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 2007-2013 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 #ifndef MSG_DONTWAIT
  50 #  define MSG_DONTWAIT 0
  51 #endif /* !MSG_DONTWAIT */
  52
  53
  54 /*
  55  * 'cupsDoFileRequest()' - Do an IPP request with a file.
  56  *
  57  * This function sends the IPP request and attached file to the specified
  58  * server, retrying and authenticating as necessary.  The request is freed with
  59  * @link ippDelete@.
  60  */
  61
  62 ipp_t *                                 /* O - Response data */
  63 cupsDoFileRequest(http_t     *http,     /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
  64                   ipp_t      *request,  /* I - IPP request */
  65                   const char *resource, /* I - HTTP resource for POST */
  66                   const char *filename) /* I - File to send or @code NULL@ for none */
  67 {
  68   ipp_t         *response;              /* IPP response data */
  69   int           infile;                 /* Input file */
  70
  71
  72   DEBUG_printf(("cupsDoFileRequest(http=%p, request=%p(%s), resource=\"%s\", "
  73                 "filename=\"%s\")", http, request,
  74                 request ? ippOpString(request->request.op.operation_id) : "?",
  75                 resource, filename));
  76
  77   if (filename)
  78   {
  79     if ((infile = open(filename, O_RDONLY | O_BINARY)) < 0)
  80     {
  81      /*
  82       * Can't get file information!
  83       */
  84
  85       _cupsSetError(errno == ENOENT ? IPP_NOT_FOUND : IPP_NOT_AUTHORIZED,
  86                     NULL, 0);
  87
  88       ippDelete(request);
  89
  90       return (NULL);
  91     }
  92   }
  93   else
  94     infile = -1;
  95
  96   response = cupsDoIORequest(http, request, resource, infile, -1);
  97
  98   if (infile >= 0)
  99     close(infile);
 100
 101   return (response);
 102 }
 103
 104
 105 /*
 106  * 'cupsDoIORequest()' - Do an IPP request with file descriptors.
 107  *
 108  * This function sends the IPP request with the optional input file "infile" to
 109  * the specified server, retrying and authenticating as necessary.  The request
 110  * is freed with @link ippDelete@.
 111  *
 112  * If "infile" is a valid file descriptor, @code cupsDoIORequest@ copies
 113  * all of the data from the file after the IPP request message.
 114  *
 115  * If "outfile" is a valid file descriptor, @code cupsDoIORequest@ copies
 116  * all of the data after the IPP response message to the file.
 117  *
 118  * @since CUPS 1.3/OS X 10.5@
 119  */
 120
 121 ipp_t *                                 /* O - Response data */
 122 cupsDoIORequest(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 123                 ipp_t      *request,    /* I - IPP request */
 124                 const char *resource,   /* I - HTTP resource for POST */
 125                 int        infile,      /* I - File to read from or -1 for none */
 126                 int        outfile)     /* I - File to write to or -1 for none */
 127 {
 128   ipp_t         *response = NULL;       /* IPP response data */
 129   size_t        length = 0;             /* Content-Length value */
 130   http_status_t status;                 /* Status of HTTP request */
 131   struct stat   fileinfo;               /* File information */
 132   int           bytes;                  /* Number of bytes read/written */
 133   char          buffer[32768];          /* Output buffer */
 134
 135
 136   DEBUG_printf(("cupsDoIORequest(http=%p, request=%p(%s), resource=\"%s\", "
 137                 "infile=%d, outfile=%d)", http, request,
 138                 request ? ippOpString(request->request.op.operation_id) : "?",
 139                 resource, infile, outfile));
 140
 141  /*
 142   * Range check input...
 143   */
 144
 145   if (!request || !resource)
 146   {
 147     ippDelete(request);
 148
 149     _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
 150
 151     return (NULL);
 152   }
 153
 154  /*
 155   * Get the default connection as needed...
 156   */
 157
 158   if (!http)
 159     if ((http = _cupsConnect()) == NULL)
 160     {
 161       ippDelete(request);
 162
 163       return (NULL);
 164     }
 165
 166  /*
 167   * See if we have a file to send...
 168   */
 169
 170   if (infile >= 0)
 171   {
 172     if (fstat(infile, &fileinfo))
 173     {
 174      /*
 175       * Can't get file information!
