cups/request.c

   1 /*
   2  * "$Id: request.c 7946 2008-09-16 23:27:54Z mike $"
   3  *
   4  *   IPP utilities for the Common UNIX Printing System (CUPS).
   5  *
   6  *   Copyright 2007-2009 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  *   cupsReadResponseData() - Read additional data after the IPP response.
  24  *   cupsSendRequest()      - Send an IPP request.
  25  *   cupsWriteRequestData() - Write additional data after an IPP request.
  26  *   _cupsSetError()        - Set the last IPP status code and status-message.
  27  *   _cupsSetHTTPError()    - Set the last error using the HTTP status.
  28  */
  29
  30 /*
  31  * Include necessary headers...
  32  */
  33
  34 #include "globals.h"
  35 #include "debug.h"
  36 #include <stdlib.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <sys/stat.h>
  40 #if defined(WIN32) || defined(__EMX__)
  41 #  include <io.h>
  42 #else
  43 #  include <unistd.h>
  44 #endif /* WIN32 || __EMX__ */
  45 #ifndef O_BINARY
  46 #  define O_BINARY 0
  47 #endif /* O_BINARY */
  48
  49
  50 /*
  51  * 'cupsDoFileRequest()' - Do an IPP request with a file.
  52  *
  53  * This function sends the IPP request to the specified server, retrying
  54  * and authenticating as necessary.  The request is freed with @link ippDelete@
  55  * after receiving a valid IPP response.
  56  */
  57
  58 ipp_t *                                 /* O - Response data */
  59 cupsDoFileRequest(http_t     *http,     /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
  60                   ipp_t      *request,  /* I - IPP request */
  61                   const char *resource, /* I - HTTP resource for POST */
  62                   const char *filename) /* I - File to send or @code NULL@ for none */
  63 {
  64   ipp_t         *response;              /* IPP response data */
  65   int           infile;                 /* Input file */
  66
  67
  68   DEBUG_printf(("cupsDoFileRequest(http=%p, request=%p(%s), resource=\"%s\", "
  69                 "filename=\"%s\")", http, request,
  70                 request ? ippOpString(request->request.op.operation_id) : "?",
  71                 resource, filename));
  72
  73   if (filename)
  74   {
  75     if ((infile = open(filename, O_RDONLY | O_BINARY)) < 0)
  76     {
  77      /*
  78       * Can't get file information!
  79       */
  80
  81       _cupsSetError(errno == ENOENT ? IPP_NOT_FOUND : IPP_NOT_AUTHORIZED,
  82                     NULL, 0);
  83
  84       ippDelete(request);
  85
  86       return (NULL);
  87     }
  88   }
  89   else
  90     infile = -1;
  91
  92   response = cupsDoIORequest(http, request, resource, infile, -1);
  93
  94   if (infile >= 0)
  95     close(infile);
  96
  97   return (response);
  98 }
  99
 100
 101 /*
 102  * 'cupsDoIORequest()' - Do an IPP request with file descriptors.
 103  *
 104  * This function sends the IPP request to the specified server, retrying
 105  * and authenticating as necessary.  The request is freed with ippDelete()
 106  * after receiving a valid IPP response.
 107  *
 108  * If "infile" is a valid file descriptor, cupsDoIORequest() copies
 109  * all of the data from the file after the IPP request message.
 110  *
 111  * If "outfile" is a valid file descriptor, cupsDoIORequest() copies
 112  * all of the data after the IPP response message to the file.
