glib/gio/gnetworkaddress.c

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/* -*- 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 <stdlib.h>
#include "gnetworkaddress.h"
#include "gasyncresult.h"
#include "ginetaddress.h"
#include "ginetsocketaddress.h"
#include "gnetworkingprivate.h"
#include "gresolver.h"
#include "gsimpleasyncresult.h"
#include "gsocketaddressenumerator.h"
#include "gioerror.h"
#include "gsocketconnectable.h"
#include <string.h>
#include "gioalias.h"
/**
* SECTION:gnetworkaddress
2009-05-28 06:30:21 +02:00
* @short_description: A GSocketConnectable for resolving hostnames
* @include: gio/gio.h
*
* #GNetworkAddress provides an easy way to resolve a hostname and
* then attempt to connect to that host, handling the possibility of
* multiple IP addresses and multiple address families.
*
* See #GSocketConnectable for and example of using the connectable
* interface.
*/
/**
* GNetworkAddress:
*
* A #GSocketConnectable for resolving a hostname and connecting to
* that host.
*/
struct _GNetworkAddressPrivate {
gchar *hostname;
guint16 port;
GList *sockaddrs;
};
enum {
PROP_0,
PROP_HOSTNAME,
PROP_PORT,
};
static void g_network_address_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void g_network_address_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void g_network_address_connectable_iface_init (GSocketConnectableIface *iface);
static GSocketAddressEnumerator *g_network_address_connectable_enumerate (GSocketConnectable *connectable);
G_DEFINE_TYPE_WITH_CODE (GNetworkAddress, g_network_address, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_SOCKET_CONNECTABLE,
g_network_address_connectable_iface_init))
static void
g_network_address_finalize (GObject *object)
{
GNetworkAddress *addr = G_NETWORK_ADDRESS (object);
g_free (addr->priv->hostname);
if (addr->priv->sockaddrs)
{
GList *a;
for (a = addr->priv->sockaddrs; a; a = a->next)
g_object_unref (a->data);
g_list_free (addr->priv->sockaddrs);
}
G_OBJECT_CLASS (g_network_address_parent_class)->finalize (object);
}
static void
g_network_address_class_init (GNetworkAddressClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GNetworkAddressPrivate));
gobject_class->set_property = g_network_address_set_property;
gobject_class->get_property = g_network_address_get_property;
gobject_class->finalize = g_network_address_finalize;
g_object_class_install_property (gobject_class, PROP_HOSTNAME,
g_param_spec_string ("hostname",
P_("Hostname"),
P_("Hostname to resolve"),
NULL,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PORT,
g_param_spec_uint ("port",
P_("Port"),
P_("Network port"),
0, 65535, 0,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
}
static void
g_network_address_connectable_iface_init (GSocketConnectableIface *connectable_iface)
{
connectable_iface->enumerate = g_network_address_connectable_enumerate;
}
static void
g_network_address_init (GNetworkAddress *addr)
{
addr->priv = G_TYPE_INSTANCE_GET_PRIVATE (addr, G_TYPE_NETWORK_ADDRESS,
GNetworkAddressPrivate);
}
static void
g_network_address_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GNetworkAddress *addr = G_NETWORK_ADDRESS (object);
switch (prop_id)
{
case PROP_HOSTNAME:
if (addr->priv->hostname)
g_free (addr->priv->hostname);
addr->priv->hostname = g_value_dup_string (value);
break;
case PROP_PORT:
addr->priv->port = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_network_address_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GNetworkAddress *addr = G_NETWORK_ADDRESS (object);
switch (prop_id)
{
case PROP_HOSTNAME:
g_value_set_string (value, addr->priv->hostname);
break;
case PROP_PORT:
g_value_set_uint (value, addr->priv->port);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_network_address_set_addresses (GNetworkAddress *addr,
GList *addresses)
{
GList *a;
GSocketAddress *sockaddr;
g_return_if_fail (addresses != NULL && addr->priv->sockaddrs == NULL);
for (a = addresses; a; a = a->next)
{
sockaddr = g_inet_socket_address_new (a->data, addr->priv->port);
addr->priv->sockaddrs = g_list_prepend (addr->priv->sockaddrs, sockaddr);
g_object_unref (a->data);
}
g_list_free (addresses);
addr->priv->sockaddrs = g_list_reverse (addr->priv->sockaddrs);
}
/**
* g_network_address_new:
* @hostname: the hostname
* @port: the port
*
* Creates a new #GSocketConnectable for connecting to the given
* @hostname and @port.
*
* Return value: the new #GNetworkAddress
*
* Since: 2.22
*/
GSocketConnectable *
g_network_address_new (const gchar *hostname,
guint16 port)
{
return g_object_new (G_TYPE_NETWORK_ADDRESS,
"hostname", hostname,
"port", port,
NULL);
}
/**
* g_network_address_parse:
* @host_and_port: the hostname and optionally a port
* @default_port: the default port if not in @host_and_port
* @error: a pointer to a #GError, or %NULL
*
* Creates a new #GSocketConnectable for connecting to the given
* @hostname and @port. May fail and return %NULL in case
* parsing @host_and_port fails.
