cups/request.c

   1 /*
   2  * "$Id: request.c 7946 2008-09-16 23:27:54Z mike $"
   3  *
   4  *   IPP utilities for CUPS.
   5  *
   6  *   Copyright 2007-2011 by Apple Inc.
   7  *   Copyright 1997-2007 by Easy Software Products.
   8  *
   9  *   These coded instructions, statements, and computer programs are the
  10  *   property of Apple Inc. and are protected by Federal copyright
  11  *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  12  *   which should have been included with this file.  If this file is
  13  *   file is missing or damaged, see the license at "http://www.cups.org/".
  14  *
  15  *   This file is subject to the Apple OS-Developed Software exception.
  16  *
  17  * Contents:
  18  *
  19  *   cupsDoFileRequest()    - Do an IPP request with a file.
  20  *   cupsDoIORequest()      - Do an IPP request with file descriptors.
  21  *   cupsDoRequest()        - Do an IPP request.
  22  *   cupsGetResponse()      - Get a response to an IPP request.
  23  *   cupsLastError()        - Return the last IPP status code.
  24  *   cupsLastErrorString()  - Return the last IPP status-message.
  25  *   _cupsNextDelay()       - Return the next retry delay value.
  26  *   cupsReadResponseData() - Read additional data after the IPP response.
  27  *   cupsSendRequest()      - Send an IPP request.
  28  *   cupsWriteRequestData() - Write additional data after an IPP request.
  29  *   _cupsConnect()         - Get the default server connection...
  30  *   _cupsSetError()        - Set the last IPP status code and status-message.
  31  *   _cupsSetHTTPError()    - Set the last error using the HTTP status.
  32  */
  33
  34 /*
  35  * Include necessary headers...
  36  */
  37
  38 #include "cups-private.h"
  39 #include <fcntl.h>
  40 #include <sys/stat.h>
  41 #if defined(WIN32) || defined(__EMX__)
  42 #  include <io.h>
  43 #else
  44 #  include <unistd.h>
  45 #endif /* WIN32 || __EMX__ */
  46 #ifndef O_BINARY
  47 #  define O_BINARY 0
  48 #endif /* O_BINARY */
  49
  50
  51 /*
  52  * 'cupsDoFileRequest()' - Do an IPP request with a file.
  53  *
  54  * This function sends the IPP request to the specified server, retrying
  55  * and authenticating as necessary.  The request is freed with @link ippDelete@
  56  * after receiving a valid IPP response.
  57  */
  58
  59 ipp_t *                                 /* O - Response data */
  60 cupsDoFileRequest(http_t     *http,     /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
  61                   ipp_t      *request,  /* I - IPP request */
  62                   const char *resource, /* I - HTTP resource for POST */
  63                   const char *filename) /* I - File to send or @code NULL@ for none */
  64 {
  65   ipp_t         *response;              /* IPP response data */
  66   int           infile;                 /* Input file */
  67
  68
  69   DEBUG_printf(("cupsDoFileRequest(http=%p, request=%p(%s), resource=\"%s\", "
  70                 "filename=\"%s\")", http, request,
  71                 request ? ippOpString(request->request.op.operation_id) : "?",
  72                 resource, filename));
  73
  74   if (filename)
  75   {
  76     if ((infile = open(filename, O_RDONLY | O_BINARY)) < 0)
  77     {
  78      /*
  79       * Can't get file information!
  80       */
  81
  82       _cupsSetError(errno == ENOENT ? IPP_NOT_FOUND : IPP_NOT_AUTHORIZED,
  83                     NULL, 0);
  84
  85       ippDelete(request);
  86
  87       return (NULL);
  88     }
  89   }
  90   else
  91     infile = -1;
  92
  93   response = cupsDoIORequest(http, request, resource, infile, -1);
  94
  95   if (infile >= 0)
  96     close(infile);
  97
  98   return (response);
  99 }
 100
 101
 102 /*
 103  * 'cupsDoIORequest()' - Do an IPP request with file descriptors.
 104  *
 105  * This function sends the IPP request to the specified server, retrying
 106  * and authenticating as necessary.  The request is freed with ippDelete()
 107  * after receiving a valid IPP response.
 108  *
 109  * If "infile" is a valid file descriptor, cupsDoIORequest() copies
 110  * all of the data from the file after the IPP request message.
 111  *
 112  * If "outfile" is a valid file descriptor, cupsDoIORequest() copies
 113  * all of the data after the IPP response message to the file.
