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/*
* Copyright (C) 2003-2012 Sebastien Helleu <flashcode@flashtux.org>
*
* This file is part of WeeChat, the extensible chat client.
*
* WeeChat 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 of the License, or
* (at your option) any later version.
*
* WeeChat 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 WeeChat. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* relay-server.c: server functions for relay plugin
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "../weechat-plugin.h"
#include "relay.h"
#include "relay-server.h"
#include "relay-buffer.h"
#include "relay-client.h"
#include "relay-config.h"
struct t_relay_server *relay_servers = NULL;
struct t_relay_server *last_relay_server = NULL;
/*
* relay_server_get_protocol_args: get protocol and arguments from a string
* with format "protocol.args"
* Note: *protocol and *protocol_args must be
* freed after use
*/
void
relay_server_get_protocol_args (const char *protocol_and_args,
char **protocol, char **protocol_args)
{
char *pos;
pos = strchr (protocol_and_args, '.');
if (pos)
{
*protocol = weechat_strndup (protocol_and_args,
pos - protocol_and_args);
*protocol_args = strdup (pos + 1);
}
else
{
*protocol = strdup (protocol_and_args);
*protocol_args = NULL;
}
}
/*
* relay_server_search: search server by protocol.args
*/
struct t_relay_server *
relay_server_search (const char *protocol_and_args)
{
char *protocol, *protocol_args;
struct t_relay_server *ptr_server;
relay_server_get_protocol_args (protocol_and_args,
&protocol, &protocol_args);
ptr_server = NULL;
if (protocol)
{
for (ptr_server = relay_servers; ptr_server;
ptr_server = ptr_server->next_server)
{
if (strcmp (protocol, relay_protocol_string[ptr_server->protocol]) == 0)
{
if (!protocol_args && !ptr_server->protocol_args)
break;
if (protocol_args && ptr_server->protocol_args
&& (strcmp (protocol_args, ptr_server->protocol_args) == 0))
{
break;
}
}
}
}
if (protocol)
free (protocol);
if (protocol_args)
free (protocol_args);
return ptr_server;
}
/*
* relay_server_search_port: search server by port
*/
struct t_relay_server *
relay_server_search_port (int port)
{
struct t_relay_server *ptr_server;
for (ptr_server = relay_servers; ptr_server;
ptr_server = ptr_server->next_server)
{
if (ptr_server->port == port)
return ptr_server;
}
/* server not found */
return NULL;
}
/*
* relay_server_close_socket: close socket for a relay server
*/
void
relay_server_close_socket (struct t_relay_server *server)
{
if (server->hook_fd)
{
weechat_unhook (server->hook_fd);
server->hook_fd = NULL;
}
if (server->sock >= 0)
{
close (server->sock);
server->sock = -1;
if (!relay_signal_upgrade_received)
{
weechat_printf (NULL,
_("%s: socket closed for %s%s%s (port %d)"),
RELAY_PLUGIN_NAME,
relay_protocol_string[server->protocol],
(server->protocol_args) ? "." : "",
(server->protocol_args) ? server->protocol_args : "",
server->port);
}
}
}
/*
* relay_server_sock_cb: read data from a client which is connecting on socket
*/
int
relay_server_sock_cb (void *data, int fd)
{
struct t_relay_server *server;
struct sockaddr_in client_addr;
socklen_t client_length;
int client_fd;
char ipv4_address[INET_ADDRSTRLEN + 1], *ptr_address;
/* make C compiler happy */
(void) fd;
server = (struct t_relay_server *)data;
client_length = sizeof (client_addr);
memset (&client_addr, 0, client_length);
client_fd = accept (server->sock, (struct sockaddr *) &client_addr,
&client_length);
if (client_fd < 0)
{
weechat_printf (NULL,
_("%s%s: cannot accept client on port %d (%s%s%s)"),
weechat_prefix ("error"),
RELAY_PLUGIN_NAME,
server->port,
relay_protocol_string[server->protocol],
(server->protocol_args) ? "." : "",
(server->protocol_args) ? server->protocol_args : "");
return WEECHAT_RC_OK;
}
ptr_address = NULL;
if (inet_ntop (AF_INET,
&(client_addr.sin_addr),
ipv4_address,
INET_ADDRSTRLEN))
{
ptr_address = ipv4_address;
}
/* check if IP is allowed, if not, just close socket */
if (relay_config_regex_allowed_ips
&& (regexec (relay_config_regex_allowed_ips, ptr_address, 0, NULL, 0) != 0))
{
if (weechat_relay_plugin->debug >= 2)
{
weechat_printf (NULL,
_("%s%s: IP address \"%s\" not allowed for relay"),
weechat_prefix ("error"),
RELAY_PLUGIN_NAME,
ptr_address);
}
close (client_fd);
return WEECHAT_RC_OK;
}
relay_client_new (client_fd, ptr_address, server);
return WEECHAT_RC_OK;
}
/*
* relay_server_create_socket: create socket and server on port
*/
int
relay_server_create_socket (struct t_relay_server *server)
{
int set, max_clients;
struct sockaddr_in server_addr;
server->sock = socket (AF_INET, SOCK_STREAM, 0);
if (server->sock < 0)
{
weechat_printf (NULL,
_("%s%s: cannot create socket"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
return 0;
}
set = 1;
if (setsockopt (server->sock, SOL_SOCKET, SO_REUSEADDR,
(void *) &set, sizeof (set)) < 0)
{
weechat_printf (NULL,
_("%s%s: cannot set socket option "
"\"SO_REUSEADDR\""),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
