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  * Client side - connect to a unix domain socket
  45  */
  46 int uds_connectsock(char *sockpath)
  47 {
  48         struct sockaddr_un addr;
  49         int s;
  50
  51         memset(&addr, 0, sizeof(addr));
  52         addr.sun_family = AF_UNIX;
  53         strncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
  54
  55         s = socket(AF_UNIX, SOCK_STREAM, 0);
  56         if (s < 0) {
  57                 lprintf(1, "Can't create socket[%s]: %s\n", sockpath, strerror(errno));
  58                 return(-1);
  59         }
  60
  61         if (connect(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
  62                 lprintf(1, "Can't connect [%s]: %s\n", sockpath, strerror(errno));
  63                 close(s);
  64                 return(-1);
  65         }
  66
  67         return s;
  68 }
  69
  70
  71 /*
  72  * TCP client - connect to a host/port
  73  */
  74 int tcp_connectsock(char *host, char *service)
  75 {
  76         struct in6_addr serveraddr;
  77         struct addrinfo hints;
  78         struct addrinfo *res = NULL;
  79         struct addrinfo *ai = NULL;
  80         int rc = (-1);
  81         int s = (-1);
  82
  83         if ((host == NULL) || IsEmptyStr(host))
  84                 return (-1);
  85         if ((service == NULL) || IsEmptyStr(service))
  86                 return (-1);
  87
  88         lprintf(9, "tcp_connectsock(%s,%s)\n", host, service);
  89
  90         memset(&hints, 0x00, sizeof(hints));
  91         hints.ai_flags = AI_NUMERICSERV;
  92         hints.ai_family = AF_UNSPEC;
  93         hints.ai_socktype = SOCK_STREAM;
  94
  95         /*
  96          * Handle numeric IPv4 and IPv6 addresses
  97          */
  98         rc = inet_pton(AF_INET, host, &serveraddr);
  99         if (rc == 1) {                                          /* dotted quad */
 100                 hints.ai_family = AF_INET;
 101                 hints.ai_flags |= AI_NUMERICHOST;
 102         } else {
 103                 rc = inet_pton(AF_INET6, host, &serveraddr);
 104                 if (rc == 1) {                                  /* IPv6 address */
 105                         hints.ai_family = AF_INET6;
 106                         hints.ai_flags |= AI_NUMERICHOST;
 107                 }
 108         }
 109
 110         /* Begin the connection process */
 111
 112         rc = getaddrinfo(host, service, &hints, &res);
 113         if (rc != 0) {
 114                 lprintf(1, "%s: %s\n", host, gai_strerror(rc));
 115                 return(-1);
 116         }
 117
 118         /*
 119          * Try all available addresses until we connect to one or until we run out.
 120          */
 121         for (ai = res; ai != NULL; ai = ai->ai_next) {
 122
 123                 if (ai->ai_family == AF_INET) lprintf(9, "Trying IPv4\n");
 124                 else if (ai->ai_family == AF_INET6) lprintf(9, "Trying IPv6\n");
 125                 else lprintf(9, "This is going to fail.\n");
 126
 127                 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 128                 if (s < 0) {
 129                         lprintf(1, "socket() failed: %s\n", strerror(errno));
 130                         return(-1);
 131                 }
 132                 rc = connect(s, ai->ai_addr, ai->ai_addrlen);
 133                 if (rc >= 0) {
 134                         return(s);
 135                 }
 136                 else {
 137                         lprintf(1, "connect() failed: %s\n", strerror(errno));
 138                         close(s);
 139                 }
 140         }
 141
 142         return(-1);
 143 }
 144
 145
 146 /*
 147  *  input string from pipe
 148  */
 149 int serv_getln(char *strbuf, int bufsize)
 150 {
 151         wcsession *WCC = WC;
 152         int len;
 153
 154         *strbuf = '\0';
 155         StrBuf_ServGetln(WCC->MigrateReadLineBuf);
 156         len = StrLength(WCC->MigrateReadLineBuf);
 157         if (len > bufsize)
 158                 len = bufsize - 1;
 159         memcpy(strbuf, ChrPtr(WCC->MigrateReadLineBuf), len);
 160         FlushStrBuf(WCC->MigrateReadLineBuf);
 161         strbuf[len] = '\0';
 162 #ifdef SERV_TRACE
 163         lprintf(9, "%3d<<<%s\n", WC->serv_sock, strbuf);
 164 #endif
 165         return len;
 166 }
 167
 168
 169 int StrBuf_ServGetln(StrBuf *buf)
 170 {
 171         wcsession *WCC = WC;
 172         const char *ErrStr = NULL;
 173         int rc;
 174
 175         FlushStrBuf(buf);
 176         rc = StrBufTCP_read_buffered_line_fast(buf,
 177                                                WCC->ReadBuf,
 178                                                &WCC->ReadPos,