 114  *
 115  * @since CUPS 1.3/Mac OS X 10.5@
 116  */
 117
 118 ipp_t *                                 /* O - Response data */
 119 cupsDoIORequest(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 120                 ipp_t      *request,    /* I - IPP request */
 121                 const char *resource,   /* I - HTTP resource for POST */
 122                 int        infile,      /* I - File to read from or -1 for none */
 123                 int        outfile)     /* I - File to write to or -1 for none */
 124 {
 125   ipp_t         *response = NULL;       /* IPP response data */
 126   size_t        length = 0;             /* Content-Length value */
 127   http_status_t status;                 /* Status of HTTP request */
 128   struct stat   fileinfo;               /* File information */
 129   int           bytes;                  /* Number of bytes read/written */
 130   char          buffer[32768];          /* Output buffer */
 131
 132
 133   DEBUG_printf(("cupsDoIORequest(http=%p, request=%p(%s), resource=\"%s\", "
 134                 "infile=%d, outfile=%d)", http, request,
 135                 request ? ippOpString(request->request.op.operation_id) : "?",
 136                 resource, infile, outfile));
 137
 138  /*
 139   * Range check input...
 140   */
 141
 142   if (!request || !resource)
 143   {
 144     ippDelete(request);
 145
 146     _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
 147
 148     return (NULL);
 149   }
 150
 151  /*
 152   * Get the default connection as needed...
 153   */
 154
 155   if (!http)
 156     if ((http = _cupsConnect()) == NULL)
 157     {
 158       ippDelete(request);
 159
 160       return (NULL);
 161     }
 162
 163  /*
 164   * See if we have a file to send...
 165   */
 166
 167   if (infile >= 0)
 168   {
 169     if (fstat(infile, &fileinfo))
 170     {
 171      /*
 172       * Can't get file information!
 173       */
 174
 175       _cupsSetError(errno == EBADF ? IPP_NOT_FOUND : IPP_NOT_AUTHORIZED,
 176                     NULL, 0);
 177
 178       ippDelete(request);
 179
 180       return (NULL);
 181     }
 182
 183 #ifdef WIN32
 184     if (fileinfo.st_mode & _S_IFDIR)
 185 #else
 186     if (S_ISDIR(fileinfo.st_mode))
 187 #endif /* WIN32 */
 188     {
 189      /*
 190       * Can't send a directory...
 191       */
 192
 193       ippDelete(request);
 194
 195       _cupsSetError(IPP_NOT_POSSIBLE, strerror(EISDIR), 0);
 196
 197       return (NULL);
 198     }
 199
 200 #ifndef WIN32
 201     if (!S_ISREG(fileinfo.st_mode))
 202       length = 0;                       /* Chunk when piping */
 203     else
 204 #endif /* !WIN32 */
 205     length = ippLength(request) + fileinfo.st_size;
 206   }
 207   else
 208     length = ippLength(request);
 209
 210   DEBUG_printf(("2cupsDoIORequest: Request length=%ld, total length=%ld",
 211                 (long)ippLength(request), (long)length));
 212
 213  /*
 214   * Clear any "Local" authentication data since it is probably stale...
 215   */
 216
 217   if (http->authstring && !strncmp(http->authstring, "Local ", 6))
 218     httpSetAuthString(http, NULL, NULL);
 219
 220  /*
 221   * Loop until we can send the request without authorization problems.
 222   */
 223
 224   while (response == NULL)
 225   {
 226     DEBUG_puts("2cupsDoIORequest: setup...");
 227
 228    /*
 229     * Send the request...
 230     */
 231
 232     status = cupsSendRequest(http, request, resource, length);
 233
 234     DEBUG_printf(("2cupsDoIORequest: status=%d", status));
 235
 236     if (status == HTTP_CONTINUE && request->state == IPP_DATA && infile >= 0)
 237     {
 238       DEBUG_puts("2cupsDoIORequest: file write...");
 239
 240      /*
 241       * Send the file with the request...
 242       */
 243
 244 #ifndef WIN32
 245       if (S_ISREG(fileinfo.st_mode))
 246 #endif /* WIN32 */
 247       lseek(infile, 0, SEEK_SET);
 248
 249       while ((bytes = (int)read(infile, buffer, sizeof(buffer))) > 0)
 250       {
 251         if (httpCheck(http))
 252         {
 253           _httpUpdate(http, &status);
 254
 255           if (status >= HTTP_MULTIPLE_CHOICES)
 256             break;
 257         }
 258
 259         if (httpWrite2(http, buffer, bytes) < bytes)
 260           break;
 261       }
 262     }
 263
 264    /*
 265     * Get the server's response...
