webcit/tcp_sockets.c

   1 /*
   2  * $Id$
   3  *
   4  * Copyright (c) 1987-2010 by the citadel.org team
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 /*
  22  * Uncomment this to log all communications with the Citadel server
  23 #define SERV_TRACE 1
  24  */
  25
  26
  27 #include "webcit.h"
  28 #include "webserver.h"
  29
  30 extern int DisableGzip;
  31 long MaxRead = -1; /* should we do READ scattered or all at once? */
  32
  33 /*
  34  * register the timeout
  35  */
  36 RETSIGTYPE timeout(int signum)
  37 {
  38         lprintf(1, "Connection timed out; unable to reach citserver\n");
  39         /* no exit here, since we need to server the connection unreachable thing. exit(3); */
  40 }
  41
  42
  43 /*
  44  *  Connect a unix domain socket
  45  *  sockpath where to open a unix domain socket
  46  */
  47 int uds_connectsock(char *sockpath)
  48 {
  49         struct sockaddr_un addr;
  50         int s;
  51
  52         memset(&addr, 0, sizeof(addr));
  53         addr.sun_family = AF_UNIX;
  54         strncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
  55
  56         s = socket(AF_UNIX, SOCK_STREAM, 0);
  57         if (s < 0) {
  58                 lprintf(1, "Can't create socket[%s]: %s\n",
  59                         sockpath,
  60                         strerror(errno));
  61                 return(-1);
  62         }
  63
  64         if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
  65                 lprintf(1, "Can't connect [%s]: %s\n",
  66                         sockpath,
  67                         strerror(errno));
  68                 close(s);
  69                 return(-1);
  70         }
  71
  72         return s;
  73 }
  74
  75
  76 /*
  77  *  Connect a TCP/IP socket
  78  *  host the host to connect to
  79  *  service the service on the host to call
  80  */
  81 int tcp_connectsock(char *host, char *service)
  82 {
  83         int fdflags;
  84         struct hostent *phe;
  85         struct servent *pse;
  86         struct protoent *ppe;
  87         struct sockaddr_in sin;
  88         int s;
  89
  90         memset(&sin, 0, sizeof(sin));
  91         sin.sin_family = AF_INET;
  92
  93         pse = getservbyname(service, "tcp");
  94         if (pse) {
  95                 sin.sin_port = pse->s_port;
  96         } else if ((sin.sin_port = htons((u_short) atoi(service))) == 0) {
  97                 lprintf(1, "Can't get %s service entry\n", service);
  98                 return (-1);
  99         }
 100         phe = gethostbyname(host);
 101         if (phe) {
 102                 memcpy(&sin.sin_addr, phe->h_addr, phe->h_length);
 103         } else if ((sin.sin_addr.s_addr = inet_addr(host)) == INADDR_NONE) {
 104                 lprintf(1, "Can't get %s host entry: %s\n",
 105                         host, strerror(errno));
 106                 return (-1);
 107         }
 108         if ((ppe = getprotobyname("tcp")) == 0) {
 109                 lprintf(1, "Can't get TCP protocol entry: %s\n",
 110                         strerror(errno));
 111                 return (-1);
 112         }
 113
 114         s = socket(PF_INET, SOCK_STREAM, ppe->p_proto);
 115         if (s < 0) {
 116                 lprintf(1, "Can't create socket: %s\n", strerror(errno));
 117                 return (-1);
 118         }
 119
 120         fdflags = fcntl(s, F_GETFL);
 121         if (fdflags < 0)
 122                 lprintf(1, "unable to get socket flags!  %s.%s: %s \n",
 123                         host, service, strerror(errno));
 124         fdflags = fdflags | O_NONBLOCK;
 125         if (fcntl(s, F_SETFD, fdflags) < 0)
 126                 lprintf(1, "unable to set socket nonblocking flags!  %s.%s: %s \n",
 127                         host, service, strerror(errno));
 128
 129         signal(SIGALRM, timeout);
