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Add GResolver, a glib-ish interface to DNS
GResolver provides asynchronous (and synchronous-but-cancellable) APIs for resolving hostnames, reverse-resolving IP addresses back to hostnames, and resolving SRV records. Part of #548466.
This commit is contained in:
Dan Winship
855
gio/gresolver.c
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855
gio/gresolver.c
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@@ -0,0 +1,855 @@
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2008 Red Hat, Inc.
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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 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include "glibintl.h"
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#include "gresolver.h"
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#include "gnetworkingprivate.h"
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#include "gasyncresult.h"
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#include "ginetaddress.h"
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#include "ginetsocketaddress.h"
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#include "gsimpleasyncresult.h"
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#include "gsrvtarget.h"
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#ifdef G_OS_UNIX
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#include "gunixresolver.h"
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#endif
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#ifdef G_OS_WIN32
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#include "gwin32resolver.h"
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#endif
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#include <stdlib.h>
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#include "gioalias.h"
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/**
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* SECTION:gresolver
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* @short_description: Asynchronous and cancellable DNS resolver
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* @include: gio/gio.h
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*
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* #GResolver provides cancellable synchronous and asynchronous DNS
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* resolution, for hostnames (g_resolver_lookup_by_address(),
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* g_resolver_lookup_by_name() and their async variants) and SRV
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* (service) records (g_resolver_lookup_service()).
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**/
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/**
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* GResolver:
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*
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* The object that handles DNS resolution. Use g_resolver_get_default()
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* to get the default resolver.
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*/
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G_DEFINE_TYPE (GResolver, g_resolver, G_TYPE_OBJECT)
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static void
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g_resolver_class_init (GResolverClass *resolver_class)
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{
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/* Make sure _g_networking_init() has been called */
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(void) g_inet_address_get_type ();
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/* Initialize _g_resolver_addrinfo_hints */
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#ifdef AI_ADDRCONFIG
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_g_resolver_addrinfo_hints.ai_flags |= AI_ADDRCONFIG;
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#endif
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/* These two don't actually matter, they just get copied into the
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* returned addrinfo structures (and then we ignore them). But if
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* we leave them unset, we'll get back duplicate answers.
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*/
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_g_resolver_addrinfo_hints.ai_socktype = SOCK_STREAM;
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_g_resolver_addrinfo_hints.ai_protocol = IPPROTO_TCP;
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}
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static void
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g_resolver_init (GResolver *resolver)
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{
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;
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}
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static GResolver *default_resolver;
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/**
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* g_resolver_get_default:
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*
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* Gets the default #GResolver. You should unref it when you are done
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* with it. #GResolver may use its reference count as a hint about how
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* many threads/processes, etc it should allocate for concurrent DNS
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* resolutions.
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*
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* Return value: the #GResolver.
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*
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* Since: 2.22
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**/
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GResolver *
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g_resolver_get_default (void)
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{
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if (!default_resolver)
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{
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if (g_thread_supported ())
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default_resolver = g_object_new (G_TYPE_THREADED_RESOLVER, NULL);
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else
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{
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#if defined(G_OS_UNIX)
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default_resolver = g_object_new (G_TYPE_UNIX_RESOLVER, NULL);
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#elif defined(G_OS_WIN32)
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default_resolver = g_object_new (G_TYPE_WIN32_RESOLVER, NULL);
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#endif
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}
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}
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return g_object_ref (default_resolver);
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}
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/**
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* g_resolver_set_default:
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* @resolver: the new default #GResolver
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*
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* Sets @resolver to be the application's default resolver (reffing
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* @resolver, and unreffing the previous default resolver, if any).
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* Future calls to g_resolver_get_default() will return this resolver.
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*
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* This can be used if an application wants to perform any sort of DNS
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* caching or "pinning"; it can implement its own #GResolver that
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* calls the original default resolver for DNS operations, and
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* implements its own cache policies on top of that, and then set
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* itself as the default resolver for all later code to use.