 113  *
 114  * @since CUPS 1.3/Mac OS X 10.5@
 115  */
 116
 117 ipp_t *                                 /* O - Response data */
 118 cupsDoIORequest(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 119                 ipp_t      *request,    /* I - IPP request */
 120                 const char *resource,   /* I - HTTP resource for POST */
 121                 int        infile,      /* I - File to read from or -1 for none */
 122                 int        outfile)     /* I - File to write to or -1 for none */
 123 {
 124   ipp_t         *response = NULL;       /* IPP response data */
 125   size_t        length = 0;             /* Content-Length value */
 126   http_status_t status;                 /* Status of HTTP request */
 127   struct stat   fileinfo;               /* File information */
 128   int           bytes;                  /* Number of bytes read/written */
 129   char          buffer[32768];          /* Output buffer */
 130
 131
 132   DEBUG_printf(("cupsDoIORequest(http=%p, request=%p(%s), resource=\"%s\", "
 133                 "infile=%d, outfile=%d)", http, request,
 134                 request ? ippOpString(request->request.op.operation_id) : "?",
 135                 resource, infile, outfile));
 136
 137  /*
 138   * Range check input...
 139   */
 140
 141   if (!request || !resource)
 142   {
 143     ippDelete(request);
 144
 145     _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
 146
 147     return (NULL);
 148   }
 149
 150  /*
 151   * Get the default connection as needed...
 152   */
 153
 154   if (!http)
 155     if ((http = _cupsConnect()) == NULL)
 156       return (NULL);
 157
 158  /*
 159   * See if we have a file to send...
 160   */
 161
 162   if (infile >= 0)
 163   {
 164     if (fstat(infile, &fileinfo))
 165     {
 166      /*
 167       * Can't get file information!
 168       */
 169
 170       _cupsSetError(errno == EBADF ? IPP_NOT_FOUND : IPP_NOT_AUTHORIZED,
 171                     NULL, 0);
 172
 173       ippDelete(request);
 174
 175       return (NULL);
 176     }
 177
 178 #ifdef WIN32
 179     if (fileinfo.st_mode & _S_IFDIR)
 180 #else
 181     if (S_ISDIR(fileinfo.st_mode))
 182 #endif /* WIN32 */
 183     {
 184      /*
 185       * Can't send a directory...
 186       */
 187
 188       ippDelete(request);
 189
 190       _cupsSetError(IPP_NOT_POSSIBLE, strerror(EISDIR), 0);
 191
 192       return (NULL);
 193     }
 194
 195 #ifndef WIN32
 196     if (!S_ISREG(fileinfo.st_mode))
 197       length = 0;                       /* Chunk when piping */
 198     else
 199 #endif /* !WIN32 */
 200     length = ippLength(request) + fileinfo.st_size;
 201   }
 202   else
 203     length = ippLength(request);
 204
 205   DEBUG_printf(("2cupsDoIORequest: Request length=%ld, total length=%ld",
 206                 (long)ippLength(request), (long)length));
 207
 208  /*
 209   * Clear any "Local" authentication data since it is probably stale...
 210   */
 211
 212   if (http->authstring && !strncmp(http->authstring, "Local ", 6))
 213     httpSetAuthString(http, NULL, NULL);
 214
 215  /*
 216   * Loop until we can send the request without authorization problems.
 217   */
 218
 219   while (response == NULL)
 220   {
 221     DEBUG_puts("2cupsDoIORequest: setup...");
 222
 223    /*
 224     * Send the request...
 225     */
 226
 227     status = cupsSendRequest(http, request, resource, length);
 228
 229     DEBUG_printf(("2cupsDoIORequest: status=%d", status));
 230
 231     if (status == HTTP_CONTINUE && request->state == IPP_DATA && infile >= 0)
 232     {
 233       DEBUG_puts("2cupsDoIORequest: file write...");
 234
 235      /*
 236       * Send the file with the request...
 237       */
 238
 239 #ifndef WIN32
 240       if (S_ISREG(fileinfo.st_mode))
 241 #endif /* WIN32 */
 242       lseek(infile, 0, SEEK_SET);
 243
 244       while ((bytes = (int)read(infile, buffer, sizeof(buffer))) > 0)
 245       {
 246         if (httpCheck(http))
 247         {
 248           if ((status = httpUpdate(http)) != HTTP_CONTINUE)
 249             break;
 250         }
 251
 252         if (httpWrite2(http, buffer, bytes) < bytes)
 253           break;
 254       }
 255     }
 256
 257    /*
 258     * Get the server's response...
