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#!/usr/bin/perl
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#
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# $Id: pptp_fe.pl,v 1.1 2001/11/29 05:19:10 quozl Exp $
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#
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# pptp_fe.pl, privileged portion of xpptp_fe.pl
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# Copyright (C) 2001 Smoot Carl-Mitchell (smoot@tic.com)
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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use strict;
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use Getopt::Std;
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use Time::localtime;
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use IO::Handle;
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my $Usage = "usage: pptp_fe [-c config_file] [-d] [-h] [-k] [-n network]
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[-p] [-r routes] [-t timeout] [host]
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where:
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-c - configuration file (default is ~/.pptp_fe.conf)
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-d - pppd debug flag
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-h - this help message
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-k - kill pppd daemon with route to network
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-n - network number of remote private network in x.x.x.x/n notation
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-r - routes to add to routing table separated by commas
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-p - suppress prompting
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-t - connection timeout retry interval in seconds (default 60 seconds)
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host - remote PPTP server name
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";
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my %Opt;
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getopts("c:dhkn:pr:t:", \%Opt);
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my $Config_File = $Opt{'c'};
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$Config_File = "$ENV{'HOME'}/.pptp_fe.conf" unless $Opt{'c'};
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my $Config;
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my $Debug = $Opt{'d'};
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$Debug = 0 unless $Debug;
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my $Debug_Flag = "debug" if $Debug;
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my $Help = $Opt{'h'};
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my $Kill = $Opt{'k'};
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my $Net = $Opt{'n'};
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my $No_Prompt = $Opt{'p'};
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my $Route = $Opt{'r'};
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my $Timeout = $Opt{'t'}; $Timeout = 60 unless $Timeout;
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print($Usage), exit(1) if $Help;
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my $Server = $ARGV[0];
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my $State = "disconnected";
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system("modprobe ppp-compress-18");
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$Config = cmd_read_config_file($Config_File);
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for my $cmd (@$Config) {
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cmd_set($cmd, 1);
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}
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print "($State) > " unless $No_Prompt;
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STDOUT->flush;
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for (;;) {
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my $rin = '';
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my $rout = '';
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vec($rin, fileno(STDIN), 1) = 1;
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command() if select($rout=$rin, undef, undef, 5);
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my $interface = "";
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if ($State eq "connected" && ! ($interface = net_interface_up($Net))) {
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print "\n";
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print "interface $interface for $Net not up - restarting\n";
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cmd_connect();
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print "($State) > " unless $No_Prompt;;
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}
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}
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sub command {
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my $input;
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sysread(STDIN, $input, 1024);
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for my $line1 (split("\n", $input)) {
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my $line = $line1;
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$line =~ s/\s*$//;
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$line =~ s/^\s*//;
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my ($command, $arguments) = split(" ", $line, 2);
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if ($command eq "c") {
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cmd_connect();
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}
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elsif ($command eq "d") {
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cmd_disconnect();
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}
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elsif ($command eq "h") {
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cmd_help();
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}
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elsif ($command eq "l") {
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cmd_list();
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}
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elsif ($command eq "q") {
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cmd_disconnect();
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exit 0;
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}
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elsif ($command eq "r") {
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$Config = cmd_read_config_file($arguments);
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}
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elsif ($command eq "s") {
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cmd_set($arguments, 0);
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}
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elsif ($command eq "w") {
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cmd_write_config_file($arguments);
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}
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elsif ($command ne "") {
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print "unknown command\n";
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}
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}
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print "($State) > " unless $No_Prompt;
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STDOUT->flush;
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}
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sub cmd_connect {
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cmd_disconnect() if $State eq "connected";
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my $start_time = time();
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my $date_string = ctime($start_time);
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print "$date_string Running pptp $Server $Debug_Flag";
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system("pptp $Server $Debug_Flag");
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my $interface = "";
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do {
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sleep 1;
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$interface = net_interface_up($Net);
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print ".";
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} until ($interface || time() > $start_time + $Timeout);
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if (time() > $start_time + $Timeout) {
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print "timed out after $Timeout sec\n";
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$State = "disconnected";
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return 0;
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}
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print "\n";
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my $ifcfg = `ifconfig $interface`;
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$ifcfg =~ /P-t-P:(.*) Mask/;
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my $ip = $1;
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print "setting route to network $Net to interface $interface\n";
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system("route add -net $Net dev $interface metric 2");
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# Routes are separated by commas
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my @route = split(/,/, $Route);
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for my $route (@route) {
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my $net_flag = "";
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$net_flag = "-net" if $route =~ /\//;
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print "setting route to $route to interface $interface\n";
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system("route add $net_flag $route dev $interface");
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}
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$State = "connected";
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print "connected\n";
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return 1;
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}
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sub cmd_disconnect {
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return 1 if $State eq "disconnected";
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my $interface = net_interface_up($Net);
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my $pid_file = "/var/run/$interface.pid";
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# delete the named pipes - XXX this is a bit crude
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system("rm -f /var/run/pptp/*");
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$State = "disconnected", return 1 unless $interface && -f $pid_file;
