AMPR-Rip44

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META.json  view on Meta::CPAN

{
   "abstract" : "A naive custom RIPv2 daemon",
   "author" : [
      "Heikki Hannikainen, OH7LZB <hessu@hes.iki.fi>"
   ],
   "dynamic_config" : 1,
   "generated_by" : "ExtUtils::MakeMaker version 6.62, CPAN::Meta::Converter version 2.112621",
   "license" : [
      "unknown"
   ],
   "meta-spec" : {
      "url" : "http://search.cpan.org/perldoc?CPAN::Meta::Spec",
      "version" : "2"

META.yml  view on Meta::CPAN

---
abstract: 'A naive custom RIPv2 daemon'
author:
  - 'Heikki Hannikainen, OH7LZB <hessu@hes.iki.fi>'
build_requires:
  ExtUtils::MakeMaker: 0
configure_requires:
  ExtUtils::MakeMaker: 0
dynamic_config: 1
generated_by: 'ExtUtils::MakeMaker version 6.62, CPAN::Meta::Converter version 2.112621'
license: unknown
meta-spec:
  url: http://module-build.sourceforge.net/META-spec-v1.4.html

bin/rip44d  view on Meta::CPAN

# http://evvk.com/evvktvh.html#english
#
#
# Version history:
#
# see Changes

# Things to do in the future:
#
# - proper logging to syslog
# - support for better authentication, if one would be supported
# - support for multiple RIP masters, to fix the single point of failure
#

use strict;
use warnings;

use IO::Socket::Multicast;
use Getopt::Std;

use constant {

bin/rip44d  view on Meta::CPAN

		. "  $me [-v] [-d] [-i <tunnelif>] [-a <localaddrs>] [-p <password>]\n"
		. "Options:\n"
		. "  -v   increase verbosity slightly to print error messages on stderr\n"
		. "  -d   increase verbosity greatly (debug mode)\n"
		. "  -i <tunnelinterface>\n"
		. "       use the specified tunnel interface, defaults to tunl0\n"
		. "  -a <comma-separated-ip-list>\n"
		. "       ignore routes pointing to these (local) gateways\n"
		. "       (list contains system's local IP addresses by default)\n"
		. "  -p <password>\n"
		. "       use RIPv2 password 'authentication', defaults to none\n"
		;
}

sub VERSION_MESSAGE()
{
	my($fh) = @_;
	
	print $fh "$me version $VERSION\n";
}

bin/rip44d  view on Meta::CPAN

	# now go and update the routing table
	route_delete($rkey);
	my($out, $cmd);
	$cmd = "LANG=C $routebin route add $rkey via $nexthop dev $tunnel_if window $tcp_window onlink";
	$out = `$cmd 2>&1\n`;
	if ($?) {
		warn "route add failed: '$cmd': $out\n";
	}
}

# process a RIPv2 password authentication entry

sub process_rip_auth_entry($)
{
	my($entry) = @_;
	
	my $e_af = unpack('n', substr($entry, 0, 2));
	if ($e_af != 0xFFFF) {
		warn "RIPv2 first message does not contain auth password: ignoring\n" if ($verbose);
		return 0;
	}
	
	my $e_type = unpack('n', substr($entry, 2, 2));
	if ($e_type != RIP_AUTH_PASSWD) {
		warn "ignoring unsupported rip auth type $e_type\n" if ($verbose);
		return 0;
	}
	
	my $e_passwd = substr($entry, 4, 16);
	$e_passwd =~ s/\0*$//; # it's null-padded in the end
	
	if (!defined $rip_passwd) {
		warn "RIPv2 packet contains password $e_passwd but we require none\n" if ($verbose);
		return 0;
	}

bin/rip44d  view on Meta::CPAN

# process a RIPv2 route entry

sub process_rip_route_entry($)
{
	my($entry) = @_;
	
	my $e_af = unpack('n', substr($entry, 0, 2));
	my $e_rtag = unpack('n', substr($entry, 2, 2));

	if ($e_af == 0xFFFF) {
		process_rip_auth_entry($entry);
		return -1;
	}
	
	if ($e_af != AF_INET) {
		warn "$me: RIPv2 entry has unsupported AF $e_af\n";
		return 0;
	}
	
	my $e_net = substr($entry, 4, 4);
	my $e_net_i = unpack('N', $e_net);

bin/rip44d  view on Meta::CPAN

		warn "$me: ignored RIP version $rip_version packet from $addr_s (only accept v2)\n";
		return -1;
	}
	if ($zero1 != 0 || $zero2 != 0) {
		warn "$me: ignored RIP packet from $addr_s: zero bytes are not zero in header\n";
		return -1;
	}
	
	my $init_msg = 0;
	
	# if password auth is required, require it!
	if (defined $rip_passwd) {
		return -1 if (!process_rip_auth_entry(substr($entries, 0, RIP_ENTRY_LEN)));
		$init_msg += RIP_ENTRY_LEN;
	}
	
	# Ok, process the actual route entries
	my $routes = 0;
	for (my $i = $init_msg; $i < length($entries); $i += RIP_ENTRY_LEN) {
		my $entry = substr($entries, $i, RIP_ENTRY_LEN);
		my $n = process_rip_route_entry($entry);
		return -1 if ($n < 0);
		$routes += $n;