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
  23 static char SHUT_LOG[] = "/usr/adm/log";
  24
  25 char who[8];
  26 extern char *prog;
  27 static char *month[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  28                          "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
  29
  30 void write_log(char *wtmpfile)
  31 {
  32   int fd;
  33   static struct utmp wtmp;
  34   static struct passwd *pwd;
  35   char mes[90];
  36   struct tm *tm;
  37   time_t now;
  38   struct utsname utsname;
  39   char *host = "localhost";
  40
  41   time(&now);
  42   tm = localtime(&now);
  43
  44   if (uname(&utsname) >= 0) host = utsname.nodename;
  45
  46   pwd = getpwuid(getuid());
  47   if (pwd == (struct passwd *)0)
  48     strcpy (who,"root");
  49   else
  50     strcpy (who,pwd->pw_name);
  51   fd = open(wtmpfile,O_APPEND|O_WRONLY|O_CREAT,1);
  52   if (fd) {
  53     if (strcmp(prog,"reboot"))
  54 #ifdef __NBSD_LIBC
  55       strcpy (wtmp.ut_name, prog);
  56 #else
  57       strcpy (wtmp.ut_user, prog);
  58 #endif
  59     else
  60 #ifdef __NBSD_LIBC
  61       strcpy (wtmp.ut_name, "shutdown"); /* last ... */
  62 #else
  63       strcpy (wtmp.ut_user, "shutdown"); /* last ... */
  64 #endif
  65     strcpy (wtmp.ut_id, "~~");
  66     strcpy (wtmp.ut_line, "~");
  67     wtmp.ut_pid = 0;
  68     wtmp.ut_type = BOOT_TIME;
  69     wtmp.ut_time = now;
  70     wtmp.ut_host[0]= '\0';
  71     write (fd, (char *) &wtmp,sizeof(struct utmp));
  72     close(fd);
  73   }
  74   fd = open(SHUT_LOG,O_APPEND|O_WRONLY,1);
  75   if (!fd)
  76     perror ("open");
  77   else {
  78     sprintf (mes,"%s %02d %02d:%02d:%02d %s: system %s by %s@%s\n",
  79         month[tm->tm_mon],tm->tm_mday,tm->tm_hour,tm->tm_min,tm->tm_sec,
  80         prog,prog,who,host);
  81     write (fd,mes,strlen(mes));
  82     close(fd);
  83   }
  84   return;
  85 }