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gtk2/modules/printbackends/cups/gtkcupsutils.c
Matthias Clasen 8ec27f7760 Bug 346903 – gtk_enumerate_printers needs events to complete 
2008-09-17  Matthias Clasen  <mclasen@redhat.com>

        Bug 346903 – gtk_enumerate_printers needs events to complete

        * gtk/gtkprintbackend.h:
        * gtk/gtkprintbackend.c: Add a GtkPrintBackend::status property.

        * modules/printbackends/cups/gtkcupsutils.h:
        * modules/printbackends/cups/gtkcupsutils.c: Turn the connection
        test into a tristate available/unavailable/in progress.

        * modules/printbackends/cups/gtkprintbackendcups.c: Use a single
        connection test instance for getting the default printer and for
        getting the printer list. Set the GtkPrintBackend::status property
        according to the result of the connection test. Use the printer-type
        attribute to find the default printer, if cups supports it.

        * gtk/gtkprinter.c: When enumerating printers, give up when
        the backend status is 'unavailable'.

        * gtk/gtkprintunixdialog.c (printer_status_cb): Select the printer
        when it is the default and nothing else has been selected yet.


svn path=/trunk/; revision=21417
2008-09-17 22:07:10 +00:00

1335 lines
34 KiB
C
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/* GTK - The GIMP Toolkit
* gtkcupsutils.h: Statemachine implementation of POST and GET
* cups calls which can be used to create a non-blocking cups API
* Copyright (C) 2006, 2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "gtkcupsutils.h"
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <time.h>
#include <fcntl.h>
#include <sys/socket.h>
typedef void (*GtkCupsRequestStateFunc) (GtkCupsRequest *request);
static void _connect (GtkCupsRequest *request);
static void _post_send (GtkCupsRequest *request);
static void _post_write_request (GtkCupsRequest *request);
static void _post_write_data (GtkCupsRequest *request);
static void _post_check (GtkCupsRequest *request);
static void _post_read_response (GtkCupsRequest *request);
static void _get_send (GtkCupsRequest *request);
static void _get_check (GtkCupsRequest *request);
static void _get_read_data (GtkCupsRequest *request);
struct _GtkCupsResult
{
gchar *error_msg;
ipp_t *ipp_response;
GtkCupsErrorType error_type;
/* some error types like HTTP_ERROR have a status and a code */
int error_status;
int error_code;
guint is_error : 1;
guint is_ipp_response : 1;
};
#define _GTK_CUPS_MAX_ATTEMPTS 10
#define _GTK_CUPS_MAX_CHUNK_SIZE 8192
static GtkCupsRequestStateFunc post_states[] = {
_connect,
_post_send,
_post_write_request,
_post_write_data,
_post_check,
_post_read_response
};
static GtkCupsRequestStateFunc get_states[] = {
_connect,
_get_send,
_get_check,
_get_read_data
};
static void
gtk_cups_result_set_error (GtkCupsResult *result,
GtkCupsErrorType error_type,
int error_status,
int error_code,
const char *error_msg,
...)
