cups/request.c

   1 /*
   2  * "$Id$"
   3  *
   4  * IPP utilities for CUPS.
   5  *
   6  * Copyright 2007-2014 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
  18 /*
  19  * Include necessary headers...
  20  */
  21
  22 #include "cups-private.h"
  23 #include <fcntl.h>
  24 #include <sys/stat.h>
  25 #if defined(WIN32) || defined(__EMX__)
  26 #  include <io.h>
  27 #else
  28 #  include <unistd.h>
  29 #endif /* WIN32 || __EMX__ */
  30 #ifndef O_BINARY
  31 #  define O_BINARY 0
  32 #endif /* O_BINARY */
  33 #ifndef MSG_DONTWAIT
  34 #  define MSG_DONTWAIT 0
  35 #endif /* !MSG_DONTWAIT */
  36
  37
  38 /*
  39  * 'cupsDoFileRequest()' - Do an IPP request with a file.
  40  *
  41  * This function sends the IPP request and attached file to the specified
  42  * server, retrying and authenticating as necessary.  The request is freed with
  43  * @link ippDelete@.
  44  */
  45
  46 ipp_t *                                 /* O - Response data */
  47 cupsDoFileRequest(http_t     *http,     /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
  48                   ipp_t      *request,  /* I - IPP request */
  49                   const char *resource, /* I - HTTP resource for POST */
  50                   const char *filename) /* I - File to send or @code NULL@ for none */
  51 {
  52   ipp_t         *response;              /* IPP response data */
  53   int           infile;                 /* Input file */
  54
  55
  56   DEBUG_printf(("cupsDoFileRequest(http=%p, request=%p(%s), resource=\"%s\", "
  57                 "filename=\"%s\")", http, request,
  58                 request ? ippOpString(request->request.op.operation_id) : "?",
  59                 resource, filename));
  60
  61   if (filename)
  62   {
  63     if ((infile = open(filename, O_RDONLY | O_BINARY)) < 0)
  64     {
  65      /*
  66       * Can't get file information!
  67       */
  68
  69       _cupsSetError(errno == ENOENT ? IPP_STATUS_ERROR_NOT_FOUND : IPP_STATUS_ERROR_NOT_AUTHORIZED,
  70                     NULL, 0);
  71
  72       ippDelete(request);
  73
  74       return (NULL);
  75     }
  76   }
  77   else
  78     infile = -1;
  79
  80   response = cupsDoIORequest(http, request, resource, infile, -1);
  81
  82   if (infile >= 0)
  83     close(infile);
  84
  85   return (response);
  86 }
  87
  88
  89 /*
  90  * 'cupsDoIORequest()' - Do an IPP request with file descriptors.
  91  *
  92  * This function sends the IPP request with the optional input file "infile" to
  93  * the specified server, retrying and authenticating as necessary.  The request
  94  * is freed with @link ippDelete@.
  95  *
  96  * If "infile" is a valid file descriptor, @code cupsDoIORequest@ copies
  97  * all of the data from the file after the IPP request message.
  98  *
  99  * If "outfile" is a valid file descriptor, @code cupsDoIORequest@ copies
 100  * all of the data after the IPP response message to the file.
 101  *
 102  * @since CUPS 1.3/OS X 10.5@
 103  */
 104
 105 ipp_t *                                 /* O - Response data */
 106 cupsDoIORequest(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 107                 ipp_t      *request,    /* I - IPP request */
 108                 const char *resource,   /* I - HTTP resource for POST */
 109                 int        infile,      /* I - File to read from or -1 for none */
 110                 int        outfile)     /* I - File to write to or -1 for none */
 111 {
 112   ipp_t         *response = NULL;       /* IPP response data */
 113   size_t        length = 0;             /* Content-Length value */
 114   http_status_t status;                 /* Status of HTTP request */
 115   struct stat   fileinfo;               /* File information */
 116   ssize_t       bytes;                  /* Number of bytes read/written */
 117   char          buffer[32768];          /* Output buffer */
 118
 119
 120   DEBUG_printf(("cupsDoIORequest(http=%p, request=%p(%s), resource=\"%s\", "
 121                 "infile=%d, outfile=%d)", http, request,
 122                 request ? ippOpString(request->request.op.operation_id) : "?",
 123                 resource, infile, outfile));
 124
 125  /*
 126   * Range check input...
