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#!/usr/bin/perl -w
#+##############################################################################
# #
# File: big_brother.perl #
# #
# Description: check the network sockets with lsof to detect new connections #
# #
# Contributed by Lionel Cons <Lionel.Cons@cern.ch> #
# #
#-##############################################################################
# @(#)big_brother 1.12 08/14/96 Written by Lionel.Cons@cern.ch
# no waranty! use this at your own risks!
#
# init & setup
#
$verbose = 1;
$lsof_opt = "-itcp -iudp -Di -FcLPn -r 5";
$SIG{'HUP'} = \&hangup;
chop($hostname = `/bin/hostname`);
$fq_hostname = (gethostbyname($hostname))[0];
# Set path to lsof.
if (($LSOF = &isexec("../lsof")) eq "") { # Try .. first
if (($LSOF = &isexec("lsof")) eq "") { # Then try . and $PATH
print "can't execute $LSOF\n"; exit 1
}
}
#
# spy forever...
#
$| = 1;
die "$LSOF is not executable\n" unless -x $LSOF;
while (1) {
$lsof_pid = open(PIPE, "$LSOF $lsof_opt 2>&1 |")
|| die "can't start $LSOF: $!\n";
print "# ", ×tamp, " $LSOF $lsof_opt, pid=$lsof_pid\n"
if $verbose;
print "#COMMAND PID USER P NAME\n";
$printed = $hanguped = $pid = $proto = 0;
while (<PIPE>) {
if (/^lsof: PID \d+, /) {
# fatal error message?
print "*** $_";
last;
} elsif (/^lsof: /) {
# warning
warn "* $_";
} elsif (/^p(\d+)$/) {
&flush;
$pid = $1;
$proto = 0;
} elsif (/^c(.*)$/) {
$command = $1;
} elsif (/^L(.*)$/) {
$user = $1;
} elsif (/^P(.*)$/) {
&flush;
$proto = $1;
} elsif (/^n(.*)$/) {
$name = $1;
# replace local hostname by 'localhost'
$name =~ s/\Q$fq_hostname\E/localhost/g;
$name =~ s/[0-9hms]+ ago//g;
} elsif (/^m$/) {
&flush;
&clean;
} else {
warn "* bad output ignored: $_";
}
}
kill('INT', $lsof_pid);
kill('KILL', $lsof_pid);
close(PIPE);
}
sub hangup {
$hanguped = 1;
$SIG{'HUP'} = \&hangup;
}
sub flush {
return unless $pid && $proto;
return if &skip;
$tag = sprintf("%-9s %5d %8s %1s %s", $command, $pid, $user,
substr($proto, 0, 1), $name);
unless (defined($seen{$tag})) {
print "+$tag\n";
$printed++;
}
$seen{$tag} = 1;
}
sub clean {
my(@to_delete, $tag);
if ($hanguped) {
$hanguped = 0;
@to_delete = keys(%seen);
print "# ", ×tamp, " hangup received, rescanning all connections\n"
if $verbose;
} else {
@to_delete = ();
foreach $tag (keys(%seen)) {
if ($seen{$tag} == 0) {
# not seen this time: delete it
push(@to_delete, $tag);
print "-$tag\n";
$printed++;
} else {
# seen this time: reset the flag
$seen{$tag} = 0;
}
}
}
grep(delete($seen{$_}), @to_delete);
if ($printed > 10) {
print "# ", ×tamp, "\n" if $verbose;
$printed = 0;
}
}
sub skip {
#
# put stuff here to ignore some connections, for instance:
#
# what we get when the socket gets created...
return(1) if $name eq '*:0';
return(1) if $name =~ /^localhost:(\d+)$/ && $1 > 1000;
#
# UDP & TCP stuff
#
#
# ignore common daemons
#
if ($name =~ /^\*:/ && $user eq 'root' && $pid < 300) {
return(1) if $command =~ /^inetd(\.afs)?$/;
return(1) if $command =~ /^rpc\.(stat|lock)d$/;
return(1) if $command eq 'syslogd' && $name eq '*:syslog';
}
#
# forking beasts: portmap, ypbind, inetd
#
if ($command eq 'portmap' && $user eq 'daemon') {
return(1) if $name =~ /^\*:/;
} elsif ($command eq 'ypbind') {
return(1) if $name =~ /^\*:\d+$/;
}
#
# TCP-only stuff
#
return(0) unless $proto eq 'TCP';
#
# outgoing commands: ftp, telnet, r*
#
if ($command eq 'ftp') {
return(1) if $name =~ /:ftp(-data)?$/;
} elsif ($command eq 'telnet') {
return(1) if $name =~ /:telnet$/;
} elsif ($command eq 'remsh') {
if ($name =~ /:(\d?\d\d\d)->.+:(\d?\d\d\d)$/) {
return(1) if $1 < 1024 && $1 > 990 && $2 < 1024 && $2 > 990;
} elsif ($name =~ /:(\d?\d\d\d)->.+:(shell|ta-rauth)$/) {
return(1) if $1 < 1024 && $1 > 990;
} elsif ($name =~ /^\*:(\d?\d\d\d)$/) {
return(1) if $1 < 1024 && $1 > 990;
}
}
return(0);
}
sub timestamp {
my($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst);
($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time);
sprintf("%d/%02d/%02d-%02d:%02d:%02d", $year + 1900, $mon+1, $mday,
$hour, $min, $sec);
}
## isexec($path) -- is $path executable
#
# $path = absolute or relative path to file to test for executabiity.
# Paths that begin with neither '/' nor '.' that arent't found as
# simple references are also tested with the path prefixes of the
# PATH environment variable.
sub
isexec {
my ($path) = @_;
my ($i, @P, $PATH);
$path =~ s/^\s+|\s+$//g;
if ($path eq "") { return(""); }
if (($path =~ m#^[\/\.]#)) {
if (-x $path) { return($path); }
return("");
}
$PATH = $ENV{PATH};
@P = split(":", $PATH);
for ($i = 0; $i <= $#P; $i++) {
if (-x "$P[$i]/$path") { return("$P[$i]/$path"); }
}
return("");
}
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