{
va_list args;
result->is_ipp_response = FALSE;
result->is_error = TRUE;
result->error_type = error_type;
result->error_status = error_status;
result->error_code = error_code;
va_start (args, error_msg);
result->error_msg = g_strdup_vprintf (error_msg, args);
va_end (args);
}
GtkCupsRequest *
gtk_cups_request_new (http_t *connection,
GtkCupsRequestType req_type,
gint operation_id,
GIOChannel *data_io,
const char *server,
const char *resource)
{
GtkCupsRequest *request;
cups_lang_t *language;
request = g_new0 (GtkCupsRequest, 1);
request->result = g_new0 (GtkCupsResult, 1);
request->result->error_msg = NULL;
request->result->ipp_response = NULL;
request->result->is_error = FALSE;
request->result->is_ipp_response = FALSE;
request->type = req_type;
request->state = GTK_CUPS_REQUEST_START;
if (server)
request->server = g_strdup (server);
else
request->server = g_strdup (cupsServer ());
if (resource)
request->resource = g_strdup (resource);
else
request->resource = g_strdup ("/");
if (connection != NULL)
{
request->http = connection;
request->own_http = FALSE;
}
else
{
request->http = NULL;
request->http = httpConnectEncrypt (request->server,
ippPort (),
cupsEncryption ());
if (request->http)
httpBlocking (request->http, 0);
request->own_http = TRUE;
}
request->last_status = HTTP_CONTINUE;
request->attempts = 0;
request->data_io = data_io;
request->ipp_request = ippNew ();
request->ipp_request->request.op.operation_id = operation_id;
request->ipp_request->request.op.request_id = 1;
language = cupsLangDefault ();
gtk_cups_request_ipp_add_string (request, IPP_TAG_OPERATION, IPP_TAG_CHARSET,
"attributes-charset",
NULL, "utf-8");
gtk_cups_request_ipp_add_string (request, IPP_TAG_OPERATION, IPP_TAG_LANGUAGE,
"attributes-natural-language",
NULL, language->language);
gtk_cups_request_ipp_add_string (request, IPP_TAG_OPERATION, IPP_TAG_NAME,
"requesting-user-name",
NULL, cupsUser ());
cupsLangFree (language);
return request;
}
static void
gtk_cups_result_free (GtkCupsResult *result)
{
g_free (result->error_msg);
if (result->ipp_response)
ippDelete (result->ipp_response);
g_free (result);
}
void
gtk_cups_request_free (GtkCupsRequest *request)
{
if (request->own_http)
{
if (request->http)
httpClose (request->http);
}
if (request->ipp_request)
ippDelete (request->ipp_request);
g_free (request->server);
g_free (request->resource);
gtk_cups_result_free (request->result);
g_free (request);
}
gboolean
gtk_cups_request_read_write (GtkCupsRequest *request)
{
if (request->type == GTK_CUPS_POST)
post_states[request->state] (request);
else if (request->type == GTK_CUPS_GET)
get_states[request->state] (request);
if (request->attempts > _GTK_CUPS_MAX_ATTEMPTS &&
request->state != GTK_CUPS_REQUEST_DONE)
{
/* TODO: should add a status or error code for too many failed attempts */
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_GENERAL,
0,
0,
"Too many failed attempts");
request->state = GTK_CUPS_REQUEST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
}
if (request->state == GTK_CUPS_REQUEST_DONE)
{
request->poll_state = GTK_CUPS_HTTP_IDLE;
return TRUE;
}
else
return FALSE;
}
GtkCupsPollState
gtk_cups_request_get_poll_state (GtkCupsRequest *request)
{
return request->poll_state;
}
GtkCupsResult *
gtk_cups_request_get_result (GtkCupsRequest *request)
{
return request->result;
}
void
gtk_cups_request_ipp_add_string (GtkCupsRequest *request,
