1 /* GIO - GLib Input, Output and Streaming Library
3 * Copyright (C) 2010 Collabora, Ltd.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General
16 * Public License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
18 * Boston, MA 02111-1307, USA.
20 * Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
25 #include "gsocks4aproxy.h"
29 #include "giomodule.h"
30 #include "giomodule-priv.h"
31 #include "giostream.h"
32 #include "ginetaddress.h"
33 #include "ginputstream.h"
35 #include "goutputstream.h"
37 #include "gproxyaddress.h"
40 #define SOCKS4_VERSION 4
42 #define SOCKS4_CMD_CONNECT 1
43 #define SOCKS4_CMD_BIND 2
45 #define SOCKS4_MAX_LEN 255
47 #define SOCKS4_REP_VERSION 0
48 #define SOCKS4_REP_GRANTED 90
49 #define SOCKS4_REP_REJECTED 91
50 #define SOCKS4_REP_NO_IDENT 92
51 #define SOCKS4_REP_BAD_IDENT 93
53 static void g_socks4a_proxy_iface_init (GProxyInterface
*proxy_iface
);
55 #define g_socks4a_proxy_get_type _g_socks4a_proxy_get_type
56 G_DEFINE_TYPE_WITH_CODE (GSocks4aProxy
, g_socks4a_proxy
, G_TYPE_OBJECT
,
57 G_IMPLEMENT_INTERFACE (G_TYPE_PROXY
,
58 g_socks4a_proxy_iface_init
)
59 _g_io_modules_ensure_extension_points_registered ();
60 g_io_extension_point_implement (G_PROXY_EXTENSION_POINT_NAME
,
66 g_socks4a_proxy_finalize (GObject
*object
)
69 G_OBJECT_CLASS (g_socks4a_proxy_parent_class
)->finalize (object
);
73 g_socks4a_proxy_init (GSocks4aProxy
*proxy
)
75 proxy
->supports_hostname
= TRUE
;
79 * +----+----+----+----+----+----+----+----+----+----+....+----+------+....+------+
80 * | VN | CD | DSTPORT | DSTIP | USERID |NULL| HOST | | NULL |
81 * +----+----+----+----+----+----+----+----+----+----+....+----+------+....+------+
82 * 1 1 2 4 variable 1 variable
84 #define SOCKS4_CONN_MSG_LEN (9 + SOCKS4_MAX_LEN * 2)
86 set_connect_msg (guint8
*msg
,
87 const gchar
*hostname
,
98 msg
[len
++] = SOCKS4_VERSION
;
99 msg
[len
++] = SOCKS4_CMD_CONNECT
;
102 guint16 hp
= g_htons (port
);
103 memcpy (msg
+ len
, &hp
, 2);
107 is_ip
= g_hostname_is_ip_address (hostname
);
114 addr
= g_inet_address_new_from_string (ip
);
115 addr_len
= g_inet_address_get_native_size (addr
);
119 g_set_error (error
, G_IO_ERROR
, G_IO_ERROR_PROXY_FAILED
,
120 _("SOCKSv4 does not support IPv6 address '%s'"),
122 g_object_unref (addr
);
126 memcpy (msg
+ len
, g_inet_address_to_bytes (addr
), addr_len
);
129 g_object_unref (addr
);
133 gsize user_len
= strlen (username
);
135 if (user_len
> SOCKS4_MAX_LEN
)
137 g_set_error_literal (error
, G_IO_ERROR
, G_IO_ERROR_PROXY_FAILED
,
138 _("Username is too long for SOCKSv4 protocol"));
142 memcpy (msg
+ len
, username
, user_len
);
150 gsize host_len
= strlen (hostname
);
152 if (host_len
> SOCKS4_MAX_LEN
)
154 g_set_error (error
, G_IO_ERROR
, G_IO_ERROR_PROXY_FAILED
,
155 _("Hostname '%s' is too long for SOCKSv4 protocol"),
160 memcpy (msg
+ len
, hostname
, host_len
);
169 * +----+----+----+----+----+----+----+----+
170 * | VN | CD | DSTPORT | DSTIP |
171 * +----+----+----+----+----+----+----+----+
174 #define SOCKS4_CONN_REP_LEN 8
176 parse_connect_reply (const guint8
*data
, GError
**error
)
178 if (data
[0] != SOCKS4_REP_VERSION
)
180 g_set_error_literal (error
, G_IO_ERROR
, G_IO_ERROR_PROXY_FAILED
,
181 _("The server is not a SOCKSv4 proxy server."));
185 if (data
[1] != SOCKS4_REP_GRANTED
)
187 g_set_error_literal (error
, G_IO_ERROR
, G_IO_ERROR_PROXY_FAILED
,
188 _("Connection through SOCKSv4 server was rejected"));
196 g_socks4a_proxy_connect (GProxy
*proxy
,
197 GIOStream
*io_stream
,
198 GProxyAddress
*proxy_address
,
199 GCancellable
*cancellable
,
204 const gchar
*hostname
;
206 const gchar
*username
;
208 hostname
= g_proxy_address_get_destination_hostname (proxy_address
);
209 port
= g_proxy_address_get_destination_port (proxy_address
);
210 username
= g_proxy_address_get_username (proxy_address
);
212 in
= g_io_stream_get_input_stream (io_stream
);
213 out
= g_io_stream_get_output_stream (io_stream
);
215 /* Send SOCKS4 connection request */
217 guint8 msg
[SOCKS4_CONN_MSG_LEN
];
220 len
= set_connect_msg (msg
, hostname
, port
, username
, error
);
225 if (!g_output_stream_write_all (out
, msg
, len
, NULL
,
230 /* Read SOCKS4 response */
232 guint8 data
[SOCKS4_CONN_REP_LEN
];
234 if (!g_input_stream_read_all (in
, data
, SOCKS4_CONN_REP_LEN
