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