 266     */
 267
 268     if (status == HTTP_CONTINUE || status == HTTP_OK)
 269     {
 270       response = cupsGetResponse(http, resource);
 271       status   = http->status;
 272     }
 273     else
 274       httpFlush(http);
 275
 276     DEBUG_printf(("2cupsDoIORequest: status=%d", status));
 277
 278     if (status == HTTP_ERROR ||
 279         (status >= HTTP_BAD_REQUEST && status != HTTP_UNAUTHORIZED &&
 280          status != HTTP_UPGRADE_REQUIRED))
 281     {
 282       _cupsSetHTTPError(status);
 283       break;
 284     }
 285
 286     if (response)
 287     {
 288       if (outfile >= 0)
 289       {
 290        /*
 291         * Write trailing data to file...
 292         */
 293
 294         while ((bytes = (int)httpRead2(http, buffer, sizeof(buffer))) > 0)
 295           if (write(outfile, buffer, bytes) < bytes)
 296             break;
 297       }
 298       else
 299       {
 300        /*
 301         * Flush any remaining data...
 302         */
 303
 304         httpFlush(http);
 305       }
 306     }
 307   }
 308
 309  /*
 310   * Delete the original request and return the response...
 311   */
 312
 313   ippDelete(request);
 314
 315   return (response);
 316 }
 317
 318
 319 /*
 320  * 'cupsDoRequest()' - Do an IPP request.
 321  *
 322  * This function sends the IPP request to the specified server, retrying
 323  * and authenticating as necessary.  The request is freed with ippDelete()
 324  * after receiving a valid IPP response.
 325  */
 326
 327 ipp_t *                                 /* O - Response data */
 328 cupsDoRequest(http_t     *http,         /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 329               ipp_t      *request,      /* I - IPP request */
 330               const char *resource)     /* I - HTTP resource for POST */
 331 {
 332   DEBUG_printf(("cupsDoRequest(http=%p, request=%p(%s), resource=\"%s\")",
 333                 http, request,
 334                 request ? ippOpString(request->request.op.operation_id) : "?",
 335                 resource));
 336
 337   return (cupsDoIORequest(http, request, resource, -1, -1));
 338 }
 339
 340
 341 /*
 342  * 'cupsGetResponse()' - Get a response to an IPP request.
 343  *
 344  * Use this function to get the response for an IPP request sent using
 345  * cupsSendDocument() or cupsSendRequest(). For requests that return
 346  * additional data, use httpRead() after getting a successful response.
 347  *
 348  * @since CUPS 1.4/Mac OS X 10.6@
 349  */
 350
 351 ipp_t *                                 /* O - Response or @code NULL@ on HTTP error */
 352 cupsGetResponse(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 353                 const char *resource)   /* I - HTTP resource for POST */
 354 {
 355   http_status_t status;                 /* HTTP status */
 356   ipp_state_t   state;                  /* IPP read state */
 357   ipp_t         *response = NULL;       /* IPP response */
 358
 359
 360   DEBUG_printf(("cupsGetResponse(http=%p, resource=\"%s\")", http, resource));
 361
 362  /*
 363   * Connect to the default server as needed...
 364   */
 365
 366   if (!http)
 367     http = _cupsConnect();
 368
 369   if (!http || (http->state != HTTP_POST_RECV && http->state != HTTP_POST_SEND))
 370     return (NULL);
 371
 372  /*
 373   * Check for an unfinished chunked request...
 374   */
 375
 376   if (http->data_encoding == HTTP_ENCODE_CHUNKED)
 377   {
 378    /*
 379     * Send a 0-length chunk to finish off the request...
 380     */
 381
 382     DEBUG_puts("2cupsGetResponse: Finishing chunked POST...");
 383
 384     if (httpWrite2(http, "", 0) < 0)
 385       return (NULL);
 386   }
 387
 388  /*
 389   * Wait for a response from the server...
 390   */
 391
 392   DEBUG_printf(("2cupsGetResponse: Update loop, http->status=%d...",
 393                 http->status));
 394
 395   do
 396   {
 397     status = httpUpdate(http);
 398   }
 399   while (status != HTTP_ERROR && http->state == HTTP_POST_RECV);
 400
 401   DEBUG_printf(("2cupsGetResponse: status=%d", status));
 402
 403   if (status == HTTP_OK)
 404   {
 405    /*
 406     * Get the IPP response...
