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/*
This file is part of GNUnet.
(C) 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include "platform.h"
#include <gnunet_util_lib.h>
#include "gns_proxy_proto.h"
#define GNUNET_GNS_PROXY_PORT 7777
struct Socks5Request
{
struct Socks5Request *prev;
struct Socks5Request *next;
struct GNUNET_NETWORK_Handle *sock;
int state;
GNUNET_SCHEDULER_TaskIdentifier rtask;
};
struct Socks5Connections
{
struct Socks5Request *head;
struct Socks5Request *tail;
};
unsigned long port = GNUNET_GNS_PROXY_PORT;
static struct GNUNET_NETWORK_Handle *lsock;
GNUNET_SCHEDULER_TaskIdentifier ltask;
static struct Socks5Connections s5conns;
/**
* Read data from incoming connection
*
* @param cls the closure
* @param tc the scheduler context
*/
static void
do_read (void* cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct Socks5Request *s5r = cls;
char rbuf[512];
unsigned int len;
s5r->rtask = GNUNET_SCHEDULER_NO_TASK;
if ((NULL != tc->write_ready) &&
(GNUNET_NETWORK_fdset_isset (tc->read_ready, s5r->sock)) &&
(len = GNUNET_NETWORK_socket_recv (s5r->sock, &rbuf, sizeof (rbuf))))
{
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Successfully read %d bytes from socket\n",
len);
}
else
{
//ERROR!
GNUNET_NETWORK_socket_close (s5r->sock);
GNUNET_free(s5r);
return;
}
if (s5r->state == SOCKS5_INIT)
{
//DO sth etc
}
GNUNET_CONTAINER_DLL_remove (s5conns.head, s5conns.tail, s5r);
}
/**
* Accept new incoming connections
*
* @param cls the closure
* @param tc the scheduler context
*/
static void
do_accept (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct GNUNET_NETWORK_Handle *s;
struct Socks5Request *s5r;
ltask = GNUNET_SCHEDULER_NO_TASK;
if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
return;
ltask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
lsock,
&do_accept, NULL);
s = GNUNET_NETWORK_socket_accept (lsock, NULL, NULL);
if (NULL == s)
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_INFO, "accept");
return;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Got an inbound connection, waiting for data\n");
s5r = GNUNET_malloc (sizeof (struct Socks5Request));
s5r->sock = s;
s5r->state = SOCKS5_INIT;
s5r->rtask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
s5r->sock,
&do_read, s5r);
GNUNET_CONTAINER_DLL_insert (s5conns.head, s5conns.tail, s5r);
}
/**
* Main function that will be run
*
* @param cls closure
* @param args remaining command-line arguments
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param cfg configuration
*/
static void
run (void *cls, char *const *args, const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct sockaddr_in sa;
memset (&sa, 0, sizeof (sa));
sa.sin_family = AF_INET;
sa.sin_port = htons (port);
#if HAVE_SOCKADDR_IN_SIN_LEN
sa.sin_len = sizeof (sa);
#endif
lsock = GNUNET_NETWORK_socket_create (AF_INET,
SOCK_STREAM,
0);
if ((NULL == lsock) ||
(GNUNET_OK !=
GNUNET_NETWORK_socket_bind (lsock, (const struct sockaddr *) &sa,
sizeof (sa))))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to create listen socket bound to `%s'",
GNUNET_a2s ((const struct sockaddr *) &sa, sizeof (sa)));
if (NULL != lsock)
GNUNET_NETWORK_socket_close (lsock);
return;
}
if (GNUNET_OK != GNUNET_NETWORK_socket_listen (lsock, 5))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
"Failed to listen on socket bound to `%s'",
GNUNET_a2s ((const struct sockaddr *) &sa, sizeof (sa)));
return;
}
ltask = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
lsock, &do_accept, NULL);
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Proxy listens on port %u\n",
port);
}
/**
* The main function for gnunet-gns-proxy.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc, char *const *argv)
{
static const struct GNUNET_GETOPT_CommandLineOption options[] = {
{'p', "port", NULL,
gettext_noop ("listen on specified port"), 1,
&GNUNET_GETOPT_set_string, &port},
GNUNET_GETOPT_OPTION_END
};
int ret;
GNUNET_log_setup ("gnunet-gns-proxy", "WARNING", NULL);
ret =
(GNUNET_OK ==
GNUNET_PROGRAM_run (argc, argv, "gnunet-gns-proxy",
_("GNUnet GNS proxy"),
options,
&run, NULL)) ? 0 : 1;
return ret;
}
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