Pileus Git - ~andy/gtk/blob - modules/printbackends/cups/gtkcupsutils.c

   1 /* GTK - The GIMP Toolkit
   2  * gtkcupsutils.h: Statemachine implementation of POST and GET
   3  * cup calls which can be used to create a non-blocking cups API
   4  * Copyright (C) 2003, Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21
  22 #include "gtkcupsutils.h"
  23 #include "config.h"
  24 #include "gtkdebug.h"
  25
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <stdlib.h>
  31 #include <time.h>
  32
  33 #if CUPS_VERSION_MAJOR > 1 || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR > 1) || (CUPS_VERSION_MAJOR == 1 && CUPS_VERSION_MINOR == 1 && CUPS_VERSION_PATCH >= 20)
  34 #define HAVE_HTTP_AUTHSTRING 1
  35 #endif
  36
  37 typedef void (*GtkCupsRequestStateFunc) (GtkCupsRequest *request);
  38
  39 static void _connect            (GtkCupsRequest *request);
  40 static void _post_send          (GtkCupsRequest *request);
  41 static void _post_write_request (GtkCupsRequest *request);
  42 static void _post_write_data    (GtkCupsRequest *request);
  43 static void _post_check         (GtkCupsRequest *request);
  44 static void _post_read_response (GtkCupsRequest *request);
  45
  46 static void _get_send           (GtkCupsRequest *request);
  47 static void _get_check          (GtkCupsRequest *request);
  48 static void _get_read_data      (GtkCupsRequest *request);
  49
  50 struct _GtkCupsResult
  51 {
  52   gchar *error_msg;
  53   ipp_t *ipp_response;
  54
  55   guint is_error : 1;
  56   guint is_ipp_response : 1;
  57 };
  58
  59
  60 #define _GTK_CUPS_MAX_ATTEMPTS 10
  61 #define _GTK_CUPS_MAX_CHUNK_SIZE 8192
  62
  63 static GtkCupsRequestStateFunc post_states[] = {
  64   _connect,
  65   _post_send,
  66   _post_write_request,
  67   _post_write_data,
  68   _post_check,
  69   _post_read_response
  70 };
  71
  72 static GtkCupsRequestStateFunc get_states[] = {
  73   _connect,
  74   _get_send,
  75   _get_check,
  76   _get_read_data
  77 };
  78
  79 static void
  80 gtk_cups_result_set_error (GtkCupsResult *result,
  81                            const char    *error_msg,
  82                            ...)
  83 {
  84   va_list args;
  85
  86   result->is_ipp_response = FALSE;
  87
  88   result->is_error = TRUE;
  89
  90   va_start (args, error_msg);
  91   result->error_msg = g_strdup_vprintf (error_msg, args);
  92   va_end (args);
  93 }
  94
  95 GtkCupsRequest *
  96 gtk_cups_request_new (http_t             *connection,
  97                       GtkCupsRequestType  req_type,
  98                       gint                operation_id,
  99                       GIOChannel         *data_io,
 100                       const char         *server,
 101                       const char         *resource)
 102 {
 103   GtkCupsRequest *request;
 104   cups_lang_t *language;
 105
 106   request = g_new0 (GtkCupsRequest, 1);
 107   request->result = g_new0 (GtkCupsResult, 1);
 108
 109   request->result->error_msg = NULL;
 110   request->result->ipp_response = NULL;
 111
 112   request->result->is_error = FALSE;
 113   request->result->is_ipp_response = FALSE;
 114
 115   request->type = req_type;
 116   request->state = GTK_CUPS_REQUEST_START;
 117
 118    if (server)
 119     request->server = g_strdup (server);
 120   else
 121     request->server = g_strdup (cupsServer());
 122
 123
 124   if (resource)
 125     request->resource = g_strdup (resource);
 126   else
 127     request->resource = g_strdup ("/");
 128
 129   if (connection != NULL)
 130     {
 131       request->http = connection;
 132       request->own_http = FALSE;
 133     }
 134   else
 135     {
 136       request->http = NULL;
 137       request->http = httpConnectEncrypt (request->server, ippPort(), cupsEncryption());
 138
 139       if (request->http)
 140         httpBlocking (request->http, 0);
 141
 142       request->own_http = TRUE;
 143     }
 144
 145   request->last_status = HTTP_CONTINUE;
 146
 147   request->attempts = 0;
 148   request->data_io = data_io;