 407     */
 408
 409     response = ippNew();
 410
 411     while ((state = ippRead(http, response)) != IPP_DATA)
 412       if (state == IPP_ERROR)
 413         break;
 414
 415     if (state == IPP_ERROR)
 416     {
 417      /*
 418       * Flush remaining data and delete the response...
 419       */
 420
 421       DEBUG_puts("1cupsGetResponse: IPP read error!");
 422
 423       httpFlush(http);
 424
 425       ippDelete(response);
 426       response = NULL;
 427
 428       _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 429     }
 430   }
 431   else if (status != HTTP_ERROR)
 432   {
 433    /*
 434     * Flush any error message...
 435     */
 436
 437     httpFlush(http);
 438
 439    /*
 440     * Then handle encryption and authentication...
 441     */
 442
 443     if (status == HTTP_UNAUTHORIZED)
 444     {
 445      /*
 446       * See if we can do authentication...
 447       */
 448
 449       DEBUG_puts("2cupsGetResponse: Need authorization...");
 450
 451       if (!cupsDoAuthentication(http, "POST", resource))
 452         httpReconnect(http);
 453       else
 454         status = HTTP_AUTHORIZATION_CANCELED;
 455     }
 456
 457 #ifdef HAVE_SSL
 458     else if (status == HTTP_UPGRADE_REQUIRED)
 459     {
 460      /*
 461       * Force a reconnect with encryption...
 462       */
 463
 464       DEBUG_puts("2cupsGetResponse: Need encryption...");
 465
 466       if (!httpReconnect(http))
 467         httpEncryption(http, HTTP_ENCRYPT_REQUIRED);
 468     }
 469 #endif /* HAVE_SSL */
 470   }
 471
 472   if (response)
 473   {
 474     ipp_attribute_t     *attr;          /* status-message attribute */
 475
 476
 477     attr = ippFindAttribute(response, "status-message", IPP_TAG_TEXT);
 478
 479     DEBUG_printf(("1cupsGetResponse: status-code=%s, status-message=\"%s\"",
 480                   ippErrorString(response->request.status.status_code),
 481                   attr ? attr->values[0].string.text : ""));
 482
 483     _cupsSetError(response->request.status.status_code,
 484                   attr ? attr->values[0].string.text :
 485                       ippErrorString(response->request.status.status_code), 0);
 486   }
 487   else if (status != HTTP_OK)
 488     _cupsSetHTTPError(status);
 489
 490   return (response);
 491 }
 492
 493
 494 /*
 495  * 'cupsLastError()' - Return the last IPP status code.
 496  */
 497
 498 ipp_status_t                            /* O - IPP status code from last request */
 499 cupsLastError(void)
 500 {
 501   return (_cupsGlobals()->last_error);
 502 }
 503
 504
 505 /*
 506  * 'cupsLastErrorString()' - Return the last IPP status-message.
 507  *
 508  * @since CUPS 1.2/Mac OS X 10.5@
 509  */
 510
 511 const char *                            /* O - status-message text from last request */
 512 cupsLastErrorString(void)
 513 {
 514   return (_cupsGlobals()->last_status_message);
 515 }
 516
 517
 518 /*
 519  * '_cupsNextDelay()' - Return the next retry delay value.
 520  *
 521  * This function currently returns the Fibonacci sequence 1 1 2 3 5 8.
 522  *
 523  * Pass 0 for the current delay value to initialize the sequence.
 524  */
 525
 526 int                                     /* O  - Next delay value */
 527 _cupsNextDelay(int current,             /* I  - Current delay value or 0 */
 528                int *previous)           /* IO - Previous delay value */
 529 {
 530   int   next;                           /* Next delay value */
 531
 532
 533   if (current > 0)
 534   {
 535     next      = (current + *previous) % 12;
 536     *previous = next < current ? 0 : current;
 537   }
 538   else
 539   {
 540     next      = 1;
 541     *previous = 0;
 542   }
 543
 544   return (next);
 545 }
 546
 547
 548 /*
 549  * 'cupsReadResponseData()' - Read additional data after the IPP response.
 550  *
 551  * This function is used after cupsGetResponse() to read the PPD or document
 552  * files for CUPS_GET_PPD and CUPS_GET_DOCUMENT requests, respectively.
