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 "SIZE_T_FMT"|"SIZE_T_FMT, bytes_read, total_len-bytes_read);
 336                 if ( (rc = StrBuf_ServGetln(Buf) > 0) && (GetServerStatus(Buf, NULL) == 6) )
 337                 {
 338                         if (rc < 0)
 339                                 return rc;
 340                         StrBufCutLeft(Buf, 4);
 341                         this_block = StrTol(Buf);
 342                         rc = StrBuf_ServGetBLOBBuffered(Ret, this_block);
 343                         if (rc < 0) {
 344                                 lprintf(1, "Server connection broken during download\n");
 345                                 wc_backtrace();
 346                                 WCC->serv_sock = (-1);
 347                                 WCC->connected = 0;
 348                                 WCC->logged_in = 0;
 349                                 return rc;
 350                         }
 351                         bytes_read += rc;
 352                 }
 353         }
 354
 355         return StrLength(Ret);
 356 }
 357
 358
 359 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 360 {
 361         const char *Error;
 362 #ifdef HAVE_OPENSSL
 363         const char *pch, *pchs;
 364         int rlen, len, retval = 0;
 365
 366         if (is_https) {
 367                 int ntries = 0;
 368                 if (StrLength(Hdr->ReadBuf) > 0) {
 369                         pchs = ChrPtr(Hdr->ReadBuf);
 370                         pch = strchr(pchs, '\n');
 371                         if (pch != NULL) {
 372                                 rlen = 0;
 373                                 len = pch - pchs;
 374                                 if (len > 0 && (*(pch - 1) == '\r') )
 375                                         rlen ++;
 376                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 377                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 378                                 return len - rlen;
 379                         }
 380                 }
 381
 382                 while (retval == 0) {
 383                                 pch = NULL;
 384                                 pchs = ChrPtr(Hdr->ReadBuf);
 385                                 if (*pchs != '\0')
 386                                         pch = strchr(pchs, '\n');
 387                                 if (pch == NULL) {
 388                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 389                                         pchs = ChrPtr(Hdr->ReadBuf);
 390                                         pch = strchr(pchs, '\n');
 391                                 }
 392                                 if (retval == 0) {
 393                                         sleeeeeeeeeep(1);
 394                                         ntries ++;
 395                                 }
 396                                 if (ntries > 10)
 397                                         return 0;
 398                 }
 399                 if ((retval > 0) && (pch != NULL)) {
 400                         rlen = 0;
 401                         len = pch - pchs;
 402                         if (len > 0 && (*(pch - 1) == '\r') )
 403                                 rlen ++;
 404                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 405                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 406                         return len - rlen;
 407
 408                 }
 409                 else
 410                         return -1;
 411         }
 412         else
 413 #endif
 414                 return StrBufTCP_read_buffered_line_fast(Target,
 415                                                          Hdr->ReadBuf,
 416                                                          &Hdr->Pos,
 417                                                          &Hdr->http_sock,
 418                                                          5,
 419                                                          1,
 420                                                          &Error);
 421 }
 422
 423 #ifdef CTDL_IPV6
 424
 425 /*
 426  * This is a generic function to set up a master socket for listening on
 427  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 428  *
 429  * ip_addr      IP address to bind
 430  * port_number  port number to bind
 431  * queue_len    number of incoming connections to allow in the queue
 432  */
 433 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
 434 {
 435         struct protoent *p;
 436         struct sockaddr_in6 sin;
 437         int s, i;
 438
 439         memset(&sin, 0, sizeof(sin));
 440         sin.sin6_family = AF_INET6;
 441
 442         if ((ip_addr == NULL) || (IsEmptyStr(ip_addr)) || (!strcmp(ip_addr, "0.0.0.0"))) {
 443                 sin.sin6_addr = in6addr_any;
 444         } else {
 445                 char bind_to[256];
 446                 if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':'))) {
 447                         snprintf(bind_to, sizeof bind_to, "::ffff:%s", ip_addr);
 448                 }
 449                 else {
 450                         safestrncpy(bind_to, ip_addr, sizeof bind_to);
 451                 }
 452                 if (inet_pton(AF_INET6, bind_to, &sin.sin6_addr) <= 0) {
