cups/http.c

   1 /*
   2  * "$Id: http.c,v 1.105 2002/10/30 20:04:56 mike Exp $"
   3  *
   4  *   HTTP routines for the Common UNIX Printing System (CUPS).
   5  *
   6  *   Copyright 1997-2002 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  *   httpClose()          - Close an HTTP connection...
  33  *   httpConnect()        - Connect to a HTTP server.
  34  *   httpConnectEncrypt() - Connect to a HTTP server using encryption.
  35  *   httpEncryption()     - Set the required encryption on the link.
  36  *   httpReconnect()      - Reconnect to a HTTP server...
  37  *   httpGetSubField()    - Get a sub-field value.
  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  *   httpWrite()          - Write data to a HTTP connection.
  49  *   httpGets()           - Get a line of text from a HTTP connection.
  50  *   httpPrintf()         - Print a formatted string to a HTTP connection.
  51  *   httpGetDateString()  - Get a formatted date/time string from a time value.
  52  *   httpGetDateTime()    - Get a time value from a formatted date/time string.
  53  *   httpUpdate()         - Update the current HTTP state for incoming data.
  54  *   httpDecode64()       - Base64-decode a string.
  55  *   httpEncode64()       - Base64-encode a string.
  56  *   httpGetLength()      - Get the amount of data remaining from the
  57  *                          content-length or transfer-encoding fields.
  58  *   http_field()         - Return the field index for a field name.
  59  *   http_send()          - Send a request with all fields and the trailing
  60  *                          blank line.
  61  *   http_upgrade()       - Force upgrade to TLS encryption.
  62  */
  63
  64 /*
  65  * Include necessary headers...
  66  */
  67
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <stdarg.h>
  71 #include <ctype.h>
  72 #include "string.h"
  73 #include <fcntl.h>
  74 #include <errno.h>
  75
  76 #include "http.h"
  77 #include "debug.h"
  78
  79 #ifndef WIN32
  80 #  include <signal.h>
  81 #endif /* !WIN32 */
  82
  83 #ifdef HAVE_LIBSSL
  84 #  include <openssl/err.h>
  85 #  include <openssl/rand.h>
  86 #  include <openssl/ssl.h>
  87 #endif /* HAVE_LIBSSL */
  88
  89
  90 /*
  91  * Some operating systems have done away with the Fxxxx constants for
  92  * the fcntl() call; this works around that "feature"...
  93  */
  94
  95 #ifndef FNONBLK
  96 #  define FNONBLK O_NONBLOCK
  97 #endif /* !FNONBLK */
  98
  99
 100 /*
 101  * Local functions...
 102  */
 103
 104 static http_field_t     http_field(const char *name);
 105 static int              http_send(http_t *http, http_state_t request,
 106                                   const char *uri);
 107 #ifdef HAVE_LIBSSL
 108 static int              http_upgrade(http_t *http);
 109 #endif /* HAVE_LIBSSL */
 110
 111
 112 /*
 113  * Local globals...
 114  */
 115
 116 static const char       *http_fields[] =
 117                         {
 118                           "Accept-Language",
 119                           "Accept-Ranges",
 120                           "Authorization",
 121                           "Connection",
 122                           "Content-Encoding",
 123                           "Content-Language",
 124                           "Content-Length",
 125                           "Content-Location",
 126                           "Content-MD5",
 127                           "Content-Range",
 128                           "Content-Type",
 129                           "Content-Version",
 130                           "Date",
 131                           "Host",
 132                           "If-Modified-Since",
 133                           "If-Unmodified-since",
 134                           "Keep-Alive",
 135                           "Last-Modified",
 136                           "Link",
 137                           "Location",
 138                           "Range",
 139                           "Referer",
 140                           "Retry-After",
 141                           "Transfer-Encoding",
 142                           "Upgrade",
 143                           "User-Agent",
 144                           "WWW-Authenticate"
 145                         };
 146 static const char       *days[7] =
 147                         {
 148                           "Sun",
 149                           "Mon",
 150                           "Tue",
 151                           "Wed",
 152                           "Thu",
 153                           "Fri",
 154                           "Sat"
 155                         };
 156 static const char       *months[12] =
 157                         {
 158                           "Jan",
 159                           "Feb",
 160                           "Mar",
 161                           "Apr",
 162                           "May",
 163                           "Jun",
 164                           "Jul",
 165                           "Aug",
 166                           "Sep",
 167                           "Oct",
 168                           "Nov",
 169                           "Dec"
 170                         };
 171
 172
 173 /*
 174  * 'httpInitialize()' - Initialize the HTTP interface library and set the
 175  *                      default HTTP proxy (if any).
 176  */
 177
 178 void
 179 httpInitialize(void)
 180 {
 181 #ifdef HAVE_LIBSSL
 182 #  ifndef WIN32
 183   struct timeval        curtime;        /* Current time in microseconds */
 184 #  endif // !WIN32
 185   int                   i;              /* Looping var */
 186   unsigned char         data[1024];     /* Seed data */
 187 #endif /* HAVE_LIBSSL */
 188
 189 #ifdef WIN32
 190   WSADATA       winsockdata;    /* WinSock data */
 191   static int    initialized = 0;/* Has WinSock been initialized? */
 192
 193
 194   if (!initialized)
 195     WSAStartup(MAKEWORD(1,1), &winsockdata);
 196 #elif defined(HAVE_SIGSET)
 197   sigset(SIGPIPE, SIG_IGN);
 198 #elif defined(HAVE_SIGACTION)
 199   struct sigaction      action; /* POSIX sigaction data */
 200
 201
 202  /*
 203   * Ignore SIGPIPE signals...
 204   */
 205
 206   memset(&action, 0, sizeof(action));
 207   action.sa_handler = SIG_IGN;
 208   sigaction(SIGPIPE, &action, NULL);
 209 #else
 210   signal(SIGPIPE, SIG_IGN);
 211 #endif /* WIN32 */
 212
 213 #ifdef HAVE_LIBSSL
 214   SSL_load_error_strings();
 215   SSL_library_init();
 216
 217  /*
 218   * Using the current time is a dubious random seed, but on some systems
 219   * it is the best we can do (on others, this seed isn't even used...)
 220   */
 221
 222 #ifdef WIN32
 223 #else
 224   gettimeofday(&curtime, NULL);
 225   srand(curtime.tv_sec + curtime.tv_usec);
 226 #endif // WIN32
 227
 228   for (i = 0; i < sizeof(data); i ++)
 229     data[i] = rand(); /* Yes, this is a poor source of random data... */
 230
 231   RAND_seed(&data, sizeof(data));
 232 #endif /* HAVE_LIBSSL */
 233 }
 234
 235
 236 /*
 237  * 'httpCheck()' - Check to see if there is a pending response from the server.
 238  */
 239
 240 int                             /* O - 0 = no data, 1 = data available */
 241 httpCheck(http_t *http)         /* I - HTTP connection */
 242 {
 243   fd_set        input;          /* Input set for select() */
 244   struct timeval timeout;       /* Timeout */
 245
 246
 247  /*
 248   * First see if there is data in the buffer...
 249   */
 250
 251   if (http == NULL)
 252     return (0);
 253
 254   if (http->used)
 255     return (1);
 256
 257  /*
 258   * Then try doing a select() to poll the socket...
 259   */
 260
 261   FD_ZERO(&input);
 262   FD_SET(http->fd, &input);
 263
 264   timeout.tv_sec  = 0;
 265   timeout.tv_usec = 0;
 266
 267   return (select(http->fd + 1, &input, NULL, NULL, &timeout) > 0);
 268 }
 269
 270
 271 /*
 272  * 'httpClose()' - Close an HTTP connection...