 127   */
 128
 129   if (!request || !resource)
 130   {
 131     ippDelete(request);
 132
 133     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
 134
 135     return (NULL);
 136   }
 137
 138  /*
 139   * Get the default connection as needed...
 140   */
 141
 142   if (!http)
 143     if ((http = _cupsConnect()) == NULL)
 144     {
 145       ippDelete(request);
 146
 147       return (NULL);
 148     }
 149
 150  /*
 151   * See if we have a file to send...
 152   */
 153
 154   if (infile >= 0)
 155   {
 156     if (fstat(infile, &fileinfo))
 157     {
 158      /*
 159       * Can't get file information!
 160       */
 161
 162       _cupsSetError(errno == EBADF ? IPP_STATUS_ERROR_NOT_FOUND : IPP_STATUS_ERROR_NOT_AUTHORIZED,
 163                     NULL, 0);
 164
 165       ippDelete(request);
 166
 167       return (NULL);
 168     }
 169
 170 #ifdef WIN32
 171     if (fileinfo.st_mode & _S_IFDIR)
 172 #else
 173     if (S_ISDIR(fileinfo.st_mode))
 174 #endif /* WIN32 */
 175     {
 176      /*
 177       * Can't send a directory...
 178       */
 179
 180       ippDelete(request);
 181
 182       _cupsSetError(IPP_STATUS_ERROR_NOT_POSSIBLE, strerror(EISDIR), 0);
 183
 184       return (NULL);
 185     }
 186
 187 #ifndef WIN32
 188     if (!S_ISREG(fileinfo.st_mode))
 189       length = 0;                       /* Chunk when piping */
 190     else
 191 #endif /* !WIN32 */
 192     length = ippLength(request) + (size_t)fileinfo.st_size;
 193   }
 194   else
 195     length = ippLength(request);
 196
 197   DEBUG_printf(("2cupsDoIORequest: Request length=%ld, total length=%ld",
 198                 (long)ippLength(request), (long)length));
 199
 200  /*
 201   * Clear any "Local" authentication data since it is probably stale...
 202   */
 203
 204   if (http->authstring && !strncmp(http->authstring, "Local ", 6))
 205     httpSetAuthString(http, NULL, NULL);
 206
 207  /*
 208   * Loop until we can send the request without authorization problems.
 209   */
 210
 211   while (response == NULL)
 212   {
 213     DEBUG_puts("2cupsDoIORequest: setup...");
 214
 215    /*
 216     * Send the request...
 217     */
 218
 219     status = cupsSendRequest(http, request, resource, length);
 220
 221     DEBUG_printf(("2cupsDoIORequest: status=%d", status));
 222
 223     if (status == HTTP_STATUS_CONTINUE && request->state == IPP_STATE_DATA && infile >= 0)
 224     {
 225       DEBUG_puts("2cupsDoIORequest: file write...");
 226
 227      /*
 228       * Send the file with the request...
 229       */
 230
 231 #ifndef WIN32
 232       if (S_ISREG(fileinfo.st_mode))
 233 #endif /* WIN32 */
 234       lseek(infile, 0, SEEK_SET);
 235
 236       while ((bytes = read(infile, buffer, sizeof(buffer))) > 0)
 237       {
 238         if ((status = cupsWriteRequestData(http, buffer, (size_t)bytes))
 239                 != HTTP_STATUS_CONTINUE)
 240           break;
 241       }
 242     }
 243
 244    /*
 245     * Get the server's response...
 246     */
 247
 248     if (status <= HTTP_STATUS_CONTINUE || status == HTTP_STATUS_OK)
 249     {
 250       response = cupsGetResponse(http, resource);
 251       status   = httpGetStatus(http);
 252     }
 253
 254     DEBUG_printf(("2cupsDoIORequest: status=%d", status));
 255
 256     if (status == HTTP_STATUS_ERROR ||
 257         (status >= HTTP_STATUS_BAD_REQUEST && status != HTTP_STATUS_UNAUTHORIZED &&
 258          status != HTTP_STATUS_UPGRADE_REQUIRED))
 259     {
 260       _cupsSetHTTPError(status);
 261       break;
 262     }
 263
 264     if (response && outfile >= 0)
 265     {
 266      /*
 267       * Write trailing data to file...
 268       */
 269
 270       while ((bytes = httpRead2(http, buffer, sizeof(buffer))) > 0)
 271         if (write(outfile, buffer, (size_t)bytes) < bytes)
 272           break;
 273     }
 274
 275     if (http->state != HTTP_STATE_WAITING)
 276     {
 277      /*
 278       * Flush any remaining data...