ipp_tag_t group,
ipp_tag_t tag,
const char *name,
const char *charset,
const char *value)
{
ippAddString (request->ipp_request,
group,
tag,
name,
charset,
value);
}
void
gtk_cups_request_ipp_add_strings (GtkCupsRequest *request,
ipp_tag_t group,
ipp_tag_t tag,
const char *name,
int num_values,
const char *charset,
const char *const *values)
{
ippAddStrings (request->ipp_request,
group,
tag,
name,
num_values,
charset,
values);
}
typedef struct
{
const char *name;
ipp_tag_t value_tag;
} ipp_option_t;
static const ipp_option_t ipp_options[] = {
{ "blackplot", IPP_TAG_BOOLEAN },
{ "brightness", IPP_TAG_INTEGER },
{ "columns", IPP_TAG_INTEGER },
{ "copies", IPP_TAG_INTEGER },
{ "finishings", IPP_TAG_ENUM },
{ "fitplot", IPP_TAG_BOOLEAN },
{ "gamma", IPP_TAG_INTEGER },
{ "hue", IPP_TAG_INTEGER },
{ "job-k-limit", IPP_TAG_INTEGER },
{ "job-page-limit", IPP_TAG_INTEGER },
{ "job-priority", IPP_TAG_INTEGER },
{ "job-quota-period", IPP_TAG_INTEGER },
{ "landscape", IPP_TAG_BOOLEAN },
{ "media", IPP_TAG_KEYWORD },
{ "mirror", IPP_TAG_BOOLEAN },
{ "natural-scaling", IPP_TAG_INTEGER },
{ "number-up", IPP_TAG_INTEGER },
{ "orientation-requested", IPP_TAG_ENUM },
{ "page-bottom", IPP_TAG_INTEGER },
{ "page-left", IPP_TAG_INTEGER },
{ "page-ranges", IPP_TAG_RANGE },
{ "page-right", IPP_TAG_INTEGER },
{ "page-top", IPP_TAG_INTEGER },
{ "penwidth", IPP_TAG_INTEGER },
{ "ppi", IPP_TAG_INTEGER },
{ "prettyprint", IPP_TAG_BOOLEAN },
{ "printer-resolution", IPP_TAG_RESOLUTION },
{ "print-quality", IPP_TAG_ENUM },
{ "saturation", IPP_TAG_INTEGER },
{ "scaling", IPP_TAG_INTEGER },
{ "sides", IPP_TAG_KEYWORD },
{ "wrap", IPP_TAG_BOOLEAN }
};
static ipp_tag_t
_find_option_tag (const gchar *option)
{
int lower_bound, upper_bound, num_options;
int current_option;
ipp_tag_t result;
result = IPP_TAG_ZERO;
lower_bound = 0;
upper_bound = num_options = (int) G_N_ELEMENTS (ipp_options) - 1;
while (1)
{
int match;
current_option = (int) (((upper_bound - lower_bound) / 2) + lower_bound);
match = strcasecmp (option, ipp_options[current_option].name);
if (match == 0)
{
result = ipp_options[current_option].value_tag;
return result;
}
else if (match < 0)
{
upper_bound = current_option - 1;
}
else
{
lower_bound = current_option + 1;
}
if (upper_bound == lower_bound && upper_bound == current_option)
return result;
if (upper_bound < 0)
return result;
if (lower_bound > num_options)
return result;
if (upper_bound < lower_bound)
return result;
}
}
/*
* Note that this function uses IPP_TAG_JOB, so it is
* only suitable for IPP Group 2 attributes.
* See RFC 2911.
*/
void
gtk_cups_request_encode_option (GtkCupsRequest *request,
const gchar *option,
const gchar *value)
{
ipp_tag_t option_tag;
g_return_if_fail (option != NULL);
g_return_if_fail (value != NULL);
option_tag = _find_option_tag (option);
if (option_tag == IPP_TAG_ZERO)
{
option_tag = IPP_TAG_NAME;
if (strcasecmp (value, "true") == 0 ||
strcasecmp (value, "false") == 0)
{
option_tag = IPP_TAG_BOOLEAN;
}
}
switch (option_tag)
{
case IPP_TAG_INTEGER:
case IPP_TAG_ENUM:
ippAddInteger (request->ipp_request,
IPP_TAG_JOB,
option_tag,
option,
strtol (value, NULL, 0));
break;
case IPP_TAG_BOOLEAN:
{
char b;
if (strcasecmp (value, "true") == 0 ||
strcasecmp (value, "on") == 0 ||
strcasecmp (value, "yes") == 0)
b = 1;
else
b = 0;
ippAddBoolean (request->ipp_request,
IPP_TAG_JOB,
option,
b);
break;
}
case IPP_TAG_RANGE:
{
char *s;
