webcit/tcp_sockets.c

   1 /*
   2  * Copyright (c) 1987-2010 by the citadel.org team
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 /*
  20  * Uncomment this to log all communications with the Citadel server
  21 #define SERV_TRACE 1
  22  */
  23
  24
  25 #include "webcit.h"
  26 #include "webserver.h"
  27
  28 extern int DisableGzip;
  29 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         lprintf(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                 lprintf(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                 lprintf(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         lprintf(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                 lprintf(1, "%s: %s\n", host, gai_strerror(rc));
 113                 return(-1);
 114         }
 115
 116         /*
 117          * Try all available addresses until we connect to one or until we run out.
 118          */
 119         for (ai = res; ai != NULL; ai = ai->ai_next) {
 120
 121                 if (ai->ai_family == AF_INET) lprintf(9, "Trying IPv4\n");
 122                 else if (ai->ai_family == AF_INET6) lprintf(9, "Trying IPv6\n");
 123                 else lprintf(9, "This is going to fail.\n");
 124
 125                 s = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 126                 if (s < 0) {
 127                         lprintf(1, "socket() failed: %s\n", strerror(errno));
 128                         return(-1);
 129                 }
 130                 rc = connect(s, ai->ai_addr, ai->ai_addrlen);
 131                 if (rc >= 0) {
 132                         return(s);
 133                 }
 134                 else {
 135                         lprintf(1, "connect() failed: %s\n", strerror(errno));
 136                         close(s);
 137                 }
 138         }
 139
 140         return(-1);
 141 }
 142
 143
 144 /*
 145  *  input string from pipe
 146  */
 147 int serv_getln(char *strbuf, int bufsize)
 148 {
 149         wcsession *WCC = WC;
 150         int len;
 151
 152         *strbuf = '\0';
 153         StrBuf_ServGetln(WCC->MigrateReadLineBuf);
 154         len = StrLength(WCC->MigrateReadLineBuf);
 155         if (len > bufsize)
 156                 len = bufsize - 1;
 157         memcpy(strbuf, ChrPtr(WCC->MigrateReadLineBuf), len);
 158         FlushStrBuf(WCC->MigrateReadLineBuf);
 159         strbuf[len] = '\0';
 160 #ifdef SERV_TRACE
 161         lprintf(9, "%3d<<<%s\n", WC->serv_sock, strbuf);
 162 #endif
 163         return len;
 164 }
 165
 166
 167 int StrBuf_ServGetln(StrBuf *buf)
 168 {
 169         wcsession *WCC = WC;
 170         const char *ErrStr = NULL;
 171         int rc;
 172
 173         FlushStrBuf(buf);
 174         rc = StrBufTCP_read_buffered_line_fast(buf,
 175                                                WCC->ReadBuf,
 176                                                &WCC->ReadPos,
 177                                                &WCC->serv_sock,
 178                                                5, 1,
 179                                                &ErrStr);
 180         if (rc < 0)
 181         {
 182                 lprintf(1, "Server connection broken: %s\n",
 183                         (ErrStr)?ErrStr:"");
 184                 wc_backtrace();
 185                 WCC->serv_sock = (-1);
 186                 WCC->connected = 0;
 187                 WCC->logged_in = 0;
 188         }
 189 #ifdef SERV_TRACE
 190         else
 191         {
 192                 long pos = 0;
 193                 if (WCC->ReadPos != NULL)
 194                         pos = WCC->ReadPos - ChrPtr(WCC->ReadBuf);
 195                 lprintf(9, "%3d<<<[%ld]%s\n", WC->serv_sock, pos, ChrPtr(buf));
 196         }
 197 #endif
 198         return rc;
 199 }
 200
 201 int StrBuf_ServGetBLOBBuffered(StrBuf *buf, long BlobSize)
 202 {
 203         wcsession *WCC = WC;
 204         const char *ErrStr;
 205         int rc;
 206
 207         rc = StrBufReadBLOBBuffered(buf,
 208                                     WCC->ReadBuf,
 209                                     &WCC->ReadPos,
 210                                     &WCC->serv_sock,
 211                                     1,
 212                                     BlobSize,
 213                                     NNN_TERM,
 214                                     &ErrStr);
 215         if (rc < 0)
 216         {
 217                 lprintf(1, "Server connection broken: %s\n",
 218                         (ErrStr)?ErrStr:"");
 219                 wc_backtrace();
