webcit/tcp_sockets.c

   1 /*
   2  * Copyright (c) 1987-2011 by the citadel.org team
   3  *
   4  * This program is free 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
  30 /*
  31  * register the timeout
  32  */
  33 RETSIGTYPE timeout(int signum)
  34 {
  35         lprintf(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                 lprintf(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                 lprintf(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, int port)
  72 {
  73         struct sockaddr_in stSockAddr;
  74         int rv;
  75         int sock;
  76
  77         sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
  78         if (sock < 0) {
  79                 lprintf(1, "Can't create socket: %s\n", strerror(errno));
  80                 return (-1);
  81         }
  82
  83         memset(&stSockAddr, 0, sizeof(struct sockaddr_in));
  84         stSockAddr.sin_family = AF_INET;
  85         stSockAddr.sin_port = htons(port);
  86         rv = inet_pton(AF_INET, host, &stSockAddr.sin_addr);
  87
  88         if (rv <= 0) {
  89                 lprintf(1, "Can't grok %s: %s\n", host, strerror(errno));
  90                 return (-1);
  91         }
  92
  93         if (connect(sock, (const struct sockaddr *)&stSockAddr, sizeof(struct sockaddr_in)) != 0) {
  94                 lprintf(1, "Can't connect to %s.%d: %s\n", host, port, strerror(errno));
  95                 close(sock);
  96                 return (-1);
  97         }
  98
  99         return (sock);
 100 }
 101
 102
 103
 104 /*
 105  *  input string from pipe
 106  */
 107 int serv_getln(char *strbuf, int bufsize)
 108 {
 109         wcsession *WCC = WC;
 110         int len;
 111
 112         *strbuf = '\0';
 113         StrBuf_ServGetln(WCC->MigrateReadLineBuf);
 114         len = StrLength(WCC->MigrateReadLineBuf);
 115         if (len > bufsize)
 116                 len = bufsize - 1;
 117         memcpy(strbuf, ChrPtr(WCC->MigrateReadLineBuf), len);
 118         FlushStrBuf(WCC->MigrateReadLineBuf);
 119         strbuf[len] = '\0';
 120 #ifdef SERV_TRACE
 121         lprintf(9, "%3d<<<%s\n", WC->serv_sock, strbuf);
 122 #endif
 123         return len;
 124 }
 125
 126
 127 int StrBuf_ServGetln(StrBuf *buf)
 128 {
 129         wcsession *WCC = WC;
 130         const char *ErrStr = NULL;
 131         int rc;
 132
 133         FlushStrBuf(buf);
 134         rc = StrBufTCP_read_buffered_line_fast(buf,
 135                                                WCC->ReadBuf,
 136                                                &WCC->ReadPos,
 137                                                &WCC->serv_sock,
 138                                                5, 1,
 139                                                &ErrStr);
 140         if (rc < 0)
 141         {
 142                 lprintf(1, "Server connection broken: %s\n",
 143                         (ErrStr)?ErrStr:"");
 144                 wc_backtrace();
 145                 WCC->serv_sock = (-1);
 146                 WCC->connected = 0;
 147                 WCC->logged_in = 0;
 148         }
 149 #ifdef SERV_TRACE
 150         else
 151         {
 152                 long pos = 0;
 153                 if (WCC->ReadPos != NULL)
 154                         pos = WCC->ReadPos - ChrPtr(WCC->ReadBuf);
 155                 lprintf(9, "%3d<<<[%ld]%s\n", WC->serv_sock, pos, ChrPtr(buf));
 156         }
 157 #endif
 158         return rc;
 159 }
 160
 161 int StrBuf_ServGetBLOBBuffered(StrBuf *buf, long BlobSize)
 162 {
 163         wcsession *WCC = WC;
 164         const char *ErrStr;
 165         int rc;
 166
 167         rc = StrBufReadBLOBBuffered(buf,
 168                                     WCC->ReadBuf,
 169                                     &WCC->ReadPos,
 170                                     &WCC->serv_sock,
 171                                     1,
 172                                     BlobSize,
 173                                     NNN_TERM,
 174                                     &ErrStr);
 175         if (rc < 0)
 176         {
 177                 lprintf(1, "Server connection broken: %s\n",