 553  *
 554  * @since CUPS 1.4/Mac OS X 10.6@
 555  */
 556
 557 ssize_t                                 /* O - Bytes read, 0 on EOF, -1 on error */
 558 cupsReadResponseData(
 559     http_t *http,                       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 560     char   *buffer,                     /* I - Buffer to use */
 561     size_t length)                      /* I - Number of bytes to read */
 562 {
 563  /*
 564   * Get the default connection as needed...
 565   */
 566
 567   DEBUG_printf(("cupsReadResponseData(http=%p, buffer=%p, "
 568                 "length=" CUPS_LLFMT ")", http, buffer, CUPS_LLCAST length));
 569
 570   if (!http)
 571   {
 572     _cups_globals_t *cg = _cupsGlobals();
 573                                         /* Pointer to library globals */
 574
 575     if ((http = cg->http) == NULL)
 576     {
 577       _cupsSetError(IPP_INTERNAL_ERROR, _("No active connection"), 1);
 578       return (-1);
 579     }
 580   }
 581
 582  /*
 583   * Then read from the HTTP connection...
 584   */
 585
 586   return (httpRead2(http, buffer, length));
 587 }
 588
 589
 590 /*
 591  * 'cupsSendRequest()' - Send an IPP request.
 592  *
 593  * Use httpWrite() to write any additional data (document, PPD file, etc.)
 594  * for the request, cupsGetResponse() to get the IPP response, and httpRead()
 595  * to read any additional data following the response. Only one request can be
 596  * sent/queued at a time.
 597  *
 598  * Unlike cupsDoFileRequest(), cupsDoIORequest(), and cupsDoRequest(), the
 599  * request is not freed.
 600  *
 601  * @since CUPS 1.4/Mac OS X 10.6@
 602  */
 603
 604 http_status_t                           /* O - Initial HTTP status */
 605 cupsSendRequest(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 606                 ipp_t      *request,    /* I - IPP request */
 607                 const char *resource,   /* I - Resource path */
 608                 size_t     length)      /* I - Length of data to follow or @code CUPS_LENGTH_VARIABLE@ */
 609 {
 610   http_status_t status;                 /* Status of HTTP request */
 611   int           got_status;             /* Did we get the status? */
 612   ipp_state_t   state;                  /* State of IPP processing */
 613   http_status_t expect;                 /* Expect: header to use */
 614
 615
 616   DEBUG_printf(("cupsSendRequest(http=%p, request=%p(%s), resource=\"%s\", "
 617                 "length=" CUPS_LLFMT ")", http, request,
 618                 request ? ippOpString(request->request.op.operation_id) : "?",
 619                 resource, CUPS_LLCAST length));
 620
 621  /*
 622   * Range check input...
 623   */
 624
 625   if (!request || !resource)
 626   {
 627     _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
 628
 629     return (HTTP_ERROR);
 630   }
 631
 632  /*
 633   * Get the default connection as needed...
 634   */
 635
 636   if (!http)
 637     if ((http = _cupsConnect()) == NULL)
 638       return (HTTP_SERVICE_UNAVAILABLE);
 639
 640 #ifdef HAVE_SSL
 641  /*
 642   * See if we have an auth-info attribute and are communicating over
 643   * a non-local link.  If so, encrypt the link so that we can pass
 644   * the authentication information securely...
 645   */
 646
 647   if (ippFindAttribute(request, "auth-info", IPP_TAG_TEXT) &&
 648       !httpAddrLocalhost(http->hostaddr) && !http->tls &&
 649       httpEncryption(http, HTTP_ENCRYPT_REQUIRED))
 650   {
 651     _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 652     return (HTTP_SERVICE_UNAVAILABLE);
 653   }
 654 #endif /* HAVE_SSL */
 655
 656  /*
 657   * Reconnect if the last response had a "Connection: close"...
 658   */
 659
 660   if (!_cups_strcasecmp(http->fields[HTTP_FIELD_CONNECTION], "close"))
 661     if (httpReconnect(http))
 662     {
 663       _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 664       return (HTTP_SERVICE_UNAVAILABLE);
 665     }
 666
 667  /*
 668   * Loop until we can send the request without authorization problems.
 669   */
 670
 671   expect = HTTP_CONTINUE;
 672
 673   for (;;)
 674   {
 675     DEBUG_puts("2cupsSendRequest: Setup...");
 676
 677    /*
 678     * Setup the HTTP variables needed...