 453                         lprintf(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 454                         return (-WC_EXIT_BIND);
 455                 }
 456         }
 457
 458         if (port_number == 0) {
 459                 lprintf(1, "Cannot start: no port number specified.\n");
 460                 return (-WC_EXIT_BIND);
 461         }
 462         sin.sin6_port = htons((u_short) port_number);
 463
 464         p = getprotobyname("tcp");
 465
 466         s = socket(PF_INET6, SOCK_STREAM, (p->p_proto));
 467         if (s < 0) {
 468                 lprintf(1, "Can't create an IPv6 socket: %s\n", strerror(errno));
 469                 return (-WC_EXIT_BIND);
 470         }
 471         /* Set some socket options that make sense. */
 472         i = 1;
 473         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 474
 475         #ifndef __APPLE__
 476         fcntl(s, F_SETFL, O_NONBLOCK); /* maide: this statement is incorrect
 477                                           there should be a preceding F_GETFL
 478                                           and a bitwise OR with the previous
 479                                           fd flags */
 480         #endif
 481
 482         if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 483                 lprintf(1, "Can't bind: %s\n", strerror(errno));
 484                 return (-WC_EXIT_BIND);
 485         }
 486         if (listen(s, queue_len) < 0) {
 487                 lprintf(1, "Can't listen: %s\n", strerror(errno));
 488                 return (-WC_EXIT_BIND);
 489         }
 490         return (s);
 491 }
 492
 493 #else /* CTDL_IPV6 */
 494
 495 /*
 496  * This is a generic function to set up a master socket for listening on
 497  * a TCP port.  The server shuts down if the bind fails.
 498  *
 499  * ip_addr      IP address to bind
 500  * port_number  port number to bind
 501  * queue_len    number of incoming connections to allow in the queue
 502  */
 503 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
 504 {
 505         struct protoent *p;
 506         struct sockaddr_in sin;
 507         int s, i;
 508
 509         memset(&sin, 0, sizeof(sin));
 510         sin.sin_family = AF_INET;
 511         if (ip_addr == NULL) {
 512                 sin.sin_addr.s_addr = INADDR_ANY;
 513         } else {
 514                 sin.sin_addr.s_addr = inet_addr(ip_addr);
 515         }
 516
 517         if (sin.sin_addr.s_addr == INADDR_NONE) {
 518                 sin.sin_addr.s_addr = INADDR_ANY;
 519         }
 520
 521         if (port_number == 0) {
 522                 lprintf(1, "Cannot start: no port number specified.\n");
 523                 return (-WC_EXIT_BIND);
 524         }
 525         sin.sin_port = htons((u_short) port_number);
 526
 527         p = getprotobyname("tcp");
 528
 529         s = socket(PF_INET, SOCK_STREAM, (p->p_proto));
 530         if (s < 0) {
 531                 lprintf(1, "Can't create an IPv4 socket: %s\n", strerror(errno));
 532                 return (-WC_EXIT_BIND);
 533         }
 534         /* Set some socket options that make sense. */
 535         i = 1;
 536         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 537
 538         if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 539                 lprintf(1, "Can't bind: %s\n", strerror(errno));
 540                 return (-WC_EXIT_BIND);
 541         }
 542         if (listen(s, queue_len) < 0) {
 543                 lprintf(1, "Can't listen: %s\n", strerror(errno));
 544                 return (-WC_EXIT_BIND);
 545         }
 546         return (s);
 547 }
 548
 549 #endif /* CTDL_IPV6 */
 550
 551
 552 /*
 553  * Create a Unix domain socket and listen on it
 554  * sockpath - file name of the unix domain socket
 555  * queue_len - Number of incoming connections to allow in the queue
 556  */
 557 int ig_uds_server(char *sockpath, int queue_len)
 558 {
 559         struct sockaddr_un addr;
 560         int s;
 561         int i;
 562         int actual_queue_len;
 563
 564         actual_queue_len = queue_len;
 565         if (actual_queue_len < 5) actual_queue_len = 5;
 566
 567         i = unlink(sockpath);
 568         if ((i != 0) && (errno != ENOENT)) {
 569                 lprintf(1, "webcit: can't unlink %s: %s\n",
 570                         sockpath, strerror(errno));
 571                 return (-WC_EXIT_BIND);
 572         }
 573
 574         memset(&addr, 0, sizeof(addr));
 575         addr.sun_family = AF_UNIX;
 576         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 577
 578         s = socket(AF_UNIX, SOCK_STREAM, 0);
 579         if (s < 0) {
 580                 lprintf(1, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 581                 return (-WC_EXIT_BIND);
 582         }
 583
 584         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 585                 lprintf(1, "webcit: Can't bind: %s\n",
 586                         strerror(errno));
 587                 return (-WC_EXIT_BIND);
 588         }
 589
 590         if (listen(s, actual_queue_len) < 0) {
 591                 lprintf(1, "webcit: Can't listen: %s\n",
 592                         strerror(errno));
 593                 return (-WC_EXIT_BIND);
 594         }
 595
 596         chmod(sockpath, 0777);
 597         return(s);
 598 }
 599
 600
 601
 602
 603 /*
 604  * Read data from the client socket.
