package syslog;
use warnings::register;
$host = 'localhost' unless $host;
if ($] >= 5 && warnings::enabled()) {
warnings::warn("You should 'use Sys::Syslog' instead; continuing");
}
require 'syslog.ph';
eval 'use Socket; 1' ||
eval { require "socket.ph" } ||
require "sys/socket.ph";
$maskpri = &LOG_UPTO(&LOG_DEBUG);
sub main'openlog {
($ident, $logopt, $facility) = @_; # package vars
$lo_pid = $logopt =~ /\bpid\b/;
$lo_ndelay = $logopt =~ /\bndelay\b/;
$lo_cons = $logopt =~ /\bcons\b/;
$lo_nowait = $logopt =~ /\bnowait\b/;
&connect if $lo_ndelay;
}
sub main'closelog {
$facility = $ident = '';
&disconnect;
}
sub main'setlogmask {
local($oldmask) = $maskpri;
$maskpri = shift;
$oldmask;
}
sub main'syslog {
local($priority) = shift;
local($mask) = shift;
local($message, $whoami);
local(@words, $num, $numpri, $numfac, $sum);
local($facility) = $facility;
die "syslog: expected both priority and mask" unless $mask && $priority;
@words = split(/\W+/, $priority, 2); undef $numpri;
undef $numfac;
foreach (@words) {
$num = &xlate($_); if (/^kern$/ || $num < 0) {
die "syslog: invalid level/facility: $_\n";
}
elsif ($num <= &LOG_PRIMASK) {
die "syslog: too many levels given: $_\n" if defined($numpri);
$numpri = $num;
return 0 unless &LOG_MASK($numpri) & $maskpri;
}
else {
die "syslog: too many facilities given: $_\n" if defined($numfac);
$facility = $_;
$numfac = $num;
}
}
die "syslog: level must be given\n" unless defined($numpri);
if (!defined($numfac)) { $facility = 'user' unless $facility;
$numfac = &xlate($facility);
}
&connect unless $connected;
$whoami = $ident;
if (!$ident && $mask =~ /^(\S.*):\s?(.*)/) {
$whoami = $1;
$mask = $2;
}
unless ($whoami) {
($whoami = getlogin) ||
($whoami = getpwuid($<)) ||
($whoami = 'syslog');
}
$whoami .= "[$$]" if $lo_pid;
$mask =~ s/%m/$!/g;
$mask .= "\n" unless $mask =~ /\n$/;
$message = sprintf ($mask, @_);
$sum = $numpri + $numfac;
unless (send(SYSLOG,"<$sum>$whoami: $message",0)) {
if ($lo_cons) {
if ($pid = fork) {
unless ($lo_nowait) {
do {$died = wait;} until $died == $pid || $died < 0;
}
}
else {
open(CONS,">/dev/console");
print CONS "<$facility.$priority>$whoami: $message\r";
exit if defined $pid; close CONS;
}
}
}
}
sub xlate {
local($name) = @_;
$name = uc $name;
$name = "LOG_$name" unless $name =~ /^LOG_/;
$name = "syslog'$name";
defined &$name ? &$name : -1;
}
sub connect {
$pat = 'S n C4 x8';
$af_unix = &AF_UNIX;
$af_inet = &AF_INET;
$stream = &SOCK_STREAM;
$datagram = &SOCK_DGRAM;
($name,$aliases,$proto) = getprotobyname('udp');
$udp = $proto;
($name,$aliases,$port,$proto) = getservbyname('syslog','udp');
$syslog = $port;
if (chop($myname = `hostname`)) {
($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($myname);
die "Can't lookup $myname\n" unless $name;
@bytes = unpack("C4",$addrs[0]);
}
else {
@bytes = (0,0,0,0);
}
$this = pack($pat, $af_inet, 0, @bytes);
if ($host =~ /^\d+\./) {
@bytes = split(/\./,$host);
}
else {
($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($host);
die "Can't lookup $host\n" unless $name;
@bytes = unpack("C4",$addrs[0]);
}
$that = pack($pat,$af_inet,$syslog,@bytes);
socket(SYSLOG,$af_inet,$datagram,$udp) || die "socket: $!\n";
bind(SYSLOG,$this) || die "bind: $!\n";
connect(SYSLOG,$that) || die "connect: $!\n";
local($old) = select(SYSLOG); $| = 1; select($old);
$connected = 1;
}
sub disconnect {
close SYSLOG;
$connected = 0;
}
1;