 220                 WCC->serv_sock = (-1);
 221                 WCC->connected = 0;
 222                 WCC->logged_in = 0;
 223         }
 224 #ifdef SERV_TRACE
 225         else
 226                 lprintf(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 227 #endif
 228
 229         return rc;
 230 }
 231
 232 int StrBuf_ServGetBLOB(StrBuf *buf, long BlobSize)
 233 {
 234         wcsession *WCC = WC;
 235         const char *ErrStr;
 236         int rc;
 237
 238         WCC->ReadPos = NULL;
 239         rc = StrBufReadBLOB(buf, &WCC->serv_sock, 1, BlobSize, &ErrStr);
 240         if (rc < 0)
 241         {
 242                 lprintf(1, "Server connection broken: %s\n",
 243                         (ErrStr)?ErrStr:"");
 244                 wc_backtrace();
 245                 WCC->serv_sock = (-1);
 246                 WCC->connected = 0;
 247                 WCC->logged_in = 0;
 248         }
 249 #ifdef SERV_TRACE
 250         else
 251                 lprintf(9, "%3d<<<BLOB: %ld bytes\n", WC->serv_sock, StrLength(buf));
 252 #endif
 253
 254         return rc;
 255 }
 256
 257
 258 void FlushReadBuf (void)
 259 {
 260         long len;
 261         const char *pch;
 262         const char *pche;
 263         wcsession *WCC = WC;
 264
 265         len = StrLength(WCC->ReadBuf);
 266         if ((len > 0) &&
 267             (WCC->ReadPos != NULL) &&
 268             (WCC->ReadPos != StrBufNOTNULL))
 269
 270         {
 271                 pch = ChrPtr(WCC->ReadBuf);
 272                 pche = pch + len;
 273                 if (WCC->ReadPos != pche)
 274                 {
 275                         lprintf(1, "ERROR: somebody didn't eat his soup! Remaing Chars: %d [%s]\n",
 276                                 pche - WCC->ReadPos, pche);
 277                         lprintf(1,
 278                                 "--------------------------------------------------------------------------------\n"
 279                                 "Whole buf: [%s]\n"
 280                                 "--------------------------------------------------------------------------------\n",
 281                                 pch);
 282                         AppendImportantMessage(HKEY("Suppenkasper alert! watch your webcit logfile and get connected to your favourite opensource Crew."));
 283                 }
 284         }
 285
 286         FlushStrBuf(WCC->ReadBuf);
 287         WCC->ReadPos = NULL;
 288
 289
 290 }
 291
 292
 293 /*
 294  *  send binary to server
 295  *  buf the buffer to write to citadel server
 296  *  nbytes how many bytes to send to citadel server
 297  */
 298 void serv_write(const char *buf, int nbytes)
 299 {
 300         wcsession *WCC = WC;
 301         int bytes_written = 0;
 302         int retval;
 303
 304         FlushReadBuf();
 305         while (bytes_written < nbytes) {
 306                 retval = write(WCC->serv_sock, &buf[bytes_written],
 307                                nbytes - bytes_written);
 308                 if (retval < 1) {
 309                         const char *ErrStr = strerror(errno);
 310                         lprintf(1, "Server connection broken: %s\n",
 311                                 (ErrStr)?ErrStr:"");
 312                         close(WCC->serv_sock);
 313                         WCC->serv_sock = (-1);
 314                         WCC->connected = 0;
 315                         WCC->logged_in = 0;
 316                         return;
 317                 }
 318                 bytes_written = bytes_written + retval;
 319         }
 320 }
 321
 322
 323 /*
 324  *  send line to server
 325  *  string the line to send to the citadel server
 326  */
 327 void serv_puts(const char *string)
 328 {
 329 #ifdef SERV_TRACE
 330         lprintf(9, "%3d>>>%s\n", WC->serv_sock, string);
 331 #endif
 332         FlushReadBuf();
 333
 334         serv_write(string, strlen(string));
 335         serv_write("\n", 1);
 336 }
 337
 338 /*
 339  *  send line to server
 340  *  string the line to send to the citadel server
 341  */
 342 void serv_putbuf(const StrBuf *string)
 343 {
 344 #ifdef SERV_TRACE
 345         lprintf(9, "%3d>>>%s\n", WC->serv_sock, ChrPtr(string));
 346 #endif
 347         FlushReadBuf();
 348
 349         serv_write(ChrPtr(string), StrLength(string));
 350         serv_write("\n", 1);
 351 }
 352
 353
 354 /*
 355  *  convenience function to send stuff to the server
 356  *  format the formatstring
 357  *  ... the entities to insert into format
 358  */
 359 void serv_printf(const char *format,...)
