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 ((status = cupsWriteRequestData(http, buffer, bytes))
 252                 != HTTP_CONTINUE)
 253           break;
 254       }
 255     }
 256
 257    /*
 258     * Get the server's response...
 259     */
 260
 261     if (status != HTTP_ERROR)
 262     {
 263       response = cupsGetResponse(http, resource);
 264       status   = httpGetStatus(http);
 265     }
 266
 267     DEBUG_printf(("2cupsDoIORequest: status=%d", status));
 268
 269     if (status == HTTP_ERROR ||
 270         (status >= HTTP_BAD_REQUEST && status != HTTP_UNAUTHORIZED &&
 271          status != HTTP_UPGRADE_REQUIRED))
 272     {
 273       _cupsSetHTTPError(status);
 274       break;
 275     }
 276
 277     if (response && outfile >= 0)
 278     {
 279      /*
 280       * Write trailing data to file...
 281       */
 282
 283       while ((bytes = (int)httpRead2(http, buffer, sizeof(buffer))) > 0)
 284         if (write(outfile, buffer, bytes) < bytes)
 285           break;
 286     }
 287
 288     if (http->state != HTTP_WAITING)
 289     {
 290      /*
 291       * Flush any remaining data...
 292       */
 293
 294       httpFlush(http);
 295     }
 296   }
 297
 298  /*
 299   * Delete the original request and return the response...
 300   */
 301
 302   ippDelete(request);
 303
 304   return (response);
 305 }
 306
 307
 308 /*
 309  * 'cupsDoRequest()' - Do an IPP request.
 310  *
 311  * This function sends the IPP request to the specified server, retrying
 312  * and authenticating as necessary.  The request is freed with ippDelete()
 313  * after receiving a valid IPP response.
 314  */
 315
 316 ipp_t *                                 /* O - Response data */
 317 cupsDoRequest(http_t     *http,         /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 318               ipp_t      *request,      /* I - IPP request */
 319               const char *resource)     /* I - HTTP resource for POST */
 320 {
 321   DEBUG_printf(("cupsDoRequest(http=%p, request=%p(%s), resource=\"%s\")",
 322                 http, request,
 323                 request ? ippOpString(request->request.op.operation_id) : "?",
 324                 resource));
 325
 326   return (cupsDoIORequest(http, request, resource, -1, -1));
 327 }
 328
 329
 330 /*
 331  * 'cupsGetResponse()' - Get a response to an IPP request.
 332  *
 333  * Use this function to get the response for an IPP request sent using
 334  * cupsSendDocument() or cupsSendRequest(). For requests that return
 335  * additional data, use httpRead() after getting a successful response,
 336  * otherwise call httpFlush() to complete the response processing.
 337  *
 338  * @since CUPS 1.4/Mac OS X 10.6@
 339  */
 340
 341 ipp_t *                                 /* O - Response or @code NULL@ on HTTP error */
 342 cupsGetResponse(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 343                 const char *resource)   /* I - HTTP resource for POST */
 344 {
 345   http_status_t status;                 /* HTTP status */
 346   ipp_state_t   state;                  /* IPP read state */
 347   ipp_t         *response = NULL;       /* IPP response */
 348
 349
 350   DEBUG_printf(("cupsGetResponse(http=%p, resource=\"%s\")", http, resource));
 351
 352  /*
 353   * Connect to the default server as needed...
 354   */
 355
 356   if (!http)
 357     http = _cupsConnect();
 358
 359   if (!http || (http->state != HTTP_POST_RECV && http->state != HTTP_POST_SEND))
 360     return (NULL);
 361
 362  /*
 363   * Check for an unfinished chunked request...
 364   */
 365
 366   if (http->data_encoding == HTTP_ENCODE_CHUNKED)
 367   {
 368    /*
 369     * Send a 0-length chunk to finish off the request...
 370     */
 371
 372     DEBUG_puts("2cupsGetResponse: Finishing chunked POST...");
 373
 374     if (httpWrite2(http, "", 0) < 0)
 375       return (NULL);
 376   }
 377
 378  /*
 379   * Wait for a response from the server...