 279       */
 280
 281       httpFlush(http);
 282     }
 283   }
 284
 285  /*
 286   * Delete the original request and return the response...
 287   */
 288
 289   ippDelete(request);
 290
 291   return (response);
 292 }
 293
 294
 295 /*
 296  * 'cupsDoRequest()' - Do an IPP request.
 297  *
 298  * This function sends the IPP request to the specified server, retrying
 299  * and authenticating as necessary.  The request is freed with @link ippDelete@.
 300  */
 301
 302 ipp_t *                                 /* O - Response data */
 303 cupsDoRequest(http_t     *http,         /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 304               ipp_t      *request,      /* I - IPP request */
 305               const char *resource)     /* I - HTTP resource for POST */
 306 {
 307   DEBUG_printf(("cupsDoRequest(http=%p, request=%p(%s), resource=\"%s\")",
 308                 http, request,
 309                 request ? ippOpString(request->request.op.operation_id) : "?",
 310                 resource));
 311
 312   return (cupsDoIORequest(http, request, resource, -1, -1));
 313 }
 314
 315
 316 /*
 317  * 'cupsGetResponse()' - Get a response to an IPP request.
 318  *
 319  * Use this function to get the response for an IPP request sent using
 320  * @link cupsSendRequest@. For requests that return additional data, use
 321  * @link cupsReadResponseData@ after getting a successful response,
 322  * otherwise call @link httpFlush@ to complete the response processing.
 323  *
 324  * @since CUPS 1.4/OS X 10.6@
 325  */
 326
 327 ipp_t *                                 /* O - Response or @code NULL@ on HTTP error */
 328 cupsGetResponse(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 329                 const char *resource)   /* I - HTTP resource for POST */
 330 {
 331   http_status_t status;                 /* HTTP status */
 332   ipp_state_t   state;                  /* IPP read state */
 333   ipp_t         *response = NULL;       /* IPP response */
 334
 335
 336   DEBUG_printf(("cupsGetResponse(http=%p, resource=\"%s\")", http, resource));
 337   DEBUG_printf(("1cupsGetResponse: http->state=%d", http ? http->state : HTTP_STATE_ERROR));
 338
 339  /*
 340   * Connect to the default server as needed...
 341   */
 342
 343   if (!http)
 344   {
 345     _cups_globals_t *cg = _cupsGlobals();
 346                                         /* Pointer to library globals */
 347
 348     if ((http = cg->http) == NULL)
 349     {
 350       _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No active connection."), 1);
 351       DEBUG_puts("1cupsGetResponse: No active connection - returning NULL.");
 352       return (NULL);
 353     }
 354   }
 355
 356   if (http->state != HTTP_STATE_POST_RECV && http->state != HTTP_STATE_POST_SEND)
 357   {
 358     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No request sent."), 1);
 359     DEBUG_puts("1cupsGetResponse: Not in POST state - returning NULL.");
 360     return (NULL);
 361   }
 362
 363  /*
 364   * Check for an unfinished chunked request...
 365   */
 366
 367   if (http->data_encoding == HTTP_ENCODING_CHUNKED)
 368   {
 369    /*
 370     * Send a 0-length chunk to finish off the request...
 371     */
 372
 373     DEBUG_puts("2cupsGetResponse: Finishing chunked POST...");
 374
 375     if (httpWrite2(http, "", 0) < 0)
 376       return (NULL);
 377   }
 378
 379  /*
 380   * Wait for a response from the server...
 381   */
 382
 383   DEBUG_printf(("2cupsGetResponse: Update loop, http->status=%d...",
 384                 http->status));
 385
 386   do
 387   {
 388     status = httpUpdate(http);
 389   }
 390   while (status == HTTP_STATUS_CONTINUE);
 391
 392   DEBUG_printf(("2cupsGetResponse: status=%d", status));
 393
 394   if (status == HTTP_STATUS_OK)
 395   {
 396    /*
 397     * Get the IPP response...
 398     */
 399
 400     response = ippNew();
 401
 402     while ((state = ippRead(http, response)) != IPP_STATE_DATA)
 403       if (state == IPP_STATE_ERROR)
 404         break;
 405
 406     if (state == IPP_STATE_ERROR)
 407     {
 408      /*
 409       * Flush remaining data and delete the response...
