cups/http.c

   1 /*
   2  * "$Id: http.c,v 1.82.2.33 2003/05/09 18:35:37 mike Exp $"
   3  *
   4  *   HTTP routines for the Common UNIX Printing System (CUPS).
   5  *
   6  *   Copyright 1997-2003 by Easy Software Products, all rights reserved.
   7  *
   8  *   These coded instructions, statements, and computer programs are the
   9  *   property of Easy Software Products and are protected by Federal
  10  *   copyright law.  Distribution and use rights are outlined in the file
  11  *   "LICENSE.txt" which should have been included with this file.  If this
  12  *   file is missing or damaged please contact Easy Software Products
  13  *   at:
  14  *
  15  *       Attn: CUPS Licensing Information
  16  *       Easy Software Products
  17  *       44141 Airport View Drive, Suite 204
  18  *       Hollywood, Maryland 20636-3111 USA
  19  *
  20  *       Voice: (301) 373-9603
  21  *       EMail: cups-info@cups.org
  22  *         WWW: http://www.cups.org
  23  *
  24  *   This file is subject to the Apple OS-Developed Software exception.
  25  *
  26  * Contents:
  27  *
  28  *   httpInitialize()     - Initialize the HTTP interface library and set the
  29  *                          default HTTP proxy (if any).
  30  *   httpCheck()          - Check to see if there is a pending response from
  31  *                          the server.
  32  *   httpClearCookie()    - Clear the cookie value(s).
  33  *   httpClose()          - Close an HTTP connection...
  34  *   httpConnect()        - Connect to a HTTP server.
  35  *   httpConnectEncrypt() - Connect to a HTTP server using encryption.
  36  *   httpEncryption()     - Set the required encryption on the link.
  37  *   httpReconnect()      - Reconnect to a HTTP server...
  38  *   httpSetField()       - Set the value of an HTTP header.
  39  *   httpDelete()         - Send a DELETE request to the server.
  40  *   httpGet()            - Send a GET request to the server.
  41  *   httpHead()           - Send a HEAD request to the server.
  42  *   httpOptions()        - Send an OPTIONS request to the server.
  43  *   httpPost()           - Send a POST request to the server.
  44  *   httpPut()            - Send a PUT request to the server.
  45  *   httpTrace()          - Send an TRACE request to the server.
  46  *   httpFlush()          - Flush data from a HTTP connection.
  47  *   httpRead()           - Read data from a HTTP connection.
  48  *   httpSetCookie()      - Set the cookie value(s)...
  49  *   httpWait()           - Wait for data available on a connection.
  50  *   httpWrite()          - Write data to a HTTP connection.
  51  *   httpGets()           - Get a line of text from a HTTP connection.
  52  *   httpPrintf()         - Print a formatted string to a HTTP connection.
  53  *   httpStatus()         - Return a short string describing a HTTP status code.
  54  *   httpGetDateString()  - Get a formatted date/time string from a time value.
  55  *   httpGetDateTime()    - Get a time value from a formatted date/time string.
  56  *   httpUpdate()         - Update the current HTTP state for incoming data.
  57  *   httpDecode64()       - Base64-decode a string.
  58  *   httpEncode64()       - Base64-encode a string.
  59  *   httpGetLength()      - Get the amount of data remaining from the
  60  *                          content-length or transfer-encoding fields.
  61  *   http_field()         - Return the field index for a field name.
  62  *   http_send()          - Send a request with all fields and the trailing
  63  *                          blank line.
  64  *   http_upgrade()       - Force upgrade to TLS encryption.
  65  *   http_setup_ssl()     - Set up SSL/TLS on a connection.
  66  *   http_shutdown_ssl()  - Shut down SSL/TLS on a connection.
  67  *   http_read_ssl()      - Read from a SSL/TLS connection.
  68  *   http_write_ssl()     - Write to a SSL/TLS connection.
  69  *   CDSAReadFunc()       - Read function for CDSA decryption code.
  70  *   CDSAWriteFunc()      - Write function for CDSA encryption code.
  71  */
  72
  73 /*
  74  * Include necessary headers...
  75  */
  76
  77 #include <stdio.h>
  78 #include <stdlib.h>
  79 #include <stdarg.h>
  80 #include <ctype.h>
  81 #include "string.h"
  82 #include <fcntl.h>
  83 #include <errno.h>
  84
  85 #include "http-private.h"
  86 #include "ipp.h"
  87 #include "debug.h"
  88
  89 #ifndef WIN32
  90 #  include <signal.h>
  91 #  include <sys/time.h>
  92 #  include <sys/resource.h>
  93 #endif /* !WIN32 */
  94
  95
  96 /*
  97  * Some operating systems have done away with the Fxxxx constants for
  98  * the fcntl() call; this works around that "feature"...
  99  */
 100
 101 #ifndef FNONBLK
 102 #  define FNONBLK O_NONBLOCK
 103 #endif /* !FNONBLK */
 104
 105
 106 /*
 107  * Local functions...
 108  */
 109
 110 static http_field_t     http_field(const char *name);
 111 static int              http_send(http_t *http, http_state_t request,
 112                                   const char *uri);
 113 #ifdef HAVE_SSL
 114 static int              http_upgrade(http_t *http);
 115 static int              http_setup_ssl(http_t *http);
 116 static void             http_shutdown_ssl(http_t *http);
 117 static int              http_read_ssl(http_t *http, char *buf, int len);
 118 static int              http_write_ssl(http_t *http, const char *buf, int len);
 119 #  ifdef HAVE_CDSASSL
 120 static OSStatus         CDSAReadFunc(SSLConnectionRef connection, void *data, size_t *dataLength);
 121 static OSStatus         CDSAWriteFunc(SSLConnectionRef connection, const void *data, size_t *dataLength);
 122 #  endif /* HAVE_CDSASSL */
 123 #endif /* HAVE_SSL */
 124
 125
 126 /*
 127  * Local globals...
 128  */
 129
 130 static const char * const http_fields[] =
 131                         {
 132                           "Accept-Language",
 133                           "Accept-Ranges",
 134                           "Authorization",
 135                           "Connection",
 136                           "Content-Encoding",
 137                           "Content-Language",
 138                           "Content-Length",
 139                           "Content-Location",
 140                           "Content-MD5",
 141                           "Content-Range",
 142                           "Content-Type",
 143                           "Content-Version",
 144                           "Date",
 145                           "Host",
 146                           "If-Modified-Since",
 147                           "If-Unmodified-since",
 148                           "Keep-Alive",
 149                           "Last-Modified",
 150                           "Link",
 151                           "Location",
 152                           "Range",
 153                           "Referer",
 154                           "Retry-After",
 155                           "Transfer-Encoding",
 156                           "Upgrade",
 157                           "User-Agent",
 158                           "WWW-Authenticate"
 159                         };
 160 static const char * const days[7] =
 161                         {
 162                           "Sun",
 163                           "Mon",
 164                           "Tue",
 165                           "Wed",
 166                           "Thu",
 167                           "Fri",
 168                           "Sat"
 169                         };
 170 static const char * const months[12] =
 171                         {
 172                           "Jan",
 173                           "Feb",
 174                           "Mar",
 175                           "Apr",
 176                           "May",
 177                           "Jun",
 178                           "Jul",
 179                           "Aug",
 180                           "Sep",
 181                           "Oct",
 182                           "Nov",
 183                           "Dec"
 184                         };
 185
 186
 187 /*
 188  * 'httpInitialize()' - Initialize the HTTP interface library and set the
 189  *                      default HTTP proxy (if any).
 190  */
 191
 192 void
 193 httpInitialize(void)
 194 {
 195 #ifdef HAVE_LIBSSL
 196   struct timeval        curtime;        /* Current time in microseconds */
 197   int                   i;              /* Looping var */
 198   unsigned char         data[1024];     /* Seed data */
 199 #endif /* HAVE_LIBSSL */
 200
 201 #ifdef WIN32
 202   WSADATA       winsockdata;    /* WinSock data */
 203   static int    initialized = 0;/* Has WinSock been initialized? */
 204
 205
 206   if (!initialized)
 207     WSAStartup(MAKEWORD(1,1), &winsockdata);
 208 #elif defined(HAVE_SIGSET)
 209   sigset(SIGPIPE, SIG_IGN);
 210 #elif defined(HAVE_SIGACTION)
 211   struct sigaction      action; /* POSIX sigaction data */
 212
 213
 214  /*
 215   * Ignore SIGPIPE signals...
 216   */
 217
 218   memset(&action, 0, sizeof(action));
 219   action.sa_handler = SIG_IGN;
 220   sigaction(SIGPIPE, &action, NULL);
 221 #else
 222   signal(SIGPIPE, SIG_IGN);
 223 #endif /* WIN32 */
 224
 225 #ifdef HAVE_GNUTLS
 226   gnutls_global_init();
 227 #endif /* HAVE_GNUTLS */
 228
 229 #ifdef HAVE_LIBSSL
 230   SSL_load_error_strings();
 231   SSL_library_init();
 232
 233  /*
 234   * Using the current time is a dubious random seed, but on some systems
 235   * it is the best we can do (on others, this seed isn't even used...)
 236   */
 237
 238   gettimeofday(&curtime, NULL);
 239   srand(curtime.tv_sec + curtime.tv_usec);
 240
 241   for (i = 0; i < sizeof(data); i ++)
 242     data[i] = rand(); /* Yes, this is a poor source of random data... */
 243
 244   RAND_seed(&data, sizeof(data));
 245 #endif /* HAVE_LIBSSL */
 246 }
 247
 248
 249 /*
 250  * 'httpCheck()' - Check to see if there is a pending response from the server.