 259     */
 260
 261     if (status == HTTP_CONTINUE || status == HTTP_OK)
 262     {
 263       response = cupsGetResponse(http, resource);
 264       status   = http->status;
 265     }
 266
 267     DEBUG_printf(("2cupsDoIORequest: status=%d", status));
 268
 269     if (status >= HTTP_BAD_REQUEST &&
 270         status != HTTP_UNAUTHORIZED &&
 271         status != HTTP_UPGRADE_REQUIRED)
 272     {
 273       httpFlush(http);
 274       _cupsSetHTTPError(status);
 275       break;
 276     }
 277
 278     if (response)
 279     {
 280       if (outfile >= 0)
 281       {
 282        /*
 283         * Write trailing data to file...
 284         */
 285
 286         while ((bytes = (int)httpRead2(http, buffer, sizeof(buffer))) > 0)
 287           if (write(outfile, buffer, bytes) < bytes)
 288             break;
 289       }
 290       else
 291       {
 292        /*
 293         * Flush any remaining data...
 294         */
 295
 296         httpFlush(http);
 297       }
 298     }
 299   }
 300
 301  /*
 302   * Delete the original request and return the response...
 303   */
 304
 305   ippDelete(request);
 306
 307   return (response);
 308 }
 309
 310
 311 /*
 312  * 'cupsDoRequest()' - Do an IPP request.
 313  *
 314  * This function sends the IPP request to the specified server, retrying
 315  * and authenticating as necessary.  The request is freed with ippDelete()
 316  * after receiving a valid IPP response.
 317  */
 318
 319 ipp_t *                                 /* O - Response data */
 320 cupsDoRequest(http_t     *http,         /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 321               ipp_t      *request,      /* I - IPP request */
 322               const char *resource)     /* I - HTTP resource for POST */
 323 {
 324   DEBUG_printf(("cupsDoRequest(http=%p, request=%p(%s), resource=\"%s\")",
 325                 http, request,
 326                 request ? ippOpString(request->request.op.operation_id) : "?",
 327                 resource));
 328
 329   return (cupsDoIORequest(http, request, resource, -1, -1));
 330 }
 331
 332
 333 /*
 334  * 'cupsGetResponse()' - Get a response to an IPP request.
 335  *
 336  * Use this function to get the response for an IPP request sent using
 337  * cupsSendDocument() or cupsSendRequest(). For requests that return
 338  * additional data, use httpRead() after getting a successful response.
 339  *
 340  * @since CUPS 1.4/Mac OS X 10.6@
 341  */
 342
 343 ipp_t *                                 /* O - Response or @code NULL@ on HTTP error */
 344 cupsGetResponse(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 345                 const char *resource)   /* I - HTTP resource for POST */
 346 {
 347   http_status_t status;                 /* HTTP status */
 348   ipp_state_t   state;                  /* IPP read state */
 349   ipp_t         *response = NULL;       /* IPP response */
 350
 351
 352   DEBUG_printf(("cupsGetResponse(http=%p, resource=\"%s\")", http, resource));
 353
 354  /*
 355   * Connect to the default server as needed...
 356   */
 357
 358   if (!http)
 359     http = _cupsConnect();
 360
 361   if (!http || (http->state != HTTP_POST_RECV && http->state != HTTP_POST_SEND))
 362     return (NULL);
 363
 364  /*
 365   * Check for an unfinished chunked request...
 366   */
 367
 368   if (http->data_encoding == HTTP_ENCODE_CHUNKED)
 369   {
 370    /*
 371     * Send a 0-length chunk to finish off the request...
 372     */
 373
 374     DEBUG_puts("2cupsGetResponse: Finishing chunked POST...");
 375
 376     if (httpWrite2(http, "", 0) < 0)
 377       return (NULL);
 378   }
 379
 380  /*
 381   * Wait for a response from the server...
 382   */
 383
 384   DEBUG_printf(("2cupsGetResponse: Update loop, http->status=%d...",
 385                 http->status));
 386
 387   status = http->status;
 388   while (status == HTTP_CONTINUE)
 389     status = httpUpdate(http);
 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       * Delete the response...
