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8e29865112
This will catch buggy implementations of GProxyResolver before they are able to return bogus results to higher level code. In particular, if g_proxy_resolver_lookup() returns NULL, it'd better set an error to explain why.
255 lines
7.7 KiB
C
255 lines
7.7 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2010 Collabora, Ltd.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
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*/
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#include "config.h"
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#include "gproxyresolver.h"
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#include <glib.h>
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#include "glibintl.h"
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#include "gasyncresult.h"
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#include "gcancellable.h"
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#include "gtask.h"
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#include "giomodule.h"
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#include "gioerror.h"
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#include "giomodule-priv.h"
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#include "gnetworkingprivate.h"
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/**
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* SECTION:gproxyresolver
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* @short_description: Asynchronous and cancellable network proxy resolver
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* @include: gio/gio.h
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*
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* #GProxyResolver provides synchronous and asynchronous network proxy
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* resolution. #GProxyResolver is used within #GSocketClient through
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* the method g_socket_connectable_proxy_enumerate().
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*
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* Implementations of #GProxyResolver based on libproxy and GNOME settings can
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* be found in glib-networking. GIO comes with an implementation for use inside
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* Flatpak portals.
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*/
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/**
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* GProxyResolverInterface:
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* @g_iface: The parent interface.
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* @is_supported: the virtual function pointer for g_proxy_resolver_is_supported()
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* @lookup: the virtual function pointer for g_proxy_resolver_lookup()
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* @lookup_async: the virtual function pointer for
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* g_proxy_resolver_lookup_async()
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* @lookup_finish: the virtual function pointer for
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* g_proxy_resolver_lookup_finish()
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*
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* The virtual function table for #GProxyResolver.
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*/
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G_DEFINE_INTERFACE (GProxyResolver, g_proxy_resolver, G_TYPE_OBJECT)
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static void
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g_proxy_resolver_default_init (GProxyResolverInterface *iface)
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{
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}
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static GProxyResolver *proxy_resolver_default_singleton = NULL; /* (owned) (atomic) */
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/**
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* g_proxy_resolver_get_default:
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*
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* Gets the default #GProxyResolver for the system.
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*
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* Returns: (not nullable) (transfer none): the default #GProxyResolver, which
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* will be a dummy object if no proxy resolver is available
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*
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* Since: 2.26
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*/
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GProxyResolver *
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g_proxy_resolver_get_default (void)
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{
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if (g_once_init_enter (&proxy_resolver_default_singleton))
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{
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GProxyResolver *singleton;
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singleton = _g_io_module_get_default (G_PROXY_RESOLVER_EXTENSION_POINT_NAME,
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"GIO_USE_PROXY_RESOLVER",
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(GIOModuleVerifyFunc) g_proxy_resolver_is_supported);
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g_once_init_leave (&proxy_resolver_default_singleton, singleton);
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}
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return proxy_resolver_default_singleton;
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}
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/**
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* g_proxy_resolver_is_supported:
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* @resolver: a #GProxyResolver
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*
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* Checks if @resolver can be used on this system. (This is used
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* internally; g_proxy_resolver_get_default() will only return a proxy
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* resolver that returns %TRUE for this method.)
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*
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* Returns: %TRUE if @resolver is supported.
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*
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* Since: 2.26
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*/
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gboolean
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g_proxy_resolver_is_supported (GProxyResolver *resolver)
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{
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GProxyResolverInterface *iface;
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g_return_val_if_fail (G_IS_PROXY_RESOLVER (resolver), FALSE);
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iface = G_PROXY_RESOLVER_GET_IFACE (resolver);
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return (* iface->is_supported) (resolver);
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}
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/**
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* g_proxy_resolver_lookup:
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* @resolver: a #GProxyResolver
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* @uri: a URI representing the destination to connect to
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* @cancellable: (nullable): a #GCancellable, or %NULL
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* @error: return location for a #GError, or %NULL
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*
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* Looks into the system proxy configuration to determine what proxy,
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* if any, to use to connect to @uri. The returned proxy URIs are of
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* the form `<protocol>://[user[:password]@]host:port` or
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* `direct://`, where <protocol> could be http, rtsp, socks
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* or other proxying protocol.
