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glib/gio/gsocks4aproxy.c
Dan Winship eb45a590fa gsocks5proxy, gsocks4aproxy: simplify some error messages 
There's no need to include the exact max length in the error messages,
and it makes it look like the strings need to use ngettext() if you do.

https://bugzilla.gnome.org/show_bug.cgi?id=658206
2011-09-18 10:49:58 -04:00

491 lines
12 KiB
C
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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2010 Collabora, Ltd.
*
* 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.
*
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
*/
#include "config.h"
#include "gsocks4aproxy.h"
#include <string.h>
#include "gasyncresult.h"
#include "giomodule.h"
#include "giomodule-priv.h"
#include "giostream.h"
#include "ginetaddress.h"
#include "ginputstream.h"
#include "glibintl.h"
#include "goutputstream.h"
#include "gproxy.h"
#include "gproxyaddress.h"
#include "gsimpleasyncresult.h"
#define SOCKS4_VERSION 4
#define SOCKS4_CMD_CONNECT 1
#define SOCKS4_CMD_BIND 2
#define SOCKS4_MAX_LEN 255
#define SOCKS4_REP_VERSION 0
#define SOCKS4_REP_GRANTED 90
#define SOCKS4_REP_REJECTED 91
#define SOCKS4_REP_NO_IDENT 92
#define SOCKS4_REP_BAD_IDENT 93
static void g_socks4a_proxy_iface_init (GProxyInterface *proxy_iface);
#define g_socks4a_proxy_get_type _g_socks4a_proxy_get_type
G_DEFINE_TYPE_WITH_CODE (GSocks4aProxy, g_socks4a_proxy, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_PROXY,
g_socks4a_proxy_iface_init)
_g_io_modules_ensure_extension_points_registered ();
g_io_extension_point_implement (G_PROXY_EXTENSION_POINT_NAME,
g_define_type_id,
"socks4a",
0))
static void
g_socks4a_proxy_finalize (GObject *object)
{
/* must chain up */
G_OBJECT_CLASS (g_socks4a_proxy_parent_class)->finalize (object);
}
static void
g_socks4a_proxy_init (GSocks4aProxy *proxy)
{
proxy->supports_hostname = TRUE;
}
/* |-> SOCKSv4a only
* +----+----+----+----+----+----+----+----+----+----+....+----+------+....+------+
* | VN | CD | DSTPORT | DSTIP | USERID |NULL| HOST | | NULL |
* +----+----+----+----+----+----+----+----+----+----+....+----+------+....+------+
* 1 1 2 4 variable 1 variable
*/
#define SOCKS4_CONN_MSG_LEN (9 + SOCKS4_MAX_LEN * 2)
static gint
set_connect_msg (guint8 *msg,
const gchar *hostname,
guint16 port,
const char *username,
GError **error)
{
GInetAddress *addr;
guint len = 0;
gsize addr_len;
gboolean is_ip;
const gchar *ip;
msg[len++] = SOCKS4_VERSION;
msg[len++] = SOCKS4_CMD_CONNECT;
{
guint16 hp = g_htons (port);
memcpy (msg + len, &hp, 2);
len += 2;
}
is_ip = g_hostname_is_ip_address (hostname);
if (is_ip)
ip = hostname;
else
ip = "0.0.0.1";
addr = g_inet_address_new_from_string (ip);
addr_len = g_inet_address_get_native_size (addr);
if (addr_len != 4)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("SOCKSv4 does not support IPv6 address '%s'"),
ip);
g_object_unref (addr);
return -1;
}
memcpy (msg + len, g_inet_address_to_bytes (addr), addr_len);
len += addr_len;
g_object_unref (addr);
if (username)
{
gsize user_len = strlen (username);
if (user_len > SOCKS4_MAX_LEN)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("Username is too long for SOCKSv4 protocol"));
return -1;
}
memcpy (msg + len, username, user_len);
len += user_len;
}
msg[len++] = '\0';
if (!is_ip)
{
gsize host_len = strlen (hostname);
if (host_len > SOCKS4_MAX_LEN)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("Hostname '%s' is too long for SOCKSv4 protocol"),