 273  */
 274
 275 void
 276 httpClose(http_t *http)         /* I - Connection to close */
 277 {
 278 #ifdef HAVE_LIBSSL
 279   SSL_CTX       *context;       /* Context for encryption */
 280   SSL           *conn;          /* Connection for encryption */
 281 #endif /* HAVE_LIBSSL */
 282
 283
 284   if (!http)
 285     return;
 286
 287 #ifdef HAVE_LIBSSL
 288   if (http->tls)
 289   {
 290     conn    = (SSL *)(http->tls);
 291     context = SSL_get_SSL_CTX(conn);
 292
 293     SSL_shutdown(conn);
 294     SSL_CTX_free(context);
 295     SSL_free(conn);
 296
 297     http->tls = NULL;
 298   }
 299 #endif /* HAVE_LIBSSL */
 300
 301 #ifdef WIN32
 302   closesocket(http->fd);
 303 #else
 304   close(http->fd);
 305 #endif /* WIN32 */
 306
 307   free(http);
 308 }
 309
 310
 311 /*
 312  * 'httpConnect()' - Connect to a HTTP server.
 313  */
 314
 315 http_t *                        /* O - New HTTP connection */
 316 httpConnect(const char *host,   /* I - Host to connect to */
 317             int        port)    /* I - Port number */
 318 {
 319   http_encryption_t     encrypt;/* Type of encryption to use */
 320
 321
 322  /*
 323   * Set the default encryption status...
 324   */
 325
 326   if (port == 443)
 327     encrypt = HTTP_ENCRYPT_ALWAYS;
 328   else
 329     encrypt = HTTP_ENCRYPT_IF_REQUESTED;
 330
 331   return (httpConnectEncrypt(host, port, encrypt));
 332 }
 333
 334
 335 /*
 336  * 'httpConnectEncrypt()' - Connect to a HTTP server using encryption.
 337  */
 338
 339 http_t *                                /* O - New HTTP connection */
 340 httpConnectEncrypt(const char *host,    /* I - Host to connect to */
 341                    int        port,     /* I - Port number */
 342                    http_encryption_t encrypt)
 343                                         /* I - Type of encryption to use */
 344 {
 345   int                   i;              /* Looping var */
 346   http_t                *http;          /* New HTTP connection */
 347   struct hostent        *hostaddr;      /* Host address data */
 348
 349
 350   if (host == NULL)
 351     return (NULL);
 352
 353   httpInitialize();
 354
 355  /*
 356   * Lookup the host...
 357   */
 358
 359   if ((hostaddr = httpGetHostByName(host)) == NULL)
 360   {
 361    /*
 362     * This hack to make users that don't have a localhost entry in
 363     * their hosts file or DNS happy...
 364     */
 365
 366     if (strcasecmp(host, "localhost") != 0)
 367       return (NULL);
 368     else if ((hostaddr = httpGetHostByName("127.0.0.1")) == NULL)
 369       return (NULL);
 370   }
 371
 372  /*
 373   * Verify that it is an IPv4 address (IPv6 support will come in CUPS 1.2...)
 374   */
 375
 376   if (hostaddr->h_addrtype != AF_INET || hostaddr->h_length != 4)
 377     return (NULL);
 378
 379  /*
 380   * Allocate memory for the structure...
 381   */
 382
 383   http = calloc(sizeof(http_t), 1);
 384   if (http == NULL)
 385     return (NULL);
 386
 387   http->version  = HTTP_1_1;
 388   http->blocking = 1;
 389   http->activity = time(NULL);
 390   http->fd       = -1;
 391
 392  /*
 393   * Copy the hostname and port and then "reconnect"...
 394   */
 395
 396   strlcpy(http->hostname, host, sizeof(http->hostname));
 397   http->hostaddr.sin_family = hostaddr->h_addrtype;
 398 #ifdef WIN32
 399   http->hostaddr.sin_port   = htons((u_short)port);
 400 #else
 401   http->hostaddr.sin_port   = htons(port);
 402 #endif /* WIN32 */
 403
 404  /*
 405   * Set the encryption status...
 406   */
 407
 408   if (port == 443)      /* Always use encryption for https */
 409     http->encryption = HTTP_ENCRYPT_ALWAYS;
 410   else
 411     http->encryption = encrypt;
 412
 413  /*
 414   * Loop through the addresses we have until one of them connects...
 415   */
 416
 417   strlcpy(http->hostname, host, sizeof(http->hostname));
 418
 419   for (i = 0; hostaddr->h_addr_list[i]; i ++)
 420   {
 421    /*
 422     * Load the address...
 423     */
 424
 425     memcpy((char *)&(http->hostaddr.sin_addr), hostaddr->h_addr_list[i],
 426            hostaddr->h_length);
 427
 428    /*
 429     * Connect to the remote system...
 430     */
 431
 432     if (!httpReconnect(http))
 433       return (http);
 434   }
 435
 436  /*
 437   * Could not connect to any known address - bail out!
 438   */
 439
 440   free(http);
 441   return (NULL);
 442 }
 443
 444
 445 /*
 446  * 'httpEncryption()' - Set the required encryption on the link.
 447  */
 448
 449 int                                     /* O - -1 on error, 0 on success */
 450 httpEncryption(http_t            *http, /* I - HTTP data */
 451                http_encryption_t e)     /* I - New encryption preference */
 452 {
 453 #ifdef HAVE_LIBSSL
 454   if (!http)
 455     return (0);
 456
 457   http->encryption = e;
 458
 459   if ((http->encryption == HTTP_ENCRYPT_ALWAYS && !http->tls) ||
 460       (http->encryption == HTTP_ENCRYPT_NEVER && http->tls))
 461     return (httpReconnect(http));
 462   else if (http->encryption == HTTP_ENCRYPT_REQUIRED && !http->tls)
 463     return (http_upgrade(http));
 464   else
 465     return (0);
 466 #else
 467   if (e == HTTP_ENCRYPT_ALWAYS || e == HTTP_ENCRYPT_REQUIRED)
 468     return (-1);
 469   else
 470     return (0);
 471 #endif /* HAVE_LIBSSL */
 472 }
 473
 474
 475 /*
 476  * 'httpReconnect()' - Reconnect to a HTTP server...
 477  */
 478
 479 int                             /* O - 0 on success, non-zero on failure */
 480 httpReconnect(http_t *http)     /* I - HTTP data */
 481 {
 482   int           val;            /* Socket option value */
 483 #ifdef HAVE_LIBSSL
 484   SSL_CTX       *context;       /* Context for encryption */
 485   SSL           *conn;          /* Connection for encryption */
 486
 487
 488   if (http->tls)
 489   {
 490     conn    = (SSL *)(http->tls);
 491     context = SSL_get_SSL_CTX(conn);
 492
 493     SSL_shutdown(conn);
 494     SSL_CTX_free(context);
 495     SSL_free(conn);
 496
 497     http->tls = NULL;
 498   }
 499 #endif /* HAVE_LIBSSL */
 500
 501  /*
 502   * Close any previously open socket...
 503   */
 504
 505   if (http->fd >= 0)
 506 #ifdef WIN32
 507     closesocket(http->fd);
 508 #else
 509     close(http->fd);
 510 #endif /* WIN32 */
 511
 512  /*
 513   * Create the socket and set options to allow reuse.