 409       */
 410
 411       DEBUG_puts("1cupsGetResponse: IPP read error!");
 412
 413       ippDelete(response);
 414       response = NULL;
 415
 416       _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 417     }
 418   }
 419   else if (status != HTTP_ERROR)
 420   {
 421    /*
 422     * Flush any error message...
 423     */
 424
 425     httpFlush(http);
 426
 427    /*
 428     * Then handle encryption and authentication...
 429     */
 430
 431     if (status == HTTP_UNAUTHORIZED)
 432     {
 433      /*
 434       * See if we can do authentication...
 435       */
 436
 437       DEBUG_puts("2cupsGetResponse: Need authorization...");
 438
 439       if (!cupsDoAuthentication(http, "POST", resource))
 440         httpReconnect(http);
 441       else
 442         status = HTTP_AUTHORIZATION_CANCELED;
 443     }
 444
 445 #ifdef HAVE_SSL
 446     else if (status == HTTP_UPGRADE_REQUIRED)
 447     {
 448      /*
 449       * Force a reconnect with encryption...
 450       */
 451
 452       DEBUG_puts("2cupsGetResponse: Need encryption...");
 453
 454       if (!httpReconnect(http))
 455         httpEncryption(http, HTTP_ENCRYPT_REQUIRED);
 456     }
 457 #endif /* HAVE_SSL */
 458   }
 459
 460   if (response)
 461   {
 462     ipp_attribute_t     *attr;          /* status-message attribute */
 463
 464
 465     attr = ippFindAttribute(response, "status-message", IPP_TAG_TEXT);
 466
 467     DEBUG_printf(("1cupsGetResponse: status-code=%s, status-message=\"%s\"",
 468                   ippErrorString(response->request.status.status_code),
 469                   attr ? attr->values[0].string.text : ""));
 470
 471     _cupsSetError(response->request.status.status_code,
 472                   attr ? attr->values[0].string.text :
 473                       ippErrorString(response->request.status.status_code), 0);
 474   }
 475   else if (status != HTTP_OK)
 476     _cupsSetHTTPError(status);
 477
 478   return (response);
 479 }
 480
 481
 482 /*
 483  * 'cupsReadResponseData()' - Read additional data after the IPP response.
 484  *
 485  * This function is used after cupsGetResponse() to read the PPD or document
 486  * files for CUPS_GET_PPD and CUPS_GET_DOCUMENT requests, respectively.
 487  *
 488  * @since CUPS 1.4/Mac OS X 10.6@
 489  */
 490
 491 ssize_t                                 /* O - Bytes read, 0 on EOF, -1 on error */
 492 cupsReadResponseData(
 493     http_t *http,                       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 494     char   *buffer,                     /* I - Buffer to use */
 495     size_t length)                      /* I - Number of bytes to read */
 496 {
 497  /*
 498   * Get the default connection as needed...
 499   */
 500
 501   DEBUG_printf(("cupsReadResponseData(http=%p, buffer=%p, "
 502                 "length=" CUPS_LLFMT ")", http, buffer, CUPS_LLCAST length));
 503
 504   if (!http)
 505   {
 506     _cups_globals_t *cg = _cupsGlobals();
 507                                         /* Pointer to library globals */
 508
 509     if ((http = cg->http) == NULL)
 510     {
 511       _cupsSetError(IPP_INTERNAL_ERROR, _("No active connection"), 1);
 512       return (-1);
 513     }
 514   }
 515
 516  /*
 517   * Then read from the HTTP connection...
 518   */
 519
 520   return (httpRead2(http, buffer, length));
 521 }
 522
 523
 524 /*
 525  * 'cupsSendRequest()' - Send an IPP request.
 526  *
 527  * Use httpWrite() to write any additional data (document, PPD file, etc.)
 528  * for the request, cupsGetResponse() to get the IPP response, and httpRead()
 529  * to read any additional data following the response. Only one request can be
 530  * sent/queued at a time.
 531  *
 532  * Unlike cupsDoFileRequest(), cupsDoIORequest(), and cupsDoRequest(), the
 533  * request is not freed.