 149
 150   request->ipp_request = ippNew();
 151   request->ipp_request->request.op.operation_id = operation_id;
 152   request->ipp_request->request.op.request_id = 1;
 153
 154   language = cupsLangDefault ();
 155
 156   gtk_cups_request_ipp_add_string (request, IPP_TAG_OPERATION, IPP_TAG_CHARSET,
 157                                    "attributes-charset",
 158                                    NULL, "utf-8");
 159
 160   gtk_cups_request_ipp_add_string (request, IPP_TAG_OPERATION, IPP_TAG_LANGUAGE,
 161                                    "attributes-natural-language",
 162                                    NULL, language->language);
 163
 164   gtk_cups_request_ipp_add_string (request, IPP_TAG_OPERATION, IPP_TAG_NAME,
 165                                    "requesting-user-name",
 166                                    NULL, cupsUser());
 167
 168   cupsLangFree (language);
 169
 170   return request;
 171 }
 172
 173 static void
 174 gtk_cups_result_free (GtkCupsResult *result)
 175 {
 176   g_free (result->error_msg);
 177
 178   if (result->ipp_response)
 179     ippDelete (result->ipp_response);
 180
 181   g_free (result);
 182 }
 183
 184 void
 185 gtk_cups_request_free (GtkCupsRequest *request)
 186 {
 187   if (request->own_http)
 188     if (request->http)
 189       httpClose (request->http);
 190
 191   if (request->ipp_request)
 192     ippDelete (request->ipp_request);
 193
 194   g_free (request->server);
 195   g_free (request->resource);
 196
 197   gtk_cups_result_free (request->result);
 198
 199   g_free (request);
 200 }
 201
 202 gboolean
 203 gtk_cups_request_read_write (GtkCupsRequest *request)
 204 {
 205   if (request->type == GTK_CUPS_POST)
 206     post_states[request->state](request);
 207   else if (request->type == GTK_CUPS_GET)
 208     get_states[request->state](request);
 209
 210   if (request->attempts > _GTK_CUPS_MAX_ATTEMPTS &&
 211       request->state != GTK_CUPS_REQUEST_DONE)
 212     {
 213       gtk_cups_result_set_error (request->result, "Too many failed attempts");
 214       request->state = GTK_CUPS_REQUEST_DONE;
 215       request->poll_state = GTK_CUPS_HTTP_IDLE;
 216     }
 217
 218   if (request->state == GTK_CUPS_REQUEST_DONE)
 219     {
 220       request->poll_state = GTK_CUPS_HTTP_IDLE;
 221       return TRUE;
 222     }
 223   else
 224     {
 225       return FALSE;
 226     }
 227 }
 228
 229 GtkCupsPollState
 230 gtk_cups_request_get_poll_state (GtkCupsRequest *request)
 231 {
 232   return request->poll_state;
 233 }
 234
 235
 236
 237 GtkCupsResult *
 238 gtk_cups_request_get_result (GtkCupsRequest *request)
 239 {
 240   return request->result;
 241 }
 242
 243 void
 244 gtk_cups_request_ipp_add_string (GtkCupsRequest *request,
 245                                  ipp_tag_t       group,
 246                                  ipp_tag_t       tag,
 247                                  const char     *name,
 248                                  const char     *charset,
 249                                  const char     *value)
 250 {
 251   ippAddString (request->ipp_request,
 252                 group,
 253                 tag,
 254                 name,
 255                 charset,
 256                 value);
 257 }
 258
 259 void
 260 gtk_cups_request_ipp_add_strings (GtkCupsRequest    *request,
 261                                   ipp_tag_t          group,
 262                                   ipp_tag_t          tag,
 263                                   const char        *name,
 264                                   int                num_values,
 265                                   const char        *charset,
 266                                   const char *const *values)
 267 {
 268   ippAddStrings (request->ipp_request,
 269                  group,
 270                  tag,
 271                  name,
 272                  num_values,
 273                  charset,
 274                  values);
 275 }
 276
 277
 278
 279 typedef struct
 280 {
 281   const char    *name;
