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/* $Id: ax25rtd.c,v 1.8 2009/06/27 22:30:23 ralf Exp $
*
* Copyright (c) 1996 Joerg Reuter (jreuter@poboxes.com)
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* This daemon tries to learn AX.25, ARP, IP route entries by listening
* to the AX.25 traffic. It caches up to 256 entries (in "FIFO" mode)
* and saves the cache on demand or at shutdown in /var/ax25/ax25rtd/ip_routes
* and /var/ax25/ax25rtd/ax25_routes. The configuration file is
* /etc/ax25/ax25rtd.conf, you can almost everything configure
* there. See ax25rtcl.c for runtime maintainance.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#ifdef __GLIBC__
#include <net/ethernet.h>
#else
#include <linux/if_ether.h>
#endif
#include <netax25/ax25.h>
#include <netrose/rose.h>
#include <netax25/axconfig.h>
#include <netax25/axlib.h>
#include "../pathnames.h"
#include "ax25rtd.h"
const char *Version = "ax25rtd $Revision: 1.8 $";
config *Config = NULL;
int reload = 0;
ip_rt_entry *ip_routes = NULL;
int ip_routes_cnt = 0;
int ip_maxroutes = IP_MAXROUTES;
ax25_rt_entry *ax25_routes = NULL;
int ax25_routes_cnt = 0;
int ax25_maxroutes = AX25_MAXROUTES;
char ip_encaps_dev[32] = "";
char iproute2_table[32] = "";
config *dev_get_config(char *dev)
{
config *config;
for (config = Config; config; config = config->next)
if (!strcmp(config->dev, dev))
return config;
return port_get_config(dev);
}
config *port_get_config(char *port)
{
config *config;
for (config = Config; config; config = config->next)
if (!strcmp(config->port, port))
return config;
return NULL;
}
void sig_reload(int d)
{
reload = 1;
signal(SIGHUP, sig_reload);
}
void sig_debug(int d)
{
fprintf(stderr, "config:\n");
dump_config(2);
fprintf(stderr, "ip-routes:\n");
dump_ip_routes(2, 0);
fprintf(stderr, "ax25-routes:\n");
dump_ax25_routes(2, 0);
signal(SIGUSR1, sig_debug);
}
void sig_term(int d)
{
save_cache();
daemon_shutdown(0);
}
void daemon_shutdown(int reason)
{
unlink(DATA_AX25ROUTED_CTL_SOCK);
exit(reason);
}
#define FD_MAX(fd) {fd_max = (fd > fd_max? fd : fd_max); FD_SET(fd, &read_fds);}
int main(int argc, char **argv)
{
unsigned char buf[256];
int size, s, cntrl_s, cntrl_fd;
socklen_t cntrl_len;
struct sockaddr_un cntrl_addr;
fd_set read_fds, write_fds;
int fd_max;
if (ax25_config_load_ports() == 0) {
fprintf(stderr, "ax25rtd: no AX.25 port configured\n");
return 1;
}
load_config();
load_cache();
if (fork())
return 0;
if ((s = socket(PF_PACKET, SOCK_PACKET, htons(ETH_P_AX25))) == -1) {
perror("AX.25 socket");
return 1;
}
if ((cntrl_s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
perror("Control socket");
return 1;
}
unlink(DATA_AX25ROUTED_CTL_SOCK);
cntrl_addr.sun_family = AF_UNIX;
strcpy(cntrl_addr.sun_path, DATA_AX25ROUTED_CTL_SOCK);
cntrl_len =
sizeof(cntrl_addr.sun_family) +
strlen(DATA_AX25ROUTED_CTL_SOCK);
if (bind(cntrl_s, (struct sockaddr *) &cntrl_addr, cntrl_len) < 0) {
perror("bind Control socket");
daemon_shutdown(1);
}
chmod(DATA_AX25ROUTED_CTL_SOCK, 0600);
listen(cntrl_s, 1);
signal(SIGUSR1, sig_debug);
signal(SIGHUP, sig_reload);
signal(SIGTERM, sig_term);
cntrl_fd = -1;
for (;;) {
fd_max = 0;
FD_ZERO(&read_fds);
FD_ZERO(&write_fds);
FD_MAX(s);
if (cntrl_fd > 0) {
FD_MAX(cntrl_fd);
FD_SET(cntrl_fd, &write_fds);
} else {
FD_MAX(cntrl_s);
}
if (select(fd_max + 1, &read_fds, NULL, &write_fds, NULL) < 0) {
if (errno == EINTR) /* woops! */
continue;
if (!FD_ISSET(cntrl_fd, &write_fds)) {
perror("select");
save_cache();
daemon_shutdown(1);
} else {
close(cntrl_fd);
cntrl_fd = -1;
continue;
}
}
if (cntrl_fd > 0) {
if (FD_ISSET(cntrl_fd, &read_fds)) {
size = read(cntrl_fd, buf, sizeof(buf));
if (size > 0) {
buf[size] = '\0';
interpret_command(cntrl_fd, buf);
} else {
close(cntrl_fd);
cntrl_fd = -1;
}
}
} else if (FD_ISSET(cntrl_s, &read_fds)) {
if ((cntrl_fd =
accept(cntrl_s,
(struct sockaddr *) &cntrl_addr,
&cntrl_len)) < 0) {
perror("accept Control");
save_cache();
daemon_shutdown(1);
}
}
if (reload)
reload_config();
if (FD_ISSET(s, &read_fds))
ax25_receive(s);
}
return 0; /* what ?! */
}
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