 176       */
 177
 178       _cupsSetError(errno == EBADF ? IPP_NOT_FOUND : IPP_NOT_AUTHORIZED,
 179                     NULL, 0);
 180
 181       ippDelete(request);
 182
 183       return (NULL);
 184     }
 185
 186 #ifdef WIN32
 187     if (fileinfo.st_mode & _S_IFDIR)
 188 #else
 189     if (S_ISDIR(fileinfo.st_mode))
 190 #endif /* WIN32 */
 191     {
 192      /*
 193       * Can't send a directory...
 194       */
 195
 196       ippDelete(request);
 197
 198       _cupsSetError(IPP_NOT_POSSIBLE, strerror(EISDIR), 0);
 199
 200       return (NULL);
 201     }
 202
 203 #ifndef WIN32
 204     if (!S_ISREG(fileinfo.st_mode))
 205       length = 0;                       /* Chunk when piping */
 206     else
 207 #endif /* !WIN32 */
 208     length = ippLength(request) + fileinfo.st_size;
 209   }
 210   else
 211     length = ippLength(request);
 212
 213   DEBUG_printf(("2cupsDoIORequest: Request length=%ld, total length=%ld",
 214                 (long)ippLength(request), (long)length));
 215
 216  /*
 217   * Clear any "Local" authentication data since it is probably stale...
 218   */
 219
 220   if (http->authstring && !strncmp(http->authstring, "Local ", 6))
 221     httpSetAuthString(http, NULL, NULL);
 222
 223  /*
 224   * Loop until we can send the request without authorization problems.
 225   */
 226
 227   while (response == NULL)
 228   {
 229     DEBUG_puts("2cupsDoIORequest: setup...");
 230
 231    /*
 232     * Send the request...
 233     */
 234
 235     status = cupsSendRequest(http, request, resource, length);
 236
 237     DEBUG_printf(("2cupsDoIORequest: status=%d", status));
 238
 239     if (status == HTTP_CONTINUE && request->state == IPP_DATA && infile >= 0)
 240     {
 241       DEBUG_puts("2cupsDoIORequest: file write...");
 242
 243      /*
 244       * Send the file with the request...
 245       */
 246
 247 #ifndef WIN32
 248       if (S_ISREG(fileinfo.st_mode))
 249 #endif /* WIN32 */
 250       lseek(infile, 0, SEEK_SET);
 251
 252       while ((bytes = (int)read(infile, buffer, sizeof(buffer))) > 0)
 253       {
 254         if ((status = cupsWriteRequestData(http, buffer, bytes))
 255                 != HTTP_CONTINUE)
 256           break;
 257       }
 258     }
 259
 260    /*
 261     * Get the server's response...
 262     */
 263
 264     if (status != HTTP_ERROR)
 265     {
 266       response = cupsGetResponse(http, resource);
 267       status   = httpGetStatus(http);
 268     }
 269
 270     DEBUG_printf(("2cupsDoIORequest: status=%d", status));
 271
 272     if (status == HTTP_ERROR ||
 273         (status >= HTTP_BAD_REQUEST && status != HTTP_UNAUTHORIZED &&
 274          status != HTTP_UPGRADE_REQUIRED))
 275     {
 276       _cupsSetHTTPError(status);
 277       break;
 278     }
 279
 280     if (response && 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
 291     if (http->state != HTTP_WAITING)
 292     {
 293      /*
 294       * Flush any remaining data...
 295       */
 296
 297       httpFlush(http);
 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 @link ippDelete@.
 316  */
 317
 318 ipp_t *                                 /* O - Response data */
 319 cupsDoRequest(http_t     *http,         /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 320               ipp_t      *request,      /* I - IPP request */
 321               const char *resource)     /* I - HTTP resource for POST */
 322 {
 323   DEBUG_printf(("cupsDoRequest(http=%p, request=%p(%s), resource=\"%s\")",
 324                 http, request,
 325                 request ? ippOpString(request->request.op.operation_id) : "?",
 326                 resource));
 327
 328   return (cupsDoIORequest(http, request, resource, -1, -1));
 329 }
 330
 331
 332 /*
 333  * 'cupsGetResponse()' - Get a response to an IPP request.
