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|
# -*- perl -*-
#
# INetSim::Syslog - A fake Syslog server
#
# RFC 3164 - The BSD syslog Protocol
#
# (c)2008-2019 Matthias Eckert, Thomas Hungenberg
#
#############################################################
package INetSim::Syslog;
use strict;
use warnings;
use base qw(INetSim::GenericServer);
my %Facility = ( 0 => 'kernel',
1 => 'user',
2 => 'mail',
3 => 'system',
4 => 'security/authorization',
5 => 'syslog',
6 => 'printer',
7 => 'news',
8 => 'uucp',
9 => 'clock',
10 => 'security/authorization',
11 => 'ftp',
12 => 'ntp',
13 => 'log audit',
14 => 'log alert',
15 => 'clock',
16 => 'local0',
17 => 'local1',
18 => 'local2',
19 => 'local3',
20 => 'local4',
21 => 'local5',
22 => 'local6',
23 => 'local7'
);
my %Severity = ( 0 => 'emergency',
1 => 'alert',
2 => 'critical',
3 => 'error',
4 => 'warning',
5 => 'notice',
6 => 'informational',
7 => 'debug'
);
sub configure_hook {
my $self = shift;
my $server = $self->{server};
$server->{host} = INetSim::Config::getConfigParameter("Default_BindAddress"); # bind to address
$server->{port} = INetSim::Config::getConfigParameter("Syslog_BindPort"); # bind to port
$server->{proto} = 'udp'; # UDP protocol
$server->{user} = INetSim::Config::getConfigParameter("Default_RunAsUser"); # user to run as
$server->{group} = INetSim::Config::getConfigParameter("Default_RunAsGroup"); # group to run as
$server->{setsid} = 0; # do not daemonize
$server->{no_client_stdout} = 1; # do not attach client to STDOUT
$server->{log_level} = 0; # do not log anything
$server->{udp_recv_len} = 960; # default is 4096
}
sub pre_loop_hook {
$0 = 'inetsim_' . INetSim::Config::getConfigParameter("Syslog_ServiceName");
INetSim::Log::MainLog("started (PID $$)", INetSim::Config::getConfigParameter("Syslog_ServiceName"));
}
sub pre_server_close_hook {
INetSim::Log::MainLog("stopped (PID $$)", INetSim::Config::getConfigParameter("Syslog_ServiceName"));
}
sub fatal_hook {
INetSim::Log::MainLog("failed!", INetSim::Config::getConfigParameter("Syslog_ServiceName"));
exit 0;
}
sub process_request {
my $self = shift;
my $server = $self->{server};
my $client = $server->{client};
my $rhost = $server->{peeraddr};
my $rport = $server->{peerport};
my $serviceName = INetSim::Config::getConfigParameter("Syslog_ServiceName");
my $maxchilds = INetSim::Config::getConfigParameter("Default_MaxChilds");
my $trim_maxlength = INetSim::Config::getConfigParameter("Syslog_TrimMaxLength");
my $accept_invalid = INetSim::Config::getConfigParameter("Syslog_AcceptInvalid");
my $stat_success = 0;
my $msg;
my $priority;
my $timestamp;
my $content;
my $facility;
my $severity;
my $length;
my $valid = 0;
my $relay = 0;
my $hostname;
my $header;
my $message;
if ($server->{numchilds} >= $maxchilds) {
print $client "Maximum number of connections ($maxchilds) exceeded.\n";
INetSim::Log::SubLog("[$rhost:$rport] Connection refused - maximum number of connections ($maxchilds) exceeded.", $serviceName, $$);
}
else {
INetSim::Log::SubLog("[$rhost:$rport] connect", $serviceName, $$);
$msg = $server->{udp_data};
chomp($msg);
$msg =~ s/\A[\r\n\s\t]+//;
$msg =~ s/[\r\n\s\t]+\z//;
if (! $msg) {
INetSim::Log::SubLog("[$rhost:$rport] recv: invalid syslog packet (empty)", $serviceName, $$);
INetSim::Log::SubLog("[$rhost:$rport] disconnect", $serviceName, $$);
return;
}
if ($trim_maxlength && length($msg) > 1024) {