 178                         (ErrStr)?ErrStr:"");
 179                 wc_backtrace();
 180                 WCC->serv_sock = (-1);
 181                 WCC->connected = 0;
 182                 WCC->logged_in = 0;
 183         }
 184 #ifdef SERV_TRACE
 185         else
 186                 lprintf(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 187 #endif
 188
 189         return rc;
 190 }
 191
 192 int StrBuf_ServGetBLOB(StrBuf *buf, long BlobSize)
 193 {
 194         wcsession *WCC = WC;
 195         const char *ErrStr;
 196         int rc;
 197
 198         WCC->ReadPos = NULL;
 199         rc = StrBufReadBLOB(buf, &WCC->serv_sock, 1, BlobSize, &ErrStr);
 200         if (rc < 0)
 201         {
 202                 lprintf(1, "Server connection broken: %s\n",
 203                         (ErrStr)?ErrStr:"");
 204                 wc_backtrace();
 205                 WCC->serv_sock = (-1);
 206                 WCC->connected = 0;
 207                 WCC->logged_in = 0;
 208         }
 209 #ifdef SERV_TRACE
 210         else
 211                 lprintf(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 212 #endif
 213
 214         return rc;
 215 }
 216
 217 /*
 218  *  send binary to server
 219  *  buf the buffer to write to citadel server
 220  *  nbytes how many bytes to send to citadel server
 221  */
 222 void serv_write(const char *buf, int nbytes)
 223 {
 224         wcsession *WCC = WC;
 225         int bytes_written = 0;
 226         int retval;
 227
 228         FlushStrBuf(WCC->ReadBuf);
 229         WCC->ReadPos = NULL;
 230         while (bytes_written < nbytes) {
 231                 retval = write(WCC->serv_sock, &buf[bytes_written],
 232                                nbytes - bytes_written);
 233                 if (retval < 1) {
 234                         const char *ErrStr = strerror(errno);
 235                         lprintf(1, "Server connection broken: %s\n",
 236                                 (ErrStr)?ErrStr:"");
 237                         close(WCC->serv_sock);
 238                         WCC->serv_sock = (-1);
 239                         WCC->connected = 0;
 240                         WCC->logged_in = 0;
 241                         return;
 242                 }
 243                 bytes_written = bytes_written + retval;
 244         }
 245 }
 246
 247
 248 /*
 249  *  send line to server
 250  *  string the line to send to the citadel server
 251  */
 252 void serv_puts(const char *string)
 253 {
 254         wcsession *WCC = WC;
 255 #ifdef SERV_TRACE
 256         lprintf(9, "%3d>>>%s\n", WC->serv_sock, string);
 257 #endif
 258         FlushStrBuf(WCC->ReadBuf);
 259         WCC->ReadPos = NULL;
 260
 261         serv_write(string, strlen(string));
 262         serv_write("\n", 1);
 263 }
 264
 265 /*
 266  *  send line to server
 267  *  string the line to send to the citadel server
 268  */
 269 void serv_putbuf(const StrBuf *string)
 270 {
 271         wcsession *WCC = WC;
 272 #ifdef SERV_TRACE
 273         lprintf(9, "%3d>>>%s\n", WC->serv_sock, ChrPtr(string));
 274 #endif
 275         FlushStrBuf(WCC->ReadBuf);
 276         WCC->ReadPos = NULL;
 277
 278         serv_write(ChrPtr(string), StrLength(string));
 279         serv_write("\n", 1);
 280 }
 281
 282
 283 /*
 284  *  convenience function to send stuff to the server
 285  *  format the formatstring
 286  *  ... the entities to insert into format
 287  */
 288 void serv_printf(const char *format,...)
 289 {
 290         wcsession *WCC = WC;
 291         va_list arg_ptr;
 292         char buf[SIZ];
 293         size_t len;
 294
 295         FlushStrBuf(WCC->ReadBuf);
 296         WCC->ReadPos = NULL;
 297
 298         va_start(arg_ptr, format);
 299         vsnprintf(buf, sizeof buf, format, arg_ptr);
 300         va_end(arg_ptr);
 301
 302         len = strlen(buf);
 303         buf[len++] = '\n';
 304         buf[len] = '\0';
 305         serv_write(buf, len);
 306 #ifdef SERV_TRACE
 307         lprintf(9, ">>>%s", buf);
 308 #endif
 309 }
 310
 311
 312
 313 /*
 314  * Read binary data from server into memory using a series of server READ commands.
