webcit/tcp_sockets.c

   1 /*
   2  * Copyright (c) 1987-2011 by the citadel.org team
   3  *
   4  * This program is open source software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 /*
  20  * Uncomment this to log all communications with the Citadel server
  21 #define SERV_TRACE 1
  22  */
  23
  24
  25 #include "webcit.h"
  26 #include "webserver.h"
  27
  28 extern int DisableGzip;
  29 long MaxRead = -1; /* should we do READ scattered or all at once? */
  30
  31 /*
  32  * register the timeout
  33  */
  34 RETSIGTYPE timeout(int signum)
  35 {
  36         syslog(1, "Connection timed out; unable to reach citserver\n");
  37         /* no exit here, since we need to server the connection unreachable thing. exit(3); */
  38 }
  39
  40
  41 /*
  42  * Client side - connect to a unix domain socket
  43  */
  44 int uds_connectsock(char *sockpath)
  45 {
  46         struct sockaddr_un addr;
  47         int s;
  48
  49         memset(&addr, 0, sizeof(addr));
  50         addr.sun_family = AF_UNIX;
  51         strncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
  52
  53         s = socket(AF_UNIX, SOCK_STREAM, 0);
  54         if (s < 0) {
  55                 syslog(1, "Can't create socket[%s]: %s\n", sockpath, strerror(errno));
  56                 return(-1);
  57         }
  58
  59         if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
  60                 syslog(1, "Can't connect [%s]: %s\n", sockpath, strerror(errno));
  61                 close(s);
  62                 return(-1);
  63         }
  64
  65         return s;
  66 }
  67
  68
  69 /*
  70  * TCP client - connect to a host/port
  71  */
  72 int tcp_connectsock(char *host, char *service)
  73 {
  74         struct in6_addr serveraddr;
  75         struct addrinfo hints;
  76         struct addrinfo *res = NULL;
  77         struct addrinfo *ai = NULL;
  78         int rc = (-1);
  79         int s = (-1);
  80
  81         if ((host == NULL) || IsEmptyStr(host))
  82                 return (-1);
  83         if ((service == NULL) || IsEmptyStr(service))
  84                 return (-1);
  85
  86         syslog(9, "tcp_connectsock(%s,%s)\n", host, service);
  87
  88         memset(&hints, 0x00, sizeof(hints));
  89         hints.ai_flags = AI_NUMERICSERV;
  90         hints.ai_family = AF_UNSPEC;
  91         hints.ai_socktype = SOCK_STREAM;
  92
  93         /*
  94          * Handle numeric IPv4 and IPv6 addresses
  95          */
  96         rc = inet_pton(AF_INET, host, &serveraddr);
  97         if (rc == 1) {                                          /* dotted quad */
  98                 hints.ai_family = AF_INET;
  99                 hints.ai_flags |= AI_NUMERICHOST;
 100         } else {
 101                 rc = inet_pton(AF_INET6, host, &serveraddr);
 102                 if (rc == 1) {                                  /* IPv6 address */
 103                         hints.ai_family = AF_INET6;
 104                         hints.ai_flags |= AI_NUMERICHOST;
 105                 }
 106         }
 107
 108         /* Begin the connection process */
 109
 110         rc = getaddrinfo(host, service, &hints, &res);
 111         if (rc != 0) {
 112                 syslog(1, "%s: %s\n", host, gai_strerror(rc));
 113                 freeaddrinfo(res);
 114                 return(-1);
 115         }
 116
 117         /*
 118          * Try all available addresses until we connect to one or until we run out.
