git.gag.com Git - debian/ipip/blob - main.c

   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 int stat_interval;
  36 int no_timestamp;
  37 int debugd;
  38 int debugt;
  39
  40 char progname[32];
  41 char *configfile, *routefile;
  42 int version_only;
  43
  44 int
  45 main(argc, argv)
  46         int argc;
  47         char *argv[];
  48 {
  49         int n, i, oops, help;
  50         FILE *pid_file;
  51
  52         debugd = 0;
  53         debugt = 0;
  54         help = 0;
  55         no_timestamp = 0;
  56         version_only = 0;
  57         routefile = DEFAULTROUTE;
  58         configfile = DEFAULTCONFIG;
  59         stat_interval = -1;             /* print at exit only */
  60
  61         /* let's use syslogd for all this junk... */
  62         openlog("ipip", LOG_PID | LOG_NOWAIT, IPIP_SYSLOG);
  63
  64         (void)sprintf(progname,"ipip[%d]: ",getpid());
  65
  66         /* log our pid so that we can get kicked during log rotation */
  67         if(!(pid_file = fopen(PIDLOG,"w"))) {
  68                 syslog(LOG_CRIT, "could not log pid to file %s",PIDLOG);
  69                 exit(1);
  70         }
  71         fprintf(pid_file,"%d\n",getpid());
  72         fclose(pid_file);
  73
  74         /* Process arguments */
  75         oops = 0;
  76         for(i=1;((i<argc)&&(oops==0));i++){
  77                 if(strcmp(argv[i],"-c")==0){
  78                         i++;
  79                         if(i<argc)configfile = argv[i];
  80                         else oops++;
  81                 } else if(strcmp(argv[i],"-r")==0){
  82                         i++;
  83                         if(i<argc)routefile = argv[i];
  84                         else oops++;
  85                 } else if(strcmp(argv[i],"-s")==0){
  86                         i++;
  87                         if(i<argc)stat_interval = atoi(argv[i]) * 60;
  88                         else oops++;
  89                 } else if(strcmp(argv[i],"-d")==0){
  90                         debugd++;
  91                 } else if(strcmp(argv[i],"-t")==0){
  92                         debugt++;
  93                 } else if(strcmp(argv[i],"-v")==0){
  94                         version_only++;
  95                 } else if(strcmp(argv[i],"-np")==0){
  96                         progname[0] = '\0';
  97                 } else if(strcmp(argv[i],"-nts")==0){
  98                         no_timestamp++;
  99                 } else if(strcmp(argv[i],"-help")==0){
 100                         help++;
 101                 } else oops++;
 102         }
 103
 104         if(oops){
 105                 (void)fprintf(stderr,"%sUsage: %s [-help] [-c <configfile>] [-r <routefile>] [-s <minutes>] [-np] [-nts] [-t] [-d] [-v]\n",
 106                         progname,argv[0]);
 107                 (void)printf("%sexit (syntax error)\n",progname);
 108                 exit(1);
 109         }
 110
 111         if(help){
 112                 (void)printf("%s Options are:\n",progname);
 113                 (void)printf("%s  -help      Print this summary of options\n",
 114                         progname);
 115                 (void)printf("%s  -v         Print just the version number and exit\n",
 116                         progname);
 117                 (void)printf("%s  -c file    Use the supplied filename as the config file\n",
 118                         progname);
 119                 (void)printf("%s  -r file    Use the supplied filename as the route file\n",
 120                         progname);
 121                 (void)printf("%s  -s n       Report statistics every n minutes\n",
 122                         progname);
 123                 (void)printf("%s  -np        Don't print the ipip[1234]: prefix\n",
 124                         progname);
 125                 (void)printf("%s  -nts       Don't include a timestamp in the statistics\n",
 126                         progname);
 127                 (void)printf("%s  -t         Turn on tracing of incoming packets\n",
 128                         progname);
 129                 (void)printf("%s  -d         Print out some debugging information\n",
 130                         progname);
 131                 exit(0);
 132         }
 133
 134 #ifdef NO_STRTOUL
 135         if(strtol("0xffffffff",NULL,0)!=0xffffffff){
 136                 (void)fprintf(stderr,"%sAssertion failed: this program cannot properly read\n",progname);
 137                 (void)fprintf(stderr,"%sunsigned numbers from the config files.  See the\n",progname);
 138                 (void)fprintf(stderr,"%ssource code for details.  ABORTED.\n",progname);
 139                 (void)printf("%sexit (program error)\n",progname);
 140                 exit(2);
 141         }
 142 #endif
 143
 144         if(setjmp(term_env)!=0){
 145                 send_stats(1);          /* force print of statistics */
 146                 syslog(LOG_CRIT, "exit (killed)");
 147                 exit(0);
 148         }
 149
 150         (void)signal(SIGTERM, terminator);
 151         (void)signal(SIGINT, terminator);
 152
 153         /* Say hello to the world */
 154         syslog(LOG_DEBUG,"version %s Copyright 1991, Michael Westerhof.",VERS);
 155
 156         if(version_only!=0)exit(0);
 157
 158         /* Read the configuration file */
 159
 160         if(read_config(configfile)<0){
 161                 syslog(LOG_CRIT, "exit (config file error)");
 162                 exit(1);
 163         }
 164
 165         /* Here's where we restart when we get a SIGHUP signal */
 166 #ifdef LINUX
 167         if(sigsetjmp(restart_env,1)==0){
 168 #else
 169         if(setjmp(restart_env,1)==0){
 170 #endif
 171                 (void)signal(SIGHUP, hupper);
 172         }
 173
 174         /* make sure to close and reopen the log channel if we get a SIGHUP,
 175            since it might mean the log file was just rotated!  */
 176         closelog();
 177         openlog("ipip", LOG_PID | LOG_NOWAIT, IPIP_SYSLOG);
 178
 179         /* Read the route tables */
 180
 181         if(read_routes(routefile)<0){
 182                 syslog(LOG_CRIT, "exit (routes file error)");
 183                 exit(1);
 184         }
 185
 186         /* flush the stdout buffer before we start to run */
 187 /*      (void)fflush(stdout);   */
 188
 189         /* And run it! */
 190
 191         n = run_it();
 192         if(n<0){
 193                 syslog(LOG_CRIT, "exit (I/O error)");
 194                 exit(1);
 195         }
 196
 197         /* Should never return this way... but stuff happens... */
 198         send_stats(1);
 199         syslog(LOG_CRIT, "exit (no error code?)");
 200         exit(0);
 201 }
 202
 203 static void
 204 hupper(int sig)
 205 {
 206         syslog(LOG_DEBUG, "SIGHUP received");
 207 #ifdef LINUX
 208         siglongjmp(restart_env, 1);
 209 #else
 210         longjmp(restart_env, 1);
 211 #endif
 212 }
 213
 214 static void
 215 terminator()
 216 {
 217         longjmp(term_env, 1);
 218 }