1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
package Echolot::Pinger;
# (c) 2002 Peter Palfrader <peter@palfrader.org>
# $Id: Pinger.pm,v 1.17 2002/07/17 17:53:44 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 Carp qw{cluck};
use English;
use Echolot::Pinger::Mix;
use Echolot::Pinger::CPunk;
sub do_mix_ping($$$$$) {
my ($address, $keyid, $time, $to, $body) = @_;
my %key = Echolot::Globals::get()->{'storage'}->get_key($address, 'mix', $keyid);
Echolot::Pinger::Mix::ping(
$body,
$to,
[ $key{'nick'} ],
{ $keyid => \%key } ) or
return 0;
return 1;
};
sub do_cpunk_ping($$$$$$) {
my ($address, $type, $keyid, $time, $to, $body) = @_;
my $keyhash;
if ($type ne 'cpunk-clear') {
my %key = Echolot::Globals::get()->{'storage'}->get_key($address, $type, $keyid);
$keyhash = { $keyid => \%key };
};
Echolot::Pinger::CPunk::ping(
$body,
$to,
[ { address => $address,
keyid => $keyid,
encrypt => ($type ne 'cpunk-clear') } ],
$keyhash,
$type eq 'cpunk-rsa' ) or
return 0;
return 1;
};
sub do_ping($$$) {
my ($type, $address, $key) = @_;
my $now = time();
my $token = $address.':'.$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";
my $to = Echolot::Tools::make_address('ping');
if ($type eq 'mix') {
do_mix_ping($address, $key, $now, $to, $body);
} elsif ($type eq 'cpunk-rsa' || $type eq 'cpunk-dsa' || $type eq 'cpunk-clear') {
do_cpunk_ping($address, $type, $key, $now, $to, $body);
} else {
cluck ("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 $call_intervall = Echolot::Config::get()->{'pinger_interval'};
my $send_every_n_calls = Echolot::Config::get()->{'ping_every_nth_time'};
my $timemod = (time() / $call_intervall);
my $this_call_id = $timemod % $send_every_n_calls;
my @remailers = Echolot::Globals::get()->{'storage'}->get_remailers();
for my $remailer (@remailers) {
next unless $remailer->{'pingit'};
my $address = $remailer->{'address'};
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, $type)) {
next unless ($this_call_id eq (Echolot::Tools::makeShortNumHash($address.$type.$key) % $send_every_n_calls));
print "ping calling $type, $address, $key\n" if Echolot::Config::get()->{'verbose'};
do_ping($type, $address, $key);
}
};
};
return 1;
};
sub receive($$$) {
my ($body, $token, $timestamp) = @_;
my $now = time();
my ($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 $cleanstring = (defined $addr ? $addr : 'undef') . ':' .
(defined $type ? $type : 'undef') . ':' .
(defined $key ? $key : 'undef') . ':' .
(defined $sent ? $sent : 'undef') . ':' .
(defined $mac ? $mac : 'undef') . ':';
(defined $addr && defined $type && defined $key && defined $sent && defined $mac) or
warn ("Received ping at $timestamp has undefined values: $cleanstring\n"), #FIXME: logging
return 0;
Echolot::Tools::verify_mac($addr.':'.$type.':'.$key.':'.$sent, $mac) or
warn ("Received ping at $timestamp has wrong mac; $cleanstring\n"), #FIXME: logging
return 0;
Echolot::Globals::get()->{'storage'}->register_pingdone($addr, $type, $key, $sent, $now - $sent) or
return 0;
return 1;
};
1;
# vim: set ts=4 shiftwidth=4:
|