 119          */
 120         for (ai = res; ai != NULL; ai = ai->ai_next) {
 121
 122                 if (ai->ai_family == AF_INET) syslog(9, "Trying IPv4\n");
 123                 else if (ai->ai_family == AF_INET6) syslog(9, "Trying IPv6\n");
 124                 else syslog(9, "This is going to fail.\n");
 125
 126                 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 127                 if (s < 0) {
 128                         syslog(1, "socket() failed: %s\n", strerror(errno));
 129                         freeaddrinfo(res);
 130                         return(-1);
 131                 }
 132                 rc = connect(s, ai->ai_addr, ai->ai_addrlen);
 133                 if (rc >= 0) {
 134                         freeaddrinfo(res);
 135                         return(s);
 136                 }
 137                 else {
 138                         syslog(1, "connect() failed: %s\n", strerror(errno));
 139                         close(s);
 140                 }
 141         }
 142         freeaddrinfo(res);
 143         return(-1);
 144 }
 145
 146
 147 /*
 148  *  input string from pipe
 149  */
 150 int serv_getln(char *strbuf, int bufsize)
 151 {
 152         wcsession *WCC = WC;
 153         int len;
 154
 155         *strbuf = '\0';
 156         StrBuf_ServGetln(WCC->MigrateReadLineBuf);
 157         len = StrLength(WCC->MigrateReadLineBuf);
 158         if (len > bufsize)
 159                 len = bufsize - 1;
 160         memcpy(strbuf, ChrPtr(WCC->MigrateReadLineBuf), len);
 161         FlushStrBuf(WCC->MigrateReadLineBuf);
 162         strbuf[len] = '\0';
 163 #ifdef SERV_TRACE
 164         syslog(9, "%3d<<<%s\n", WC->serv_sock, strbuf);
 165 #endif
 166         return len;
 167 }
 168
 169
 170 int StrBuf_ServGetln(StrBuf *buf)
 171 {
 172         wcsession *WCC = WC;
 173         const char *ErrStr = NULL;
 174         int rc;
 175
 176         FlushStrBuf(buf);
 177         rc = StrBufTCP_read_buffered_line_fast(buf,
 178                                                WCC->ReadBuf,
 179                                                &WCC->ReadPos,
 180                                                &WCC->serv_sock,
 181                                                5, 1,
 182                                                &ErrStr);
 183         if (rc < 0)
 184         {
 185                 syslog(1, "Server connection broken: %s\n",
 186                         (ErrStr)?ErrStr:"");
 187                 wc_backtrace();
 188                 WCC->serv_sock = (-1);
 189                 WCC->connected = 0;
 190                 WCC->logged_in = 0;
 191         }
 192 #ifdef SERV_TRACE
 193         else
 194         {
 195                 long pos = 0;
 196                 if (WCC->ReadPos != NULL)
 197                         pos = WCC->ReadPos - ChrPtr(WCC->ReadBuf);
 198                 syslog(9, "%3d<<<[%ld]%s\n", WC->serv_sock, pos, ChrPtr(buf));
 199         }
 200 #endif
 201         return rc;
 202 }
 203
 204 int StrBuf_ServGetBLOBBuffered(StrBuf *buf, long BlobSize)
 205 {
 206         wcsession *WCC = WC;
 207         const char *ErrStr;
 208         int rc;
 209
 210         rc = StrBufReadBLOBBuffered(buf,
 211                                     WCC->ReadBuf,
 212                                     &WCC->ReadPos,
 213                                     &WCC->serv_sock,
 214                                     1,
 215                                     BlobSize,
 216                                     NNN_TERM,
 217                                     &ErrStr);
 218         if (rc < 0)
 219         {
 220                 syslog(1, "Server connection broken: %s\n",
 221                         (ErrStr)?ErrStr:"");
 222                 wc_backtrace();
 223                 WCC->serv_sock = (-1);
 224                 WCC->connected = 0;
 225                 WCC->logged_in = 0;
 226         }
 227 #ifdef SERV_TRACE
 228         else
 229                 syslog(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 230 #endif
 231
 232         return rc;
 233 }
 234
 235 int StrBuf_ServGetBLOB(StrBuf *buf, long BlobSize)
 236 {
