[Mimedefang] monitor scripts for mimedefang/sendmail

[Rick Mallett]

Here's one that's untested and unused. Actually, I did do some
testing, and I think its pretty good, but we stopped having problems
with mimedefang dying before I could get it into use, and I simply
haven't had time to install it. Call it restart-mimedefang.c and
compile (on Solaris) using

  gcc -o restart-mimedefang restart-mimedefang.c -lgen

#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <regexpr.h>

#define PROBLEM "Connection refused by /var/spool/MIMEDefang/mimedefang.sock$"

main (int argc, char *argv[])
{
  FILE *f;
  char *exp;
  pid_t pid;
  int wstatus;
  char *args[2];
  char buffer [1024];
  char mailfile[] = "/var/adm/mail";

  if ((f = fopen (mailfile, "r")) == NULL) {
    fprintf (stderr, "Unable to open file %s\n",mailfile);
    exit (1);
  }

  if ((exp = compile(PROBLEM, (char *)0, (char *)0)) == (char *)0) {
    fprintf(stderr, "Failed to compile regular expression.\n");
    exit(1);
  }

  args[0] = "restart-mimedefang";
  args[1] = (char *)0;

  fseek(f, SEEK_END, 0L);

  while (1) {
    sleep (5);
    if (-1 == fseek (f, SEEK_CUR, 1)) {
      fprintf (stderr, "Unexpected fseek failure.\n");
      exit (1);
    }
    fgets (buffer, 1024, f);
    while (!feof(f)) {
      buffer [strlen (buffer) - 1] = 0;
      if (step(buffer,exp)) {
        pid = fork();
        switch (pid) {
        case -1:
          fprintf(stderr, "System failure - unable to fork a process.\n");
          exit(1);
        case 0:  /* child */
          execv("/usr/local/bin/restart-mimedefang", args);
          fprintf(stderr, "System failure - unexpected return from execv.\n");
          exit(1);
        default:  /* parent */
          waitpid(pid, &wstatus, 0); /* wait for child */
          if(WEXITSTATUS(wstatus) != 0 || WTERMSIG(wstatus) > 0)  { /* error return */
            fprintf(stderr, "System failure - wait exit status %d.\n",wstatus);
            exit(1);
          }
        }
      }
      fgets (buffer, 1024, f);
    }
  }
}

- rick

On Tue, 3 Feb 2004, Lucas Albers wrote:

> I would be interested in any swatch scripts or other monitor scripts
> people use to watch mimedefang/sendmail and restart it if it dies.
> I currently do not use a log monitor script to determine when
> mimedefang/sendmail dies.
> I use the monit program which just tells me that the program is accepting
> connections, and the process is running.
> I would like to configure a finer grained monitor of mimedefang/sendmail
> so I can restart them when they have problems.
> Or at least get emailed.
>
> I'm considering all I need to do is swatch the log for milter timeout or
> similar, and then do a restart.
> By why invent the wheel when someone else already has...
>
>
> Luke Computer Science System Administrator
>
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