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|
/*
* relay-server.c - server functions for relay plugin
*
* Copyright (C) 2003-2018 Sébastien 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/>.
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <errno.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;
/*
* Extracts protocol, arguments and options from a string with format
* "options.protocol.args".
*
* Examples:
*
* string ipv4 ipv6 ssl protocol protocol_args
* ---------------------------------------------------------------
* irc.freenode 1 1 0 irc freenode
* ssl.irc.freenode 1 1 1 irc freenode
* ipv4.irc.freenode 1 0 0 irc freenode
* ipv6.irc.freenode 0 1 0 irc freenode
* ipv4.ipv6.irc.freenode 1 1 0 irc freenode
* ipv6.ssl.irc.freenode 0 1 1 irc freenode
* weechat 1 1 0 weechat
* ssl.weechat 1 1 1 weechat
* ipv6.ssl.weechat 0 1 1 weechat
*
* Note: *protocol and *protocol_args must be freed after use.
*/
void
relay_server_get_protocol_args (const char *protocol_and_args,
int *ipv4, int *ipv6, int *ssl,
char **protocol, char **protocol_args)
{
int opt_ipv4, opt_ipv6, opt_ssl;
char *pos;
opt_ipv4 = -1;
opt_ipv6 = -1;
opt_ssl = 0;
while (1)
{
if (strncmp (protocol_and_args, "ipv4.", 5) == 0)
{
opt_ipv4 = 1;
protocol_and_args += 5;
}
else if (strncmp (protocol_and_args, "ipv6.", 5) == 0)
{
opt_ipv6 = 1;
protocol_and_args += 5;
}
else if (strncmp (protocol_and_args, "ssl.", 4) == 0)
{
opt_ssl = 1;
protocol_and_args += 4;
}
else
break;
}
if ((opt_ipv4 == -1) && (opt_ipv6 == -1))
{
/*
* no IPv4/IPv6 specified, then use defaults:
* - IPv4 enabled
* - IPv6 enabled if option relay.network.ipv6 is on
*/
opt_ipv4 = 1;
opt_ipv6 = weechat_config_boolean (relay_config_network_ipv6);
}
else
{
if (opt_ipv4 == -1)
opt_ipv4 = 0;
if (opt_ipv6 == -1)
opt_ipv6 = 0;
}
if (!opt_ipv4 && !opt_ipv6)
{
/* both IPv4/IPv6 disabled (should never occur!) */
opt_ipv4 = 1;
}
if (ipv4)
*ipv4 = opt_ipv4;
if (ipv6)
*ipv6 = opt_ipv6;
if (ssl)
*ssl = opt_ssl;
pos = strchr (protocol_and_args, '.');
if (pos)
{
if (protocol)
{
*protocol = weechat_strndup (protocol_and_args,
pos - protocol_and_args);
}
if (protocol_args)
*protocol_args = strdup (pos + 1);
}
else
{
if (protocol)
*protocol = strdup (protocol_and_args);
if (protocol_args)
*protocol_args = NULL;
}
}
/*
* Searches for a server by protocol.args.
*
* Returns pointer to server, NULL if not found.
*/
struct t_relay_server *
relay_server_search (const char *protocol_and_args)
{
struct t_relay_server *ptr_server;
for (ptr_server = relay_servers; ptr_server;
ptr_server = ptr_server->next_server)
{
if (strcmp (protocol_and_args, ptr_server->protocol_string) == 0)
return ptr_server;
}
return NULL;
}
/*
* Searches for a server by port.
*
* Returns pointer to new server, NULL if not found.
*/
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;
}
/*
* Closes 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 (port %d)"),
RELAY_PLUGIN_NAME, server->protocol_string,
server->port);
}
}
}
/*
* Reads data from a client which is connecting on socket.