 380   */
 381
 382   DEBUG_printf(("2cupsGetResponse: Update loop, http->status=%d...",
 383                 http->status));
 384
 385   do
 386   {
 387     status = httpUpdate(http);
 388   }
 389   while (status != HTTP_ERROR && http->state == HTTP_POST_RECV);
 390
 391   DEBUG_printf(("2cupsGetResponse: status=%d", status));
 392
 393   if (status == HTTP_OK)
 394   {
 395    /*
 396     * Get the IPP response...
 397     */
 398
 399     response = ippNew();
 400
 401     while ((state = ippRead(http, response)) != IPP_DATA)
 402       if (state == IPP_ERROR)
 403         break;
 404
 405     if (state == IPP_ERROR)
 406     {
 407      /*
 408       * Flush remaining data and delete the response...
 409       */
 410
 411       DEBUG_puts("1cupsGetResponse: IPP read error!");
 412
 413       httpFlush(http);
 414
 415       ippDelete(response);
 416       response = NULL;
 417
 418       _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 419       http->status = status = HTTP_ERROR;
 420       http->error  = EIO;
 421     }
 422   }
 423   else if (status != HTTP_ERROR)
 424   {
 425    /*
 426     * Flush any error message...
 427     */
 428
 429     httpFlush(http);
 430
 431    /*
 432     * Then handle encryption and authentication...
 433     */
 434
 435     if (status == HTTP_UNAUTHORIZED)
 436     {
 437      /*
 438       * See if we can do authentication...
 439       */
 440
 441       DEBUG_puts("2cupsGetResponse: Need authorization...");
 442
 443       if (!cupsDoAuthentication(http, "POST", resource))
 444         httpReconnect(http);
 445       else
 446         http->status = status = HTTP_AUTHORIZATION_CANCELED;
 447     }
 448
 449 #ifdef HAVE_SSL
 450     else if (status == HTTP_UPGRADE_REQUIRED)
 451     {
 452      /*
 453       * Force a reconnect with encryption...
 454       */
 455
 456       DEBUG_puts("2cupsGetResponse: Need encryption...");
 457
 458       if (!httpReconnect(http))
 459         httpEncryption(http, HTTP_ENCRYPT_REQUIRED);
 460     }
 461 #endif /* HAVE_SSL */
 462   }
 463
 464   if (response)
 465   {
 466     ipp_attribute_t     *attr;          /* status-message attribute */
 467
 468
 469     attr = ippFindAttribute(response, "status-message", IPP_TAG_TEXT);
 470
 471     DEBUG_printf(("1cupsGetResponse: status-code=%s, status-message=\"%s\"",
 472                   ippErrorString(response->request.status.status_code),
 473                   attr ? attr->values[0].string.text : ""));
 474
 475     _cupsSetError(response->request.status.status_code,
 476                   attr ? attr->values[0].string.text :
 477                       ippErrorString(response->request.status.status_code), 0);
 478   }
 479   else if (status == HTTP_ERROR)
 480     _cupsSetError(IPP_INTERNAL_ERROR, strerror(http->error), 0);
 481   else if (status != HTTP_OK)
 482     _cupsSetHTTPError(status);
 483
 484   return (response);
 485 }
 486
 487
 488 /*
 489  * 'cupsLastError()' - Return the last IPP status code.
 490  */
 491
 492 ipp_status_t                            /* O - IPP status code from last request */
 493 cupsLastError(void)
 494 {
 495   return (_cupsGlobals()->last_error);
 496 }
 497
 498
 499 /*
 500  * 'cupsLastErrorString()' - Return the last IPP status-message.
 501  *
 502  * @since CUPS 1.2/Mac OS X 10.5@
 503  */
 504
 505 const char *                            /* O - status-message text from last request */
 506 cupsLastErrorString(void)
 507 {
 508   return (_cupsGlobals()->last_status_message);
 509 }
 510
 511
 512 /*
 513  * '_cupsNextDelay()' - Return the next retry delay value.
 514  *
 515  * This function currently returns the Fibonacci sequence 1 1 2 3 5 8.
 516  *
 517  * Pass 0 for the current delay value to initialize the sequence.