 282   ipp_tag_t     value_tag;
 283 } ipp_option_t;
 284
 285 static const ipp_option_t ipp_options[] = {
 286   { "blackplot",                IPP_TAG_BOOLEAN },
 287   { "brightness",               IPP_TAG_INTEGER },
 288   { "columns",                  IPP_TAG_INTEGER },
 289   { "copies",                   IPP_TAG_INTEGER },
 290   { "finishings",               IPP_TAG_ENUM },
 291   { "fitplot",                  IPP_TAG_BOOLEAN },
 292   { "gamma",                    IPP_TAG_INTEGER },
 293   { "hue",                      IPP_TAG_INTEGER },
 294   { "job-k-limit",              IPP_TAG_INTEGER },
 295   { "job-page-limit",           IPP_TAG_INTEGER },
 296   { "job-priority",             IPP_TAG_INTEGER },
 297   { "job-quota-period",         IPP_TAG_INTEGER },
 298   { "landscape",                IPP_TAG_BOOLEAN },
 299   { "media",                    IPP_TAG_KEYWORD },
 300   { "mirror",                   IPP_TAG_BOOLEAN },
 301   { "natural-scaling",          IPP_TAG_INTEGER },
 302   { "number-up",                IPP_TAG_INTEGER },
 303   { "orientation-requested",    IPP_TAG_ENUM },
 304   { "page-bottom",              IPP_TAG_INTEGER },
 305   { "page-left",                IPP_TAG_INTEGER },
 306   { "page-ranges",              IPP_TAG_RANGE },
 307   { "page-right",               IPP_TAG_INTEGER },
 308   { "page-top",                 IPP_TAG_INTEGER },
 309   { "penwidth",                 IPP_TAG_INTEGER },
 310   { "ppi",                      IPP_TAG_INTEGER },
 311   { "prettyprint",              IPP_TAG_BOOLEAN },
 312   { "printer-resolution",       IPP_TAG_RESOLUTION },
 313   { "print-quality",            IPP_TAG_ENUM },
 314   { "saturation",               IPP_TAG_INTEGER },
 315   { "scaling",                  IPP_TAG_INTEGER },
 316   { "sides",                    IPP_TAG_KEYWORD },
 317   { "wrap",                     IPP_TAG_BOOLEAN }
 318 };
 319
 320
 321 static ipp_tag_t
 322 _find_option_tag (const gchar *option)
 323 {
 324   int lower_bound, upper_bound, num_options;
 325   int current_option;
 326   ipp_tag_t result;
 327
 328   result = IPP_TAG_ZERO;
 329
 330   lower_bound = 0;
 331   upper_bound = num_options = (int)(sizeof(ipp_options) / sizeof(ipp_options[0])) - 1;
 332
 333   while (1)
 334     {
 335       int match;
 336       current_option = (int) (((upper_bound - lower_bound) / 2) + lower_bound);
 337
 338       match = strcasecmp(option, ipp_options[current_option].name);
 339       if (match == 0)
 340         {
 341           result = ipp_options[current_option].value_tag;
 342           return result;
 343         }
 344       else if (match < 0)
 345         {
 346           upper_bound = current_option - 1;
 347         }
 348       else
 349         {
 350           lower_bound = current_option + 1;
 351         }
 352
 353       if (upper_bound == lower_bound && upper_bound == current_option)
 354         return result;
 355
 356       if (upper_bound < 0)
 357         return result;
 358
 359       if (lower_bound > num_options)
 360         return result;
 361
 362       if (upper_bound < lower_bound)
 363         return result;
 364     }
 365 }
 366
 367 void
 368 gtk_cups_request_encode_option (GtkCupsRequest *request,
 369                                 const gchar    *option,
 370                                 const gchar    *value)
 371 {
 372   ipp_tag_t option_tag;
 373
 374   g_assert (option != NULL);
 375   g_assert (value != NULL);
 376
 377   option_tag = _find_option_tag (option);
 378
 379   if (option_tag == IPP_TAG_ZERO)
 380     {
 381       option_tag = IPP_TAG_NAME;
 382       if (strcasecmp (value, "true") == 0 ||
 383           strcasecmp (value, "false") == 0)
 384         {
 385           option_tag = IPP_TAG_BOOLEAN;
 386         }
 387     }
 388
 389   switch (option_tag)
 390     {
 391       case IPP_TAG_INTEGER:
 392       case IPP_TAG_ENUM:
 393         ippAddInteger (request->ipp_request,
 394                        IPP_TAG_OPERATION,
 395                        option_tag,