 251  */
 252
 253 int                             /* O - 0 = no data, 1 = data available */
 254 httpCheck(http_t *http)         /* I - HTTP connection */
 255 {
 256   return (httpWait(http, 0));
 257 }
 258
 259
 260 /*
 261  * 'httpClearCookie()' - Clear the cookie value(s).
 262  */
 263
 264 void
 265 httpClearCookie(http_t *http)                   /* I - Connection */
 266 {
 267   if (!http)
 268     return;
 269
 270   if (http->cookie)
 271   {
 272     free(http->cookie);
 273     http->cookie = NULL;
 274   }
 275 }
 276
 277
 278 /*
 279  * 'httpClose()' - Close an HTTP connection...
 280  */
 281
 282 void
 283 httpClose(http_t *http)         /* I - Connection to close */
 284 {
 285   if (!http)
 286     return;
 287
 288   if (http->input_set)
 289     free(http->input_set);
 290
 291   if (http->cookie)
 292     free(http->cookie);
 293
 294 #ifdef HAVE_SSL
 295   if (http->tls)
 296     http_shutdown_ssl(http);
 297 #endif /* HAVE_SSL */
 298
 299 #ifdef WIN32
 300   closesocket(http->fd);
 301 #else
 302   close(http->fd);
 303 #endif /* WIN32 */
 304
 305   free(http);
 306 }
 307
 308
 309 /*
 310  * 'httpConnect()' - Connect to a HTTP server.
 311  */
 312
 313 http_t *                        /* O - New HTTP connection */
 314 httpConnect(const char *host,   /* I - Host to connect to */
 315             int        port)    /* I - Port number */
 316 {
 317   http_encryption_t     encrypt;/* Type of encryption to use */
 318
 319
 320  /*
 321   * Set the default encryption status...
 322   */
 323
 324   if (port == 443)
 325     encrypt = HTTP_ENCRYPT_ALWAYS;
 326   else
 327     encrypt = HTTP_ENCRYPT_IF_REQUESTED;
 328
 329   return (httpConnectEncrypt(host, port, encrypt));
 330 }
 331
 332
 333 /*
 334  * 'httpConnectEncrypt()' - Connect to a HTTP server using encryption.
 335  */
 336
 337 http_t *                                /* O - New HTTP connection */
 338 httpConnectEncrypt(const char *host,    /* I - Host to connect to */
 339                    int        port,     /* I - Port number */
 340                    http_encryption_t encrypt)
 341                                         /* I - Type of encryption to use */
 342 {
 343   int                   i;              /* Looping var */
 344   http_t                *http;          /* New HTTP connection */
 345   struct hostent        *hostaddr;      /* Host address data */
 346
 347
 348   if (host == NULL)
 349     return (NULL);
 350
 351   httpInitialize();
 352
 353  /*
 354   * Lookup the host...
 355   */
 356
 357   if ((hostaddr = httpGetHostByName(host)) == NULL)
 358   {
 359    /*
 360     * This hack to make users that don't have a localhost entry in
 361     * their hosts file or DNS happy...
 362     */
 363
 364     if (strcasecmp(host, "localhost") != 0)
 365       return (NULL);
 366     else if ((hostaddr = httpGetHostByName("127.0.0.1")) == NULL)
 367       return (NULL);
 368   }
 369
 370  /*
 371   * Verify that it is an IPv4 address (IPv6 support will come in CUPS 1.2...)
 372   */
 373
 374 #ifdef AF_INET6
 375   if ((hostaddr->h_addrtype != AF_INET || hostaddr->h_length != 4) &&
 376       (hostaddr->h_addrtype != AF_INET6 || hostaddr->h_length != 16))
 377     return (NULL);
 378 #else
 379   if (hostaddr->h_addrtype != AF_INET || hostaddr->h_length != 4)
 380     return (NULL);
 381 #endif /* AF_INET6 */
 382
 383  /*
 384   * Allocate memory for the structure...
 385   */
 386
 387   http = calloc(sizeof(http_t), 1);
 388   if (http == NULL)
 389     return (NULL);
 390
 391   http->version  = HTTP_1_1;
 392   http->blocking = 1;
 393   http->activity = time(NULL);
 394   http->fd       = -1;
 395
 396  /*
 397   * Set the encryption status...
 398   */
 399
 400   if (port == 443)      /* Always use encryption for https */
 401     http->encryption = HTTP_ENCRYPT_ALWAYS;
 402   else
 403     http->encryption = encrypt;
 404
 405  /*
 406   * Loop through the addresses we have until one of them connects...
 407   */
 408
 409   strlcpy(http->hostname, host, sizeof(http->hostname));
 410
 411   for (i = 0; hostaddr->h_addr_list[i]; i ++)
 412   {
 413    /*
 414     * Load the address...
 415     */
 416
 417     httpAddrLoad(hostaddr, port, i, &(http->hostaddr));
 418
 419    /*
 420     * Connect to the remote system...
 421     */
 422
 423     if (!httpReconnect(http))
 424       break;
 425   }
 426
 427  /*
 428   * Return the new structure if we could connect; otherwise, bail out...
 429   */
 430
 431   if (hostaddr->h_addr_list[i])
 432     return (http);
 433   else
 434   {
 435     free(http);
 436     return (NULL);
 437   }
 438 }
 439
 440
 441 /*
 442  * 'httpEncryption()' - Set the required encryption on the link.
 443  */
 444
 445 int                                     /* O - -1 on error, 0 on success */
 446 httpEncryption(http_t            *http, /* I - HTTP data */
 447                http_encryption_t e)     /* I - New encryption preference */
 448 {
 449 #ifdef HAVE_SSL
 450   if (!http)
 451     return (0);
 452
 453   http->encryption = e;
 454
 455   if ((http->encryption == HTTP_ENCRYPT_ALWAYS && !http->tls) ||
 456       (http->encryption == HTTP_ENCRYPT_NEVER && http->tls))
 457     return (httpReconnect(http));
 458   else if (http->encryption == HTTP_ENCRYPT_REQUIRED && !http->tls)
 459     return (http_upgrade(http));
 460   else
 461     return (0);
 462 #else
 463   if (e == HTTP_ENCRYPT_ALWAYS || e == HTTP_ENCRYPT_REQUIRED)
 464     return (-1);
 465   else
 466     return (0);
 467 #endif /* HAVE_SSL */
 468 }
 469
 470
 471 /*
 472  * 'httpReconnect()' - Reconnect to a HTTP server...
 473  */
 474
 475 int                             /* O - 0 on success, non-zero on failure */
 476 httpReconnect(http_t *http)     /* I - HTTP data */
 477 {
 478   int           val;            /* Socket option value */
 479
 480 #ifdef HAVE_SSL
 481   if (http->tls)
 482     http_shutdown_ssl(http);
 483 #endif /* HAVE_SSL */
 484
 485  /*
 486   * Close any previously open socket...
 487   */
 488
 489   if (http->fd >= 0)
 490 #ifdef WIN32
 491     closesocket(http->fd);
 492 #else
 493     close(http->fd);
 494 #endif /* WIN32 */
 495
 496  /*
 497   * Create the socket and set options to allow reuse.
 498   */
 499
 500   if ((http->fd = socket(http->hostaddr.addr.sa_family, SOCK_STREAM, 0)) < 0)
 501   {
 502 #ifdef WIN32
 503     http->error  = WSAGetLastError();
 504 #else
 505     http->error  = errno;
 506 #endif /* WIN32 */
 507     http->status = HTTP_ERROR;
 508     return (-1);
 509   }
 510
 511 #ifdef FD_CLOEXEC
 512   fcntl(http->fd, F_SETFD, FD_CLOEXEC); /* Close this socket when starting *
 513                                          * other processes...              */
 514 #endif /* FD_CLOEXEC */
 515
 516   val = 1;
 517   setsockopt(http->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 518
 519 #ifdef SO_REUSEPORT
 520   val = 1;
 521   setsockopt(http->fd, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val));
 522 #endif /* SO_REUSEPORT */
 523
 524  /*
 525   * Using TCP_NODELAY improves responsiveness, especially on systems
 526   * with a slow loopback interface...  Since we write large buffers
 527   * when sending print files and requests, there shouldn't be any
 528   * performance penalty for this...
 529   */
 530
 531   val = 1;
 532   setsockopt(http->fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
 533
 534  /*
 535   * Connect to the server...
 536   */
 537
 538 #ifdef AF_INET6
 539   if (connect(http->fd, (struct sockaddr *)&(http->hostaddr),
 540               http->hostaddr.addr.sa_family == AF_INET ?
 541                   sizeof(http->hostaddr.ipv4) :
 542                   sizeof(http->hostaddr.ipv6)) < 0)
 543 #else
 544   if (connect(http->fd, (struct sockaddr *)&(http->hostaddr),
 545               sizeof(http->hostaddr.ipv4)) < 0)
 546 #endif /* AF_INET6 */
 547   {
 548 #ifdef WIN32
 549     http->error  = WSAGetLastError();
 550 #else
 551     http->error  = errno;
 552 #endif /* WIN32 */
 553     http->status = HTTP_ERROR;
 554
 555 #ifdef WIN32
 556     closesocket(http->fd);
 557 #else
 558     close(http->fd);
 559 #endif
 560
 561     http->fd = -1;
 562
 563     return (-1);
 564   }
 565
 566   http->error  = 0;
 567   http->status = HTTP_CONTINUE;
 568
 569 #ifdef HAVE_SSL
 570   if (http->encryption == HTTP_ENCRYPT_ALWAYS)
 571   {
 572    /*
 573     * Always do encryption via SSL.