 360 {
 361         va_list arg_ptr;
 362         char buf[SIZ];
 363         size_t len;
 364
 365         FlushReadBuf();
 366
 367         va_start(arg_ptr, format);
 368         vsnprintf(buf, sizeof buf, format, arg_ptr);
 369         va_end(arg_ptr);
 370
 371         len = strlen(buf);
 372         buf[len++] = '\n';
 373         buf[len] = '\0';
 374         serv_write(buf, len);
 375 #ifdef SERV_TRACE
 376         lprintf(9, ">>>%s", buf);
 377 #endif
 378 }
 379
 380
 381
 382 /**
 383  * Read binary data from server into memory using a series of
 384  * server READ commands.
 385  * \return the read content as StrBuf
 386  */
 387 int serv_read_binary(StrBuf *Ret, size_t total_len, StrBuf *Buf)
 388 {
 389         wcsession *WCC = WC;
 390         size_t bytes = 0;
 391         size_t thisblock = 0;
 392
 393         if (Ret == NULL)
 394             return -1;
 395
 396         if (MaxRead == -1)
 397         {
 398                 serv_printf("READ %d|"SIZE_T_FMT, 0, total_len);
 399                 if (StrBuf_ServGetln(Buf) > 0)
 400                 {
 401                         long YetRead;
 402                         const char *ErrStr;
 403                         const char *pch;
 404                         int rc;
 405
 406                         if (GetServerStatus(Buf, NULL) == 6)
 407                         {
 408                             StrBufCutLeft(Buf, 4);
 409                             thisblock = StrTol(Buf);
 410                             if (WCC->serv_sock==-1) {
 411                                     FlushStrBuf(Ret);
 412                                     return -1;
 413                             }
 414
 415                             if (WCC->ReadPos != NULL) {
 416                                     pch = ChrPtr(WCC->ReadBuf);
 417
 418                                     YetRead = WCC->ReadPos - pch;
 419                                     if (YetRead > 0)
 420                                     {
 421                                             long StillThere;
 422
 423                                             StillThere = StrLength(WCC->ReadBuf) -
 424                                                     YetRead;
 425
 426                                             StrBufPlain(Ret,
 427                                                         WCC->ReadPos,
 428                                                         StillThere);
 429                                             total_len -= StillThere;
 430                                     }
 431                                     FlushStrBuf(WCC->ReadBuf);
 432                                     WCC->ReadPos = NULL;
 433                             }
 434                             if (total_len > 0)
 435                             {
 436                                     rc = StrBufReadBLOB(Ret,
 437                                                         &WCC->serv_sock,
 438                                                         1,
 439                                                         total_len,
 440                                                         &ErrStr);
 441                                     if (rc < 0)
 442                                     {
 443                                             lprintf(1, "Server connection broken: %s\n",
 444                                                     (ErrStr)?ErrStr:"");
 445                                             wc_backtrace();
 446                                             WCC->serv_sock = (-1);
 447                                             WCC->connected = 0;
 448                                             WCC->logged_in = 0;
 449                                             return rc;
 450                                     }
 451                                     else
 452                                             return StrLength(Ret);
 453                             }
 454                             else
 455                                     return StrLength(Ret);
 456                         }
 457                 }
 458                 else
 459                         return -1;
 460         }
 461         else while ((WCC->serv_sock!=-1) &&
 462                (bytes < total_len)) {
 463                 thisblock = MaxRead;
 464                 if ((total_len - bytes) < thisblock) {
 465                         thisblock = total_len - bytes;
 466                         if (thisblock == 0) {
 467                                 FlushStrBuf(Ret);
 468                                 return -1;
 469                         }
 470                 }
 471                 serv_printf("READ %d|%d", (int)bytes, (int)thisblock);
 472                 if (StrBuf_ServGetln(Buf) > 0)
