commands/reboot/log.c

   1 /*
   2   log - log the shutdown's and the halt's
   3
   4   Author: Edvard Tuinder  <v892231@si.hhs.NL>
   5
   6   shutdown is logged in /usr/adm/wtmp and in /usr/adm/log (if desired)
   7   halt is logged only in /usr/adm/wtmp as `halt' to prevent last from
   8        reporting halt's as crashes.
   9
  10  */
  11
  12 #define _POSIX_SOURCE   1
  13 #include <sys/types.h>
  14 #include <stdio.h>
  15 #include <utmp.h>
  16 #include <pwd.h>
  17 #include <fcntl.h>
  18 #include <time.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <sys/utsname.h>
  22 #undef WTMP
  23
  24 static char WTMP[] = "/usr/adm/wtmp";   /* Record of logins and logouts. */
  25 static char SHUT_LOG[] = "/usr/adm/log";
  26
  27 char who[8];
  28 extern char *prog;
  29 static char *month[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  30                          "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
  31
  32 void write_log _ARGS(( void ));
  33
  34 void write_log()
  35 {
  36   int fd;
  37   static struct utmp wtmp;
  38   static struct passwd *pwd;
  39   char mes[90];
  40   struct tm *tm;
  41   time_t now;
  42   struct utsname utsname;
  43   char *host = "localhost";
  44
  45   time(&now);
  46   tm = localtime(&now);
  47
  48   if (uname(&utsname) >= 0) host = utsname.nodename;
  49
  50   pwd = getpwuid(getuid());
  51   if (pwd == (struct passwd *)0)
  52     strcpy (who,"root");
  53   else
  54     strcpy (who,pwd->pw_name);
  55   fd = open(WTMP,O_APPEND|O_WRONLY,1);
  56   if (fd) {
  57     if (strcmp(prog,"reboot"))
  58       strcpy (wtmp.ut_user, prog);
  59     else
  60       strcpy (wtmp.ut_user, "shutdown"); /* last ... */
  61     strcpy (wtmp.ut_id, "~~");
  62     strcpy (wtmp.ut_line, "~");
  63     wtmp.ut_pid = 0;
  64     wtmp.ut_type = BOOT_TIME;
  65     wtmp.ut_time = now;
  66     wtmp.ut_host[0]= '\0';
  67     write (fd, (char *) &wtmp,sizeof(struct utmp));
  68     close(fd);
  69   }
  70   fd = open(SHUT_LOG,O_APPEND|O_WRONLY,1);
  71   if (!fd)
  72     perror ("open");
  73   else {
  74     sprintf (mes,"%s %02d %02d:%02d:%02d %s: system %s by %s@%s\n",
  75         month[tm->tm_mon],tm->tm_mday,tm->tm_hour,tm->tm_min,tm->tm_sec,
  76         prog,prog,who,host);
  77     write (fd,mes,strlen(mes));
  78     close(fd);
  79   }
  80   return;
  81 }