 396                        option,
 397                        strtol (value, NULL, 0));
 398         break;
 399
 400       case IPP_TAG_BOOLEAN:
 401         {
 402           char b;
 403           b = 0;
 404           if (!strcasecmp(value, "true") ||
 405               !strcasecmp(value, "on") ||
 406               !strcasecmp(value, "yes"))
 407             b = 1;
 408
 409           ippAddBoolean(request->ipp_request,
 410                         IPP_TAG_OPERATION,
 411                         option,
 412                         b);
 413
 414           break;
 415         }
 416
 417       case IPP_TAG_RANGE:
 418         {
 419           char  *s;
 420           int lower;
 421           int upper;
 422
 423           if (*value == '-')
 424             {
 425               lower = 1;
 426               s = (char *)value;
 427             }
 428           else
 429             lower = strtol(value, &s, 0);
 430
 431           if (*s == '-')
 432             {
 433               if (s[1])
 434                 upper = strtol(s + 1, NULL, 0);
 435               else
 436                 upper = 2147483647;
 437             }
 438           else
 439             upper = lower;
 440
 441           ippAddRange (request->ipp_request,
 442                        IPP_TAG_OPERATION,
 443                        option,
 444                        lower,
 445                        upper);
 446
 447           break;
 448         }
 449
 450       case IPP_TAG_RESOLUTION:
 451         {
 452           char *s;
 453           int xres;
 454           int yres;
 455           ipp_res_t units;
 456
 457           xres = strtol(value, &s, 0);
 458
 459           if (*s == 'x')
 460             yres = strtol(s + 1, &s, 0);
 461           else
 462             yres = xres;
 463
 464           if (strcasecmp(s, "dpc") == 0)
 465             units = IPP_RES_PER_CM;
 466           else
 467             units = IPP_RES_PER_INCH;
 468
 469           ippAddResolution (request->ipp_request,
 470                             IPP_TAG_OPERATION,
 471                             option,
 472                             units,
 473                             xres,
 474                             yres);
 475
 476           break;
 477         }
 478
 479       default:
 480         {
 481           char *values;
 482           char *s;
 483           int in_quotes;
 484           char *next;
 485           GPtrArray *strings;
 486
 487           values = g_strdup (value);
 488           strings = NULL;
 489           in_quotes = 0;
 490
 491           for (s = values, next = s; *s != '\0'; s++)
 492             {
 493               if (in_quotes != 2 && *s == '\'')
 494                 {
 495                   /* skip quoted value */
 496                   if (in_quotes == 0)
 497                     in_quotes = 1;
 498                   else
 499                     in_quotes = 0;
 500                 }
 501               else if (in_quotes != 1 && *s == '\"')
 502                 {
 503                   /* skip quoted value */
 504                   if (in_quotes == 0)
 505                     in_quotes = 2;
 506                   else
 507                     in_quotes = 0;
 508                 }
 509               else if (in_quotes == 0 && *s == ',')
 510                 {
 511                   /* found delimiter, add to value array */
 512                   *s = '\0';
 513                   if (strings == NULL)
 514                     strings = g_ptr_array_new ();
 515                   g_ptr_array_add (strings, next);
 516                   next = s + 1;
 517                 }
 518               else if (in_quotes == 0 && *s == '\\' && s[1] != '\0')
 519                 {
 520                   /* skip escaped character */
 521                   s++;
 522                 }
 523             }
 524
 525           if (strings == NULL)
 526             {
 527               /* single value */
 528               ippAddString (request->ipp_request,
 529                             IPP_TAG_OPERATION,
