Group File Problems

In this example, we report group file problems.

The GroupFileProblems script might send an alert message like the following:

                                PIKT ALERT
                         Wed Aug 13 02:19:34 2003
                                  milan

WARNING:
    GroupFileProblems
        Report group file problems

        the size of /etc/group has changed by >= 20%, was 43 lines, is now 24 lines

The script follows.

GroupFileProblems

        init
                status =piktstatus
                level =piktlevel
                task "Report group file problems"
                input proc "=sort -t: +2n =group"
                seps ":"
                =groupdata

        rule    // system group?
                set #sysgrp = #value($gid) < 100

        rule    // report bogus comment line
                if $left($group,1) eq "#"
                        output mail "Bogus comment line: $inline"
                        next
                endif

        rule    // non-root gid 0s
                if    $gid eq "0"
                   && $group ne "root"
                        output mail "Group $group has GID OF 0!"
                        output syslog "Group $group has GID OF 0!"
                endif

        rule    // no gid
                if $gid eq ""
                        output mail "Group $group has NO GID!"
                endif

        rule    // duplicate gids
                if    $gid eq @gid
                   && ! #sysgrp
                        output mail "Groups $group and @group have duplicate gids"
                endif

        end     // drastic change in group file size
                set #lines = #innum()
                if =deviated(lines, 20%)
                        output mail "the size of =group has changed by >= 20%,
                                     was $text(%lines) lines,
                                     is now $text(#lines)"
                endif

This is just one program example.  You could add rules, or write new scripts, for example to report:  illegal group names, non-existent users, malformed lines, etc.

For more examples, see Samples.