 315  * returns the read content as StrBuf
 316  */
 317 int serv_read_binary(StrBuf *Ret, size_t total_len, StrBuf *Buf)
 318 {
 319         wcsession *WCC = WC;
 320         size_t bytes_read = 0;
 321         size_t this_block = 0;
 322         int rc;
 323
 324         if (Ret == NULL) {
 325                 return -1;
 326         }
 327
 328         while (bytes_read < total_len) {
 329
 330                 if (WCC->serv_sock==-1) {
 331                         FlushStrBuf(Ret);
 332                         return -1;
 333                 }
 334
 335                 serv_printf("READ %d|%d", bytes_read, total_len-bytes_read);
 336                 if ( (StrBuf_ServGetln(Buf) > 0) && (GetServerStatus(Buf, NULL) == 6) ) {
 337                         StrBufCutLeft(Buf, 4);
 338                         this_block = StrTol(Buf);
 339                         rc = StrBuf_ServGetBLOBBuffered(Ret, this_block);
 340                         if (rc < 0) {
 341                                 lprintf(1, "Server connection broken during download\n");
 342                                 wc_backtrace();
 343                                 WCC->serv_sock = (-1);
 344                                 WCC->connected = 0;
 345                                 WCC->logged_in = 0;
 346                                 return rc;
 347                         }
 348                         bytes_read += rc;
 349                 }
 350         }
 351
 352         return StrLength(Ret);
 353 }
 354
 355
 356 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 357 {
 358         const char *Error;
 359 #ifdef HAVE_OPENSSL
 360         const char *pch, *pchs;
 361         int rlen, len, retval = 0;
 362
 363         if (is_https) {
 364                 int ntries = 0;
 365                 if (StrLength(Hdr->ReadBuf) > 0) {
 366                         pchs = ChrPtr(Hdr->ReadBuf);
 367                         pch = strchr(pchs, '\n');
 368                         if (pch != NULL) {
 369                                 rlen = 0;
 370                                 len = pch - pchs;
 371                                 if (len > 0 && (*(pch - 1) == '\r') )
 372                                         rlen ++;
 373                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 374                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 375                                 return len - rlen;
 376                         }
 377                 }
 378
 379                 while (retval == 0) {
 380                                 pch = NULL;
 381                                 pchs = ChrPtr(Hdr->ReadBuf);
 382                                 if (*pchs != '\0')
 383                                         pch = strchr(pchs, '\n');
 384                                 if (pch == NULL) {
 385                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 386                                         pchs = ChrPtr(Hdr->ReadBuf);
 387                                         pch = strchr(pchs, '\n');
 388                                 }
 389                                 if (retval == 0) {
 390                                         sleeeeeeeeeep(1);
 391                                         ntries ++;
 392                                 }
 393                                 if (ntries > 10)
 394                                         return 0;
 395                 }
 396                 if ((retval > 0) && (pch != NULL)) {
 397                         rlen = 0;
 398                         len = pch - pchs;
 399                         if (len > 0 && (*(pch - 1) == '\r') )
 400                                 rlen ++;
 401                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 402                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 403                         return len - rlen;
 404
 405                 }
 406                 else
 407                         return -1;
 408         }
 409         else
 410 #endif
 411                 return StrBufTCP_read_buffered_line_fast(Target,
 412                                                          Hdr->ReadBuf,
 413                                                          &Hdr->Pos,
 414                                                          &Hdr->http_sock,
 415                                                          5,
 416                                                          1,
 417                                                          &Error);
 418 }
 419
 420 #ifdef CTDL_IPV6
 421
 422 /*
 423  * This is a generic function to set up a master socket for listening on
 424  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 425  *
 426  * ip_addr      IP address to bind
 427  * port_number  port number to bind
 428  * queue_len    number of incoming connections to allow in the queue
 429  */
 430 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
 431 {
 432         struct protoent *p;
 433         struct sockaddr_in6 sin;
 434         int s, i;
 435
 436         memset(&sin, 0, sizeof(sin));
 437         sin.sin6_family = AF_INET6;
 438
 439         if ((ip_addr == NULL) || (IsEmptyStr(ip_addr)) || (!strcmp(ip_addr, "0.0.0.0"))) {
 440                 sin.sin6_addr = in6addr_any;
 441         } else {
 442                 char bind_to[256];
 443                 if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':'))) {
 444                         snprintf(bind_to, sizeof bind_to, "::ffff:%s", ip_addr);
 445                 }
 446                 else {