*/
int
relay_server_sock_cb (const void *pointer, void *data, int fd)
{
struct t_relay_server *server;
struct sockaddr_in client_addr;
struct sockaddr_in6 client_addr6;
socklen_t client_addr_size;
void *ptr_addr;
int client_fd, flags, set, max_clients, num_clients_on_port;
char ipv4_address[INET_ADDRSTRLEN + 1], ipv6_address[INET6_ADDRSTRLEN + 1];
char *ptr_ip_address;
const char *relay_password;
/* make C compiler happy */
(void) data;
(void) fd;
server = (struct t_relay_server *)pointer;
if (server->ipv6)
{
ptr_addr = &client_addr6;
client_addr_size = sizeof (struct sockaddr_in6);
}
else
{
ptr_addr = &client_addr;
client_addr_size = sizeof (struct sockaddr_in);
}
memset (ptr_addr, 0, client_addr_size);
client_fd = accept (server->sock, (struct sockaddr *)ptr_addr,
&client_addr_size);
if (client_fd < 0)
{
weechat_printf (NULL,
_("%s%s: cannot accept client on port %d (%s): error %d %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
server->port, server->protocol_string,
errno, strerror (errno));
return WEECHAT_RC_OK;
}
/* check if relay password is empty and if it is not allowed */
relay_password = weechat_string_eval_expression (
weechat_config_string (relay_config_network_password),
NULL, NULL, NULL);
if (!weechat_config_boolean (relay_config_network_allow_empty_password)
&& (!relay_password || !relay_password[0]))
{
weechat_printf (NULL,
_("%s%s: cannot accept client because relay password "
"is empty, and option "
"relay.network.allow_empty_password is off"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
close (client_fd);
return WEECHAT_RC_OK;
}
/* check if we have reached the max number of clients on this port */
max_clients = weechat_config_integer (relay_config_network_max_clients);
if (max_clients > 0)
{
num_clients_on_port = relay_client_count_active_by_port (server->port);
if (num_clients_on_port >= max_clients)
{
weechat_printf (
NULL,
NG_("%s%s: client not allowed (max %d client is "
"allowed at same time)",
"%s%s: client not allowed (max %d clients are "
"allowed at same time)",
max_clients),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
max_clients);
close (client_fd);
return WEECHAT_RC_OK;
}
}
/* get the IP address */
ptr_ip_address = NULL;
if (server->ipv6)
{
if (inet_ntop (AF_INET6,
&(client_addr6.sin6_addr),
ipv6_address,
INET6_ADDRSTRLEN))
{
ptr_ip_address = ipv6_address;
if (strncmp (ptr_ip_address, "::ffff:", 7) == 0)
{
/* actually an IPv4-mapped IPv6 address, so skip "::ffff:" */
ptr_ip_address += 7;
}
}
}
else
{
if (inet_ntop (AF_INET,
&(client_addr.sin_addr),
ipv4_address,
INET_ADDRSTRLEN))
{
ptr_ip_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_ip_address, 0, NULL, 0) != 0))
{
if (weechat_relay_plugin->debug >= 1)
{
weechat_printf (NULL,
_("%s%s: IP address \"%s\" not allowed for relay"),
weechat_prefix ("error"),
RELAY_PLUGIN_NAME,
ptr_ip_address);
}
close (client_fd);
return WEECHAT_RC_OK;
}
/* set non-blocking mode for socket */
flags = fcntl (client_fd, F_GETFL);
if (flags == -1)
flags = 0;
fcntl (client_fd, F_SETFL, flags | O_NONBLOCK);
/* set socket option SO_REUSEADDR */
set = 1;
if (setsockopt (client_fd, SOL_SOCKET, SO_REUSEADDR,
(void *) &set, sizeof (set)) < 0)
{
weechat_printf (NULL,
_("%s%s: cannot set socket option \"%s\" to %d: "
"error %d %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
"SO_REUSEADDR", set, errno, strerror (errno));
close (client_fd);
return WEECHAT_RC_OK;
}
/* add the client */
relay_client_new (client_fd, ptr_ip_address, server);
return WEECHAT_RC_OK;
}
/*
* Creates socket and server on port.