 534  *
 535  * @since CUPS 1.4/Mac OS X 10.6@
 536  */
 537
 538 http_status_t                           /* O - Initial HTTP status */
 539 cupsSendRequest(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 540                 ipp_t      *request,    /* I - IPP request */
 541                 const char *resource,   /* I - Resource path */
 542                 size_t     length)      /* I - Length of data to follow or @code CUPS_LENGTH_VARIABLE@ */
 543 {
 544   http_status_t status;                 /* Status of HTTP request */
 545   int           got_status;             /* Did we get the status? */
 546   ipp_state_t   state;                  /* State of IPP processing */
 547   http_status_t expect;                 /* Expect: header to use */
 548
 549
 550   DEBUG_printf(("cupsSendRequest(http=%p, request=%p(%s), resource=\"%s\", "
 551                 "length=" CUPS_LLFMT ")", http, request,
 552                 request ? ippOpString(request->request.op.operation_id) : "?",
 553                 resource, CUPS_LLCAST length));
 554
 555  /*
 556   * Range check input...
 557   */
 558
 559   if (!request || !resource)
 560   {
 561     _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
 562
 563     return (HTTP_ERROR);
 564   }
 565
 566  /*
 567   * Get the default connection as needed...
 568   */
 569
 570   if (!http)
 571     if ((http = _cupsConnect()) == NULL)
 572       return (HTTP_SERVICE_UNAVAILABLE);
 573
 574 #ifdef HAVE_SSL
 575  /*
 576   * See if we have an auth-info attribute and are communicating over
 577   * a non-local link.  If so, encrypt the link so that we can pass
 578   * the authentication information securely...
 579   */
 580
 581   if (ippFindAttribute(request, "auth-info", IPP_TAG_TEXT) &&
 582       !httpAddrLocalhost(http->hostaddr) && !http->tls &&
 583       httpEncryption(http, HTTP_ENCRYPT_REQUIRED))
 584   {
 585     _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 586     return (HTTP_SERVICE_UNAVAILABLE);
 587   }
 588 #endif /* HAVE_SSL */
 589
 590  /*
 591   * Reconnect if the last response had a "Connection: close"...
 592   */
 593
 594   if (!strcasecmp(http->fields[HTTP_FIELD_CONNECTION], "close"))
 595     if (httpReconnect(http))
 596     {
 597       _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 598       return (HTTP_SERVICE_UNAVAILABLE);
 599     }
 600
 601  /*
 602   * Loop until we can send the request without authorization problems.
 603   */
 604
 605   expect = HTTP_CONTINUE;
 606
 607   for (;;)
 608   {
 609     DEBUG_puts("2cupsSendRequest: Setup...");
 610
 611    /*
 612     * Setup the HTTP variables needed...
 613     */
 614
 615     httpClearFields(http);
 616     httpSetLength(http, length);
 617     httpSetField(http, HTTP_FIELD_CONTENT_TYPE, "application/ipp");
 618     httpSetField(http, HTTP_FIELD_AUTHORIZATION, http->authstring);
 619     httpSetExpect(http, expect);
 620
 621     DEBUG_printf(("2cupsSendRequest: authstring=\"%s\"", http->authstring));
 622
 623    /*
 624     * Try the request...
 625     */
 626
 627     DEBUG_puts("2cupsSendRequest: Sending HTTP POST...");
 628
 629     if (httpPost(http, resource))
 630     {
 631       if (httpReconnect(http))
 632       {
 633         _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 634         return (HTTP_SERVICE_UNAVAILABLE);
 635       }
 636       else
 637         continue;
 638     }
 639
 640    /*
 641     * Send the IPP data...
 642     */
 643
 644     DEBUG_puts("2cupsSendRequest: Writing IPP request...");
 645
 646     request->state = IPP_IDLE;
 647     status         = HTTP_CONTINUE;
 648     got_status     = 0;
 649
 650     while ((state = ippWrite(http, request)) != IPP_DATA)
 651       if (state == IPP_ERROR)
 652         break;
 653       else if (httpCheck(http))
 654       {
 655         got_status = 1;
 656
 657         if ((status = httpUpdate(http)) != HTTP_CONTINUE)
 658           break;
 659       }
 660
 661    /*
 662     * Wait up to 1 second to get the 100-continue response as needed...