 410       */
 411
 412       DEBUG_puts("1cupsGetResponse: IPP read error!");
 413
 414       httpFlush(http);
 415
 416       ippDelete(response);
 417       response = NULL;
 418
 419       http->status = status = HTTP_STATUS_ERROR;
 420       http->error  = EINVAL;
 421     }
 422   }
 423   else if (status != HTTP_STATUS_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_STATUS_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         httpReconnect2(http, 30000, NULL);
 445       else
 446         http->status = status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 447     }
 448
 449 #ifdef HAVE_SSL
 450     else if (status == HTTP_STATUS_UPGRADE_REQUIRED)
 451     {
 452      /*
 453       * Force a reconnect with encryption...
 454       */
 455
 456       DEBUG_puts("2cupsGetResponse: Need encryption...");
 457
 458       if (!httpReconnect2(http, 30000, NULL))
 459         httpEncryption(http, HTTP_ENCRYPTION_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
 480   return (response);
 481 }
 482
 483
 484 /*
 485  * 'cupsLastError()' - Return the last IPP status code received on the current
 486  *                     thread.
 487  */
 488
 489 ipp_status_t                            /* O - IPP status code from last request */
 490 cupsLastError(void)
 491 {
 492   return (_cupsGlobals()->last_error);
 493 }
 494
 495
 496 /*
 497  * 'cupsLastErrorString()' - Return the last IPP status-message received on the
 498  *                           current thread.
 499  *
 500  * @since CUPS 1.2/OS X 10.5@
 501  */
 502
 503 const char *                            /* O - status-message text from last request */
 504 cupsLastErrorString(void)
 505 {
 506   return (_cupsGlobals()->last_status_message);
 507 }
 508
 509
 510 /*
 511  * '_cupsNextDelay()' - Return the next retry delay value.
 512  *
 513  * This function currently returns the Fibonacci sequence 1 1 2 3 5 8.
 514  *
 515  * Pass 0 for the current delay value to initialize the sequence.
 516  */
 517
 518 int                                     /* O  - Next delay value */
 519 _cupsNextDelay(int current,             /* I  - Current delay value or 0 */
 520                int *previous)           /* IO - Previous delay value */
 521 {
 522   int   next;                           /* Next delay value */
 523
 524
 525   if (current > 0)
 526   {
 527     next      = (current + *previous) % 12;
 528     *previous = next < current ? 0 : current;
 529   }
 530   else
 531   {
 532     next      = 1;
 533     *previous = 0;
 534   }
 535
 536   return (next);
 537 }
 538
 539
 540 /*
 541  * 'cupsReadResponseData()' - Read additional data after the IPP response.
 542  *
 543  * This function is used after @link cupsGetResponse@ to read the PPD or document
 544  * files from @code CUPS_GET_PPD@ and @code CUPS_GET_DOCUMENT@ requests,
 545  * respectively.
 546  *
 547  * @since CUPS 1.4/OS X 10.6@
 548  */
 549
 550 ssize_t                                 /* O - Bytes read, 0 on EOF, -1 on error */
 551 cupsReadResponseData(
 552     http_t *http,                       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 553     char   *buffer,                     /* I - Buffer to use */
 554     size_t length)                      /* I - Number of bytes to read */
 555 {
 556  /*
 557   * Get the default connection as needed...
 558   */
 559
 560   DEBUG_printf(("cupsReadResponseData(http=%p, buffer=%p, "
 561                 "length=" CUPS_LLFMT ")", http, buffer, CUPS_LLCAST length));
 562
 563   if (!http)
 564   {
 565     _cups_globals_t *cg = _cupsGlobals();
 566                                         /* Pointer to library globals */
 567
 568     if ((http = cg->http) == NULL)
 569     {
 570       _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No active connection"), 1);
 571       return (-1);
 572     }
 573   }
 574
 575  /*
 576   * Then read from the HTTP connection...
 577   */
 578
 579   return (httpRead2(http, buffer, length));
 580 }
 581
 582
 583 /*
 584  * 'cupsSendRequest()' - Send an IPP request.
 585  *
 586  * Use @link cupsWriteRequestData@ to write any additional data (document, PPD
 587  * file, etc.) for the request, @link cupsGetResponse@ to get the IPP response,
 588  * and @link cupsReadResponseData@ to read any additional data following the
 589  * response. Only one request can be sent/queued at a time per @code http_t@
 590  * connection.
