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1 office 1 /* GIO - GLib Input, Output and Streaming Library
2 *
3 * Copyright (C) 2010 Collabora, Ltd.
4 *
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.
9 *
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.
14 *
15 * You should have received a copy of the GNU Lesser General
16 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 *
18 * Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
19 */
20  
21 #include "config.h"
22  
23 #include "gsocks4aproxy.h"
24  
25 #include <string.h>
26  
27 #include "giomodule.h"
28 #include "giomodule-priv.h"
29 #include "giostream.h"
30 #include "ginetaddress.h"
31 #include "ginputstream.h"
32 #include "glibintl.h"
33 #include "goutputstream.h"
34 #include "gproxy.h"
35 #include "gproxyaddress.h"
36 #include "gtask.h"
37  
38 #define SOCKS4_VERSION 4
39  
40 #define SOCKS4_CMD_CONNECT 1
41 #define SOCKS4_CMD_BIND 2
42  
43 #define SOCKS4_MAX_LEN 255
44  
45 #define SOCKS4_REP_VERSION 0
46 #define SOCKS4_REP_GRANTED 90
47 #define SOCKS4_REP_REJECTED 91
48 #define SOCKS4_REP_NO_IDENT 92
49 #define SOCKS4_REP_BAD_IDENT 93
50  
51 static void g_socks4a_proxy_iface_init (GProxyInterface *proxy_iface);
52  
53 #define g_socks4a_proxy_get_type _g_socks4a_proxy_get_type
54 G_DEFINE_TYPE_WITH_CODE (GSocks4aProxy, g_socks4a_proxy, G_TYPE_OBJECT,
55 G_IMPLEMENT_INTERFACE (G_TYPE_PROXY,
56 g_socks4a_proxy_iface_init)
57 _g_io_modules_ensure_extension_points_registered ();
58 g_io_extension_point_implement (G_PROXY_EXTENSION_POINT_NAME,
59 g_define_type_id,
60 "socks4a",
61 0))
62  
63 static void
64 g_socks4a_proxy_finalize (GObject *object)
65 {
66 /* must chain up */
67 G_OBJECT_CLASS (g_socks4a_proxy_parent_class)->finalize (object);
68 }
69  
70 static void
71 g_socks4a_proxy_init (GSocks4aProxy *proxy)
72 {
73 proxy->supports_hostname = TRUE;
74 }
75  
76 /* |-> SOCKSv4a only
77 * +----+----+----+----+----+----+----+----+----+----+....+----+------+....+------+
78 * | VN | CD | DSTPORT | DSTIP | USERID |NULL| HOST | | NULL |
79 * +----+----+----+----+----+----+----+----+----+----+....+----+------+....+------+
80 * 1 1 2 4 variable 1 variable
81 */
82 #define SOCKS4_CONN_MSG_LEN (9 + SOCKS4_MAX_LEN * 2)
83 static gint
84 set_connect_msg (guint8 *msg,
85 const gchar *hostname,
86 guint16 port,
87 const char *username,
88 GError **error)
89 {
90 GInetAddress *addr;
91 guint len = 0;
92 gsize addr_len;
93 gboolean is_ip;
94 const gchar *ip;
95  
96 msg[len++] = SOCKS4_VERSION;
97 msg[len++] = SOCKS4_CMD_CONNECT;
98  
99 {
100 guint16 hp = g_htons (port);
101 memcpy (msg + len, &hp, 2);
102 len += 2;
103 }
104  
105 is_ip = g_hostname_is_ip_address (hostname);
106  
107 if (is_ip)
108 ip = hostname;
109 else
110 ip = "0.0.0.1";
111  
112 addr = g_inet_address_new_from_string (ip);
113 addr_len = g_inet_address_get_native_size (addr);
114  
115 if (addr_len != 4)
116 {
117 g_set_error (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
118 _("SOCKSv4 does not support IPv6 address '%s'"),
119 ip);
120 g_object_unref (addr);
121 return -1;
122 }
123  
124 memcpy (msg + len, g_inet_address_to_bytes (addr), addr_len);
125 len += addr_len;
126  
127 g_object_unref (addr);
128  
129 if (username)
130 {
131 gsize user_len = strlen (username);
132  
133 if (user_len > SOCKS4_MAX_LEN)
134 {
135 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
136 _("Username is too long for SOCKSv4 protocol"));
137 return -1;
138 }
139  
140 memcpy (msg + len, username, user_len);
141 len += user_len;
142 }
143  
144 msg[len++] = '\0';
145  
146 if (!is_ip)
147 {
148 gsize host_len = strlen (hostname);
149  
150 if (host_len > SOCKS4_MAX_LEN)
151 {
152 g_set_error (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