 130         alarm(30);
 131
 132         if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 133                 lprintf(1, "Can't connect to %s.%s: %s\n",
 134                         host, service, strerror(errno));
 135                 close(s);
 136                 return (-1);
 137         }
 138         alarm(0);
 139         signal(SIGALRM, SIG_IGN);
 140         if (!is_https) {
 141                 fdflags = fcntl(s, F_GETFL);
 142                 if (fdflags < 0)
 143                         lprintf(1, "unable to get socket flags!  %s.%s: %s \n",
 144                                 host, service, strerror(errno));
 145                 fdflags = fdflags | O_NONBLOCK;
 146                 if (fcntl(s, F_SETFD, fdflags) < 0)
 147                         lprintf(1, "unable to set socket nonblocking flags!  %s.%s: %s \n",
 148                                 host, service, strerror(errno));
 149         }
 150         return (s);
 151 }
 152
 153
 154
 155 /*
 156  *  input string from pipe
 157  */
 158 int serv_getln(char *strbuf, int bufsize)
 159 {
 160         wcsession *WCC = WC;
 161         int len;
 162
 163         *strbuf = '\0';
 164         StrBuf_ServGetln(WCC->MigrateReadLineBuf);
 165         len = StrLength(WCC->MigrateReadLineBuf);
 166         if (len > bufsize)
 167                 len = bufsize - 1;
 168         memcpy(strbuf, ChrPtr(WCC->MigrateReadLineBuf), len);
 169         FlushStrBuf(WCC->MigrateReadLineBuf);
 170         strbuf[len] = '\0';
 171 #ifdef SERV_TRACE
 172         lprintf(9, "%3d<<<%s\n", WC->serv_sock, strbuf);
 173 #endif
 174         return len;
 175 }
 176
 177
 178 int StrBuf_ServGetln(StrBuf *buf)
 179 {
 180         wcsession *WCC = WC;
 181         const char *ErrStr = NULL;
 182         int rc;
 183
 184         FlushStrBuf(buf);
 185         rc = StrBufTCP_read_buffered_line_fast(buf,
 186                                                WCC->ReadBuf,
 187                                                &WCC->ReadPos,
 188                                                &WCC->serv_sock,
 189                                                5, 1,
 190                                                &ErrStr);
 191         if (rc < 0)
 192         {
 193                 lprintf(1, "Server connection broken: %s\n",
 194                         (ErrStr)?ErrStr:"");
 195                 wc_backtrace();
 196                 WCC->serv_sock = (-1);
 197                 WCC->connected = 0;
 198                 WCC->logged_in = 0;
 199         }
 200 #ifdef SERV_TRACE
 201         else
 202         {
 203                 long pos=0;
 204                 if (WCC->ReadPos != NULL)
 205                         pos = WCC->ReadPos - ChrPtr(buf);
 206                 lprintf(9, "%3d<<<[%ld]%s\n", WC->serv_sock, pos, ChrPtr(buf));
 207         }
 208 #endif
 209         return rc;
 210 }
 211
 212 int StrBuf_ServGetBLOBBuffered(StrBuf *buf, long BlobSize)
 213 {
 214         wcsession *WCC = WC;
 215         const char *ErrStr;
 216         int rc;
 217
 218         rc = StrBufReadBLOBBuffered(buf,
 219                                     WCC->ReadBuf,
 220                                     &WCC->ReadPos,
 221                                     &WCC->serv_sock,
 222                                     1,
 223                                     BlobSize,
 224                                     NNN_TERM,
 225                                     &ErrStr);
 226         if (rc < 0)
 227         {
 228                 lprintf(1, "Server connection broken: %s\n",
 229                         (ErrStr)?ErrStr:"");
 230                 wc_backtrace();
 231                 WCC->serv_sock = (-1);
 232                 WCC->connected = 0;
 233                 WCC->logged_in = 0;
 234         }
 235 #ifdef SERV_TRACE
 236         else