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*
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* Since: 2.22
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**/
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void
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g_resolver_set_default (GResolver *resolver)
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{
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if (default_resolver)
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g_object_unref (default_resolver);
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default_resolver = g_object_ref (resolver);
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}
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/**
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* g_resolver_lookup_by_name:
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* @resolver: a #GResolver
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* @hostname: the hostname to look up
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* @cancellable: a #GCancellable, or %NULL
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* @error: return location for a #GError, or %NULL
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*
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* Synchronously resolves @hostname to determine its associated IP
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* address(es). @hostname may be an ASCII-only or UTF-8 hostname, or
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* the textual form of an IP address (in which case this just becomes
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* a wrapper around g_inet_address_new_from_string()).
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*
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* On success, g_resolver_lookup_by_name() will return a #GList of
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* #GInetAddress, sorted in order of preference. (That is, you should
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* attempt to connect to the first address first, then the second if
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* the first fails, etc.)
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*
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* If the DNS resolution fails, @error (if non-%NULL) will be set to a
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* value from #GResolverError.
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*
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* If @cancellable is non-%NULL, it can be used to cancel the
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* operation, in which case @error (if non-%NULL) will be set to
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* %G_IO_ERROR_CANCELLED.
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*
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* Return value: a #GList of #GInetAddress, or %NULL on error. You
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* must unref each of the addresses and free the list when you are
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* done with it. (You can use g_resolver_free_addresses() to do this.)
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*
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* Since: 2.22
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**/
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GList *
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g_resolver_lookup_by_name (GResolver *resolver,
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const gchar *hostname,
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GCancellable *cancellable,
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GError **error)
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{
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GInetAddress *addr;
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GList *addrs;
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gchar *ascii_hostname = NULL;
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g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
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g_return_val_if_fail (hostname != NULL, NULL);
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/* Check if @hostname is just an IP address */
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addr = g_inet_address_new_from_string (hostname);
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if (addr)
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return g_list_append (NULL, addr);
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if (g_hostname_is_non_ascii (hostname))
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hostname = ascii_hostname = g_hostname_to_ascii (hostname);
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addrs = G_RESOLVER_GET_CLASS (resolver)->
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lookup_by_name (resolver, hostname, cancellable, error);
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g_free (ascii_hostname);
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return addrs;
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}
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/**
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* g_resolver_lookup_by_name_async:
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* @resolver: a #GResolver
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* @hostname: the hostname to look up the address of
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* @cancellable: a #GCancellable, or %NULL
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* @callback: callback to call after resolution completes
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* @user_data: data for @callback
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*
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* Begins asynchronously resolving @hostname to determine its
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* associated IP address(es), and eventually calls @callback, which
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* must call g_resolver_lookup_by_name_finish() to get the result. See
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* g_resolver_lookup_by_name() for more details.
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*
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* Since: 2.22
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**/
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void
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g_resolver_lookup_by_name_async (GResolver *resolver,
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const gchar *hostname,
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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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GInetAddress *addr;
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gchar *ascii_hostname = NULL;
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g_return_if_fail (G_IS_RESOLVER (resolver));
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g_return_if_fail (hostname != NULL);
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/* Check if @hostname is just an IP address */
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addr = g_inet_address_new_from_string (hostname);
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if (addr)
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{
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GSimpleAsyncResult *simple;
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GList *addrs;
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simple = g_simple_async_result_new (G_OBJECT (resolver),
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callback, user_data,
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g_resolver_lookup_by_name_async);
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addrs = g_list_append (NULL, addr);
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g_simple_async_result_set_op_res_gpointer (simple, addrs, (GDestroyNotify)g_resolver_free_addresses);
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g_simple_async_result_complete_in_idle (simple);
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g_object_unref (simple);
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return;
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}
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if (g_hostname_is_non_ascii (hostname))
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hostname = ascii_hostname = g_hostname_to_ascii (hostname);
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G_RESOLVER_GET_CLASS (resolver)->
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lookup_by_name_async (resolver, hostname, cancellable, callback, user_data);
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g_free (ascii_hostname);
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}
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/**
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* g_resolver_lookup_by_name_finish:
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* @resolver: a #GResolver
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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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* Retrieves the result of a call to
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* g_resolver_lookup_by_name_async().
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*
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* If the DNS resolution failed, @error (if non-%NULL) will be set to
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* a value from #GResolverError. If the operation was cancelled,
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* @error will be set to %G_IO_ERROR_CANCELLED.