 237         wcsession *WCC = WC;
 238         const char *ErrStr;
 239         int rc;
 240
 241         WCC->ReadPos = NULL;
 242         rc = StrBufReadBLOB(buf, &WCC->serv_sock, 1, BlobSize, &ErrStr);
 243         if (rc < 0)
 244         {
 245                 syslog(1, "Server connection broken: %s\n",
 246                         (ErrStr)?ErrStr:"");
 247                 wc_backtrace();
 248                 WCC->serv_sock = (-1);
 249                 WCC->connected = 0;
 250                 WCC->logged_in = 0;
 251         }
 252 #ifdef SERV_TRACE
 253         else
 254                 syslog(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 255 #endif
 256
 257         return rc;
 258 }
 259
 260
 261 void FlushReadBuf (void)
 262 {
 263         long len;
 264         const char *pch;
 265         const char *pche;
 266         wcsession *WCC = WC;
 267
 268         len = StrLength(WCC->ReadBuf);
 269         if ((len > 0) &&
 270             (WCC->ReadPos != NULL) &&
 271             (WCC->ReadPos != StrBufNOTNULL))
 272
 273         {
 274                 pch = ChrPtr(WCC->ReadBuf);
 275                 pche = pch + len;
 276                 if (WCC->ReadPos != pche)
 277                 {
 278                         syslog(1, "ERROR: somebody didn't eat his soup! Remaing Chars: %d [%s]\n",
 279                                 pche - WCC->ReadPos, pche);
 280                         syslog(1,
 281                                 "--------------------------------------------------------------------------------\n"
 282                                 "Whole buf: [%s]\n"
 283                                 "--------------------------------------------------------------------------------\n",
 284                                 pch);
 285                         AppendImportantMessage(HKEY("Suppenkasper alert! watch your webcit logfile and get connected to your favourite opensource Crew."));
 286                 }
 287         }
 288
 289         FlushStrBuf(WCC->ReadBuf);
 290         WCC->ReadPos = NULL;
 291
 292
 293 }
 294
 295
 296 /*
 297  *  send binary to server
 298  *  buf the buffer to write to citadel server
 299  *  nbytes how many bytes to send to citadel server
 300  */
 301 void serv_write(const char *buf, int nbytes)
 302 {
 303         wcsession *WCC = WC;
 304         int bytes_written = 0;
 305         int retval;
 306
 307         FlushReadBuf();
 308         while (bytes_written < nbytes) {
 309                 retval = write(WCC->serv_sock, &buf[bytes_written],
 310                                nbytes - bytes_written);
 311                 if (retval < 1) {
 312                         const char *ErrStr = strerror(errno);
 313                         syslog(1, "Server connection broken: %s\n",
 314                                 (ErrStr)?ErrStr:"");
 315                         close(WCC->serv_sock);
 316                         WCC->serv_sock = (-1);
 317                         WCC->connected = 0;
 318                         WCC->logged_in = 0;
 319                         return;
 320                 }
 321                 bytes_written = bytes_written + retval;
 322         }
 323 }
 324
 325
 326 /*
 327  *  send line to server
 328  *  string the line to send to the citadel server
 329  */
 330 void serv_puts(const char *string)
 331 {
 332 #ifdef SERV_TRACE
 333         syslog(9, "%3d>>>%s\n", WC->serv_sock, string);
 334 #endif
 335         FlushReadBuf();
 336
 337         serv_write(string, strlen(string));
 338         serv_write("\n", 1);
 339 }
 340
 341 /*
 342  *  send line to server
 343  *  string the line to send to the citadel server
 344  */
 345 void serv_putbuf(const StrBuf *string)
 346 {
 347 #ifdef SERV_TRACE
 348         syslog(9, "%3d>>>%s\n", WC->serv_sock, ChrPtr(string));
 349 #endif
 350         FlushReadBuf();
 351
 352         serv_write(ChrPtr(string), StrLength(string));
 353         serv_write("\n", 1);
 354 }
 355
 356
 357 /*
 358  *  convenience function to send stuff to the server
 359  *  format the formatstring
 360  *  ... the entities to insert into format
 361  */
 362 void serv_printf(const char *format,...)