$msg = substr($msg, 0, 1024);
INetSim::Log::SubLog("[$rhost:$rport] info: Shortened syslog packet to maximum length of 1024 bytes", $serviceName, $$);
}
# check for valid priority and timestamp field
if ($msg =~ /\A\<([\d]{1,3})\>((Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)[\s]+[\d]{1,2}[\s]+\d\d:\d\d:\d\d)[\s]+(.*)\z/) {
if (defined ($1) && length($1) && defined ($2) && length($2) && defined ($4) && length($4)) {
$priority = $1;
$timestamp = $2;
$content = $4;
$length = int(length($priority) + 2 + length($timestamp) + 1 + length($content));
($facility, $severity) = dec_PRIORITY($priority);
if (defined ($facility) && defined ($severity)) {
if ($trim_maxlength && $length > 1024) {
$content = substr($content, 0, int($length - ($length - 1024)));
INetSim::Log::SubLog("[$rhost:$rport] info: Shortened syslog packet to maximum length of 1024 bytes", $serviceName, $$);
}
$valid = 1;
}
}
}
elsif ($msg =~ /\A\<([\d]{1,3})\>(.*)\z/) {
if (defined ($1) && length($1) && defined ($2) && length($2)) {
$priority = $1;
$timestamp = _timestamp();
$content = $2;
$length = int(length($priority) + 2 + length($content));
($facility, $severity) = dec_PRIORITY($priority);
if (defined ($facility) && defined ($severity)) {
if ($trim_maxlength && $length > 1024) {
$content = substr($content, 0, int($length - ($length - 1024)));
INetSim::Log::SubLog("[$rhost:$rport] info: Shortened syslog packet to maximum length of 1024 bytes", $serviceName, $$);
}
$valid = 1;
}
}
}
# build priority, timestamp and hostname for the packet
if (! $valid && $accept_invalid) {
$priority = 13;
$timestamp = _timestamp();
$content = $msg;
$length = int(length($priority) + 2 + length($timestamp) + 1 + length($content));
($facility, $severity) = dec_PRIORITY($priority);
if (defined ($facility) && defined ($severity)) {
if ($trim_maxlength && $length > 1024) {
$content = substr($content, 0, int($length - ($length - 1024)));
INetSim::Log::SubLog("[$rhost:$rport] info: Shortened syslog packet to maximum length of 1024 bytes", $serviceName, $$);
}
$valid = 1;
$relay = 1;
}
}
# now log the "decoded" message
if ($valid) {
if ($accept_invalid && $relay) {
INetSim::Log::SubLog("[$rhost:$rport] recv: [Relayed] $facility.$severity $timestamp $content", $serviceName, $$);
}
else {
INetSim::Log::SubLog("[$rhost:$rport] recv: $facility.$severity $timestamp $content", $serviceName, $$);
}
$stat_success = 1;
}
else {
INetSim::Log::SubLog("[$rhost:$rport] recv: invalid syslog packet", $serviceName, $$);
}
INetSim::Log::SubLog("[$rhost:$rport] disconnect", $serviceName, $$);
}
if ($stat_success == 1) {
INetSim::Log::SubLog("[$rhost:$rport] stat: $stat_success facility=$facility severity=$severity", $serviceName, $$);
}
else {
INetSim::Log::SubLog("[$rhost:$rport] stat: $stat_success", $serviceName, $$);
}
}
sub _timestamp {
my @months = qw/Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec/;
my ($sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst) = localtime(INetSim::FakeTime::get_faketime());
$year += 1900;
return (sprintf("%3s %2s %02d:%02d:%02d", $months[$mon], $mday, $hour, $min, $sec));
}
sub dec_PRIORITY {
my $pri = shift;
my $fac;
my $sev;
if (defined ($pri) && length($pri) && $pri =~ /\A[\d]{1,3}\z/ && $pri >= 0 && $pri <= 191 && $pri ne "00" && $pri ne "000") {
$fac = ($pri & 248) >> 3;
$sev = $pri & 7;
return ($Facility{$fac}, $Severity{$sev});
}
return undef;
}
1;
#
|