 179                                                &WCC->serv_sock,
 180                                                5, 1,
 181                                                &ErrStr);
 182         if (rc < 0)
 183         {
 184                 lprintf(1, "Server connection broken: %s\n",
 185                         (ErrStr)?ErrStr:"");
 186                 wc_backtrace();
 187                 WCC->serv_sock = (-1);
 188                 WCC->connected = 0;
 189                 WCC->logged_in = 0;
 190         }
 191 #ifdef SERV_TRACE
 192         else
 193         {
 194                 long pos=0;
 195                 if (WCC->ReadPos != NULL)
 196                         pos = WCC->ReadPos - ChrPtr(buf);
 197                 lprintf(9, "%3d<<<[%ld]%s\n", WC->serv_sock, pos, ChrPtr(buf));
 198         }
 199 #endif
 200         return rc;
 201 }
 202
 203 int StrBuf_ServGetBLOBBuffered(StrBuf *buf, long BlobSize)
 204 {
 205         wcsession *WCC = WC;
 206         const char *ErrStr;
 207         int rc;
 208
 209         rc = StrBufReadBLOBBuffered(buf,
 210                                     WCC->ReadBuf,
 211                                     &WCC->ReadPos,
 212                                     &WCC->serv_sock,
 213                                     1,
 214                                     BlobSize,
 215                                     NNN_TERM,
 216                                     &ErrStr);
 217         if (rc < 0)
 218         {
 219                 lprintf(1, "Server connection broken: %s\n",
 220                         (ErrStr)?ErrStr:"");
 221                 wc_backtrace();
 222                 WCC->serv_sock = (-1);
 223                 WCC->connected = 0;
 224                 WCC->logged_in = 0;
 225         }
 226 #ifdef SERV_TRACE
 227         else
 228                 lprintf(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 229 #endif
 230
 231         return rc;
 232 }
 233
 234 int StrBuf_ServGetBLOB(StrBuf *buf, long BlobSize)
 235 {
 236         wcsession *WCC = WC;
 237         const char *ErrStr;
 238         int rc;
 239
 240         WCC->ReadPos = NULL;
 241         rc = StrBufReadBLOB(buf, &WCC->serv_sock, 1, BlobSize, &ErrStr);
 242         if (rc < 0)
 243         {
 244                 lprintf(1, "Server connection broken: %s\n",
 245                         (ErrStr)?ErrStr:"");
 246                 wc_backtrace();
 247                 WCC->serv_sock = (-1);
 248                 WCC->connected = 0;
 249                 WCC->logged_in = 0;
 250         }
 251 #ifdef SERV_TRACE
 252         else
 253                 lprintf(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 254 #endif
 255
 256         return rc;
 257 }
 258
 259 /*
 260  *  send binary to server
 261  *  buf the buffer to write to citadel server
 262  *  nbytes how many bytes to send to citadel server
 263  */
 264 void serv_write(const char *buf, int nbytes)
 265 {
 266         wcsession *WCC = WC;
 267         int bytes_written = 0;
 268         int retval;
 269
 270         FlushStrBuf(WCC->ReadBuf);
 271         WCC->ReadPos = NULL;
 272         while (bytes_written < nbytes) {
 273                 retval = write(WCC->serv_sock, &buf[bytes_written],
 274                                nbytes - bytes_written);
 275                 if (retval < 1) {
 276                         const char *ErrStr = strerror(errno);
 277                         lprintf(1, "Server connection broken: %s\n",
 278                                 (ErrStr)?ErrStr:"");
 279                         close(WCC->serv_sock);
 280                         WCC->serv_sock = (-1);
 281                         WCC->connected = 0;
 282                         WCC->logged_in = 0;
 283                         return;
 284                 }
 285                 bytes_written = bytes_written + retval;
 286         }
 287 }
 288
 289
 290 /*
 291  *  send line to server
 292  *  string the line to send to the citadel server
 293  */
 294 void serv_puts(const char *string)
 295 {
 296         wcsession *WCC = WC;
 297 #ifdef SERV_TRACE
 298         lprintf(9, "%3d>>>%s\n", WC->serv_sock, string);
 299 #endif
 300         FlushStrBuf(WCC->ReadBuf);
 301         WCC->ReadPos = NULL;
 302
 303         serv_write(string, strlen(string));
 304         serv_write("\n", 1);
 305 }
 306
 307 /*
 308  *  send line to server
 309  *  string the line to send to the citadel server
 310  */
 311 void serv_putbuf(const StrBuf *string)
 312 {
 313         wcsession *WCC = WC;
 314 #ifdef SERV_TRACE
 315         lprintf(9, "%3d>>>%s\n", WC->serv_sock, ChrPtr(string));
 316 #endif
 317         FlushStrBuf(WCC->ReadBuf);
 318         WCC->ReadPos = NULL;
 319