 530                             option_tag,
 531                             option,
 532                             NULL,
 533                             value);
 534             }
 535           else
 536             {
 537               /* multiple values */
 538
 539               /* add last value */
 540               g_ptr_array_add (strings, next);
 541
 542               ippAddStrings (request->ipp_request,
 543                              IPP_TAG_OPERATION,
 544                              option_tag,
 545                              option,
 546                              strings->len,
 547                              NULL,
 548                              (const char **) strings->pdata);
 549               g_ptr_array_free (strings, TRUE);
 550             }
 551
 552           g_free (values);
 553         }
 554
 555         break;
 556     }
 557 }
 558
 559
 560 static void
 561 _connect (GtkCupsRequest *request)
 562 {
 563   request->poll_state = GTK_CUPS_HTTP_IDLE;
 564
 565   if (request->http == NULL)
 566     {
 567       request->http = httpConnectEncrypt (request->server, ippPort(), cupsEncryption());
 568
 569       if (request->http == NULL)
 570         request->attempts++;
 571
 572       if (request->http)
 573         httpBlocking (request->http, 0);
 574
 575       request->own_http = TRUE;
 576     }
 577   else
 578     {
 579       request->attempts = 0;
 580       request->state++;
 581
 582       /* we always write to the socket after we get
 583          the connection */
 584       request->poll_state = GTK_CUPS_HTTP_WRITE;
 585     }
 586 }
 587
 588 static void
 589 _post_send (GtkCupsRequest *request)
 590 {
 591   gchar length[255];
 592   struct stat data_info;
 593
 594   GTK_NOTE (PRINTING,
 595             g_print ("CUPS Backend: %s\n", G_STRFUNC));
 596
 597   request->poll_state = GTK_CUPS_HTTP_WRITE;
 598
 599   if (request->data_io != NULL)
 600     {
 601       fstat (g_io_channel_unix_get_fd (request->data_io), &data_info);
 602       sprintf (length, "%lu", (unsigned long)ippLength(request->ipp_request) + data_info.st_size);
 603     }
 604   else
 605     {
 606       sprintf (length, "%lu", (unsigned long)ippLength(request->ipp_request));
 607     }
 608
 609   httpClearFields(request->http);
 610   httpSetField(request->http, HTTP_FIELD_CONTENT_LENGTH, length);
 611   httpSetField(request->http, HTTP_FIELD_CONTENT_TYPE, "application/ipp");
 612 #ifdef HAVE_HTTP_AUTHSTRING
 613   httpSetField(request->http, HTTP_FIELD_AUTHORIZATION, request->http->authstring);
 614 #endif
 615
 616   if (httpPost(request->http, request->resource))
 617     {
 618       if (httpReconnect(request->http))
 619         {
 620           request->state = GTK_CUPS_POST_DONE;
 621           request->poll_state = GTK_CUPS_HTTP_IDLE;
 622
 623           gtk_cups_result_set_error (request->result, "Failed Post");
 624         }
 625
 626       request->attempts++;
 627       return;
 628     }
 629
 630     request->attempts = 0;
 631
 632     request->state = GTK_CUPS_POST_WRITE_REQUEST;
 633     request->ipp_request->state = IPP_IDLE;
 634 }
 635
 636 static void
 637 _post_write_request (GtkCupsRequest *request)
 638 {
 639   ipp_state_t ipp_status;
 640
 641   GTK_NOTE (PRINTING,
 642             g_print ("CUPS Backend: %s\n", G_STRFUNC));
 643
 644   request->poll_state = GTK_CUPS_HTTP_WRITE;
 645
 646   ipp_status = ippWrite(request->http, request->ipp_request);
 647
 648   if (ipp_status == IPP_ERROR)
 649     {
 650       request->state = GTK_CUPS_POST_DONE;
 651       request->poll_state = GTK_CUPS_HTTP_IDLE;
 652
 653       gtk_cups_result_set_error (request->result, "%s",ippErrorString (cupsLastError ()));
 654       return;
 655     }
 656
 657   if (ipp_status == IPP_DATA)
 658     {
 659       if (request->data_io != NULL)
 660         request->state = GTK_CUPS_POST_WRITE_DATA;
 661       else
 662         {
 663           request->state = GTK_CUPS_POST_CHECK;
 664           request->poll_state = GTK_CUPS_HTTP_READ;
