/* GNet - Networking library
* Copyright (C) 2001-2002 Marius Eriksen, David Helder
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*/
#include "gnet-private.h"
#include "socks.h"
#include "socks-private.h"
/* **************************************** */
static int socks_negotiate_connect (GTcpSocket *s, const GInetAddr *dst);
static int socks4_negotiate_connect (GIOChannel *ioc, const GInetAddr *dst);
static int socks5_negotiate_connect (GIOChannel *ioc, const GInetAddr *dst);
GTcpSocket*
gnet_private_socks_tcp_socket_new (const GInetAddr* addr)
{
GInetAddr* ss_addr = NULL;
GTcpSocket* s;
int rv;
g_return_val_if_fail (addr != NULL, NULL);
/* Get SOCKS server */
ss_addr = gnet_socks_get_server();
if (!ss_addr)
return NULL;
/* Connect to SOCKS server */
s = gnet_tcp_socket_new_direct (ss_addr);
gnet_inetaddr_delete (ss_addr);
if (!s)
return NULL;
/* Negotiate connection */
rv = socks_negotiate_connect (s, addr);
if (rv < 0)
{
gnet_tcp_socket_delete (s);
return NULL;
}
return s;
}
/* **************************************** */
struct async_data
{
GInetAddr* addr;
GTcpSocketNewAsyncFunc func;
gpointer data;
};
static void async_cb (GTcpSocket* socket, gpointer data);
GTcpSocketNewAsyncID
gnet_private_socks_tcp_socket_new_async (const GInetAddr* addr,
GTcpSocketNewAsyncFunc func,
gpointer data)
{
GTcpSocket* s;
GInetAddr* ss_addr = NULL;
struct async_data* ad;
g_return_val_if_fail(addr != NULL, NULL);
g_return_val_if_fail(func != NULL, NULL);
/* Get SOCKS server */
ss_addr = gnet_socks_get_server();
if (!ss_addr)
return NULL;
/* Create data */
ad = g_new0(struct async_data, 1);
ad->addr = gnet_inetaddr_clone(addr);
ad->func = func;
ad->data = data;
/* Connect to SOCKS server */
s = gnet_tcp_socket_new_async_direct (ss_addr, async_cb, ad);
gnet_inetaddr_delete (ss_addr);
return s; /* s might be NULL */
}
static void
async_cb (GTcpSocket* socket, gpointer data)
{
struct async_data* ad = (struct async_data*) data;
if (socket != NULL)
{
int rv;
rv = socks_negotiate_connect (socket, ad->addr);
if (rv < 0)
goto error;
(ad->func)(socket, ad->data);
gnet_inetaddr_delete (ad->addr);
g_free (ad);
return;
}
error:
(ad->func)(NULL, ad->data);
gnet_inetaddr_delete (ad->addr);
g_free (ad);
}
/* **************************************** */
static int
socks_negotiate_connect (GTcpSocket *s, const GInetAddr *dst)
{
GIOChannel *ioc;
int ver, ret;
ioc = gnet_tcp_socket_get_io_channel(s);
ver = gnet_socks_get_version();
if (ver == 5)
ret = socks5_negotiate_connect (ioc, dst);
else if (ver == 4)
ret = socks4_negotiate_connect (ioc, dst);
else
ret = -1;
return ret;
}
static int
socks4_negotiate_connect (GIOChannel *ioc, const GInetAddr *dst)
{
struct socks4_h s4h;
struct sockaddr_in *sa_in;
gsize len;
sa_in = (struct sockaddr_in*)&dst->sa;
s4h.vn = 4;
s4h.cd = 1;
s4h.dport = (short)sa_in->sin_port;
s4h.dip = (long)sa_in->sin_addr.s_addr;
s4h.userid = 0;
