2 This file is part of GNUnet.
3 (C) 2012 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 #include <gnunet_util_lib.h>
23 #include "gns_proxy_proto.h"
26 #define GNUNET_GNS_PROXY_PORT 7777
28 //TODO maybe make this an api call
30 * Checks if name is in tld
32 * @param name the name to check
33 * @param tld the TLD to check for
34 * @return GNUNET_YES or GNUNET_NO
37 is_tld(const char* name, const char* tld)
41 if (strlen(name) <= strlen(tld))
46 offset = strlen(name)-strlen(tld);
47 if (strcmp (name+offset, tld) != 0)
49 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
50 "%s is not in .%s TLD\n", name, tld);
59 struct Socks5Request *prev;
60 struct Socks5Request *next;
62 struct GNUNET_NETWORK_Handle *sock;
63 struct GNUNET_NETWORK_Handle *remote_sock;
67 GNUNET_SCHEDULER_TaskIdentifier rtask;
68 GNUNET_SCHEDULER_TaskIdentifier wtask;
72 unsigned int rbuf_len;
73 unsigned int wbuf_len;
76 struct Socks5Connections
78 struct Socks5Request *head;
79 struct Socks5Request *tail;
83 unsigned long port = GNUNET_GNS_PROXY_PORT;
84 static struct GNUNET_NETWORK_Handle *lsock;
85 GNUNET_SCHEDULER_TaskIdentifier ltask;
86 static struct Socks5Connections s5conns;
89 * Write data to socket
91 * @param cls the closure
92 * @param tc scheduler context
95 do_write (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
97 struct Socks5Request *s5r = cls;
98 unsigned int len = s5r->wbuf_len;
100 s5r->wtask = GNUNET_SCHEDULER_NO_TASK;
102 if ((NULL != tc->read_ready) &&
103 (GNUNET_NETWORK_fdset_isset (tc->write_ready, s5r->sock)) &&
104 (len = GNUNET_NETWORK_socket_send (s5r->sock, &s5r->wbuf,
107 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
108 "Successfully sent %d bytes to socket\n",
113 GNUNET_NETWORK_socket_close (s5r->sock);
120 * Read data from incoming connection
122 * @param cls the closure
123 * @param tc the scheduler context
126 do_read (void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
128 struct Socks5Request *s5r = cls;
130 struct socks5_client_hello *c_hello;
131 struct socks5_server_hello *s_hello;
132 struct socks5_client_request *c_req;
133 struct socks5_server_response *s_resp;
138 struct hostent *phost;
140 struct sockaddr_in remote_addr;
141 struct in_addr *r_sin_addr;
143 s5r->rtask = GNUNET_SCHEDULER_NO_TASK;
145 if ((NULL != tc->write_ready) &&
146 (GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) &&
147 (len = GNUNET_NETWORK_socket_recv (s5r->sock, &s5r->rbuf,
148 sizeof (s5r->rbuf))))
150 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
151 "Successfully read %d bytes from socket\n",
157 GNUNET_NETWORK_socket_close (s5r->sock);
162 if (s5r->state == SOCKS5_INIT)
164 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
166 c_hello = (struct socks5_client_hello*)&s5r->rbuf;
168 GNUNET_assert (c_hello->version == SOCKS_VERSION_5);
170 s_hello = (struct socks5_server_hello*)&s5r->wbuf;
171 s5r->wbuf_len = sizeof( struct socks5_server_hello );
173 s_hello->version = c_hello->version;
174 s_hello->auth_method = SOCKS_AUTH_NONE;
176 /* Write response to client */
177 s5r->wtask = GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
181 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
185 s5r->state = SOCKS5_REQUEST;
189 if (s5r->state == SOCKS5_REQUEST)
191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
192 "Processing SOCKS5 request\n");
193 c_req = (struct socks5_client_request*)&s5r->rbuf;
194 s_resp = (struct socks5_server_response*)&s5r->wbuf;
195 s5r->wbuf_len = sizeof (struct socks5_server_response);
197 GNUNET_assert (c_req->addr_type == 3);
199 dom_len = *((uint8_t*)(&(c_req->addr_type) + 1));
200 memset(domain, 0, sizeof(domain));
201 strncpy(domain, (char*)(&(c_req->addr_type) + 2), dom_len);
202 req_port = *((uint16_t*)(&(c_req->addr_type) + 2 + dom_len));
204 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
205 "Requested connection is %s:%d\n",
209 if (is_tld (domain, GNUNET_GNS_TLD) ||
210 is_tld (domain, GNUNET_GNS_TLD_ZKEY))
212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
213 "Requested connection is gnunet tld\n",
218 phost = (struct hostent*)gethostbyname (domain);
