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+#!/usr/local/bin/perl
+#
+# $Id: idrlogin.perl,v 1.5 2001/11/18 12:20:46 abe Exp $
+#
+# idrlogin.perl -- sample Perl script to identify the network source of a
+# network (remote) login via rlogind, sshd, or telnetd
+
+
+# IMPORTANT DEFINITIONS
+# =====================
+#
+# 1. Set the interpreter line of this script to the local path of the
+# Perl executable.
+
+
+#
+# Copyright 1997 Purdue Research Foundation, West Lafayette, Indiana
+# 47907. All rights reserved.
+#
+# Written by Victor A. Abell
+#
+# This software is not subject to any license of the American Telephone
+# and Telegraph Company or the Regents of the University of California.
+#
+# Permission is granted to anyone to use this software for any purpose on
+# any computer system, and to alter it and redistribute it freely, subject
+# to the following restrictions:
+#
+# 1. Neither the authors nor Purdue University are responsible for any
+# consequences of the use of this software.
+#
+# 2. The origin of this software must not be misrepresented, either by
+# explicit claim or by omission. Credit to the authors and Purdue
+# University must appear in documentation and sources.
+#
+# 3. Altered versions must be plainly marked as such, and must not be
+# misrepresented as being the original software.
+#
+# 4. This notice may not be removed or altered.
+
+# Initialize variables.
+
+$dev = $name = $proto = ""; # fd variables
+$fdst = 0; # fd state
+$pidst = 0; # process state
+$cmd = $login = $pid = $ppid = ""; # process var.
+
+# Set path to lsof.
+
+if (($LSOF = &isexec("../lsof")) eq "") { # Try .. first
+ if (($LSOF = &isexec("lsof")) eq "") { # Then try . and $PATH
+ print "can't execute $LSOF\n"; exit 1
+ }
+}
+
+# Open a pipe from lsof.
+
+open(P, "$LSOF -R -FcDfLpPRn|") || die "Can't pipe from $LSOF\n";
+
+# Process the ``lsof -FcDfLpPRn'' output a line at a time
+
+while (<P>) {
+ chop;
+ if (/^p(.*)/) {
+
+# A process set begins with a PID field whose ID character is `p'.
+
+ $tpid = $1;
+ if ($pidst && $fdst) { &save_proc }
+ $pidst = 1;
+ $pid = $tpid;
+ $cmd = $login = $ppid = "";
+ $fdst = 0;
+ $dev = $name = $proto = "";
+ next;
+ }
+
+# Save process-related values.
+
+ if (/^c(.*)/) { $cmd = $1; next; }
+ if (/^L(.*)/) { $login = $1; next; }
+ if (/^R(.*)/) { $ppid = $1; next; }
+
+# A file set begins with a file descriptor field.
+
+ if (/^f/) {
+ if ($pidst && $fdst) { &save_proc }
+ $fdst = 0;
+ $dev = $name = $proto = "";
+ next;
+ }
+
+# Accumulate file information.
+
+ if (/^D(.*)/) { $dev = $1; next; }
+ if (/^P(.*)/) { $proto = $1; next; }
+ if (/^n(.*)/) { $name = $1; $fdst = 1; next; }
+}
+
+# Flush any stored file or process output.
+
+if ($pidst && $fdst) { &save_proc }
+
+# List the shell processes that have rlogind/sshd//telnetd parents.
+
+$hdr = 0;
+foreach $pid (sort keys(%shcmd)) {
+ $p = $pid;
+ if (!defined($raddr{$pid})) {
+ for ($ff = 0; !$ff && defined($Ppid{$p}); ) {
+ $p = $Ppid{$p};
+ if ($p < 2 || defined($raddr{$p})) { $ff = 1; }
+ }
+ } else { $ff = 2; }
+ if ($ff && defined($raddr{$p})) {
+ if (!$hdr) {
+ printf "%-8.8s %-8.8s %6s %-10.10s %6s %-10.10s %s\n",
+ "Login", "Shell", "PID", "Via", "PID", "TTY", "From";
+ $hdr = 1;
+ }
+ printf "%-8.8s %-8.8s %6d %-10.10s %6s %-10.10s %s\n",
+ $shlogin{$pid}, $shcmd{$pid}, $pid,
+ ($ff == 2) ? "(direct)" : $rcmd{$p},
+ ($ff == 2) ? "" : $p,
+ ($shtty{$pid} eq "") ? "(unknown)" : $shtty{$pid},
+ $raddr{$p};
+ }
+}
+exit(0);
+
+
+# save_proc -- save process information
+# Values are stored inelegantly in global variables.
+
+sub save_proc {
+ if ($cmd eq ""
+ || $login eq ""
+ || $ppid eq ""
+ || $pid eq ""
+ || $name eq ""
+ ) { return; }
+ if (!defined($Ppid{$pid})) { $Ppid{$pid} = $ppid; }
+ if ($proto eq "TCP"
+ && (($cmd =~ /rlogind/) || ($cmd =~ /sshd/) || ($cmd =~ /telnetd/))) {
+ if (defined($raddr{$pid})) { return; }
+ if (($name =~ /[^:]*:[^-]*->([^:]*):.*/)) {
+ $raddr{$pid} = $1;
+ $rcmd{$pid} = $cmd;
+ return;
+ }
+ }
+ if (($cmd =~ /.*sh$/)) {
+ if (defined($shcmd{$pid})) { return; }
+ if ($proto eq "TCP") {
+ if (defined($raddr{$pid})) { return; }
+ if (($name =~ /[^:]*:[^-]*->([^:]*):.*/)) {
+ $raddr{$pid} = $1;
+ $shcmd{$pid} = $cmd;
+ $shlogin{$pid} = $login;
+ }
+ }
+ if (($name =~ m#/dev.*ty.*#)) {
+ ($tty) = ($name =~ m#/dev.*/(.*)#);
+ } elsif (($name =~ m#/dev/(pts/\d+)#)) {
+ $tty = $1;
+ } elsif (($name =~ m#/dev.*pts.*#)) {
+ $d = oct($dev);
+ $tty = sprintf("pts/%d", $d & 0xffff);
+ } else { return; }
+ } else { return; }
+ $shcmd{$pid} = $cmd;
+ $shtty{$pid} = $tty;
+ $shlogin{$pid} = $login;
+}
+
+
+## isexec($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("");
+}