 663     */
 664
 665     if (!got_status && expect == HTTP_CONTINUE)
 666     {
 667       DEBUG_puts("2cupsSendRequest: Waiting for 100-continue...");
 668
 669       if (httpWait(http, 1000))
 670         status = httpUpdate(http);
 671     }
 672     else if (httpCheck(http))
 673       status = httpUpdate(http);
 674
 675     DEBUG_printf(("2cupsSendRequest: status=%d", status));
 676
 677    /*
 678     * Process the current HTTP status...
 679     */
 680
 681     switch (status)
 682     {
 683       case HTTP_ERROR :
 684       case HTTP_CONTINUE :
 685       case HTTP_OK :
 686           return (status);
 687
 688       case HTTP_UNAUTHORIZED :
 689           if (!cupsDoAuthentication(http, "POST", resource))
 690           {
 691             if (httpReconnect(http))
 692             {
 693               _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 694               return (HTTP_SERVICE_UNAVAILABLE);
 695             }
 696           }
 697           else
 698             status = HTTP_AUTHORIZATION_CANCELED;
 699
 700           return (status);
 701
 702 #ifdef HAVE_SSL
 703       case HTTP_UPGRADE_REQUIRED :
 704          /*
 705           * Flush any error message, reconnect, and then upgrade with
 706           * encryption...
 707           */
 708
 709           if (httpReconnect(http))
 710           {
 711             _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 712             return (HTTP_SERVICE_UNAVAILABLE);
 713           }
 714
 715           httpEncryption(http, HTTP_ENCRYPT_REQUIRED);
 716
 717           return (status);
 718 #endif /* HAVE_SSL */
 719
 720       case HTTP_EXPECTATION_FAILED :
 721          /*
 722           * Don't try using the Expect: header the next time around...
 723           */
 724
 725           expect = (http_status_t)0;
 726
 727           if (httpReconnect(http))
 728           {
 729             _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
 730             return (HTTP_SERVICE_UNAVAILABLE);
 731           }
 732           break;
 733
 734       default :
 735          /*
 736           * Some other error...
 737           */
 738
 739           return (status);
 740     }
 741   }
 742 }
 743
 744
 745 /*
 746  * 'cupsWriteRequestData()' - Write additional data after an IPP request.
 747  *
 748  * This function is used after @link cupsSendRequest@ to provide a PPD and
 749  * after @link cupsStartDocument@ to provide a document file.
 750  *
 751  * @since CUPS 1.4/Mac OS X 10.6@
 752  */
 753
 754 http_status_t                           /* O - @code HTTP_CONTINUE@ if OK or HTTP status on error */
 755 cupsWriteRequestData(
 756     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 757     const char *buffer,                 /* I - Bytes to write */
 758     size_t     length)                  /* I - Number of bytes to write */
 759 {
 760   int   wused;                          /* Previous bytes in buffer */
 761
 762
 763  /*
 764   * Get the default connection as needed...
 765   */
 766
 767   DEBUG_printf(("cupsWriteRequestData(http=%p, buffer=%p, "
 768                 "length=" CUPS_LLFMT ")", http, buffer, CUPS_LLCAST length));
 769
 770   if (!http)
 771   {
 772     _cups_globals_t *cg = _cupsGlobals();
 773                                         /* Pointer to library globals */
 774
 775     if ((http = cg->http) == NULL)
 776     {
 777       _cupsSetError(IPP_INTERNAL_ERROR, _("No active connection"), 1);
 778       return (HTTP_ERROR);
 779     }
 780   }
 781
 782  /*
 783   * Then write to the HTTP connection...
 784   */
 785
 786   wused = http->wused;
 787
 788   if (httpWrite2(http, buffer, length) < 0)
 789     return (HTTP_ERROR);
 790
 791  /*
 792   * Finally, check if we have any pending data from the server...
