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