 591  *
 592  * Returns the initial HTTP status code, which will be @code HTTP_STATUS_CONTINUE@
 593  * on a successful send of the request.
 594  *
 595  * Note: Unlike @link cupsDoFileRequest@, @link cupsDoIORequest@, and
 596  * @link cupsDoRequest@, the request is NOT freed with @link ippDelete@.
 597  *
 598  * @since CUPS 1.4/OS X 10.6@
 599  */
 600
 601 http_status_t                           /* O - Initial HTTP status */
 602 cupsSendRequest(http_t     *http,       /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 603                 ipp_t      *request,    /* I - IPP request */
 604                 const char *resource,   /* I - Resource path */
 605                 size_t     length)      /* I - Length of data to follow or @code CUPS_LENGTH_VARIABLE@ */
 606 {
 607   http_status_t         status;         /* Status of HTTP request */
 608   int                   got_status;     /* Did we get the status? */
 609   ipp_state_t           state;          /* State of IPP processing */
 610   http_status_t         expect;         /* Expect: header to use */
 611
 612
 613   DEBUG_printf(("cupsSendRequest(http=%p, request=%p(%s), resource=\"%s\", "
 614                 "length=" CUPS_LLFMT ")", http, request,
 615                 request ? ippOpString(request->request.op.operation_id) : "?",
 616                 resource, CUPS_LLCAST length));
 617
 618  /*
 619   * Range check input...
 620   */
 621
 622   if (!request || !resource)
 623   {
 624     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
 625
 626     return (HTTP_STATUS_ERROR);
 627   }
 628
 629  /*
 630   * Get the default connection as needed...
 631   */
 632
 633   if (!http)
 634     if ((http = _cupsConnect()) == NULL)
 635       return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 636
 637  /*
 638   * If the prior request was not flushed out, do so now...
 639   */
 640
 641   if (http->state == HTTP_STATE_GET_SEND ||
 642       http->state == HTTP_STATE_POST_SEND)
 643   {
 644     DEBUG_puts("2cupsSendRequest: Flush prior response.");
 645     httpFlush(http);
 646   }
 647   else if (http->state != HTTP_STATE_WAITING)
 648   {
 649     DEBUG_printf(("1cupsSendRequest: Unknown HTTP state (%d), "
 650                   "reconnecting.", http->state));
 651     if (httpReconnect2(http, 30000, NULL))
 652       return (HTTP_STATUS_ERROR);
 653   }
 654
 655 #ifdef HAVE_SSL
 656  /*
 657   * See if we have an auth-info attribute and are communicating over
 658   * a non-local link.  If so, encrypt the link so that we can pass
 659   * the authentication information securely...
 660   */
 661
 662   if (ippFindAttribute(request, "auth-info", IPP_TAG_TEXT) &&
 663       !httpAddrLocalhost(http->hostaddr) && !http->tls &&
 664       httpEncryption(http, HTTP_ENCRYPTION_REQUIRED))
 665   {
 666     DEBUG_puts("1cupsSendRequest: Unable to encrypt connection.");
 667     return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 668   }
 669 #endif /* HAVE_SSL */
 670
 671  /*
 672   * Reconnect if the last response had a "Connection: close"...
 673   */
 674
 675   if (!_cups_strcasecmp(http->fields[HTTP_FIELD_CONNECTION], "close"))
 676   {
 677     DEBUG_puts("2cupsSendRequest: Connection: close");
 678     httpClearFields(http);
 679     if (httpReconnect2(http, 30000, NULL))
 680     {
 681       DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 682       return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 683     }
 684   }
 685
 686  /*
 687   * Loop until we can send the request without authorization problems.
 688   */
 689
 690   expect = HTTP_STATUS_CONTINUE;
 691
 692   for (;;)
 693   {
 694     DEBUG_puts("2cupsSendRequest: Setup...");
 695
 696    /*
 697     * Setup the HTTP variables needed...
 698     */
 699
 700     httpClearFields(http);
 701     httpSetExpect(http, expect);
 702     httpSetField(http, HTTP_FIELD_CONTENT_TYPE, "application/ipp");
 703     httpSetLength(http, length);
 704
 705 #ifdef HAVE_GSSAPI
 706     if (http->authstring && !strncmp(http->authstring, "Negotiate", 9))
 707     {
 708      /*
 709       * Do not use cached Kerberos credentials since they will look like a
 710       * "replay" attack...