221 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
222 "Resolve %s error!\n", domain );
223 s_resp->version = 0x05;
224 s_resp->reply = 0x01;
226 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
230 //TODO! close socket after the write! schedule task
231 //GNUNET_NETWORK_socket_close (s5r->sock);
236 s5r->remote_sock = GNUNET_NETWORK_socket_create (AF_INET,
239 r_sin_addr = (struct in_addr*)(phost->h_addr);
240 remote_ip = r_sin_addr->s_addr;
241 memset(&remote_addr, 0, sizeof(remote_addr));
242 remote_addr.sin_family = AF_INET;
243 remote_addr.sin_addr.s_addr = remote_ip;
244 remote_addr.sin_port = req_port;
246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
247 "target server: %s:%u\n", inet_ntoa(remote_addr.sin_addr),
250 GNUNET_assert ( s5r->remote_sock != NULL );
253 GNUNET_NETWORK_socket_connect ( s5r->remote_sock,
254 (struct sockaddr*)&remote_addr,
255 sizeof (struct sockaddr)))
257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
258 "socket request error...\n");
259 s_resp->version = 0x05;
260 s_resp->reply = 0x01;
262 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
269 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
270 "new remote connection\n");
272 s_resp->version = 0x05;
273 s_resp->reply = 0x00;
274 s_resp->reserved = 0x00;
275 s_resp->addr_type = 0x01;
277 s5r->state = SOCKS5_DATA_TRANSFER;
280 GNUNET_SCHEDULER_add_write_net (GNUNET_TIME_UNIT_FOREVER_REL,
287 //GNUNET_CONTAINER_DLL_remove (s5conns.head, s5conns.tail, s5r);
292 * Accept new incoming connections
294 * @param cls the closure
295 * @param tc the scheduler context
298 do_accept (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
300 struct GNUNET_NETWORK_Handle *s;
301 struct Socks5Request *s5r;
303 ltask = GNUNET_SCHEDULER_NO_TASK;
304 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
307 ltask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
311 s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
315 GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO, "accept");
319 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
320 "Got an inbound connection, waiting for data\n");
322 s5r = GNUNET_malloc (sizeof (struct Socks5Request));
324 s5r->state = SOCKS5_INIT;
325 s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
328 GNUNET_CONTAINER_DLL_insert (s5conns.head, s5conns.tail, s5r);
332 * Main function that will be run
335 * @param args remaining command-line arguments
336 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
337 * @param cfg configuration
340 run (void *cls, char *const *args, const char *cfgfile,
341 const struct GNUNET_CONFIGURATION_Handle *cfg)
343 struct sockaddr_in sa;
345 memset (&sa, 0, sizeof (sa));
346 sa.sin_family = AF_INET;
347 sa.sin_port = htons (port);
348 #if HAVE_SOCKADDR_IN_SIN_LEN
349 sa.sin_len = sizeof (sa);
352 lsock = GNUNET_NETWORK_socket_create (AF_INET,
356 if ((NULL == lsock) ||
358 GNUNET_NETWORK_socket_bind (lsock, (const struct sockaddr *) &sa,
361 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
362 "Failed to create listen socket bound to `%s'",
363 GNUNET_a2s ((const struct sockaddr *) &sa, sizeof (sa)));
365 GNUNET_NETWORK_socket_close (lsock);
369 if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock, 5))
371 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
372 "Failed to listen on socket bound to `%s'",
373 GNUNET_a2s ((const struct sockaddr *) &sa, sizeof (sa)));
377 ltask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
378 lsock, &do_accept, NULL);
380 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
381 "Proxy listens on port %u\n",
387 * The main function for gnunet-gns-proxy.
389 * @param argc number of arguments from the command line
390 * @param argv command line arguments
391 * @return 0 ok, 1 on error
394 main (int argc, char *const *argv)
396 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
398 gettext_noop ("listen on specified port"), 1,
399 &GNUNET_GETOPT_set_string, &port},
400 GNUNET_GETOPT_OPTION_END
405 GNUNET_log_setup ("gnunet-gns-proxy", "WARNING", NULL);
408 GNUNET_PROGRAM_run (argc, argv, "gnunet-gns-proxy",
409 _("GNUnet GNS proxy"),
411 &run, NULL)) ? 0 : 1;