 473                 {
 474                         if (GetServerStatus(Buf, NULL) == 6)
 475                         {
 476                             StrBufCutLeft(Buf, 4);
 477                             thisblock = StrTol(Buf);
 478                             if (WCC->serv_sock==-1) {
 479                                     FlushStrBuf(Ret);
 480                                     return -1;
 481                             }
 482                             StrBuf_ServGetBLOBBuffered(Ret, thisblock);
 483                             bytes += thisblock;
 484                     }
 485                     else {
 486                             lprintf(3, "Error: %s\n", ChrPtr(Buf) + 4);
 487                             return -1;
 488                     }
 489                 }
 490         }
 491         return StrLength(Ret);
 492 }
 493
 494
 495 int ClientGetLine(ParsedHttpHdrs *Hdr, StrBuf *Target)
 496 {
 497         const char *Error;
 498 #ifdef HAVE_OPENSSL
 499         const char *pch, *pchs;
 500         int rlen, len, retval = 0;
 501
 502         if (is_https) {
 503                 int ntries = 0;
 504                 if (StrLength(Hdr->ReadBuf) > 0) {
 505                         pchs = ChrPtr(Hdr->ReadBuf);
 506                         pch = strchr(pchs, '\n');
 507                         if (pch != NULL) {
 508                                 rlen = 0;
 509                                 len = pch - pchs;
 510                                 if (len > 0 && (*(pch - 1) == '\r') )
 511                                         rlen ++;
 512                                 StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 513                                 StrBufCutLeft(Hdr->ReadBuf, len + 1);
 514                                 return len - rlen;
 515                         }
 516                 }
 517
 518                 while (retval == 0) {
 519                                 pch = NULL;
 520                                 pchs = ChrPtr(Hdr->ReadBuf);
 521                                 if (*pchs != '\0')
 522                                         pch = strchr(pchs, '\n');
 523                                 if (pch == NULL) {
 524                                         retval = client_read_sslbuffer(Hdr->ReadBuf, SLEEPING);
 525                                         pchs = ChrPtr(Hdr->ReadBuf);
 526                                         pch = strchr(pchs, '\n');
 527                                 }
 528                                 if (retval == 0) {
 529                                         sleeeeeeeeeep(1);
 530                                         ntries ++;
 531                                 }
 532                                 if (ntries > 10)
 533                                         return 0;
 534                 }
 535                 if ((retval > 0) && (pch != NULL)) {
 536                         rlen = 0;
 537                         len = pch - pchs;
 538                         if (len > 0 && (*(pch - 1) == '\r') )
 539                                 rlen ++;
 540                         StrBufSub(Target, Hdr->ReadBuf, 0, len - rlen);
 541                         StrBufCutLeft(Hdr->ReadBuf, len + 1);
 542                         return len - rlen;
 543
 544                 }
 545                 else
 546                         return -1;
 547         }
 548         else
 549 #endif
 550                 return StrBufTCP_read_buffered_line_fast(Target,
 551                                                          Hdr->ReadBuf,
 552                                                          &Hdr->Pos,
 553                                                          &Hdr->http_sock,
 554                                                          5,
 555                                                          1,
 556                                                          &Error);
 557 }
 558
 559
 560 /*
 561  * This is a generic function to set up a master socket for listening on
 562  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 563  *
 564  * ip_addr      IP address to bind
 565  * port_number  port number to bind
 566  * queue_len    number of incoming connections to allow in the queue
 567  */
 568 int webcit_tcp_server(char *ip_addr, int port_number, int queue_len)
 569 {
 570         struct protoent *p;
 571         struct sockaddr_in6 sin6;
 572         struct sockaddr_in sin4;
 573         int s, i, b;
 574         int ip_version = 6;
 575
 576         memset(&sin6, 0, sizeof(sin6));
 577         memset(&sin4, 0, sizeof(sin4));
 578         sin6.sin6_family = AF_INET6;
 579         sin4.sin_family = AF_INET;
 580