*
* @host_and_port may be in any of a number of recognised formats: an IPv6
* address, an IPv4 address, or a domain name (in which case a DNS
* lookup is performed). Quoting with [] is supported for all address
* types. A port override may be specified in the usual way with a
* colon. Ports may be given as decimal numbers or symbolic names (in
* which case an /etc/services lookup is performed).
*
* If no port is specified in @host_and_port then @default_port will be
* used as the port number to connect to.
*
* In general, @host_and_port is expected to be provided by the user
* (allowing them to give the hostname, and a port overide if necessary)
* and @default_port is expected to be provided by the application.
*
* Return value: the new #GNetworkAddress, or %NULL on error
*
* Since: 2.22
*/
GSocketConnectable *
g_network_address_parse (const gchar *host_and_port,
guint16 default_port,
GError **error)
{
GSocketConnectable *connectable;
const gchar *port;
guint16 portnum;
gchar *name;
g_return_val_if_fail (host_and_port != NULL, NULL);
port = NULL;
if (host_and_port[0] == '[')
/* escaped host part (to allow, eg. "[2001:db8::1]:888") */
{
const gchar *end;
end = strchr (host_and_port, ']');
if (end == NULL)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
_("Hostname '%s' contains '[' but not ']'"), host_and_port);
return NULL;
}
if (end[1] == '\0')
port = NULL;
else if (end[1] == ':')
port = &end[2];
else
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
"The ']' character (in hostname '%s') must come at the"
" end or be immediately followed by ':' and a port",
host_and_port);
return NULL;
}
name = g_strndup (host_and_port + 1, end - host_and_port - 1);
}
else if ((port = strchr (host_and_port, ':')))
/* string has a ':' in it */
{
/* skip ':' */
port++;
if (strchr (port, ':'))
/* more than one ':' in string */
{
/* this is actually an unescaped IPv6 address */
name = g_strdup (host_and_port);
port = NULL;
}
else
name = g_strndup (host_and_port, port - host_and_port - 1);
}
else
/* plain hostname, no port */
name = g_strdup (host_and_port);
if (port != NULL)
{
if (port[0] == '\0')
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
"If a ':' character is given, it must be followed by a "
"port (in hostname '%s').", host_and_port);
g_free (name);
return NULL;
}
else if ('0' <= port[0] && port[0] <= '9')
{
char *end;
long value;
value = strtol (port, &end, 10);
if (*end != '\0' || value < 0 || value > G_MAXUINT16)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
"Invalid numeric port '%s' specified in hostname '%s'",
port, host_and_port);
g_free (name);
return NULL;
}
portnum = value;
}
else
{
struct servent *entry;
entry = getservbyname (port, "tcp");
if (entry == NULL)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
"Unknown service '%s' specified in hostname '%s'",
port, host_and_port);
#ifdef HAVE_ENDSERVENT
endservent ();
#endif
g_free (name);
return NULL;
}
portnum = g_ntohs (entry->s_port);
#ifdef HAVE_ENDSERVENT
endservent ();
#endif
}
}
else
{
/* No port in host_and_port */
portnum = default_port;
}
connectable = g_network_address_new (name, portnum);
g_free (name);
return connectable;
}
/**
* g_network_address_get_hostname:
* @addr: a #GNetworkAddress
*
* Gets @addr's hostname. This might be either UTF-8 or ASCII-encoded,
* depending on what @addr was created with.