 605  *
 606  * sock         socket fd to read from
 607  * buf          buffer to read into
 608  * bytes        number of bytes to read
 609  * timeout      Number of seconds to wait before timing out
 610  *
 611  * Possible return values:
 612  *      1       Requested number of bytes has been read.
 613  *      0       Request timed out.
 614  *      -1      Connection is broken, or other error.
 615  */
 616 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 617 {
 618         const char *Error;
 619         int retval = 0;
 620
 621 #ifdef HAVE_OPENSSL
 622         if (is_https) {
 623                 long bufremain;
 624                 long baselen;
 625
 626                 baselen = StrLength(Target);
 627
 628                 if (Hdr->Pos == NULL)
 629                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 630                 bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 631
 632                 if (bytes < bufremain)
 633                         bufremain = bytes;
 634                 StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 635                 StrBufCutLeft(Hdr->ReadBuf, bufremain);
 636
 637                 if (bytes > bufremain)
 638                 {
 639                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 640                                (retval >= 0))
 641                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 642                         if (retval >= 0) {
 643                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 644 #ifdef HTTP_TRACING
 645                                 write(2, "\033[32m", 5);
 646                                 write(2, buf, bytes);
 647                                 write(2, "\033[30m", 5);
 648 #endif
 649                                 return 1;
 650                         }
 651                         else {
 652                                 lprintf(2, "client_read_ssl() failed\n");
 653                                 return -1;
 654                         }
 655                 }
 656                 else
 657                         return 1;
 658         }
 659 #endif
 660
 661         retval = StrBufReadBLOBBuffered(Target,
 662                                         Hdr->ReadBuf,
 663                                         &Hdr->Pos,
 664                                         &Hdr->http_sock,
 665                                         1,
 666                                         bytes,
 667                                         O_TERM,
 668                                         &Error);
 669         if (retval < 0) {
 670                 lprintf(2, "client_read() failed: %s\n",
 671                         Error);
 672                 wc_backtrace();
 673                 return retval;
 674         }
 675
 676 #ifdef HTTP_TRACING
 677         write(2, "\033[32m", 5);
 678         write(2, buf, bytes);
 679         write(2, "\033[30m", 5);
 680 #endif
 681         return 1;
 682 }
 683
 684
 685 /*
 686  * Begin buffering HTTP output so we can transmit it all in one write operation later.
 687  */
 688 void begin_burst(void)
 689 {
 690         if (WC->WBuf == NULL) {
 691                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 692         }
 693 }
 694
 695
 696 /*
 697  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
 698  */
 699 long end_burst(void)
 700 {
 701         wcsession *WCC = WC;
 702         const char *ptr, *eptr;
 703         long count;
 704         ssize_t res = 0;
 705         fd_set wset;
 706         int fdflags;
 707
 708         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
 709         {
 710                 if (CompressBuffer(WCC->WBuf) > 0)
 711                         hprintf("Content-encoding: gzip\r\n");
 712                 else {
 713                         lprintf(CTDL_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
 714                         wc_backtrace();
 715                 }
 716         }
 717
 718         if (WCC->WFBuf != NULL) {
 719                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
 720                 FreeStrBuf(&WCC->WFBuf);
 721         }
 722
 723         if (WCC->Hdr->HR.prohibit_caching)
 724                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
 725         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
 726
 727         ptr = ChrPtr(WCC->HBuf);
 728         count = StrLength(WCC->HBuf);
 729         eptr = ptr + count;
 730
 731 #ifdef HAVE_OPENSSL
 732         if (is_https) {
 733                 client_write_ssl(WCC->HBuf);
 734                 client_write_ssl(WCC->WBuf);
 735                 return (count);
 736         }
 737 #endif
 738
 739
 740 #ifdef HTTP_TRACING
 741
 742         write(2, "\033[34m", 5);
 743         write(2, ptr, StrLength(WCC->WBuf));