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*
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* Return value: a #GList of #GInetAddress, or %NULL on error. See
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* g_resolver_lookup_by_name() for more details.
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*
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* Since: 2.22
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**/
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GList *
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g_resolver_lookup_by_name_finish (GResolver *resolver,
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GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
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if (G_IS_SIMPLE_ASYNC_RESULT (result))
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{
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GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
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if (g_simple_async_result_propagate_error (simple, error))
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return NULL;
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/* Handle the stringified-IP-addr case */
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if (g_simple_async_result_get_source_tag (simple) == g_resolver_lookup_by_name_async)
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{
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GList *addrs;
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addrs = g_simple_async_result_get_op_res_gpointer (simple);
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g_simple_async_result_set_op_res_gpointer (simple, NULL, NULL);
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return addrs;
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}
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}
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return G_RESOLVER_GET_CLASS (resolver)->
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lookup_by_name_finish (resolver, result, error);
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}
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/**
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* g_resolver_free_addresses:
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* @addresses: a #GList of #GInetAddress
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*
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* Frees @addresses (which should be the return value from
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* g_resolver_lookup_by_name() or g_resolver_lookup_by_name_finish()).
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* (This is a convenience method; you can also simply free the results
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* by hand.)
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*
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* Since: 2.22
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**/
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void
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g_resolver_free_addresses (GList *addresses)
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{
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GList *a;
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for (a = addresses; a; a = a->next)
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g_object_unref (a->data);
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g_list_free (addresses);
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}
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/**
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* g_resolver_lookup_by_address:
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* @resolver: a #GResolver
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* @address: the address to reverse-resolve
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* @cancellable: a #GCancellable, or %NULL
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* @error: return location for a #GError, or %NULL
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*
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* Synchronously reverse-resolves @address to determine its
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* associated hostname.
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*
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* If the DNS resolution fails, @error (if non-%NULL) will be set to
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* a value from #GResolverError.
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*
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* If @cancellable is non-%NULL, it can be used to cancel the
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* operation, in which case @error (if non-%NULL) will be set to
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* %G_IO_ERROR_CANCELLED.
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*
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* Return value: a hostname (either ASCII-only, or in ASCII-encoded
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* form), or %NULL on error.
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*
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* Since: 2.22
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**/
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gchar *
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g_resolver_lookup_by_address (GResolver *resolver,
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GInetAddress *address,
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GCancellable *cancellable,
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GError **error)
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{
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g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
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g_return_val_if_fail (G_IS_INET_ADDRESS (address), NULL);
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return G_RESOLVER_GET_CLASS (resolver)->
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lookup_by_address (resolver, address, cancellable, error);
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}
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/**
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* g_resolver_lookup_by_address_async:
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* @resolver: a #GResolver
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* @address: the address to reverse-resolve
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* @cancellable: a #GCancellable, or %NULL
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* @callback: callback to call after resolution completes
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* @user_data: data for @callback
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*
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* Begins asynchronously reverse-resolving @address to determine its
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* associated hostname, and eventually calls @callback, which must
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* call g_resolver_lookup_by_address_finish() to get the final result.
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*
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* Since: 2.22
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**/
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void
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g_resolver_lookup_by_address_async (GResolver *resolver,
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GInetAddress *address,
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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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g_return_if_fail (G_IS_RESOLVER (resolver));
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g_return_if_fail (G_IS_INET_ADDRESS (address));
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G_RESOLVER_GET_CLASS (resolver)->
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lookup_by_address_async (resolver, address, cancellable, callback, user_data);
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}
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/**
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* g_resolver_lookup_by_address_finish:
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* @resolver: a #GResolver
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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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* Retrieves the result of a previous call to
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* g_resolver_lookup_by_address_async().
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*
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* If the DNS resolution failed, @error (if non-%NULL) will be set to
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* a value from #GResolverError. If the operation was cancelled,
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* @error will be set to %G_IO_ERROR_CANCELLED.
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*
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* Return value: a hostname (either ASCII-only, or in ASCII-encoded
|
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* form), or %NULL on error.