 334  *
 335  * Use this function to get the response for an IPP request sent using
 336  * @link cupsSendRequest@. For requests that return additional data, use
 337  * @link cupsReadResponseData@ after getting a successful response,
 338  * otherwise call @link httpFlush@ to complete the response processing.
 339  *
 340  * @since CUPS 1.4/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   do
 388   {
 389     status = httpUpdate(http);
 390   }
 391   while (status == HTTP_STATUS_CONTINUE);
 392
 393   DEBUG_printf(("2cupsGetResponse: status=%d", status));
 394
 395   if (status == HTTP_OK)
 396   {
 397    /*
 398     * Get the IPP response...
 399     */
 400
 401     response = ippNew();
 402
 403     while ((state = ippRead(http, response)) != IPP_DATA)
 404       if (state == IPP_ERROR)
 405         break;
 406
 407     if (state == IPP_ERROR)
 408     {
 409      /*
 410       * Flush remaining data and delete the response...
 411       */
 412
 413       DEBUG_puts("1cupsGetResponse: IPP read error!");
 414
 415       httpFlush(http);
 416
 417       ippDelete(response);
 418       response = NULL;
 419
 420       http->status = status = HTTP_ERROR;
 421       http->error  = EINVAL;
 422     }
 423   }
 424   else if (status != HTTP_ERROR)
 425   {
 426    /*
 427     * Flush any error message...
 428     */
 429
 430     httpFlush(http);
 431
 432    /*
 433     * Then handle encryption and authentication...
 434     */
 435
 436     if (status == HTTP_UNAUTHORIZED)
 437     {
 438      /*
 439       * See if we can do authentication...
 440       */
 441
 442       DEBUG_puts("2cupsGetResponse: Need authorization...");
 443
 444       if (!cupsDoAuthentication(http, "POST", resource))
 445         httpReconnect(http);
 446       else
 447         http->status = status = HTTP_AUTHORIZATION_CANCELED;
 448     }
 449
 450 #ifdef HAVE_SSL
 451     else if (status == HTTP_UPGRADE_REQUIRED)
 452     {
 453      /*
 454       * Force a reconnect with encryption...
 455       */
 456
 457       DEBUG_puts("2cupsGetResponse: Need encryption...");
 458
 459       if (!httpReconnect(http))
 460         httpEncryption(http, HTTP_ENCRYPT_REQUIRED);
 461     }
 462 #endif /* HAVE_SSL */
 463   }
 464
 465   if (response)
 466   {
 467     ipp_attribute_t     *attr;          /* status-message attribute */
 468
 469
 470     attr = ippFindAttribute(response, "status-message", IPP_TAG_TEXT);
 471
 472     DEBUG_printf(("1cupsGetResponse: status-code=%s, status-message=\"%s\"",
 473                   ippErrorString(response->request.status.status_code),
 474                   attr ? attr->values[0].string.text : ""));
 475
 476     _cupsSetError(response->request.status.status_code,
 477                   attr ? attr->values[0].string.text :
 478                       ippErrorString(response->request.status.status_code), 0);
 479   }
 480
 481   return (response);
 482 }
 483
 484
 485 /*
 486  * 'cupsLastError()' - Return the last IPP status code received on the current
 487  *                     thread.
 488  */
 489
 490 ipp_status_t                            /* O - IPP status code from last request */
 491 cupsLastError(void)
 492 {
 493   return (_cupsGlobals()->last_error);
 494 }
 495
 496
 497 /*
 498  * 'cupsLastErrorString()' - Return the last IPP status-message received on the
 499  *                           current thread.
 500  *
 501  * @since CUPS 1.2/OS X 10.5@
 502  */
 503
 504 const char *                            /* O - status-message text from last request */
 505 cupsLastErrorString(void)
 506 {
 507   return (_cupsGlobals()->last_status_message);
 508 }
 509
 510
 511 /*
 512  * '_cupsNextDelay()' - Return the next retry delay value.
 513  *
 514  * This function currently returns the Fibonacci sequence 1 1 2 3 5 8.
 515  *
 516  * Pass 0 for the current delay value to initialize the sequence.