 237                 lprintf(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 238 #endif
 239
 240         return rc;
 241 }
 242
 243 int StrBuf_ServGetBLOB(StrBuf *buf, long BlobSize)
 244 {
 245         wcsession *WCC = WC;
 246         const char *ErrStr;
 247         int rc;
 248
 249         WCC->ReadPos = NULL;
 250         rc = StrBufReadBLOB(buf, &WCC->serv_sock, 1, BlobSize, &ErrStr);
 251         if (rc < 0)
 252         {
 253                 lprintf(1, "Server connection broken: %s\n",
 254                         (ErrStr)?ErrStr:"");
 255                 wc_backtrace();
 256                 WCC->serv_sock = (-1);
 257                 WCC->connected = 0;
 258                 WCC->logged_in = 0;
 259         }
 260 #ifdef SERV_TRACE
 261         else
 262                 lprintf(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 263 #endif
 264
 265         return rc;
 266 }
 267
 268 /*
 269  *  send binary to server
 270  *  buf the buffer to write to citadel server
 271  *  nbytes how many bytes to send to citadel server
 272  */
 273 void serv_write(const char *buf, int nbytes)
 274 {
 275         wcsession *WCC = WC;
 276         int bytes_written = 0;
 277         int retval;
 278
 279         FlushStrBuf(WCC->ReadBuf);
 280         WCC->ReadPos = NULL;
 281         while (bytes_written < nbytes) {
 282                 retval = write(WCC->serv_sock, &buf[bytes_written],
 283                                nbytes - bytes_written);
 284                 if (retval < 1) {
 285                         const char *ErrStr = strerror(errno);
 286                         lprintf(1, "Server connection broken: %s\n",
 287                                 (ErrStr)?ErrStr:"");
 288                         close(WCC->serv_sock);
 289                         WCC->serv_sock = (-1);
 290                         WCC->connected = 0;
 291                         WCC->logged_in = 0;
 292                         return;
 293                 }
 294                 bytes_written = bytes_written + retval;
 295         }
 296 }
 297
 298
 299 /*
 300  *  send line to server
 301  *  string the line to send to the citadel server
 302  */
 303 void serv_puts(const char *string)
 304 {
 305         wcsession *WCC = WC;
 306 #ifdef SERV_TRACE
 307         lprintf(9, "%3d>>>%s\n", WC->serv_sock, string);
 308 #endif
 309         FlushStrBuf(WCC->ReadBuf);
 310         WCC->ReadPos = NULL;
 311
 312         serv_write(string, strlen(string));
 313         serv_write("\n", 1);
 314 }
 315
 316 /*
 317  *  send line to server
 318  *  string the line to send to the citadel server
 319  */
 320 void serv_putbuf(const StrBuf *string)
 321 {
 322         wcsession *WCC = WC;
 323 #ifdef SERV_TRACE
 324         lprintf(9, "%3d>>>%s\n", WC->serv_sock, ChrPtr(string));
 325 #endif
 326         FlushStrBuf(WCC->ReadBuf);
 327         WCC->ReadPos = NULL;
 328
 329         serv_write(ChrPtr(string), StrLength(string));
 330         serv_write("\n", 1);
 331 }
 332
 333
 334 /*
 335  *  convenience function to send stuff to the server
 336  *  format the formatstring
 337  *  ... the entities to insert into format
 338  */
 339 void serv_printf(const char *format,...)
 340 {
 341         wcsession *WCC = WC;
 342         va_list arg_ptr;
 343         char buf[SIZ];
 344         size_t len;
 345
 346         FlushStrBuf(WCC->ReadBuf);
 347         WCC->ReadPos = NULL;
 348
 349         va_start(arg_ptr, format);
 350         vsnprintf(buf, sizeof buf, format, arg_ptr);
 351         va_end(arg_ptr);
 352
 353         len = strlen(buf);
 354         buf[len++] = '\n';
 355         buf[len] = '\0';
 356         serv_write(buf, len);
 357 #ifdef SERV_TRACE
 358         lprintf(9, ">>>%s", buf);
 359 #endif
 360 }
 361
 362
 363
 364 /**
 365  * Read binary data from server into memory using a series of
 366  * server READ commands.