 514   */
 515
 516   if ((http->fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
 517   {
 518 #ifdef WIN32
 519     http->error  = WSAGetLastError();
 520 #else
 521     http->error  = errno;
 522 #endif /* WIN32 */
 523     http->status = HTTP_ERROR;
 524     return (-1);
 525   }
 526
 527 #ifdef FD_CLOEXEC
 528   fcntl(http->fd, F_SETFD, FD_CLOEXEC); /* Close this socket when starting *
 529                                          * other processes...              */
 530 #endif /* FD_CLOEXEC */
 531
 532   val = 1;
 533   setsockopt(http->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 534
 535 #ifdef SO_REUSEPORT
 536   val = 1;
 537   setsockopt(http->fd, SOL_SOCKET, SO_REUSEPORT, &val, sizeof(val));
 538 #endif /* SO_REUSEPORT */
 539
 540  /*
 541   * Using TCP_NODELAY improves responsiveness, especially on systems
 542   * with a slow loopback interface...  Since we write large buffers
 543   * when sending print files and requests, there shouldn't be any
 544   * performance penalty for this...
 545   */
 546
 547   val = 1;
 548   setsockopt(http->fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
 549
 550  /*
 551   * Connect to the server...
 552   */
 553
 554   if (connect(http->fd, (struct sockaddr *)&(http->hostaddr),
 555               sizeof(http->hostaddr)) < 0)
 556   {
 557 #ifdef WIN32
 558     http->error  = WSAGetLastError();
 559 #else
 560     http->error  = errno;
 561 #endif /* WIN32 */
 562     http->status = HTTP_ERROR;
 563
 564 #ifdef WIN32
 565     closesocket(http->fd);
 566 #else
 567     close(http->fd);
 568 #endif
 569
 570     http->fd = -1;
 571
 572     return (-1);
 573   }
 574
 575   http->error  = 0;
 576   http->status = HTTP_CONTINUE;
 577
 578 #ifdef HAVE_LIBSSL
 579   if (http->encryption == HTTP_ENCRYPT_ALWAYS)
 580   {
 581    /*
 582     * Always do encryption via SSL.
 583     */
 584
 585     context = SSL_CTX_new(SSLv23_method());
 586     conn    = SSL_new(context);
 587
 588     SSL_set_fd(conn, http->fd);
 589     if (SSL_connect(conn) != 1)
 590     {
 591       SSL_CTX_free(context);
 592       SSL_free(conn);
 593
 594 #ifdef WIN32
 595       http->error  = WSAGetLastError();
 596 #else
 597       http->error  = errno;
 598 #endif /* WIN32 */
 599       http->status = HTTP_ERROR;
 600
 601 #ifdef WIN32
 602       closesocket(http->fd);
 603 #else
 604       close(http->fd);
 605 #endif
 606
 607       return (-1);
 608     }
 609
 610     http->tls = conn;
 611   }
 612   else if (http->encryption == HTTP_ENCRYPT_REQUIRED)
 613     return (http_upgrade(http));
 614 #endif /* HAVE_LIBSSL */
 615
 616   return (0);
 617 }
 618
 619
 620 /*
 621  * 'httpGetSubField()' - Get a sub-field value.
 622  */
 623
 624 char *                                  /* O - Value or NULL */
 625 httpGetSubField(http_t       *http,     /* I - HTTP data */
 626                 http_field_t field,     /* I - Field index */
 627                 const char   *name,     /* I - Name of sub-field */
 628                 char         *value)    /* O - Value string */
 629 {
 630   const char    *fptr;                  /* Pointer into field */
 631   char          temp[HTTP_MAX_VALUE],   /* Temporary buffer for name */
 632                 *ptr;                   /* Pointer into string buffer */
 633
 634
 635   if (http == NULL ||
 636       field < HTTP_FIELD_ACCEPT_LANGUAGE ||
 637       field > HTTP_FIELD_WWW_AUTHENTICATE ||
 638       name == NULL || value == NULL)
 639     return (NULL);
 640
 641   DEBUG_printf(("httpGetSubField(%p, %d, \"%s\", %p)\n",
 642                 http, field, name, value));
 643
 644   for (fptr = http->fields[field]; *fptr;)
 645   {
 646    /*
 647     * Skip leading whitespace...
 648     */
 649
 650     while (isspace(*fptr))
 651       fptr ++;
 652
 653     if (*fptr == ',')
 654     {
 655       fptr ++;
 656       continue;
 657     }
 658
 659    /*
 660     * Get the sub-field name...
 661     */
 662
 663     for (ptr = temp;
 664          *fptr && *fptr != '=' && !isspace(*fptr) && ptr < (temp + sizeof(temp) - 1);
 665          *ptr++ = *fptr++);
 666
 667     *ptr = '\0';
 668
 669     DEBUG_printf(("name = \"%s\"\n", temp));
 670
 671    /*
 672     * Skip trailing chars up to the '='...
 673     */
 674
 675     while (isspace(*fptr))
 676       fptr ++;
 677
 678     if (!*fptr)
 679       break;
 680
 681     if (*fptr != '=')
 682       continue;
 683
 684    /*
 685     * Skip = and leading whitespace...
 686     */
 687
 688     fptr ++;
 689
 690     while (isspace(*fptr))
 691       fptr ++;
 692
 693     if (*fptr == '\"')
 694     {
 695      /*
 696       * Read quoted string...
 697       */
 698
 699       for (ptr = value, fptr ++;
 700            *fptr && *fptr != '\"' && ptr < (value + HTTP_MAX_VALUE - 1);
 701            *ptr++ = *fptr++);
 702
 703       *ptr = '\0';
 704
 705       while (*fptr && *fptr != '\"')
 706         fptr ++;
 707
 708       if (*fptr)
 709         fptr ++;
 710     }
 711     else
 712     {
 713      /*
 714       * Read unquoted string...
 715       */
 716
 717       for (ptr = value;
 718            *fptr && !isspace(*fptr) && *fptr != ',' && ptr < (value + HTTP_MAX_VALUE - 1);
 719            *ptr++ = *fptr++);
 720
 721       *ptr = '\0';
 722
 723       while (*fptr && !isspace(*fptr) && *fptr != ',')
 724         fptr ++;
 725     }
 726
 727     DEBUG_printf(("value = \"%s\"\n", value));
 728
 729    /*
 730     * See if this is the one...
 731     */
 732
 733     if (strcmp(name, temp) == 0)
 734       return (value);
 735   }
 736
 737   value[0] = '\0';
 738
 739   return (NULL);
 740 }
 741
 742
 743 /*
 744  * 'httpSetField()' - Set the value of an HTTP header.
 745  */
 746
 747 void
 748 httpSetField(http_t       *http,        /* I - HTTP data */
 749              http_field_t field,        /* I - Field index */
 750              const char   *value)       /* I - Value */
 751 {
 752   if (http == NULL ||
 753       field < HTTP_FIELD_ACCEPT_LANGUAGE ||
 754       field > HTTP_FIELD_WWW_AUTHENTICATE ||
 755       value == NULL)
 756     return;
 757
 758   strlcpy(http->fields[field], value, HTTP_MAX_VALUE);
 759 }
 760
 761
 762 /*
 763  * 'httpDelete()' - Send a DELETE request to the server.
 764  */
 765
 766 int                                     /* O - Status of call (0 = success) */
 767 httpDelete(http_t     *http,            /* I - HTTP data */
 768            const char *uri)             /* I - URI to delete */
 769 {
 770   return (http_send(http, HTTP_DELETE, uri));
 771 }
 772
 773
 774 /*
 775  * 'httpGet()' - Send a GET request to the server.