 793   */
 794
 795   if (length >= HTTP_MAX_BUFFER ||
 796       http->wused < wused ||
 797       (wused > 0 && http->wused == length))
 798   {
 799    /*
 800     * We've written something to the server, so check for response data...
 801     */
 802
 803     if (_httpWait(http, 0, 1))
 804       return (httpUpdate(http));
 805   }
 806
 807   return (HTTP_CONTINUE);
 808 }
 809
 810
 811 /*
 812  * '_cupsSetError()' - Set the last IPP status code and status-message.
 813  */
 814
 815 void
 816 _cupsSetError(ipp_status_t status,      /* I - IPP status code */
 817               const char   *message,    /* I - status-message value */
 818               int          localize)    /* I - Localize the message? */
 819 {
 820   _cups_globals_t       *cg;            /* Global data */
 821
 822
 823   if (!message && errno)
 824   {
 825     message  = strerror(errno);
 826     localize = 0;
 827   }
 828
 829   cg             = _cupsGlobals();
 830   cg->last_error = status;
 831
 832   if (cg->last_status_message)
 833   {
 834     _cupsStrFree(cg->last_status_message);
 835
 836     cg->last_status_message = NULL;
 837   }
 838
 839   if (message)
 840   {
 841     if (localize)
 842     {
 843      /*
 844       * Get the message catalog...
 845       */
 846
 847       if (!cg->lang_default)
 848         cg->lang_default = cupsLangDefault();
 849
 850       cg->last_status_message = _cupsStrAlloc(_cupsLangString(cg->lang_default,
 851                                                               message));
 852     }
 853     else
 854       cg->last_status_message = _cupsStrAlloc(message);
 855   }
 856
 857   DEBUG_printf(("4_cupsSetError: last_error=%s, last_status_message=\"%s\"",
 858                 ippErrorString(cg->last_error), cg->last_status_message));
 859 }
 860
 861
 862 /*
 863  * '_cupsSetHTTPError()' - Set the last error using the HTTP status.
 864  */
 865
 866 void
 867 _cupsSetHTTPError(http_status_t status) /* I - HTTP status code */
 868 {
 869   switch (status)
 870   {
 871     case HTTP_NOT_FOUND :
 872         _cupsSetError(IPP_NOT_FOUND, httpStatus(status), 0);
 873         break;
 874
 875     case HTTP_UNAUTHORIZED :
 876     case HTTP_AUTHORIZATION_CANCELED :
 877         _cupsSetError(IPP_NOT_AUTHORIZED, httpStatus(status), 0);
 878         break;
 879
 880     case HTTP_FORBIDDEN :
 881         _cupsSetError(IPP_FORBIDDEN, httpStatus(status), 0);
 882         break;
 883
 884     case HTTP_BAD_REQUEST :
 885         _cupsSetError(IPP_BAD_REQUEST, httpStatus(status), 0);
 886         break;
 887
 888     case HTTP_REQUEST_TOO_LARGE :
 889         _cupsSetError(IPP_REQUEST_VALUE, httpStatus(status), 0);
 890         break;
 891
 892     case HTTP_NOT_IMPLEMENTED :
 893         _cupsSetError(IPP_OPERATION_NOT_SUPPORTED, httpStatus(status), 0);
 894         break;
 895
 896     case HTTP_NOT_SUPPORTED :
 897         _cupsSetError(IPP_VERSION_NOT_SUPPORTED, httpStatus(status), 0);
 898         break;
 899
 900     default :
 901         DEBUG_printf(("4_cupsSetHTTPError: HTTP error %d mapped to "
 902                       "IPP_SERVICE_UNAVAILABLE!", status));
 903         _cupsSetError(IPP_SERVICE_UNAVAILABLE, httpStatus(status), 0);
 904         break;
 905   }
 906 }
 907
 908
 909 /*
 910  * End of "$Id: request.c 7946 2008-09-16 23:27:54Z mike $".
 911  */