 679     */
 680
 681     httpClearFields(http);
 682     httpSetExpect(http, expect);
 683     httpSetField(http, HTTP_FIELD_CONTENT_TYPE, "application/ipp");
 684     httpSetLength(http, length);
 685
 686 #ifdef HAVE_GSSAPI
 687     if (http->authstring && !strncmp(http->authstring, "Negotiate", 9))
 688     {
 689      /*
 690       * Do not use cached Kerberos credentials since they will look like a
 691       * "replay" attack...
 692       */
 693
 694       _cupsSetNegotiateAuthString(http, "POST", resource);
 695     }
 696 #endif /* HAVE_GSSAPI */
 697
 698     httpSetField(http, HTTP_FIELD_AUTHORIZATION, http->authstring);
 699
 700     DEBUG_printf(("2cupsSendRequest: authstring=\"%s\"", http->authstring));
 701
 702    /*
 703     * Try the request...
 704     */
 705
 706     DEBUG_puts("2cupsSendRequest: Sending HTTP POST...");
 707
 708     if (httpPost(http, resource))
 709     {
 710       if (httpReconnect(http))
 711       {
 712         _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 713         return (HTTP_SERVICE_UNAVAILABLE);
 714       }
 715       else
 716         continue;
 717     }
 718
 719    /*
 720     * Send the IPP data...
 721     */
 722
 723     DEBUG_puts("2cupsSendRequest: Writing IPP request...");
 724
 725     request->state = IPP_IDLE;
 726     status         = HTTP_CONTINUE;
 727     got_status     = 0;
 728
 729     while ((state = ippWrite(http, request)) != IPP_DATA)
 730       if (state == IPP_ERROR)
 731         break;
 732       else if (httpCheck(http))
 733       {
 734         got_status = 1;
 735
 736         _httpUpdate(http, &status);
 737         if (status >= HTTP_MULTIPLE_CHOICES)
 738           break;
 739       }
 740
 741     if (state == IPP_ERROR)
 742     {
 743       http->status = HTTP_ERROR;
 744       http->state  = HTTP_WAITING;
 745
 746       return (HTTP_ERROR);
 747     }
 748
 749    /*
 750     * Wait up to 1 second to get the 100-continue response as needed...
 751     */
 752
 753     if (!got_status)
 754     {
 755       if (expect == HTTP_CONTINUE)
 756       {
 757         DEBUG_puts("2cupsSendRequest: Waiting for 100-continue...");
 758
 759         if (httpWait(http, 1000))
 760           _httpUpdate(http, &status);
 761       }
 762       else if (httpCheck(http))
 763         _httpUpdate(http, &status);
 764     }
 765
 766     DEBUG_printf(("2cupsSendRequest: status=%d", status));
 767
 768    /*
 769     * Process the current HTTP status...
 770     */
 771
 772     if (status >= HTTP_MULTIPLE_CHOICES)
 773       httpFlush(http);
 774
 775     switch (status)
 776     {
 777       case HTTP_ERROR :
 778       case HTTP_CONTINUE :
 779       case HTTP_OK :
 780           return (status);
 781
 782       case HTTP_UNAUTHORIZED :
 783           if (cupsDoAuthentication(http, "POST", resource))
 784             return (HTTP_AUTHORIZATION_CANCELED);
 785
 786           if (httpReconnect(http))
 787           {
 788             _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 789             return (HTTP_SERVICE_UNAVAILABLE);
 790           }
 791           break;
 792
 793 #ifdef HAVE_SSL
 794       case HTTP_UPGRADE_REQUIRED :
 795          /*
 796           * Flush any error message, reconnect, and then upgrade with
 797           * encryption...
 798           */
 799
 800           if (httpReconnect(http))
 801           {
 802             _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 803             return (HTTP_SERVICE_UNAVAILABLE);
 804           }
 805
 806           if (httpEncryption(http, HTTP_ENCRYPT_REQUIRED))
 807           {
 808             _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 809             return (HTTP_SERVICE_UNAVAILABLE);
 810           }
 811           break;
 812 #endif /* HAVE_SSL */
 813
 814       case HTTP_EXPECTATION_FAILED :
 815          /*
 816           * Don't try using the Expect: header the next time around...
 817           */
 818
 819           expect = (http_status_t)0;
 820
 821           if (httpReconnect(http))
 822           {
 823             _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 824             return (HTTP_SERVICE_UNAVAILABLE);
 825           }
 826           break;
 827
 828       default :
 829          /*
 830           * Some other error...
