glib/gio/gnetworkservice.c
2009-05-28 00:30:21 -04:00

666 lines
21 KiB
C

/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2008 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 <glib.h>
#include "glibintl.h"
#include "gnetworkservice.h"
#include "gcancellable.h"
#include "ginetaddress.h"
#include "ginetsocketaddress.h"
#include "gresolver.h"
#include "gsimpleasyncresult.h"
#include "gsocketaddressenumerator.h"
#include "gsocketconnectable.h"
#include "gsrvtarget.h"
#include <stdlib.h>
#include <string.h>
#include "gioalias.h"
/**
* SECTION:gnetworkservice
* @short_description: A GSocketConnectable for resolving SRV records
* @include: gio/gio.h
*
* Like #GNetworkAddress does with hostnames, #GNetworkService
* provides an easy way to resolve a SRV record, and then attempt to
* connect to one of the hosts that implements that service, handling
* service priority/weighting, multiple IP addresses, and multiple
* address families.
*
* See #GSrvTarget for more information about SRV records, and see
* #GSocketConnectable for and example of using the connectable
* interface.
*/
/**
* GNetworkService:
*
* A #GSocketConnectable for resolving a SRV record and connecting to
* that service.
*/
struct _GNetworkServicePrivate
{
gchar *service, *protocol, *domain;
GList *targets;
};
enum {
PROP_0,
PROP_SERVICE,
PROP_PROTOCOL,
PROP_DOMAIN,
};
static void g_network_service_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void g_network_service_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void g_network_service_connectable_iface_init (GSocketConnectableIface *iface);
static GSocketAddressEnumerator *g_network_service_connectable_enumerate (GSocketConnectable *connectable);
G_DEFINE_TYPE_WITH_CODE (GNetworkService, g_network_service, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_SOCKET_CONNECTABLE,
g_network_service_connectable_iface_init))
static void
g_network_service_finalize (GObject *object)
{
GNetworkService *srv = G_NETWORK_SERVICE (object);
g_free (srv->priv->service);
g_free (srv->priv->protocol);
g_free (srv->priv->domain);
if (srv->priv->targets)
g_resolver_free_targets (srv->priv->targets);
G_OBJECT_CLASS (g_network_service_parent_class)->finalize (object);
}
static void
g_network_service_class_init (GNetworkServiceClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GNetworkServicePrivate));
gobject_class->set_property = g_network_service_set_property;
gobject_class->get_property = g_network_service_get_property;
gobject_class->finalize = g_network_service_finalize;
g_object_class_install_property (gobject_class, PROP_SERVICE,
g_param_spec_string ("service",
P_("Service"),
P_("Service name, eg \"ldap\""),
NULL,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PROTOCOL,
g_param_spec_string ("protocol",
P_("Protocol"),
P_("Network protocol, eg \"tcp\""),
NULL,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DOMAIN,
g_param_spec_string ("domain",
P_("Domain"),
P_("Network domain, eg, \"example.com\""),
NULL,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
}
static void
g_network_service_connectable_iface_init (GSocketConnectableIface *connectable_iface)
{
connectable_iface->enumerate = g_network_service_connectable_enumerate;
}
static void
g_network_service_init (GNetworkService *srv)
{
srv->priv = G_TYPE_INSTANCE_GET_PRIVATE (srv, G_TYPE_NETWORK_SERVICE,
GNetworkServicePrivate);
}
static void
g_network_service_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GNetworkService *srv = G_NETWORK_SERVICE (object);
switch (prop_id)
{
case PROP_SERVICE:
srv->priv->service = g_value_dup_string (value);
break;
case PROP_PROTOCOL:
srv->priv->protocol = g_value_dup_string (value);
break;
case PROP_DOMAIN:
srv->priv->domain = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_network_service_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GNetworkService *srv = G_NETWORK_SERVICE (object);
switch (prop_id)
{
case PROP_SERVICE:
g_value_set_string (value, g_network_service_get_service (srv));
break;
case PROP_PROTOCOL:
g_value_set_string (value, g_network_service_get_protocol (srv));
break;
case PROP_DOMAIN:
g_value_set_string (value, g_network_service_get_domain (srv));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* g_network_service_new:
* @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
*
* Creates a new #GNetworkService representing the given @service,
* @protocol, and @domain. This will initially be unresolved; use the
* #GSocketConnectable interface to resolve it.
