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#!/usr/bin/perl
=pod
=head1 show-conns
show-conns - Summarize information about connections to different services on the server
=head1 SYNOPSIS
show-conns [--http|--imap|--pop3|--smtp|--ftp|--cpanel|--webmail|--whm|--ssh]* [port-no port-no ...]
=head1 DESCRIPTION
Summarize information about connections to different services on the server
=head1 OPTIONS
=over 8
=item B<--http>
Show only HTTP connection details (ports 80 and 443)
=item B<--imap>
Show only IMAP connection details (ports 143, 993)
=item B<--pop3>
Show only POP3 connection details (ports 110, 995)
=item B<--smtp>
Show only SMTP connection details (ports 25, 465, 587)
=item B<--ftp>
Show only FTP connection details (ports 20, 21)
=item B<--ssh>
Show only SSH connection details (ports 22, 2222)
=item B<--webmail>
Show only Webmail connection details (ports 2095, 2096)
=item B<--cpanel>
Show only Cpanel connection details (ports 2082, 2083)
=item B<--whm>
Show only WHM connection details (ports 2086, 2087)
=item B<--all>
Show all connections on known ports (default behavior)
=item B<-f>, B<--flat>
Do not perform any tabular formatting in the output. Instead, print a flat list of ports, IPs, and connection counts. This is mainly intended for piping into other commands to extract data.
=item B<-c>, B<--count>=I<NUM>
Show the top I<NUM> IPs by connection count for each port. Defaults to 10.
=item B<-b>, B<--bleach>
Disable ANSI color escape sequences in the output
=item B<-h>, B<--help>
You know the drill
=item B<-v>, B<--version>
Ditto
=back
=cut
our $VERSION = "1.1";
use strict;
use Cwd qw( realpath );
use File::Basename;
use File::Spec::Functions;
use Getopt::Long;
use Pod::Usage;
BEGIN {
my @dir_templates = qw( %s/perl %s/../perl %s/../lib/perl );
for my $lib_template ( @dir_templates ) {
my $lib_dir = realpath( sprintf( $lib_template, dirname( __FILE__ ) ) );
if ( -d "$lib_dir/IMH/" ) {
unshift( @INC, $lib_dir );
last;
}
}
};
use IMH::ShowConns::Formatters;
use IMH::Terminal;
####################################################################################################
########################### Global Script Variable / Constant Definitions ##########################
####################################################################################################
our $show_all_ports = 1;
our %selected_ports = ();
our @port_groups = ();
our %connections = ();
our $flat = 0;
our %report_options;
####################################################################################################
###################################### Supporting Subroutines ######################################
####################################################################################################
sub select_ports {
$show_all_ports = 0;
$selected_ports{ $_ } = 1 for ( @_ );
}
####################################################################################################
############################################ Main Script ###########################################
####################################################################################################
GetOptions(
"http" => sub { select_ports( 80, 443 ); },
"imap" => sub { select_ports( 143, 993 ); },
"pop3" => sub { select_ports( 110, 995 ); },
"smtp" => sub { select_ports( 25, 587, 465 ); },
"ftp" => sub { select_ports( 20, 21 ); },
"ssh" => sub { select_ports( 22, 2222 ); },
"cpanel" => sub { select_ports( 2082, 2083 ); },
"whm" => sub { select_ports( 2086, 2087 ); },
"webmail" => sub { select_ports( 2095, 2096 ); },
"all" => sub { $show_all_ports = 1; },
"c|count=i" => sub {
my ( $opt, $val ) = @_;
$report_options{display_count} = $val;
},
"f|flat" => \$flat,
"b|bleach" => \$IMH::Terminal::bleach,
'h|help' => sub { pod2usage( 0 ); },
'v|version' => sub {
print( "$VERSION\n" );
exit( 0 );
}
);
for ( @ARGV ) {
if ( /^\d+$/ ) {
select_ports( 0 + $_ );
} else {
warn( sprintf( "Invalid script argument `%s'\n", $_ ) );
}
}
open( SS, "/usr/sbin/ss -tan |" );
while ( <SS> ) {
chomp;
my @cols = split( /\s+/ );
my ( $server, $client ) = @cols[ 3 ... 4 ];
$server =~ s(^::ffff:)()i;
$client =~ s(^::ffff:)()i;
my ( $server_ip, $server_port ) = split( /:/, $server, 2 );
if ($server_ip == '*' || $server_port == '*' || $server_ip == '0.0.0.0' || $server_ip == '127.0.0.1') {
next;
}
$server_port = 0 + $server_port;
if ( $server_port < 5000 and $show_all_ports || $selected_ports{ $server_port } ) {
my ( $client_ip, $client_port ) = split( /:/, $client, 2 );
$connections{ $server_port }->{ $client_ip }++;
}
}
close( SS );
#
# %connections should now contain a map that follows this structure:
# { port_number => { ip_address => connection_count } }
#
# So this loop starts walking through the individual stat maps and calculates
# the total number of connections for the port
#
for my $port ( keys %connections ) {
my $port_connections = $connections{ $port };
my $total = 0;
#
# get the total connection count for the port by summing up the
# individual IP connection totals
#
$total += $_ for ( values %$port_connections );
$connections{ $port } = {
total => $total,
ips => $port_connections
};
}
if ( $flat ) {
flat_report( \%connections, %report_options );
} else {
tabular_report( \%connections, %report_options );
}