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*
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* Since: 2.22
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**/
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gchar *
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g_resolver_lookup_by_address_finish (GResolver *resolver,
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GAsyncResult *result,
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GError **error)
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{
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g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
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if (G_IS_SIMPLE_ASYNC_RESULT (result))
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{
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GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
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if (g_simple_async_result_propagate_error (simple, error))
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return NULL;
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}
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return G_RESOLVER_GET_CLASS (resolver)->
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lookup_by_address_finish (resolver, result, error);
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}
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static gchar *
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g_resolver_get_service_rrname (const char *service,
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const char *protocol,
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const char *domain)
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{
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gchar *rrname, *ascii_domain = NULL;
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if (g_hostname_is_non_ascii (domain))
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domain = ascii_domain = g_hostname_to_ascii (domain);
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rrname = g_strdup_printf ("_%s._%s.%s", service, protocol, domain);
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g_free (ascii_domain);
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return rrname;
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}
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/**
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* g_resolver_lookup_service:
|
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* @resolver: a #GResolver
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||||
* @service: the service type to look up (eg, "ldap")
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||||
* @protocol: the networking protocol to use for @service (eg, "tcp")
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||||
* @domain: the DNS domain to look up the service in
|
||||
* @cancellable: a #GCancellable, or %NULL
|
||||
* @error: return location for a #GError, or %NULL
|
||||
*
|
||||
* Synchronously performs a DNS SRV lookup for the given @service and
|
||||
* @protocol in the given @domain and returns an array of #GSrvTarget.
|
||||
* @domain may be an ASCII-only or UTF-8 hostname. Note also that the
|
||||
* @service and @protocol arguments <emphasis>do not</emphasis>
|
||||
* include the leading underscore that appears in the actual DNS
|
||||
* entry.
|
||||
*
|
||||
* On success, g_resolver_lookup_service() will return a #GList of
|
||||
* #GSrvTarget, sorted in order of preference. (That is, you should
|
||||
* attempt to connect to the first target first, then the second if
|
||||
* the first fails, etc.)
|
||||
*
|
||||
* If the DNS resolution fails, @error (if non-%NULL) will be set to
|
||||
* a value from #GResolverError.
|
||||
*
|
||||
* If @cancellable is non-%NULL, it can be used to cancel the
|
||||
* operation, in which case @error (if non-%NULL) will be set to
|
||||
* %G_IO_ERROR_CANCELLED.
|
||||
*
|
||||
* Return value: a #GList of #GSrvTarget, or %NULL on error. You must
|
||||
* free each of the targets and the list when you are done with it.
|
||||
* (You can use g_resolver_free_targets() to do this.)
|
||||
*
|
||||
* Since: 2.22
|
||||
**/
|
||||
GList *
|
||||
g_resolver_lookup_service (GResolver *resolver,
|
||||
const gchar *service,
|
||||
const gchar *protocol,
|
||||
const gchar *domain,
|
||||
GCancellable *cancellable,
|
||||
GError **error)
|
||||
{
|
||||
GList *targets;
|
||||
gchar *rrname;
|
||||
|
||||
g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
|
||||
g_return_val_if_fail (service != NULL, NULL);
|
||||
g_return_val_if_fail (protocol != NULL, NULL);
|
||||
g_return_val_if_fail (domain != NULL, NULL);
|
||||
|
||||
rrname = g_resolver_get_service_rrname (service, protocol, domain);
|
||||
|
||||
targets = G_RESOLVER_GET_CLASS (resolver)->
|
||||
lookup_service (resolver, rrname, cancellable, error);
|
||||
|
||||
g_free (rrname);
|
||||
return targets;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_resolver_lookup_service_async:
|
||||
* @resolver: a #GResolver
|
||||
* @service: the service type to look up (eg, "ldap")
|
||||
* @protocol: the networking protocol to use for @service (eg, "tcp")
|
||||
* @domain: the DNS domain to look up the service in
|
||||
* @cancellable: a #GCancellable, or %NULL
|
||||
* @callback: callback to call after resolution completes
|
||||
* @user_data: data for @callback
|
||||
*
|
||||
* Begins asynchronously performing a DNS SRV lookup for the given
|
||||
* @service and @protocol in the given @domain, and eventually calls
|
||||
* @callback, which must call g_resolver_lookup_service_finish() to
|
||||
* get the final result. See g_resolver_lookup_service() for more
|
||||
* details.
