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itund/isdntun.c

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/*
* ISDN tunnel Daemon "ItunD"
*
* Copyright 2004-2006 SYSGO Real-Time Solutions AG
* Klein-Winternheim, Germany
* All rights reserved.
*
* Author: Armin Schindler <armin.schindler@sysgo.com>
*
* Copyright 2004-2006 Cytronics & Melware
*
* Armin Schindler <armin@melware.de>
*
* $Id$
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <getopt.h>
#include <syslog.h>
#include <sys/select.h>
#include "isdntun.h"
#include "options.h"
#include "signals.h"
#include "tun.h"
static char pid_file[128];
int if_fd;
int capi_fd;
int status = EXIT_OK;
int iphase = PHASE_DEAD;
void new_phase(int phase)
{
iphase = phase;
capi_new_phase(phase);
}
/*
* exit
*/
void die(int val)
{
error("die with %d", val);
itun_close(if_fd);
itun_exit();
unlink(pid_file);
exit(val);
}
/*
* usage
*/
static void usage(char *prg)
{
fprintf(stderr, "ISDN-Tunnel Daemon Version %s (c) 2004-2006 Cytronics & Melware, SYSGO AG\n", VERSION);
fprintf(stderr, "usage: %s <option> <option> ...\n", prg);
fprintf(stderr, "options:\n");
fprintf(stderr, " -D Don't daemonize into background\n");
fprintf(stderr, " -d <level> Set debug level (%d)\n", debug_level);
fprintf(stderr, " --encap=<arg> Encapsulation (ether, rawip, zipip)\n");
fprintf(stderr, " --controller=<arg> CAPI controller specification\n");
fprintf(stderr, " --ddi=<arg,len> DDI-number,DDI-length\n");
fprintf(stderr, " --protcol=<arg> Protocol (x75, hdlc)\n");
fprintf(stderr, " --number=<arg> Number to call\n");
fprintf(stderr, " (may be comma separated list)\n");
fprintf(stderr, " --numberprefix=<arg> Prefix for number\n");
fprintf(stderr, " --msn=<arg> Number to call from\n");
fprintf(stderr, " --inmsn=<arg> Called number for incoming calls\n");
fprintf(stderr, " --cli=<arg> Calling number for incoming calls\n");
fprintf(stderr, " (may be comma separated list)\n");
fprintf(stderr, " --clicb Call number and wait for callback\n");
fprintf(stderr, " --cbwait=<arg> Number of seconds to wait for callback\n");
fprintf(stderr, " --dialtimeout=<arg> Number of seconds to wait for connection\n");
fprintf(stderr, " or reject\n");
fprintf(stderr, " --dialmax=<arg> Number of dial retries\n");
fprintf(stderr, " --redialdelay=<arg> Number of seconds to wait between dial retries\n");
fprintf(stderr, " --channels=<arg> Channel to use for leased line\n");
fprintf(stderr, " (may be comma separated list)\n");
fprintf(stderr, " --cbdelay=<arg> Number of seconds to wait before calling back\n");
fprintf(stderr, " --cbnumber=<arg> Number to call (may be comma separated list)\n");
fprintf(stderr, " --connectdelay=<arg> Number of seconds to wait after connection is established\n");
fprintf(stderr, " --acceptdelay Wait 1 second before accept incoming call\n");
fprintf(stderr, " --coso=<arg> COSO: caller,local or remote\n");
fprintf(stderr, " --voicecallwakeup Call number and wait for callback\n");
fprintf(stderr, " --demand Establish connection on demand only\n");
fprintf(stderr, " --nopersist Exit after connection\n");
fprintf(stderr, " --idle=<arg> Number of idle seconds before hangup (%d)\n", opt_idle);
fprintf(stderr, " --name=<arg> Personal name for this connection\n");