 518  */
 519
 520 int                                     /* O  - Next delay value */
 521 _cupsNextDelay(int current,             /* I  - Current delay value or 0 */
 522                int *previous)           /* IO - Previous delay value */
 523 {
 524   int   next;                           /* Next delay value */
 525
 526
 527   if (current > 0)
 528   {
 529     next      = (current + *previous) % 12;
 530     *previous = next < current ? 0 : current;
 531   }
 532   else
 533   {
 534     next      = 1;
 535     *previous = 0;
 536   }
 537
 538   return (next);
 539 }
 540
 541
 542 /*
 543  * 'cupsReadResponseData()' - Read additional data after the IPP response.
 544  *
 545  * This function is used after cupsGetResponse() to read the PPD or document
 546  * files for CUPS_GET_PPD and CUPS_GET_DOCUMENT requests, respectively.
 547  *
 548  * @since CUPS 1.4/Mac OS X 10.6@
 549  */
 550
 551 ssize_t                                 /* O - Bytes read, 0 on EOF, -1 on error */
 552 cupsReadResponseData(
 553     http_t *http,                       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 554     char   *buffer,                     /* I - Buffer to use */
 555     size_t length)                      /* I - Number of bytes to read */
 556 {
 557  /*
 558   * Get the default connection as needed...
 559   */
 560
 561   DEBUG_printf(("cupsReadResponseData(http=%p, buffer=%p, "
 562                 "length=" CUPS_LLFMT ")", http, buffer, CUPS_LLCAST length));
 563
 564   if (!http)
 565   {
 566     _cups_globals_t *cg = _cupsGlobals();
 567                                         /* Pointer to library globals */
 568
 569     if ((http = cg->http) == NULL)
 570     {
 571       _cupsSetError(IPP_INTERNAL_ERROR, _("No active connection"), 1);
 572       return (-1);
 573     }
 574   }
 575
 576  /*
 577   * Then read from the HTTP connection...
 578   */
 579
 580   return (httpRead2(http, buffer, length));
 581 }
 582
 583
 584 /*
 585  * 'cupsSendRequest()' - Send an IPP request.
 586  *
 587  * Use httpWrite() to write any additional data (document, PPD file, etc.)
 588  * for the request, cupsGetResponse() to get the IPP response, and httpRead()
 589  * to read any additional data following the response. Only one request can be
 590  * sent/queued at a time.
 591  *
 592  * Unlike cupsDoFileRequest(), cupsDoIORequest(), and cupsDoRequest(), the
 593  * request is not freed.
 594  *
 595  * @since CUPS 1.4/Mac OS X 10.6@
 596  */
 597
 598 http_status_t                           /* O - Initial HTTP status */
 599 cupsSendRequest(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 600                 ipp_t      *request,    /* I - IPP request */
 601                 const char *resource,   /* I - Resource path */
 602                 size_t     length)      /* I - Length of data to follow or @code CUPS_LENGTH_VARIABLE@ */
 603 {
 604   http_status_t status;                 /* Status of HTTP request */
 605   int           got_status;             /* Did we get the status? */
 606   ipp_state_t   state;                  /* State of IPP processing */
 607   http_status_t expect;                 /* Expect: header to use */
 608
 609
 610   DEBUG_printf(("cupsSendRequest(http=%p, request=%p(%s), resource=\"%s\", "
 611                 "length=" CUPS_LLFMT ")", http, request,
 612                 request ? ippOpString(request->request.op.operation_id) : "?",
 613                 resource, CUPS_LLCAST length));
 614
 615  /*
 616   * Range check input...
 617   */
 618
 619   if (!request || !resource)
 620   {
 621     _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
 622
 623     return (HTTP_ERROR);
 624   }
 625
 626  /*
 627   * Get the default connection as needed...
 628   */
 629
 630   if (!http)
 631     if ((http = _cupsConnect()) == NULL)
 632       return (HTTP_SERVICE_UNAVAILABLE);
 633
 634  /*
 635   * If the prior request was not flushed out, do so now...