int lower;
int upper;
if (*value == '-')
{
lower = 1;
s = (char *)value;
}
else
lower = strtol (value, &s, 0);
if (*s == '-')
{
if (s[1])
upper = strtol (s + 1, NULL, 0);
else
upper = 2147483647;
}
else
upper = lower;
ippAddRange (request->ipp_request,
IPP_TAG_JOB,
option,
lower,
upper);
break;
}
case IPP_TAG_RESOLUTION:
{
char *s;
int xres;
int yres;
ipp_res_t units;
xres = strtol (value, &s, 0);
if (*s == 'x')
yres = strtol (s + 1, &s, 0);
else
yres = xres;
if (strcasecmp (s, "dpc") == 0)
units = IPP_RES_PER_CM;
else
units = IPP_RES_PER_INCH;
ippAddResolution (request->ipp_request,
IPP_TAG_JOB,
option,
units,
xres,
yres);
break;
}
default:
{
char *values;
char *s;
int in_quotes;
char *next;
GPtrArray *strings;
values = g_strdup (value);
strings = NULL;
in_quotes = 0;
for (s = values, next = s; *s != '\0'; s++)
{
if (in_quotes != 2 && *s == '\'')
{
/* skip quoted value */
if (in_quotes == 0)
in_quotes = 1;
else
in_quotes = 0;
}
else if (in_quotes != 1 && *s == '\"')
{
/* skip quoted value */
if (in_quotes == 0)
in_quotes = 2;
else
in_quotes = 0;
}
else if (in_quotes == 0 && *s == ',')
{
/* found delimiter, add to value array */
*s = '\0';
if (strings == NULL)
strings = g_ptr_array_new ();
g_ptr_array_add (strings, next);
next = s + 1;
}
else if (in_quotes == 0 && *s == '\\' && s[1] != '\0')
{
/* skip escaped character */
s++;
}
}
if (strings == NULL)
{
/* single value */
ippAddString (request->ipp_request,
IPP_TAG_JOB,
option_tag,
option,
NULL,
value);
}
else
{
/* multiple values */
/* add last value */
g_ptr_array_add (strings, next);
ippAddStrings (request->ipp_request,
IPP_TAG_JOB,
option_tag,
option,
strings->len,
NULL,
(const char **) strings->pdata);
g_ptr_array_free (strings, TRUE);
}
g_free (values);
}
break;
}
}
static void
_connect (GtkCupsRequest *request)
{
request->poll_state = GTK_CUPS_HTTP_IDLE;
if (request->http == NULL)
{
request->http = httpConnectEncrypt (request->server,
ippPort (),
cupsEncryption ());
if (request->http == NULL)
request->attempts++;
if (request->http)
httpBlocking (request->http, 0);
request->own_http = TRUE;
}
else
{
request->attempts = 0;
request->state++;
/* we always write to the socket after we get
the connection */
request->poll_state = GTK_CUPS_HTTP_WRITE;
}
}
static void
_post_send (GtkCupsRequest *request)
{
gchar length[255];
struct stat data_info;
GTK_NOTE (PRINTING,
g_print ("CUPS Backend: %s\n", G_STRFUNC));
request->poll_state = GTK_CUPS_HTTP_WRITE;
if (request->data_io != NULL)
{
fstat (g_io_channel_unix_get_fd (request->data_io), &data_info);
sprintf (length, "%lu", (unsigned long) (ippLength (request->ipp_request) + data_info.st_size));
}
else
sprintf (length, "%lu", (unsigned long) ippLength (request->ipp_request));
httpClearFields (request->http);
httpSetField (request->http, HTTP_FIELD_CONTENT_LENGTH, length);
httpSetField (request->http, HTTP_FIELD_CONTENT_TYPE, "application/ipp");
#ifdef HAVE_HTTPGETAUTHSTRING
httpSetField (request->http, HTTP_FIELD_AUTHORIZATION, httpGetAuthString (request->http));
#else
#ifdef HAVE_HTTP_AUTHSTRING
httpSetField (request->http, HTTP_FIELD_AUTHORIZATION, request->http->authstring);
#endif
#endif
if (httpPost (request->http, request->resource))
{
if (httpReconnect (request->http))
{
request->state = GTK_CUPS_POST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
/* TODO: should add a status or error code for failed post */
