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