 581         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 582                 || (IsEmptyStr(ip_addr))
 583                 || (!strcmp(ip_addr, "*"))
 584         ) {
 585                 ip_version = 6;
 586                 sin6.sin6_addr = in6addr_any;
 587         }
 588         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 589         {
 590                 ip_version = 4;
 591                 sin4.sin_addr.s_addr = INADDR_ANY;
 592         }
 593         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 594         {
 595                 ip_version = 4;
 596                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 597                         lprintf(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 598                         return (-WC_EXIT_BIND);
 599                 }
 600         }
 601         else                                                                            /* specific IPv6 */
 602         {
 603                 ip_version = 6;
 604                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 605                         lprintf(1, "Error binding to [%s] : %s\n", ip_addr, strerror(errno));
 606                         return (-WC_EXIT_BIND);
 607                 }
 608         }
 609
 610         if (port_number == 0) {
 611                 lprintf(1, "Cannot start: no port number specified.\n");
 612                 return (-WC_EXIT_BIND);
 613         }
 614         sin6.sin6_port = htons((u_short) port_number);
 615         sin4.sin_port = htons((u_short) port_number);
 616
 617         p = getprotobyname("tcp");
 618
 619         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 620         if (s < 0) {
 621                 lprintf(1, "Can't create a listening socket: %s\n", strerror(errno));
 622                 return (-WC_EXIT_BIND);
 623         }
 624         /* Set some socket options that make sense. */
 625         i = 1;
 626         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 627
 628         if (ip_version == 6) {
 629                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 630         }
 631         else {
 632                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 633         }
 634
 635         if (b < 0) {
 636                 lprintf(1, "Can't bind: %s\n", strerror(errno));
 637                 return (-WC_EXIT_BIND);
 638         }
 639
 640         if (listen(s, queue_len) < 0) {
 641                 lprintf(1, "Can't listen: %s\n", strerror(errno));
 642                 return (-WC_EXIT_BIND);
 643         }
 644         return (s);
 645 }
 646
 647
 648 /*
 649  * Create a Unix domain socket and listen on it
 650  * sockpath - file name of the unix domain socket
 651  * queue_len - Number of incoming connections to allow in the queue
 652  */
 653 int webcit_uds_server(char *sockpath, int queue_len)
 654 {
 655         struct sockaddr_un addr;
 656         int s;
 657         int i;
 658         int actual_queue_len;
 659
 660         actual_queue_len = queue_len;
 661         if (actual_queue_len < 5) actual_queue_len = 5;
 662
 663         i = unlink(sockpath);
 664         if ((i != 0) && (errno != ENOENT)) {
 665                 lprintf(1, "webcit: can't unlink %s: %s\n",
 666                         sockpath, strerror(errno));
 667                 return (-WC_EXIT_BIND);
 668         }
 669
 670         memset(&addr, 0, sizeof(addr));
 671         addr.sun_family = AF_UNIX;
 672         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 673
 674         s = socket(AF_UNIX, SOCK_STREAM, 0);
 675         if (s < 0) {
 676                 lprintf(1, "webcit: Can't create a unix domain socket: %s\n", strerror(errno));
 677                 return (-WC_EXIT_BIND);
 678         }
 679
 680         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 681                 lprintf(1, "webcit: Can't bind: %s\n",
 682                         strerror(errno));
 683                 return (-WC_EXIT_BIND);
 684         }
 685
 686         if (listen(s, actual_queue_len) < 0) {
 687                 lprintf(1, "webcit: Can't listen: %s\n",
 688                         strerror(errno));
 689                 return (-WC_EXIT_BIND);
 690         }
 691
 692         chmod(sockpath, 0777);
 693         return(s);
 694 }
 695
 696
 697
 698
 699 /*
 700  * Read data from the client socket.
 701  *
 702  * sock         socket fd to read from
 703  * buf          buffer to read into
 704  * bytes        number of bytes to read
 705  * timeout      Number of seconds to wait before timing out
 706  *
 707  * Possible return values:
 708  *      1       Requested number of bytes has been read.
 709  *      0       Request timed out.
 710  *      -1      Connection is broken, or other error.