 574     */
 575
 576     if (http_setup_ssl(http) != 0)
 577     {
 578 #ifdef WIN32
 579       closesocket(http->fd);
 580 #else
 581       close(http->fd);
 582 #endif /* WIN32 */
 583
 584       return (-1);
 585     }
 586   }
 587   else if (http->encryption == HTTP_ENCRYPT_REQUIRED)
 588     return (http_upgrade(http));
 589 #endif /* HAVE_SSL */
 590
 591   return (0);
 592 }
 593
 594
 595 /*
 596  * 'httpGetSubField()' - Get a sub-field value.
 597  */
 598
 599 char *                                  /* O - Value or NULL */
 600 httpGetSubField(http_t       *http,     /* I - HTTP data */
 601                 http_field_t field,     /* I - Field index */
 602                 const char   *name,     /* I - Name of sub-field */
 603                 char         *value)    /* O - Value string */
 604 {
 605   const char    *fptr;                  /* Pointer into field */
 606   char          temp[HTTP_MAX_VALUE],   /* Temporary buffer for name */
 607                 *ptr;                   /* Pointer into string buffer */
 608
 609
 610   if (http == NULL ||
 611       field < HTTP_FIELD_ACCEPT_LANGUAGE ||
 612       field > HTTP_FIELD_WWW_AUTHENTICATE ||
 613       name == NULL || value == NULL)
 614     return (NULL);
 615
 616   for (fptr = http->fields[field]; *fptr;)
 617   {
 618    /*
 619     * Skip leading whitespace...
 620     */
 621
 622     while (isspace(*fptr))
 623       fptr ++;
 624
 625     if (*fptr == ',')
 626     {
 627       fptr ++;
 628       continue;
 629     }
 630
 631    /*
 632     * Get the sub-field name...
 633     */
 634
 635     for (ptr = temp;
 636          *fptr && *fptr != '=' && !isspace(*fptr) && ptr < (temp + sizeof(temp) - 1);
 637          *ptr++ = *fptr++);
 638
 639     *ptr = '\0';
 640
 641    /*
 642     * Skip trailing chars up to the '='...
 643     */
 644
 645     while (*fptr && *fptr != '=')
 646       fptr ++;
 647
 648     if (!*fptr)
 649       break;
 650
 651    /*
 652     * Skip = and leading whitespace...
 653     */
 654
 655     fptr ++;
 656
 657     while (isspace(*fptr))
 658       fptr ++;
 659
 660     if (*fptr == '\"')
 661     {
 662      /*
 663       * Read quoted string...
 664       */
 665
 666       for (ptr = value, fptr ++;
 667            *fptr && *fptr != '\"' && ptr < (value + HTTP_MAX_VALUE - 1);
 668            *ptr++ = *fptr++);
 669
 670       *ptr = '\0';
 671
 672       while (*fptr && *fptr != '\"')
 673         fptr ++;
 674
 675       if (*fptr)
 676         fptr ++;
 677     }
 678     else
 679     {
 680      /*
 681       * Read unquoted string...
 682       */
 683
 684       for (ptr = value;
 685            *fptr && !isspace(*fptr) && *fptr != ',' && ptr < (value + HTTP_MAX_VALUE - 1);
 686            *ptr++ = *fptr++);
 687
 688       *ptr = '\0';
 689
 690       while (*fptr && !isspace(*fptr) && *fptr != ',')
 691         fptr ++;
 692     }
 693
 694    /*
 695     * See if this is the one...
 696     */
 697
 698     if (strcmp(name, temp) == 0)
 699       return (value);
 700   }
 701
 702   value[0] = '\0';
 703
 704   return (NULL);
 705 }
 706
 707
 708 /*
 709  * 'httpSetField()' - Set the value of an HTTP header.
 710  */
 711
 712 void
 713 httpSetField(http_t       *http,        /* I - HTTP data */
 714              http_field_t field,        /* I - Field index */
 715              const char   *value)       /* I - Value */
 716 {
 717   if (http == NULL ||
 718       field < HTTP_FIELD_ACCEPT_LANGUAGE ||
 719       field > HTTP_FIELD_WWW_AUTHENTICATE ||
 720       value == NULL)
 721     return;
 722
 723   strlcpy(http->fields[field], value, HTTP_MAX_VALUE);
 724 }
 725
 726
 727 /*
 728  * 'httpDelete()' - Send a DELETE request to the server.
 729  */
 730
 731 int                                     /* O - Status of call (0 = success) */
 732 httpDelete(http_t     *http,            /* I - HTTP data */
 733            const char *uri)             /* I - URI to delete */
 734 {
 735   return (http_send(http, HTTP_DELETE, uri));
 736 }
 737
 738
 739 /*
 740  * 'httpGet()' - Send a GET request to the server.
 741  */
 742
 743 int                                     /* O - Status of call (0 = success) */
 744 httpGet(http_t     *http,               /* I - HTTP data */
 745         const char *uri)                /* I - URI to get */
 746 {
 747   return (http_send(http, HTTP_GET, uri));
 748 }
 749
 750
 751 /*
 752  * 'httpHead()' - Send a HEAD request to the server.
 753  */
 754
 755 int                                     /* O - Status of call (0 = success) */
 756 httpHead(http_t     *http,              /* I - HTTP data */
 757          const char *uri)               /* I - URI for head */
 758 {
 759   return (http_send(http, HTTP_HEAD, uri));
 760 }
 761
 762
 763 /*
 764  * 'httpOptions()' - Send an OPTIONS request to the server.
 765  */
 766
 767 int                                     /* O - Status of call (0 = success) */
 768 httpOptions(http_t     *http,           /* I - HTTP data */
 769             const char *uri)            /* I - URI for options */
 770 {
 771   return (http_send(http, HTTP_OPTIONS, uri));
 772 }
 773
 774
 775 /*
 776  * 'httpPost()' - Send a POST request to the server.
 777  */
 778
 779 int                                     /* O - Status of call (0 = success) */
 780 httpPost(http_t     *http,              /* I - HTTP data */
 781          const char *uri)               /* I - URI for post */
 782 {
 783   httpGetLength(http);
 784
 785   return (http_send(http, HTTP_POST, uri));
 786 }
 787
 788
 789 /*
 790  * 'httpPut()' - Send a PUT request to the server.
 791  */
 792
 793 int                                     /* O - Status of call (0 = success) */
 794 httpPut(http_t     *http,               /* I - HTTP data */
 795         const char *uri)                /* I - URI to put */
 796 {
 797   httpGetLength(http);
 798
 799   return (http_send(http, HTTP_PUT, uri));
 800 }
 801
 802
 803 /*
 804  * 'httpTrace()' - Send an TRACE request to the server.
 805  */
 806
 807 int                                     /* O - Status of call (0 = success) */
 808 httpTrace(http_t     *http,             /* I - HTTP data */
 809           const char *uri)              /* I - URI for trace */
 810 {
 811   return (http_send(http, HTTP_TRACE, uri));
 812 }
 813
 814
 815 /*
 816  * 'httpFlush()' - Flush data from a HTTP connection.
 817  */
 818
 819 void
 820 httpFlush(http_t *http) /* I - HTTP data */
 821 {
 822   char  buffer[8192];   /* Junk buffer */
 823
 824
 825   if (http->state != HTTP_WAITING)
 826   {
 827     while (httpRead(http, buffer, sizeof(buffer)) > 0);
 828   }
 829 }
 830
 831
 832 /*
 833  * 'httpRead()' - Read data from a HTTP connection.
 834  */
 835
 836 int                                     /* O - Number of bytes read */
 837 httpRead(http_t *http,                  /* I - HTTP data */
 838          char   *buffer,                /* I - Buffer for data */
 839          int    length)                 /* I - Maximum number of bytes */
 840 {
 841   int           bytes;                  /* Bytes read */
 842   char          len[32];                /* Length string */
 843
 844
 845   DEBUG_printf(("httpRead(%p, %p, %d)\n", http, buffer, length));
 846
 847   if (http == NULL || buffer == NULL)
 848     return (-1);
 849
 850   http->activity = time(NULL);
 851
 852   if (length <= 0)
 853     return (0);
 854
 855   if (http->data_encoding == HTTP_ENCODE_CHUNKED &&
 856       http->data_remaining <= 0)
 857   {
 858     DEBUG_puts("httpRead: Getting chunk length...");
 859
 860     if (httpGets(len, sizeof(len), http) == NULL)
 861     {
 862       DEBUG_puts("httpRead: Could not get length!");
 863       return (0);
 864     }
 865
 866     http->data_remaining = strtol(len, NULL, 16);
 867     if (http->data_remaining < 0)
 868     {
 869       DEBUG_puts("httpRead: Negative chunk length!");
 870       return (0);
 871     }
 872   }
 873
 874   DEBUG_printf(("httpRead: data_remaining = %d\n", http->data_remaining));
 875
 876   if (http->data_remaining <= 0)
 877   {
 878    /*
 879     * A zero-length chunk ends a transfer; unless we are reading POST
 880     * data, go idle...