 367  * \return the read content as StrBuf
 368  */
 369 int serv_read_binary(StrBuf *Ret, size_t total_len, StrBuf *Buf)
 370 {
 371         wcsession *WCC = WC;
 372         size_t bytes = 0;
 373         size_t thisblock = 0;
 374
 375         if (Ret == NULL)
 376             return -1;
 377
 378         if (MaxRead == -1)
 379         {
 380                 serv_printf("READ %d|%d", 0, total_len);
 381                 if (StrBuf_ServGetln(Buf) > 0)
 382                 {
 383                         long YetRead;
 384                         const char *ErrStr;
 385                         const char *pch;
 386                         int rc;
 387
 388                         if (GetServerStatus(Buf, NULL) == 6)
 389                         {
 390                             StrBufCutLeft(Buf, 4);
 391                             thisblock = StrTol(Buf);
 392                             if (WCC->serv_sock==-1) {
 393                                     FlushStrBuf(Ret);
 394                                     return -1;
 395                             }
 396
 397                             pch = ChrPtr(WCC->ReadBuf);
 398                             YetRead = WCC->ReadPos - pch;
 399                             if (YetRead > 0)
 400                             {
 401                                     long StillThere;
 402
 403                                     StillThere = StrLength(WCC->ReadBuf) -
 404                                             YetRead;
 405
 406                                     StrBufPlain(Ret,
 407                                                 WCC->ReadPos,
 408                                                 StillThere);
 409                                     total_len -= StillThere;
 410                             }
 411                             FlushStrBuf(WCC->ReadBuf);
 412                             WCC->ReadPos = NULL;
 413
 414                             if (total_len > 0)
 415                             {
 416                                     rc = StrBufReadBLOB(Ret,
 417                                                         &WCC->serv_sock,
 418                                                         1,
 419                                                         total_len,
 420                                                         &ErrStr);
 421                                     if (rc < 0)
 422                                     {
 423                                             lprintf(1, "Server connection broken: %s\n",
 424                                                     (ErrStr)?ErrStr:"");
 425                                             wc_backtrace();
 426                                             WCC->serv_sock = (-1);
 427                                             WCC->connected = 0;
 428                                             WCC->logged_in = 0;
 429                                             return rc;
 430                                     }
 431                                     else
 432                                             return StrLength(Ret);
 433                             }
 434                             else
 435                                     return StrLength(Ret);
 436                         }
 437                 }
 438                 else
 439                         return -1;
 440         }
 441         else while ((WCC->serv_sock!=-1) &&
 442                (bytes < total_len)) {
 443                 thisblock = MaxRead;
 444                 if ((total_len - bytes) < thisblock) {
 445                         thisblock = total_len - bytes;
 446                         if (thisblock == 0) {
 447                                 FlushStrBuf(Ret);
 448                                 return -1;
 449                         }
 450                 }
 451                 serv_printf("READ %d|%d", (int)bytes, (int)thisblock);
 452                 if (StrBuf_ServGetln(Buf) > 0)
 453                 {
 454                         if (GetServerStatus(Buf, NULL) == 6)
 455                         {
 456                             StrBufCutLeft(Buf, 4);
 457                             thisblock = StrTol(Buf);
 458                             if (WCC->serv_sock==-1) {
 459                                     FlushStrBuf(Ret);
 460                                     return -1;
 461                             }
 462                             StrBuf_ServGetBLOBBuffered(Ret, thisblock);
 463                             bytes += thisblock;
 464                     }
 465                     else {
 466                             lprintf(3, "Error: %s\n", ChrPtr(Buf) + 4);
 467                             return -1;
 468                     }
 469                 }
 470         }
 471         return StrLength(Ret);
 472 }
 473
 474
 475 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 476 {
 477         const char *Error;
 478 #ifdef HAVE_OPENSSL
 479         const char *pch, *pchs;
 480         int rlen, len, retval = 0;
 481
 482         if (is_https) {
 483                 int ntries = 0;
 484                 if (StrLength(Hdr->ReadBuf) > 0) {
 485                         pchs = ChrPtr(Hdr->ReadBuf);
 486                         pch = strchr(pchs, '\n');
 487                         if (pch != NULL) {
 488                                 rlen = 0;
 489                                 len = pch - pchs;