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_GENERAL,
0,
0,
"Failed Post");
}
request->attempts++;
return;
}
request->attempts = 0;
request->state = GTK_CUPS_POST_WRITE_REQUEST;
request->ipp_request->state = IPP_IDLE;
}
static void
_post_write_request (GtkCupsRequest *request)
{
ipp_state_t ipp_status;
GTK_NOTE (PRINTING,
g_print ("CUPS Backend: %s\n", G_STRFUNC));
request->poll_state = GTK_CUPS_HTTP_WRITE;
ipp_status = ippWrite (request->http, request->ipp_request);
if (ipp_status == IPP_ERROR)
{
int cups_error = cupsLastError ();
request->state = GTK_CUPS_POST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_IPP,
ipp_status,
cups_error,
"%s",
ippErrorString (cups_error));
return;
}
if (ipp_status == IPP_DATA)
{
if (request->data_io != NULL)
request->state = GTK_CUPS_POST_WRITE_DATA;
else
{
request->state = GTK_CUPS_POST_CHECK;
request->poll_state = GTK_CUPS_HTTP_READ;
}
}
}
static void
_post_write_data (GtkCupsRequest *request)
{
gsize bytes;
char buffer[_GTK_CUPS_MAX_CHUNK_SIZE];
http_status_t http_status;
GTK_NOTE (PRINTING,
g_print ("CUPS Backend: %s\n", G_STRFUNC));
request->poll_state = GTK_CUPS_HTTP_WRITE;
if (httpCheck (request->http))
http_status = httpUpdate (request->http);
else
http_status = request->last_status;
request->last_status = http_status;
if (http_status == HTTP_CONTINUE || http_status == HTTP_OK)
{
GIOStatus io_status;
GError *error;
error = NULL;
/* send data */
io_status =
g_io_channel_read_chars (request->data_io,
buffer,
_GTK_CUPS_MAX_CHUNK_SIZE,
&bytes,
&error);
if (io_status == G_IO_STATUS_ERROR)
{
request->state = GTK_CUPS_POST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_IO,
io_status,
error->code,
"Error reading from cache file: %s",
error->message);
g_error_free (error);
return;
}
else if (bytes == 0 && io_status == G_IO_STATUS_EOF)
{
request->state = GTK_CUPS_POST_CHECK;
request->poll_state = GTK_CUPS_HTTP_READ;
request->attempts = 0;
return;
}
#if HAVE_CUPS_API_1_2
if (httpWrite2 (request->http, buffer, bytes) < bytes)
#else
if (httpWrite (request->http, buffer, (int) bytes) < bytes)
#endif /* HAVE_CUPS_API_1_2 */
{
int http_errno;
http_errno = httpError (request->http);
request->state = GTK_CUPS_POST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_HTTP,
http_status,
http_errno,
"Error writing to socket in Post %s",
g_strerror (http_errno));
return;
}
}
else
{
request->attempts++;
}
}
static void
_post_check (GtkCupsRequest *request)
{
http_status_t http_status;
http_status = request->last_status;
GTK_NOTE (PRINTING,
g_print ("CUPS Backend: %s - status %i\n", G_STRFUNC, http_status));
request->poll_state = GTK_CUPS_HTTP_READ;
if (http_status == HTTP_CONTINUE)
{
goto again;
}
else if (http_status == HTTP_UNAUTHORIZED)
{
/* TODO: callout for auth */
g_warning ("NOT IMPLEMENTED: We need to prompt for authorization");
request->state = GTK_CUPS_POST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
/* TODO: create a not implemented error code */
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_GENERAL,
0,
0,
"Can't prompt for authorization");
return;
}
else if (http_status == HTTP_ERROR)
{
int error = httpError (request->http);
#ifdef G_OS_WIN32
if (error != WSAENETDOWN && error != WSAENETUNREACH)
#else
if (error != ENETDOWN && error != ENETUNREACH)
#endif /* G_OS_WIN32 */
{
request->attempts++;
goto again;
}
else
{
request->state = GTK_CUPS_POST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_HTTP,