 776  */
 777
 778 int                                     /* O - Status of call (0 = success) */
 779 httpGet(http_t     *http,               /* I - HTTP data */
 780         const char *uri)                /* I - URI to get */
 781 {
 782   return (http_send(http, HTTP_GET, uri));
 783 }
 784
 785
 786 /*
 787  * 'httpHead()' - Send a HEAD request to the server.
 788  */
 789
 790 int                                     /* O - Status of call (0 = success) */
 791 httpHead(http_t     *http,              /* I - HTTP data */
 792          const char *uri)               /* I - URI for head */
 793 {
 794   return (http_send(http, HTTP_HEAD, uri));
 795 }
 796
 797
 798 /*
 799  * 'httpOptions()' - Send an OPTIONS request to the server.
 800  */
 801
 802 int                                     /* O - Status of call (0 = success) */
 803 httpOptions(http_t     *http,           /* I - HTTP data */
 804             const char *uri)            /* I - URI for options */
 805 {
 806   return (http_send(http, HTTP_OPTIONS, uri));
 807 }
 808
 809
 810 /*
 811  * 'httpPost()' - Send a POST request to the server.
 812  */
 813
 814 int                                     /* O - Status of call (0 = success) */
 815 httpPost(http_t     *http,              /* I - HTTP data */
 816          const char *uri)               /* I - URI for post */
 817 {
 818   httpGetLength(http);
 819
 820   return (http_send(http, HTTP_POST, uri));
 821 }
 822
 823
 824 /*
 825  * 'httpPut()' - Send a PUT request to the server.
 826  */
 827
 828 int                                     /* O - Status of call (0 = success) */
 829 httpPut(http_t     *http,               /* I - HTTP data */
 830         const char *uri)                /* I - URI to put */
 831 {
 832   httpGetLength(http);
 833
 834   return (http_send(http, HTTP_PUT, uri));
 835 }
 836
 837
 838 /*
 839  * 'httpTrace()' - Send an TRACE request to the server.
 840  */
 841
 842 int                                     /* O - Status of call (0 = success) */
 843 httpTrace(http_t     *http,             /* I - HTTP data */
 844           const char *uri)              /* I - URI for trace */
 845 {
 846   return (http_send(http, HTTP_TRACE, uri));
 847 }
 848
 849
 850 /*
 851  * 'httpFlush()' - Flush data from a HTTP connection.
 852  */
 853
 854 void
 855 httpFlush(http_t *http) /* I - HTTP data */
 856 {
 857   char  buffer[8192];   /* Junk buffer */
 858
 859
 860   while (httpRead(http, buffer, sizeof(buffer)) > 0);
 861 }
 862
 863
 864 /*
 865  * 'httpRead()' - Read data from a HTTP connection.
 866  */
 867
 868 int                                     /* O - Number of bytes read */
 869 httpRead(http_t *http,                  /* I - HTTP data */
 870          char   *buffer,                /* I - Buffer for data */
 871          int    length)                 /* I - Maximum number of bytes */
 872 {
 873   int           bytes;                  /* Bytes read */
 874   char          len[32];                /* Length string */
 875
 876
 877   DEBUG_printf(("httpRead(%p, %p, %d)\n", http, buffer, length));
 878
 879   if (http == NULL || buffer == NULL)
 880     return (-1);
 881
 882   http->activity = time(NULL);
 883
 884   if (length <= 0)
 885     return (0);
 886
 887   if (http->data_encoding == HTTP_ENCODE_CHUNKED &&
 888       http->data_remaining <= 0)
 889   {
 890     DEBUG_puts("httpRead: Getting chunk length...");
 891
 892     if (httpGets(len, sizeof(len), http) == NULL)
 893     {
 894       DEBUG_puts("httpRead: Could not get length!");
 895       return (0);
 896     }
 897
 898     http->data_remaining = strtol(len, NULL, 16);
 899   }
 900
 901   DEBUG_printf(("httpRead: data_remaining = %d\n", http->data_remaining));
 902
 903   if (http->data_remaining == 0)
 904   {
 905    /*
 906     * A zero-length chunk ends a transfer; unless we are reading POST
 907     * data, go idle...
 908     */
 909
 910     if (http->data_encoding == HTTP_ENCODE_CHUNKED)
 911       httpGets(len, sizeof(len), http);
 912
 913     if (http->state == HTTP_POST_RECV)
 914       http->state ++;
 915     else
 916       http->state = HTTP_WAITING;
 917
 918     return (0);
 919   }
 920   else if (length > http->data_remaining)
 921     length = http->data_remaining;
 922
 923   if (http->used == 0 && length <= 256)
 924   {
 925    /*
 926     * Buffer small reads for better performance...
 927     */
 928
 929     if (http->data_remaining > sizeof(http->buffer))
 930       bytes = sizeof(http->buffer);
 931     else
 932       bytes = http->data_remaining;
 933
 934 #ifdef HAVE_LIBSSL
 935     if (http->tls)
 936       bytes = SSL_read((SSL *)(http->tls), http->buffer, bytes);
 937     else
 938 #endif /* HAVE_LIBSSL */
 939     {
 940       DEBUG_printf(("httpRead: reading %d bytes from socket into buffer...\n",
 941                     bytes));
 942
 943       bytes = recv(http->fd, http->buffer, bytes, 0);
 944
 945       DEBUG_printf(("httpRead: read %d bytes from socket into buffer...\n",
 946                     bytes));
 947     }
 948
 949     if (bytes > 0)
 950       http->used = bytes;
 951     else if (bytes < 0)
 952     {
 953 #ifdef WIN32
 954       http->error = WSAGetLastError();
 955       return (-1);
 956 #else
 957       if (errno != EINTR)
 958       {
 959         http->error = errno;
 960         return (-1);
 961       }
 962 #endif /* WIN32 */
 963     }
 964     else
 965       return (0);
 966   }
 967
 968   if (http->used > 0)
 969   {
 970     if (length > http->used)
 971       length = http->used;
 972
 973     bytes = length;
 974
 975     DEBUG_printf(("httpRead: grabbing %d bytes from input buffer...\n", bytes));
 976
 977     memcpy(buffer, http->buffer, length);
 978     http->used -= length;
 979
 980     if (http->used > 0)
 981       memmove(http->buffer, http->buffer + length, http->used);
 982   }
 983 #ifdef HAVE_LIBSSL
 984   else if (http->tls)
 985     bytes = SSL_read((SSL *)(http->tls), buffer, length);
 986 #endif /* HAVE_LIBSSL */
 987   else
 988   {
 989     DEBUG_printf(("httpRead: reading %d bytes from socket...\n", length));
 990     bytes = recv(http->fd, buffer, length, 0);
 991     DEBUG_printf(("httpRead: read %d bytes from socket...\n", bytes));
 992   }
 993
 994   if (bytes > 0)
 995     http->data_remaining -= bytes;
 996   else if (bytes < 0)
 997   {
 998 #ifdef WIN32
 999     http->error = WSAGetLastError();
1000 #else
1001     if (errno == EINTR)
1002       bytes = 0;
1003     else
1004       http->error = errno;
1005 #endif /* WIN32 */
1006   }
1007
1008   if (http->data_remaining == 0)
1009   {
1010     if (http->data_encoding == HTTP_ENCODE_CHUNKED)
1011       httpGets(len, sizeof(len), http);
1012
1013     if (http->data_encoding != HTTP_ENCODE_CHUNKED)
1014     {
1015       if (http->state == HTTP_POST_RECV)
1016         http->state ++;
1017       else
1018         http->state = HTTP_WAITING;
1019     }
1020   }
1021
1022 #ifdef DEBUG
1023   {
1024     int i, j, ch;
1025     printf("httpRead: Read %d bytes:\n", bytes);
1026     for (i = 0; i < bytes; i += 16)
1027     {
1028       printf("   ");
1029
1030       for (j = 0; j < 16 && (i + j) < bytes; j ++)
1031         printf(" %02X", buffer[i + j] & 255);
1032
1033       while (j < 16)
1034       {
1035         printf("   ");
1036         j ++;
1037       }
1038
1039       printf("    ");
1040       for (j = 0; j < 16 && (i + j) < bytes; j ++)
1041       {
1042         ch = buffer[i + j] & 255;
1043
1044         if (ch < ' ' || ch == 127)
1045           ch = '.';
1046
1047         putchar(ch);
1048       }
1049       putchar('\n');
1050     }
1051   }
1052 #endif /* DEBUG */
1053
1054   return (bytes);
1055 }
1056
1057
1058 /*
1059  * 'httpWrite()' - Write data to a HTTP connection.