*
* Returns:
* 1: OK
* 0: error
*/
int
relay_server_create_socket (struct t_relay_server *server)
{
int domain, set, max_clients, addr_size;
struct sockaddr_in server_addr;
struct sockaddr_in6 server_addr6;
const char *bind_address;
void *ptr_addr;
bind_address = weechat_config_string (relay_config_network_bind_address);
if (server->ipv6)
{
domain = AF_INET6;
memset (&server_addr6, 0, sizeof (struct sockaddr_in6));
server_addr6.sin6_family = domain;
server_addr6.sin6_port = htons (server->port);
server_addr6.sin6_addr = in6addr_any;
if (bind_address && bind_address[0])
{
if (!inet_pton (domain, bind_address, &server_addr6.sin6_addr))
{
weechat_printf (NULL,
/* TRANSLATORS: second "%s" is "IPv4" or "IPv6" */
_("%s%s: invalid bind address \"%s\" for %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
bind_address, "IPv6");
return 0;
}
}
ptr_addr = &server_addr6;
addr_size = sizeof (struct sockaddr_in6);
}
else
{
domain = AF_INET;
memset (&server_addr, 0, sizeof (struct sockaddr_in));
server_addr.sin_family = domain;
server_addr.sin_port = htons (server->port);
server_addr.sin_addr.s_addr = INADDR_ANY;
if (bind_address && bind_address[0])
{
if (!inet_pton (domain, bind_address, &server_addr.sin_addr))
{
weechat_printf (NULL,
/* TRANSLATORS: second "%s" is "IPv4" or "IPv6" */
_("%s%s: invalid bind address \"%s\" for %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
bind_address, "IPv4");
return 0;
}
}
ptr_addr = &server_addr;
addr_size = sizeof (struct sockaddr_in);
}
/* create socket */
server->sock = socket (domain, SOCK_STREAM, 0);
if (server->sock < 0)
{
weechat_printf (NULL,
_("%s%s: cannot create socket: error %d %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
errno, strerror (errno));
if (errno == EAFNOSUPPORT)
{
weechat_printf (NULL,
_("%s%s: try /set relay.network.ipv6 off"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME);
}
return 0;
}
#if defined(IPV6_V6ONLY) && !defined(__OpenBSD__)
/* set option IPV6_V6ONLY to 0 or 1 */
if (server->ipv6)
{
set = (server->ipv4) ? 0 : 1;
if (setsockopt (server->sock, IPPROTO_IPV6, IPV6_V6ONLY,
(void *) &set, sizeof (set)) < 0)
{
weechat_printf (NULL,
_("%s%s: cannot set socket option \"%s\" "
"to %d: error %d %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
"IPV6_V6ONLY", set, errno, strerror (errno));
close (server->sock);
server->sock = -1;
return 0;
}
}
#endif
/* set option SO_REUSEADDR to 1 */
set = 1;
if (setsockopt (server->sock, SOL_SOCKET, SO_REUSEADDR,
(void *) &set, sizeof (set)) < 0)
{
weechat_printf (NULL,
_("%s%s: cannot set socket option \"%s\" to %d: "
"error %d %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
"SO_REUSEADDR", set, errno, strerror (errno));
close (server->sock);
server->sock = -1;
return 0;
}
/* set option SO_KEEPALIVE to 1 */
set = 1;
if (setsockopt (server->sock, SOL_SOCKET, SO_KEEPALIVE,
(void *) &set, sizeof (set)) < 0)
{
weechat_printf (NULL,
_("%s%s: cannot set socket option \"%s\" to %d: "
"error %d %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
"SO_KEEPALIVE", set, errno, strerror (errno));
close (server->sock);
server->sock = -1;
return 0;
}
/* bind */
if (bind (server->sock, (struct sockaddr *)ptr_addr, addr_size) < 0)
{
weechat_printf (NULL,
_("%s%s: cannot \"bind\" on port %d (%s): error %d %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
server->port, server->protocol_string,
errno, strerror (errno));
close (server->sock);
server->sock = -1;
return 0;
}
#ifdef SOMAXCONN
if (listen (server->sock, SOMAXCONN) != 0)
#else
if (listen (server->sock, 1) != 0)
#endif
{
weechat_printf (NULL,
_("%s%s: cannot \"listen\" on port %d (%s): error %d %s"),
weechat_prefix ("error"), RELAY_PLUGIN_NAME,
server->port, server->protocol_string,
errno, strerror (errno));
close (server->sock);
server->sock = -1;
return 0;
}
max_clients = weechat_config_integer (relay_config_network_max_clients);
if (max_clients > 0)
{
weechat_printf (
NULL,
NG_("%s: listening on port %d (relay: %s, %s, max %d client)",
"%s: listening on port %d (relay: %s, %s, max %d clients)",
max_clients),
RELAY_PLUGIN_NAME,
server->port,
server->protocol_string,
((server->ipv4 && server->ipv6) ? "IPv4+6" : ((server->ipv6) ? "IPv6" : "IPv4")),
max_clients);
}
else
{
weechat_printf (
NULL,
_("%s: listening on port %d (relay: %s, %s)"),
RELAY_PLUGIN_NAME,
server->port,
server->protocol_string,
((server->ipv4 && server->ipv6) ? "IPv4+6" : ((server->ipv6) ? "IPv6" : "IPv4")));
}
server->hook_fd = weechat_hook_fd (server->sock,
1, 0, 0,
&relay_server_sock_cb,
server, NULL);
server->start_time = time (NULL);
return 1;
}
/*
* Adds a socket relaying on a port.