http_status,
error,
"Unknown HTTP error");
return;
}
}
else if (http_status == HTTP_UPGRADE_REQUIRED)
{
/* Flush any error message... */
httpFlush (request->http);
cupsSetEncryption (HTTP_ENCRYPT_REQUIRED);
request->state = GTK_CUPS_POST_CONNECT;
/* Reconnect... */
httpReconnect (request->http);
/* Upgrade with encryption... */
httpEncryption (request->http, HTTP_ENCRYPT_REQUIRED);
request->attempts++;
goto again;
}
else if (http_status != HTTP_OK)
{
int http_errno;
http_errno = httpError (request->http);
if (http_errno == EPIPE)
request->state = GTK_CUPS_POST_CONNECT;
else
{
request->state = GTK_CUPS_POST_DONE;
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_HTTP,
http_status,
http_errno,
"HTTP Error in POST %s",
g_strerror (http_errno));
request->poll_state = GTK_CUPS_HTTP_IDLE;
httpFlush (request->http);
return;
}
request->poll_state = GTK_CUPS_HTTP_IDLE;
httpFlush (request->http);
request->last_status = HTTP_CONTINUE;
httpClose (request->http);
request->http = NULL;
return;
}
else
{
request->state = GTK_CUPS_POST_READ_RESPONSE;
return;
}
again:
http_status = HTTP_CONTINUE;
if (httpCheck (request->http))
http_status = httpUpdate (request->http);
request->last_status = http_status;
}
static void
_post_read_response (GtkCupsRequest *request)
{
ipp_state_t ipp_status;
GTK_NOTE (PRINTING,
g_print ("CUPS Backend: %s\n", G_STRFUNC));
request->poll_state = GTK_CUPS_HTTP_READ;
if (request->result->ipp_response == NULL)
request->result->ipp_response = ippNew();
ipp_status = ippRead (request->http,
request->result->ipp_response);
if (ipp_status == IPP_ERROR)
{
int ipp_error = cupsLastError ();
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_IPP,
ipp_status,
ipp_error,
"%s",
ippErrorString (ipp_error));
ippDelete (request->result->ipp_response);
request->result->ipp_response = NULL;
request->state = GTK_CUPS_POST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
}
else if (ipp_status == IPP_DATA)
{
request->state = GTK_CUPS_POST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
}
}
static void
_get_send (GtkCupsRequest *request)
{
GTK_NOTE (PRINTING,
g_print ("CUPS Backend: %s\n", G_STRFUNC));
request->poll_state = GTK_CUPS_HTTP_WRITE;
if (request->data_io == NULL)
{
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_IO,
G_IO_STATUS_ERROR,
G_IO_CHANNEL_ERROR_FAILED,
"Get requires an open io channel");
request->state = GTK_CUPS_GET_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
return;
}
httpClearFields (request->http);
#ifdef HAVE_HTTP_AUTHSTRING
httpSetField (request->http, HTTP_FIELD_AUTHORIZATION, request->http->authstring);
#endif
if (httpGet (request->http, request->resource))
{
if (httpReconnect (request->http))
{
request->state = GTK_CUPS_GET_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
/* TODO: should add a status or error code for failed GET */
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_GENERAL,
0,
0,
"Failed Get");
}
request->attempts++;
return;
}
request->attempts = 0;
request->state = GTK_CUPS_GET_CHECK;
request->poll_state = GTK_CUPS_HTTP_READ;
request->ipp_request->state = IPP_IDLE;
}
static void
_get_check (GtkCupsRequest *request)
{
http_status_t http_status;
GTK_NOTE (PRINTING,
g_print ("CUPS Backend: %s\n", G_STRFUNC));
http_status = request->last_status;
request->poll_state = GTK_CUPS_HTTP_READ;
if (http_status == HTTP_CONTINUE)
{
goto again;