 831           */
 832
 833           return (status);
 834     }
 835   }
 836 }
 837
 838
 839 /*
 840  * 'cupsWriteRequestData()' - Write additional data after an IPP request.
 841  *
 842  * This function is used after @link cupsSendRequest@ to provide a PPD and
 843  * after @link cupsStartDocument@ to provide a document file.
 844  *
 845  * @since CUPS 1.4/Mac OS X 10.6@
 846  */
 847
 848 http_status_t                           /* O - @code HTTP_CONTINUE@ if OK or HTTP status on error */
 849 cupsWriteRequestData(
 850     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 851     const char *buffer,                 /* I - Bytes to write */
 852     size_t     length)                  /* I - Number of bytes to write */
 853 {
 854   int   wused;                          /* Previous bytes in buffer */
 855
 856
 857  /*
 858   * Get the default connection as needed...
 859   */
 860
 861   DEBUG_printf(("cupsWriteRequestData(http=%p, buffer=%p, "
 862                 "length=" CUPS_LLFMT ")", http, buffer, CUPS_LLCAST length));
 863
 864   if (!http)
 865   {
 866     _cups_globals_t *cg = _cupsGlobals();
 867                                         /* Pointer to library globals */
 868
 869     if ((http = cg->http) == NULL)
 870     {
 871       _cupsSetError(IPP_INTERNAL_ERROR, _("No active connection"), 1);
 872       DEBUG_puts("1cupsWriteRequestData: Returning HTTP_ERROR.");
 873       return (HTTP_ERROR);
 874     }
 875   }
 876
 877  /*
 878   * Then write to the HTTP connection...
 879   */
 880
 881   wused = http->wused;
 882
 883   if (httpWrite2(http, buffer, length) < 0)
 884   {
 885     DEBUG_puts("1cupsWriteRequestData: Returning HTTP_ERROR.");
 886     _cupsSetError(IPP_INTERNAL_ERROR, strerror(http->error), 0);
 887     return (HTTP_ERROR);
 888   }
 889
 890  /*
 891   * Finally, check if we have any pending data from the server...
 892   */
 893
 894   if (length >= HTTP_MAX_BUFFER ||
 895       http->wused < wused ||
 896       (wused > 0 && http->wused == length))
 897   {
 898    /*
 899     * We've written something to the server, so check for response data...
 900     */
 901
 902     if (_httpWait(http, 0, 1))
 903     {
 904       http_status_t     status;         /* Status from _httpUpdate */
 905
 906       _httpUpdate(http, &status);
 907       if (status >= HTTP_MULTIPLE_CHOICES)
 908       {
 909         _cupsSetHTTPError(status);
 910         httpFlush(http);
 911       }
 912
 913       DEBUG_printf(("1cupsWriteRequestData: Returning %d.\n", status));
 914       return (status);
 915     }
 916   }
 917
 918   DEBUG_puts("1cupsWriteRequestData: Returning HTTP_CONTINUE.");
 919   return (HTTP_CONTINUE);
 920 }
 921
 922
 923 /*
 924  * '_cupsConnect()' - Get the default server connection...
 925  */
 926
 927 http_t *                                /* O - HTTP connection */
 928 _cupsConnect(void)
 929 {
 930   _cups_globals_t *cg = _cupsGlobals(); /* Pointer to library globals */
 931
 932
 933  /*
 934   * See if we are connected to the same server...
 935   */
 936
 937   if (cg->http)
 938   {
 939    /*
 940     * Compare the connection hostname, port, and encryption settings to
 941     * the cached defaults; these were initialized the first time we
 942     * connected...
 943     */
 944
 945     if (strcmp(cg->http->hostname, cg->server) ||
 946         cg->ipp_port != _httpAddrPort(cg->http->hostaddr) ||
 947         (cg->http->encryption != cg->encryption &&
 948          cg->http->encryption == HTTP_ENCRYPT_NEVER))
 949     {
 950      /*
 951       * Need to close the current connection because something has changed...
 952       */
 953
 954       httpClose(cg->http);
 955       cg->http = NULL;
 956     }
 957   }
 958
 959  /*
 960   * (Re)connect as needed...