 636   */
 637
 638   if (http->state == HTTP_GET_SEND ||
 639       http->state == HTTP_POST_SEND)
 640   {
 641     DEBUG_puts("2cupsSendRequest: Flush prior response.");
 642     httpFlush(http);
 643   }
 644   else if (http->state != HTTP_WAITING)
 645   {
 646     DEBUG_printf(("1cupsSendRequest: Unknown HTTP state (%d), bailing.",
 647                   http->state));
 648     _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
 649
 650     return (HTTP_ERROR);
 651   }
 652
 653 #ifdef HAVE_SSL
 654  /*
 655   * See if we have an auth-info attribute and are communicating over
 656   * a non-local link.  If so, encrypt the link so that we can pass
 657   * the authentication information securely...
 658   */
 659
 660   if (ippFindAttribute(request, "auth-info", IPP_TAG_TEXT) &&
 661       !httpAddrLocalhost(http->hostaddr) && !http->tls &&
 662       httpEncryption(http, HTTP_ENCRYPT_REQUIRED))
 663   {
 664     DEBUG_puts("1cupsSendRequest: Unable to encrypt connection.");
 665     return (HTTP_SERVICE_UNAVAILABLE);
 666   }
 667 #endif /* HAVE_SSL */
 668
 669  /*
 670   * Reconnect if the last response had a "Connection: close"...
 671   */
 672
 673   if (!_cups_strcasecmp(http->fields[HTTP_FIELD_CONNECTION], "close"))
 674   {
 675     DEBUG_puts("2cupsSendRequest: Connection: close");
 676     httpClearFields(http);
 677     if (httpReconnect(http))
 678     {
 679       DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 680       return (HTTP_SERVICE_UNAVAILABLE);
 681     }
 682   }
 683
 684  /*
 685   * Loop until we can send the request without authorization problems.
 686   */
 687
 688   expect = HTTP_CONTINUE;
 689
 690   for (;;)
 691   {
 692     DEBUG_puts("2cupsSendRequest: Setup...");
 693
 694    /*
 695     * Setup the HTTP variables needed...
 696     */
 697
 698     httpClearFields(http);
 699     httpSetExpect(http, expect);
 700     httpSetField(http, HTTP_FIELD_CONTENT_TYPE, "application/ipp");
 701     httpSetLength(http, length);
 702
 703 #ifdef HAVE_GSSAPI
 704     if (http->authstring && !strncmp(http->authstring, "Negotiate", 9))
 705     {
 706      /*
 707       * Do not use cached Kerberos credentials since they will look like a
 708       * "replay" attack...
 709       */
 710
 711       _cupsSetNegotiateAuthString(http, "POST", resource);
 712     }
 713 #endif /* HAVE_GSSAPI */
 714
 715     httpSetField(http, HTTP_FIELD_AUTHORIZATION, http->authstring);
 716
 717     DEBUG_printf(("2cupsSendRequest: authstring=\"%s\"", http->authstring));
 718
 719    /*
 720     * Try the request...
 721     */
 722
 723     DEBUG_puts("2cupsSendRequest: Sending HTTP POST...");
 724
 725     if (httpPost(http, resource))
 726     {
 727       DEBUG_puts("2cupsSendRequest: POST failed, reconnecting.");
 728       if (httpReconnect(http))
 729       {
 730         DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 731         return (HTTP_SERVICE_UNAVAILABLE);
 732       }
 733       else
 734         continue;
 735     }
 736
 737    /*
 738     * Send the IPP data...
 739     */
 740
 741     DEBUG_puts("2cupsSendRequest: Writing IPP request...");
 742
 743     request->state = IPP_IDLE;
 744     status         = HTTP_CONTINUE;
 745     got_status     = 0;
 746
 747     while ((state = ippWrite(http, request)) != IPP_DATA)
 748       if (state == IPP_ERROR)
 749         break;
 750       else if (httpCheck(http))
 751       {
 752         got_status = 1;
 753
 754         _httpUpdate(http, &status);
 755         if (status >= HTTP_MULTIPLE_CHOICES)
 756           break;
 757       }
 758
 759     if (state == IPP_ERROR)
 760     {
 761       DEBUG_puts("1cupsSendRequest: Unable to send IPP request.");
 762
 763       http->status = HTTP_ERROR;
 764       http->state  = HTTP_WAITING;
 765
 766       return (HTTP_ERROR);
 767     }
 768
 769    /*
 770     * Wait up to 1 second to get the 100-continue response as needed...