 517  */
 518
 519 int                                     /* O  - Next delay value */
 520 _cupsNextDelay(int current,             /* I  - Current delay value or 0 */
 521                int *previous)           /* IO - Previous delay value */
 522 {
 523   int   next;                           /* Next delay value */
 524
 525
 526   if (current > 0)
 527   {
 528     next      = (current + *previous) % 12;
 529     *previous = next < current ? 0 : current;
 530   }
 531   else
 532   {
 533     next      = 1;
 534     *previous = 0;
 535   }
 536
 537   return (next);
 538 }
 539
 540
 541 /*
 542  * 'cupsReadResponseData()' - Read additional data after the IPP response.
 543  *
 544  * This function is used after @link cupsGetResponse@ to read the PPD or document
 545  * files from @code CUPS_GET_PPD@ and @code CUPS_GET_DOCUMENT@ requests,
 546  * respectively.
 547  *
 548  * @since CUPS 1.4/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 @link cupsWriteRequestData@ to write any additional data (document, PPD
 588  * file, etc.) for the request, @link cupsGetResponse@ to get the IPP response,
 589  * and @link cupsReadResponseData@ to read any additional data following the
 590  * response. Only one request can be sent/queued at a time per @code http_t@
 591  * connection.
 592  *
 593  * Returns the initial HTTP status code, which will be @code HTTP_CONTINUE@
 594  * on a successful send of the request.
 595  *
 596  * Note: Unlike @link cupsDoFileRequest@, @link cupsDoIORequest@, and
 597  * @link cupsDoRequest@, the request is NOT freed with @link ippDelete@.
 598  *
 599  * @since CUPS 1.4/OS X 10.6@
 600  */
 601
 602 http_status_t                           /* O - Initial HTTP status */
 603 cupsSendRequest(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 604                 ipp_t      *request,    /* I - IPP request */
 605                 const char *resource,   /* I - Resource path */
 606                 size_t     length)      /* I - Length of data to follow or @code CUPS_LENGTH_VARIABLE@ */
 607 {
 608   http_status_t         status;         /* Status of HTTP request */
 609   int                   got_status;     /* Did we get the status? */
 610   ipp_state_t           state;          /* State of IPP processing */
 611   http_status_t         expect;         /* Expect: header to use */
 612
 613
 614   DEBUG_printf(("cupsSendRequest(http=%p, request=%p(%s), resource=\"%s\", "
 615                 "length=" CUPS_LLFMT ")", http, request,
 616                 request ? ippOpString(request->request.op.operation_id) : "?",
 617                 resource, CUPS_LLCAST length));
 618
 619  /*
 620   * Range check input...
 621   */
 622
 623   if (!request || !resource)
 624   {
 625     _cupsSetError(IPP_INTERNAL_ERROR, strerror(EINVAL), 0);
 626
 627     return (HTTP_ERROR);
 628   }
 629
 630  /*
 631   * Get the default connection as needed...
 632   */
 633
 634   if (!http)
 635     if ((http = _cupsConnect()) == NULL)
 636       return (HTTP_SERVICE_UNAVAILABLE);
 637
 638  /*
 639   * If the prior request was not flushed out, do so now...
 640   */
 641
 642   if (http->state == HTTP_GET_SEND ||
 643       http->state == HTTP_POST_SEND)
 644   {
 645     DEBUG_puts("2cupsSendRequest: Flush prior response.");
 646     httpFlush(http);
 647   }
 648   else if (http->state != HTTP_WAITING)
 649   {
 650     DEBUG_printf(("1cupsSendRequest: Unknown HTTP state (%d), "
 651                   "reconnecting.", http->state));
 652     if (httpReconnect(http))
 653       return (HTTP_ERROR);
 654   }
 655
 656 #ifdef HAVE_SSL
 657  /*
 658   * See if we have an auth-info attribute and are communicating over
 659   * a non-local link.  If so, encrypt the link so that we can pass
 660   * the authentication information securely...