close (server->sock);
server->sock = -1;
return 0;
}
set = 1;
if (setsockopt (server->sock, SOL_SOCKET, SO_KEEPALIVE,
(void *) &set, sizeof (set)) < 0)
{
weechat_printf (NULL,
_("%s%s: cannot set socket option "
"\"SO_KEEPALIVE\""),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
close (server->sock);
server->sock = -1;
return 0;
}
memset(&server_addr, 0, sizeof(struct sockaddr_in));
server_addr.sin_family = AF_INET;
if (weechat_config_string (relay_config_network_bind_address)
&& weechat_config_string (relay_config_network_bind_address)[0])
{
server_addr.sin_addr.s_addr = inet_addr (weechat_config_string (relay_config_network_bind_address));
}
else
{
server_addr.sin_addr.s_addr = INADDR_ANY;
}
server_addr.sin_port = htons (server->port);
if (bind (server->sock, (struct sockaddr *) &server_addr,
sizeof (server_addr)) < 0)
{
weechat_printf (NULL,
_("%s%s: error with \"bind\" on port %d (%s%s%s)"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
server->port,
relay_protocol_string[server->protocol],
(server->protocol_args) ? "." : "",
(server->protocol_args) ? server->protocol_args : "");
close (server->sock);
server->sock = -1;
return 0;
}
max_clients = weechat_config_integer (relay_config_network_max_clients);
listen (server->sock, max_clients);
weechat_printf (NULL,
_("%s: listening on port %d (relay: %s%s%s, max %d clients)"),
RELAY_PLUGIN_NAME,
server->port,
relay_protocol_string[server->protocol],
(server->protocol_args) ? "." : "",
(server->protocol_args) ? server->protocol_args : "",
max_clients);
server->hook_fd = weechat_hook_fd (server->sock,
1, 0, 0,
&relay_server_sock_cb,
server);
server->start_time = time (NULL);
return 1;
}
/*
* relay_server_new: add a socket relaying on a port
*/
struct t_relay_server *
relay_server_new (enum t_relay_protocol protocol,
const char *protocol_args,
int port)
{
struct t_relay_server *new_server;
if (relay_server_search_port (port))
{
weechat_printf (NULL, _("%s%s: error: port \"%d\" is already used"),
weechat_prefix ("error"),
RELAY_PLUGIN_NAME, port);
return NULL;
}
new_server = malloc (sizeof (*new_server));
if (new_server)
{
new_server->protocol = protocol;
new_server->protocol_args =
(protocol_args) ? strdup (protocol_args) : NULL;
new_server->port = port;
new_server->sock = -1;
new_server->hook_fd = NULL;
new_server->start_time = 0;
if (!relay_server_create_socket (new_server))
{
if (new_server->protocol_args)
free (new_server->protocol_args);
free (new_server);
return NULL;
}
new_server->prev_server = NULL;
new_server->next_server = relay_servers;
if (relay_servers)
relay_servers->prev_server = new_server;
else
last_relay_server = new_server;
relay_servers = new_server;
}
else
{
weechat_printf (NULL,
_("%s%s: not enough memory for listening on new port"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
}
return new_server;
}
/*
* relay_server_update_port: update port in a server
*/
void
relay_server_update_port (struct t_relay_server *server, int port)
{
if (port != server->port)
{
relay_server_close_socket (server);
server->port = port;
relay_server_create_socket (server);
}
}
/*
* relay_server_free: remove a server
*/
void
relay_server_free (struct t_relay_server *server)
{
struct t_relay_server *new_relay_servers;
if (!server)
return;
/* remove server from list */
if (last_relay_server == server)
last_relay_server = server->prev_server;
if (server->prev_server)
{
(server->prev_server)->next_server = server->next_server;
new_relay_servers = relay_servers;
}
else
new_relay_servers = server->next_server;
if (server->next_server)
(server->next_server)->prev_server = server->prev_server;
/* free data */
relay_server_close_socket (server);
if (server->protocol_args)
free (server->protocol_args);
free (server);
relay_servers = new_relay_servers;
}
/*
* relay_server_free_all: remove all servers
*/
void
relay_server_free_all ()
{
while (relay_servers)
{
relay_server_free (relay_servers);
}
}
/*
* relay_server_print_log: print server infos in log (usually for crash dump)
*/
void
relay_server_print_log ()
{
struct t_relay_server *ptr_server;
for (ptr_server = relay_servers; ptr_server;
ptr_server = ptr_server->next_server)
{
weechat_log_printf ("");
weechat_log_printf ("[relay server (addr:0x%lx)]", ptr_server);
weechat_log_printf (" protocol. . . . . . : %d (%s)",
ptr_server->protocol,
relay_protocol_string[ptr_server->protocol]);
weechat_log_printf (" protocol_args . . . : '%s'", ptr_server->protocol_args);
weechat_log_printf (" port. . . . . . . . : %d", ptr_server->port);
weechat_log_printf (" sock. . . . . . . . : %d", ptr_server->sock);
weechat_log_printf (" hook_fd . . . . . . : 0x%lx", ptr_server->hook_fd);
weechat_log_printf (" start_time. . . . . : %ld", ptr_server->start_time);
weechat_log_printf (" prev_server . . . . : 0x%lx", ptr_server->prev_server);
weechat_log_printf (" next_server . . . . : 0x%lx", ptr_server->next_server);
}
}
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