}
else if (http_status == HTTP_UNAUTHORIZED)
{
/* TODO: callout for auth */
g_warning ("NOT IMPLEMENTED: We need to prompt for authorization in a non blocking manner");
request->state = GTK_CUPS_GET_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
/* TODO: should add a status or error code for not implemented */
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_GENERAL,
0,
0,
"Can't prompt for authorization");
return;
}
else if (http_status == HTTP_UPGRADE_REQUIRED)
{
/* Flush any error message... */
httpFlush (request->http);
cupsSetEncryption (HTTP_ENCRYPT_REQUIRED);
request->state = GTK_CUPS_POST_CONNECT;
/* Reconnect... */
httpReconnect (request->http);
/* Upgrade with encryption... */
httpEncryption (request->http, HTTP_ENCRYPT_REQUIRED);
request->attempts++;
goto again;
}
else if (http_status != HTTP_OK)
{
int http_errno;
http_errno = httpError (request->http);
if (http_errno == EPIPE)
request->state = GTK_CUPS_GET_CONNECT;
else
{
request->state = GTK_CUPS_GET_DONE;
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_HTTP,
http_status,
http_errno,
"HTTP Error in GET %s",
g_strerror (http_errno));
request->poll_state = GTK_CUPS_HTTP_IDLE;
httpFlush (request->http);
return;
}
request->poll_state = GTK_CUPS_HTTP_IDLE;
httpFlush (request->http);
httpClose (request->http);
request->last_status = HTTP_CONTINUE;
request->http = NULL;
return;
}
else
{
request->state = GTK_CUPS_GET_READ_DATA;
return;
}
again:
http_status = HTTP_CONTINUE;
if (httpCheck (request->http))
http_status = httpUpdate (request->http);
request->last_status = http_status;
}
static void
_get_read_data (GtkCupsRequest *request)
{
char buffer[_GTK_CUPS_MAX_CHUNK_SIZE];
gsize bytes;
gsize bytes_written;
GIOStatus io_status;
GError *error;
GTK_NOTE (PRINTING,
g_print ("CUPS Backend: %s\n", G_STRFUNC));
error = NULL;
request->poll_state = GTK_CUPS_HTTP_READ;
#if HAVE_CUPS_API_1_2
bytes = httpRead2 (request->http, buffer, sizeof (buffer));
#else
bytes = httpRead (request->http, buffer, sizeof (buffer));
#endif /* HAVE_CUPS_API_1_2 */
GTK_NOTE (PRINTING,
g_print ("CUPS Backend: %i bytes read\n", bytes));
if (bytes == 0)
{
request->state = GTK_CUPS_GET_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
return;
}
io_status =
g_io_channel_write_chars (request->data_io,
buffer,
bytes,
&bytes_written,
&error);
if (io_status == G_IO_STATUS_ERROR)
{
request->state = GTK_CUPS_POST_DONE;
request->poll_state = GTK_CUPS_HTTP_IDLE;
gtk_cups_result_set_error (request->result,
GTK_CUPS_ERROR_IO,
io_status,
error->code,
error->message);
g_error_free (error);
}
}
gboolean
gtk_cups_request_is_done (GtkCupsRequest *request)
{
return (request->state == GTK_CUPS_REQUEST_DONE);
}
gboolean
gtk_cups_result_is_error (GtkCupsResult *result)
{
return result->is_error;
}
ipp_t *
gtk_cups_result_get_response (GtkCupsResult *result)
{
return result->ipp_response;
}
GtkCupsErrorType
gtk_cups_result_get_error_type (GtkCupsResult *result)
{
return result->error_type;
}
int
gtk_cups_result_get_error_status (GtkCupsResult *result)
{
return result->error_status;
}
int
gtk_cups_result_get_error_code (GtkCupsResult *result)
{
return result->error_code;
}
const char *
gtk_cups_result_get_error_string (GtkCupsResult *result)
{
return result->error_msg;
}
/* This function allocates new instance of GtkCupsConnectionTest() and creates
* a socket for communication with a CUPS server 'server'.
