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package Echolot::Pinger;
# (c) 2002 Peter Palfrader <peter@palfrader.org>
# $Id: Pinger.pm,v 1.23 2003/02/14 04:56:16 weasel Exp $
#
=pod
=head1 Name
Echolot::Pinger - actual sending and receiving of Pings.
=head1 DESCRIPTION
This package provides functions for sending out and receiving pings.
=cut
use strict;
use English;
use Echolot::Log;
use Echolot::Pinger::Mix;
use Echolot::Pinger::CPunk;
sub do_mix_ping($$$$$$) {
my ($address, $type, $keyid, $to, $body) = @_;
($type eq 'mix') or
Echolot::Log::warn("types should really be mix ($type)."),
return 0;
my %key = Echolot::Globals::get()->{'storage'}->get_key($address, $type, $keyid);
Echolot::Pinger::Mix::ping(
$body,
$to,
[ $key{'nick'} ],
{ $keyid => \%key } ) or
return 0;
return 1;
};
sub do_cpunk_ping($$$$$$) {
my ($address, $type, $keyid, $to, $body) = @_;
my $keyhash = {};
if ($type ne 'cpunk-clear') {
my %key = Echolot::Globals::get()->{'storage'}->get_key($address, $type, $keyid);
$keyhash->{$keyid} => \%key;
};
Echolot::Pinger::CPunk::ping(
$body,
$to,
[ { address => $address,
keyid => $keyid,
encrypt => ($type ne 'cpunk-clear'),
pgp2compat => ($type eq 'cpunk-rsa') } ],
$keyhash ) or
return 0;
return 1;
};
sub do_ping($$$) {
my ($type, $address, $key) = @_;
my $now = time();
my $token = join(':', $address, $type, $key, $now);
my $mac = Echolot::Tools::make_mac($token);
my $body = "remailer: $address\n".
"type: $type\n".
"key: $key\n".
"sent: $now\n".
"mac: $mac\n";
$body = Echolot::Tools::crypt_symmetrically($body, 'encrypt');
my $to = Echolot::Tools::make_address('ping');
if ($type eq 'mix') {
do_mix_ping($address, $type, $key, $to, $body);
} elsif ($type eq 'cpunk-rsa' || $type eq 'cpunk-dsa' || $type eq 'cpunk-clear') {
do_cpunk_ping($address, $type, $key, $to, $body);
} else {
Echolot::Log::warn("Don't know how to handle ping type $type.");
return 0;
};
Echolot::Globals::get()->{'storage'}->register_pingout($address, $type, $key, $now);
return 1;
};
sub send_pings($;$) {
my ($scheduled_for, $which) = @_;
$which = '' unless defined $which;
my $call_intervall = Echolot::Config::get()->{'pinger_interval'};
my $send_every_n_calls = Echolot::Config::get()->{'ping_every_nth_time'};
my $timemod = int ($scheduled_for / $call_intervall);
my $this_call_id = $timemod % $send_every_n_calls;
my $session_id = int ($scheduled_for / ($call_intervall * $send_every_n_calls));
my @remailers = Echolot::Globals::get()->{'storage'}->get_remailers();
for my $remailer (@remailers) {
next unless $remailer->{'pingit'};
my $address = $remailer->{'address'};
next unless (
$which eq 'all' ||
$which eq $address ||
$which eq '');
for my $type (Echolot::Globals::get()->{'storage'}->get_types($address)) {
next unless Echolot::Config::get()->{'do_pings'}->{$type};
for my $key (Echolot::Globals::get()->{'storage'}->get_keys($address, $type)) {
next unless (
$which eq $address ||
$which eq 'all' ||
(($which eq '') && ($this_call_id eq (Echolot::Tools::makeShortNumHash($address.$type.$key.$session_id) % $send_every_n_calls))));
Echolot::Log::debug("ping calling $type, $address, $key.");
do_ping($type, $address, $key);
}
};
};
return 1;
};
sub receive($$$) {
my ($msg, $token, $timestamp) = @_;
my $now = time();
my $body;
if ($msg =~ /^-----BEGIN PGP MESSAGE-----/m) {
# work around borken middleman remailers that have a problem with some
# sort of end of line characters and randhopping them through reliable
# remailers..
# they add an empty line between each usefull line
$msg =~ s/(\r?\n)\r?\n/$1/g if ($msg =~ /^-----BEGIN PGP MESSAGE-----\r?\n\r?\n/m);
$body = Echolot::Tools::crypt_symmetrically($msg, 'decrypt');
};
$body = $msg unless defined $body;
my ($addr) = $body =~ /^remailer: (.*)$/m;
my ($type) = $body =~ /^type: (.*)$/m;
my ($key) = $body =~ /^key: (.*)$/m;
my ($sent) = $body =~ /^sent: (.*)$/m;
my ($mac) = $body =~ /^mac: (.*)$/m;
my @values = ($addr, $type, $key, $sent, $mac);
my $cleanstring = join ":", map { defined() ? $_ : "undef" } @values;
(grep { ! defined() } @values) and
Echolot::Log::warn("Received ping at $timestamp has undefined values: $cleanstring."),
return 0;
pop @values;
Echolot::Tools::verify_mac(join(':', @values), $mac) or
Echolot::Log::warn("Received ping at $timestamp has wrong mac; $cleanstring."),
return 0;
Echolot::Globals::get()->{'storage'}->register_pingdone($addr, $type, $key, $sent, $now - $sent) or
return 0;
return 1;
};
1;
# vim: set ts=4 shiftwidth=4:
|