 447                         safestrncpy(bind_to, ip_addr, sizeof bind_to);
 448                 }
 449                 if (inet_pton(AF_INET6, bind_to, &sin.sin6_addr) <= 0) {
 450                         lprintf(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 451                         return (-WC_EXIT_BIND);
 452                 }
 453         }
 454
 455         if (port_number == 0) {
 456                 lprintf(1, "Cannot start: no port number specified.\n");
 457                 return (-WC_EXIT_BIND);
 458         }
 459         sin.sin6_port = htons((u_short) port_number);
 460
 461         p = getprotobyname("tcp");
 462
 463         s = socket(PF_INET6, SOCK_STREAM, (p->p_proto));
 464         if (s < 0) {
 465                 lprintf(1, "Can't create an IPv6 socket: %s\n", strerror(errno));
 466                 return (-WC_EXIT_BIND);
 467         }
 468         /* Set some socket options that make sense. */
 469         i = 1;
 470         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 471
 472         #ifndef __APPLE__
 473         fcntl(s, F_SETFL, O_NONBLOCK); /* maide: this statement is incorrect
 474                                           there should be a preceding F_GETFL
 475                                           and a bitwise OR with the previous
 476                                           fd flags */
 477         #endif
 478
 479         if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 480                 lprintf(1, "Can't bind: %s\n", strerror(errno));
 481                 return (-WC_EXIT_BIND);
 482         }
 483         if (listen(s, queue_len) < 0) {
 484                 lprintf(1, "Can't listen: %s\n", strerror(errno));
 485                 return (-WC_EXIT_BIND);
 486         }
 487         return (s);
 488 }
 489
 490 #else /* CTDL_IPV6 */
 491
 492 /*
 493  * This is a generic function to set up a master socket for listening on
 494  * a TCP port.  The server shuts down if the bind fails.
 495  *
 496  * ip_addr      IP address to bind
 497  * port_number  port number to bind
 498  * queue_len    number of incoming connections to allow in the queue
 499  */
 500 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
 501 {
 502         struct protoent *p;
 503         struct sockaddr_in sin;
 504         int s, i;
 505
 506         memset(&sin, 0, sizeof(sin));
 507         sin.sin_family = AF_INET;
 508         if (ip_addr == NULL) {
 509                 sin.sin_addr.s_addr = INADDR_ANY;
 510         } else {
 511                 sin.sin_addr.s_addr = inet_addr(ip_addr);
 512         }
 513
 514         if (sin.sin_addr.s_addr == INADDR_NONE) {
 515                 sin.sin_addr.s_addr = INADDR_ANY;
 516         }
 517
 518         if (port_number == 0) {
 519                 lprintf(1, "Cannot start: no port number specified.\n");
 520                 return (-WC_EXIT_BIND);
 521         }
 522         sin.sin_port = htons((u_short) port_number);
 523
 524         p = getprotobyname("tcp");
 525
 526         s = socket(PF_INET, SOCK_STREAM, (p->p_proto));
 527         if (s < 0) {
 528                 lprintf(1, "Can't create an IPv4 socket: %s\n", strerror(errno));
 529                 return (-WC_EXIT_BIND);
 530         }
 531         /* Set some socket options that make sense. */
 532         i = 1;
 533         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 534
 535         if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 536                 lprintf(1, "Can't bind: %s\n", strerror(errno));
 537                 return (-WC_EXIT_BIND);
 538         }
 539         if (listen(s, queue_len) < 0) {
 540                 lprintf(1, "Can't listen: %s\n", strerror(errno));
 541                 return (-WC_EXIT_BIND);
 542         }
 543         return (s);
 544 }
 545
 546 #endif /* CTDL_IPV6 */
 547
 548
 549 /*
 550  * Create a Unix domain socket and listen on it
 551  * sockpath - file name of the unix domain socket
 552  * queue_len - Number of incoming connections to allow in the queue
 553  */
 554 int ig_uds_server(char *sockpath, int queue_len)
 555 {
 556         struct sockaddr_un addr;
 557         int s;
 558         int i;
 559         int actual_queue_len;
 560
 561         actual_queue_len = queue_len;
 562         if (actual_queue_len < 5) actual_queue_len = 5;
 563
 564         i = unlink(sockpath);
 565         if ((i != 0) && (errno != ENOENT)) {
 566                 lprintf(1, "webcit: can't unlink %s: %s\n",
 567                         sockpath, strerror(errno));
 568                 return (-WC_EXIT_BIND);
 569         }
 570
 571         memset(&addr, 0, sizeof(addr));
 572         addr.sun_family = AF_UNIX;
 573         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 574
 575         s = socket(AF_UNIX, SOCK_STREAM, 0);
 576         if (s < 0) {
 577                 lprintf(1, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 578                 return (-WC_EXIT_BIND);
 579         }
 580
 581         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 582                 lprintf(1, "webcit: Can't bind: %s\n",
 583                         strerror(errno));
 584                 return (-WC_EXIT_BIND);
 585         }
 586
 587         if (listen(s, actual_queue_len) < 0) {
 588                 lprintf(1, "webcit: Can't listen: %s\n",
 589                         strerror(errno));
 590                 return (-WC_EXIT_BIND);
 591         }
 592
 593         chmod(sockpath, 0777);
 594         return(s);
 595 }
 596
 597
 598
 599
 600 /*
 601  * Read data from the client socket.
