2002-02-18 16:25:19 +00:00
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/*
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net_socket.c -- Handle various kinds of sockets.
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2003-07-12 17:41:48 +00:00
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Copyright (C) 1998-2003 Ivo Timmermans <ivo@o2w.nl>,
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2000-2003 Guus Sliepen <guus@sliepen.eu.org>
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2002-02-18 16:25:19 +00:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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2003-07-12 17:41:48 +00:00
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$Id: net_socket.c,v 1.1.2.26 2003/07/12 17:41:46 guus Exp $
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2002-02-18 16:25:19 +00:00
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*/
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#include "config.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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/* SunOS really wants sys/socket.h BEFORE net/if.h,
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and FreeBSD wants these lines below the rest. */
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <net/if.h>
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2002-09-15 14:55:54 +00:00
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#ifdef HAVE_NETINET_IN_SYSTM_H
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#include <netinet/in_systm.h>
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#endif
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#ifdef HAVE_NETINET_IP_H
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#include <netinet/ip.h>
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#endif
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#ifdef HAVE_NETINET_TCP_H
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#include <netinet/tcp.h>
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#endif
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2002-02-18 16:25:19 +00:00
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#include <utils.h>
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#include <xalloc.h>
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#include <avl_tree.h>
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#include <list.h>
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#include "conf.h"
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#include "connection.h"
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#include "meta.h"
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#include "net.h"
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#include "netutl.h"
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#include "process.h"
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#include "protocol.h"
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#include "subnet.h"
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2002-09-04 13:48:52 +00:00
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#include "graph.h"
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2002-02-18 16:25:19 +00:00
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#include "process.h"
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#include "route.h"
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#include "device.h"
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#include "event.h"
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2003-07-06 22:11:37 +00:00
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#include "logger.h"
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2002-02-18 16:25:19 +00:00
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#include "system.h"
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2002-04-18 20:09:05 +00:00
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#ifndef HAVE_RAND_PSEUDO_BYTES
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#define RAND_pseudo_bytes RAND_bytes
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#endif
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2003-06-11 19:27:35 +00:00
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int addressfamily = AF_UNSPEC;
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2002-02-18 16:25:19 +00:00
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int maxtimeout = 900;
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int seconds_till_retry = 5;
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2002-03-18 22:47:20 +00:00
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listen_socket_t listen_socket[MAXSOCKETS];
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2002-06-13 16:12:40 +00:00
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int listen_sockets;
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2002-02-26 23:26:41 +00:00
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2002-02-18 16:25:19 +00:00
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/* Setup sockets */
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2002-09-09 22:33:31 +00:00
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int setup_listen_socket(sockaddr_t *sa)
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2002-02-18 16:25:19 +00:00
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{
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2002-09-09 21:25:28 +00:00
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int nfd, flags;
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char *addrstr;
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int option;
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2002-03-01 15:14:29 +00:00
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#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
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2002-09-09 21:25:28 +00:00
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char *interface;
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struct ifreq ifr;
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2002-02-18 16:25:19 +00:00
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#endif
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2002-09-09 19:40:12 +00:00
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2002-09-09 21:25:28 +00:00
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cp();
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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if(nfd < 0) {
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2003-07-12 17:41:48 +00:00
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logger(LOG_ERR, _("Creating metasocket failed: %s"), strerror(errno));
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2002-09-09 21:25:28 +00:00
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return -1;
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}
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flags = fcntl(nfd, F_GETFL);
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if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
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close(nfd);
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2003-07-12 17:41:48 +00:00
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logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
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2002-09-09 21:25:28 +00:00
