gio/gproxyresolver.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2010 Collabora, Ltd.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
  19  */
  20
  21 #include "config.h"
  22
  23 #include "gproxyresolver.h"
  24
  25 #include <glib.h>
  26 #include "glibintl.h"
  27
  28 #include "gasyncresult.h"
  29 #include "gcancellable.h"
  30 #include "giomodule.h"
  31 #include "giomodule-priv.h"
  32
  33 /**
  34  * SECTION:gproxyresolver
  35  * @short_description: Asynchronous and cancellable network proxy resolver
  36  * @include: gio/gio.h
  37  *
  38  * #GProxyResolver provides synchronous and asynchronous network proxy
  39  * resolution. #GProxyResolver is used within #GSocketClient through
  40  * the method g_socket_connectable_proxy_enumerate().
  41  *
  42  * Implementations of #GProxyResolver based on libproxy and GNOME settings can
  43  * be found in glib-networking. GIO comes with an implementation for use inside
  44  * Flatpak portals.
  45  */
  46
  47 /**
  48  * GProxyResolverInterface:
  49  * @g_iface: The parent interface.
  50  * @is_supported: the virtual function pointer for g_proxy_resolver_is_supported()
  51  * @lookup: the virtual function pointer for g_proxy_resolver_lookup()
  52  * @lookup_async: the virtual function pointer for
  53  *  g_proxy_resolver_lookup_async()
  54  * @lookup_finish: the virtual function pointer for
  55  *  g_proxy_resolver_lookup_finish()
  56  *
  57  * The virtual function table for #GProxyResolver.
  58  */
  59
  60 G_DEFINE_INTERFACE (GProxyResolver, g_proxy_resolver, G_TYPE_OBJECT)
  61
  62 static void
  63 g_proxy_resolver_default_init (GProxyResolverInterface *iface)
  64 {
  65 }
  66
  67 /**
  68  * g_proxy_resolver_get_default:
  69  *
  70  * Gets the default #GProxyResolver for the system.
  71  *
  72  * Returns: (transfer none): the default #GProxyResolver.
  73  *
  74  * Since: 2.26
  75  */
  76 GProxyResolver *
  77 g_proxy_resolver_get_default (void)
  78 {
  79   return _g_io_module_get_default (G_PROXY_RESOLVER_EXTENSION_POINT_NAME,
  80                                    "GIO_USE_PROXY_RESOLVER",
  81                                    (GIOModuleVerifyFunc)g_proxy_resolver_is_supported);
  82 }
  83
  84 /**
  85  * g_proxy_resolver_is_supported:
  86  * @resolver: a #GProxyResolver
  87  *
  88  * Checks if @resolver can be used on this system. (This is used
  89  * internally; g_proxy_resolver_get_default() will only return a proxy
  90  * resolver that returns %TRUE for this method.)
  91  *
  92  * Returns: %TRUE if @resolver is supported.
  93  *
  94  * Since: 2.26
  95  */
  96 gboolean
  97 g_proxy_resolver_is_supported (GProxyResolver *resolver)
  98 {
  99   GProxyResolverInterface *iface;
 100
 101   g_return_val_if_fail (G_IS_PROXY_RESOLVER (resolver), FALSE);
 102
 103   iface = G_PROXY_RESOLVER_GET_IFACE (resolver);
 104
 105   return (* iface->is_supported) (resolver);
 106 }
 107
 108 /**
 109  * g_proxy_resolver_lookup:
 110  * @resolver: a #GProxyResolver
 111  * @uri: a URI representing the destination to connect to
 112  * @cancellable: (nullable): a #GCancellable, or %NULL
 113  * @error: return location for a #GError, or %NULL
 114  *
 115  * Looks into the system proxy configuration to determine what proxy,
 116  * if any, to use to connect to @uri. The returned proxy URIs are of
 117  * the form `<protocol>://[user[:password]@]host:port` or
 118  * `direct://`, where <protocol> could be http, rtsp, socks
 119  * or other proxying protocol.
 120  *
 121  * If you don't know what network protocol is being used on the
 122  * socket, you should use `none` as the URI protocol.
 123  * In this case, the resolver might still return a generic proxy type
 124  * (such as SOCKS), but would not return protocol-specific proxy types
 125  * (such as http).
 126  *
 127  * `direct://` is used when no proxy is needed.
 128  * Direct connection should not be attempted unless it is part of the
 129  * returned array of proxies.
 130  *
 131  * Returns: (transfer full) (array zero-terminated=1): A
 132  *               NULL-terminated array of proxy URIs. Must be freed
 133  *               with g_strfreev().
 134  *
 135  * Since: 2.26
 136  */
 137 gchar **
 138 g_proxy_resolver_lookup (GProxyResolver  *resolver,
 139                          const gchar     *uri,
 140                          GCancellable    *cancellable,
 141                          GError         **error)
 142 {
 143   GProxyResolverInterface *iface;
 144
 145   g_return_val_if_fail (G_IS_PROXY_RESOLVER (resolver), NULL);
 146   g_return_val_if_fail (uri != NULL, NULL);
 147
 148   iface = G_PROXY_RESOLVER_GET_IFACE (resolver);
 149
 150   return (* iface->lookup) (resolver, uri, cancellable, error);
 151 }
 152
 153 /**
 154  * g_proxy_resolver_lookup_async:
 155  * @resolver: a #GProxyResolver
 156  * @uri: a URI representing the destination to connect to
 157  * @cancellable: (nullable): a #GCancellable, or %NULL
 158  * @callback: (scope async): callback to call after resolution completes
 159  * @user_data: (closure): data for @callback
 160  *
 161  * Asynchronous lookup of proxy. See g_proxy_resolver_lookup() for more
 162  * details.
 163  *
 164  * Since: 2.26
 165  */
 166 void
 167 g_proxy_resolver_lookup_async (GProxyResolver      *resolver,
 168                                const gchar         *uri,
 169                                GCancellable        *cancellable,
 170                                GAsyncReadyCallback  callback,
 171                                gpointer             user_data)
 172 {
 173   GProxyResolverInterface *iface;
 174
 175   g_return_if_fail (G_IS_PROXY_RESOLVER (resolver));
 176   g_return_if_fail (uri != NULL);
 177
 178   iface = G_PROXY_RESOLVER_GET_IFACE (resolver);
 179
 180   (* iface->lookup_async) (resolver, uri, cancellable, callback, user_data);
 181 }
 182
 183 /**
 184  * g_proxy_resolver_lookup_finish:
 185  * @resolver: a #GProxyResolver
 186  * @result: the result passed to your #GAsyncReadyCallback
 187  * @error: return location for a #GError, or %NULL
 188  *
 189  * Call this function to obtain the array of proxy URIs when
 190  * g_proxy_resolver_lookup_async() is complete. See
 191  * g_proxy_resolver_lookup() for more details.
 192  *
 193  * Returns: (transfer full) (array zero-terminated=1): A
 194  *               NULL-terminated array of proxy URIs. Must be freed
 195  *               with g_strfreev().
 196  *
 197  * Since: 2.26
 198  */
 199 gchar **
 200 g_proxy_resolver_lookup_finish (GProxyResolver     *resolver,
 201                                 GAsyncResult       *result,
 202                                 GError            **error)
 203 {
 204   GProxyResolverInterface *iface;
 205
 206   g_return_val_if_fail (G_IS_PROXY_RESOLVER (resolver), NULL);
 207
 208   iface = G_PROXY_RESOLVER_GET_IFACE (resolver);
 209
 210   return (* iface->lookup_finish) (resolver, result, error);
 211 }