 602  *
 603  * sock         socket fd to read from
 604  * buf          buffer to read into
 605  * bytes        number of bytes to read
 606  * timeout      Number of seconds to wait before timing out
 607  *
 608  * Possible return values:
 609  *      1       Requested number of bytes has been read.
 610  *      0       Request timed out.
 611  *      -1      Connection is broken, or other error.
 612  */
 613 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 614 {
 615         const char *Error;
 616         int retval = 0;
 617
 618 #ifdef HAVE_OPENSSL
 619         if (is_https) {
 620                 long bufremain;
 621                 long baselen;
 622
 623                 baselen = StrLength(Target);
 624
 625                 if (Hdr->Pos == NULL)
 626                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 627                 bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 628
 629                 if (bytes < bufremain)
 630                         bufremain = bytes;
 631                 StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 632                 StrBufCutLeft(Hdr->ReadBuf, bufremain);
 633
 634                 if (bytes > bufremain)
 635                 {
 636                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 637                                (retval >= 0))
 638                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 639                         if (retval >= 0) {
 640                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 641 #ifdef HTTP_TRACING
 642                                 write(2, "\033[32m", 5);
 643                                 write(2, buf, bytes);
 644                                 write(2, "\033[30m", 5);
 645 #endif
 646                                 return 1;
 647                         }
 648                         else {
 649                                 lprintf(2, "client_read_ssl() failed\n");
 650                                 return -1;
 651                         }
 652                 }
 653                 else
 654                         return 1;
 655         }
 656 #endif
 657
 658         retval = StrBufReadBLOBBuffered(Target,
 659                                         Hdr->ReadBuf,
 660                                         &Hdr->Pos,
 661                                         &Hdr->http_sock,
 662                                         1,
 663                                         bytes,
 664                                         O_TERM,
 665                                         &Error);
 666         if (retval < 0) {
 667                 lprintf(2, "client_read() failed: %s\n",
 668                         Error);
 669                 wc_backtrace();
 670                 return retval;
 671         }
 672
 673 #ifdef HTTP_TRACING
 674         write(2, "\033[32m", 5);
 675         write(2, buf, bytes);
 676         write(2, "\033[30m", 5);
 677 #endif
 678         return 1;
 679 }
 680
 681
 682 /*
 683  * Begin buffering HTTP output so we can transmit it all in one write operation later.
 684  */
 685 void begin_burst(void)
 686 {
 687         if (WC->WBuf == NULL) {
 688                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 689         }
 690 }
 691
 692
 693 /*
 694  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
 695  */
 696 long end_burst(void)
 697 {
 698         wcsession *WCC = WC;
 699         const char *ptr, *eptr;
 700         long count;
 701         ssize_t res = 0;
 702         fd_set wset;
 703         int fdflags;
 704
 705         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
 706         {
 707                 if (CompressBuffer(WCC->WBuf) > 0)
 708                         hprintf("Content-encoding: gzip\r\n");
 709                 else {
 710                         lprintf(CTDL_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
 711                         wc_backtrace();
 712                 }
 713         }
 714
 715         if (WCC->WFBuf != NULL) {
 716                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
 717                 FreeStrBuf(&WCC->WFBuf);
 718         }
 719
 720         if (WCC->Hdr->HR.prohibit_caching)
 721                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
 722         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
 723
 724         ptr = ChrPtr(WCC->HBuf);
 725         count = StrLength(WCC->HBuf);
 726         eptr = ptr + count;
 727
 728 #ifdef HAVE_OPENSSL
 729         if (is_https) {
 730                 client_write_ssl(WCC->HBuf);
 731                 client_write_ssl(WCC->WBuf);
 732                 return (count);
 733         }
 734 #endif
 735
 736
 737 #ifdef HTTP_TRACING
 738
 739         write(2, "\033[34m", 5);
 740         write(2, ptr, StrLength(WCC->WBuf));