 711  */
 712 int client_read_to(ParsedHttpHdrs *Hdr, StrBuf *Target, int bytes, int timeout)
 713 {
 714         const char *Error;
 715         int retval = 0;
 716
 717 #ifdef HAVE_OPENSSL
 718         if (is_https) {
 719                 long bufremain;
 720                 long baselen;
 721
 722                 baselen = StrLength(Target);
 723
 724                 if (Hdr->Pos == NULL)
 725                         Hdr->Pos = ChrPtr(Hdr->ReadBuf);
 726                 bufremain = StrLength(Hdr->ReadBuf) - (Hdr->Pos - ChrPtr(Hdr->ReadBuf));
 727
 728                 if (bytes < bufremain)
 729                         bufremain = bytes;
 730                 StrBufAppendBufPlain(Target, Hdr->Pos, bufremain, 0);
 731                 StrBufCutLeft(Hdr->ReadBuf, bufremain);
 732
 733                 if (bytes > bufremain)
 734                 {
 735                         while ((StrLength(Hdr->ReadBuf) + StrLength(Target) < bytes + baselen) &&
 736                                (retval >= 0))
 737                                 retval = client_read_sslbuffer(Hdr->ReadBuf, timeout);
 738                         if (retval >= 0) {
 739                                 StrBufAppendBuf(Target, Hdr->ReadBuf, 0); /* todo: Buf > bytes? */
 740 #ifdef HTTP_TRACING
 741                                 write(2, "\033[32m", 5);
 742                                 write(2, buf, bytes);
 743                                 write(2, "\033[30m", 5);
 744 #endif
 745                                 return 1;
 746                         }
 747                         else {
 748                                 lprintf(2, "client_read_ssl() failed\n");
 749                                 return -1;
 750                         }
 751                 }
 752                 else
 753                         return 1;
 754         }
 755 #endif
 756
 757         retval = StrBufReadBLOBBuffered(Target,
 758                                         Hdr->ReadBuf,
 759                                         &Hdr->Pos,
 760                                         &Hdr->http_sock,
 761                                         1,
 762                                         bytes,
 763                                         O_TERM,
 764                                         &Error);
 765         if (retval < 0) {
 766                 lprintf(2, "client_read() failed: %s\n",
 767                         Error);
 768                 wc_backtrace();
 769                 return retval;
 770         }
 771
 772 #ifdef HTTP_TRACING
 773         write(2, "\033[32m", 5);
 774         write(2, buf, bytes);
 775         write(2, "\033[30m", 5);
 776 #endif
 777         return 1;
 778 }
 779
 780
 781 /*
 782  * Begin buffering HTTP output so we can transmit it all in one write operation later.
 783  */
 784 void begin_burst(void)
 785 {
 786         if (WC->WBuf == NULL) {
 787                 WC->WBuf = NewStrBufPlain(NULL, 32768);
 788         }
 789 }
 790
 791
 792 /*
 793  * Finish buffering HTTP output.  [Compress using zlib and] output with a Content-Length: header.
 794  */
 795 long end_burst(void)
 796 {
 797         wcsession *WCC = WC;
 798         const char *ptr, *eptr;
 799         long count;
 800         ssize_t res = 0;
 801         fd_set wset;
 802         int fdflags;
 803
 804         if (!DisableGzip && (WCC->Hdr->HR.gzip_ok))
 805         {
 806                 if (CompressBuffer(WCC->WBuf) > 0)
 807                         hprintf("Content-encoding: gzip\r\n");
 808                 else {
 809                         lprintf(CTDL_ALERT, "Compression failed: %d [%s] sending uncompressed\n", errno, strerror(errno));
 810                         wc_backtrace();
 811                 }
 812         }
 813
 814         if (WCC->WFBuf != NULL) {
 815                 WildFireSerializePayload(WCC->WFBuf, WCC->HBuf, &WCC->Hdr->nWildfireHeaders, NULL);
 816                 FreeStrBuf(&WCC->WFBuf);
 817         }
 818
 819         if (WCC->Hdr->HR.prohibit_caching)
 820                 hprintf("Pragma: no-cache\r\nCache-Control: no-store\r\nExpires:-1\r\n");
 821         hprintf("Content-length: %d\r\n\r\n", StrLength(WCC->WBuf));
 822
 823         ptr = ChrPtr(WCC->HBuf);
 824         count = StrLength(WCC->HBuf);
 825         eptr = ptr + count;
 826
 827 #ifdef HAVE_OPENSSL
 828         if (is_https) {
 829                 client_write_ssl(WCC->HBuf);
 830                 client_write_ssl(WCC->WBuf);
 831                 return (count);
 832         }
 833 #endif
 834
 835
 836 #ifdef HTTP_TRACING
 837
 838         write(2, "\033[34m", 5);
 839         write(2, ptr, StrLength(WCC->WBuf));
 840         write(2, "\033[30m", 5);
 841 #endif
 842         if (WCC->Hdr->http_sock == -1)
 843                 return -1;