 771     */
 772
 773     if (!got_status)
 774     {
 775       if (expect == HTTP_CONTINUE)
 776       {
 777         DEBUG_puts("2cupsSendRequest: Waiting for 100-continue...");
 778
 779         if (httpWait(http, 1000))
 780           _httpUpdate(http, &status);
 781       }
 782       else if (httpCheck(http))
 783         _httpUpdate(http, &status);
 784     }
 785
 786     DEBUG_printf(("2cupsSendRequest: status=%d", status));
 787
 788    /*
 789     * Process the current HTTP status...
 790     */
 791
 792     if (status >= HTTP_MULTIPLE_CHOICES)
 793     {
 794       _cupsSetHTTPError(status);
 795
 796       do
 797       {
 798         status = httpUpdate(http);
 799       }
 800       while (status != HTTP_ERROR && http->state == HTTP_POST_RECV);
 801
 802       httpFlush(http);
 803     }
 804
 805     switch (status)
 806     {
 807       case HTTP_ERROR :
 808       case HTTP_CONTINUE :
 809       case HTTP_OK :
 810           DEBUG_printf(("1cupsSendRequest: Returning %d.", status));
 811           return (status);
 812
 813       case HTTP_UNAUTHORIZED :
 814           if (cupsDoAuthentication(http, "POST", resource))
 815           {
 816             DEBUG_puts("1cupsSendRequest: Returning HTTP_AUTHORIZATION_CANCELED.");
 817             return (HTTP_AUTHORIZATION_CANCELED);
 818           }
 819
 820           DEBUG_puts("2cupsSendRequest: Reconnecting after HTTP_UNAUTHORIZED.");
 821
 822           if (httpReconnect(http))
 823           {
 824             DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 825             return (HTTP_SERVICE_UNAVAILABLE);
 826           }
 827           break;
 828
 829 #ifdef HAVE_SSL
 830       case HTTP_UPGRADE_REQUIRED :
 831          /*
 832           * Flush any error message, reconnect, and then upgrade with
 833           * encryption...
 834           */
 835
 836           DEBUG_puts("2cupsSendRequest: Reconnecting after "
 837                      "HTTP_UPGRADE_REQUIRED.");
 838
 839           if (httpReconnect(http))
 840           {
 841             DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 842             return (HTTP_SERVICE_UNAVAILABLE);
 843           }
 844
 845           DEBUG_puts("2cupsSendRequest: Upgrading to TLS.");
 846           if (httpEncryption(http, HTTP_ENCRYPT_REQUIRED))
 847           {
 848             DEBUG_puts("1cupsSendRequest: Unable to encrypt connection.");
 849             return (HTTP_SERVICE_UNAVAILABLE);
 850           }
 851           break;
 852 #endif /* HAVE_SSL */
 853
 854       case HTTP_EXPECTATION_FAILED :
 855          /*
 856           * Don't try using the Expect: header the next time around...
 857           */
 858
 859           expect = (http_status_t)0;
 860
 861           DEBUG_puts("2cupsSendRequest: Reconnecting after "
 862                      "HTTP_EXPECTATION_FAILED.");
 863
 864           if (httpReconnect(http))
 865           {
 866             DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 867             return (HTTP_SERVICE_UNAVAILABLE);
 868           }
 869           break;
 870
 871       default :
 872          /*
 873           * Some other error...
 874           */
 875
 876           return (status);
 877     }
 878   }
 879 }
 880
 881
 882 /*
 883  * 'cupsWriteRequestData()' - Write additional data after an IPP request.
 884  *
 885  * This function is used after @link cupsSendRequest@ to provide a PPD and
 886  * after @link cupsStartDocument@ to provide a document file.
 887  *
 888  * @since CUPS 1.4/Mac OS X 10.6@
 889  */
 890
 891 http_status_t                           /* O - @code HTTP_CONTINUE@ if OK or HTTP status on error */
 892 cupsWriteRequestData(
 893     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 894     const char *buffer,                 /* I - Bytes to write */
 895     size_t     length)                  /* I - Number of bytes to write */
 896 {
 897   int   wused;                          /* Previous bytes in buffer */
 898
 899
 900  /*
 901   * Get the default connection as needed...