 320         serv_write(ChrPtr(string), StrLength(string));
 321         serv_write("\n", 1);
 322 }
 323
 324
 325 /*
 326  *  convenience function to send stuff to the server
 327  *  format the formatstring
 328  *  ... the entities to insert into format
 329  */
 330 void serv_printf(const char *format,...)
 331 {
 332         wcsession *WCC = WC;
 333         va_list arg_ptr;
 334         char buf[SIZ];
 335         size_t len;
 336
 337         FlushStrBuf(WCC->ReadBuf);
 338         WCC->ReadPos = NULL;
 339
 340         va_start(arg_ptr, format);
 341         vsnprintf(buf, sizeof buf, format, arg_ptr);
 342         va_end(arg_ptr);
 343
 344         len = strlen(buf);
 345         buf[len++] = '\n';
 346         buf[len] = '\0';
 347         serv_write(buf, len);
 348 #ifdef SERV_TRACE
 349         lprintf(9, ">>>%s", buf);
 350 #endif
 351 }
 352
 353
 354
 355 /**
 356  * Read binary data from server into memory using a series of
 357  * server READ commands.
 358  * \return the read content as StrBuf
 359  */
 360 int serv_read_binary(StrBuf *Ret, size_t total_len, StrBuf *Buf)
 361 {
 362         wcsession *WCC = WC;
 363         size_t bytes = 0;
 364         size_t thisblock = 0;
 365
 366         if (Ret == NULL)
 367             return -1;
 368
 369         if (MaxRead == -1)
 370         {
 371                 serv_printf("READ %d|"SIZE_T_FMT, 0, total_len);
 372                 if (StrBuf_ServGetln(Buf) > 0)
 373                 {
 374                         long YetRead;
 375                         const char *ErrStr;
 376                         const char *pch;
 377                         int rc;
 378
 379                         if (GetServerStatus(Buf, NULL) == 6)
 380                         {
 381                             StrBufCutLeft(Buf, 4);
 382                             thisblock = StrTol(Buf);
 383                             if (WCC->serv_sock==-1) {
 384                                     FlushStrBuf(Ret);
 385                                     return -1;
 386                             }
 387
 388                             if (WCC->ReadPos != NULL) {
 389                                     pch = ChrPtr(WCC->ReadBuf);
 390
 391                                     YetRead = WCC->ReadPos - pch;
 392                                     if (YetRead > 0)
 393                                     {
 394                                             long StillThere;
 395
 396                                             StillThere = StrLength(WCC->ReadBuf) -
 397                                                     YetRead;
 398
 399                                             StrBufPlain(Ret,
 400                                                         WCC->ReadPos,
 401                                                         StillThere);
 402                                             total_len -= StillThere;
 403                                     }
 404                                     FlushStrBuf(WCC->ReadBuf);
 405                                     WCC->ReadPos = NULL;
 406                             }
 407                             if (total_len > 0)
 408                             {
 409                                     rc = StrBufReadBLOB(Ret,
 410                                                         &WCC->serv_sock,
 411                                                         1,
 412                                                         total_len,
 413                                                         &ErrStr);
 414                                     if (rc < 0)
 415                                     {
 416                                             lprintf(1, "Server connection broken: %s\n",
 417                                                     (ErrStr)?ErrStr:"");
 418                                             wc_backtrace();
 419                                             WCC->serv_sock = (-1);
 420                                             WCC->connected = 0;
 421                                             WCC->logged_in = 0;
 422                                             return rc;
 423                                     }
 424                                     else
 425                                             return StrLength(Ret);
 426                             }
 427                             else
 428                                     return StrLength(Ret);
 429                         }
 430                 }
 431                 else
 432                         return -1;
 433         }
 434         else while ((WCC->serv_sock!=-1) &&
 435                (bytes < total_len)) {
 436                 thisblock = MaxRead;