*
* Returns pointer to new server, NULL if error.
*/
struct t_relay_server *
relay_server_new (const char *protocol_string, enum t_relay_protocol protocol,
const char *protocol_args, int port, int ipv4, int ipv6,
int ssl)
{
struct t_relay_server *new_server;
if (!protocol_string)
return NULL;
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_string = strdup (protocol_string);
new_server->protocol = protocol;
new_server->protocol_args =
(protocol_args) ? strdup (protocol_args) : NULL;
new_server->port = port;
new_server->ipv4 = ipv4;
new_server->ipv6 = ipv6;
new_server->ssl = ssl;
new_server->sock = -1;
new_server->hook_fd = NULL;
new_server->start_time = 0;
new_server->last_client_disconnect = 0;
relay_server_create_socket (new_server);
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;
}
/*
* Updates 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);
}
}
/*
* Removes 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_string)
free (server->protocol_string);
if (server->protocol_args)
free (server->protocol_args);
free (server);
relay_servers = new_relay_servers;
}
/*
* Removes all servers.
*/
void
relay_server_free_all ()
{
while (relay_servers)
{
relay_server_free (relay_servers);
}
}
/*
* Adds a server in an infolist.
*
* Returns:
* 1: OK
* 0: error
*/
int
relay_server_add_to_infolist (struct t_infolist *infolist,
struct t_relay_server *server)
{
struct t_infolist_item *ptr_item;
if (!infolist || !server)
return 0;
ptr_item = weechat_infolist_new_item (infolist);
if (!ptr_item)
return 0;
if (!weechat_infolist_new_var_string (ptr_item, "protocol_string", server->protocol_string))
return 0;
if (!weechat_infolist_new_var_integer (ptr_item, "protocol", server->protocol))
return 0;
if (!weechat_infolist_new_var_string (ptr_item, "protocol_args", server->protocol_args))
return 0;
if (!weechat_infolist_new_var_integer (ptr_item, "port", server->port))
return 0;
if (!weechat_infolist_new_var_integer (ptr_item, "ipv4", server->ipv4))
return 0;
if (!weechat_infolist_new_var_integer (ptr_item, "ipv6", server->ipv6))
return 0;
if (!weechat_infolist_new_var_integer (ptr_item, "ssl", server->ssl))
return 0;
if (!weechat_infolist_new_var_integer (ptr_item, "sock", server->sock))
return 0;
if (!weechat_infolist_new_var_pointer (ptr_item, "hook_fd", server->hook_fd))
return 0;
if (!weechat_infolist_new_var_time (ptr_item, "start_time", server->start_time))
return 0;
if (!weechat_infolist_new_var_time (ptr_item, "last_client_disconnect", server->last_client_disconnect))
return 0;
return 1;
}
/*
* Prints servers in WeeChat log file (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_string . . . : '%s'", ptr_server->protocol_string);
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 (" ipv4. . . . . . . . . : %d", ptr_server->ipv4);
weechat_log_printf (" ipv6. . . . . . . . . : %d", ptr_server->ipv6);
weechat_log_printf (" ssl . . . . . . . . . : %d", ptr_server->ssl);
weechat_log_printf (" sock. . . . . . . . . : %d", ptr_server->sock);
weechat_log_printf (" hook_fd . . . . . . . : 0x%lx", ptr_server->hook_fd);
weechat_log_printf (" start_time. . . . . . : %lld", (long long)ptr_server->start_time);
weechat_log_printf (" last_client_disconnect: %lld", (long long)ptr_server->last_client_disconnect);
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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