 665         }
 666     }
 667 }
 668
 669 static void
 670 _post_write_data (GtkCupsRequest *request)
 671 {
 672   gsize bytes;
 673   char buffer[_GTK_CUPS_MAX_CHUNK_SIZE];
 674   http_status_t http_status;
 675
 676   GTK_NOTE (PRINTING,
 677             g_print ("CUPS Backend: %s\n", G_STRFUNC));
 678
 679   request->poll_state = GTK_CUPS_HTTP_WRITE;
 680
 681   if (httpCheck (request->http))
 682     http_status = httpUpdate(request->http);
 683   else
 684     http_status = request->last_status;
 685
 686   request->last_status = http_status;
 687
 688
 689   if (http_status == HTTP_CONTINUE || http_status == HTTP_OK)
 690     {
 691       GIOStatus io_status;
 692       GError *error;
 693
 694       error = NULL;
 695
 696       /* send data */
 697       io_status =
 698         g_io_channel_read_chars (request->data_io,
 699                                  buffer,
 700                                  _GTK_CUPS_MAX_CHUNK_SIZE,
 701                                  &bytes,
 702                                  &error);
 703
 704       if (io_status == G_IO_STATUS_ERROR)
 705         {
 706           request->state = GTK_CUPS_POST_DONE;
 707           request->poll_state = GTK_CUPS_HTTP_IDLE;
 708
 709           gtk_cups_result_set_error (request->result, "Error reading from cache file: %s", error->message);
 710
 711           g_error_free (error);
 712           return;
 713         }
 714       else if (bytes == 0 && io_status == G_IO_STATUS_EOF)
 715         {
 716           request->state = GTK_CUPS_POST_CHECK;
 717           request->poll_state = GTK_CUPS_HTTP_READ;
 718
 719           request->attempts = 0;
 720           return;
 721         }
 722
 723
 724 #if HAVE_CUPS_API_1_2
 725       if (httpWrite2(request->http, buffer, bytes) < bytes)
 726 #else
 727       if (httpWrite(request->http, buffer, (int) bytes) < bytes)
 728 #endif /* HAVE_CUPS_API_1_2 */
 729         {
 730           request->state = GTK_CUPS_POST_DONE;
 731           request->poll_state = GTK_CUPS_HTTP_IDLE;
 732
 733           gtk_cups_result_set_error (request->result, "Error writting to socket in Post %s", strerror (httpError (request->http)));
 734           return;
 735         }
 736     }
 737    else
 738     {
 739       request->attempts++;
 740     }
 741 }
 742
 743 static void
 744 _post_check (GtkCupsRequest *request)
 745 {
 746   http_status_t http_status;
 747
 748   http_status = request->last_status;
 749
 750   GTK_NOTE (PRINTING,
 751             g_print ("CUPS Backend: %s - status %i\n", G_STRFUNC, http_status));
 752
 753   request->poll_state = GTK_CUPS_HTTP_READ;
 754
 755   if (http_status == HTTP_CONTINUE)
 756     {
 757       goto again;
 758     }
 759   else if (http_status == HTTP_UNAUTHORIZED)
 760     {
 761       /* TODO: callout for auth */
 762       g_warning ("NOT IMPLEMENTED: We need to prompt for authorization");
 763       request->state = GTK_CUPS_POST_DONE;
 764       request->poll_state = GTK_CUPS_HTTP_IDLE;
 765
 766       gtk_cups_result_set_error (request->result, "Can't prompt for authorization");
 767       return;
 768     }
 769   else if (http_status == HTTP_ERROR)
 770     {
 771 #ifdef G_OS_WIN32
 772       if (request->http->error != WSAENETDOWN &&
 773           request->http->error != WSAENETUNREACH)
 774 #else
 775       if (request->http->error != ENETDOWN &&
 776           request->http->error != ENETUNREACH)
 777 #endif /* G_OS_WIN32 */
 778         {
 779           request->attempts++;
 780           goto again;
 781         }
 782       else
 783         {
 784           request->state = GTK_CUPS_POST_DONE;
 785           request->poll_state = GTK_CUPS_HTTP_IDLE;
 786
 787           gtk_cups_result_set_error (request->result, "Unknown HTTP error");
 788           return;
 789         }
 790     }
 791 /* TODO: detect ssl in configure.ac */
 792 #if HAVE_SSL
 793   else if (http_status == HTTP_UPGRADE_REQUIRED)
 794     {
 795       /* Flush any error message... */