 437                 if ((total_len - bytes) < thisblock) {
 438                         thisblock = total_len - bytes;
 439                         if (thisblock == 0) {
 440                                 FlushStrBuf(Ret);
 441                                 return -1;
 442                         }
 443                 }
 444                 serv_printf("READ %d|%d", (int)bytes, (int)thisblock);
 445                 if (StrBuf_ServGetln(Buf) > 0)
 446                 {
 447                         if (GetServerStatus(Buf, NULL) == 6)
 448                         {
 449                             StrBufCutLeft(Buf, 4);
 450                             thisblock = StrTol(Buf);
 451                             if (WCC->serv_sock==-1) {
 452                                     FlushStrBuf(Ret);
 453                                     return -1;
 454                             }
 455                             StrBuf_ServGetBLOBBuffered(Ret, thisblock);
 456                             bytes += thisblock;
 457                     }
 458                     else {
 459                             lprintf(3, "Error: %s\n", ChrPtr(Buf) + 4);
 460                             return -1;
 461                     }
 462                 }
 463         }
 464         return StrLength(Ret);
 465 }
 466
 467
 468 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 469 {
 470         const char *Error;
 471 #ifdef HAVE_OPENSSL
 472         const char *pch, *pchs;
 473         int rlen, len, retval = 0;
 474
 475         if (is_https) {
 476                 int ntries = 0;
 477                 if (StrLength(Hdr->ReadBuf) > 0) {
 478                         pchs = ChrPtr(Hdr->ReadBuf);
 479                         pch = strchr(pchs, '\n');
 480                         if (pch != NULL) {
 481                                 rlen = 0;
 482                                 len = pch - pchs;
 483                                 if (len > 0 && (*(pch - 1) == '\r') )
 484                                         rlen ++;
 485                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 486                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 487                                 return len - rlen;
 488                         }
 489                 }
 490
 491                 while (retval == 0) {
 492                                 pch = NULL;
 493                                 pchs = ChrPtr(Hdr->ReadBuf);
 494                                 if (*pchs != '\0')
 495                                         pch = strchr(pchs, '\n');
 496                                 if (pch == NULL) {
 497                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 498                                         pchs = ChrPtr(Hdr->ReadBuf);
 499                                         pch = strchr(pchs, '\n');
 500                                 }
 501                                 if (retval == 0) {
 502                                         sleeeeeeeeeep(1);
 503                                         ntries ++;
 504                                 }
 505                                 if (ntries > 10)
 506                                         return 0;
 507                 }
 508                 if ((retval > 0) && (pch != NULL)) {
 509                         rlen = 0;
 510                         len = pch - pchs;
 511                         if (len > 0 && (*(pch - 1) == '\r') )
 512                                 rlen ++;
 513                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 514                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 515                         return len - rlen;
 516
 517                 }
 518                 else
 519                         return -1;
 520         }
 521         else
 522 #endif
 523                 return StrBufTCP_read_buffered_line_fast(Target,
 524                                                          Hdr->ReadBuf,
 525                                                          &Hdr->Pos,
 526                                                          &Hdr->http_sock,
 527                                                          5,
 528                                                          1,
 529                                                          &Error);
 530 }
 531
 532
 533 /*
 534  * This is a generic function to set up a master socket for listening on
 535  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 536  *
 537  * ip_addr      IP address to bind
 538  * port_number  port number to bind
 539  * queue_len    number of incoming connections to allow in the queue
 540  */
 541 int webcit_tcp_server(char *ip_addr, int port_number, int queue_len)