 661   */
 662
 663   if (ippFindAttribute(request, "auth-info", IPP_TAG_TEXT) &&
 664       !httpAddrLocalhost(http->hostaddr) && !http->tls &&
 665       httpEncryption(http, HTTP_ENCRYPT_REQUIRED))
 666   {
 667     DEBUG_puts("1cupsSendRequest: Unable to encrypt connection.");
 668     return (HTTP_SERVICE_UNAVAILABLE);
 669   }
 670 #endif /* HAVE_SSL */
 671
 672  /*
 673   * Reconnect if the last response had a "Connection: close"...
 674   */
 675
 676   if (!_cups_strcasecmp(http->fields[HTTP_FIELD_CONNECTION], "close"))
 677   {
 678     DEBUG_puts("2cupsSendRequest: Connection: close");
 679     httpClearFields(http);
 680     if (httpReconnect(http))
 681     {
 682       DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 683       return (HTTP_SERVICE_UNAVAILABLE);
 684     }
 685   }
 686
 687  /*
 688   * Loop until we can send the request without authorization problems.
 689   */
 690
 691   expect = HTTP_CONTINUE;
 692
 693   for (;;)
 694   {
 695     DEBUG_puts("2cupsSendRequest: Setup...");
 696
 697    /*
 698     * Setup the HTTP variables needed...
 699     */
 700
 701     httpClearFields(http);
 702     httpSetExpect(http, expect);
 703     httpSetField(http, HTTP_FIELD_CONTENT_TYPE, "application/ipp");
 704     httpSetLength(http, length);
 705
 706 #ifdef HAVE_GSSAPI
 707     if (http->authstring && !strncmp(http->authstring, "Negotiate", 9))
 708     {
 709      /*
 710       * Do not use cached Kerberos credentials since they will look like a
 711       * "replay" attack...
 712       */
 713
 714       _cupsSetNegotiateAuthString(http, "POST", resource);
 715     }
 716 #endif /* HAVE_GSSAPI */
 717
 718     httpSetField(http, HTTP_FIELD_AUTHORIZATION, http->authstring);
 719
 720     DEBUG_printf(("2cupsSendRequest: authstring=\"%s\"", http->authstring));
 721
 722    /*
 723     * Try the request...
 724     */
 725
 726     DEBUG_puts("2cupsSendRequest: Sending HTTP POST...");
 727
 728     if (httpPost(http, resource))
 729     {
 730       DEBUG_puts("2cupsSendRequest: POST failed, reconnecting.");
 731       if (httpReconnect(http))
 732       {
 733         DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 734         return (HTTP_SERVICE_UNAVAILABLE);
 735       }
 736       else
 737         continue;
 738     }
 739
 740    /*
 741     * Send the IPP data...
 742     */
 743
 744     DEBUG_puts("2cupsSendRequest: Writing IPP request...");
 745
 746     request->state = IPP_IDLE;
 747     status         = HTTP_CONTINUE;
 748     got_status     = 0;
 749
 750     while ((state = ippWrite(http, request)) != IPP_DATA)
 751       if (state == IPP_ERROR)
 752         break;
 753       else if (httpCheck(http))
 754       {
 755         got_status = 1;
 756
 757         _httpUpdate(http, &status);
 758         if (status >= HTTP_MULTIPLE_CHOICES)
 759           break;
 760       }
 761
 762     if (state == IPP_ERROR)
 763     {
 764       DEBUG_puts("1cupsSendRequest: Unable to send IPP request.");
 765
 766       http->status = HTTP_ERROR;
 767       http->state  = HTTP_WAITING;
 768
 769       return (HTTP_ERROR);
 770     }
 771
 772    /*
 773     * Wait up to 1 second to get the 100-continue response as needed...
 774     */
 775
 776     if (!got_status)
 777     {
 778       if (expect == HTTP_CONTINUE)
 779       {
 780         DEBUG_puts("2cupsSendRequest: Waiting for 100-continue...");
 781
 782         if (httpWait(http, 1000))
 783           _httpUpdate(http, &status);
 784       }
 785       else if (httpCheck(http))
 786         _httpUpdate(http, &status);
 787     }
 788
 789     DEBUG_printf(("2cupsSendRequest: status=%d", status));
 790
 791    /*
 792     * Process the current HTTP status...