 490                                 if (len > 0 && (*(pch - 1) == '\r') )
 491                                         rlen ++;
 492                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 493                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 494                                 return len - rlen;
 495                         }
 496                 }
 497
 498                 while (retval == 0) {
 499                                 pch = NULL;
 500                                 pchs = ChrPtr(Hdr->ReadBuf);
 501                                 if (*pchs != '\0')
 502                                         pch = strchr(pchs, '\n');
 503                                 if (pch == NULL) {
 504                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 505                                         pchs = ChrPtr(Hdr->ReadBuf);
 506                                         pch = strchr(pchs, '\n');
 507                                 }
 508                                 if (retval == 0) {
 509                                         sleeeeeeeeeep(1);
 510                                         ntries ++;
 511                                 }
 512                                 if (ntries > 10)
 513                                         return 0;
 514                 }
 515                 if ((retval > 0) && (pch != NULL)) {
 516                         rlen = 0;
 517                         len = pch - pchs;
 518                         if (len > 0 && (*(pch - 1) == '\r') )
 519                                 rlen ++;
 520                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 521                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 522                         return len - rlen;
 523
 524                 }
 525                 else
 526                         return -1;
 527         }
 528         else
 529 #endif
 530                 return StrBufTCP_read_buffered_line_fast(Target,
 531                                                          Hdr->ReadBuf,
 532                                                          &Hdr->Pos,
 533                                                          &Hdr->http_sock,
 534                                                          5,
 535                                                          1,
 536                                                          &Error);
 537 }
 538
 539 #ifdef CTDL_IPV6
 540
 541 /*
 542  * This is a generic function to set up a master socket for listening on
 543  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 544  *
 545  * ip_addr      IP address to bind
 546  * port_number  port number to bind
 547  * queue_len    number of incoming connections to allow in the queue
 548  */
 549 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
 550 {
 551         struct protoent *p;
 552         struct sockaddr_in6 sin;
 553         int s, i;
 554
 555         memset(&sin, 0, sizeof(sin));
 556         sin.sin6_family = AF_INET6;
 557
 558         if ((ip_addr == NULL) || (IsEmptyStr(ip_addr)) || (!strcmp(ip_addr, "0.0.0.0"))) {
 559                 sin.sin6_addr = in6addr_any;
 560         } else {
 561                 char bind_to[256];
 562                 if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':'))) {
 563                         snprintf(bind_to, sizeof bind_to, "::ffff:%s", ip_addr);
 564                 }
 565                 else {
 566                         safestrncpy(bind_to, ip_addr, sizeof bind_to);
 567                 }
 568                 if (inet_pton(AF_INET6, bind_to, &sin.sin6_addr) <= 0) {
 569                         lprintf(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 570                         abort();
 571                 }
 572         }
 573
 574         if (port_number == 0) {
 575                 lprintf(1, "Cannot start: no port number specified.\n");
 576                 return (-WC_EXIT_BIND);
 577         }
 578         sin.sin6_port = htons((u_short) port_number);
 579
 580         p = getprotobyname("tcp");
 581
 582         s = socket(PF_INET6, SOCK_STREAM, (p->p_proto));
 583         if (s < 0) {
 584                 lprintf(1, "Can't create a socket: %s\n", strerror(errno));
 585                 return (-WC_EXIT_BIND);
 586         }
 587         /* Set some socket options that make sense. */
 588         i = 1;
 589         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 590
 591         #ifndef __APPLE__
 592         fcntl(s, F_SETFL, O_NONBLOCK); /* maide: this statement is incorrect
 593                                           there should be a preceding F_GETFL
 594                                           and a bitwise OR with the previous
 595                                           fd flags */
 596         #endif
 597
 598         if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 599                 lprintf(1, "Can't bind: %s\n", strerror(errno));
 600                 return (-WC_EXIT_BIND);
 601         }
 602         if (listen(s, queue_len) < 0) {
 603                 lprintf(1, "Can't listen: %s\n", strerror(errno));
 604                 return (-WC_EXIT_BIND);
 605         }
 606         return (s);
 607 }
 608
 609 #else /* CTDL_IPV6 */
 610
 611 /*
 612  * This is a generic function to set up a master socket for listening on
 613  * a TCP port.  The server shuts down if the bind fails.