 741         write(2, "\033[30m", 5);
 742 #endif
 743         if (WCC->Hdr->http_sock == -1)
 744                 return -1;
 745         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 746
 747         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
 748                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 749                         FD_ZERO(&wset);
 750                         FD_SET(WCC->Hdr->http_sock, &wset);
 751                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 752                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 753                                 return -1;
 754                         }
 755                 }
 756
 757                 if ((WCC->Hdr->http_sock == -1) ||
 758                     (res = write(WCC->Hdr->http_sock,
 759                                  ptr,
 760                                  count)) == -1) {
 761                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 762                         wc_backtrace();
 763                         return res;
 764                 }
 765                 count -= res;
 766                 ptr += res;
 767         }
 768
 769         ptr = ChrPtr(WCC->WBuf);
 770         count = StrLength(WCC->WBuf);
 771         eptr = ptr + count;
 772
 773 #ifdef HTTP_TRACING
 774
 775         write(2, "\033[34m", 5);
 776         write(2, ptr, StrLength(WCC->WBuf));
 777         write(2, "\033[30m", 5);
 778 #endif
 779
 780         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
 781                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 782                         FD_ZERO(&wset);
 783                         FD_SET(WCC->Hdr->http_sock, &wset);
 784                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 785                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 786                                 return -1;
 787                         }
 788                 }
 789
 790                 if ((WCC->Hdr->http_sock == -1) ||
 791                     (res = write(WCC->Hdr->http_sock,
 792                                  ptr,
 793                                  count)) == -1) {
 794                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 795                         wc_backtrace();
 796                         return res;
 797                 }
 798                 count -= res;
 799                 ptr += res;
 800         }
 801
 802         return StrLength(WCC->WBuf);
 803 }
 804
 805
 806 /*
 807  * lingering_close() a`la Apache. see
 808  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
 809  */
 810 int lingering_close(int fd)
 811 {
 812         char buf[SIZ];
 813         int i;
 814         fd_set set;
 815         struct timeval tv, start;
 816
 817         gettimeofday(&start, NULL);
 818         if (fd == -1)
 819                 return -1;
 820         shutdown(fd, 1);
 821         do {
 822                 do {
 823                         gettimeofday(&tv, NULL);
 824                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
 825                         tv.tv_usec = start.tv_usec - tv.tv_usec;
 826                         if (tv.tv_usec < 0) {
 827                                 tv.tv_sec--;
 828                                 tv.tv_usec += 1000000;
 829                         }
 830                         FD_ZERO(&set);
 831                         FD_SET(fd, &set);
 832                         i = select(fd + 1, &set, NULL, NULL, &tv);
 833                 } while (i == -1 && errno == EINTR);
 834
 835                 if (i <= 0)
 836                         break;
 837
 838                 i = read(fd, buf, sizeof buf);
 839         } while (i != 0 && (i != -1 || errno == EINTR));
 840
 841         return close(fd);
 842 }
 843
 844 void
 845 HttpNewModule_TCPSOCKETS
 846 (ParsedHttpHdrs *httpreq)
 847 {
 848
 849         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
 850 }
 851
 852 void
 853 HttpDetachModule_TCPSOCKETS
 854 (ParsedHttpHdrs *httpreq)
 855 {
 856
 857         FlushStrBuf(httpreq->ReadBuf);
 858         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
 859 }
 860
 861 void
 862 HttpDestroyModule_TCPSOCKETS
 863 (ParsedHttpHdrs *httpreq)
 864 {
 865
 866         FreeStrBuf(&httpreq->ReadBuf);
 867 }
 868
 869
 870 void
 871 SessionNewModule_TCPSOCKETS
 872 (wcsession *sess)
 873 {
 874         sess->CLineBuf = NewStrBuf();
 875         sess->MigrateReadLineBuf = NewStrBuf();
 876 }
 877
 878 void
 879 SessionDestroyModule_TCPSOCKETS
 880 (wcsession *sess)
 881 {
 882         FreeStrBuf(&sess->CLineBuf);
 883         FreeStrBuf(&sess->ReadBuf);
 884         sess->ReadPos = NULL;
 885         FreeStrBuf(&sess->MigrateReadLineBuf);
 886         if (sess->serv_sock > 0)
 887                 close(sess->serv_sock);
 888 }