 881     */
 882
 883     if (http->data_encoding == HTTP_ENCODE_CHUNKED)
 884       httpGets(len, sizeof(len), http);
 885
 886     if (http->state == HTTP_POST_RECV)
 887       http->state ++;
 888     else
 889       http->state = HTTP_WAITING;
 890
 891     return (0);
 892   }
 893   else if (length > http->data_remaining)
 894     length = http->data_remaining;
 895
 896   if (http->used == 0 && length <= 256)
 897   {
 898    /*
 899     * Buffer small reads for better performance...
 900     */
 901
 902     if (!http->blocking && !httpWait(http, 1000))
 903       return (0);
 904
 905     if (http->data_remaining > sizeof(http->buffer))
 906       bytes = sizeof(http->buffer);
 907     else
 908       bytes = http->data_remaining;
 909
 910 #ifdef HAVE_SSL
 911     if (http->tls)
 912       bytes = http_read_ssl(http, http->buffer, bytes);
 913     else
 914 #endif /* HAVE_SSL */
 915     {
 916       DEBUG_printf(("httpRead: reading %d bytes from socket into buffer...\n",
 917                     bytes));
 918
 919       bytes = recv(http->fd, http->buffer, bytes, 0);
 920
 921       DEBUG_printf(("httpRead: read %d bytes from socket into buffer...\n",
 922                     bytes));
 923     }
 924
 925     if (bytes > 0)
 926       http->used = bytes;
 927     else if (bytes < 0)
 928     {
 929 #ifdef WIN32
 930       http->error = WSAGetLastError();
 931       return (-1);
 932 #else
 933       if (errno != EINTR)
 934       {
 935         http->error = errno;
 936         return (-1);
 937       }
 938 #endif /* WIN32 */
 939     }
 940     else
 941     {
 942       http->error = EPIPE;
 943       return (0);
 944     }
 945   }
 946
 947   if (http->used > 0)
 948   {
 949     if (length > http->used)
 950       length = http->used;
 951
 952     bytes = length;
 953
 954     DEBUG_printf(("httpRead: grabbing %d bytes from input buffer...\n", bytes));
 955
 956     memcpy(buffer, http->buffer, length);
 957     http->used -= length;
 958
 959     if (http->used > 0)
 960       memmove(http->buffer, http->buffer + length, http->used);
 961   }
 962 #ifdef HAVE_SSL
 963   else if (http->tls)
 964     bytes = http_read_ssl(http, buffer, length);
 965 #endif /* HAVE_SSL */
 966   else
 967   {
 968     if (!http->blocking && !httpWait(http, 1000))
 969       return (0);
 970
 971     DEBUG_printf(("httpRead: reading %d bytes from socket...\n", length));
 972     bytes = recv(http->fd, buffer, length, 0);
 973     DEBUG_printf(("httpRead: read %d bytes from socket...\n", bytes));
 974   }
 975
 976   if (bytes > 0)
 977     http->data_remaining -= bytes;
 978   else if (bytes < 0)
 979   {
 980 #ifdef WIN32
 981     http->error = WSAGetLastError();
 982 #else
 983     if (errno == EINTR)
 984       bytes = 0;
 985     else
 986       http->error = errno;
 987 #endif /* WIN32 */
 988   }
 989   else
 990   {
 991     http->error = EPIPE;
 992     return (0);
 993   }
 994
 995   if (http->data_remaining == 0)
 996   {
 997     if (http->data_encoding == HTTP_ENCODE_CHUNKED)
 998       httpGets(len, sizeof(len), http);
 999
1000     if (http->data_encoding != HTTP_ENCODE_CHUNKED)
1001     {
1002       if (http->state == HTTP_POST_RECV)
1003         http->state ++;
1004       else
1005         http->state = HTTP_WAITING;
1006     }
1007   }
1008
1009 #ifdef DEBUG
1010   {
1011     int i, j, ch;
1012     printf("httpRead: Read %d bytes:\n", bytes);
1013     for (i = 0; i < bytes; i += 16)
1014     {
1015       printf("   ");
1016
1017       for (j = 0; j < 16 && (i + j) < bytes; j ++)
1018         printf(" %02X", buffer[i + j] & 255);
1019
1020       while (j < 16)
1021       {
1022         printf("   ");
1023         j ++;
1024       }
1025
1026       printf("    ");
1027       for (j = 0; j < 16 && (i + j) < bytes; j ++)
1028       {
1029         ch = buffer[i + j] & 255;
1030
1031         if (ch < ' ' || ch == 127)
1032           ch = '.';
1033
1034         putchar(ch);
1035       }
1036       putchar('\n');
1037     }
1038   }
1039 #endif /* DEBUG */
1040
1041   return (bytes);
1042 }
1043
1044
1045 /*
1046  * 'httpSetCookie()' - Set the cookie value(s)...
1047  */
1048
1049 void
1050 httpSetCookie(http_t     *http,                 /* I - Connection */
1051               const char *cookie)               /* I - Cookie string */
1052 {
1053   if (!http)
1054     return;
1055
1056   if (http->cookie)
1057     free(http->cookie);
1058
1059   if (cookie)
1060     http->cookie = strdup(cookie);
1061   else
1062     http->cookie = NULL;
1063 }
1064
1065
1066 /*
1067  * 'httpWait()' - Wait for data available on a connection.
1068  */
1069
1070 int                                     /* O - 1 if data is available, 0 otherwise */
1071 httpWait(http_t *http,                  /* I - HTTP data */
1072          int    msec)                   /* I - Milliseconds to wait */
1073 {
1074 #ifndef WIN32
1075   struct rlimit         limit;          /* Runtime limit */
1076 #endif /* !WIN32 */
1077   struct timeval        timeout;        /* Timeout */
1078   int                   nfds;           /* Result from select() */
1079
1080
1081  /*
1082   * First see if there is data in the buffer...
1083   */
1084
1085   if (http == NULL)
1086     return (0);
1087
1088   if (http->used)
1089     return (1);
1090
1091  /*
1092   * Then try doing a select() to poll the socket...
1093   */
1094
1095   if (!http->input_set)
1096   {
1097 #ifdef WIN32
1098    /*
1099     * Windows has a fixed-size select() structure, different (surprise,
1100     * surprise!) from all UNIX implementations.  Just allocate this
1101     * fixed structure...
1102     */
1103
1104     http->input_set = calloc(1, sizeof(fd_set));
1105 #else
1106    /*
1107     * Allocate the select() input set based upon the max number of file
1108     * descriptors available for this process...
1109     */
1110
1111     getrlimit(RLIMIT_NOFILE, &limit);
1112
1113     http->input_set = calloc(1, (limit.rlim_cur + 7) / 8);
1114 #endif /* WIN32 */
1115
1116     if (!http->input_set)
1117       return (0);
1118   }
1119
1120   FD_SET(http->fd, http->input_set);
1121
1122   if (msec >= 0)
1123   {
1124     timeout.tv_sec  = msec / 1000;
1125     timeout.tv_usec = (msec % 1000) * 1000;
1126
1127     nfds = select(http->fd + 1, http->input_set, NULL, NULL, &timeout);
1128   }
1129   else
1130     nfds = select(http->fd + 1, http->input_set, NULL, NULL, NULL);
1131
1132   FD_CLR(http->fd, http->input_set);
1133
1134   return (nfds > 0);
1135 }
1136
1137
1138 /*
1139  * 'httpWrite()' - Write data to a HTTP connection.
1140  */
1141
1142 int                                     /* O - Number of bytes written */
1143 httpWrite(http_t     *http,             /* I - HTTP data */
1144           const char *buffer,           /* I - Buffer for data */
1145           int        length)            /* I - Number of bytes to write */
1146 {
1147   int   tbytes,                         /* Total bytes sent */
1148         bytes;                          /* Bytes sent */
1149
1150
1151   if (http == NULL || buffer == NULL)
1152     return (-1);
1153
1154   http->activity = time(NULL);
1155
1156   if (http->data_encoding == HTTP_ENCODE_CHUNKED)
1157   {
1158     if (httpPrintf(http, "%x\r\n", length) < 0)
1159       return (-1);
1160
1161     if (length == 0)
1162     {
1163      /*
1164       * A zero-length chunk ends a transfer; unless we are sending POST
1165       * data, go idle...
1166       */
1167
1168       DEBUG_puts("httpWrite: changing states...");
1169
1170       if (http->state == HTTP_POST_RECV)
1171         http->state ++;
1172       else if (http->state == HTTP_PUT_RECV)
1173         http->state = HTTP_STATUS;
1174       else
1175         http->state = HTTP_WAITING;
1176
1177       if (httpPrintf(http, "\r\n") < 0)
1178         return (-1);
1179
1180       return (0);
1181     }
1182   }
1183
1184   tbytes = 0;
1185
1186   while (length > 0)
1187   {
1188 #ifdef HAVE_SSL
1189     if (http->tls)
1190       bytes = http_write_ssl(http, buffer, length);
1191     else
1192 #endif /* HAVE_SSL */
1193     bytes = send(http->fd, buffer, length, 0);
1194
1195     if (bytes < 0)
1196     {
1197 #ifdef WIN32
1198       if (WSAGetLastError() != http->error)
1199       {
1200         http->error = WSAGetLastError();
1201         continue;
1202       }
1203 #else
1204       if (errno == EINTR)
1205         continue;
1206       else if (errno != http->error)
1207       {
1208         http->error = errno;
1209         continue;
1210       }
1211 #endif /* WIN32 */
1212
1213       DEBUG_puts("httpWrite: error writing data...\n");
1214
1215       return (-1);
1216     }
1217
1218     buffer += bytes;
1219     tbytes += bytes;
1220     length -= bytes;
1221     if (http->data_encoding == HTTP_ENCODE_LENGTH)
1222       http->data_remaining -= bytes;
1223   }
1224
1225   if (http->data_encoding == HTTP_ENCODE_CHUNKED)
1226     if (httpPrintf(http, "\r\n") < 0)
1227       return (-1);
1228
1229   if (http->data_remaining == 0 && http->data_encoding == HTTP_ENCODE_LENGTH)
1230   {
1231    /*
1232     * Finished with the transfer; unless we are sending POST data, go idle...