 796       httpFlush (request->http);
 797
 798       /* Reconnect... */
 799       httpReconnect (request->http);
 800
 801       /* Upgrade with encryption... */
 802       httpEncryption(request->http, HTTP_ENCRYPT_REQUIRED);
 803
 804       request->attempts++;
 805       goto again;
 806     }
 807 #endif
 808   else if (http_status != HTTP_OK)
 809     {
 810       int http_errno;
 811
 812       http_errno = httpError (request->http);
 813
 814       if (http_errno == EPIPE)
 815         request->state = GTK_CUPS_POST_CONNECT;
 816       else
 817         {
 818           request->state = GTK_CUPS_POST_DONE;
 819           gtk_cups_result_set_error (request->result, "HTTP Error in POST %s", strerror (http_errno));
 820          request->poll_state = GTK_CUPS_HTTP_IDLE;
 821
 822           httpFlush(request->http);
 823           return;
 824         }
 825
 826       request->poll_state = GTK_CUPS_HTTP_IDLE;
 827
 828       httpFlush(request->http);
 829
 830       request->last_status = HTTP_CONTINUE;
 831       httpClose (request->http);
 832       request->http = NULL;
 833       return;
 834     }
 835   else
 836     {
 837       request->state = GTK_CUPS_POST_READ_RESPONSE;
 838       return;
 839     }
 840
 841  again:
 842   http_status = HTTP_CONTINUE;
 843
 844   if (httpCheck (request->http))
 845     http_status = httpUpdate (request->http);
 846
 847   request->last_status = http_status;
 848 }
 849
 850 static void
 851 _post_read_response (GtkCupsRequest *request)
 852 {
 853   ipp_state_t ipp_status;
 854
 855   GTK_NOTE (PRINTING,
 856             g_print ("CUPS Backend: %s\n", G_STRFUNC));
 857
 858   request->poll_state = GTK_CUPS_HTTP_READ;
 859
 860   if (request->result->ipp_response == NULL)
 861     request->result->ipp_response = ippNew();
 862
 863   ipp_status = ippRead (request->http,
 864                         request->result->ipp_response);
 865
 866   if (ipp_status == IPP_ERROR)
 867     {
 868       gtk_cups_result_set_error (request->result, "%s", ippErrorString (cupsLastError()));
 869
 870       ippDelete (request->result->ipp_response);
 871       request->result->ipp_response = NULL;
 872
 873       request->state = GTK_CUPS_POST_DONE;
 874       request->poll_state = GTK_CUPS_HTTP_IDLE;
 875     }
 876   else if (ipp_status == IPP_DATA)
 877     {
 878       request->state = GTK_CUPS_POST_DONE;
 879       request->poll_state = GTK_CUPS_HTTP_IDLE;
 880     }
 881 }
 882
 883 static void
 884 _get_send (GtkCupsRequest *request)
 885 {
 886   GTK_NOTE (PRINTING,
 887             g_print ("CUPS Backend: %s\n", G_STRFUNC));
 888
 889   request->poll_state = GTK_CUPS_HTTP_WRITE;
 890
 891   if (request->data_io == NULL)
 892     {
 893       gtk_cups_result_set_error (request->result, "Get requires an open io channel");
 894       request->state = GTK_CUPS_GET_DONE;
 895       request->poll_state = GTK_CUPS_HTTP_IDLE;
 896
 897       return;
 898     }
 899
 900   httpClearFields(request->http);
 901 #ifdef HAVE_HTTP_AUTHSTRING
 902   httpSetField(request->http, HTTP_FIELD_AUTHORIZATION, request->http->authstring);
 903 #endif
 904
 905   if (httpGet(request->http, request->resource))
 906     {
 907       if (httpReconnect(request->http))
 908         {
 909           request->state = GTK_CUPS_GET_DONE;
 910           request->poll_state = GTK_CUPS_HTTP_IDLE;
 911
 912           gtk_cups_result_set_error (request->result, "Failed Get");
 913         }
 914
 915       request->attempts++;
 916       return;
 917     }
 918
 919   request->attempts = 0;
 920
 921   request->state = GTK_CUPS_GET_CHECK;
 922   request->poll_state = GTK_CUPS_HTTP_READ;
 923
 924   request->ipp_request->state = IPP_IDLE;
 925 }
 926
 927 static void
 928 _get_check (GtkCupsRequest *request)
 929 {
 930   http_status_t http_status;
 931
 932   GTK_NOTE (PRINTING,
 933             g_print ("CUPS Backend: %s\n", G_STRFUNC));
 934
 935   http_status = request->last_status;
 936
 937   request->poll_state = GTK_CUPS_HTTP_READ;
 938
 939   if (http_status == HTTP_CONTINUE)