1060  */
1061
1062 int                                     /* O - Number of bytes written */
1063 httpWrite(http_t     *http,             /* I - HTTP data */
1064           const char *buffer,           /* I - Buffer for data */
1065           int        length)            /* I - Number of bytes to write */
1066 {
1067   int   tbytes,                         /* Total bytes sent */
1068         bytes;                          /* Bytes sent */
1069
1070
1071   if (http == NULL || buffer == NULL)
1072     return (-1);
1073
1074   http->activity = time(NULL);
1075
1076   if (http->data_encoding == HTTP_ENCODE_CHUNKED)
1077   {
1078     if (httpPrintf(http, "%x\r\n", length) < 0)
1079       return (-1);
1080
1081     if (length == 0)
1082     {
1083      /*
1084       * A zero-length chunk ends a transfer; unless we are sending POST
1085       * data, go idle...
1086       */
1087
1088       DEBUG_puts("httpWrite: changing states...");
1089
1090       if (http->state == HTTP_POST_RECV)
1091         http->state ++;
1092       else if (http->state == HTTP_PUT_RECV)
1093         http->state = HTTP_STATUS;
1094       else
1095         http->state = HTTP_WAITING;
1096
1097       if (httpPrintf(http, "\r\n") < 0)
1098         return (-1);
1099
1100       return (0);
1101     }
1102   }
1103
1104   tbytes = 0;
1105
1106   while (length > 0)
1107   {
1108 #ifdef HAVE_LIBSSL
1109     if (http->tls)
1110       bytes = SSL_write((SSL *)(http->tls), buffer, length);
1111     else
1112 #endif /* HAVE_LIBSSL */
1113     bytes = send(http->fd, buffer, length, 0);
1114
1115     if (bytes < 0)
1116     {
1117 #ifdef WIN32
1118       if (WSAGetLastError() != http->error)
1119       {
1120         http->error = WSAGetLastError();
1121         continue;
1122       }
1123 #else
1124       if (errno == EINTR)
1125         continue;
1126       else if (errno != http->error)
1127       {
1128         http->error = errno;
1129         continue;
1130       }
1131 #endif /* WIN32 */
1132
1133       DEBUG_puts("httpWrite: error writing data...\n");
1134
1135       return (-1);
1136     }
1137
1138     buffer += bytes;
1139     tbytes += bytes;
1140     length -= bytes;
1141     if (http->data_encoding == HTTP_ENCODE_LENGTH)
1142       http->data_remaining -= bytes;
1143   }
1144
1145   if (http->data_encoding == HTTP_ENCODE_CHUNKED)
1146     if (httpPrintf(http, "\r\n") < 0)
1147       return (-1);
1148
1149   if (http->data_remaining == 0 && http->data_encoding == HTTP_ENCODE_LENGTH)
1150   {
1151    /*
1152     * Finished with the transfer; unless we are sending POST data, go idle...
1153     */
1154
1155     DEBUG_puts("httpWrite: changing states...");
1156
1157     if (http->state == HTTP_POST_RECV)
1158       http->state ++;
1159     else
1160       http->state = HTTP_WAITING;
1161   }
1162
1163 #ifdef DEBUG
1164   {
1165     int i, j, ch;
1166     printf("httpWrite: wrote %d bytes: \n", tbytes);
1167     for (i = 0, buffer -= tbytes; i < tbytes; i += 16)
1168     {
1169       printf("   ");
1170
1171       for (j = 0; j < 16 && (i + j) < tbytes; j ++)
1172         printf(" %02X", buffer[i + j] & 255);
1173
1174       while (j < 16)
1175       {
1176         printf("   ");
1177         j ++;
1178       }
1179
1180       printf("    ");
1181       for (j = 0; j < 16 && (i + j) < tbytes; j ++)
1182       {
1183         ch = buffer[i + j] & 255;
1184
1185         if (ch < ' ' || ch == 127)
1186           ch = '.';
1187
1188         putchar(ch);
1189       }
1190       putchar('\n');
1191     }
1192   }
1193 #endif /* DEBUG */
1194   return (tbytes);
1195 }
1196
1197
1198 /*
1199  * 'httpGets()' - Get a line of text from a HTTP connection.
1200  */
1201
1202 char *                                  /* O - Line or NULL */
1203 httpGets(char   *line,                  /* I - Line to read into */
1204          int    length,                 /* I - Max length of buffer */
1205          http_t *http)                  /* I - HTTP data */
1206 {
1207   char  *lineptr,                       /* Pointer into line */
1208         *bufptr,                        /* Pointer into input buffer */
1209         *bufend;                        /* Pointer to end of buffer */
1210   int   bytes;                          /* Number of bytes read */
1211
1212
1213   DEBUG_printf(("httpGets(%p, %d, %p)\n", line, length, http));
1214
1215   if (http == NULL || line == NULL)
1216     return (NULL);
1217
1218  /*
1219   * Pre-scan the buffer and see if there is a newline in there...
1220   */
1221
1222 #ifdef WIN32
1223   WSASetLastError(0);
1224 #else
1225   errno = 0;
1226 #endif /* WIN32 */
1227
1228   do
1229   {
1230     bufptr  = http->buffer;
1231     bufend  = http->buffer + http->used;
1232
1233     while (bufptr < bufend)
1234       if (*bufptr == 0x0a)
1235         break;
1236       else
1237         bufptr ++;
1238
1239     if (bufptr >= bufend && http->used < HTTP_MAX_BUFFER)
1240     {
1241      /*
1242       * No newline; see if there is more data to be read...
1243       */
1244
1245 #ifdef HAVE_LIBSSL
1246       if (http->tls)
1247         bytes = SSL_read((SSL *)(http->tls), bufend,
1248                          HTTP_MAX_BUFFER - http->used);
1249       else
1250 #endif /* HAVE_LIBSSL */
1251       bytes = recv(http->fd, bufend, HTTP_MAX_BUFFER - http->used, 0);
1252
1253       if (bytes < 0)
1254       {
1255        /*
1256         * Nope, can't get a line this time...