1233     */
1234
1235     DEBUG_puts("httpWrite: changing states...");
1236
1237     if (http->state == HTTP_POST_RECV)
1238       http->state ++;
1239     else
1240       http->state = HTTP_WAITING;
1241   }
1242
1243 #ifdef DEBUG
1244   {
1245     int i, j, ch;
1246     printf("httpWrite: wrote %d bytes: \n", tbytes);
1247     for (i = 0, buffer -= tbytes; i < tbytes; i += 16)
1248     {
1249       printf("   ");
1250
1251       for (j = 0; j < 16 && (i + j) < tbytes; j ++)
1252         printf(" %02X", buffer[i + j] & 255);
1253
1254       while (j < 16)
1255       {
1256         printf("   ");
1257         j ++;
1258       }
1259
1260       printf("    ");
1261       for (j = 0; j < 16 && (i + j) < tbytes; j ++)
1262       {
1263         ch = buffer[i + j] & 255;
1264
1265         if (ch < ' ' || ch == 127)
1266           ch = '.';
1267
1268         putchar(ch);
1269       }
1270       putchar('\n');
1271     }
1272   }
1273 #endif /* DEBUG */
1274   return (tbytes);
1275 }
1276
1277
1278 /*
1279  * 'httpGets()' - Get a line of text from a HTTP connection.
1280  */
1281
1282 char *                                  /* O - Line or NULL */
1283 httpGets(char   *line,                  /* I - Line to read into */
1284          int    length,                 /* I - Max length of buffer */
1285          http_t *http)                  /* I - HTTP data */
1286 {
1287   char  *lineptr,                       /* Pointer into line */
1288         *bufptr,                        /* Pointer into input buffer */
1289         *bufend;                        /* Pointer to end of buffer */
1290   int   bytes;                          /* Number of bytes read */
1291
1292
1293   DEBUG_printf(("httpGets(%p, %d, %p)\n", line, length, http));
1294
1295   if (http == NULL || line == NULL)
1296     return (NULL);
1297
1298  /*
1299   * Pre-scan the buffer and see if there is a newline in there...
1300   */
1301
1302 #ifdef WIN32
1303   WSASetLastError(0);
1304 #else
1305   errno = 0;
1306 #endif /* WIN32 */
1307
1308   do
1309   {
1310     bufptr  = http->buffer;
1311     bufend  = http->buffer + http->used;
1312
1313     while (bufptr < bufend)
1314       if (*bufptr == 0x0a)
1315         break;
1316       else
1317         bufptr ++;
1318
1319     if (bufptr >= bufend && http->used < HTTP_MAX_BUFFER)
1320     {
1321      /*
1322       * No newline; see if there is more data to be read...
1323       */
1324
1325 #ifdef HAVE_SSL
1326       if (http->tls)
1327         bytes = http_read_ssl(http, bufend, HTTP_MAX_BUFFER - http->used);
1328       else
1329 #endif /* HAVE_SSL */
1330       if (!http->blocking && !httpWait(http, 1000))
1331         return (NULL);
1332       else
1333         bytes = recv(http->fd, bufend, HTTP_MAX_BUFFER - http->used, 0);
1334
1335       if (bytes < 0)
1336       {
1337        /*
1338         * Nope, can't get a line this time...
1339         */
1340
1341 #ifdef WIN32
1342         if (WSAGetLastError() != http->error)
1343         {
1344           http->error = WSAGetLastError();
1345           continue;
1346         }
1347
1348         DEBUG_printf(("httpGets(): recv() error %d!\n", WSAGetLastError()));
1349 #else
1350         if (errno == EINTR)
1351           continue;
1352         else if (errno != http->error)
1353         {
1354           http->error = errno;
1355           continue;
1356         }
1357
1358         DEBUG_printf(("httpGets(): recv() error %d!\n", errno));
1359 #endif /* WIN32 */
1360
1361         return (NULL);
1362       }
1363       else if (bytes == 0)
1364       {
1365         http->error = EPIPE;
1366
1367         return (NULL);
1368       }
1369
1370      /*
1371       * Yup, update the amount used and the end pointer...
1372       */
1373
1374       http->used += bytes;
1375       bufend     += bytes;
1376       bufptr     = bufend;
1377     }
1378   }
1379   while (bufptr >= bufend && http->used < HTTP_MAX_BUFFER);
1380
1381   http->activity = time(NULL);
1382
1383  /*
1384   * Read a line from the buffer...
1385   */
1386
1387   lineptr = line;
1388   bufptr  = http->buffer;
1389   bytes   = 0;
1390   length --;
1391
1392   while (bufptr < bufend && bytes < length)
1393   {
1394     bytes ++;
1395
1396     if (*bufptr == 0x0a)
1397     {
1398       bufptr ++;
1399       break;
1400     }
1401     else if (*bufptr == 0x0d)
1402       bufptr ++;
1403     else
1404       *lineptr++ = *bufptr++;
1405   }
1406
1407   if (bytes > 0)
1408   {
1409     *lineptr = '\0';
1410
1411     http->used -= bytes;
1412     if (http->used > 0)
1413       memmove(http->buffer, bufptr, http->used);
1414
1415     DEBUG_printf(("httpGets(): Returning \"%s\"\n", line));
1416     return (line);
1417   }
1418
1419   DEBUG_puts("httpGets(): No new line available!");
1420
1421   return (NULL);
1422 }
1423
1424
1425 /*
1426  * 'httpPrintf()' - Print a formatted string to a HTTP connection.
1427  */
1428
1429 int                                     /* O - Number of bytes written */
1430 httpPrintf(http_t     *http,            /* I - HTTP data */
1431            const char *format,          /* I - printf-style format string */
1432            ...)                         /* I - Additional args as needed */
1433 {
1434   int           bytes,                  /* Number of bytes to write */
1435                 nbytes,                 /* Number of bytes written */
1436                 tbytes;                 /* Number of bytes all together */
1437   char          buf[HTTP_MAX_BUFFER],   /* Buffer for formatted string */
1438                 *bufptr;                /* Pointer into buffer */
1439   va_list       ap;                     /* Variable argument pointer */
1440
1441
1442   va_start(ap, format);
1443   bytes = vsnprintf(buf, sizeof(buf), format, ap);
1444   va_end(ap);
1445
1446   DEBUG_printf(("httpPrintf: %s", buf));
1447
1448   for (tbytes = 0, bufptr = buf; tbytes < bytes; tbytes += nbytes, bufptr += nbytes)
1449   {
1450 #ifdef HAVE_SSL
1451     if (http->tls)
1452       nbytes = http_write_ssl(http, bufptr, bytes - tbytes);
1453     else
1454 #endif /* HAVE_SSL */
1455     nbytes = send(http->fd, bufptr, bytes - tbytes, 0);
1456
1457     if (nbytes < 0)
1458     {
1459       nbytes = 0;
1460
1461 #ifdef WIN32
1462       if (WSAGetLastError() != http->error)
1463       {
1464         http->error = WSAGetLastError();
1465         continue;
1466       }
1467 #else
1468       if (errno == EINTR)
1469         continue;
1470       else if (errno != http->error)
1471       {
1472         http->error = errno;
1473         continue;
1474       }
1475 #endif /* WIN32 */
1476
1477       return (-1);
1478     }
1479   }
1480
1481   return (bytes);
1482 }
1483
1484
1485 /*
1486  * 'httpStatus()' - Return a short string describing a HTTP status code.
1487  */
1488
1489 const char *                            /* O - String or NULL */
1490 httpStatus(http_status_t status)        /* I - HTTP status code */
1491 {
1492   switch (status)
1493   {
1494     case HTTP_CONTINUE :
1495         return ("Continue");
1496     case HTTP_SWITCHING_PROTOCOLS :
1497         return ("Switching Protocols");
1498     case HTTP_OK :
1499         return ("OK");
1500     case HTTP_CREATED :
1501         return ("Created");
1502     case HTTP_ACCEPTED :
1503         return ("Accepted");
1504     case HTTP_NO_CONTENT :
1505         return ("No Content");
1506     case HTTP_NOT_MODIFIED :
1507         return ("Not Modified");
1508     case HTTP_BAD_REQUEST :
1509         return ("Bad Request");
1510     case HTTP_UNAUTHORIZED :
1511         return ("Unauthorized");
1512     case HTTP_FORBIDDEN :
1513         return ("Forbidden");
1514     case HTTP_NOT_FOUND :
1515         return ("Not Found");
1516     case HTTP_REQUEST_TOO_LARGE :
1517         return ("Request Entity Too Large");
1518     case HTTP_URI_TOO_LONG :
1519         return ("URI Too Long");
1520     case HTTP_UPGRADE_REQUIRED :
1521         return ("Upgrade Required");
1522     case HTTP_NOT_IMPLEMENTED :
1523         return ("Not Implemented");
1524     case HTTP_NOT_SUPPORTED :
1525         return ("Not Supported");
1526     default :
1527         return ("Unknown");
1528   }
1529 }
1530
1531
1532 /*
1533  * 'httpGetDateString()' - Get a formatted date/time string from a time value.