 940     {
 941       goto again;
 942     }
 943   else if (http_status == HTTP_UNAUTHORIZED)
 944     {
 945       /* TODO: callout for auth */
 946       g_warning ("NOT IMPLEMENTED: We need to prompt for authorization in a non blocking manner");
 947       request->state = GTK_CUPS_GET_DONE;
 948       request->poll_state = GTK_CUPS_HTTP_IDLE;
 949
 950       gtk_cups_result_set_error (request->result, "Can't prompt for authorization");
 951       return;
 952     }
 953 /* TODO: detect ssl in configure.ac */
 954 #if HAVE_SSL
 955   else if (http_status == HTTP_UPGRADE_REQUIRED)
 956     {
 957       /* Flush any error message... */
 958       httpFlush (request->http);
 959
 960       /* Reconnect... */
 961       httpReconnect (request->http);
 962
 963       /* Upgrade with encryption... */
 964       httpEncryption(request->http, HTTP_ENCRYPT_REQUIRED);
 965
 966       request->attempts++;
 967       goto again;
 968     }
 969 #endif
 970   else if (http_status != HTTP_OK)
 971     {
 972       int http_errno;
 973
 974       http_errno = httpError (request->http);
 975
 976       if (http_errno == EPIPE)
 977         request->state = GTK_CUPS_GET_CONNECT;
 978       else
 979         {
 980           request->state = GTK_CUPS_GET_DONE;
 981           gtk_cups_result_set_error (request->result, "HTTP Error in GET %s", strerror (http_errno));
 982           request->poll_state = GTK_CUPS_HTTP_IDLE;
 983           httpFlush(request->http);
 984
 985           return;
 986         }
 987
 988       request->poll_state = GTK_CUPS_HTTP_IDLE;
 989       httpFlush (request->http);
 990       httpClose (request->http);
 991       request->last_status = HTTP_CONTINUE;
 992       request->http = NULL;
 993       return;
 994
 995     }
 996   else
 997     {
 998       request->state = GTK_CUPS_GET_READ_DATA;
 999       return;
1000     }
1001
1002  again:
1003   http_status = HTTP_CONTINUE;
1004
1005   if (httpCheck (request->http))
1006     http_status = httpUpdate (request->http);
1007
1008   request->last_status = http_status;
1009
1010 }
1011
1012 static void
1013 _get_read_data (GtkCupsRequest *request)
1014 {
1015   char buffer[_GTK_CUPS_MAX_CHUNK_SIZE];
1016   gsize bytes;
1017   gsize bytes_written;
1018   GIOStatus io_status;
1019   GError *error;
1020
1021   GTK_NOTE (PRINTING,
1022             g_print ("CUPS Backend: %s\n", G_STRFUNC));
1023
1024   error = NULL;
1025
1026   request->poll_state = GTK_CUPS_HTTP_READ;
1027
1028 #if HAVE_CUPS_API_1_2
1029   bytes = httpRead2(request->http, buffer, sizeof(buffer));
1030 #else
1031   bytes = httpRead(request->http, buffer, sizeof(buffer));
1032 #endif /* HAVE_CUPS_API_1_2 */
1033
1034   GTK_NOTE (PRINTING,
1035             g_print ("CUPS Backend: %i bytes read\n", bytes));
1036
1037   if (bytes == 0)
1038     {
1039       request->state = GTK_CUPS_GET_DONE;
1040       request->poll_state = GTK_CUPS_HTTP_IDLE;
1041
1042       return;
1043     }
1044
1045   io_status =
1046     g_io_channel_write_chars (request->data_io,
1047                               buffer,
1048                               bytes,
1049                               &bytes_written,
1050                               &error);
1051
1052   if (io_status == G_IO_STATUS_ERROR)
1053     {
1054       request->state = GTK_CUPS_POST_DONE;
1055       request->poll_state = GTK_CUPS_HTTP_IDLE;
1056
1057       gtk_cups_result_set_error (request->result, error->message);
1058       g_error_free (error);
1059     }
1060 }
1061
1062 gboolean
1063 gtk_cups_request_is_done (GtkCupsRequest *request)
1064 {
1065   return (request->state == GTK_CUPS_REQUEST_DONE);
1066 }
1067
1068 gboolean
1069 gtk_cups_result_is_error (GtkCupsResult *result)
1070 {
1071   return result->is_error;
1072 }
1073
1074 ipp_t *
1075 gtk_cups_result_get_response (GtkCupsResult *result)
1076 {
1077   return result->ipp_response;
1078 }
1079
1080 const char *
1081 gtk_cups_result_get_error_string (GtkCupsResult *result)
1082 {
1083   return result->error_msg;
1084 }
1085