if (gnet_io_channel_writen(ioc, &s4h, 9, &len) != G_IO_ERROR_NONE)
return -1;
if (gnet_io_channel_readn(ioc, &s4h, 8, &len) != G_IO_ERROR_NONE)
return -1;
if ((s4h.cd != 90) || (s4h.vn != 0))
return -1;
return 0;
}
static int
socks5_negotiate_connect (GIOChannel *ioc, const GInetAddr *dst)
{
unsigned char s5r[3];
struct socks5_h s5h;
struct sockaddr_in *sa_in;
gsize len;
s5r[0] = 5;
s5r[1] = 1; /* XXX no authentication yet */
s5r[2] = 0;
if (gnet_io_channel_writen(ioc, s5r, 3, &len) != G_IO_ERROR_NONE)
return -1;
if (gnet_io_channel_readn(ioc, s5r, 2, &len) != G_IO_ERROR_NONE)
return -1;
if ((s5r[0] != 5) || (s5r[1] != 0))
return -1;
sa_in = (struct sockaddr_in*)&dst->sa;
/* fill in SOCKS5 request */
s5h.vn = 5;
s5h.cd = 1;
s5h.rsv = 0;
s5h.atyp = 1;
s5h.dip = (long)sa_in->sin_addr.s_addr;
s5h.dport = (short)sa_in->sin_port;
if (gnet_io_channel_writen(ioc, (gchar*)&s5h, 10, &len) != G_IO_ERROR_NONE)
return -1;
if (gnet_io_channel_readn(ioc, (gchar*)&s5h, 10, &len) != G_IO_ERROR_NONE)
return -1;
if (s5h.cd != 0)
return -1;
return 0;
}
/* **************************************** */
static int socks5_negotiate_bind (GTcpSocket* socket, int port);
static gboolean socks_tcp_socket_server_accept_async_cb (GIOChannel* iochannel,
GIOCondition condition,
gpointer data);
GTcpSocket*
gnet_private_socks_tcp_socket_server_new (gint port)
{
GInetAddr* ss_addr = NULL;
GTcpSocket* s;
int rv;
/* We only support SOCKS 5 */
if (gnet_socks_get_version () != 5)
return NULL;
/* Get SOCKS server */
ss_addr = gnet_socks_get_server();
if (!ss_addr)
return NULL;
/* Connect to SOCKS server */
s = gnet_tcp_socket_new_direct (ss_addr);
gnet_inetaddr_delete (ss_addr);
if (!s)
return NULL;
/* Negotiate connection */
rv = socks5_negotiate_bind (s, port);
if (rv < 0)
{
gnet_tcp_socket_delete (s);
return NULL;
}
return s;
}
static int
socks5_negotiate_bind (GTcpSocket* socket, int port)
{
GIOChannel *ioc;
unsigned char s5r[3];
struct socks5_h s5h;
gsize len;
ioc = gnet_tcp_socket_get_io_channel(socket);
s5r[0] = 5;
s5r[1] = 1; /* no authentication */
s5r[2] = 0;
if (gnet_io_channel_writen(ioc, s5r, 3, &len) != G_IO_ERROR_NONE)
goto error;
if (gnet_io_channel_readn(ioc, s5r, 2, &len) != G_IO_ERROR_NONE)
goto error;
if ((s5r[0] != 5) || (s5r[1] != 0))
goto error;
/* fill in SOCKS5 request */
s5h.vn = 5;
s5h.cd = 2; /* bind */
s5h.rsv = 0;
s5h.atyp = 1;
s5h.dip = 0; /* FIX: this works with nylon; i will check on rfc */
s5h.dport = g_htons(port);
if (gnet_io_channel_writen(ioc, (gchar*)&s5h, 10, &len) != G_IO_ERROR_NONE)
goto error;
/* this reply simply confirms */
if (gnet_io_channel_readn(ioc, (gchar*)&s5h, 10, &len) != G_IO_ERROR_NONE)
goto error;
/* make sure we have a connection */
if (s5h.cd != 0)
goto error;
/* Copy the address */
GNET_SOCKADDR_IN(socket->sa).sin_addr.s_addr = s5h.dip;
GNET_SOCKADDR_IN(socket->sa).sin_port = s5h.dport;
return 0;
error:
return -1;
}
/* XXX 0 server SOCKS compliant? */
GTcpSocket*