 711       */
 712
 713       _cupsSetNegotiateAuthString(http, "POST", resource);
 714     }
 715 #endif /* HAVE_GSSAPI */
 716
 717     httpSetField(http, HTTP_FIELD_AUTHORIZATION, http->authstring);
 718
 719     DEBUG_printf(("2cupsSendRequest: authstring=\"%s\"", http->authstring));
 720
 721    /*
 722     * Try the request...
 723     */
 724
 725     DEBUG_puts("2cupsSendRequest: Sending HTTP POST...");
 726
 727     if (httpPost(http, resource))
 728     {
 729       DEBUG_puts("2cupsSendRequest: POST failed, reconnecting.");
 730       if (httpReconnect2(http, 30000, NULL))
 731       {
 732         DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 733         return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 734       }
 735       else
 736         continue;
 737     }
 738
 739    /*
 740     * Send the IPP data...
 741     */
 742
 743     DEBUG_puts("2cupsSendRequest: Writing IPP request...");
 744
 745     request->state = IPP_STATE_IDLE;
 746     status         = HTTP_STATUS_CONTINUE;
 747     got_status     = 0;
 748
 749     while ((state = ippWrite(http, request)) != IPP_STATE_DATA)
 750       if (state == IPP_STATE_ERROR)
 751         break;
 752       else if (httpCheck(http))
 753       {
 754         got_status = 1;
 755
 756         _httpUpdate(http, &status);
 757         if (status >= HTTP_STATUS_MULTIPLE_CHOICES)
 758           break;
 759       }
 760
 761     if (state == IPP_STATE_ERROR)
 762     {
 763       DEBUG_puts("1cupsSendRequest: Unable to send IPP request.");
 764
 765       http->status = HTTP_STATUS_ERROR;
 766       http->state  = HTTP_STATE_WAITING;
 767
 768       return (HTTP_STATUS_ERROR);
 769     }
 770
 771    /*
 772     * Wait up to 1 second to get the 100-continue response as needed...
 773     */
 774
 775     if (!got_status)
 776     {
 777       if (expect == HTTP_STATUS_CONTINUE)
 778       {
 779         DEBUG_puts("2cupsSendRequest: Waiting for 100-continue...");
 780
 781         if (httpWait(http, 1000))
 782           _httpUpdate(http, &status);
 783       }
 784       else if (httpCheck(http))
 785         _httpUpdate(http, &status);
 786     }
 787
 788     DEBUG_printf(("2cupsSendRequest: status=%d", status));
 789
 790    /*
 791     * Process the current HTTP status...
 792     */
 793
 794     if (status >= HTTP_STATUS_MULTIPLE_CHOICES)
 795     {
 796       int temp_status;                  /* Temporary status */
 797
 798       _cupsSetHTTPError(status);
 799
 800       do
 801       {
 802         temp_status = httpUpdate(http);
 803       }
 804       while (temp_status != HTTP_STATUS_ERROR &&
 805              http->state == HTTP_STATE_POST_RECV);
 806
 807       httpFlush(http);
 808     }
 809
 810     switch (status)
 811     {
 812       case HTTP_STATUS_CONTINUE :
 813       case HTTP_STATUS_OK :
 814       case HTTP_STATUS_ERROR :
 815           DEBUG_printf(("1cupsSendRequest: Returning %d.", status));
 816           return (status);
 817
 818       case HTTP_STATUS_UNAUTHORIZED :
 819           if (cupsDoAuthentication(http, "POST", resource))
 820           {
 821             DEBUG_puts("1cupsSendRequest: Returning HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED.");
 822             return (HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED);
 823           }
 824
 825           DEBUG_puts("2cupsSendRequest: Reconnecting after HTTP_STATUS_UNAUTHORIZED.");
 826
 827           if (httpReconnect2(http, 30000, NULL))
 828           {
 829             DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 830             return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 831           }
 832           break;
 833
 834 #ifdef HAVE_SSL
 835       case HTTP_STATUS_UPGRADE_REQUIRED :
 836          /*
 837           * Flush any error message, reconnect, and then upgrade with
 838           * encryption...