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*
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* If you don't know what network protocol is being used on the
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* socket, you should use `none` as the URI protocol.
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* In this case, the resolver might still return a generic proxy type
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* (such as SOCKS), but would not return protocol-specific proxy types
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* (such as http).
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*
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* `direct://` is used when no proxy is needed.
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* Direct connection should not be attempted unless it is part of the
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* returned array of proxies.
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*
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* Returns: (transfer full) (array zero-terminated=1): A
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* NULL-terminated array of proxy URIs. Must be freed
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* with g_strfreev().
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*
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* Since: 2.26
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*/
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gchar **
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g_proxy_resolver_lookup (GProxyResolver *resolver,
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const gchar *uri,
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GCancellable *cancellable,
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GError **error)
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{
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GProxyResolverInterface *iface;
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gchar **proxy_uris;
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g_return_val_if_fail (G_IS_PROXY_RESOLVER (resolver), NULL);
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g_return_val_if_fail (uri != NULL, NULL);
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if (!g_uri_is_valid (uri, G_URI_FLAGS_NONE, NULL))
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{
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
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"Invalid URI ‘%s’", uri);
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return NULL;
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}
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iface = G_PROXY_RESOLVER_GET_IFACE (resolver);
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proxy_uris = (* iface->lookup) (resolver, uri, cancellable, error);
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if (proxy_uris == NULL && error != NULL)
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g_assert (*error != NULL);
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return proxy_uris;
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}
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/**
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* g_proxy_resolver_lookup_async:
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* @resolver: a #GProxyResolver
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* @uri: a URI representing the destination to connect to
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* @cancellable: (nullable): a #GCancellable, or %NULL
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* @callback: (scope async): callback to call after resolution completes
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* @user_data: (closure): data for @callback
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*
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* Asynchronous lookup of proxy. See g_proxy_resolver_lookup() for more
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* details.
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*
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* Since: 2.26
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*/
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void
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g_proxy_resolver_lookup_async (GProxyResolver *resolver,
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const gchar *uri,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer user_data)
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{
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GProxyResolverInterface *iface;
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GError *error = NULL;
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g_return_if_fail (G_IS_PROXY_RESOLVER (resolver));
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g_return_if_fail (uri != NULL);
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if (!g_uri_is_valid (uri, G_URI_FLAGS_NONE, NULL))
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{
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g_set_error (&error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
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"Invalid URI ‘%s’", uri);
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g_task_report_error (resolver, callback, user_data,
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g_proxy_resolver_lookup_async,
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g_steal_pointer (&error));
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return;
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}
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iface = G_PROXY_RESOLVER_GET_IFACE (resolver);
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(* iface->lookup_async) (resolver, uri, cancellable, callback, user_data);
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}
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/**
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* g_proxy_resolver_lookup_finish:
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* @resolver: a #GProxyResolver
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* @result: the result passed to your #GAsyncReadyCallback
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* @error: return location for a #GError, or %NULL
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*
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* Call this function to obtain the array of proxy URIs when
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* g_proxy_resolver_lookup_async() is complete. See
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* g_proxy_resolver_lookup() for more details.
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*
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* Returns: (transfer full) (array zero-terminated=1): A
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* NULL-terminated array of proxy URIs. Must be freed
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* with g_strfreev().
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*
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* Since: 2.26
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*/
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gchar **
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g_proxy_resolver_lookup_finish (GProxyResolver *resolver,
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GAsyncResult *result,
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GError **error)
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{
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GProxyResolverInterface *iface;
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gchar **proxy_uris;
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g_return_val_if_fail (G_IS_PROXY_RESOLVER (resolver), NULL);
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iface = G_PROXY_RESOLVER_GET_IFACE (resolver);
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proxy_uris = (* iface->lookup_finish) (resolver, result, error);
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if (proxy_uris == NULL && error != NULL)
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g_assert (*error != NULL);
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return proxy_uris;
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}
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