webcit/tcp_sockets.c

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