 744         write(2, "\033[30m", 5);
 745 #endif
 746         if (WCC->Hdr->http_sock == -1)
 747                 return -1;
 748         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 749
 750         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
 751                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 752                         FD_ZERO(&wset);
 753                         FD_SET(WCC->Hdr->http_sock, &wset);
 754                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 755                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 756                                 return -1;
 757                         }
 758                 }
 759
 760                 if ((WCC->Hdr->http_sock == -1) ||
 761                     (res = write(WCC->Hdr->http_sock,
 762                                  ptr,
 763                                  count)) == -1) {
 764                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 765                         wc_backtrace();
 766                         return res;
 767                 }
 768                 count -= res;
 769                 ptr += res;
 770         }
 771
 772         ptr = ChrPtr(WCC->WBuf);
 773         count = StrLength(WCC->WBuf);
 774         eptr = ptr + count;
 775
 776 #ifdef HTTP_TRACING
 777
 778         write(2, "\033[34m", 5);
 779         write(2, ptr, StrLength(WCC->WBuf));
 780         write(2, "\033[30m", 5);
 781 #endif
 782
 783         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
 784                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 785                         FD_ZERO(&wset);
 786                         FD_SET(WCC->Hdr->http_sock, &wset);
 787                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 788                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 789                                 return -1;
 790                         }
 791                 }
 792
 793                 if ((WCC->Hdr->http_sock == -1) ||
 794                     (res = write(WCC->Hdr->http_sock,
 795                                  ptr,
 796                                  count)) == -1) {
 797                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 798                         wc_backtrace();
 799                         return res;
 800                 }
 801                 count -= res;
 802                 ptr += res;
 803         }
 804
 805         return StrLength(WCC->WBuf);
 806 }
 807
 808
 809 /*
 810  * lingering_close() a`la Apache. see
 811  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
 812  */
 813 int lingering_close(int fd)
 814 {
 815         char buf[SIZ];
 816         int i;
 817         fd_set set;
 818         struct timeval tv, start;
 819
 820         gettimeofday(&start, NULL);
 821         if (fd == -1)
 822                 return -1;
 823         shutdown(fd, 1);
 824         do {
 825                 do {
 826                         gettimeofday(&tv, NULL);
 827                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
 828                         tv.tv_usec = start.tv_usec - tv.tv_usec;
 829                         if (tv.tv_usec < 0) {
 830                                 tv.tv_sec--;
 831                                 tv.tv_usec += 1000000;
 832                         }
 833                         FD_ZERO(&set);
 834                         FD_SET(fd, &set);
 835                         i = select(fd + 1, &set, NULL, NULL, &tv);
 836                 } while (i == -1 && errno == EINTR);
 837
 838                 if (i <= 0)
 839                         break;
 840
 841                 i = read(fd, buf, sizeof buf);
 842         } while (i != 0 && (i != -1 || errno == EINTR));
 843
 844         return close(fd);
 845 }
 846
 847 void
 848 HttpNewModule_TCPSOCKETS
 849 (ParsedHttpHdrs *httpreq)
 850 {
 851
 852         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
 853 }
 854
 855 void
 856 HttpDetachModule_TCPSOCKETS
 857 (ParsedHttpHdrs *httpreq)
 858 {
 859
 860         FlushStrBuf(httpreq->ReadBuf);
 861         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
 862 }
 863
 864 void
 865 HttpDestroyModule_TCPSOCKETS
 866 (ParsedHttpHdrs *httpreq)
 867 {
 868
 869         FreeStrBuf(&httpreq->ReadBuf);
 870 }
 871
 872
 873 void
 874 SessionNewModule_TCPSOCKETS
 875 (wcsession *sess)
 876 {
 877         sess->CLineBuf = NewStrBuf();
 878         sess->MigrateReadLineBuf = NewStrBuf();
 879 }
 880
 881 void
 882 SessionDestroyModule_TCPSOCKETS
 883 (wcsession *sess)
 884 {
 885         FreeStrBuf(&sess->CLineBuf);
 886         FreeStrBuf(&sess->ReadBuf);
 887         sess->ReadPos = NULL;
 888         FreeStrBuf(&sess->MigrateReadLineBuf);
 889         if (sess->serv_sock > 0)
 890                 close(sess->serv_sock);
 891 }