 793     */
 794
 795     if (status >= HTTP_STATUS_MULTIPLE_CHOICES)
 796     {
 797       int temp_status;                  /* Temporary status */
 798
 799       _cupsSetHTTPError(status);
 800
 801       do
 802       {
 803         temp_status = httpUpdate(http);
 804       }
 805       while (temp_status != HTTP_STATUS_ERROR &&
 806              http->state == HTTP_STATE_POST_RECV);
 807
 808       httpFlush(http);
 809     }
 810
 811     switch (status)
 812     {
 813       case HTTP_STATUS_CONTINUE :
 814       case HTTP_STATUS_OK :
 815       case HTTP_STATUS_ERROR :
 816           DEBUG_printf(("1cupsSendRequest: Returning %d.", status));
 817           return (status);
 818
 819       case HTTP_STATUS_UNAUTHORIZED :
 820           if (cupsDoAuthentication(http, "POST", resource))
 821           {
 822             DEBUG_puts("1cupsSendRequest: Returning HTTP_AUTHORIZATION_CANCELED.");
 823             return (HTTP_AUTHORIZATION_CANCELED);
 824           }
 825
 826           DEBUG_puts("2cupsSendRequest: Reconnecting after HTTP_UNAUTHORIZED.");
 827
 828           if (httpReconnect(http))
 829           {
 830             DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 831             return (HTTP_SERVICE_UNAVAILABLE);
 832           }
 833           break;
 834
 835 #ifdef HAVE_SSL
 836       case HTTP_STATUS_UPGRADE_REQUIRED :
 837          /*
 838           * Flush any error message, reconnect, and then upgrade with
 839           * encryption...
 840           */
 841
 842           DEBUG_puts("2cupsSendRequest: Reconnecting after "
 843                      "HTTP_UPGRADE_REQUIRED.");
 844
 845           if (httpReconnect(http))
 846           {
 847             DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 848             return (HTTP_SERVICE_UNAVAILABLE);
 849           }
 850
 851           DEBUG_puts("2cupsSendRequest: Upgrading to TLS.");
 852           if (httpEncryption(http, HTTP_ENCRYPT_REQUIRED))
 853           {
 854             DEBUG_puts("1cupsSendRequest: Unable to encrypt connection.");
 855             return (HTTP_SERVICE_UNAVAILABLE);
 856           }
 857           break;
 858 #endif /* HAVE_SSL */
 859
 860       case HTTP_STATUS_EXPECTATION_FAILED :
 861          /*
 862           * Don't try using the Expect: header the next time around...
 863           */
 864
 865           expect = (http_status_t)0;
 866
 867           DEBUG_puts("2cupsSendRequest: Reconnecting after "
 868                      "HTTP_EXPECTATION_FAILED.");
 869
 870           if (httpReconnect(http))
 871           {
 872             DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 873             return (HTTP_SERVICE_UNAVAILABLE);
 874           }
 875           break;
 876
 877       default :
 878          /*
 879           * Some other error...
 880           */
 881
 882           return (status);
 883     }
 884   }
 885 }
 886
 887
 888 /*
 889  * 'cupsWriteRequestData()' - Write additional data after an IPP request.
 890  *
 891  * This function is used after @link cupsSendRequest@ to provide a PPD and
 892  * after @link cupsStartDocument@ to provide a document file.
 893  *
 894  * @since CUPS 1.4/OS X 10.6@
 895  */
 896
 897 http_status_t                           /* O - @code HTTP_CONTINUE@ if OK or HTTP status on error */
 898 cupsWriteRequestData(
 899     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 900     const char *buffer,                 /* I - Bytes to write */
 901     size_t     length)                  /* I - Number of bytes to write */
 902 {
 903   int   wused;                          /* Previous bytes in buffer */
 904
 905
 906  /*
 907   * Get the default connection as needed...
 908   */
 909
 910   DEBUG_printf(("cupsWriteRequestData(http=%p, buffer=%p, "
 911                 "length=" CUPS_LLFMT ")", http, buffer, CUPS_LLCAST length));
 912
 913   if (!http)
 914   {
 915     _cups_globals_t *cg = _cupsGlobals();
 916                                         /* Pointer to library globals */
 917
 918     if ((http = cg->http) == NULL)
 919     {
 920       _cupsSetError(IPP_INTERNAL_ERROR, _("No active connection"), 1);
 921       DEBUG_puts("1cupsWriteRequestData: Returning HTTP_ERROR.");
 922       return (HTTP_ERROR);
 923     }
 924   }
 925
 926  /*
 927   * Then write to the HTTP connection...
