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/*
* Copyright (c) 2003-2009 by FlashCode <flashcode@flashtux.org>
* See README for License detail, AUTHORS for developers list.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* relay-network.c: network functions for relay plugin */
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.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-buffer.h"
#include "relay-client.h"
#include "relay-config.h"
int relay_network_sock = -1; /* socket used for listening and */
/* waiting for clients */
struct t_hook *relay_network_hook_fd = NULL;
int relay_network_listen_port = -1; /* listening port */
/*
* relay_network_close_socket: close socket
*/
void
relay_network_close_socket ()
{
if (relay_network_hook_fd)
{
weechat_unhook (relay_network_hook_fd);
relay_network_hook_fd = NULL;
}
if (relay_network_sock >= 0)
{
close (relay_network_sock);
relay_network_sock = -1;
weechat_printf (NULL,
_("%s: socket closed"),
RELAY_PLUGIN_NAME);
}
}
/*
* relay_network_sock_cb: read data from a client which is connecting on socket
*/
int
relay_network_sock_cb (void *data, int fd)
{
struct sockaddr_in client_addr;
unsigned int client_length;
int client_fd;
char ipv4_address[INET_ADDRSTRLEN + 1], *ptr_address;
/* make C compiler happy */
(void) data;
(void) fd;
client_length = sizeof (client_addr);
memset (&client_addr, 0, client_length);
client_fd = accept (relay_network_sock, (struct sockaddr *) &client_addr,
&client_length);
if (client_fd < 0)
{
weechat_printf (NULL,
_("%s%s: cannot accept client"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
return WEECHAT_RC_OK;
}
ptr_address = NULL;
if (inet_ntop (AF_INET,
&(client_addr.sin_addr),
ipv4_address,
INET_ADDRSTRLEN))
{
ptr_address = ipv4_address;
}
relay_client_new (client_fd, ptr_address);
return WEECHAT_RC_OK;
}
/*
* relay_network_init: init socket and listen on port
* return 1 if ok, 0 if error
*/
int
relay_network_init ()
{
int set, args, port, port_start, port_end;
struct sockaddr_in server_addr;
const char *port_range;
relay_network_close_socket ();
if (!weechat_config_boolean (relay_config_network_enabled))
return 1;
port_range = weechat_config_string (relay_config_network_listen_port_range);
if (!port_range || !port_range[0])
{
weechat_printf (NULL,
_("%s%s: option \"listen_port_range\" is not defined"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
return 0;
}
relay_network_sock = socket (AF_INET, SOCK_STREAM, 0);
if (relay_network_sock < 0)
{
weechat_printf (NULL,
_("%s%s: cannot create socket"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
return 0;
}
set = 1;
if (setsockopt (relay_network_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 (relay_network_sock);
relay_network_sock = -1;
return 0;
}
set = 1;
if (setsockopt (relay_network_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 (relay_network_sock);
relay_network_sock = -1;
return 0;
}
memset(&server_addr, 0, sizeof(struct sockaddr_in));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = INADDR_ANY;
port = -1;
/* find a free port in the specified range */
args = sscanf (weechat_config_string (relay_config_network_listen_port_range),
"%d-%d", &port_start, &port_end);
if (args > 0)
{
port = port_start;
if (args == 1)
port_end = port_start;
/* loop through the entire allowed port range */
while (port <= port_end)
{
/* attempt to bind to the free port */
server_addr.sin_port = htons (port);
if (bind (relay_network_sock, (struct sockaddr *) &server_addr,
sizeof (server_addr)) == 0)
break;
port++;
}
if (port > port_end)
port = -1;
}
if (port < 0)
{
weechat_printf (NULL,
_("%s%s: cannot find available port for listening"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
close (relay_network_sock);
relay_network_sock = -1;
return 0;
}
relay_network_listen_port = port;
listen (relay_network_sock, 5);
weechat_printf (NULL,
_("%s: listening on port %d"),
RELAY_PLUGIN_NAME, relay_network_listen_port);
relay_network_hook_fd = weechat_hook_fd (relay_network_sock,
1, 0, 0,
&relay_network_sock_cb,
NULL);
return 1;
}
/*
* relay_network_end: close main socket
*/
void
relay_network_end ()
{
relay_network_close_socket ();
}
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