*
* Return value: a new #GNetworkService
*
* Since: 2.22
*/
GSocketConnectable *
g_network_service_new (const gchar *service,
const gchar *protocol,
const gchar *domain)
{
return g_object_new (G_TYPE_NETWORK_SERVICE,
"service", service,
"protocol", protocol,
"domain", domain,
NULL);
}
/**
* g_network_service_get_service:
* @srv: a #GNetworkService
*
* Gets @srv's service name (eg, "ldap").
*
* Return value: @srv's service name
*
* Since: 2.22
*/
const gchar *
g_network_service_get_service (GNetworkService *srv)
{
g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
return srv->priv->service;
}
/**
* g_network_service_get_protocol:
* @srv: a #GNetworkService
*
* Gets @srv's protocol name (eg, "tcp").
*
* Return value: @srv's protocol name
*
* Since: 2.22
*/
const gchar *
g_network_service_get_protocol (GNetworkService *srv)
{
g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
return srv->priv->protocol;
}
/**
* g_network_service_get_domain:
* @srv: a #GNetworkService
*
* Gets the domain that @srv serves. This might be either UTF-8 or
* ASCII-encoded, depending on what @srv was created with.
*
* Return value: @srv's domain name
*
* Since: 2.22
*/
const gchar *
g_network_service_get_domain (GNetworkService *srv)
{
g_return_val_if_fail (G_IS_NETWORK_SERVICE (srv), NULL);
return srv->priv->domain;
}
#define G_TYPE_NETWORK_SERVICE_ADDRESS_ENUMERATOR (_g_network_service_address_enumerator_get_type ())
#define G_NETWORK_SERVICE_ADDRESS_ENUMERATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_NETWORK_SERVICE_ADDRESS_ENUMERATOR, GNetworkServiceAddressEnumerator))
typedef struct {
GSocketAddressEnumerator parent_instance;
GResolver *resolver;
GNetworkService *srv;
GList *addrs, *a, *t;
GError *error;
/* For async operation */
GCancellable *cancellable;
GSimpleAsyncResult *result;
} GNetworkServiceAddressEnumerator;
typedef struct {
GSocketAddressEnumeratorClass parent_class;
} GNetworkServiceAddressEnumeratorClass;
G_DEFINE_TYPE (GNetworkServiceAddressEnumerator, _g_network_service_address_enumerator, G_TYPE_SOCKET_ADDRESS_ENUMERATOR)
static void
g_network_service_address_enumerator_finalize (GObject *object)
{
GNetworkServiceAddressEnumerator *srv_enum =
G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (object);
g_object_unref (srv_enum->srv);
if (srv_enum->addrs)
{
while (srv_enum->a)
{
g_object_unref (srv_enum->a->data);
srv_enum->a = srv_enum->a->next;
}
g_list_free (srv_enum->addrs);
}
g_object_unref (srv_enum->resolver);
if (srv_enum->error)
g_error_free (srv_enum->error);
G_OBJECT_CLASS (_g_network_service_address_enumerator_parent_class)->finalize (object);
}
static GSocketAddress *
g_network_service_address_enumerator_next (GSocketAddressEnumerator *enumerator,
GCancellable *cancellable,
GError **error)
{
GNetworkServiceAddressEnumerator *srv_enum =
G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (enumerator);
GSrvTarget *target;
GSocketAddress *sockaddr;
/* If we haven't yet resolved srv, do that */
if (!srv_enum->srv->priv->targets)
{
GList *targets;
targets = g_resolver_lookup_service (srv_enum->resolver,
srv_enum->srv->priv->service,
srv_enum->srv->priv->protocol,
srv_enum->srv->priv->domain,
cancellable, error);
if (!targets)
return NULL;
if (!srv_enum->srv->priv->targets)
srv_enum->srv->priv->targets = targets;
srv_enum->t = srv_enum->srv->priv->targets;
}
/* Make sure we have a set of resolved addresses for the current
* target. When resolving the first target, we save the GError, if
* any. If any later target succeeds, we'll free the earlier error,
* but if we get to the last target without any of them resolving,
* we return that initial error.