 928   */
 929
 930   wused = http->wused;
 931
 932   if (httpWrite2(http, buffer, length) < 0)
 933   {
 934     DEBUG_puts("1cupsWriteRequestData: Returning HTTP_ERROR.");
 935     _cupsSetError(IPP_INTERNAL_ERROR, strerror(http->error), 0);
 936     return (HTTP_ERROR);
 937   }
 938
 939  /*
 940   * Finally, check if we have any pending data from the server...
 941   */
 942
 943   if (length >= HTTP_MAX_BUFFER ||
 944       http->wused < wused ||
 945       (wused > 0 && http->wused == length))
 946   {
 947    /*
 948     * We've written something to the server, so check for response data...
 949     */
 950
 951     if (_httpWait(http, 0, 1))
 952     {
 953       http_status_t     status;         /* Status from _httpUpdate */
 954
 955       _httpUpdate(http, &status);
 956       if (status >= HTTP_MULTIPLE_CHOICES)
 957       {
 958         _cupsSetHTTPError(status);
 959
 960         do
 961         {
 962           status = httpUpdate(http);
 963         }
 964         while (status != HTTP_ERROR && http->state == HTTP_POST_RECV);
 965
 966         httpFlush(http);
 967       }
 968
 969       DEBUG_printf(("1cupsWriteRequestData: Returning %d.\n", status));
 970       return (status);
 971     }
 972   }
 973
 974   DEBUG_puts("1cupsWriteRequestData: Returning HTTP_CONTINUE.");
 975   return (HTTP_CONTINUE);
 976 }
 977
 978
 979 /*
 980  * '_cupsConnect()' - Get the default server connection...
 981  */
 982
 983 http_t *                                /* O - HTTP connection */
 984 _cupsConnect(void)
 985 {
 986   _cups_globals_t *cg = _cupsGlobals(); /* Pointer to library globals */
 987
 988
 989  /*
 990   * See if we are connected to the same server...
 991   */
 992
 993   if (cg->http)
 994   {
 995    /*
 996     * Compare the connection hostname, port, and encryption settings to
 997     * the cached defaults; these were initialized the first time we
 998     * connected...
 999     */
1000
1001     if (strcmp(cg->http->hostname, cg->server) ||
1002         cg->ipp_port != httpAddrPort(cg->http->hostaddr) ||
1003         (cg->http->encryption != cg->encryption &&
1004          cg->http->encryption == HTTP_ENCRYPT_NEVER))
1005     {
1006      /*
1007       * Need to close the current connection because something has changed...
1008       */
1009
1010       httpClose(cg->http);
1011       cg->http = NULL;
1012     }
1013     else
1014     {
1015      /*
1016       * Same server, see if the connection is still established...
1017       */
1018
1019       char ch;                          /* Connection check byte */
1020
1021 #ifdef WIN32
1022       if (recv(cg->http->fd, &ch, 1, MSG_PEEK) < 0 &&
1023           WSAGetLastError() != WSAEWOULDBLOCK)
1024 #else
1025       if (recv(cg->http->fd, &ch, 1, MSG_PEEK | MSG_DONTWAIT) < 0 &&
1026           errno != EWOULDBLOCK)
1027 #endif /* WIN32 */
1028       {
1029        /*
1030         * Nope, close the connection...
1031         */
1032
1033         httpClose(cg->http);
1034         cg->http = NULL;
1035       }
1036     }
1037   }
1038
1039  /*
1040   * (Re)connect as needed...
1041   */
1042
1043   if (!cg->http)
1044   {
1045     if ((cg->http = httpConnectEncrypt(cupsServer(), ippPort(),
1046                                        cupsEncryption())) == NULL)
1047     {
1048       if (errno)
1049         _cupsSetError(IPP_SERVICE_UNAVAILABLE, NULL, 0);
1050       else
1051         _cupsSetError(IPP_SERVICE_UNAVAILABLE,
1052                       _("Unable to connect to host."), 1);
1053     }
1054   }
1055
1056  /*
1057   * Return the cached connection...