|
||||
*
|
||||
* Since: 2.22
|
||||
**/
|
||||
void
|
||||
g_resolver_lookup_service_async (GResolver *resolver,
|
||||
const gchar *service,
|
||||
const gchar *protocol,
|
||||
const gchar *domain,
|
||||
GCancellable *cancellable,
|
||||
GAsyncReadyCallback callback,
|
||||
gpointer user_data)
|
||||
{
|
||||
gchar *rrname;
|
||||
|
||||
g_return_if_fail (G_IS_RESOLVER (resolver));
|
||||
g_return_if_fail (service != NULL);
|
||||
g_return_if_fail (protocol != NULL);
|
||||
g_return_if_fail (domain != NULL);
|
||||
|
||||
rrname = g_resolver_get_service_rrname (service, protocol, domain);
|
||||
|
||||
G_RESOLVER_GET_CLASS (resolver)->
|
||||
lookup_service_async (resolver, rrname, cancellable, callback, user_data);
|
||||
|
||||
g_free (rrname);
|
||||
}
|
||||
|
||||
/**
|
||||
* g_resolver_lookup_service_finish:
|
||||
* @resolver: a #GResolver
|
||||
* @result: the result passed to your #GAsyncReadyCallback
|
||||
* @error: return location for a #GError, or %NULL
|
||||
*
|
||||
* Retrieves the result of a previous call to
|
||||
* g_resolver_lookup_service_async().
|
||||
*
|
||||
* If the DNS resolution failed, @error (if non-%NULL) will be set to
|
||||
* a value from #GResolverError. If the operation was cancelled,
|
||||
* @error will be set to %G_IO_ERROR_CANCELLED.
|
||||
*
|
||||
* Return value: a #GList of #GSrvTarget, or %NULL on error. See
|
||||
* g_resolver_lookup_service() for more details.
|
||||
*
|
||||
* Since: 2.22
|
||||
**/
|
||||
GList *
|
||||
g_resolver_lookup_service_finish (GResolver *resolver,
|
||||
GAsyncResult *result,
|
||||
GError **error)
|
||||
{
|
||||
g_return_val_if_fail (G_IS_RESOLVER (resolver), NULL);
|
||||
|
||||
if (G_IS_SIMPLE_ASYNC_RESULT (result))
|
||||
{
|
||||
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
|
||||
|
||||
if (g_simple_async_result_propagate_error (simple, error))
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return G_RESOLVER_GET_CLASS (resolver)->
|
||||
lookup_service_finish (resolver, result, error);
|
||||
}
|
||||
|
||||
/**
|
||||
* g_resolver_free_targets:
|
||||
* @targets: a #GList of #GSrvTarget
|
||||
*
|
||||
* Frees @targets (which should be the return value from
|
||||
* g_resolver_lookup_service() or g_resolver_lookup_service_finish()).
|
||||
* (This is a convenience method; you can also simply free the
|
||||
* results by hand.)
|
||||
*
|
||||
* Since: 2.22
|
||||
**/
|
||||
void
|
||||
g_resolver_free_targets (GList *targets)
|
||||
{
|
||||
GList *t;
|
||||
|
||||
for (t = targets; t; t = t->next)
|
||||
g_srv_target_free (t->data);
|
||||
g_list_free (targets);
|
||||
}
|
||||
|
||||
/**
|
||||
* g_resolver_error_quark:
|
||||
*
|
||||
* Gets the #GResolver Error Quark.
|
||||
*
|
||||
* Return value: a #GQuark.