fprintf(stderr, " --ifup=<arg> Script to be called when interface is up\n");
fprintf(stderr, " called with arguments <if-name> <given-name>\n");
fprintf(stderr, "\n");
}
/*
* long options list
*/
static struct option itun_options[] = {
{ "help", no_argument, NULL, 0x100 },
{ "encap", required_argument, NULL, 0x101 },
{ "controller", required_argument, NULL, 0x102 },
{ "number", required_argument, NULL, 0x103 },
{ "numberprefix", required_argument, NULL, 0x104 },
{ "msn", required_argument, NULL, 0x105 },
{ "protocol", required_argument, NULL, 0x106 },
{ "inmsn", required_argument, NULL, 0x107 },
{ "cli", required_argument, NULL, 0x108 },
{ "clicb", no_argument, NULL, 0x109 },
{ "cbwait", required_argument, NULL, 0x10A },
{ "dialtimeout", required_argument, NULL, 0x10B },
{ "dialmax", required_argument, NULL, 0x10C },
{ "redialdelay", required_argument, NULL, 0x10D },
{ "channels", required_argument, NULL, 0x10E },
{ "cbdelay", required_argument, NULL, 0x10F },
{ "cbnumber", required_argument, NULL, 0x110 },
{ "connectdelay", required_argument, NULL, 0x111 },
{ "acceptdelay", no_argument, NULL, 0x112 },
{ "coso", required_argument, NULL, 0x113 },
{ "voicecallwakup", no_argument, NULL, 0x114 },
{ "demand", no_argument, NULL, 0x115 },
{ "idle", required_argument, NULL, 0x116 },
{ "nopersist", no_argument, NULL, 0x117 },
{ "name", required_argument, NULL, 0x118 },
{ "ddi", required_argument, NULL, 0x119 },
{ "ifup", required_argument, NULL, 0x11A },
{ NULL, 0, NULL, 0 }
};
/*
* capi wants wake up
*/
void capi_wake_up(void)
{
Dialsignal = 1;
dbglog("capi_wake_up");
}
/*
* main loop of connection handling
*/
static void connection_handling(void)
{
fd_set rfds;
struct timeval tv;
int ret;
int maxfd;
FD_ZERO(&rfds);
FD_SET(capi_fd, &rfds);
maxfd = capi_fd;
if (((iphase == PHASE_RUNNING) && (data_sent)) ||
(iphase == PHASE_DORMANT)) {
FD_SET(if_fd, &rfds);
if (if_fd > capi_fd)
maxfd = if_fd;
}
tv.tv_sec = 1;
tv.tv_usec = 0;
ret = select(maxfd + 1, &rfds, NULL, NULL, &tv);
if (ret > 0) {
if (FD_ISSET(capi_fd, &rfds)) {
dbglog("capi_fd in select");
handle_capi_message();
}
if (FD_ISSET(if_fd, &rfds)) {
dbglog("if_fd in select");
if (is_connected())
handle_if_data();
else
Dialsignal = 1;
}
}
}
/*
* MAIN
*/
int main(int argc, char *argv[])
{
int c;
FILE *f;
while ((c = getopt_long(argc, argv, "?hDd:", itun_options, (int *)0)) != EOF) {
switch(c) {
case 'D': /* don't daemonize */
daemonize = 0;
break;
case 'd': /* debug level */
debug_level = strtol(optarg, NULL, 0);
break;
case 0x101: /* encap */
opt_encap = strdup(optarg);
break;
case 0x102: /* controller */
opt_controller = strdup(optarg);
break;
case 0x103: /* number */
opt_number = strdup(optarg);
break;
case 0x104: /* numberprefix */
opt_numberprefix = strdup(optarg);
break;
case 0x105: /* msn */
opt_msn = strdup(optarg);
break;
case 0x106: /* protocol */
opt_proto = strdup(optarg);
break;
case 0x107: /* inmsn */
opt_inmsn = strdup(optarg);
break;
case 0x108: /* cli */
opt_cli = strdup(optarg);
break;
case 0x109: /* clicb */
opt_cbflag = 1;
break;
case 0x10A: /* cbwait */
opt_cbwait = strtol(optarg, NULL, 0);
break;
case 0x10B: /* dialtimeout */
opt_dialtimeout = strtol(optarg, NULL, 0);
break;
case 0x10C: /* dialmax */