1257         */
1258
1259 #ifdef WIN32
1260         if (WSAGetLastError() != http->error)
1261         {
1262           http->error = WSAGetLastError();
1263           continue;
1264         }
1265
1266         DEBUG_printf(("httpGets(): recv() error %d!\n", WSAGetLastError()));
1267 #else
1268         if (errno == EINTR)
1269           continue;
1270         else if (errno != http->error)
1271         {
1272           http->error = errno;
1273           continue;
1274         }
1275
1276         DEBUG_printf(("httpGets(): recv() error %d!\n", errno));
1277 #endif /* WIN32 */
1278
1279         return (NULL);
1280       }
1281       else if (bytes == 0)
1282       {
1283         if (http->blocking)
1284           http->error = EPIPE;
1285
1286         return (NULL);
1287       }
1288
1289      /*
1290       * Yup, update the amount used and the end pointer...
1291       */
1292
1293       http->used += bytes;
1294       bufend     += bytes;
1295       bufptr     = bufend;
1296     }
1297   }
1298   while (bufptr >= bufend && http->used < HTTP_MAX_BUFFER);
1299
1300   http->activity = time(NULL);
1301
1302  /*
1303   * Read a line from the buffer...
1304   */
1305
1306   lineptr = line;
1307   bufptr  = http->buffer;
1308   bytes   = 0;
1309   length --;
1310
1311   while (bufptr < bufend && bytes < length)
1312   {
1313     bytes ++;
1314
1315     if (*bufptr == 0x0a)
1316     {
1317       bufptr ++;
1318       break;
1319     }
1320     else if (*bufptr == 0x0d)
1321       bufptr ++;
1322     else
1323       *lineptr++ = *bufptr++;
1324   }
1325
1326   if (bytes > 0)
1327   {
1328     *lineptr = '\0';
1329
1330     http->used -= bytes;
1331     if (http->used > 0)
1332       memmove(http->buffer, bufptr, http->used);
1333
1334     DEBUG_printf(("httpGets(): Returning \"%s\"\n", line));
1335     return (line);
1336   }
1337
1338   DEBUG_puts("httpGets(): No new line available!");
1339
1340   return (NULL);
1341 }
1342
1343
1344 /*
1345  * 'httpPrintf()' - Print a formatted string to a HTTP connection.
1346  */
1347
1348 int                                     /* O - Number of bytes written */
1349 httpPrintf(http_t     *http,            /* I - HTTP data */
1350            const char *format,          /* I - printf-style format string */
1351            ...)                         /* I - Additional args as needed */
1352 {
1353   int           bytes,                  /* Number of bytes to write */
1354                 nbytes,                 /* Number of bytes written */
1355                 tbytes;                 /* Number of bytes all together */
1356   char          buf[HTTP_MAX_BUFFER],   /* Buffer for formatted string */
1357                 *bufptr;                /* Pointer into buffer */
1358   va_list       ap;                     /* Variable argument pointer */
1359
1360
1361   va_start(ap, format);
1362   bytes = vsnprintf(buf, sizeof(buf), format, ap);
1363   va_end(ap);
1364
1365   DEBUG_printf(("httpPrintf: %s", buf));
1366
1367   for (tbytes = 0, bufptr = buf; tbytes < bytes; tbytes += nbytes, bufptr += nbytes)
1368   {
1369 #ifdef HAVE_LIBSSL
1370     if (http->tls)
1371       nbytes = SSL_write((SSL *)(http->tls), bufptr, bytes - tbytes);
1372     else
1373 #endif /* HAVE_LIBSSL */
1374     nbytes = send(http->fd, bufptr, bytes - tbytes, 0);
1375
1376     if (nbytes < 0)
1377     {
1378       nbytes = 0;
1379
1380 #ifdef WIN32
1381       if (WSAGetLastError() != http->error)
1382       {
1383         http->error = WSAGetLastError();
1384         continue;
1385       }
1386 #else
1387       if (errno == EINTR)
1388         continue;
1389       else if (errno != http->error)
1390       {
1391         http->error = errno;
1392         continue;
1393       }
1394 #endif /* WIN32 */
1395
1396       return (-1);
1397     }
1398   }
1399
1400   return (bytes);
1401 }
1402
1403
1404 /*
1405  * 'httpGetDateString()' - Get a formatted date/time string from a time value.
1406  */
1407
1408 const char *                            /* O - Date/time string */
1409 httpGetDateString(time_t t)             /* I - UNIX time */
1410 {
1411   struct tm     *tdate;
1412   static char   datetime[256];
1413
1414
1415   tdate = gmtime(&t);
1416   snprintf(datetime, sizeof(datetime), "%s, %02d %s %d %02d:%02d:%02d GMT",
1417            days[tdate->tm_wday], tdate->tm_mday, months[tdate->tm_mon],
1418            tdate->tm_year + 1900, tdate->tm_hour, tdate->tm_min, tdate->tm_sec);
1419
1420   return (datetime);
1421 }
1422
1423
1424 /*
1425  * 'httpGetDateTime()' - Get a time value from a formatted date/time string.
1426  */
1427
1428 time_t                                  /* O - UNIX time */
1429 httpGetDateTime(const char *s)          /* I - Date/time string */
1430 {
1431   int           i;                      /* Looping var */
1432   struct tm     tdate;                  /* Time/date structure */
1433   char          mon[16];                /* Abbreviated month name */
1434   int           day, year;              /* Day of month and year */
1435   int           hour, min, sec;         /* Time */
1436
1437
1438   if (sscanf(s, "%*s%d%15s%d%d:%d:%d", &day, mon, &year, &hour, &min, &sec) < 6)
1439     return (0);
1440
1441   for (i = 0; i < 12; i ++)
1442     if (strcasecmp(mon, months[i]) == 0)
1443       break;
1444
1445   if (i >= 12)
1446     return (0);
1447
1448   tdate.tm_mon   = i;
1449   tdate.tm_mday  = day;
1450   tdate.tm_year  = year - 1900;
1451   tdate.tm_hour  = hour;
1452   tdate.tm_min   = min;
1453   tdate.tm_sec   = sec;
1454   tdate.tm_isdst = 0;
1455
1456   return (mktime(&tdate));
1457 }
1458
1459
1460 /*
1461  * 'httpUpdate()' - Update the current HTTP state for incoming data.
1462  */
1463
1464 http_status_t                           /* O - HTTP status */
1465 httpUpdate(http_t *http)                /* I - HTTP data */
1466 {
1467   char          line[1024],             /* Line from connection... */
1468                 *value;                 /* Pointer to value on line */
1469   http_field_t  field;                  /* Field index */
1470   int           major, minor;           /* HTTP version numbers */
1471   http_status_t status;                 /* Authorization status */
1472 #ifdef HAVE_LIBSSL
1473   SSL_CTX       *context;               /* Context for encryption */
1474   SSL           *conn;                  /* Connection for encryption */
1475 #endif /* HAVE_LIBSSL */
1476
1477
1478   DEBUG_printf(("httpUpdate(%p)\n", http));
1479
1480  /*
1481   * If we haven't issued any commands, then there is nothing to "update"...
1482   */
1483
1484   if (http->state == HTTP_WAITING)
1485     return (HTTP_CONTINUE);
1486
1487  /*
1488   * Grab all of the lines we can from the connection...
1489   */
1490
1491   while (httpGets(line, sizeof(line), http) != NULL)
1492   {
1493     DEBUG_puts(line);
1494
1495     if (line[0] == '\0')
1496     {
1497      /*
1498       * Blank line means the start of the data section (if any).  Return
1499       * the result code, too...
1500       *
1501       * If we get status 100 (HTTP_CONTINUE), then we *don't* change states.
1502       * Instead, we just return HTTP_CONTINUE to the caller and keep on
1503       * tryin'...