*/
do
{
/* Return if we're out of targets. */
if (!srv_enum->t)
{
if (srv_enum->error)
{
g_propagate_error (error, srv_enum->error);
srv_enum->error = NULL;
}
return NULL;
}
target = srv_enum->t->data;
/* If we haven't resolved the addrs for the current target, do that */
if (!srv_enum->addrs)
{
GError **error_p;
error_p = (srv_enum->t == srv_enum->srv->priv->targets) ? &srv_enum->error : NULL;
srv_enum->addrs = g_resolver_lookup_by_name (srv_enum->resolver,
g_srv_target_get_hostname (target),
cancellable, error_p);
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return NULL;
if (srv_enum->addrs)
{
srv_enum->a = srv_enum->addrs;
if (srv_enum->error)
{
g_error_free (srv_enum->error);
srv_enum->error = NULL;
}
}
else
{
/* Try the next target */
srv_enum->t = srv_enum->t->next;
}
}
}
while (!srv_enum->addrs);
/* Return the next address for this target. If it's the last one,
* advance the target counter.
*/
sockaddr = g_inet_socket_address_new (srv_enum->a->data,
g_srv_target_get_port (target));
g_object_unref (srv_enum->a->data);
srv_enum->a = srv_enum->a->next;
if (!srv_enum->a)
{
g_list_free (srv_enum->addrs);
srv_enum->addrs = NULL;
srv_enum->t = srv_enum->t->next;
}
return sockaddr;
}
static void next_async_resolved_targets (GObject *source_object,
GAsyncResult *result,
gpointer user_data);
static void next_async_have_targets (GNetworkServiceAddressEnumerator *srv_enum);
static void next_async_resolved_addresses (GObject *source_object,
GAsyncResult *result,
gpointer user_data);
static void next_async_have_addresses (GNetworkServiceAddressEnumerator *srv_enum);
/* The async version is basically the same as the sync, except we have
* to split it into multiple functions.
*/
static void
g_network_service_address_enumerator_next_async (GSocketAddressEnumerator *enumerator,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GNetworkServiceAddressEnumerator *srv_enum =
G_NETWORK_SERVICE_ADDRESS_ENUMERATOR (enumerator);
g_return_if_fail (srv_enum->result == NULL);
srv_enum->result = g_simple_async_result_new (G_OBJECT (enumerator),
callback, user_data,
g_network_service_address_enumerator_next_async);
srv_enum->cancellable = cancellable;
/* If we haven't yet resolved srv, do that */
if (!srv_enum->srv->priv->targets)
{
g_resolver_lookup_service_async (srv_enum->resolver,
srv_enum->srv->priv->service,
srv_enum->srv->priv->protocol,
srv_enum->srv->priv->domain,
cancellable,
next_async_resolved_targets,
srv_enum);
}
else
next_async_have_targets (srv_enum);
}
static void
next_async_resolved_targets (GObject *source_object,
GAsyncResult *result,
gpointer user_data)
{
GNetworkServiceAddressEnumerator *srv_enum = user_data;
GList *targets;
GError *error = NULL;
targets = g_resolver_lookup_service_finish (srv_enum->resolver, result, &error);
if (!srv_enum->srv->priv->targets)
{
if (error)
{
GSimpleAsyncResult *simple = srv_enum->result;
srv_enum->result = NULL;
g_simple_async_result_set_from_error (simple, error);
g_error_free (error);
g_simple_async_result_complete (simple);
g_object_unref (simple);
return;
}
srv_enum->srv->priv->targets = targets;
srv_enum->t = srv_enum->srv->priv->targets;
}
next_async_have_targets (srv_enum);
}
static void
next_async_have_targets (GNetworkServiceAddressEnumerator *srv_enum)
{
GSrvTarget *target;
/* Get the current target, check if we're already done. */
if (!srv_enum->t)
{
if (srv_enum->error)
{
g_simple_async_result_set_from_error (srv_enum->result, srv_enum->error);
g_error_free (srv_enum->error);
srv_enum->error = NULL;
}
g_simple_async_result_complete_in_idle (srv_enum->result);