 363 {
 364         va_list arg_ptr;
 365         char buf[SIZ];
 366         size_t len;
 367
 368         FlushReadBuf();
 369
 370         va_start(arg_ptr, format);
 371         vsnprintf(buf, sizeof buf, format, arg_ptr);
 372         va_end(arg_ptr);
 373
 374         len = strlen(buf);
 375         buf[len++] = '\n';
 376         buf[len] = '\0';
 377         serv_write(buf, len);
 378 #ifdef SERV_TRACE
 379         syslog(9, ">>>%s", buf);
 380 #endif
 381 }
 382
 383
 384 /*
 385  * Read binary data from server into memory using a series of server READ commands.
 386  * returns the read content as StrBuf
 387  */
 388 int serv_read_binary(StrBuf *Ret, size_t total_len, StrBuf *Buf)
 389 {
 390         wcsession *WCC = WC;
 391         size_t bytes_read = 0;
 392         size_t this_block = 0;
 393         int rc;
 394
 395         if (Ret == NULL) {
 396                 return -1;
 397         }
 398
 399         while (bytes_read < total_len) {
 400
 401                 if (WCC->serv_sock==-1) {
 402                         FlushStrBuf(Ret);
 403                         return -1;
 404                 }
 405
 406                 serv_printf("READ %d|%d", bytes_read, total_len-bytes_read);
 407                 if ( (StrBuf_ServGetln(Buf) > 0) && (GetServerStatus(Buf, NULL) == 6) ) {
 408                         StrBufCutLeft(Buf, 4);
 409                         this_block = StrTol(Buf);
 410                         rc = StrBuf_ServGetBLOBBuffered(Ret, this_block);
 411                         if (rc < 0) {
 412                                 syslog(1, "Server connection broken during download\n");
 413                                 wc_backtrace();
 414                                 WCC->serv_sock = (-1);
 415                                 WCC->connected = 0;
 416                                 WCC->logged_in = 0;
 417                                 return rc;
 418                         }
 419                         bytes_read += rc;
 420                 }
 421         }
 422
 423         return StrLength(Ret);
 424 }
 425
 426
 427 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 428 {
 429         const char *Error;
 430 #ifdef HAVE_OPENSSL
 431         const char *pch, *pchs;
 432         int rlen, len, retval = 0;
 433
 434         if (is_https) {
 435                 int ntries = 0;
 436                 if (StrLength(Hdr->ReadBuf) > 0) {
 437                         pchs = ChrPtr(Hdr->ReadBuf);
 438                         pch = strchr(pchs, '\n');
 439                         if (pch != NULL) {
 440                                 rlen = 0;
 441                                 len = pch - pchs;
 442                                 if (len > 0 && (*(pch - 1) == '\r') )
 443                                         rlen ++;
 444                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 445                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 446                                 return len - rlen;
 447                         }
 448                 }
 449
 450                 while (retval == 0) {
 451                                 pch = NULL;
 452                                 pchs = ChrPtr(Hdr->ReadBuf);
 453                                 if (*pchs != '\0')
 454                                         pch = strchr(pchs, '\n');
 455                                 if (pch == NULL) {
 456                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 457                                         pchs = ChrPtr(Hdr->ReadBuf);
 458                                         pch = strchr(pchs, '\n');
 459                                 }
 460                                 if (retval == 0) {
 461                                         sleeeeeeeeeep(1);
 462                                         ntries ++;
 463                                 }
 464                                 if (ntries > 10)
 465                                         return 0;
 466                 }
 467                 if ((retval > 0) && (pch != NULL)) {
 468                         rlen = 0;
 469                         len = pch - pchs;
 470                         if (len > 0 && (*(pch - 1) == '\r') )
 471                                 rlen ++;
 472                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 473                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 474                         return len - rlen;
 475
 476                 }
 477                 else
 478                         return -1;
 479         }
 480         else
 481 #endif
 482                 return StrBufTCP_read_buffered_line_fast(Target,
 483                                                          Hdr->ReadBuf,
 484                                                          &Hdr->Pos,
 485                                                          &Hdr->http_sock,
 486                                                          5,
 487                                                          1,