1504       */
1505
1506       if (http->status == HTTP_CONTINUE)
1507         return (http->status);
1508
1509 #ifdef HAVE_LIBSSL
1510       if (http->status == HTTP_SWITCHING_PROTOCOLS && !http->tls)
1511       {
1512         context = SSL_CTX_new(SSLv23_method());
1513         conn    = SSL_new(context);
1514
1515         SSL_set_fd(conn, http->fd);
1516         if (SSL_connect(conn) != 1)
1517         {
1518           SSL_CTX_free(context);
1519           SSL_free(conn);
1520
1521 #ifdef WIN32
1522           http->error  = WSAGetLastError();
1523 #else
1524           http->error  = errno;
1525 #endif /* WIN32 */
1526           http->status = HTTP_ERROR;
1527
1528 #ifdef WIN32
1529           closesocket(http->fd);
1530 #else
1531           close(http->fd);
1532 #endif
1533
1534           return (HTTP_ERROR);
1535         }
1536
1537         http->tls = conn;
1538
1539         return (HTTP_CONTINUE);
1540       }
1541 #endif /* HAVE_LIBSSL */
1542
1543       httpGetLength(http);
1544
1545       switch (http->state)
1546       {
1547         case HTTP_GET :
1548         case HTTP_POST :
1549         case HTTP_POST_RECV :
1550         case HTTP_PUT :
1551             http->state ++;
1552             break;
1553
1554         default :
1555             http->state = HTTP_WAITING;
1556             break;
1557       }
1558
1559       return (http->status);
1560     }
1561     else if (strncmp(line, "HTTP/", 5) == 0)
1562     {
1563      /*
1564       * Got the beginning of a response...
1565       */
1566
1567       if (sscanf(line, "HTTP/%d.%d%d", &major, &minor, (int *)&status) != 3)
1568         return (HTTP_ERROR);
1569
1570       http->version = (http_version_t)(major * 100 + minor);
1571       http->status  = status;
1572     }
1573     else if ((value = strchr(line, ':')) != NULL)
1574     {
1575      /*
1576       * Got a value...
1577       */
1578
1579       *value++ = '\0';
1580       while (isspace(*value))
1581         value ++;
1582
1583      /*
1584       * Be tolerants of servers that send unknown attribute fields...
1585       */
1586
1587       if ((field = http_field(line)) == HTTP_FIELD_UNKNOWN)
1588       {
1589         DEBUG_printf(("httpUpdate: unknown field %s seen!\n", line));
1590         continue;
1591       }
1592
1593       httpSetField(http, field, value);
1594     }
1595     else
1596     {
1597       http->status = HTTP_ERROR;
1598       return (HTTP_ERROR);
1599     }
1600   }
1601
1602  /*
1603   * See if there was an error...
1604   */
1605
1606   if (http->error)
1607   {
1608     http->status = HTTP_ERROR;
1609     return (HTTP_ERROR);
1610   }
1611
1612  /*
1613   * If we haven't already returned, then there is nothing new...
1614   */
1615
1616   return (HTTP_CONTINUE);
1617 }
1618
1619
1620 /*
1621  * 'httpDecode64()' - Base64-decode a string.
1622  */
1623
1624 char *                          /* O - Decoded string */
1625 httpDecode64(char       *out,   /* I - String to write to */
1626              const char *in)    /* I - String to read from */
1627 {
1628   int   pos,                    /* Bit position */
1629         base64;                 /* Value of this character */
1630   char  *outptr;                /* Output pointer */
1631
1632
1633   for (outptr = out, pos = 0; *in != '\0'; in ++)
1634   {
1635    /*
1636     * Decode this character into a number from 0 to 63...
1637     */
1638
1639     if (*in >= 'A' && *in <= 'Z')
1640       base64 = *in - 'A';
1641     else if (*in >= 'a' && *in <= 'z')
1642       base64 = *in - 'a' + 26;
1643     else if (*in >= '0' && *in <= '9')
1644       base64 = *in - '0' + 52;
1645     else if (*in == '+')
1646       base64 = 62;
1647     else if (*in == '/')
1648       base64 = 63;
1649     else if (*in == '=')
1650       break;
1651     else
1652       continue;
1653
1654    /*
1655     * Store the result in the appropriate chars...
1656     */
1657
1658     switch (pos)
1659     {
1660       case 0 :
1661           *outptr = base64 << 2;
1662           pos ++;
1663           break;
1664       case 1 :
1665           *outptr++ |= (base64 >> 4) & 3;
1666           *outptr = (base64 << 4) & 255;
1667           pos ++;
1668           break;
1669       case 2 :
1670           *outptr++ |= (base64 >> 2) & 15;
1671           *outptr = (base64 << 6) & 255;
1672           pos ++;
1673           break;
1674       case 3 :
1675           *outptr++ |= base64;
1676           pos = 0;
1677           break;
1678     }
1679   }
1680
1681   *outptr = '\0';
1682
1683  /*
1684   * Return the decoded string...
1685   */
1686
1687   return (out);
1688 }
1689
1690
1691 /*
1692  * 'httpEncode64()' - Base64-encode a string.
1693  */
1694
1695 char *                          /* O - Encoded string */
1696 httpEncode64(char       *out,   /* I - String to write to */
1697              const char *in)    /* I - String to read from */
1698 {
1699   char          *outptr;        /* Output pointer */
1700   static char   base64[] =      /* Base64 characters... */
1701                 {
1702                   "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1703                   "abcdefghijklmnopqrstuvwxyz"
1704                   "0123456789"
1705                   "+/"
1706                 };
1707
1708
1709   for (outptr = out; *in != '\0'; in ++)
1710   {
1711    /*
1712     * Encode the up to 3 characters as 4 Base64 numbers...
1713     */
1714
1715     *outptr ++ = base64[in[0] >> 2];
1716     *outptr ++ = base64[((in[0] << 4) | (in[1] >> 4)) & 63];
1717
1718     in ++;
1719     if (*in == '\0')
1720     {
1721       *outptr ++ = '=';
1722       break;
1723     }
1724
1725     *outptr ++ = base64[((in[0] << 2) | (in[1] >> 6)) & 63];
1726
1727     in ++;
1728     if (*in == '\0')
1729       break;
1730
1731     *outptr ++ = base64[in[0] & 63];
1732   }
1733
1734   *outptr ++ = '=';
1735   *outptr = '\0';
1736
1737  /*
1738   * Return the encoded string...
1739   */
1740
1741   return (out);
1742 }
1743
1744
1745 /*
1746  * 'httpGetLength()' - Get the amount of data remaining from the
1747  *                     content-length or transfer-encoding fields.
1748  */
1749
1750 int                             /* O - Content length */
1751 httpGetLength(http_t *http)     /* I - HTTP data */
1752 {
1753   DEBUG_printf(("httpGetLength(%p)\n", http));
1754
1755   if (strcasecmp(http->fields[HTTP_FIELD_TRANSFER_ENCODING], "chunked") == 0)
1756   {
1757     DEBUG_puts("httpGetLength: chunked request!");
1758
1759     http->data_encoding  = HTTP_ENCODE_CHUNKED;
1760     http->data_remaining = 0;
1761   }
1762   else
1763   {
1764     http->data_encoding = HTTP_ENCODE_LENGTH;
1765
1766    /*
1767     * The following is a hack for HTTP servers that don't send a
1768     * content-length or transfer-encoding field...
1769     *
1770     * If there is no content-length then the connection must close
1771     * after the transfer is complete...