g_object_unref (srv_enum->result);
srv_enum->result = NULL;
return;
}
target = srv_enum->t->data;
/* If we haven't resolved the addrs for the current target, do that */
if (!srv_enum->addrs)
{
g_resolver_lookup_by_name_async (srv_enum->resolver,
g_srv_target_get_hostname (target),
srv_enum->cancellable,
next_async_resolved_addresses,
srv_enum);
}
else
next_async_have_addresses (srv_enum);
}
static void
next_async_resolved_addresses (GObject *source_object,
GAsyncResult *result,
gpointer user_data)
{
GNetworkServiceAddressEnumerator *srv_enum = user_data;
GError *error = NULL;
srv_enum->addrs = g_resolver_lookup_by_name_finish (srv_enum->resolver, result, &error);
if (srv_enum->addrs)
{
srv_enum->a = srv_enum->addrs;
if (srv_enum->error)
{
g_error_free (srv_enum->error);
srv_enum->error = NULL;
}
next_async_have_addresses (srv_enum);
}
else
{
if (g_cancellable_is_cancelled (srv_enum->cancellable))
{
GSimpleAsyncResult *simple = srv_enum->result;
srv_enum->result = NULL;
g_simple_async_result_set_from_error (srv_enum->result, error);
g_error_free (error);
g_simple_async_result_complete (simple);
g_object_unref (simple);
}
else
{
if (srv_enum->t == srv_enum->srv->priv->targets)
srv_enum->error = error;
else
g_error_free (error);
/* Try the next target */
srv_enum->t = srv_enum->t->next;
next_async_have_targets (srv_enum);
}
}
}
static void
next_async_have_addresses (GNetworkServiceAddressEnumerator *srv_enum)
{
GSocketAddress *sockaddr;
GSimpleAsyncResult *simple = srv_enum->result;
/* Return the next address for this target. If it's the last one,
* advance the target counter.
*/
sockaddr = g_inet_socket_address_new (srv_enum->a->data,
g_srv_target_get_port (srv_enum->t->data));
g_object_unref (srv_enum->a->data);
srv_enum->a = srv_enum->a->next;
if (!srv_enum->a)
{
g_list_free (srv_enum->addrs);
srv_enum->addrs = NULL;
srv_enum->t = srv_enum->t->next;
}
srv_enum->result = NULL;
g_simple_async_result_set_op_res_gpointer (simple, sockaddr, NULL);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
static GSocketAddress *
g_network_service_address_enumerator_next_finish (GSocketAddressEnumerator *enumerator,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
GSocketAddress *sockaddr;
if (g_simple_async_result_propagate_error (simple, error))
return NULL;
sockaddr = g_simple_async_result_get_op_res_gpointer (simple);
return sockaddr ? g_object_ref (sockaddr) : NULL;
}
static void
_g_network_service_address_enumerator_init (GNetworkServiceAddressEnumerator *enumerator)
{
}
static void
_g_network_service_address_enumerator_class_init (GNetworkServiceAddressEnumeratorClass *addrenum_class)
{
GObjectClass *object_class = G_OBJECT_CLASS (addrenum_class);
GSocketAddressEnumeratorClass *enumerator_class =
G_SOCKET_ADDRESS_ENUMERATOR_CLASS (addrenum_class);
enumerator_class->next = g_network_service_address_enumerator_next;
enumerator_class->next_async = g_network_service_address_enumerator_next_async;
enumerator_class->next_finish = g_network_service_address_enumerator_next_finish;
object_class->finalize = g_network_service_address_enumerator_finalize;
}
static GSocketAddressEnumerator *
g_network_service_connectable_enumerate (GSocketConnectable *connectable)
{
GNetworkServiceAddressEnumerator *srv_enum;
srv_enum = g_object_new (G_TYPE_NETWORK_SERVICE_ADDRESS_ENUMERATOR, NULL);
srv_enum->srv = g_object_ref (connectable);
srv_enum->resolver = g_resolver_get_default ();
return (GSocketAddressEnumerator *)srv_enum;
}
#define __G_NETWORK_SERVICE_C__
#include "gioaliasdef.c"