gnet_private_socks_tcp_socket_server_accept (GTcpSocket* socket)
{
gint server_port;
struct socks5_h s5h;
gsize len;
GIOChannel* iochannel;
GIOError error;
GTcpSocket* s;
GTcpSocket* new_socket;
g_return_val_if_fail (socket, NULL);
/* Save server port */
server_port = g_ntohs(GNET_SOCKADDR_IN(socket->sa).sin_port);
/* this reply reveals the connecting hosts ip and port */
iochannel = gnet_tcp_socket_get_io_channel(socket);
error = gnet_io_channel_readn(iochannel, (gchar*) &s5h, 10, &len);
if (error != G_IO_ERROR_NONE)
return NULL;
/* The client socket is the server socket */
s = g_new0(GTcpSocket, 1);
s->sockfd = socket->sockfd;
GNET_SOCKADDR_IN(s->sa).sin_addr.s_addr = s5h.dip;
GNET_SOCKADDR_IN(s->sa).sin_port = s5h.dport;
s->ref_count = 1;
/* Create a new server socket (we just use the sockfd) */
new_socket = gnet_private_socks_tcp_socket_server_new (server_port);
if (new_socket == NULL)
{
g_free (s); /* ok, we copied sockfd */
return NULL;
}
/* Copy the fd over and delete the new socket */
socket->sockfd = new_socket->sockfd;
g_free (new_socket); /* ok, we copied sockfd */
/* Hand over IOChannel */
if (socket->accept_watch)
{
g_source_remove (socket->accept_watch);
socket->accept_watch = 0;
}
s->iochannel = socket->iochannel;
socket->iochannel = NULL;
/* Reset the async watch if necessary */
if (socket->accept_func)
{
GIOChannel* iochannel;
/* This will recreate the IOChannel */
iochannel = gnet_tcp_socket_get_io_channel (socket);
/* Set the watch on the new IO channel */
socket->accept_watch = g_io_add_watch(iochannel,
G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
socks_tcp_socket_server_accept_async_cb, socket);
}
return s;
}
void
gnet_private_socks_tcp_socket_server_accept_async (GTcpSocket* socket,
GTcpSocketAcceptFunc accept_func,
gpointer user_data)
{
GIOChannel* iochannel;
g_return_if_fail (socket);
g_return_if_fail (accept_func);
g_return_if_fail (!socket->accept_func);
/* Save callback */
socket->accept_func = accept_func;
socket->accept_data = user_data;
/* Add read watch */
iochannel = gnet_tcp_socket_get_io_channel (socket);
socket->accept_watch = g_io_add_watch(iochannel,
G_IO_IN | G_IO_ERR | G_IO_HUP | G_IO_NVAL,
socks_tcp_socket_server_accept_async_cb, socket);
}
static gboolean
socks_tcp_socket_server_accept_async_cb (GIOChannel* iochannel, GIOCondition condition,
gpointer data)
{
GTcpSocket* server = (GTcpSocket*) data;
g_assert (server);
if (condition & G_IO_IN)
{
GTcpSocket* client;
client = gnet_private_socks_tcp_socket_server_accept (server);
if (!client)
return TRUE;
(server->accept_func)(server, client, server->accept_data);
return FALSE;
}
else /* error */
{
gnet_tcp_socket_ref (server);
(server->accept_func)(server, NULL, server->accept_data);
server->accept_watch = 0;
server->accept_func = NULL;
server->accept_data = NULL;
gnet_tcp_socket_unref (server);
return FALSE;
}
return FALSE;
}
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