, NULL
,
238 if (!parse_connect_reply (data
, error
))
242 return g_object_ref (io_stream
);
251 GIOStream
*io_stream
;
260 static void connect_msg_write_cb (GObject
*source
,
261 GAsyncResult
*result
,
263 static void connect_reply_read_cb (GObject
*source
,
264 GAsyncResult
*result
,
268 free_connect_data (ConnectAsyncData
*data
)
270 g_object_unref (data
->io_stream
);
271 g_slice_free (ConnectAsyncData
, data
);
275 do_read (GAsyncReadyCallback callback
, GTask
*task
, ConnectAsyncData
*data
)
278 in
= g_io_stream_get_input_stream (data
->io_stream
);
279 g_input_stream_read_async (in
,
280 data
->buffer
+ data
->offset
,
281 data
->length
- data
->offset
,
282 g_task_get_priority (task
),
283 g_task_get_cancellable (task
),
288 do_write (GAsyncReadyCallback callback
, GTask
*task
, ConnectAsyncData
*data
)
291 out
= g_io_stream_get_output_stream (data
->io_stream
);
292 g_output_stream_write_async (out
,
293 data
->buffer
+ data
->offset
,
294 data
->length
- data
->offset
,
295 g_task_get_priority (task
),
296 g_task_get_cancellable (task
),
303 g_socks4a_proxy_connect_async (GProxy
*proxy
,
304 GIOStream
*io_stream
,
305 GProxyAddress
*proxy_address
,
306 GCancellable
*cancellable
,
307 GAsyncReadyCallback callback
,
310 GError
*error
= NULL
;
312 ConnectAsyncData
*data
;
313 const gchar
*hostname
;
315 const gchar
*username
;
317 data
= g_slice_new0 (ConnectAsyncData
);
318 data
->io_stream
= g_object_ref (io_stream
);
320 task
= g_task_new (proxy
, cancellable
, callback
, user_data
);
321 g_task_set_task_data (task
, data
, (GDestroyNotify
) free_connect_data
);
323 hostname
= g_proxy_address_get_destination_hostname (proxy_address
);
324 port
= g_proxy_address_get_destination_port (proxy_address
);
325 username
= g_proxy_address_get_username (proxy_address
);
327 data
->buffer
= g_malloc0 (SOCKS4_CONN_MSG_LEN
);
328 data
->length
= set_connect_msg (data
->buffer
,
329 hostname
, port
, username
,
333 if (data
->length
< 0)
335 g_task_return_error (task
, error
);
336 g_object_unref (task
);
340 do_write (connect_msg_write_cb
, task
, data
);
345 connect_msg_write_cb (GObject
*source
,
346 GAsyncResult
*result
,
349 GTask
*task
= user_data
;
350 ConnectAsyncData
*data
= g_task_get_task_data (task
);
351 GError
*error
= NULL
;
354 written
= g_output_stream_write_finish (G_OUTPUT_STREAM (source
),
359 g_task_return_error (task
, error
);
360 g_object_unref (task
);
364 data
->offset
+= written
;
366 if (data
->offset
== data
->length
)
368 g_free (data
->buffer
);
370 data
->buffer
= g_malloc0 (SOCKS4_CONN_REP_LEN
);
371 data
->length
= SOCKS4_CONN_REP_LEN
;
374 do_read (connect_reply_read_cb
, task
, data
);
378 do_write (connect_msg_write_cb
, task
, data
);
383 connect_reply_read_cb (GObject
*source
,
384 GAsyncResult
*result
,
387 GTask
*task
= user_data
;
388 ConnectAsyncData
*data
= g_task_get_task_data (task
);
389 GError
*error
= NULL
;
392 read
= g_input_stream_read_finish (G_INPUT_STREAM (source
),
397 g_task_return_error (task
, error
);
398 g_object_unref (task
);
402 data
->offset
+= read
;
404 if (data
->offset
== data
->length
)
406 if (!parse_connect_reply (data
->buffer
, &error
))
408 g_task_return_error (task
, error
);
409 g_object_unref (task
);
414 g_task_return_pointer (task
, g_object_ref (data
->io_stream
), g_object_unref
);
415 g_object_unref (task
);
421 do_read (connect_reply_read_cb
, task
, data
);
425 static GIOStream
*g_socks4a_proxy_connect_finish (GProxy
*proxy
,
426 GAsyncResult
*result
,
430 g_socks4a_proxy_connect_finish (GProxy
*proxy
,
431 GAsyncResult
*result
,
434 return g_task_propagate_pointer (G_TASK (result
), error
);
438 g_socks4a_proxy_supports_hostname (GProxy
*proxy
)
440 return G_SOCKS4A_PROXY (proxy
)->supports_hostname
;
444 g_socks4a_proxy_class_init (GSocks4aProxyClass
*class)
446 GObjectClass
*object_class
;
448 object_class
= (GObjectClass
*) class;
449 object_class
->finalize
= g_socks4a_proxy_finalize
;
453 g_socks4a_proxy_iface_init (GProxyInterface
*proxy_iface
)
455 proxy_iface
->connect
= g_socks4a_proxy_connect
;
456 proxy_iface
->connect_async
= g_socks4a_proxy_connect_async
;
457 proxy_iface
->connect_finish
= g_socks4a_proxy_connect_finish
;
458 proxy_iface
->supports_hostname
= g_socks4a_proxy_supports_hostname
;