 542 {
 543         struct protoent *p;
 544         struct sockaddr_in6 sin6;
 545         struct sockaddr_in sin4;
 546         int s, i, b;
 547         int ip_version = 6;
 548
 549         memset(&sin6, 0, sizeof(sin6));
 550         memset(&sin4, 0, sizeof(sin4));
 551         sin6.sin6_family = AF_INET6;
 552         sin4.sin_family = AF_INET;
 553
 554         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 555                 || (IsEmptyStr(ip_addr))
 556                 || (!strcmp(ip_addr, "*"))
 557         ) {
 558                 ip_version = 6;
 559                 sin6.sin6_addr = in6addr_any;
 560         }
 561         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 562         {
 563                 ip_version = 4;
 564                 sin4.sin_addr.s_addr = INADDR_ANY;
 565         }
 566         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 567         {
 568                 ip_version = 4;
 569                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 570                         lprintf(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 571                         return (-WC_EXIT_BIND);
 572                 }
 573         }
 574         else                                                                            /* specific IPv6 */
 575         {
 576                 ip_version = 6;
 577                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 578                         lprintf(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 579                         return (-WC_EXIT_BIND);
 580                 }
 581         }
 582
 583         if (port_number == 0) {
 584                 lprintf(1, "Cannot start: no port number specified.\n");
 585                 return (-WC_EXIT_BIND);
 586         }
 587         sin6.sin6_port = htons((u_short) port_number);
 588         sin4.sin_port = htons((u_short) port_number);
 589
 590         p = getprotobyname("tcp");
 591
 592         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 593         if (s < 0) {
 594                 lprintf(1, "Can't create a listening socket: %s\n", strerror(errno));
 595                 return (-WC_EXIT_BIND);
 596         }
 597         /* Set some socket options that make sense. */
 598         i = 1;
 599         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 600
 601         if (ip_version == 6) {
 602                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 603         }
 604         else {
 605                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 606         }
 607
 608         if (b < 0) {
 609                 lprintf(1, "Can't bind: %s\n", strerror(errno));
 610                 return (-WC_EXIT_BIND);
 611         }
 612
 613         if (listen(s, queue_len) < 0) {
 614                 lprintf(1, "Can't listen: %s\n", strerror(errno));
 615                 return (-WC_EXIT_BIND);
 616         }
 617         return (s);
 618 }
 619
 620
 621 /*
 622  * Create a Unix domain socket and listen on it
 623  * sockpath - file name of the unix domain socket
 624  * queue_len - Number of incoming connections to allow in the queue
 625  */
 626 int webcit_uds_server(char *sockpath, int queue_len)
 627 {
 628         struct sockaddr_un addr;
 629         int s;
 630         int i;
 631         int actual_queue_len;
 632
 633         actual_queue_len = queue_len;
 634         if (actual_queue_len < 5) actual_queue_len = 5;
 635
 636         i = unlink(sockpath);
 637         if ((i != 0) && (errno != ENOENT)) {
 638                 lprintf(1, "webcit: can't unlink %s: %s\n",
 639                         sockpath, strerror(errno));
 640                 return (-WC_EXIT_BIND);
 641         }
 642
 643         memset(&addr, 0, sizeof(addr));
 644         addr.sun_family = AF_UNIX;
 645         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 646
 647         s = socket(AF_UNIX, SOCK_STREAM, 0);
 648         if (s < 0) {
 649                 lprintf(1, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 650                 return (-WC_EXIT_BIND);
 651         }
 652
 653         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 654                 lprintf(1, "webcit: Can't bind: %s\n",
 655                         strerror(errno));
 656                 return (-WC_EXIT_BIND);
 657         }
 658
 659         if (listen(s, actual_queue_len) < 0) {
 660                 lprintf(1, "webcit: Can't listen: %s\n",
 661                         strerror(errno));
 662                 return (-WC_EXIT_BIND);
 663         }
 664
 665         chmod(sockpath, 0777);
 666         return(s);
 667 }
 668
 669
 670
 671
 672 /*
 673  * Read data from the client socket.