 614  *
 615  * ip_addr      IP address to bind
 616  * port_number  port number to bind
 617  * queue_len    number of incoming connections to allow in the queue
 618  */
 619 int ig_tcp_server(char *ip_addr, int port_number, int queue_len)
 620 {
 621         struct protoent *p;
 622         struct sockaddr_in sin;
 623         int s, i;
 624
 625         memset(&sin, 0, sizeof(sin));
 626         sin.sin_family = AF_INET;
 627         if (ip_addr == NULL) {
 628                 sin.sin_addr.s_addr = INADDR_ANY;
 629         } else {
 630                 sin.sin_addr.s_addr = inet_addr(ip_addr);
 631         }
 632
 633         if (sin.sin_addr.s_addr == INADDR_NONE) {
 634                 sin.sin_addr.s_addr = INADDR_ANY;
 635         }
 636
 637         if (port_number == 0) {
 638                 lprintf(1, "Cannot start: no port number specified.\n");
 639                 return (-WC_EXIT_BIND);
 640         }
 641         sin.sin_port = htons((u_short) port_number);
 642
 643         p = getprotobyname("tcp");
 644
 645         s = socket(PF_INET, SOCK_STREAM, (p->p_proto));
 646         if (s < 0) {
 647                 lprintf(1, "Can't create a socket: %s\n", strerror(errno));
 648                 return (-WC_EXIT_BIND);
 649         }
 650         /* Set some socket options that make sense. */
 651         i = 1;
 652         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 653
 654         #ifndef __APPLE__
 655         fcntl(s, F_SETFL, O_NONBLOCK); /* maide: this statement is incorrect
 656                                           there should be a preceding F_GETFL
 657                                           and a bitwise OR with the previous
 658                                           fd flags */
 659         #endif
 660
 661         if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
 662                 lprintf(1, "Can't bind: %s\n", strerror(errno));
 663                 return (-WC_EXIT_BIND);
 664         }
 665         if (listen(s, queue_len) < 0) {
 666                 lprintf(1, "Can't listen: %s\n", strerror(errno));
 667                 return (-WC_EXIT_BIND);
 668         }
 669         return (s);
 670 }
 671
 672 #endif /* CTDL_IPV6 */
 673
 674
 675 /*
 676  * Create a Unix domain socket and listen on it
 677  * sockpath - file name of the unix domain socket
 678  * queue_len - Number of incoming connections to allow in the queue
 679  */
 680 int ig_uds_server(char *sockpath, int queue_len)
 681 {
 682         struct sockaddr_un addr;
 683         int s;
 684         int i;
 685         int actual_queue_len;
 686
 687         actual_queue_len = queue_len;
 688         if (actual_queue_len < 5) actual_queue_len = 5;
 689
 690         i = unlink(sockpath);
 691         if ((i != 0) && (errno != ENOENT)) {
 692                 lprintf(1, "webcit: can't unlink %s: %s\n",
 693                         sockpath, strerror(errno));
 694                 return (-WC_EXIT_BIND);
 695         }
 696
 697         memset(&addr, 0, sizeof(addr));
 698         addr.sun_family = AF_UNIX;
 699         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 700
 701         s = socket(AF_UNIX, SOCK_STREAM, 0);
 702         if (s < 0) {
 703                 lprintf(1, "webcit: Can't create a socket: %s\n",
 704                         strerror(errno));
 705                 return (-WC_EXIT_BIND);
 706         }
 707
 708         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 709                 lprintf(1, "webcit: Can't bind: %s\n",
 710                         strerror(errno));
 711                 return (-WC_EXIT_BIND);
 712         }
 713
 714         if (listen(s, actual_queue_len) < 0) {
 715                 lprintf(1, "webcit: Can't listen: %s\n",
 716                         strerror(errno));
 717                 return (-WC_EXIT_BIND);
 718         }
 719
 720         chmod(sockpath, 0777);
 721         return(s);
 722 }
 723
 724
 725
 726
 727 /*
 728  * Read data from the client socket.