1772     */
1773
1774     if (http->fields[HTTP_FIELD_CONTENT_LENGTH][0] == '\0')
1775       http->data_remaining = 2147483647;
1776     else
1777       http->data_remaining = atoi(http->fields[HTTP_FIELD_CONTENT_LENGTH]);
1778
1779     DEBUG_printf(("httpGetLength: content_length = %d\n", http->data_remaining));
1780   }
1781
1782   return (http->data_remaining);
1783 }
1784
1785
1786 /*
1787  * 'http_field()' - Return the field index for a field name.
1788  */
1789
1790 static http_field_t             /* O - Field index */
1791 http_field(const char *name)    /* I - String name */
1792 {
1793   int   i;                      /* Looping var */
1794
1795
1796   for (i = 0; i < HTTP_FIELD_MAX; i ++)
1797     if (strcasecmp(name, http_fields[i]) == 0)
1798       return ((http_field_t)i);
1799
1800   return (HTTP_FIELD_UNKNOWN);
1801 }
1802
1803
1804 /*
1805  * 'http_send()' - Send a request with all fields and the trailing blank line.
1806  */
1807
1808 static int                      /* O - 0 on success, non-zero on error */
1809 http_send(http_t       *http,   /* I - HTTP data */
1810           http_state_t request, /* I - Request code */
1811           const char   *uri)    /* I - URI */
1812 {
1813   int           i;              /* Looping var */
1814   char          *ptr,           /* Pointer in buffer */
1815                 buf[1024];      /* Encoded URI buffer */
1816   static const char *codes[] =  /* Request code strings */
1817                 {
1818                   NULL,
1819                   "OPTIONS",
1820                   "GET",
1821                   NULL,
1822                   "HEAD",
1823                   "POST",
1824                   NULL,
1825                   NULL,
1826                   "PUT",
1827                   NULL,
1828                   "DELETE",
1829                   "TRACE",
1830                   "CLOSE"
1831                 };
1832   static const char *hex = "0123456789ABCDEF";
1833                                 /* Hex digits */
1834
1835
1836   if (http == NULL || uri == NULL)
1837     return (-1);
1838
1839  /*
1840   * Encode the URI as needed...
1841   */
1842
1843   for (ptr = buf; *uri != '\0' && ptr < (buf + sizeof(buf) - 1); uri ++)
1844     if (*uri <= ' ' || *uri >= 127)
1845     {
1846       if (ptr < (buf + sizeof(buf) - 1))
1847         *ptr ++ = '%';
1848       if (ptr < (buf + sizeof(buf) - 1))
1849         *ptr ++ = hex[(*uri >> 4) & 15];
1850       if (ptr < (buf + sizeof(buf) - 1))
1851         *ptr ++ = hex[*uri & 15];
1852     }
1853     else
1854       *ptr ++ = *uri;
1855
1856   *ptr = '\0';
1857
1858  /*
1859   * See if we had an error the last time around; if so, reconnect...
1860   */
1861
1862   if (http->status == HTTP_ERROR || http->status >= HTTP_BAD_REQUEST)
1863     httpReconnect(http);
1864
1865  /*
1866   * Send the request header...
1867   */
1868
1869   http->state = request;
1870   if (request == HTTP_POST || request == HTTP_PUT)
1871     http->state ++;
1872
1873   http->status = HTTP_CONTINUE;
1874
1875 #ifdef HAVE_LIBSSL
1876   if (http->encryption == HTTP_ENCRYPT_REQUIRED && !http->tls)
1877   {
1878     httpSetField(http, HTTP_FIELD_CONNECTION, "Upgrade");
1879     httpSetField(http, HTTP_FIELD_UPGRADE, "TLS/1.0,SSL/2.0,SSL/3.0");
1880   }
1881 #endif /* HAVE_LIBSSL */
1882
1883   if (httpPrintf(http, "%s %s HTTP/1.1\r\n", codes[request], buf) < 1)
1884   {
1885     http->status = HTTP_ERROR;
1886     return (-1);
1887   }
1888
1889   for (i = 0; i < HTTP_FIELD_MAX; i ++)
1890     if (http->fields[i][0] != '\0')
1891     {
1892       DEBUG_printf(("%s: %s\n", http_fields[i], http->fields[i]));
1893
1894       if (httpPrintf(http, "%s: %s\r\n", http_fields[i], http->fields[i]) < 1)
1895       {
1896         http->status = HTTP_ERROR;
1897         return (-1);
1898       }
1899     }
1900
1901   if (httpPrintf(http, "\r\n") < 1)
1902   {
1903     http->status = HTTP_ERROR;
1904     return (-1);
1905   }
1906
1907   httpClearFields(http);
1908
1909   return (0);
1910 }
1911
1912
1913 #ifdef HAVE_LIBSSL
1914 /*
1915  * 'http_upgrade()' - Force upgrade to TLS encryption.
1916  */
1917
1918 static int                      /* O - Status of connection */
1919 http_upgrade(http_t *http)      /* I - HTTP data */
1920 {
1921   int           ret;            /* Return value */
1922   http_t        myhttp;         /* Local copy of HTTP data */
1923
1924
1925   DEBUG_printf(("http_upgrade(%p)\n", http));
1926
1927  /*
1928   * Copy the HTTP data to a local variable so we can do the OPTIONS
1929   * request without interfering with the existing request data...
1930   */
1931
1932   memcpy(&myhttp, http, sizeof(myhttp));
1933
1934  /*
1935   * Send an OPTIONS request to the server, requiring SSL or TLS
1936   * encryption on the link...
1937   */
1938
1939   httpClearFields(&myhttp);
1940   httpSetField(&myhttp, HTTP_FIELD_CONNECTION, "upgrade");
1941   httpSetField(&myhttp, HTTP_FIELD_UPGRADE, "TLS/1.0, SSL/2.0, SSL/3.0");
1942
1943   if ((ret = httpOptions(&myhttp, "*")) == 0)
1944   {
1945    /*
1946     * Wait for the secure connection...
1947     */
1948
1949     while (httpUpdate(&myhttp) == HTTP_CONTINUE);
1950   }
1951
1952   httpFlush(&myhttp);
1953
1954  /*
1955   * Copy the HTTP data back over, if any...
1956   */
1957
1958   http->fd         = myhttp.fd;
1959   http->error      = myhttp.error;
1960   http->activity   = myhttp.activity;
1961   http->status     = myhttp.status;
1962   http->version    = myhttp.version;
1963   http->keep_alive = myhttp.keep_alive;
1964   http->used       = myhttp.used;
1965
1966   if (http->used)
1967     memcpy(http->buffer, myhttp.buffer, http->used);
1968
1969   http->auth_type   = myhttp.auth_type;
1970   http->nonce_count = myhttp.nonce_count;
1971
1972   memcpy(http->nonce, myhttp.nonce, sizeof(http->nonce));
1973
1974   http->tls        = myhttp.tls;
1975   http->encryption = myhttp.encryption;
1976
1977  /*
1978   * See if we actually went secure...
1979   */
1980
1981   if (!http->tls)
1982   {
1983    /*
1984     * Server does not support HTTP upgrade...
1985     */
1986
1987     DEBUG_puts("Server does not support HTTP upgrade!");
1988
1989 #ifdef WIN32
1990     closesocket(http->fd);
1991 #else
1992     close(http->fd);
1993 #endif
1994
1995     http->fd = -1;
1996
1997     return (-1);
1998   }
1999   else
2000     return (ret);
2001 }
2002 #endif /* HAVE_LIBSSL */
2003
2004
2005 /*
2006  * End of "$Id: http.c,v 1.105 2002/10/30 20:04:56 mike Exp $".
2007  */