1534  */
1535
1536 const char *                            /* O - Date/time string */
1537 httpGetDateString(time_t t)             /* I - UNIX time */
1538 {
1539   struct tm     *tdate;
1540   static char   datetime[256];
1541
1542
1543   tdate = gmtime(&t);
1544   snprintf(datetime, sizeof(datetime), "%s, %02d %s %d %02d:%02d:%02d GMT",
1545            days[tdate->tm_wday], tdate->tm_mday, months[tdate->tm_mon],
1546            tdate->tm_year + 1900, tdate->tm_hour, tdate->tm_min, tdate->tm_sec);
1547
1548   return (datetime);
1549 }
1550
1551
1552 /*
1553  * 'httpGetDateTime()' - Get a time value from a formatted date/time string.
1554  */
1555
1556 time_t                                  /* O - UNIX time */
1557 httpGetDateTime(const char *s)          /* I - Date/time string */
1558 {
1559   int           i;                      /* Looping var */
1560   struct tm     tdate;                  /* Time/date structure */
1561   char          mon[16];                /* Abbreviated month name */
1562   int           day, year;              /* Day of month and year */
1563   int           hour, min, sec;         /* Time */
1564
1565
1566   if (sscanf(s, "%*s%d%15s%d%d:%d:%d", &day, mon, &year, &hour, &min, &sec) < 6)
1567     return (0);
1568
1569   for (i = 0; i < 12; i ++)
1570     if (strcasecmp(mon, months[i]) == 0)
1571       break;
1572
1573   if (i >= 12)
1574     return (0);
1575
1576   tdate.tm_mon   = i;
1577   tdate.tm_mday  = day;
1578   tdate.tm_year  = year - 1900;
1579   tdate.tm_hour  = hour;
1580   tdate.tm_min   = min;
1581   tdate.tm_sec   = sec;
1582   tdate.tm_isdst = 0;
1583
1584   return (mktime(&tdate));
1585 }
1586
1587
1588 /*
1589  * 'httpUpdate()' - Update the current HTTP state for incoming data.
1590  */
1591
1592 http_status_t                           /* O - HTTP status */
1593 httpUpdate(http_t *http)                /* I - HTTP data */
1594 {
1595   char          line[1024],             /* Line from connection... */
1596                 *value;                 /* Pointer to value on line */
1597   http_field_t  field;                  /* Field index */
1598   int           major, minor;           /* HTTP version numbers */
1599   http_status_t status;                 /* Authorization status */
1600
1601
1602   DEBUG_printf(("httpUpdate(%p)\n", http));
1603
1604  /*
1605   * If we haven't issued any commands, then there is nothing to "update"...
1606   */
1607
1608   if (http->state == HTTP_WAITING)
1609     return (HTTP_CONTINUE);
1610
1611  /*
1612   * Grab all of the lines we can from the connection...
1613   */
1614
1615   while (httpGets(line, sizeof(line), http) != NULL)
1616   {
1617     DEBUG_puts(line);
1618
1619     if (line[0] == '\0')
1620     {
1621      /*
1622       * Blank line means the start of the data section (if any).  Return
1623       * the result code, too...
1624       *
1625       * If we get status 100 (HTTP_CONTINUE), then we *don't* change states.
1626       * Instead, we just return HTTP_CONTINUE to the caller and keep on
1627       * tryin'...
1628       */
1629
1630       if (http->status == HTTP_CONTINUE)
1631         return (http->status);
1632
1633 #ifdef HAVE_SSL
1634       if (http->status == HTTP_SWITCHING_PROTOCOLS && !http->tls)
1635       {
1636         if (http_setup_ssl(http) != 0)
1637         {
1638 #  ifdef WIN32
1639           closesocket(http->fd);
1640 #  else
1641           close(http->fd);
1642 #  endif /* WIN32 */
1643
1644           return (HTTP_ERROR);
1645         }
1646
1647         return (HTTP_CONTINUE);
1648       }
1649       else if (http->status == HTTP_UPGRADE_REQUIRED &&
1650                http->encryption != HTTP_ENCRYPT_NEVER)
1651         http->encryption = HTTP_ENCRYPT_REQUIRED;
1652 #endif /* HAVE_SSL */
1653
1654       httpGetLength(http);
1655
1656       switch (http->state)
1657       {
1658         case HTTP_GET :
1659         case HTTP_POST :
1660         case HTTP_POST_RECV :
1661         case HTTP_PUT :
1662             http->state ++;
1663         case HTTP_POST_SEND :
1664             break;
1665
1666         default :
1667             http->state = HTTP_WAITING;
1668             break;
1669       }
1670
1671       return (http->status);
1672     }
1673     else if (strncmp(line, "HTTP/", 5) == 0)
1674     {
1675      /*
1676       * Got the beginning of a response...
1677       */
1678
1679       if (sscanf(line, "HTTP/%d.%d%d", &major, &minor, (int *)&status) != 3)
1680         return (HTTP_ERROR);
1681
1682       http->version = (http_version_t)(major * 100 + minor);
1683       http->status  = status;
1684     }
1685     else if ((value = strchr(line, ':')) != NULL)
1686     {
1687      /*
1688       * Got a value...
1689       */
1690
1691       *value++ = '\0';
1692       while (isspace(*value))
1693         value ++;
1694
1695      /*
1696       * Be tolerants of servers that send unknown attribute fields...
1697       */
1698
1699       if (!strcasecmp(line, "expect"))
1700       {
1701        /*
1702         * "Expect: 100-continue" or similar...
1703         */
1704
1705         http->expect = (http_status_t)atoi(value);
1706       }
1707       else if (!strcasecmp(line, "cookie"))
1708       {
1709        /*
1710         * "Cookie: name=value[; name=value ...]" - replaces previous cookies...
1711         */
1712
1713         httpSetCookie(http, value);
1714       }
1715       else if ((field = http_field(line)) == HTTP_FIELD_UNKNOWN)
1716       {
1717         DEBUG_printf(("httpUpdate: unknown field %s seen!\n", line));
1718         continue;
1719       }
1720       else
1721         httpSetField(http, field, value);
1722     }
1723     else
1724     {
1725       http->status = HTTP_ERROR;
1726       return (HTTP_ERROR);
1727     }
1728   }
1729
1730  /*
1731   * See if there was an error...
1732   */
1733
1734   if (http->error)
1735   {
1736     http->status = HTTP_ERROR;
1737     return (HTTP_ERROR);
1738   }
1739
1740  /*
1741   * If we haven't already returned, then there is nothing new...
1742   */
1743
1744   return (HTTP_CONTINUE);
1745 }
1746
1747
1748 /*
1749  * 'httpDecode64()' - Base64-decode a string.
1750  */
1751
1752 char *                          /* O - Decoded string */
1753 httpDecode64(char       *out,   /* I - String to write to */
1754              const char *in)    /* I - String to read from */
1755 {
1756   int   pos,                    /* Bit position */
1757         base64;                 /* Value of this character */
1758   char  *outptr;                /* Output pointer */
1759
1760
1761   for (outptr = out, pos = 0; *in != '\0'; in ++)
1762   {
1763    /*
1764     * Decode this character into a number from 0 to 63...
1765     */
1766
1767     if (*in >= 'A' && *in <= 'Z')
1768       base64 = *in - 'A';
1769     else if (*in >= 'a' && *in <= 'z')
1770       base64 = *in - 'a' + 26;
1771     else if (*in >= '0' && *in <= '9')
1772       base64 = *in - '0' + 52;
1773     else if (*in == '+')
1774       base64 = 62;
1775     else if (*in == '/')
1776       base64 = 63;
1777     else if (*in == '=')
1778       break;
1779     else
1780       continue;
1781
1782    /*
1783     * Store the result in the appropriate chars...
1784     */
1785
1786     switch (pos)
1787     {
1788       case 0 :
1789           *outptr = base64 << 2;
1790           pos ++;
1791           break;
1792       case 1 :
1793           *outptr++ |= (base64 >> 4) & 3;
1794           *outptr = (base64 << 4) & 255;
1795           pos ++;
1796           break;
1797       case 2 :
1798           *outptr++ |= (base64 >> 2) & 15;
1799           *outptr = (base64 << 6) & 255;
1800           pos ++;
1801           break;
1802       case 3 :
1803           *outptr++ |= base64;
1804           pos = 0;
1805           break;
1806     }
1807   }
1808
1809   *outptr = '\0';
1810
1811  /*
1812   * Return the decoded string...
1813   */
1814
1815   return (out);
1816 }
1817
1818
1819 /*
1820  * 'httpEncode64()' - Base64-encode a string.
1821  */
1822
1823 char *                          /* O - Encoded string */
1824 httpEncode64(char       *out,   /* I - String to write to */
1825              const char *in)    /* I - String to read from */
1826 {
1827   char          *outptr;        /* Output pointer */
1828   static const char base64[] =  /* Base64 characters... */
1829                 {
1830                   "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1831                   "abcdefghijklmnopqrstuvwxyz"
1832                   "0123456789"
1833                   "+/"
1834                 };
1835
1836
1837   for (outptr = out; *in != '\0'; in ++)
1838   {
1839    /*
1840     * Encode the up to 3 characters as 4 Base64 numbers...