 674  *
 675  * sock         socket fd to read from
 676  * buf          buffer to read into
 677  * bytes        number of bytes to read
 678  * timeout      Number of seconds to wait before timing out
 679  *
 680  * Possible return values:
 681  *      1       Requested number of bytes has been read.
 682  *      0       Request timed out.
 683  *      -1      Connection is broken, or other error.
 684  */
 685 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 686 {
 687         const char *Error;
 688         int retval = 0;
 689
 690 #ifdef HAVE_OPENSSL
 691         if (is_https) {
 692                 long bufremain;
 693                 long baselen;
 694
 695                 baselen = StrLength(Target);
 696
 697                 if (Hdr->Pos == NULL)
 698                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 699                 bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 700
 701                 if (bytes < bufremain)
 702                         bufremain = bytes;
 703                 StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 704                 StrBufCutLeft(Hdr->ReadBuf, bufremain);
 705
 706                 if (bytes > bufremain)
 707                 {
 708                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 709                                (retval >= 0))
 710                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 711                         if (retval >= 0) {
 712                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 713 #ifdef HTTP_TRACING
 714                                 write(2, "\033[32m", 5);
 715                                 write(2, buf, bytes);
 716                                 write(2, "\033[30m", 5);
 717 #endif
 718                                 return 1;
 719                         }
 720                         else {
 721                                 lprintf(2, "client_read_ssl() failed\n");
 722                                 return -1;
 723                         }
 724                 }
 725                 else
 726                         return 1;
 727         }
 728 #endif
 729
 730         retval = StrBufReadBLOBBuffered(Target,
 731                                         Hdr->ReadBuf,
 732                                         &Hdr->Pos,
 733                                         &Hdr->http_sock,
 734                                         1,
 735                                         bytes,
 736                                         O_TERM,
 737                                         &Error);
 738         if (retval < 0) {
 739                 lprintf(2, "client_read() failed: %s\n",
 740                         Error);
 741                 wc_backtrace();
 742                 return retval;
 743         }
 744
 745 #ifdef HTTP_TRACING
 746         write(2, "\033[32m", 5);
 747         write(2, buf, bytes);
 748         write(2, "\033[30m", 5);
 749 #endif
 750         return 1;
 751 }
 752
 753
 754 /*
 755  * Begin buffering HTTP output so we can transmit it all in one write operation later.
 756  */
 757 void begin_burst(void)
 758 {
 759         if (WC->WBuf == NULL) {
 760                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 761         }
 762 }
 763
 764
 765 /*
 766  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
 767  */
 768 long end_burst(void)
 769 {
 770         wcsession *WCC = WC;
 771         const char *ptr, *eptr;
 772         long count;
 773         ssize_t res = 0;
 774         fd_set wset;
 775         int fdflags;
 776
 777         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
 778         {
 779                 if (CompressBuffer(WCC->WBuf) > 0)
 780                         hprintf("Content-encoding: gzip\r\n");
 781                 else {
 782                         lprintf(CTDL_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
 783                         wc_backtrace();
 784                 }
 785         }
 786
 787         if (WCC->WFBuf != NULL) {
 788                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
 789                 FreeStrBuf(&WCC->WFBuf);
 790         }
 791
 792         if (WCC->Hdr->HR.prohibit_caching)
 793                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
 794         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
 795
 796         ptr = ChrPtr(WCC->HBuf);
 797         count = StrLength(WCC->HBuf);
 798         eptr = ptr + count;
 799
 800 #ifdef HAVE_OPENSSL
 801         if (is_https) {
 802                 client_write_ssl(WCC->HBuf);
 803                 client_write_ssl(WCC->WBuf);
 804                 return (count);
 805         }
 806 #endif
 807
 808
 809 #ifdef HTTP_TRACING
 810
 811         write(2, "\033[34m", 5);
 812         write(2, ptr, StrLength(WCC->WBuf));