1058   */
1059
1060   return (cg->http);
1061 }
1062
1063
1064 /*
1065  * '_cupsSetError()' - Set the last IPP status code and status-message.
1066  */
1067
1068 void
1069 _cupsSetError(ipp_status_t status,      /* I - IPP status code */
1070               const char   *message,    /* I - status-message value */
1071               int          localize)    /* I - Localize the message? */
1072 {
1073   _cups_globals_t       *cg;            /* Global data */
1074
1075
1076   if (!message && errno)
1077   {
1078     message  = strerror(errno);
1079     localize = 0;
1080   }
1081
1082   cg             = _cupsGlobals();
1083   cg->last_error = status;
1084
1085   if (cg->last_status_message)
1086   {
1087     _cupsStrFree(cg->last_status_message);
1088
1089     cg->last_status_message = NULL;
1090   }
1091
1092   if (message)
1093   {
1094     if (localize)
1095     {
1096      /*
1097       * Get the message catalog...
1098       */
1099
1100       if (!cg->lang_default)
1101         cg->lang_default = cupsLangDefault();
1102
1103       cg->last_status_message = _cupsStrAlloc(_cupsLangString(cg->lang_default,
1104                                                               message));
1105     }
1106     else
1107       cg->last_status_message = _cupsStrAlloc(message);
1108   }
1109
1110   DEBUG_printf(("4_cupsSetError: last_error=%s, last_status_message=\"%s\"",
1111                 ippErrorString(cg->last_error), cg->last_status_message));
1112 }
1113
1114
1115 /*
1116  * '_cupsSetHTTPError()' - Set the last error using the HTTP status.
1117  */
1118
1119 void
1120 _cupsSetHTTPError(http_status_t status) /* I - HTTP status code */
1121 {
1122   switch (status)
1123   {
1124     case HTTP_NOT_FOUND :
1125         _cupsSetError(IPP_NOT_FOUND, httpStatus(status), 0);
1126         break;
1127
1128     case HTTP_UNAUTHORIZED :
1129         _cupsSetError(IPP_NOT_AUTHENTICATED, httpStatus(status), 0);
1130         break;
1131
1132     case HTTP_AUTHORIZATION_CANCELED :
1133         _cupsSetError(IPP_AUTHENTICATION_CANCELED, httpStatus(status), 0);
1134         break;
1135
1136     case HTTP_FORBIDDEN :
1137         _cupsSetError(IPP_FORBIDDEN, httpStatus(status), 0);
1138         break;
1139
1140     case HTTP_BAD_REQUEST :
1141         _cupsSetError(IPP_BAD_REQUEST, httpStatus(status), 0);
1142         break;
1143
1144     case HTTP_REQUEST_TOO_LARGE :
1145         _cupsSetError(IPP_REQUEST_VALUE, httpStatus(status), 0);
1146         break;
1147
1148     case HTTP_NOT_IMPLEMENTED :
1149         _cupsSetError(IPP_OPERATION_NOT_SUPPORTED, httpStatus(status), 0);
1150         break;
1151
1152     case HTTP_NOT_SUPPORTED :
1153         _cupsSetError(IPP_VERSION_NOT_SUPPORTED, httpStatus(status), 0);
1154         break;
1155
1156     case HTTP_UPGRADE_REQUIRED :
1157         _cupsSetError(IPP_UPGRADE_REQUIRED, httpStatus(status), 0);
1158         break;
1159
1160     case HTTP_PKI_ERROR :
1161         _cupsSetError(IPP_PKI_ERROR, httpStatus(status), 0);
1162         break;
1163
1164     case HTTP_ERROR :
1165         _cupsSetError(IPP_INTERNAL_ERROR, strerror(errno), 0);
1166         break;
1167
1168     default :
1169         DEBUG_printf(("4_cupsSetHTTPError: HTTP error %d mapped to "
1170                       "IPP_SERVICE_UNAVAILABLE!", status));
1171         _cupsSetError(IPP_SERVICE_UNAVAILABLE, httpStatus(status), 0);
1172         break;
1173   }
1174 }
1175
1176
1177 /*
1178  * End of "$Id: request.c 7946 2008-09-16 23:27:54Z mike $".
1179  */