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strerror(errno));
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return -1;
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}
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/* Optimize TCP settings */
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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option = 1;
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setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
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2002-03-01 15:14:29 +00:00
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#if defined(SOL_TCP) && defined(TCP_NODELAY)
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2002-09-09 21:25:28 +00:00
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setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
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2002-03-01 15:14:29 +00:00
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#endif
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2002-02-18 16:25:19 +00:00
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2002-03-01 15:14:29 +00:00
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#if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
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2002-09-09 21:25:28 +00:00
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option = IPTOS_LOWDELAY;
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setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option));
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2002-03-01 15:14:29 +00:00
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#endif
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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if(get_config_string
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(lookup_config(config_tree, "BindToInterface"), &interface)) {
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2002-03-01 15:14:29 +00:00
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#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
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2002-09-09 21:25:28 +00:00
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ);
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if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
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close(nfd);
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2003-07-12 17:41:48 +00:00
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logger(LOG_ERR, _("Can't bind to interface %s: %s"), interface,
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2002-09-09 21:25:28 +00:00
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strerror(errno));
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return -1;
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}
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2002-03-01 15:14:29 +00:00
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#else
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2003-07-12 17:41:48 +00:00
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logger(LOG_WARNING, _("BindToInterface not supported on this platform"));
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2002-02-18 16:25:19 +00:00
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#endif
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2002-09-09 21:25:28 +00:00
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}
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if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
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close(nfd);
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addrstr = sockaddr2hostname(sa);
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2003-07-12 17:41:48 +00:00
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logger(LOG_ERR, _("Can't bind to %s/tcp: %s"), addrstr,
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2002-09-09 21:25:28 +00:00
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strerror(errno));
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free(addrstr);
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return -1;
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}
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if(listen(nfd, 3)) {
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close(nfd);
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2003-07-12 17:41:48 +00:00
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logger(LOG_ERR, _("System call `%s' failed: %s"), "listen",
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2002-09-09 21:25:28 +00:00
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strerror(errno));
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return -1;
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}
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return nfd;
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2002-02-18 16:25:19 +00:00
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}
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2002-09-09 22:33:31 +00:00
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int setup_vpn_in_socket(sockaddr_t *sa)
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2002-02-18 16:25:19 +00:00
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{
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2002-09-09 21:25:28 +00:00
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int nfd, flags;
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char *addrstr;
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int option;
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2002-03-01 15:14:29 +00:00
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#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
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2002-09-09 21:25:28 +00:00
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char *interface;
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struct ifreq ifr;
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2002-02-18 16:25:19 +00:00
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#endif
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2002-09-09 21:25:28 +00:00
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cp();
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nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
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if(nfd < 0) {
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2003-07-12 17:41:48 +00:00
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logger(LOG_ERR, _("Creating UDP socket failed: %s"), strerror(errno));
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2002-09-09 21:25:28 +00:00
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return -1;
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}
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flags = fcntl(nfd, F_GETFL);
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if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
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close(nfd);
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2003-07-12 17:41:48 +00:00
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logger(LOG_ERR, _("System call `%s' failed: %s"), "fcntl",
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2002-09-09 21:25:28 +00:00
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strerror(errno));