153 _("Hostname '%s' is too long for SOCKSv4 protocol"),
154 hostname);
155 return -1;
156 }
157  
158 memcpy (msg + len, hostname, host_len);
159 len += host_len;
160 msg[len++] = '\0';
161 }
162  
163 return len;
164 }
165  
166 /*
167 * +----+----+----+----+----+----+----+----+
168 * | VN | CD | DSTPORT | DSTIP |
169 * +----+----+----+----+----+----+----+----+
170 * 1 1 2 4
171 */
172 #define SOCKS4_CONN_REP_LEN 8
173 static gboolean
174 parse_connect_reply (const guint8 *data, GError **error)
175 {
176 if (data[0] != SOCKS4_REP_VERSION)
177 {
178 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
179 _("The server is not a SOCKSv4 proxy server."));
180 return FALSE;
181 }
182  
183 if (data[1] != SOCKS4_REP_GRANTED)
184 {
185 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PROXY_FAILED,
186 _("Connection through SOCKSv4 server was rejected"));
187 return FALSE;
188 }
189  
190 return TRUE;
191 }
192  
193 static GIOStream *
194 g_socks4a_proxy_connect (GProxy *proxy,
195 GIOStream *io_stream,
196 GProxyAddress *proxy_address,
197 GCancellable *cancellable,
198 GError **error)
199 {
200 GInputStream *in;
201 GOutputStream *out;
202 const gchar *hostname;
203 guint16 port;
204 const gchar *username;
205  
206 hostname = g_proxy_address_get_destination_hostname (proxy_address);
207 port = g_proxy_address_get_destination_port (proxy_address);
208 username = g_proxy_address_get_username (proxy_address);
209  
210 in = g_io_stream_get_input_stream (io_stream);
211 out = g_io_stream_get_output_stream (io_stream);
212  
213 /* Send SOCKS4 connection request */
214 {
215 guint8 msg[SOCKS4_CONN_MSG_LEN];
216 gint len;
217  
218 len = set_connect_msg (msg, hostname, port, username, error);
219  
220 if (len < 0)
221 goto error;
222  
223 if (!g_output_stream_write_all (out, msg, len, NULL,
224 cancellable, error))
225 goto error;
226 }
227  
228 /* Read SOCKS4 response */
229 {
230 guint8 data[SOCKS4_CONN_REP_LEN];
231  
232 if (!g_input_stream_read_all (in, data, SOCKS4_CONN_REP_LEN, NULL,
233 cancellable, error))
234 goto error;
235  
236 if (!parse_connect_reply (data, error))
237 goto error;
238 }
239  
240 return g_object_ref (io_stream);
241  
242 error:
243 return NULL;
244 }
245  
246  
247 typedef struct
248 {
249 GIOStream *io_stream;
250  
251 /* For connecting */
252 guint8 *buffer;
253 gssize length;
254 gssize offset;
255  
256 } ConnectAsyncData;
257  
258 static void connect_msg_write_cb (GObject *source,
259 GAsyncResult *result,
260 gpointer user_data);
261 static void connect_reply_read_cb (GObject *source,
262 GAsyncResult *result,
263 gpointer user_data);
264  
265 static void
266 free_connect_data (ConnectAsyncData *data)
267 {
268 g_object_unref (data->io_stream);
269 g_slice_free (ConnectAsyncData, data);
270 }
271  
272 static void
273 do_read (GAsyncReadyCallback callback, GTask *task, ConnectAsyncData *data)
274 {
275 GInputStream *in;
276 in = g_io_stream_get_input_stream (data->io_stream);
277 g_input_stream_read_async (in,
278 data->buffer + data->offset,
279 data->length - data->offset,
280 g_task_get_priority (task),
281 g_task_get_cancellable (task),
282 callback, task);
283 }
284  
285 static void
286 do_write (GAsyncReadyCallback callback, GTask *task, ConnectAsyncData *data)
287 {
288 GOutputStream *out;
289 out = g_io_stream_get_output_stream (data->io_stream);
290 g_output_stream_write_async (out,
291 data->buffer + data->offset,
292 data->length - data->offset,
293 g_task_get_priority (task),
294 g_task_get_cancellable (task),
295 callback, task);
296 }
297  
298  
299  
300 static void
301 g_socks4a_proxy_connect_async (GProxy *proxy,
302 GIOStream *io_stream,
303 GProxyAddress *proxy_address,
304 GCancellable *cancellable,
305 GAsyncReadyCallback callback,