 839           */
 840
 841           DEBUG_puts("2cupsSendRequest: Reconnecting after "
 842                      "HTTP_STATUS_UPGRADE_REQUIRED.");
 843
 844           if (httpReconnect2(http, 30000, NULL))
 845           {
 846             DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 847             return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 848           }
 849
 850           DEBUG_puts("2cupsSendRequest: Upgrading to TLS.");
 851           if (httpEncryption(http, HTTP_ENCRYPTION_REQUIRED))
 852           {
 853             DEBUG_puts("1cupsSendRequest: Unable to encrypt connection.");
 854             return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 855           }
 856           break;
 857 #endif /* HAVE_SSL */
 858
 859       case HTTP_STATUS_EXPECTATION_FAILED :
 860          /*
 861           * Don't try using the Expect: header the next time around...
 862           */
 863
 864           expect = (http_status_t)0;
 865
 866           DEBUG_puts("2cupsSendRequest: Reconnecting after "
 867                      "HTTP_EXPECTATION_FAILED.");
 868
 869           if (httpReconnect2(http, 30000, NULL))
 870           {
 871             DEBUG_puts("1cupsSendRequest: Unable to reconnect.");
 872             return (HTTP_STATUS_SERVICE_UNAVAILABLE);
 873           }
 874           break;
 875
 876       default :
 877          /*
 878           * Some other error...
 879           */
 880
 881           return (status);
 882     }
 883   }
 884 }
 885
 886
 887 /*
 888  * 'cupsWriteRequestData()' - Write additional data after an IPP request.
 889  *
 890  * This function is used after @link cupsSendRequest@ to provide a PPD and
 891  * after @link cupsStartDocument@ to provide a document file.
 892  *
 893  * @since CUPS 1.4/OS X 10.6@
 894  */
 895
 896 http_status_t                           /* O - @code HTTP_STATUS_CONTINUE@ if OK or HTTP status on error */
 897 cupsWriteRequestData(
 898     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 899     const char *buffer,                 /* I - Bytes to write */
 900     size_t     length)                  /* I - Number of bytes to write */
 901 {
 902   int   wused;                          /* Previous bytes in buffer */
 903
 904
 905  /*
 906   * Get the default connection as needed...
 907   */
 908
 909   DEBUG_printf(("cupsWriteRequestData(http=%p, buffer=%p, "
 910                 "length=" CUPS_LLFMT ")", http, buffer, CUPS_LLCAST length));
 911
 912   if (!http)
 913   {
 914     _cups_globals_t *cg = _cupsGlobals();
 915                                         /* Pointer to library globals */
 916
 917     if ((http = cg->http) == NULL)
 918     {
 919       _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("No active connection"), 1);
 920       DEBUG_puts("1cupsWriteRequestData: Returning HTTP_STATUS_ERROR.");
 921       return (HTTP_STATUS_ERROR);
 922     }
 923   }
 924
 925  /*
 926   * Then write to the HTTP connection...
 927   */
 928
 929   wused = http->wused;
 930
 931   if (httpWrite2(http, buffer, length) < 0)
 932   {
 933     DEBUG_puts("1cupsWriteRequestData: Returning HTTP_STATUS_ERROR.");
 934     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(http->error), 0);
 935     return (HTTP_STATUS_ERROR);
 936   }
 937
 938  /*
 939   * Finally, check if we have any pending data from the server...
 940   */
 941
 942   if (length >= HTTP_MAX_BUFFER ||
 943       http->wused < wused ||
 944       (wused > 0 && (size_t)http->wused == length))
 945   {
 946    /*
 947     * We've written something to the server, so check for response data...
 948     */
 949
 950     if (_httpWait(http, 0, 1))
 951     {
 952       http_status_t     status;         /* Status from _httpUpdate */
 953
 954       _httpUpdate(http, &status);
 955       if (status >= HTTP_STATUS_MULTIPLE_CHOICES)
 956       {
 957         _cupsSetHTTPError(status);
 958
 959         do
 960         {
 961           status = httpUpdate(http);
 962         }
 963         while (status != HTTP_STATUS_ERROR && http->state == HTTP_STATE_POST_RECV);
 964
 965         httpFlush(http);
 966       }
 967
 968       DEBUG_printf(("1cupsWriteRequestData: Returning %d.\n", status));
 969       return (status);
 970     }
 971   }
 972
 973   DEBUG_puts("1cupsWriteRequestData: Returning HTTP_STATUS_CONTINUE.");
 974   return (HTTP_STATUS_CONTINUE);
 975 }
 976
 977
 978 /*
 979  * '_cupsConnect()' - Get the default server connection...
 980  */
 981
 982 http_t *                                /* O - HTTP connection */
 983 _cupsConnect(void)
 984 {
 985   _cups_globals_t *cg = _cupsGlobals(); /* Pointer to library globals */
 986
 987
 988  /*
 989   * See if we are connected to the same server...