 844         fdflags = fcntl(WC->Hdr->http_sock, F_GETFL);
 845
 846         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)){
 847                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 848                         FD_ZERO(&wset);
 849                         FD_SET(WCC->Hdr->http_sock, &wset);
 850                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 851                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 852                                 return -1;
 853                         }
 854                 }
 855
 856                 if ((WCC->Hdr->http_sock == -1) ||
 857                     (res = write(WCC->Hdr->http_sock,
 858                                  ptr,
 859                                  count)) == -1) {
 860                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 861                         wc_backtrace();
 862                         return res;
 863                 }
 864                 count -= res;
 865                 ptr += res;
 866         }
 867
 868         ptr = ChrPtr(WCC->WBuf);
 869         count = StrLength(WCC->WBuf);
 870         eptr = ptr + count;
 871
 872 #ifdef HTTP_TRACING
 873
 874         write(2, "\033[34m", 5);
 875         write(2, ptr, StrLength(WCC->WBuf));
 876         write(2, "\033[30m", 5);
 877 #endif
 878
 879         while ((ptr < eptr) && (WCC->Hdr->http_sock != -1)) {
 880                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 881                         FD_ZERO(&wset);
 882                         FD_SET(WCC->Hdr->http_sock, &wset);
 883                         if (select(WCC->Hdr->http_sock + 1, NULL, &wset, NULL, NULL) == -1) {
 884                                 lprintf(2, "client_write: Socket select failed (%s)\n", strerror(errno));
 885                                 return -1;
 886                         }
 887                 }
 888
 889                 if ((WCC->Hdr->http_sock == -1) ||
 890                     (res = write(WCC->Hdr->http_sock,
 891                                  ptr,
 892                                  count)) == -1) {
 893                         lprintf(2, "client_write: Socket write failed (%s)\n", strerror(errno));
 894                         wc_backtrace();
 895                         return res;
 896                 }
 897                 count -= res;
 898                 ptr += res;
 899         }
 900
 901         return StrLength(WCC->WBuf);
 902 }
 903
 904
 905 /*
 906  * lingering_close() a`la Apache. see
 907  * http://www.apache.org/docs/misc/fin_wait_2.html for rationale
 908  */
 909 int lingering_close(int fd)
 910 {
 911         char buf[SIZ];
 912         int i;
 913         fd_set set;
 914         struct timeval tv, start;
 915
 916         gettimeofday(&start, NULL);
 917         if (fd == -1)
 918                 return -1;
 919         shutdown(fd, 1);
 920         do {
 921                 do {
 922                         gettimeofday(&tv, NULL);
 923                         tv.tv_sec = SLEEPING - (tv.tv_sec - start.tv_sec);
 924                         tv.tv_usec = start.tv_usec - tv.tv_usec;
 925                         if (tv.tv_usec < 0) {
 926                                 tv.tv_sec--;
 927                                 tv.tv_usec += 1000000;
 928                         }
 929                         FD_ZERO(&set);
 930                         FD_SET(fd, &set);
 931                         i = select(fd + 1, &set, NULL, NULL, &tv);
 932                 } while (i == -1 && errno == EINTR);
 933
 934                 if (i <= 0)
 935                         break;
 936
 937                 i = read(fd, buf, sizeof buf);
 938         } while (i != 0 && (i != -1 || errno == EINTR));
 939
 940         return close(fd);
 941 }
 942
 943 void
 944 HttpNewModule_TCPSOCKETS
 945 (ParsedHttpHdrs *httpreq)
 946 {
 947
 948         httpreq->ReadBuf = NewStrBufPlain(NULL, SIZ * 4);
 949 }
 950
 951 void
 952 HttpDetachModule_TCPSOCKETS
 953 (ParsedHttpHdrs *httpreq)
 954 {
 955
 956         FlushStrBuf(httpreq->ReadBuf);
 957         ReAdjustEmptyBuf(httpreq->ReadBuf, 4 * SIZ, SIZ);
 958 }
 959
 960 void
 961 HttpDestroyModule_TCPSOCKETS
 962 (ParsedHttpHdrs *httpreq)
 963 {
 964
 965         FreeStrBuf(&httpreq->ReadBuf);
 966 }
 967
 968
 969 void
 970 SessionNewModule_TCPSOCKETS
 971 (wcsession *sess)
 972 {
 973         sess->CLineBuf = NewStrBuf();
 974         sess->MigrateReadLineBuf = NewStrBuf();
 975 }
 976
 977 void
 978 SessionDestroyModule_TCPSOCKETS
 979 (wcsession *sess)
 980 {
 981         FreeStrBuf(&sess->CLineBuf);
 982         FreeStrBuf(&sess->ReadBuf);
 983         sess->ReadPos = NULL;
 984         FreeStrBuf(&sess->MigrateReadLineBuf);
 985         if (sess->serv_sock > 0)
 986                 close(sess->serv_sock);
 987 }