 729  *
 730  * sock         socket fd to read from
 731  * buf          buffer to read into
 732  * bytes        number of bytes to read
 733  * timeout      Number of seconds to wait before timing out
 734  *
 735  * Possible return values:
 736  *      1       Requested number of bytes has been read.
 737  *      0       Request timed out.
 738  *      -1      Connection is broken, or other error.
 739  */
 740 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 741 {
 742         const char *Error;
 743         int retval = 0;
 744
 745 #ifdef HAVE_OPENSSL
 746         if (is_https) {
 747                 long bufremain;
 748                 long baselen;
 749
 750                 baselen = StrLength(Target);
 751
 752                 if (Hdr->Pos == NULL)
 753                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 754                 bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 755
 756                 if (bytes < bufremain)
 757                         bufremain = bytes;
 758                 StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 759                 StrBufCutLeft(Hdr->ReadBuf, bufremain);
 760
 761                 if (bytes > bufremain)
 762                 {
 763                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 764                                (retval >= 0))
 765                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 766                         if (retval >= 0) {
 767                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 768 #ifdef HTTP_TRACING
 769                                 write(2, "\033[32m", 5);
 770                                 write(2, buf, bytes);
 771                                 write(2, "\033[30m", 5);
 772 #endif
 773                                 return 1;
 774                         }
 775                         else {
 776                                 lprintf(2, "client_read_ssl() failed\n");
 777                                 return -1;
 778                         }
 779                 }
 780                 else
 781                         return 1;
 782         }
 783 #endif
 784
 785         retval = StrBufReadBLOBBuffered(Target,
 786                                         Hdr->ReadBuf,
 787                                         &Hdr->Pos,
 788                                         &Hdr->http_sock,
 789                                         1,
 790                                         bytes,
 791                                         O_TERM,
 792                                         &Error);
 793         if (retval < 0) {
 794                 lprintf(2, "client_read() failed: %s\n",
 795                         Error);
 796                 return retval;
 797         }
 798
 799 #ifdef HTTP_TRACING
 800         write(2, "\033[32m", 5);
 801         write(2, buf, bytes);
 802         write(2, "\033[30m", 5);
 803 #endif
 804         return 1;
 805 }
 806
 807
 808 /*
 809  * Begin buffering HTTP output so we can transmit it all in one write operation later.
 810  */
 811 void begin_burst(void)
 812 {
 813         if (WC->WBuf == NULL) {
 814                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 815         }
 816 }
 817
 818
 819 /*
 820  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
 821  */
 822 long end_burst(void)
 823 {
 824         wcsession *WCC = WC;
 825         const char *ptr, *eptr;
 826         long count;
 827         ssize_t res = 0;
 828         fd_set wset;
 829         int fdflags;
 830
 831         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
 832         {
 833                 if (CompressBuffer(WCC->WBuf) > 0)
 834                         hprintf("Content-encoding: gzip\r\n");
 835                 else {
 836                         lprintf(CTDL_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
 837                         wc_backtrace();
 838                 }
 839         }
 840
 841         if (WCC->Hdr->HR.prohibit_caching)
 842                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
 843         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
 844
 845         ptr = ChrPtr(WCC->HBuf);
 846         count = StrLength(WCC->HBuf);
 847         eptr = ptr + count;
 848
 849 #ifdef HAVE_OPENSSL
 850         if (is_https) {
 851                 client_write_ssl(WCC->HBuf);
 852                 client_write_ssl(WCC->WBuf);
 853                 return (count);
 854         }
 855 #endif
 856
 857
 858 #ifdef HTTP_TRACING
 859
 860         write(2, "\033[34m", 5);
 861         write(2, ptr, StrLength(WCC->WBuf));
 862         write(2, "\033[30m", 5);
 863 #endif
 864         if (WCC->Hdr->http_sock == -1)
 865                 return -1;