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return -1;
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}
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option = 1;
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setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
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2002-03-01 15:14:29 +00:00
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#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
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2002-09-09 21:25:28 +00:00
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if(get_config_string
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(lookup_config(config_tree, "BindToInterface"), &interface)) {
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ);
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if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr))) {
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close(nfd);
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2003-07-12 17:41:48 +00:00
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logger(LOG_ERR, _("Can't bind to interface %s: %s"), interface,
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2002-09-09 21:25:28 +00:00
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strerror(errno));
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return -1;
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}
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2002-03-01 11:18:34 +00:00
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}
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2002-02-18 16:25:19 +00:00
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#endif
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2002-09-09 21:25:28 +00:00
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if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
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close(nfd);
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addrstr = sockaddr2hostname(sa);
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2003-07-12 17:41:48 +00:00
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logger(LOG_ERR, _("Can't bind to %s/udp: %s"), addrstr,
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2002-09-09 21:25:28 +00:00
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strerror(errno));
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free(addrstr);
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return -1;
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}
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return nfd;
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2002-02-18 16:25:19 +00:00
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}
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2002-09-09 22:33:31 +00:00
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void retry_outgoing(outgoing_t *outgoing)
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2002-02-18 16:25:19 +00:00
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{
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2002-09-09 21:25:28 +00:00
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event_t *event;
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cp();
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outgoing->timeout += 5;
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if(outgoing->timeout > maxtimeout)
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outgoing->timeout = maxtimeout;
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event = new_event();
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event->handler = (event_handler_t) setup_outgoing_connection;
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event->time = now + outgoing->timeout;
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event->data = outgoing;
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event_add(event);
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2003-07-12 17:41:48 +00:00
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ifdebug(CONNECTIONS) logger(LOG_NOTICE,
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2002-09-09 21:25:28 +00:00
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_("Trying to re-establish outgoing connection in %d seconds"),
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outgoing->timeout);
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2002-02-18 16:25:19 +00:00
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}
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2002-09-09 22:33:31 +00:00
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void finish_connecting(connection_t *c)
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2002-02-18 16:25:19 +00:00
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{
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2002-09-09 21:25:28 +00:00
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cp();
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2003-07-12 17:41:48 +00:00
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ifdebug(CONNECTIONS) logger(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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c->last_ping_time = now;
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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send_id(c);
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2002-02-18 16:25:19 +00:00
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}
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2002-09-09 22:33:31 +00:00
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void do_outgoing_connection(connection_t *c)
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2002-02-18 16:25:19 +00:00
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{
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2002-09-09 21:25:28 +00:00
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char *address, *port;
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int option, result, flags;
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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cp();
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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begin:
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if(!c->outgoing->ai) {
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if(!c->outgoing->cfg) {
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2003-07-12 17:41:48 +00:00
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ifdebug(CONNECTIONS) logger(LOG_ERR, _("Could not set up a meta connection to %s"),
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2002-09-09 21:25:28 +00:00
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c->name);
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c->status.remove = 1;
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retry_outgoing(c->outgoing);
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return;
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}
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get_config_string(c->outgoing->cfg, &address);
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if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
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asprintf(&port, "655");
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c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