*/
GtkCupsConnectionTest *
gtk_cups_connection_test_new (const char *server)
{
GtkCupsConnectionTest *result = NULL;
#ifdef HAVE_CUPS_API_1_2
gchar *port_str = NULL;
result = g_new (GtkCupsConnectionTest, 1);
port_str = g_strdup_printf ("%d", ippPort ());
if (server != NULL)
result->addrlist = httpAddrGetList (server, AF_UNSPEC, port_str);
else
result->addrlist = httpAddrGetList (cupsServer (), AF_UNSPEC, port_str);
g_free (port_str);
result->socket = -1;
result->current_addr = NULL;
result->at_init = GTK_CUPS_CONNECTION_NOT_AVAILABLE;
result->at_init = gtk_cups_connection_test_get_state (result);
#else
result = g_new (GtkCupsConnectionTest, 1);
#endif
return result;
}
/* A non-blocking test whether it is possible to connect to a CUPS server specified
* inside of GtkCupsConnectionTest structure.
* - you need to check it more then once.
* The connection is closed after a successful connection.
*/
GtkCupsConnectionState
gtk_cups_connection_test_get_state (GtkCupsConnectionTest *test)
{
#ifdef HAVE_CUPS_API_1_2
GtkCupsConnectionState result = GTK_CUPS_CONNECTION_NOT_AVAILABLE;
http_addrlist_t *iter;
gint error_code;
gint flags;
gint code;
if (test == NULL)
return GTK_CUPS_CONNECTION_NOT_AVAILABLE;
if (test->at_init == GTK_CUPS_CONNECTION_AVAILABLE)
{
test->at_init = GTK_CUPS_CONNECTION_NOT_AVAILABLE;
return GTK_CUPS_CONNECTION_AVAILABLE;
}
else
{
if (test->socket == -1)
{
iter = test->addrlist;
while (iter)
{
test->socket = socket (iter->addr.addr.sa_family,
SOCK_STREAM,
0);
if (test->socket >= 0)
{
flags = fcntl (test->socket, F_GETFL);
if (flags != -1)
flags |= O_NONBLOCK;
fcntl (test->socket, F_SETFL, flags);
test->current_addr = iter;
break;
}
iter = iter->next;
}
}
if (test->socket >= 0)
{
code = connect (test->socket,
&test->current_addr->addr.addr,
httpAddrLength (&test->current_addr->addr));
error_code = errno;
if (code == 0)
{
close (test->socket);
test->socket = -1;
test->current_addr = NULL;
result = GTK_CUPS_CONNECTION_AVAILABLE;
}
else
{
if (error_code == EALREADY || error_code == EINPROGRESS)
result = GTK_CUPS_CONNECTION_IN_PROGRESS;
else
result = GTK_CUPS_CONNECTION_NOT_AVAILABLE;
}
}
return result;
}
#else
return GTK_CUPS_CONNECTION_AVAILABLE;
#endif
}
/* This function frees memory used by the GtkCupsConnectionTest structure.
*/
void
gtk_cups_connection_test_free (GtkCupsConnectionTest *test)
{
if (test == NULL)
return;
#ifdef HAVE_CUPS_API_1_2
test->current_addr = NULL;
httpAddrFreeList (test->addrlist);
if (test->socket != -1)
{
close (test->socket);
test->socket = -1;
}
#endif
g_free (test);
}
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