 488                                                          &Error);
 489 }
 490
 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.  (IPv4/IPv6 version)
 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 webcit_tcp_server(char *ip_addr, int port_number, int queue_len)
 501 {
 502         struct protoent *p;
 503         struct sockaddr_in6 sin6;
 504         struct sockaddr_in sin4;
 505         int s, i, b;
 506         int ip_version = 6;
 507
 508         memset(&sin6, 0, sizeof(sin6));
 509         memset(&sin4, 0, sizeof(sin4));
 510         sin6.sin6_family = AF_INET6;
 511         sin4.sin_family = AF_INET;
 512
 513         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 514                 || (IsEmptyStr(ip_addr))
 515                 || (!strcmp(ip_addr, "*"))
 516         ) {
 517                 ip_version = 6;
 518                 sin6.sin6_addr = in6addr_any;
 519         }
 520         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 521         {
 522                 ip_version = 4;
 523                 sin4.sin_addr.s_addr = INADDR_ANY;
 524         }
 525         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 526         {
 527                 ip_version = 4;
 528                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 529                         syslog(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 530                         return (-WC_EXIT_BIND);
 531                 }
 532         }
 533         else                                                                            /* specific IPv6 */
 534         {
 535                 ip_version = 6;
 536                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 537                         syslog(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 538                         return (-WC_EXIT_BIND);
 539                 }
 540         }
 541
 542         if (port_number == 0) {
 543                 syslog(1, "Cannot start: no port number specified.\n");
 544                 return (-WC_EXIT_BIND);
 545         }
 546         sin6.sin6_port = htons((u_short) port_number);
 547         sin4.sin_port = htons((u_short) port_number);
 548
 549         p = getprotobyname("tcp");
 550
 551         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 552         if (s < 0) {
 553                 syslog(1, "Can't create a listening socket: %s\n", strerror(errno));
 554                 return (-WC_EXIT_BIND);
 555         }
 556         /* Set some socket options that make sense. */
 557         i = 1;
 558         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 559
 560         if (ip_version == 6) {
 561                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 562         }
 563         else {
 564                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 565         }
 566
 567         if (b < 0) {
 568                 syslog(1, "Can't bind: %s\n", strerror(errno));
 569                 return (-WC_EXIT_BIND);
 570         }
 571
 572         if (listen(s, queue_len) < 0) {
 573                 syslog(1, "Can't listen: %s\n", strerror(errno));
 574                 return (-WC_EXIT_BIND);
 575         }
 576         return (s);
 577 }
 578
 579
 580 /*
 581  * Create a Unix domain socket and listen on it
 582  * sockpath - file name of the unix domain socket
 583  * queue_len - Number of incoming connections to allow in the queue
 584  */
 585 int webcit_uds_server(char *sockpath, int queue_len)
 586 {
 587         struct sockaddr_un addr;
 588         int s;
 589         int i;
 590         int actual_queue_len;
 591
 592         actual_queue_len = queue_len;
 593         if (actual_queue_len < 5) actual_queue_len = 5;
 594
 595         i = unlink(sockpath);
 596         if ((i != 0) && (errno != ENOENT)) {
 597                 syslog(1, "webcit: can't unlink %s: %s\n",
 598                         sockpath, strerror(errno));
 599                 return (-WC_EXIT_BIND);
 600         }
 601
 602         memset(&addr, 0, sizeof(addr));
 603         addr.sun_family = AF_UNIX;
 604         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 605
 606         s = socket(AF_UNIX, SOCK_STREAM, 0);
 607         if (s < 0) {
 608                 syslog(1, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 609                 return (-WC_EXIT_BIND);
 610         }
 611
 612         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 613                 syslog(1, "webcit: Can't bind: %s\n",
 614                         strerror(errno));
 615                 return (-WC_EXIT_BIND);
 616         }
 617
 618         if (listen(s, actual_queue_len) < 0) {
 619                 syslog(1, "webcit: Can't listen: %s\n",
 620                         strerror(errno));
 621                 return (-WC_EXIT_BIND);
 622         }
 623
 624         chmod(sockpath, 0777);
 625         return(s);
 626 }
 627
 628
 629
 630
 631 /*
 632  * Read data from the client socket.