1841     */
1842
1843     *outptr ++ = base64[in[0] >> 2];
1844     *outptr ++ = base64[((in[0] << 4) | (in[1] >> 4)) & 63];
1845
1846     in ++;
1847     if (*in == '\0')
1848     {
1849       *outptr ++ = '=';
1850       break;
1851     }
1852
1853     *outptr ++ = base64[((in[0] << 2) | (in[1] >> 6)) & 63];
1854
1855     in ++;
1856     if (*in == '\0')
1857       break;
1858
1859     *outptr ++ = base64[in[0] & 63];
1860   }
1861
1862   *outptr ++ = '=';
1863   *outptr = '\0';
1864
1865  /*
1866   * Return the encoded string...
1867   */
1868
1869   return (out);
1870 }
1871
1872
1873 /*
1874  * 'httpGetLength()' - Get the amount of data remaining from the
1875  *                     content-length or transfer-encoding fields.
1876  */
1877
1878 int                             /* O - Content length */
1879 httpGetLength(http_t *http)     /* I - HTTP data */
1880 {
1881   DEBUG_printf(("httpGetLength(%p), state = %d\n", http, http->state));
1882
1883   if (strcasecmp(http->fields[HTTP_FIELD_TRANSFER_ENCODING], "chunked") == 0)
1884   {
1885     DEBUG_puts("httpGetLength: chunked request!");
1886
1887     http->data_encoding  = HTTP_ENCODE_CHUNKED;
1888     http->data_remaining = 0;
1889   }
1890   else
1891   {
1892     http->data_encoding = HTTP_ENCODE_LENGTH;
1893
1894    /*
1895     * The following is a hack for HTTP servers that don't send a
1896     * content-length or transfer-encoding field...
1897     *
1898     * If there is no content-length then the connection must close
1899     * after the transfer is complete...
1900     */
1901
1902     if (http->fields[HTTP_FIELD_CONTENT_LENGTH][0] == '\0')
1903       http->data_remaining = 2147483647;
1904     else
1905       http->data_remaining = atoi(http->fields[HTTP_FIELD_CONTENT_LENGTH]);
1906
1907     DEBUG_printf(("httpGetLength: content_length = %d\n", http->data_remaining));
1908   }
1909
1910   return (http->data_remaining);
1911 }
1912
1913
1914 /*
1915  * 'http_field()' - Return the field index for a field name.
1916  */
1917
1918 static http_field_t             /* O - Field index */
1919 http_field(const char *name)    /* I - String name */
1920 {
1921   int   i;                      /* Looping var */
1922
1923
1924   for (i = 0; i < HTTP_FIELD_MAX; i ++)
1925     if (strcasecmp(name, http_fields[i]) == 0)
1926       return ((http_field_t)i);
1927
1928   return (HTTP_FIELD_UNKNOWN);
1929 }
1930
1931
1932 /*
1933  * 'http_send()' - Send a request with all fields and the trailing blank line.
1934  */
1935
1936 static int                      /* O - 0 on success, non-zero on error */
1937 http_send(http_t       *http,   /* I - HTTP data */
1938           http_state_t request, /* I - Request code */
1939           const char   *uri)    /* I - URI */
1940 {
1941   int           i;              /* Looping var */
1942   char          *ptr,           /* Pointer in buffer */
1943                 buf[1024];      /* Encoded URI buffer */
1944   static const char * const codes[] =
1945                 {               /* Request code strings */
1946                   NULL,
1947                   "OPTIONS",
1948                   "GET",
1949                   NULL,
1950                   "HEAD",
1951                   "POST",
1952                   NULL,
1953                   NULL,
1954                   "PUT",
1955                   NULL,
1956                   "DELETE",
1957                   "TRACE",
1958                   "CLOSE"
1959                 };
1960   static const char hex[] = "0123456789ABCDEF";
1961                                 /* Hex digits */
1962
1963
1964   if (http == NULL || uri == NULL)
1965     return (-1);
1966
1967  /*
1968   * Encode the URI as needed...
1969   */
1970
1971   for (ptr = buf; *uri != '\0' && ptr < (buf + sizeof(buf) - 1); uri ++)
1972     if (*uri <= ' ' || *uri >= 127)
1973     {
1974       if (ptr < (buf + sizeof(buf) - 1))
1975         *ptr ++ = '%';
1976       if (ptr < (buf + sizeof(buf) - 1))
1977         *ptr ++ = hex[(*uri >> 4) & 15];
1978       if (ptr < (buf + sizeof(buf) - 1))
1979         *ptr ++ = hex[*uri & 15];
1980     }
1981     else
1982       *ptr ++ = *uri;
1983
1984   *ptr = '\0';
1985
1986  /*
1987   * See if we had an error the last time around; if so, reconnect...
1988   */
1989
1990   if (http->status == HTTP_ERROR || http->status >= HTTP_BAD_REQUEST)
1991     httpReconnect(http);
1992
1993  /*
1994   * Send the request header...
1995   */
1996
1997   http->state = request;
1998   if (request == HTTP_POST || request == HTTP_PUT)
1999     http->state ++;
2000
2001   http->status = HTTP_CONTINUE;
2002
2003 #ifdef HAVE_SSL
2004   if (http->encryption == HTTP_ENCRYPT_REQUIRED && !http->tls)
2005   {
2006     httpSetField(http, HTTP_FIELD_CONNECTION, "Upgrade");
2007     httpSetField(http, HTTP_FIELD_UPGRADE, "TLS/1.0,SSL/2.0,SSL/3.0");
2008   }
2009 #endif /* HAVE_SSL */
2010
2011   if (httpPrintf(http, "%s %s HTTP/1.1\r\n", codes[request], buf) < 1)
2012   {
2013     http->status = HTTP_ERROR;
2014     return (-1);
2015   }
2016
2017   for (i = 0; i < HTTP_FIELD_MAX; i ++)
2018     if (http->fields[i][0] != '\0')
2019     {
2020       DEBUG_printf(("%s: %s\n", http_fields[i], http->fields[i]));
2021
2022       if (httpPrintf(http, "%s: %s\r\n", http_fields[i], http->fields[i]) < 1)
2023       {
2024         http->status = HTTP_ERROR;
2025         return (-1);
2026       }
2027     }
2028
2029   if (httpPrintf(http, "\r\n") < 1)
2030   {
2031     http->status = HTTP_ERROR;
2032     return (-1);
2033   }
2034
2035   httpClearFields(http);
2036
2037   return (0);
2038 }
2039
2040
2041 #ifdef HAVE_SSL
2042 /*
2043  * 'http_upgrade()' - Force upgrade to TLS encryption.
2044  */
2045
2046 static int                      /* O - Status of connection */
2047 http_upgrade(http_t *http)      /* I - HTTP data */
2048 {
2049   int           ret;            /* Return value */
2050   http_t        myhttp;         /* Local copy of HTTP data */
2051
2052
2053   DEBUG_printf(("http_upgrade(%p)\n", http));
2054
2055  /*
2056   * Copy the HTTP data to a local variable so we can do the OPTIONS
2057   * request without interfering with the existing request data...
2058   */
2059
2060   memcpy(&myhttp, http, sizeof(myhttp));
2061
2062  /*
2063   * Send an OPTIONS request to the server, requiring SSL or TLS
2064   * encryption on the link...
2065   */
2066
2067   httpClearFields(&myhttp);
2068   httpSetField(&myhttp, HTTP_FIELD_CONNECTION, "upgrade");
2069   httpSetField(&myhttp, HTTP_FIELD_UPGRADE, "TLS/1.0, SSL/2.0, SSL/3.0");
2070
2071   if ((ret = httpOptions(&myhttp, "*")) == 0)
2072   {
2073    /*
2074     * Wait for the secure connection...
2075     */
2076
2077     while (httpUpdate(&myhttp) == HTTP_CONTINUE);
2078   }
2079
2080   httpFlush(&myhttp);
2081
2082  /*
2083   * Copy the HTTP data back over, if any...
2084   */
2085
2086   http->fd         = myhttp.fd;
2087   http->error      = myhttp.error;
2088   http->activity   = myhttp.activity;
2089   http->status     = myhttp.status;
2090   http->version    = myhttp.version;
2091   http->keep_alive = myhttp.keep_alive;
2092   http->used       = myhttp.used;
2093
2094   if (http->used)
2095     memcpy(http->buffer, myhttp.buffer, http->used);
2096
2097   http->auth_type   = myhttp.auth_type;
2098   http->nonce_count = myhttp.nonce_count;
2099
2100   memcpy(http->nonce, myhttp.nonce, sizeof(http->nonce));
2101
2102   http->tls        = myhttp.tls;
2103   http->encryption = myhttp.encryption;
2104
2105  /*
2106   * See if we actually went secure...
2107   */
2108
2109   if (!http->tls)
2110   {
2111    /*
2112     * Server does not support HTTP upgrade...
2113     */
2114
2115     DEBUG_puts("Server does not support HTTP upgrade!");
2116
2117 #  ifdef WIN32
2118     closesocket(http->fd);
2119 #  else
2120     close(http->fd);
2121 #  endif
2122
2123     http->fd = -1;
2124
2125     return (-1);
2126   }
2127   else
2128     return (ret);
2129 }
2130
2131
2132 /*
2133  * 'http_setup_ssl()' - Set up SSL/TLS support on a connection.