|
||||
*
|
||||
* Since: 2.22
|
||||
**/
|
||||
GQuark
|
||||
g_resolver_error_quark (void)
|
||||
{
|
||||
return g_quark_from_static_string ("g-resolver-error-quark");
|
||||
}
|
||||
|
||||
|
||||
static GResolverError
|
||||
g_resolver_error_from_addrinfo_error (gint err)
|
||||
{
|
||||
switch (err)
|
||||
{
|
||||
case EAI_FAIL:
|
||||
case EAI_NODATA:
|
||||
case EAI_NONAME:
|
||||
return G_RESOLVER_ERROR_NOT_FOUND;
|
||||
|
||||
case EAI_AGAIN:
|
||||
return G_RESOLVER_ERROR_TEMPORARY_FAILURE;
|
||||
|
||||
default:
|
||||
return G_RESOLVER_ERROR_INTERNAL;
|
||||
}
|
||||
}
|
||||
|
||||
struct addrinfo _g_resolver_addrinfo_hints;
|
||||
|
||||
/* Private method to process a getaddrinfo() response. */
|
||||
GList *
|
||||
_g_resolver_addresses_from_addrinfo (const char *hostname,
|
||||
struct addrinfo *res,
|
||||
gint gai_retval,
|
||||
GError **error)
|
||||
{
|
||||
struct addrinfo *ai;
|
||||
GSocketAddress *sockaddr;
|
||||
GInetAddress *addr;
|
||||
GList *addrs;
|
||||
|
||||
if (gai_retval != 0)
|
||||
{
|
||||
g_set_error (error, G_RESOLVER_ERROR,
|
||||
g_resolver_error_from_addrinfo_error (gai_retval),
|
||||
_("Error resolving '%s': %s"),
|
||||
hostname, gai_strerror (gai_retval));
|
||||
return NULL;
|
||||
}
|
||||
|
||||
g_return_val_if_fail (res != NULL, NULL);
|
||||
|
||||
addrs = NULL;
|
||||
for (ai = res; ai; ai = ai->ai_next)
|
||||
{
|
||||
sockaddr = g_socket_address_new_from_native (ai->ai_addr, ai->ai_addrlen);
|
||||
if (!sockaddr || !G_IS_INET_SOCKET_ADDRESS (sockaddr))
|
||||
continue;
|
||||
|
||||
addr = g_object_ref (g_inet_socket_address_get_address ((GInetSocketAddress *)sockaddr));
|
||||
addrs = g_list_prepend (addrs, addr);
|
||||
g_object_unref (sockaddr);
|
||||
}
|
||||
|
||||
return g_list_reverse (addrs);
|
||||
}
|
||||
|
||||
/* Private method to set up a getnameinfo() request */
|
||||
void
|
||||
_g_resolver_address_to_sockaddr (GInetAddress *address,
|
||||
struct sockaddr_storage *sa,
|
||||
gsize *sa_len)
|
||||
{
|
||||
GSocketAddress *sockaddr;
|
||||
|
||||
sockaddr = g_inet_socket_address_new (address, 0);
|
||||
g_socket_address_to_native (sockaddr, (struct sockaddr *)sa, sizeof (*sa));
|
||||
*sa_len = g_socket_address_get_native_size (sockaddr);
|
||||
g_object_unref (sockaddr);
|
||||
}
|
||||
|
||||
/* Private method to process a getnameinfo() response. */
|
||||
char *
|
||||
_g_resolver_name_from_nameinfo (GInetAddress *address,
|
||||
const gchar *name,
|
||||
gint gni_retval,
|
||||
GError **error)
|
||||
{
|
||||
if (gni_retval != 0)
|
||||
{
|
||||
gchar *phys;
|
||||
|
||||
phys = g_inet_address_to_string (address);
|
||||
g_set_error (error, G_RESOLVER_ERROR,
|
||||
g_resolver_error_from_addrinfo_error (gni_retval),
|
||||
_("Error reverse-resolving '%s': %s"),
|
||||
phys ? phys : "(unknown)", gai_strerror (gni_retval));
|
||||
g_free (phys);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return g_strdup (name);
|
||||
}
|
||||
|
||||
#if defined(G_OS_UNIX)
|
||||
/* Private method to process a res_query response into GSrvTargets */
|
||||
GList *
|
||||
_g_resolver_targets_from_res_query (const gchar *rrname,
|
||||
guchar *answer,
|
||||
gint len,
|
||||
gint herr,
|
||||
GError **error)
|
||||
{
|
||||
gint count;
|
||||
gchar namebuf[1024];
|
||||
guchar *end, *p;
|
||||
guint16 type, qclass, rdlength, priority, weight, port;
|
