expect による SMTPD の死活監視設定。

これは 25 番ポートの監視なので実際のデーモンチェックとはいかないかも。

-------------------------------------------------
# don't echo the dialog
log_user 0

spawn telnet localhost 25
expect {
    "Connected to" {}
    default {
        # try to restart
        # use catch so we don't report errors on the exec,
        # only on the dialog itself
        catch {exec /etc/rc.d/init.d/sendmail restart >&/dev/null} result
        sleep 5
        # redo test, fail if get an error again
        spawn telnet localhost 25
        expect {
            "Connected to" {}
            default {
                flush stdout;
                exit 1;
            }
        }
    }
}

expect {
    "220 " {}
    default { # fail if we're not greeted properly
        flush stdout;
        exit 2;
    }
}

send "QUIT\r"
expect {
    "221 " {}
    default { # fail if we're not ack-ed properly
        flush stdout;
        exit 3;
    }
}

flush stdout;
exit 0;
-------------------------------------------------