 813         write(2, "\033[30m", 5);
 814 #endif
 815         if (WCC->Hdr->http_sock == -1)
 816                 return -1;
 817         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 818
 819         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
 820                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 821                         FD_ZERO(&wset);
 822                         FD_SET(WCC->Hdr->http_sock, &wset);
 823                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 824                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 825                                 return -1;
 826                         }
 827                 }
 828
 829                 if ((WCC->Hdr->http_sock == -1) ||
 830                     (res = write(WCC->Hdr->http_sock,
 831                                  ptr,
 832                                  count)) == -1) {
 833                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 834                         wc_backtrace();
 835                         return res;
 836                 }
 837                 count -= res;
 838                 ptr += res;
 839         }
 840
 841         ptr = ChrPtr(WCC->WBuf);
 842         count = StrLength(WCC->WBuf);
 843         eptr = ptr + count;
 844
 845 #ifdef HTTP_TRACING
 846
 847         write(2, "\033[34m", 5);
 848         write(2, ptr, StrLength(WCC->WBuf));
 849         write(2, "\033[30m", 5);
 850 #endif
 851
 852         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
 853                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 854                         FD_ZERO(&wset);
 855                         FD_SET(WCC->Hdr->http_sock, &wset);
 856                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 857                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 858                                 return -1;
 859                         }
 860                 }
 861
 862                 if ((WCC->Hdr->http_sock == -1) ||
 863                     (res = write(WCC->Hdr->http_sock,
 864                                  ptr,
 865                                  count)) == -1) {
 866                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 867                         wc_backtrace();
 868                         return res;
 869                 }
 870                 count -= res;
 871                 ptr += res;
 872         }
 873
 874         return StrLength(WCC->WBuf);
 875 }
 876
 877
 878 /*
 879  * lingering_close() a`la Apache. see
 880  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
 881  */
 882 int lingering_close(int fd)
 883 {
 884         char buf[SIZ];
 885         int i;
 886         fd_set set;
 887         struct timeval tv, start;
 888
 889         gettimeofday(&start, NULL);
 890         if (fd == -1)
 891                 return -1;
 892         shutdown(fd, 1);
 893         do {
 894                 do {
 895                         gettimeofday(&tv, NULL);
 896                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
 897                         tv.tv_usec = start.tv_usec - tv.tv_usec;
 898                         if (tv.tv_usec < 0) {
 899                                 tv.tv_sec--;
 900                                 tv.tv_usec += 1000000;
 901                         }
 902                         FD_ZERO(&set);
 903                         FD_SET(fd, &set);
 904                         i = select(fd + 1, &set, NULL, NULL, &tv);
 905                 } while (i == -1 && errno == EINTR);
 906
 907                 if (i <= 0)
 908                         break;
 909
 910                 i = read(fd, buf, sizeof buf);
 911         } while (i != 0 && (i != -1 || errno == EINTR));
 912
 913         return close(fd);
 914 }
 915
 916 void
 917 HttpNewModule_TCPSOCKETS
 918 (ParsedHttpHdrs *httpreq)
 919 {
 920
 921         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
 922 }
 923
 924 void
 925 HttpDetachModule_TCPSOCKETS
 926 (ParsedHttpHdrs *httpreq)
 927 {
 928
 929         FlushStrBuf(httpreq->ReadBuf);
 930         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
 931 }
 932
 933 void
 934 HttpDestroyModule_TCPSOCKETS
 935 (ParsedHttpHdrs *httpreq)
 936 {
 937
 938         FreeStrBuf(&httpreq->ReadBuf);
 939 }
 940
 941
 942 void
 943 SessionNewModule_TCPSOCKETS
 944 (wcsession *sess)
 945 {
 946         sess->CLineBuf = NewStrBuf();
 947         sess->MigrateReadLineBuf = NewStrBuf();
 948 }
 949
 950 void
 951 SessionDestroyModule_TCPSOCKETS
 952 (wcsession *sess)
 953 {
 954         FreeStrBuf(&sess->CLineBuf);
 955         FreeStrBuf(&sess->ReadBuf);
 956         sess->ReadPos = NULL;
 957         FreeStrBuf(&sess->MigrateReadLineBuf);
 958         if (sess->serv_sock > 0)
 959                 close(sess->serv_sock);
 960 }