#! /usr/bin/env perl use strict; use warnings; use File::Slurp; # apt install -y libfile-slurp-perl # It is difficult to tell who is on line with a UI based Linux system # as all the cli functions assume the other are logged in via cli. # # This script determines all "real users" (UUID > 1000, but not 'nobody') # and then does a ps aux to see if any of them are online. # Copyright 2024 Daily Data, Inc. # # Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following # conditions are met: # # Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. # Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer # in the documentation and/or other materials provided with the distribution. # Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived # from this software without specific prior written permission. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT # NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL # THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # define the version number # see https://metacpan.org/pod/release/JPEACOCK/version-0.97/lib/version.pod use version; our $VERSION = version->declare("0.0.1"); my @users; my @passwords = read_file( '/etc/passwd' ); while ( my $line = pop @passwords ) { next if $line =~ m/^#/; my @columns = split( ':', $line ); push @users, $columns[0] if $columns[2] >= 1000 && $columns[2] < 65534; } #print join( "\n", @users ); my $users = join( '\|', @users ); print qx/ps aux | cut -d' ' -f1 | sort | uniq | grep '$users'/; 1;