 866         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 867
 868         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
 869                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 870                         FD_ZERO(&wset);
 871                         FD_SET(WCC->Hdr->http_sock, &wset);
 872                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 873                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 874                                 return -1;
 875                         }
 876                 }
 877
 878                 if ((WCC->Hdr->http_sock == -1) ||
 879                     (res = write(WCC->Hdr->http_sock,
 880                                  ptr,
 881                                  count)) == -1) {
 882                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 883                         wc_backtrace();
 884                         return res;
 885                 }
 886                 count -= res;
 887                 ptr += res;
 888         }
 889
 890         ptr = ChrPtr(WCC->WBuf);
 891         count = StrLength(WCC->WBuf);
 892         eptr = ptr + count;
 893
 894 #ifdef HTTP_TRACING
 895
 896         write(2, "\033[34m", 5);
 897         write(2, ptr, StrLength(WCC->WBuf));
 898         write(2, "\033[30m", 5);
 899 #endif
 900
 901         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
 902                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 903                         FD_ZERO(&wset);
 904                         FD_SET(WCC->Hdr->http_sock, &wset);
 905                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 906                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 907                                 return -1;
 908                         }
 909                 }
 910
 911                 if ((WCC->Hdr->http_sock == -1) ||
 912                     (res = write(WCC->Hdr->http_sock,
 913                                  ptr,
 914                                  count)) == -1) {
 915                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 916                         wc_backtrace();
 917                         return res;
 918                 }
 919                 count -= res;
 920                 ptr += res;
 921         }
 922
 923         return StrLength(WCC->WBuf);
 924 }
 925
 926
 927 /*
 928  * lingering_close() a`la Apache. see
 929  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
 930  */
 931 int lingering_close(int fd)
 932 {
 933         char buf[SIZ];
 934         int i;
 935         fd_set set;
 936         struct timeval tv, start;
 937
 938         gettimeofday(&start, NULL);
 939         if (fd == -1)
 940                 return -1;
 941         shutdown(fd, 1);
 942         do {
 943                 do {
 944                         gettimeofday(&tv, NULL);
 945                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
 946                         tv.tv_usec = start.tv_usec - tv.tv_usec;
 947                         if (tv.tv_usec < 0) {
 948                                 tv.tv_sec--;
 949                                 tv.tv_usec += 1000000;
 950                         }
 951                         FD_ZERO(&set);
 952                         FD_SET(fd, &set);
 953                         i = select(fd + 1, &set, NULL, NULL, &tv);
 954                 } while (i == -1 && errno == EINTR);
 955
 956                 if (i <= 0)
 957                         break;
 958
 959                 i = read(fd, buf, sizeof buf);
 960         } while (i != 0 && (i != -1 || errno == EINTR));
 961
 962         return close(fd);
 963 }
 964
 965 void
 966 HttpNewModule_TCPSOCKETS
 967 (ParsedHttpHdrs *httpreq)
 968 {
 969
 970         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
 971 }
 972
 973 void
 974 HttpDetachModule_TCPSOCKETS
 975 (ParsedHttpHdrs *httpreq)
 976 {
 977
 978         FlushStrBuf(httpreq->ReadBuf);
 979         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
 980 }
 981
 982 void
 983 HttpDestroyModule_TCPSOCKETS
 984 (ParsedHttpHdrs *httpreq)
 985 {
 986
 987         FreeStrBuf(&httpreq->ReadBuf);
 988 }
 989
 990
 991 void
 992 SessionNewModule_TCPSOCKETS
 993 (wcsession *sess)
 994 {
 995         sess->CLineBuf = NewStrBuf();
 996         sess->MigrateReadLineBuf = NewStrBuf();
 997 }
 998
 999 void
1000 SessionDestroyModule_TCPSOCKETS
1001 (wcsession *sess)
1002 {
1003         FreeStrBuf(&sess->CLineBuf);
1004         FreeStrBuf(&sess->ReadBuf);
1005         sess->ReadPos = NULL;
1006         FreeStrBuf(&sess->MigrateReadLineBuf);
1007         if (sess->serv_sock > 0)
1008                 close(sess->serv_sock);
1009 }