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/* main.c main entrypoint
*
* $Id: main.c,v 1.5 1995/03/19 17:21:06 bdale Exp $
*
* Copyright 1991, Michael Westerhof, Sun Microsystems, Inc.
* This software may be freely used, distributed, or modified, providing
* this header is not removed.
*
*/
#ifdef LINUX
#define __USE_BSD_SIGNAL
#endif
#include "ipip.h"
#include "version.h"
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <signal.h>
#include <setjmp.h>
#include <syslog.h>
#include <unistd.h>
#include <stdlib.h>
#ifdef LINUX
sigjmp_buf restart_env;
#else
jmp_buf restart_env;
#endif
static void hupper(int sig);
jmp_buf term_env;
static void terminator();
int stat_interval;
int no_timestamp;
int debugd;
int debugt;
char progname[32];
char *configfile, *routefile;
int version_only;
int
main(argc, argv)
int argc;
char *argv[];
{
int n, i, oops, help;
FILE *pid_file;
debugd = 0;
debugt = 0;
help = 0;
no_timestamp = 0;
version_only = 0;
routefile = DEFAULTROUTE;
configfile = DEFAULTCONFIG;
stat_interval = -1; /* print at exit only */
/* let's use syslogd for all this junk... */
openlog("ipip", LOG_PID | LOG_NOWAIT, IPIP_SYSLOG);
(void)sprintf(progname,"ipip[%d]: ",getpid());
/* log our pid so that we can get kicked during log rotation */
if(!(pid_file = fopen(PIDLOG,"w"))) {
syslog(LOG_CRIT, "could not log pid to file %s",PIDLOG);
exit(1);
}
fprintf(pid_file,"%d\n",getpid());
fclose(pid_file);
/* Process arguments */
oops = 0;
for(i=1;((i<argc)&&(oops==0));i++){
if(strcmp(argv[i],"-c")==0){
i++;
if(i<argc)configfile = argv[i];
else oops++;
} else if(strcmp(argv[i],"-r")==0){
i++;
if(i<argc)routefile = argv[i];
else oops++;
} else if(strcmp(argv[i],"-s")==0){
i++;
if(i<argc)stat_interval = atoi(argv[i]) * 60;
else oops++;
} else if(strcmp(argv[i],"-d")==0){
debugd++;
} else if(strcmp(argv[i],"-t")==0){
debugt++;
} else if(strcmp(argv[i],"-v")==0){
version_only++;
} else if(strcmp(argv[i],"-np")==0){
progname[0] = '\0';
} else if(strcmp(argv[i],"-nts")==0){
no_timestamp++;
} else if(strcmp(argv[i],"-help")==0){
help++;
} else oops++;
}
if(oops){
(void)fprintf(stderr,"%sUsage: %s [-help] [-c <configfile>] [-r <routefile>] [-s <minutes>] [-np] [-nts] [-t] [-d] [-v]\n",
progname,argv[0]);
(void)printf("%sexit (syntax error)\n",progname);
exit(1);
}
if(help){
(void)printf("%s Options are:\n",progname);
(void)printf("%s -help Print this summary of options\n",
progname);
(void)printf("%s -v Print just the version number and exit\n",
progname);
(void)printf("%s -c file Use the supplied filename as the config file\n",
progname);
(void)printf("%s -r file Use the supplied filename as the route file\n",
progname);
(void)printf("%s -s n Report statistics every n minutes\n",
progname);
(void)printf("%s -np Don't print the ipip[1234]: prefix\n",
progname);
(void)printf("%s -nts Don't include a timestamp in the statistics\n",
progname);
(void)printf("%s -t Turn on tracing of incoming packets\n",
progname);
(void)printf("%s -d Print out some debugging information\n",
progname);
exit(0);
}
#ifdef NO_STRTOUL
if(strtol("0xffffffff",NULL,0)!=0xffffffff){
(void)fprintf(stderr,"%sAssertion failed: this program cannot properly read\n",progname);
(void)fprintf(stderr,"%sunsigned numbers from the config files. See the\n",progname);
(void)fprintf(stderr,"%ssource code for details. ABORTED.\n",progname);
(void)printf("%sexit (program error)\n",progname);
exit(2);
}
#endif
if(setjmp(term_env)!=0){
send_stats(1); /* force print of statistics */
syslog(LOG_CRIT, "exit (killed)");
exit(0);
}
(void)signal(SIGTERM, terminator);
(void)signal(SIGINT, terminator);
/* Say hello to the world */
syslog(LOG_DEBUG,"version %s Copyright 1991, Michael Westerhof.",VERS);
if(version_only!=0)exit(0);
/* Read the configuration file */
if(read_config(configfile)<0){
syslog(LOG_CRIT, "exit (config file error)");
exit(1);
}
/* Here's where we restart when we get a SIGHUP signal */
#ifdef LINUX
if(sigsetjmp(restart_env,1)==0){
#else
if(setjmp(restart_env,1)==0){
#endif
(void)signal(SIGHUP, hupper);
}
/* make sure to close and reopen the log channel if we get a SIGHUP,
since it might mean the log file was just rotated! */
closelog();
openlog("ipip", LOG_PID | LOG_NOWAIT, IPIP_SYSLOG);
/* Read the route tables */
if(read_routes(routefile)<0){
syslog(LOG_CRIT, "exit (routes file error)");
exit(1);
}
/* flush the stdout buffer before we start to run */
/* (void)fflush(stdout); */
/* And run it! */
n = run_it();
if(n<0){
syslog(LOG_CRIT, "exit (I/O error)");
exit(1);
}
/* Should never return this way... but stuff happens... */
send_stats(1);
syslog(LOG_CRIT, "exit (no error code?)");
exit(0);
}
static void
hupper(int sig)
{
syslog(LOG_DEBUG, "SIGHUP received");
#ifdef LINUX
siglongjmp(restart_env, 1);
#else
longjmp(restart_env, 1);
#endif
}
static void
terminator()
{
longjmp(term_env, 1);
}
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