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   1 /* main.c     main entrypoint
   2  *
   3  * $Id: main.c,v 1.5 1995/03/19 17:21:06 bdale Exp $
   4  *
   5  * Copyright 1991, Michael Westerhof, Sun Microsystems, Inc.
   6  * This software may be freely used, distributed, or modified, providing
   7  * this header is not removed.
   8  *
   9  */
  10
  11 #ifdef LINUX
  12 #define __USE_BSD_SIGNAL
  13 #endif
  14 #include "ipip.h"
  15 #include "version.h"
  16 #include <stdio.h>
  17 #include <time.h>
  18 #include <string.h>
  19 #include <sys/types.h>
  20 #include <sys/time.h>
  21 #include <signal.h>
  22 #include <setjmp.h>
  23 #include <syslog.h>
  24 #include <unistd.h>
  25 #include <stdlib.h>
  26
  27 #ifdef LINUX
  28 sigjmp_buf restart_env;
  29 #else
  30 jmp_buf restart_env;
  31 #endif
  32 static void hupper(int sig);
  33 jmp_buf term_env;
  34 static void terminator();
  35
  36 char *configfile, *routefile;
  37 int version_only;
  38
  39 void
  40 main(argc, argv)
  41         int argc;
  42         char *argv[];
  43 {
  44         int n, i, oops, help;
  45         time_t now;
  46         FILE *pid_file;
  47
  48         debugd = 0;
  49         debugt = 0;
  50         help = 0;
  51         no_timestamp = 0;
  52         version_only = 0;
  53         routefile = DEFAULTROUTE;
  54         configfile = DEFAULTCONFIG;
  55         stat_interval = -1;             /* print at exit only */
  56
  57         /* let's use syslogd for all this junk... */
  58         openlog("ipip", LOG_PID | LOG_NOWAIT, IPIP_SYSLOG);
  59
  60         (void)sprintf(progname,"ipip[%d]: ",getpid());
  61
  62         /* log our pid so that we can get kicked during log rotation */
  63         if(!(pid_file = fopen(PIDLOG,"w"))) {
  64                 syslog(LOG_CRIT, "could not log pid to file %s",PIDLOG);
  65                 exit(1);
  66         }
  67         fprintf(pid_file,"%d\n",getpid());
  68         fclose(pid_file);
  69
  70         /* Process arguments */
  71         oops = 0;
  72         for(i=1;((i<argc)&&(oops==0));i++){
  73                 if(strcmp(argv[i],"-c")==0){
  74                         i++;
  75                         if(i<argc)configfile = argv[i];
  76                         else oops++;
  77                 } else if(strcmp(argv[i],"-r")==0){
  78                         i++;
  79                         if(i<argc)routefile = argv[i];
  80                         else oops++;
  81                 } else if(strcmp(argv[i],"-s")==0){
  82                         i++;
  83                         if(i<argc)stat_interval = atoi(argv[i]) * 60;
  84                         else oops++;
  85                 } else if(strcmp(argv[i],"-d")==0){
  86                         debugd++;
  87                 } else if(strcmp(argv[i],"-t")==0){
  88                         debugt++;
  89                 } else if(strcmp(argv[i],"-v")==0){
  90                         version_only++;
  91                 } else if(strcmp(argv[i],"-np")==0){
  92                         progname[0] = '\0';
  93                 } else if(strcmp(argv[i],"-nts")==0){
  94                         no_timestamp++;
  95                 } else if(strcmp(argv[i],"-help")==0){
  96                         help++;
  97                 } else oops++;
  98         }
  99
 100         if(oops){
 101                 (void)fprintf(stderr,"%sUsage: %s [-help] [-c <configfile>] [-r <routefile>] [-s <minutes>] [-np] [-nts] [-t] [-d] [-v]\n",
 102                         progname,argv[0]);
 103                 (void)printf("%sexit (syntax error)\n",progname);
 104                 exit(1);
 105         }
 106
 107         if(help){
 108                 (void)printf("%s Options are:\n",progname);
 109                 (void)printf("%s  -help      Print this summary of options\n",
 110                         progname);