 633  *
 634  * sock         socket fd to read from
 635  * buf          buffer to read into
 636  * bytes        number of bytes to read
 637  * timeout      Number of seconds to wait before timing out
 638  *
 639  * Possible return values:
 640  *      1       Requested number of bytes has been read.
 641  *      0       Request timed out.
 642  *      -1      Connection is broken, or other error.
 643  */
 644 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 645 {
 646         const char *Error;
 647         int retval = 0;
 648
 649 #ifdef HAVE_OPENSSL
 650         if (is_https) {
 651                 long bufremain;
 652                 long baselen;
 653
 654                 baselen = StrLength(Target);
 655
 656                 if (Hdr->Pos == NULL)
 657                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 658                 bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 659
 660                 if (bytes < bufremain)
 661                         bufremain = bytes;
 662                 StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 663                 StrBufCutLeft(Hdr->ReadBuf, bufremain);
 664
 665                 if (bytes > bufremain)
 666                 {
 667                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 668                                (retval >= 0))
 669                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 670                         if (retval >= 0) {
 671                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 672 #ifdef HTTP_TRACING
 673                                 write(2, "\033[32m", 5);
 674                                 write(2, buf, bytes);
 675                                 write(2, "\033[30m", 5);
 676 #endif
 677                                 return 1;
 678                         }
 679                         else {
 680                                 syslog(2, "client_read_ssl() failed\n");
 681                                 return -1;
 682                         }
 683                 }
 684                 else
 685                         return 1;
 686         }
 687 #endif
 688
 689         retval = StrBufReadBLOBBuffered(Target,
 690                                         Hdr->ReadBuf,
 691                                         &Hdr->Pos,
 692                                         &Hdr->http_sock,
 693                                         1,
 694                                         bytes,
 695                                         O_TERM,
 696                                         &Error);
 697         if (retval < 0) {
 698                 syslog(2, "client_read() failed: %s\n",
 699                         Error);
 700                 wc_backtrace();
 701                 return retval;
 702         }
 703
 704 #ifdef HTTP_TRACING
 705         write(2, "\033[32m", 5);
 706         write(2, buf, bytes);
 707         write(2, "\033[30m", 5);
 708 #endif
 709         return 1;
 710 }
 711
 712
 713 /*
 714  * Begin buffering HTTP output so we can transmit it all in one write operation later.
 715  */
 716 void begin_burst(void)
 717 {
 718         if (WC->WBuf == NULL) {
 719                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 720         }
 721 }
 722
 723
 724 /*
 725  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
 726  */
 727 long end_burst(void)
 728 {
 729         wcsession *WCC = WC;
 730         const char *ptr, *eptr;
 731         long count;
 732         ssize_t res = 0;
 733         fd_set wset;
 734         int fdflags;
 735
 736         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
 737         {
 738                 if (CompressBuffer(WCC->WBuf) > 0)
 739                         hprintf("Content-encoding: gzip\r\n");
 740                 else {
 741                         syslog(LOG_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
 742                         wc_backtrace();
 743                 }
 744         }
 745
 746         if (WCC->WFBuf != NULL) {
 747                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
 748                 FreeStrBuf(&WCC->WFBuf);
 749         }
 750
 751         if (WCC->Hdr->HR.prohibit_caching)
 752                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
 753         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
 754
 755         ptr = ChrPtr(WCC->HBuf);
 756         count = StrLength(WCC->HBuf);
 757         eptr = ptr + count;
 758
 759 #ifdef HAVE_OPENSSL
 760         if (is_https) {
 761                 client_write_ssl(WCC->HBuf);
 762                 client_write_ssl(WCC->WBuf);
 763                 return (count);
 764         }
 765 #endif
 766
 767
 768 #ifdef HTTP_TRACING
 769
 770         write(2, "\033[34m", 5);
 771         write(2, ptr, StrLength(WCC->WBuf));
 772         write(2, "\033[30m", 5);
 773 #endif