 902   */
 903
 904   DEBUG_printf(("cupsWriteRequestData(http=%p, buffer=%p, "
 905                 "length=" CUPS_LLFMT ")", http, buffer, CUPS_LLCAST length));
 906
 907   if (!http)
 908   {
 909     _cups_globals_t *cg = _cupsGlobals();
 910                                         /* Pointer to library globals */
 911
 912     if ((http = cg->http) == NULL)
 913     {
 914       _cupsSetError(IPP_INTERNAL_ERROR, _("No active connection"), 1);
 915       DEBUG_puts("1cupsWriteRequestData: Returning HTTP_ERROR.");
 916       return (HTTP_ERROR);
 917     }
 918   }
 919
 920  /*
 921   * Then write to the HTTP connection...
 922   */
 923
 924   wused = http->wused;
 925
 926   if (httpWrite2(http, buffer, length) < 0)
 927   {
 928     DEBUG_puts("1cupsWriteRequestData: Returning HTTP_ERROR.");
 929     _cupsSetError(IPP_INTERNAL_ERROR, strerror(http->error), 0);
 930     return (HTTP_ERROR);
 931   }
 932
 933  /*
 934   * Finally, check if we have any pending data from the server...
 935   */
 936
 937   if (length >= HTTP_MAX_BUFFER ||
 938       http->wused < wused ||
 939       (wused > 0 && http->wused == length))
 940   {
 941    /*
 942     * We've written something to the server, so check for response data...
 943     */
 944
 945     if (_httpWait(http, 0, 1))
 946     {
 947       http_status_t     status;         /* Status from _httpUpdate */
 948
 949       _httpUpdate(http, &status);
 950       if (status >= HTTP_MULTIPLE_CHOICES)
 951       {
 952         _cupsSetHTTPError(status);
 953
 954         do
 955         {
 956           status = httpUpdate(http);
 957         }
 958         while (status != HTTP_ERROR && http->state == HTTP_POST_RECV);
 959
 960         httpFlush(http);
 961       }
 962
 963       DEBUG_printf(("1cupsWriteRequestData: Returning %d.\n", status));
 964       return (status);
 965     }
 966   }
 967
 968   DEBUG_puts("1cupsWriteRequestData: Returning HTTP_CONTINUE.");
 969   return (HTTP_CONTINUE);
 970 }
 971
 972
 973 /*
 974  * '_cupsConnect()' - Get the default server connection...
 975  */
 976
 977 http_t *                                /* O - HTTP connection */
 978 _cupsConnect(void)
 979 {
 980   _cups_globals_t *cg = _cupsGlobals(); /* Pointer to library globals */
 981
 982
 983  /*
 984   * See if we are connected to the same server...
 985   */
 986
 987   if (cg->http)
 988   {
 989    /*
 990     * Compare the connection hostname, port, and encryption settings to
 991     * the cached defaults; these were initialized the first time we
 992     * connected...
 993     */
 994
 995     if (strcmp(cg->http->hostname, cg->server) ||
 996         cg->ipp_port != _httpAddrPort(cg->http->hostaddr) ||
 997         (cg->http->encryption != cg->encryption &&
 998          cg->http->encryption == HTTP_ENCRYPT_NEVER))
 999     {
1000      /*
1001       * Need to close the current connection because something has changed...
1002       */
1003
1004       httpClose(cg->http);
1005       cg->http = NULL;
1006     }
1007   }
1008
1009  /*
1010   * (Re)connect as needed...
1011   */
1012
1013   if (!cg->http)
1014   {
1015     if ((cg->http = httpConnectEncrypt(cupsServer(), ippPort(),
1016                                        cupsEncryption())) == NULL)
1017     {
1018       if (errno)
1019         _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
1020       else
1021         _cupsSetError(IPP_SERVICE_UNAVAILABLE,
1022                       _("Unable to connect to host."), 1);
1023     }
1024   }
1025
1026  /*
1027   * Return the cached connection...