306 gpointer user_data)
307 {
308 GError *error = NULL;
309 GTask *task;
310 ConnectAsyncData *data;
311 const gchar *hostname;
312 guint16 port;
313 const gchar *username;
314  
315 data = g_slice_new0 (ConnectAsyncData);
316 data->io_stream = g_object_ref (io_stream);
317  
318 task = g_task_new (proxy, cancellable, callback, user_data);
319 g_task_set_task_data (task, data, (GDestroyNotify) free_connect_data);
320  
321 hostname = g_proxy_address_get_destination_hostname (proxy_address);
322 port = g_proxy_address_get_destination_port (proxy_address);
323 username = g_proxy_address_get_username (proxy_address);
324  
325 data->buffer = g_malloc0 (SOCKS4_CONN_MSG_LEN);
326 data->length = set_connect_msg (data->buffer,
327 hostname, port, username,
328 &error);
329 data->offset = 0;
330  
331 if (data->length < 0)
332 {
333 g_task_return_error (task, error);
334 g_object_unref (task);
335 }
336 else
337 {
338 do_write (connect_msg_write_cb, task, data);
339 }
340 }
341  
342 static void
343 connect_msg_write_cb (GObject *source,
344 GAsyncResult *result,
345 gpointer user_data)
346 {
347 GTask *task = user_data;
348 ConnectAsyncData *data = g_task_get_task_data (task);
349 GError *error = NULL;
350 gssize written;
351  
352 written = g_output_stream_write_finish (G_OUTPUT_STREAM (source),
353 result, &error);
354  
355 if (written < 0)
356 {
357 g_task_return_error (task, error);
358 g_object_unref (task);
359 return;
360 }
361  
362 data->offset += written;
363  
364 if (data->offset == data->length)
365 {
366 g_free (data->buffer);
367  
368 data->buffer = g_malloc0 (SOCKS4_CONN_REP_LEN);
369 data->length = SOCKS4_CONN_REP_LEN;
370 data->offset = 0;
371  
372 do_read (connect_reply_read_cb, task, data);
373 }
374 else
375 {
376 do_write (connect_msg_write_cb, task, data);
377 }
378 }
379  
380 static void
381 connect_reply_read_cb (GObject *source,
382 GAsyncResult *result,
383 gpointer user_data)
384 {
385 GTask *task = user_data;
386 ConnectAsyncData *data = g_task_get_task_data (task);
387 GError *error = NULL;
388 gssize read;
389  
390 read = g_input_stream_read_finish (G_INPUT_STREAM (source),
391 result, &error);
392  
393 if (read < 0)
394 {
395 g_task_return_error (task, error);
396 g_object_unref (task);
397 return;
398 }
399  
400 data->offset += read;
401  
402 if (data->offset == data->length)
403 {
404 if (!parse_connect_reply (data->buffer, &error))
405 {
406 g_task_return_error (task, error);
407 g_object_unref (task);
408 return;
409 }
410 else
411 {
412 g_task_return_pointer (task, g_object_ref (data->io_stream), g_object_unref);
413 g_object_unref (task);
414 return;
415 }
416 }
417 else
418 {
419 do_read (connect_reply_read_cb, task, data);
420 }
421 }
422  
423 static GIOStream *g_socks4a_proxy_connect_finish (GProxy *proxy,
424 GAsyncResult *result,
425 GError **error);
426  
427 static GIOStream *
428 g_socks4a_proxy_connect_finish (GProxy *proxy,
429 GAsyncResult *result,
430 GError **error)
431 {
432 return g_task_propagate_pointer (G_TASK (result), error);
433 }
434  
435 static gboolean
436 g_socks4a_proxy_supports_hostname (GProxy *proxy)
437 {
438 return G_SOCKS4A_PROXY (proxy)->supports_hostname;
439 }
440  
441 static void
442 g_socks4a_proxy_class_init (GSocks4aProxyClass *class)
443 {
444 GObjectClass *object_class;
445  
446 object_class = (GObjectClass *) class;
447 object_class->finalize = g_socks4a_proxy_finalize;
448 }
449  
450 static void
451 g_socks4a_proxy_iface_init (GProxyInterface *proxy_iface)
452 {
453 proxy_iface->connect = g_socks4a_proxy_connect;
454 proxy_iface->connect_async = g_socks4a_proxy_connect_async;
455 proxy_iface->connect_finish = g_socks4a_proxy_connect_finish;
456 proxy_iface->supports_hostname = g_socks4a_proxy_supports_hostname;
457 }