 990   */
 991
 992   if (cg->http)
 993   {
 994    /*
 995     * Compare the connection hostname, port, and encryption settings to
 996     * the cached defaults; these were initialized the first time we
 997     * connected...
 998     */
 999
1000     if (strcmp(cg->http->hostname, cg->server) ||
1001         cg->ipp_port != httpAddrPort(cg->http->hostaddr) ||
1002         (cg->http->encryption != cg->encryption &&
1003          cg->http->encryption == HTTP_ENCRYPTION_NEVER))
1004     {
1005      /*
1006       * Need to close the current connection because something has changed...
1007       */
1008
1009       httpClose(cg->http);
1010       cg->http = NULL;
1011     }
1012     else
1013     {
1014      /*
1015       * Same server, see if the connection is still established...
1016       */
1017
1018       char      ch;                     /* Connection check byte */
1019       ssize_t   n;                      /* Number of bytes */
1020
1021 #ifdef WIN32
1022       if ((n = recv(cg->http->fd, &ch, 1, MSG_PEEK)) == 0 ||
1023           (n < 0 && WSAGetLastError() != WSAEWOULDBLOCK))
1024 #else
1025       if ((n = recv(cg->http->fd, &ch, 1, MSG_PEEK | MSG_DONTWAIT)) == 0 ||
1026           (n < 0 && 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 = httpConnect2(cupsServer(), ippPort(), NULL, AF_UNSPEC,
1046                                  cupsEncryption(), 1, 30000, NULL)) == NULL)
1047     {
1048       if (errno)
1049         _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, NULL, 0);
1050       else
1051         _cupsSetError(IPP_STATUS_ERROR_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_STATUS_NOT_FOUND :
1125         _cupsSetError(IPP_STATUS_ERROR_NOT_FOUND, httpStatus(status), 0);
1126         break;
1127
1128     case HTTP_STATUS_UNAUTHORIZED :
1129         _cupsSetError(IPP_STATUS_ERROR_NOT_AUTHENTICATED, httpStatus(status), 0);
1130         break;
1131
1132     case HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED :
1133         _cupsSetError(IPP_STATUS_ERROR_CUPS_AUTHENTICATION_CANCELED, httpStatus(status), 0);
1134         break;
1135
1136     case HTTP_STATUS_FORBIDDEN :
1137         _cupsSetError(IPP_STATUS_ERROR_FORBIDDEN, httpStatus(status), 0);
1138         break;
1139
1140     case HTTP_STATUS_BAD_REQUEST :
1141         _cupsSetError(IPP_STATUS_ERROR_BAD_REQUEST, httpStatus(status), 0);
1142         break;
1143
1144     case HTTP_STATUS_REQUEST_TOO_LARGE :
1145         _cupsSetError(IPP_STATUS_ERROR_REQUEST_VALUE, httpStatus(status), 0);
1146         break;
1147
1148     case HTTP_STATUS_NOT_IMPLEMENTED :
1149         _cupsSetError(IPP_STATUS_ERROR_OPERATION_NOT_SUPPORTED, httpStatus(status), 0);
1150         break;
1151
1152     case HTTP_STATUS_NOT_SUPPORTED :
1153         _cupsSetError(IPP_STATUS_ERROR_VERSION_NOT_SUPPORTED, httpStatus(status), 0);
1154         break;
1155
1156     case HTTP_STATUS_UPGRADE_REQUIRED :
1157         _cupsSetError(IPP_STATUS_ERROR_CUPS_UPGRADE_REQUIRED, httpStatus(status), 0);
1158         break;
1159
1160     case HTTP_STATUS_CUPS_PKI_ERROR :
1161         _cupsSetError(IPP_STATUS_ERROR_CUPS_PKI, httpStatus(status), 0);
1162         break;
1163
1164     case HTTP_STATUS_ERROR :
1165         _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
1166         break;
1167
1168     default :
1169         DEBUG_printf(("4_cupsSetHTTPError: HTTP error %d mapped to "
1170                       "IPP_STATUS_ERROR_SERVICE_UNAVAILABLE!", status));
1171         _cupsSetError(IPP_STATUS_ERROR_SERVICE_UNAVAILABLE, httpStatus(status), 0);
1172         break;
1173   }
1174 }
1175
1176
1177 /*
1178  * End of "$Id$".
1179  */