 111                 (void)printf("%s  -v         Print just the version number and exit\n",
 112                         progname);
 113                 (void)printf("%s  -c file    Use the supplied filename as the config file\n",
 114                         progname);
 115                 (void)printf("%s  -r file    Use the supplied filename as the route file\n",
 116                         progname);
 117                 (void)printf("%s  -s n       Report statistics every n minutes\n",
 118                         progname);
 119                 (void)printf("%s  -np        Don't print the ipip[1234]: prefix\n",
 120                         progname);
 121                 (void)printf("%s  -nts       Don't include a timestamp in the statistics\n",
 122                         progname);
 123                 (void)printf("%s  -t         Turn on tracing of incoming packets\n",
 124                         progname);
 125                 (void)printf("%s  -d         Print out some debugging information\n",
 126                         progname);
 127                 exit(0);
 128         }
 129
 130 #ifdef NO_STRTOUL
 131         if(strtol("0xffffffff",NULL,0)!=0xffffffff){
 132                 (void)fprintf(stderr,"%sAssertion failed: this program cannot properly read\n",progname);
 133                 (void)fprintf(stderr,"%sunsigned numbers from the config files.  See the\n",progname);
 134                 (void)fprintf(stderr,"%ssource code for details.  ABORTED.\n",progname);
 135                 (void)printf("%sexit (program error)\n",progname);
 136                 exit(2);
 137         }
 138 #endif
 139
 140         if(setjmp(term_env)!=0){
 141                 send_stats(1);          /* force print of statistics */
 142                 now = time(NULL);
 143                 syslog(LOG_CRIT, "exit (killed)");
 144                 exit(0);
 145         }
 146
 147         (void)signal(SIGTERM, terminator);
 148         (void)signal(SIGINT, terminator);
 149
 150         /* Say hello to the world */
 151         syslog(LOG_DEBUG,"version %s Copyright 1991, Michael Westerhof.",VERS);
 152
 153         if(version_only!=0)exit(0);
 154
 155         /* Read the configuration file */
 156
 157         if(read_config(configfile)<0){
 158                 syslog(LOG_CRIT, "exit (config file error)");
 159                 exit(1);
 160         }
 161
 162         /* Here's where we restart when we get a SIGHUP signal */
 163 #ifdef LINUX
 164         if(sigsetjmp(restart_env,1)==0){
 165 #else
 166         if(setjmp(restart_env,1)==0){
 167 #endif
 168                 (void)signal(SIGHUP, hupper);
 169         }
 170
 171         /* make sure to close and reopen the log channel if we get a SIGHUP,
 172            since it might mean the log file was just rotated!  */
 173         closelog();
 174         openlog("ipip", LOG_PID | LOG_NOWAIT, IPIP_SYSLOG);
 175
 176         /* Read the route tables */
 177
 178         if(read_routes(routefile)<0){
 179                 syslog(LOG_CRIT, "exit (routes file error)");
 180                 exit(1);
 181         }
 182
 183         /* flush the stdout buffer before we start to run */
 184 /*      (void)fflush(stdout);   */
 185
 186         /* And run it! */
 187
 188         n = run_it();
 189         if(n<0){
 190                 syslog(LOG_CRIT, "exit (I/O error)");
 191                 exit(1);
 192         }
 193
 194         /* Should never return this way... but stuff happens... */
 195         send_stats(1);
 196         syslog(LOG_CRIT, "exit (no error code?)");
 197         exit(0);
 198 }
 199
 200 static void
 201 hupper(int sig)
 202 {
 203         syslog(LOG_DEBUG, "SIGHUP received");
 204 #ifdef LINUX
 205         siglongjmp(restart_env, 1);
 206 #else
 207         longjmp(restart_env, 1);
 208 #endif
 209 }
 210
 211 static void
 212 terminator()
 213 {
 214         longjmp(term_env, 1);
 215 }