1028   */
1029
1030   return (cg->http);
1031 }
1032
1033
1034 /*
1035  * '_cupsSetError()' - Set the last IPP status code and status-message.
1036  */
1037
1038 void
1039 _cupsSetError(ipp_status_t status,      /* I - IPP status code */
1040               const char   *message,    /* I - status-message value */
1041               int          localize)    /* I - Localize the message? */
1042 {
1043   _cups_globals_t       *cg;            /* Global data */
1044
1045
1046   if (!message && errno)
1047   {
1048     message  = strerror(errno);
1049     localize = 0;
1050   }
1051
1052   cg             = _cupsGlobals();
1053   cg->last_error = status;
1054
1055   if (cg->last_status_message)
1056   {
1057     _cupsStrFree(cg->last_status_message);
1058
1059     cg->last_status_message = NULL;
1060   }
1061
1062   if (message)
1063   {
1064     if (localize)
1065     {
1066      /*
1067       * Get the message catalog...
1068       */
1069
1070       if (!cg->lang_default)
1071         cg->lang_default = cupsLangDefault();
1072
1073       cg->last_status_message = _cupsStrAlloc(_cupsLangString(cg->lang_default,
1074                                                               message));
1075     }
1076     else
1077       cg->last_status_message = _cupsStrAlloc(message);
1078   }
1079
1080   DEBUG_printf(("4_cupsSetError: last_error=%s, last_status_message=\"%s\"",
1081                 ippErrorString(cg->last_error), cg->last_status_message));
1082 }
1083
1084
1085 /*
1086  * '_cupsSetHTTPError()' - Set the last error using the HTTP status.
1087  */
1088
1089 void
1090 _cupsSetHTTPError(http_status_t status) /* I - HTTP status code */
1091 {
1092   switch (status)
1093   {
1094     case HTTP_NOT_FOUND :
1095         _cupsSetError(IPP_NOT_FOUND, httpStatus(status), 0);
1096         break;
1097
1098     case HTTP_UNAUTHORIZED :
1099         _cupsSetError(IPP_NOT_AUTHENTICATED, httpStatus(status), 0);
1100         break;
1101
1102     case HTTP_AUTHORIZATION_CANCELED :
1103         _cupsSetError(IPP_AUTHENTICATION_CANCELED, httpStatus(status), 0);
1104         break;
1105
1106     case HTTP_FORBIDDEN :
1107         _cupsSetError(IPP_FORBIDDEN, httpStatus(status), 0);
1108         break;
1109
1110     case HTTP_BAD_REQUEST :
1111         _cupsSetError(IPP_BAD_REQUEST, httpStatus(status), 0);
1112         break;
1113
1114     case HTTP_REQUEST_TOO_LARGE :
1115         _cupsSetError(IPP_REQUEST_VALUE, httpStatus(status), 0);
1116         break;
1117
1118     case HTTP_NOT_IMPLEMENTED :
1119         _cupsSetError(IPP_OPERATION_NOT_SUPPORTED, httpStatus(status), 0);
1120         break;
1121
1122     case HTTP_NOT_SUPPORTED :
1123         _cupsSetError(IPP_VERSION_NOT_SUPPORTED, httpStatus(status), 0);
1124         break;
1125
1126     case HTTP_UPGRADE_REQUIRED :
1127         _cupsSetError(IPP_UPGRADE_REQUIRED, httpStatus(status), 0);
1128         break;
1129
1130     case HTTP_PKI_ERROR :
1131         _cupsSetError(IPP_PKI_ERROR, httpStatus(status), 0);
1132         break;
1133
1134     case HTTP_ERROR :
1135         _cupsSetError(IPP_INTERNAL_ERROR, strerror(errno), 0);
1136         break;
1137
1138     default :
1139         DEBUG_printf(("4_cupsSetHTTPError: HTTP error %d mapped to "
1140                       "IPP_SERVICE_UNAVAILABLE!", status));
1141         _cupsSetError(IPP_SERVICE_UNAVAILABLE, httpStatus(status), 0);
1142         break;
1143   }
1144 }
1145
1146
1147 /*
1148  * End of "$Id: request.c 7946 2008-09-16 23:27:54Z mike $".
1149  */