opt_dialmax = strtol(optarg, NULL, 0);
break;
case 0x10D: /* redialdelay */
opt_redialdelay = strtol(optarg, NULL, 0);
break;
case 0x10E: /* channels */
opt_channels = strdup(optarg);
break;
case 0x10F: /* cbdelay */
opt_cbdelay = strtol(optarg, NULL, 0);
break;
case 0x110: /* cbnumber */
opt_callbacknumber = strdup(optarg);
break;
case 0x111: /* connectdelay */
opt_connectdelay = strtol(optarg, NULL, 0);
break;
case 0x112: /* acceptdelay */
opt_acceptdelayflag = 1;
break;
case 0x113: /* coso */
opt_coso = strdup(optarg);
break;
case 0x114: /* voicecallwakeup */
opt_voicecallwakeup = 1;
break;
case 0x115: /* demand */
demand = 1;
break;
case 0x116: /* idle */
opt_idle = strtol(optarg, NULL, 0);
break;
case 0x117: /* nopersist */
opt_persist = 0;
break;
case 0x118: /* name */
opt_name = strdup(optarg);
break;
case 0x119: /* ddi */
opt_ddi = strdup(optarg);
break;
case 0x11A: /* ifup */
opt_ifup = strdup(optarg);
break;
default:
fprintf(stderr, "Unknown option %c\n", c);
/* fall through */
case 0x100: /* help */
case 'h':
case '?':
usage(argv[0]);
return(-1);
}
}
/* open syslog */
openlog("ItunD", LOG_PID, LOG_DAEMON);
if (!check_global_options()) {
usage(argv[0]);
return(-1);
}
debug_options();
signal_setup();
if ((if_fd = itun_alloc(dev_name, ether_flag)) < 0) {
perror("open alloc tun device");
return(-1);
}
if (!opt_name)
opt_name = strdup(dev_name);
if ((capi_fd = itun_init()) < 0) {
perror("init capi");
itun_close(if_fd);
return(-1);
}
if (daemonize) {
/* make us a daemon in the background */
switch(fork()) {
case 0: /* fork ok - we are the child */
close(0);
close(1);
dbglog("forked with pid %d", getpid());
syslog(LOG_INFO, "%s: started", opt_name);
break;
case -1: /* fork error */
perror("fork");
exit(errno);
break;
default: /* fork ok - parent ends here */
dbglog("child forked, parent ends.");
printf("%s\n", dev_name);
return(0);
}
} else {
syslog(LOG_INFO, "%s: started", opt_name);
printf("%s\n", dev_name);
}
/* create pid file */
snprintf(pid_file, sizeof(pid_file)-1, "/var/run/%s.pid", dev_name);
if ((f = fopen(pid_file, "w+")) != NULL) {
fprintf(f, "%d\n", getpid());
fclose(f);
}
new_phase(PHASE_DORMANT);
/* run script to "interface-up" */
if (opt_ifup) {
char ifup_script[256];
sprintf(ifup_script, "%s %s %s",
opt_ifup, dev_name, opt_name);
system(ifup_script);
}
/* if demand is not enabled, force dial */
if (!demand) {
Dialsignal = 1;
}
/* main loop */
while (!Terminate) {
if (Hupsignal) {
Hupsignal = 0;
if (iphase == PHASE_RUNNING) {
new_phase(PHASE_DEAD);
}
}
if (Dialsignal) {
Dialsignal = 0;
if (iphase == PHASE_DORMANT) {
new_phase(PHASE_SERIALCONN);
if (iphase != PHASE_RUNNING) {
/* connection not established, so we clean up IF */
empty_interface();
}
}
}
/* TODO: if the netif is down, hangup/reject call */
connection_handling();
if (iphase == PHASE_DISCONNECT) {
if (opt_persist) {
new_phase(PHASE_DORMANT);
} else {
Terminate = 1;
}
}
/* check idle time */
if ((iphase == PHASE_RUNNING) &&
(opt_idle) &&
((opt_idle + idle_last_use) < time(NULL))) {
info("idle for %d seconds, hanging up", opt_idle);
Hupsignal = 1;
}
}
new_phase(PHASE_TERMINATE);
itun_close(if_fd);
itun_exit();
unlink(pid_file);
closelog();
return(0);
}
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