*
* Return value: @addr's hostname
*
* Since: 2.22
*/
const gchar *
g_network_address_get_hostname (GNetworkAddress *addr)
{
g_return_val_if_fail (G_IS_NETWORK_ADDRESS (addr), NULL);
return addr->priv->hostname;
}
/**
* g_network_address_get_port:
* @addr: a #GNetworkAddress
*
* Gets @addr's port number
*
* Return value: @addr's port (which may be 0)
*
* Since: 2.22
*/
guint16
g_network_address_get_port (GNetworkAddress *addr)
{
g_return_val_if_fail (G_IS_NETWORK_ADDRESS (addr), 0);
return addr->priv->port;
}
#define G_TYPE_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (_g_network_address_address_enumerator_get_type ())
#define G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_NETWORK_ADDRESS_ADDRESS_ENUMERATOR, GNetworkAddressAddressEnumerator))
typedef struct {
GSocketAddressEnumerator parent_instance;
GNetworkAddress *addr;
GList *a;
} GNetworkAddressAddressEnumerator;
typedef struct {
GSocketAddressEnumeratorClass parent_class;
} GNetworkAddressAddressEnumeratorClass;
G_DEFINE_TYPE (GNetworkAddressAddressEnumerator, _g_network_address_address_enumerator, G_TYPE_SOCKET_ADDRESS_ENUMERATOR)
static void
g_network_address_address_enumerator_finalize (GObject *object)
{
GNetworkAddressAddressEnumerator *addr_enum =
G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (object);
g_object_unref (addr_enum->addr);
G_OBJECT_CLASS (_g_network_address_address_enumerator_parent_class)->finalize (object);
}
static GSocketAddress *
g_network_address_address_enumerator_next (GSocketAddressEnumerator *enumerator,
GCancellable *cancellable,
GError **error)
{
GNetworkAddressAddressEnumerator *addr_enum =
G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (enumerator);
GSocketAddress *sockaddr;
if (!addr_enum->addr->priv->sockaddrs)
{
GResolver *resolver = g_resolver_get_default ();
GList *addresses;
addresses = g_resolver_lookup_by_name (resolver,
addr_enum->addr->priv->hostname,
cancellable, error);
g_object_unref (resolver);
if (!addresses)
return NULL;
g_network_address_set_addresses (addr_enum->addr, addresses);
addr_enum->a = addr_enum->addr->priv->sockaddrs;
}
if (!addr_enum->a)
return NULL;
else
{
sockaddr = addr_enum->a->data;
addr_enum->a = addr_enum->a->next;
return g_object_ref (sockaddr);
}
}
static void
got_addresses (GObject *source_object,
GAsyncResult *result,
gpointer user_data)
{
GSimpleAsyncResult *simple = user_data;
GNetworkAddressAddressEnumerator *addr_enum =
g_simple_async_result_get_op_res_gpointer (simple);
GResolver *resolver = G_RESOLVER (source_object);
GList *addresses;
GError *error = NULL;
addresses = g_resolver_lookup_by_name_finish (resolver, result, &error);
if (!addr_enum->addr->priv->sockaddrs)
{
if (error)
{
g_simple_async_result_set_from_error (simple, error);
g_error_free (error);
}
else
{
g_network_address_set_addresses (addr_enum->addr, addresses);
addr_enum->a = addr_enum->addr->priv->sockaddrs;
}
}
else if (error)
g_error_free (error);
g_object_unref (resolver);
g_simple_async_result_complete (simple);
g_object_unref (simple);
}
static void
g_network_address_address_enumerator_next_async (GSocketAddressEnumerator *enumerator,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GNetworkAddressAddressEnumerator *addr_enum =
G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (enumerator);
GSimpleAsyncResult *simple;
GSocketAddress *sockaddr;
simple = g_simple_async_result_new (G_OBJECT (enumerator),
callback, user_data,
g_network_address_address_enumerator_next_async);
if (!addr_enum->addr->priv->sockaddrs)
{
GResolver *resolver = g_resolver_get_default ();
g_simple_async_result_set_op_res_gpointer (simple, g_object_ref (addr_enum), g_object_unref);
g_resolver_lookup_by_name_async (resolver,
addr_enum->addr->priv->hostname,
cancellable,
got_addresses, simple);
}
else
{
sockaddr = g_network_address_address_enumerator_next (enumerator, NULL, NULL);
if (sockaddr)
g_simple_async_result_set_op_res_gpointer (simple, sockaddr, g_object_unref);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
}
static GSocketAddress *
g_network_address_address_enumerator_next_finish (GSocketAddressEnumerator *enumerator,
GAsyncResult *result,
GError **error)
{
GNetworkAddressAddressEnumerator *addr_enum =
G_NETWORK_ADDRESS_ADDRESS_ENUMERATOR (enumerator);
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
GSocketAddress *sockaddr;
if (g_simple_async_result_propagate_error (simple, error))
return NULL;
else if (!addr_enum->a)
return NULL;
else
{
sockaddr = addr_enum->a->data;
addr_enum->a = addr_enum->a->next;
return g_object_ref (sockaddr);
}
}
static void
_g_network_address_address_enumerator_init (GNetworkAddressAddressEnumerator *enumerator)
{
}
static void
_g_network_address_address_enumerator_class_init (GNetworkAddressAddressEnumeratorClass *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_address_address_enumerator_next;
enumerator_class->next_async = g_network_address_address_enumerator_next_async;
enumerator_class->next_finish = g_network_address_address_enumerator_next_finish;
object_class->finalize = g_network_address_address_enumerator_finalize;
}
static GSocketAddressEnumerator *
g_network_address_connectable_enumerate (GSocketConnectable *connectable)
{
GNetworkAddressAddressEnumerator *addr_enum;
addr_enum = g_object_new (G_TYPE_NETWORK_ADDRESS_ADDRESS_ENUMERATOR, NULL);
addr_enum->addr = g_object_ref (connectable);
return (GSocketAddressEnumerator *)addr_enum;
}
#define __G_NETWORK_ADDRESS_C__
#include "gioaliasdef.c"