2134  */
2135
2136 static int                              /* O - Status of connection */
2137 http_setup_ssl(http_t *http)            /* I - HTTP data */
2138 {
2139 #  ifdef HAVE_LIBSSL
2140   SSL_CTX       *context;       /* Context for encryption */
2141   SSL           *conn;          /* Connection for encryption */
2142 #  elif defined(HAVE_GNUTLS)
2143   http_tls_t    *conn;          /* TLS session object */
2144   gnutls_certificate_client_credentials *credentials;
2145                                 /* TLS credentials */
2146 #  elif defined(HAVE_CDSASSL)
2147   SSLContextRef conn;           /* Context for encryption */
2148   OSStatus      error;          /* Error info */
2149 #  endif /* HAVE_LIBSSL */
2150
2151
2152 #  ifdef HAVE_LIBSSL
2153   context = SSL_CTX_new(SSLv23_client_method());
2154   conn    = SSL_new(context);
2155
2156   SSL_set_fd(conn, http->fd);
2157   if (SSL_connect(conn) != 1)
2158   {
2159     SSL_CTX_free(context);
2160     SSL_free(conn);
2161
2162 #    ifdef WIN32
2163     http->error  = WSAGetLastError();
2164 #    else
2165     http->error  = errno;
2166 #    endif /* WIN32 */
2167     http->status = HTTP_ERROR;
2168
2169     return (HTTP_ERROR);
2170   }
2171
2172 #  elif defined(HAVE_GNUTLS)
2173   conn = (http_tls_t *)malloc(sizeof(http_tls_t));
2174
2175   if (conn == NULL)
2176   {
2177     http->error  = errno;
2178     http->status = HTTP_ERROR;
2179
2180     return (-1);
2181   }
2182
2183   credentials = (gnutls_certificate_client_credentials *)
2184                     malloc(sizeof(gnutls_certificate_client_credentials));
2185   if (credentials == NULL)
2186   {
2187     free(conn);
2188
2189     http->error = errno;
2190     http->status = HTTP_ERROR;
2191
2192     return (-1);
2193   }
2194
2195   gnutls_certificate_allocate_credentials(credentials);
2196
2197   gnutls_init(&(conn->session), GNUTLS_CLIENT);
2198   gnutls_set_default_priority(conn->session);
2199   gnutls_credentials_set(conn->session, GNUTLS_CRD_CERTIFICATE, *credentials);
2200   gnutls_transport_set_ptr(conn->session, http->fd);
2201
2202   if ((gnutls_handshake(conn->session)) != GNUTLS_E_SUCCESS)
2203   {
2204     http->error  = errno;
2205     http->status = HTTP_ERROR;
2206
2207     return (-1);
2208   }
2209
2210   conn->credentials = credentials;
2211
2212 #  elif defined(HAVE_CDSASSL)
2213   error = SSLNewContext(false, &conn);
2214
2215   if (!error)
2216     error = SSLSetIOFuncs(conn, CDSAReadFunc, CDSAWriteFunc);
2217
2218   if (!error)
2219     error = SSLSetConnection(conn, (SSLConnectionRef)http->fd);
2220
2221   if (!error)
2222     error = SSLSetAllowsExpiredCerts(conn, true);
2223
2224   if (!error)
2225     error = SSLSetAllowsAnyRoot(conn, true);
2226
2227   if (!error)
2228     error = SSLHandshake(conn);
2229
2230   if (error != 0)
2231   {
2232     http->error  = error;
2233     http->status = HTTP_ERROR;
2234
2235     SSLDisposeContext(conn);
2236
2237     close(http->fd);
2238
2239     return (-1);
2240   }
2241 #  endif /* HAVE_CDSASSL */
2242
2243   http->tls = conn;
2244   return (0);
2245 }
2246
2247
2248 /*
2249  * 'http_shutdown_ssl()' - Shut down SSL/TLS on a connection.
2250  */
2251
2252 static void
2253 http_shutdown_ssl(http_t *http) /* I - HTTP data */
2254 {
2255 #  ifdef HAVE_LIBSSL
2256   SSL_CTX       *context;       /* Context for encryption */
2257   SSL           *conn;          /* Connection for encryption */
2258
2259
2260   conn    = (SSL *)(http->tls);
2261   context = SSL_get_SSL_CTX(conn);
2262
2263   SSL_shutdown(conn);
2264   SSL_CTX_free(context);
2265   SSL_free(conn);
2266
2267 #  elif defined(HAVE_GNUTLS)
2268   http_tls_t      *conn;        /* Encryption session */
2269   gnutls_certificate_client_credentials *credentials;
2270                                 /* TLS credentials */
2271
2272
2273   conn = (http_tls_t *)(http->tls);
2274   credentials = (gnutls_certificate_client_credentials *)(conn->credentials);
2275
2276   gnutls_bye(conn->session, GNUTLS_SHUT_RDWR);
2277   gnutls_deinit(conn->session);
2278   gnutls_certificate_free_credentials(*credentials);
2279   free(credentials);
2280   free(conn);
2281
2282 #  elif defined(HAVE_CDSASSL)
2283   SSLClose((SSLContextRef)http->tls);
2284   SSLDisposeContext((SSLContextRef)http->tls);
2285 #  endif /* HAVE_LIBSSL */
2286
2287   http->tls = NULL;
2288 }
2289
2290
2291 /*
2292  * 'http_read_ssl()' - Read from a SSL/TLS connection.
2293  */
2294
2295 static int                              /* O - Bytes read */
2296 http_read_ssl(http_t *http,             /* I - HTTP data */
2297               char   *buf,              /* I - Buffer to store data */
2298               int    len)               /* I - Length of buffer */
2299 {
2300 #  if defined(HAVE_LIBSSL)
2301   return (SSL_read((SSL *)(http->tls), buf, len));
2302
2303 #  elif defined(HAVE_GNUTLS)
2304   return (gnutls_record_recv(((http_tls_t *)(http->tls))->session, buf, len));
2305
2306 #  elif defined(HAVE_CDSASSL)
2307   OSStatus      error;                  /* Error info */
2308   size_t        processed;              /* Number of bytes processed */
2309
2310
2311   error = SSLRead((SSLContextRef)http->tls, buf, len, &processed);
2312
2313   if (error == 0)
2314     return (processed);
2315   else
2316   {
2317     http->error = error;
2318
2319     return (-1);
2320   }
2321 #  endif /* HAVE_LIBSSL */
2322 }
2323
2324
2325 /*
2326  * 'http_write_ssl()' - Write to a SSL/TLS connection.
2327  */
2328
2329 static int                              /* O - Bytes written */
2330 http_write_ssl(http_t     *http,        /* I - HTTP data */
2331                const char *buf,         /* I - Buffer holding data */
2332                int        len)          /* I - Length of buffer */
2333 {
2334 #  if defined(HAVE_LIBSSL)
2335   return (SSL_write((SSL *)(http->tls), buf, len));
2336
2337 #  elif defined(HAVE_GNUTLS)
2338   return (gnutls_record_send(((http_tls_t *)(http->tls))->session, buf, len));
2339 #  elif defined(HAVE_CDSASSL)
2340   OSStatus      error;                  /* Error info */
2341   size_t        processed;              /* Number of bytes processed */
2342
2343
2344   error = SSLWrite((SSLContextRef)http->tls, buf, len, &processed);
2345
2346   if (error == 0)
2347     return (processed);
2348   else
2349   {
2350     http->error = error;
2351     return (-1);
2352   }
2353 #  endif /* HAVE_LIBSSL */
2354 }
2355
2356
2357 #  if defined(HAVE_CDSASSL)
2358 /*
2359  * 'CDSAReadFunc()' - Read function for CDSA decryption code.
2360  */
2361
2362 static OSStatus                                 /* O  - -1 on error, 0 on success */
2363 CDSAReadFunc(SSLConnectionRef connection,       /* I  - SSL/TLS connection */
2364              void             *data,            /* I  - Data buffer */
2365              size_t           *dataLength)      /* IO - Number of bytes */
2366 {
2367   ssize_t       bytes;                          /* Number of bytes read */
2368
2369
2370   bytes = recv((int)connection, data, *dataLength, 0);
2371   if (bytes >= 0)
2372   {
2373     *dataLength = bytes;
2374     return (0);
2375   }
2376   else
2377     return (-1);
2378 }
2379
2380
2381 /*
2382  * 'CDSAWriteFunc()' - Write function for CDSA encryption code.
2383  */
2384
2385 static OSStatus                                 /* O  - -1 on error, 0 on success */
2386 CDSAWriteFunc(SSLConnectionRef connection,      /* I  - SSL/TLS connection */
2387               const void       *data,           /* I  - Data buffer */
2388               size_t           *dataLength)     /* IO - Number of bytes */
2389 {
2390   ssize_t bytes;
2391
2392
2393   bytes = write((int)connection, data, *dataLength);
2394   if (bytes >= 0)
2395   {
2396     *dataLength = bytes;
2397     return (0);
2398   }
2399   else
2400     return (-1);
2401 }
2402 #  endif /* HAVE_CDSASSL */
2403 #endif /* HAVE_SSL */
2404
2405
2406 /*
2407  * End of "$Id: http.c,v 1.82.2.33 2003/05/09 18:35:37 mike Exp $".
2408  */