 961   */
 962
 963   if (!cg->http)
 964   {
 965     if ((cg->http = httpConnectEncrypt(cupsServer(), ippPort(),
 966                                        cupsEncryption())) == NULL)
 967     {
 968       if (errno)
 969         _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 970       else
 971         _cupsSetError(IPP_SERVICE_UNAVAILABLE,
 972                       _("Unable to connect to host."), 1);
 973     }
 974   }
 975
 976  /*
 977   * Return the cached connection...
 978   */
 979
 980   return (cg->http);
 981 }
 982
 983
 984 /*
 985  * '_cupsSetError()' - Set the last IPP status code and status-message.
 986  */
 987
 988 void
 989 _cupsSetError(ipp_status_t status,      /* I - IPP status code */
 990               const char   *message,    /* I - status-message value */
 991               int          localize)    /* I - Localize the message? */
 992 {
 993   _cups_globals_t       *cg;            /* Global data */
 994
 995
 996   if (!message && errno)
 997   {
 998     message  = strerror(errno);
 999     localize = 0;
1000   }
1001
1002   cg             = _cupsGlobals();
1003   cg->last_error = status;
1004
1005   if (cg->last_status_message)
1006   {
1007     _cupsStrFree(cg->last_status_message);
1008
1009     cg->last_status_message = NULL;
1010   }
1011
1012   if (message)
1013   {
1014     if (localize)
1015     {
1016      /*
1017       * Get the message catalog...
1018       */
1019
1020       if (!cg->lang_default)
1021         cg->lang_default = cupsLangDefault();
1022
1023       cg->last_status_message = _cupsStrAlloc(_cupsLangString(cg->lang_default,
1024                                                               message));
1025     }
1026     else
1027       cg->last_status_message = _cupsStrAlloc(message);
1028   }
1029
1030   DEBUG_printf(("4_cupsSetError: last_error=%s, last_status_message=\"%s\"",
1031                 ippErrorString(cg->last_error), cg->last_status_message));
1032 }
1033
1034
1035 /*
1036  * '_cupsSetHTTPError()' - Set the last error using the HTTP status.
1037  */
1038
1039 void
1040 _cupsSetHTTPError(http_status_t status) /* I - HTTP status code */
1041 {
1042   switch (status)
1043   {
1044     case HTTP_NOT_FOUND :
1045         _cupsSetError(IPP_NOT_FOUND, httpStatus(status), 0);
1046         break;
1047
1048     case HTTP_UNAUTHORIZED :
1049         _cupsSetError(IPP_NOT_AUTHENTICATED, httpStatus(status), 0);
1050         break;
1051
1052     case HTTP_AUTHORIZATION_CANCELED :
1053         _cupsSetError(IPP_AUTHENTICATION_CANCELED, httpStatus(status), 0);
1054         break;
1055
1056     case HTTP_FORBIDDEN :
1057         _cupsSetError(IPP_FORBIDDEN, httpStatus(status), 0);
1058         break;
1059
1060     case HTTP_BAD_REQUEST :
1061         _cupsSetError(IPP_BAD_REQUEST, httpStatus(status), 0);
1062         break;
1063
1064     case HTTP_REQUEST_TOO_LARGE :
1065         _cupsSetError(IPP_REQUEST_VALUE, httpStatus(status), 0);
1066         break;
1067
1068     case HTTP_NOT_IMPLEMENTED :
1069         _cupsSetError(IPP_OPERATION_NOT_SUPPORTED, httpStatus(status), 0);
1070         break;
1071
1072     case HTTP_NOT_SUPPORTED :
1073         _cupsSetError(IPP_VERSION_NOT_SUPPORTED, httpStatus(status), 0);
1074         break;
1075
1076     case HTTP_UPGRADE_REQUIRED :
1077         _cupsSetError(IPP_UPGRADE_REQUIRED, httpStatus(status), 0);
1078         break;
1079
1080     case HTTP_PKI_ERROR :
1081         _cupsSetError(IPP_PKI_ERROR, httpStatus(status), 0);
1082         break;
1083
1084     case HTTP_ERROR :
1085         _cupsSetError(IPP_INTERNAL_ERROR, httpStatus(status), 0);
1086         break;
1087
1088     default :
1089         DEBUG_printf(("4_cupsSetHTTPError: HTTP error %d mapped to "
1090                       "IPP_SERVICE_UNAVAILABLE!", status));
1091         _cupsSetError(IPP_SERVICE_UNAVAILABLE, httpStatus(status), 0);
1092         break;
1093   }
1094 }
1095
1096
1097 /*
1098  * End of "$Id: request.c 7946 2008-09-16 23:27:54Z mike $".
1099  */