hostname);
return -1;
}
memcpy (msg + len, hostname, host_len);
len += host_len;
msg[len++] = '\0';
}
return len;
}
/*
* +----+----+----+----+----+----+----+----+
* | VN | CD | DSTPORT | DSTIP |
* +----+----+----+----+----+----+----+----+
* 1 1 2 4
*/
#define SOCKS4_CONN_REP_LEN 8
static gboolean
parse_connect_reply (const guint8 *data, GError **error)
{
if (data[0] != SOCKS4_REP_VERSION)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("The server is not a SOCKSv4 proxy server."));
return FALSE;
}
if (data[1] != SOCKS4_REP_GRANTED)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
_("Connection through SOCKSv4 server was rejected"));
return FALSE;
}
return TRUE;
}
static GIOStream *
g_socks4a_proxy_connect (GProxy *proxy,
GIOStream *io_stream,
GProxyAddress *proxy_address,
GCancellable *cancellable,
GError **error)
{
GInputStream *in;
GOutputStream *out;
const gchar *hostname;
guint16 port;
const gchar *username;
hostname = g_proxy_address_get_destination_hostname (proxy_address);
port = g_proxy_address_get_destination_port (proxy_address);
username = g_proxy_address_get_username (proxy_address);
in = g_io_stream_get_input_stream (io_stream);
out = g_io_stream_get_output_stream (io_stream);
/* Send SOCKS4 connection request */
{
guint8 msg[SOCKS4_CONN_MSG_LEN];
gint len;
len = set_connect_msg (msg, hostname, port, username, error);
if (len < 0)
goto error;
if (!g_output_stream_write_all (out, msg, len, NULL,
cancellable, error))
goto error;
}
/* Read SOCKS4 response */
{
guint8 data[SOCKS4_CONN_REP_LEN];
if (!g_input_stream_read_all (in, data, SOCKS4_CONN_REP_LEN, NULL,
cancellable, error))
goto error;
if (!parse_connect_reply (data, error))
goto error;
}
return g_object_ref (io_stream);
error:
return NULL;
}
typedef struct
{
GSimpleAsyncResult *simple;
GIOStream *io_stream;
GProxyAddress *proxy_address;
GCancellable *cancellable;
/* For connecting */
guint8 *buffer;
gssize length;
gssize offset;
} ConnectAsyncData;
static void connect_msg_write_cb (GObject *source,
GAsyncResult *result,
gpointer user_data);
static void connect_reply_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data);
static void
free_connect_data (ConnectAsyncData *data)
{
if (data->io_stream)
g_object_unref (data->io_stream);
if (data->proxy_address)
g_object_unref (data->proxy_address);
if (data->cancellable)
g_object_unref (data->cancellable);
g_slice_free (ConnectAsyncData, data);
}
static void
complete_async_from_error (ConnectAsyncData *data, GError *error)
{
GSimpleAsyncResult *simple = data->simple;
g_simple_async_result_take_error (data->simple, error);
g_simple_async_result_set_op_res_gpointer (simple, NULL, NULL);
g_simple_async_result_complete (simple);
g_object_unref (simple);
}
static void
do_read (GAsyncReadyCallback callback, ConnectAsyncData *data)
{
GInputStream *in;
in = g_io_stream_get_input_stream (data->io_stream);
g_input_stream_read_async (in,
data->buffer + data->offset,
data->length - data->offset,
G_PRIORITY_DEFAULT, data->cancellable,
callback, data);
}
static void
do_write (GAsyncReadyCallback callback, ConnectAsyncData *data)
{
GOutputStream *out;
out = g_io_stream_get_output_stream (data->io_stream);
g_output_stream_write_async (out,
data->buffer + data->offset,
data->length - data->offset,
G_PRIORITY_DEFAULT, data->cancellable,
callback, data);
}
static void
g_socks4a_proxy_connect_async (GProxy *proxy,
GIOStream *io_stream,
GProxyAddress *proxy_address,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GError *error = NULL;