||||
guint32 ttl;
|
||||
HEADER *header;
|
||||
GSrvTarget *target;
|
||||
GList *targets;
|
||||
|
||||
if (len <= 0)
|
||||
{
|
||||
GResolverError errnum;
|
||||
const gchar *format;
|
||||
|
||||
if (len == 0 || herr == HOST_NOT_FOUND || herr == NO_DATA)
|
||||
{
|
||||
errnum = G_RESOLVER_ERROR_NOT_FOUND;
|
||||
format = _("No service record for '%s'");
|
||||
}
|
||||
else if (herr == TRY_AGAIN)
|
||||
{
|
||||
errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE;
|
||||
format = _("Temporarily unable to resolve '%s'");
|
||||
}
|
||||
else
|
||||
{
|
||||
errnum = G_RESOLVER_ERROR_INTERNAL;
|
||||
format = _("Error resolving '%s'");
|
||||
}
|
||||
|
||||
g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
targets = NULL;
|
||||
|
||||
header = (HEADER *)answer;
|
||||
p = answer + sizeof (HEADER);
|
||||
end = answer + len;
|
||||
|
||||
/* Skip query */
|
||||
count = ntohs (header->qdcount);
|
||||
while (count-- && p < end)
|
||||
{
|
||||
p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
|
||||
p += 4;
|
||||
}
|
||||
|
||||
/* Read answers */
|
||||
count = ntohs (header->ancount);
|
||||
while (count-- && p < end)
|
||||
{
|
||||
p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
|
||||
GETSHORT (type, p);
|
||||
GETSHORT (qclass, p);
|
||||
GETLONG (ttl, p);
|
||||
GETSHORT (rdlength, p);
|
||||
|
||||
if (type != T_SRV || qclass != C_IN)
|
||||
{
|
||||
p += rdlength;
|
||||
continue;
|
||||
}
|
||||
|
||||
GETSHORT (priority, p);
|
||||
GETSHORT (weight, p);
|
||||
GETSHORT (port, p);
|
||||
p += dn_expand (answer, end, p, namebuf, sizeof (namebuf));
|
||||
|
||||
target = g_srv_target_new (namebuf, port, priority, weight);
|
||||
targets = g_list_prepend (targets, target);
|
||||
}
|
||||
|
||||
return g_srv_target_list_sort (targets);
|
||||
}
|
||||
#elif defined(G_OS_WIN32)
|
||||
/* Private method to process a DnsQuery response into GSrvTargets */
|
||||
GList *
|
||||
_g_resolver_targets_from_DnsQuery (const gchar *rrname,
|
||||
DNS_STATUS status,
|
||||
DNS_RECORD *results,
|
||||
GError **error)
|
||||
{
|
||||
DNS_RECORD *rec;
|
||||
GSrvTarget *target;
|
||||
GList *targets;
|
||||
|
||||
if (status != ERROR_SUCCESS)
|
||||
{
|
||||
GResolverError errnum;
|
||||
const gchar *format;
|
||||
|
||||
if (status == DNS_ERROR_RCODE_NAME_ERROR)
|
||||
{
|
||||
errnum = G_RESOLVER_ERROR_NOT_FOUND;
|
||||
format = _("No service record for '%s'");
|
||||
}
|
||||
else if (status == DNS_ERROR_RCODE_SERVER_FAILURE)
|
||||
{
|
||||
errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE;
|
||||
format = _("Temporarily unable to resolve '%s'");
|
||||
}
|
||||
else
|
||||
{
|
||||
errnum = G_RESOLVER_ERROR_INTERNAL;
|
||||
format = _("Error resolving '%s'");
|
||||
}
|
||||
|
||||
g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
targets = NULL;
|
||||
for (rec = results; rec; rec = rec->pNext)
|
||||
{
|
||||
if (rec->wType != DNS_TYPE_SRV)
|
||||
continue;
|
||||
|
||||
target = g_srv_target_new (rec->Data.SRV.pNameTarget,
|
||||
rec->Data.SRV.wPort,
|
||||
rec->Data.SRV.wPriority,
|
||||
rec->Data.SRV.wWeight);
|
||||
targets = g_list_prepend (targets, target);
|
||||
}
|
||||
|
||||
return g_srv_target_list_sort (targets);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
#define __G_RESOLVER_C__
|
||||
#include "gioaliasdef.c"
|
||||
Reference in New Issue
Block a user