 774         if (WCC->Hdr->http_sock == -1)
 775                 return -1;
 776         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 777
 778         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
 779                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 780                         FD_ZERO(&wset);
 781                         FD_SET(WCC->Hdr->http_sock, &wset);
 782                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 783                                 syslog(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 784                                 return -1;
 785                         }
 786                 }
 787
 788                 if ((WCC->Hdr->http_sock == -1) ||
 789                     (res = write(WCC->Hdr->http_sock,
 790                                  ptr,
 791                                  count)) == -1) {
 792                         syslog(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 793                         wc_backtrace();
 794                         return res;
 795                 }
 796                 count -= res;
 797                 ptr += res;
 798         }
 799
 800         ptr = ChrPtr(WCC->WBuf);
 801         count = StrLength(WCC->WBuf);
 802         eptr = ptr + count;
 803
 804 #ifdef HTTP_TRACING
 805
 806         write(2, "\033[34m", 5);
 807         write(2, ptr, StrLength(WCC->WBuf));
 808         write(2, "\033[30m", 5);
 809 #endif
 810
 811         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
 812                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 813                         FD_ZERO(&wset);
 814                         FD_SET(WCC->Hdr->http_sock, &wset);
 815                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 816                                 syslog(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 817                                 return -1;
 818                         }
 819                 }
 820
 821                 if ((WCC->Hdr->http_sock == -1) ||
 822                     (res = write(WCC->Hdr->http_sock,
 823                                  ptr,
 824                                  count)) == -1) {
 825                         syslog(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 826                         wc_backtrace();
 827                         return res;
 828                 }
 829                 count -= res;
 830                 ptr += res;
 831         }
 832
 833         return StrLength(WCC->WBuf);
 834 }
 835
 836
 837 /*
 838  * lingering_close() a`la Apache. see
 839  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
 840  */
 841 int lingering_close(int fd)
 842 {
 843         char buf[SIZ];
 844         int i;
 845         fd_set set;
 846         struct timeval tv, start;
 847
 848         gettimeofday(&start, NULL);
 849         if (fd == -1)
 850                 return -1;
 851         shutdown(fd, 1);
 852         do {
 853                 do {
 854                         gettimeofday(&tv, NULL);
 855                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
 856                         tv.tv_usec = start.tv_usec - tv.tv_usec;
 857                         if (tv.tv_usec < 0) {
 858                                 tv.tv_sec--;
 859                                 tv.tv_usec += 1000000;
 860                         }
 861                         FD_ZERO(&set);
 862                         FD_SET(fd, &set);
 863                         i = select(fd + 1, &set, NULL, NULL, &tv);
 864                 } while (i == -1 && errno == EINTR);
 865
 866                 if (i <= 0)
 867                         break;
 868
 869                 i = read(fd, buf, sizeof buf);
 870         } while (i != 0 && (i != -1 || errno == EINTR));
 871
 872         return close(fd);
 873 }
 874
 875 void
 876 HttpNewModule_TCPSOCKETS
 877 (ParsedHttpHdrs *httpreq)
 878 {
 879
 880         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
 881 }
 882
 883 void
 884 HttpDetachModule_TCPSOCKETS
 885 (ParsedHttpHdrs *httpreq)
 886 {
 887
 888         FlushStrBuf(httpreq->ReadBuf);
 889         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
 890 }
 891
 892 void
 893 HttpDestroyModule_TCPSOCKETS
 894 (ParsedHttpHdrs *httpreq)
 895 {
 896
 897         FreeStrBuf(&httpreq->ReadBuf);
 898 }
 899
 900
 901 void
 902 SessionNewModule_TCPSOCKETS
 903 (wcsession *sess)
 904 {
 905         sess->CLineBuf = NewStrBuf();
 906         sess->MigrateReadLineBuf = NewStrBuf();
 907 }
 908
 909 void
 910 SessionDestroyModule_TCPSOCKETS
 911 (wcsession *sess)
 912 {
 913         FreeStrBuf(&sess->CLineBuf);
 914         FreeStrBuf(&sess->ReadBuf);
 915         sess->ReadPos = NULL;
 916         FreeStrBuf(&sess->MigrateReadLineBuf);
 917         if (sess->serv_sock > 0)
 918                 close(sess->serv_sock);
 919 }