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my $pid = `cat $pid_file`;
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chomp $pid;
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print "killing pppd($pid)\n";
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kill("HUP", $pid);
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print "waiting for pppd to die";
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do {
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sleep 1;
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print ".";
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}
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until (kill(0, $pid));
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print "\n";
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$State = "disconnected";
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print "disconnected\n";
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return 1;
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}
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sub cmd_list {
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print "Server = $Server\n";
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print "Network = $Net\n";
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print "Routes = $Route\n";
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print "Debug = $Debug_Flag\n";
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print "No_Prompt = $No_Prompt\n";
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print "Timeout = $Timeout\n";
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print "\n";
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}
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sub cmd_help {
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print "Commands are:\n";
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print "c - initiate PPTP connection\n";
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print "d - disconnect PPTP\n";
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print "h - this help message\n";
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print "l - list current configuration\n";
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print "q - quite the program\n";
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print "r - read configuration file\n";
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print "s - set configuration variable (l for a list)\n";
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print "w - write the configuration file\n";
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}
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sub cmd_set {
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my $input = shift;
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my $no_replace = shift;
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my ($variable, $value) = split(/\s*=\s*/, $input);
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$variable = "\L$variable";
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if (! $variable) {
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print "syntax: s variable = value\n";
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return 0;
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}
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if ($variable eq "server") {
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$Server = $value unless $no_replace && $Server;
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}
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elsif ($variable eq "network") {
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$Net = $value unless $no_replace && $Net;
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}
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elsif ($variable eq "routes") {
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$Route = $value unless $no_replace && $Route;
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}
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elsif ($variable eq "debug") {
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$Debug_Flag = $value unless $no_replace && $Debug_Flag;
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}
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elsif ($variable eq "no_prompt") {
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$No_Prompt = $value unless $no_replace && $No_Prompt;
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}
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elsif ($variable eq "timeout") {
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$Timeout = $value unless $no_replace && $Timeout;
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}
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elsif ($variable eq "config_file") {
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$Config_File = $value unless $no_replace && $Config_File;
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}
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else {
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print "unknown variable\n";
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}
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}
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sub cmd_read_config_file {
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my $file = shift;
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my $config = [];
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$file = $Config_File unless $file;
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local *IN;
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if (!open(IN, $file)) {
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print "cannot open $file\n";
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return $config;
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}
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my @config_file = <IN>;
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close IN;
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push @config_file, "\n";
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chomp @config_file;
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for my $line (@config_file) {
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next if /\s*#/;
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if ($line =~ /\S/) {
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$line =~ s/^\s*//;
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$line =~ s/\s*$//;
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push @$config, $line;
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next;
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}
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}
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return $config;
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}
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sub cmd_write_config_file {
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my $file = shift;
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$file = $Config_File unless $file;
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local *OUT;
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if (!open(OUT, ">$file")) {
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print "cannot open $file\n";
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return 0;
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}
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my $oldfh = select OUT;
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cmd_list();
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close OUT;
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select $oldfh;
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return 1;
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}
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sub net_interface_up {
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my $cidr = shift;
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# cidr is net/bits
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my($net, $nbits) = split(/\//, $cidr);
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# compute the network number
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my $netnum = netnum($net, $nbits);
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local(*INTERFACE);
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open(INTERFACE, "ifconfig|") || die "cannot run ifconfig - $!\n";
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my $interface = "";
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my @interface = <INTERFACE>;
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close INTERFACE;
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for (@interface) {
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chomp;
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# new interface
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if (/^[a-zA-Z]/) {
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if ($interface =~ /(.*) Link.*P-t-P:(.*) Mask/) {
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my $interface_name = $1;
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my $ip = $2;
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return $interface_name
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if netnum($ip, $nbits) == $netnum;
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}
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$interface = "";
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}
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$interface .= $_;
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}
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return "";
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}
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sub netnum {
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my $net = shift;
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my $bits = shift;
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my @octets = split(/\./, $net);
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my $netnum = 0;
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for my $octet (@octets) {
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$netnum <<= 8;
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$netnum |= $octet;
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}
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my $mask = 0;
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for (1..$bits) {
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$mask <<= 1;
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$mask |= 1;
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}
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$mask = $mask << (32-$bits);
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$netnum &= $mask;
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return $netnum;
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}
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