GSimpleAsyncResult *simple;
ConnectAsyncData *data;
const gchar *hostname;
guint16 port;
const gchar *username;
simple = g_simple_async_result_new (G_OBJECT (proxy),
callback, user_data,
g_socks4a_proxy_connect_async);
data = g_slice_new0 (ConnectAsyncData);
data->simple = simple;
data->io_stream = g_object_ref (io_stream);
if (cancellable)
data->cancellable = g_object_ref (cancellable);
g_simple_async_result_set_op_res_gpointer (simple, data,
(GDestroyNotify) free_connect_data);
hostname = g_proxy_address_get_destination_hostname (proxy_address);
port = g_proxy_address_get_destination_port (proxy_address);
username = g_proxy_address_get_username (proxy_address);
data->buffer = g_malloc0 (SOCKS4_CONN_MSG_LEN);
data->length = set_connect_msg (data->buffer,
hostname, port, username,
&error);
data->offset = 0;
if (data->length < 0)
{
g_simple_async_result_take_error (data->simple, error);
g_simple_async_result_set_op_res_gpointer (simple, NULL, NULL);
g_simple_async_result_complete_in_idle (simple);
g_object_unref (simple);
}
else
{
do_write (connect_msg_write_cb, data);
}
}
static void
connect_msg_write_cb (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GError *error = NULL;
ConnectAsyncData *data = user_data;
gssize written;
written = g_output_stream_write_finish (G_OUTPUT_STREAM (source),
result, &error);
if (written < 0)
{
complete_async_from_error (data, error);
return;
}
data->offset += written;
if (data->offset == data->length)
{
g_free (data->buffer);
data->buffer = g_malloc0 (SOCKS4_CONN_REP_LEN);
data->length = SOCKS4_CONN_REP_LEN;
data->offset = 0;
do_read (connect_reply_read_cb, data);
}
else
{
do_write (connect_msg_write_cb, data);
}
}
static void
connect_reply_read_cb (GObject *source,
GAsyncResult *result,
gpointer user_data)
{
GError *error = NULL;
ConnectAsyncData *data = user_data;
gssize read;
read = g_input_stream_read_finish (G_INPUT_STREAM (source),
result, &error);
if (read < 0)
{
complete_async_from_error (data, error);
return;
}
data->offset += read;
if (data->offset == data->length)
{
if (!parse_connect_reply (data->buffer, &error))
{
complete_async_from_error (data, error);
}
else
{
GSimpleAsyncResult *simple = data->simple;
g_simple_async_result_complete (simple);
g_object_unref (simple);
}
}
else
{
do_read (connect_reply_read_cb, data);
}
}
static GIOStream *g_socks4a_proxy_connect_finish (GProxy *proxy,
GAsyncResult *result,
GError **error);
static GIOStream *
g_socks4a_proxy_connect_finish (GProxy *proxy,
GAsyncResult *result,
GError **error)
{
GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
ConnectAsyncData *data = g_simple_async_result_get_op_res_gpointer (simple);
if (g_simple_async_result_propagate_error (simple, error))
return NULL;
return g_object_ref (data->io_stream);
}
static gboolean
g_socks4a_proxy_supports_hostname (GProxy *proxy)
{
return G_SOCKS4A_PROXY (proxy)->supports_hostname;
}
static void
g_socks4a_proxy_class_init (GSocks4aProxyClass *class)
{
GObjectClass *object_class;
object_class = (GObjectClass *) class;
object_class->finalize = g_socks4a_proxy_finalize;
}
static void
g_socks4a_proxy_iface_init (GProxyInterface *proxy_iface)
{
proxy_iface->connect = g_socks4a_proxy_connect;
proxy_iface->connect_async = g_socks4a_proxy_connect_async;
proxy_iface->connect_finish = g_socks4a_proxy_connect_finish;
proxy_iface->supports_hostname = g_socks4a_proxy_supports_hostname;
}
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