, &set, NULL, NULL, &tv);
 863                 } while (i == -1 && errno == EINTR);
 864
 865                 if (i <= 0)
 866                         break;
 867
 868                 i = read(fd, buf, sizeof buf);
 869         } while (i != 0 && (i != -1 || errno == EINTR));
 870
 871         return close(fd);
 872 }
 873
 874 void
 875 HttpNewModule_TCPSOCKETS
 876 (ParsedHttpHdrs *httpreq)
 877 {
 878
 879         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
 880 }
 881
 882 void
 883 HttpDetachModule_TCPSOCKETS
 884 (ParsedHttpHdrs *httpreq)
 885 {
 886
 887         FlushStrBuf(httpreq->ReadBuf);
 888         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
 889 }
 890
 891 void
 892 HttpDestroyModule_TCPSOCKETS
 893 (ParsedHttpHdrs *httpreq)
 894 {
 895
 896         FreeStrBuf(&httpreq->ReadBuf);
 897 }
 898
 899
 900 void
 901 SessionNewModule_TCPSOCKETS
 902 (wcsession *sess)
 903 {
 904         sess->CLineBuf = NewStrBuf();
 905         sess->MigrateReadLineBuf = NewStrBuf();
 906 }
 907
 908 void
 909 SessionDestroyModule_TCPSOCKETS
 910 (wcsession *sess)
 911 {
 912         FreeStrBuf(&sess->CLineBuf);
 913         FreeStrBuf(&sess->ReadBuf);
 914         sess->connected = 0;
 915         sess->ReadPos = NULL;
 916         FreeStrBuf(&sess->MigrateReadLineBuf);
 917         if (sess->serv_sock > 0) {
 918                 syslog(LOG_DEBUG, "Closing socket %d", sess->serv_sock);
 919                 close(sess->serv_sock);
 920         }
 921         sess->serv_sock = -1;
 922 }