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free(address);
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free(port);
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c->outgoing->aip = c->outgoing->ai;
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c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
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}
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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if(!c->outgoing->aip) {
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freeaddrinfo(c->outgoing->ai);
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c->outgoing->ai = NULL;
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goto begin;
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}
|
2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
|
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memcpy(&c->address, c->outgoing->aip->ai_addr,
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c->outgoing->aip->ai_addrlen);
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c->outgoing->aip = c->outgoing->aip->ai_next;
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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if(c->hostname)
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free(c->hostname);
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2002-02-18 16:25:19 +00:00
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2002-09-09 21:25:28 +00:00
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c->hostname = sockaddr2hostname(&c->address);
|
2002-02-18 16:25:19 +00:00
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2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(CONNECTIONS) logger(LOG_INFO, _("Trying to connect to %s (%s)"), c->name,
|
2002-09-09 21:25:28 +00:00
|
|
|
c->hostname);
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(c->socket == -1) {
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(CONNECTIONS) logger(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname,
|
2002-09-09 21:25:28 +00:00
|
|
|
strerror(errno));
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
goto begin;
|
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Optimize TCP settings */
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-06-08 12:57:10 +00:00
|
|
|
#if defined(SOL_TCP) && defined(TCP_NODELAY)
|
2002-09-09 21:25:28 +00:00
|
|
|
option = 1;
|
|
|
|
setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
|
2002-06-08 12:57:10 +00:00
|
|
|
#endif
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-06-08 12:57:10 +00:00
|
|
|
#if defined(SOL_IP) && defined(IP_TOS)
|
2002-09-09 21:25:28 +00:00
|
|
|
option = IPTOS_LOWDELAY;
|
|
|
|
setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
|
2002-02-18 16:25:19 +00:00
|
|
|
#endif
|
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Non-blocking */
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
flags = fcntl(c->socket, F_GETFL);
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
|
2003-07-12 17:41:48 +00:00
|
|
|
logger(LOG_ERR, _("fcntl for %s: %s"), c->hostname, strerror(errno));
|
2002-09-09 21:25:28 +00:00
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
/* Connect */
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
if(result == -1) {
|
|
|
|
if(errno == EINPROGRESS) {
|
|
|
|
c->status.connecting = 1;
|
|
|
|
return;
|
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
close(c->socket);
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(CONNECTIONS) logger(LOG_ERR, _("%s: %s"), c->hostname, strerror(errno));
|
2002-09-09 21:25:28 +00:00
|
|
|
|
|
|
|
goto begin;
|
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
finish_connecting(c);
|
2002-02-18 16:25:19 +00:00
|
|
|
|
2002-09-09 21:25:28 +00:00
|
|
|
return;
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
2002-09-09 22:33:31 +00:00
|
|
|
void setup_outgoing_connection(outgoing_t *outgoing)
|
2002-02-18 16:25:19 +00:00
|
|
|
{
|
2002-09-09 21:25:28 +00:00
|
|
|
connection_t *c;
|
|
|
|
node_t *n;
|
|
|
|
|
|
|
|
cp();
|
|
|
|
|
|
|
|
n = lookup_node(outgoing->name);
|
|
|
|
|
|
|
|
if(n)
|
|
|
|
if(n->connection) {
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(CONNECTIONS) logger(LOG_INFO, _("Already connected to %s"), outgoing->name);
|
2002-09-09 21:25:28 +00:00
|
|
|
|
|
|
|
n->connection->outgoing = outgoing;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
c = new_connection();
|
|
|
|
c->name = xstrdup(outgoing->name);
|
|
|
|
c->outcipher = myself->connection->outcipher;
|
|
|
|
c->outdigest = myself->connection->outdigest;
|
|
|
|
c->outmaclength = myself->connection->outmaclength;
|
|
|
|
c->outcompression = myself->connection->outcompression;
|
|
|
|
|
|
|
|
init_configuration(&c->config_tree);
|
|
|
|
read_connection_config(c);
|
|
|
|
|
|
|
|
outgoing->cfg = lookup_config(c->config_tree, "Address");
|
|
|
|
|
|
|
|
if(!outgoing->cfg) {
|
2003-07-12 17:41:48 +00:00
|
|
|
logger(LOG_ERR, _("No address specified for %s"), c->name);
|
2002-09-09 21:25:28 +00:00
|
|
|
free_connection(c);
|
|
|
|
free(outgoing->name);
|
|
|
|
free(outgoing);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
c->outgoing = outgoing;
|
|
|
|
c->last_ping_time = now;
|
|
|
|
|
|
|
|
connection_add(c);
|
|
|
|
|
|
|
|
do_outgoing_connection(c);
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
accept a new tcp connect and create a
|
|
|
|
new connection
|
|
|
|
*/
|
2002-02-26 23:26:41 +00:00
|
|
|
int handle_new_meta_connection(int sock)
|
2002-02-18 16:25:19 +00:00
|
|
|
{
|
2002-09-09 21:25:28 +00:00
|
|
|
connection_t *c;
|
|
|
|
sockaddr_t sa;
|
|
|
|
int fd, len = sizeof(sa);
|
|
|
|
|
|
|
|
cp();
|
|
|
|
|
|
|
|
fd = accept(sock, &sa.sa, &len);
|
|
|
|
|
|
|
|
if(fd < 0) {
|
2003-07-12 17:41:48 +00:00
|
|
|
logger(LOG_ERR, _("Accepting a new connection failed: %s"),
|
2002-09-09 21:25:28 +00:00
|
|
|
strerror(errno));
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
sockaddrunmap(&sa);
|
|
|
|
|
|
|
|
c = new_connection();
|
|
|
|
c->outcipher = myself->connection->outcipher;
|
|
|
|
c->outdigest = myself->connection->outdigest;
|
|
|
|
c->outmaclength = myself->connection->outmaclength;
|
|
|
|
c->outcompression = myself->connection->outcompression;
|
|
|
|
|
|
|
|
c->address = sa;
|
|
|
|
c->hostname = sockaddr2hostname(&sa);
|
|
|
|
c->socket = fd;
|
|
|
|
c->last_ping_time = now;
|
|
|
|
|
2003-07-12 17:41:48 +00:00
|
|
|
ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection from %s"), c->hostname);
|
2002-09-09 21:25:28 +00:00
|
|
|
|
|
|
|
connection_add(c);
|
|
|
|
|
|
|
|
c->allow_request = ID;
|
|
|
|
send_id(c);
|
|
|
|
|
|
|
|
return 0;
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void try_outgoing_connections(void)
|
|
|
|
{
|
2002-09-09 21:25:28 +00:00
|
|
|
static config_t *cfg = NULL;
|
|
|
|
char *name;
|
|
|
|
outgoing_t *outgoing;
|
|
|
|
|
|
|
|
cp();
|
|
|
|
|
|
|
|
for(cfg = lookup_config(config_tree, "ConnectTo"); cfg;
|
|
|
|
cfg = lookup_config_next(config_tree, cfg)) {
|
|
|
|
get_config_string(cfg, &name);
|
|
|
|
|
|
|
|
if(check_id(name)) {
|
2003-07-12 17:41:48 +00:00
|
|
|
logger(LOG_ERR,
|
2002-09-09 21:25:28 +00:00
|
|
|
_("Invalid name for outgoing connection in %s line %d"),
|
|
|
|
cfg->file, cfg->line);
|
|
|
|
free(name);
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
outgoing = xmalloc_and_zero(sizeof(*outgoing));
|
|
|
|
outgoing->name = name;
|
|
|
|
setup_outgoing_connection(outgoing);
|
|
|
|
}
|
2002-02-18 16:25:19 +00:00
|
|
|
}
|