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|
package Sys::Syslog;
require 5.000;
require Exporter;
use Carp;
@ISA = qw(Exporter);
@EXPORT = qw(openlog closelog setlogmask syslog);
#
# syslog.pl
#
# $Log: syslog.pl,v $
#
# tom christiansen <tchrist@convex.com>
# modified to use sockets by Larry Wall <lwall@jpl-devvax.jpl.nasa.gov>
# NOTE: openlog now takes three arguments, just like openlog(3)
#
# call syslog() with a string priority and a list of printf() args
# like syslog(3)
#
# usage: use Syslog;
#
# then (put these all in a script to test function)
#
# openlog($program,'cons,pid','user');
# syslog('info','this is another test');
# syslog('mail|warning','this is a better test: %d', time);
# closelog();
#
# syslog('debug','this is the last test');
# openlog("$program $$",'ndelay','user');
# syslog('notice','fooprogram: this is really done');
#
# $! = 55;
# syslog('info','problem was %m'); # %m == $! in syslog(3)
$host = 'localhost' unless $host; # set $Syslog::host to change
require 'syslog.ph';
$maskpri = &LOG_UPTO(&LOG_DEBUG);
sub openlog {
($ident, $logopt, $facility) = @_; # package vars
$lo_pid = $logopt =~ /\bpid\b/;
$lo_ndelay = $logopt =~ /\bndelay\b/;
$lo_cons = $logopt =~ /\bcons\b/;
$lo_nowait = $logopt =~ /\bnowait\b/;
&connect if $lo_ndelay;
}
sub closelog {
$facility = $ident = '';
&disconnect;
}
sub setlogmask {
local($oldmask) = $maskpri;
$maskpri = shift;
$oldmask;
}
sub syslog {
local($priority) = shift;
local($mask) = shift;
local($message, $whoami);
local(@words, $num, $numpri, $numfac, $sum);
local($facility) = $facility; # may need to change temporarily.
croak "syslog: expected both priority and mask" unless $mask && $priority;
@words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility".
undef $numpri;
undef $numfac;
foreach (@words) {
$num = &xlate($_); # Translate word to number.
if (/^kern$/ || $num < 0) {
croak "syslog: invalid level/facility: $_";
}
elsif ($num <= &LOG_PRIMASK) {
croak "syslog: too many levels given: $_" if defined($numpri);
$numpri = $num;
return 0 unless &LOG_MASK($numpri) & $maskpri;
}
else {
croak "syslog: too many facilities given: $_" if defined($numfac);
$facility = $_;
$numfac = $num;
}
}
croak "syslog: level must be given" unless defined($numpri);
if (!defined($numfac)) { # Facility not specified in this call.
$facility = 'user' unless $facility;
$numfac = &xlate($facility);
}
&connect unless $connected;
$whoami = $ident;
if (!$ident && $mask =~ /^(\S.*):\s?(.*)/) {
$whoami = $1;
$mask = $2;
}
unless ($whoami) {
($whoami = getlogin) ||
($whoami = getpwuid($<)) ||
($whoami = 'syslog');
}
$whoami .= "[$$]" 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 $pid; # if fork failed, we're parent
close CONS;
}
}
}
}
sub xlate {
local($name) = @_;
$name =~ y/a-z/A-Z/;
$name = "LOG_$name" unless $name =~ /^LOG_/;
$name = "syslog'$name";
eval(&$name) || -1;
}
sub connect {
$pat = 'S n C4 x8';
$af_unix = 1;
$af_inet = 2;
$stream = 1;
$datagram = 2;
($name,$aliases,$proto) = getprotobyname('udp');
$udp = $proto;
($name,$aliase,$port,$proto) = getservbyname('syslog','udp');
$syslog = $port;
if (chop($myname = `hostname`)) {
($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($myname);
croak "Can't lookup $myname" 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);
croak "Can't lookup $host" unless $name;
@bytes = unpack("C4",$addrs[0]);
}
$that = pack($pat,$af_inet,$syslog,@bytes);
socket(SYSLOG,$af_inet,$datagram,$udp) || croak "socket: $!";
bind(SYSLOG,$this) || croak "bind: $!";
connect(SYSLOG,$that) || croak "connect: $!";
local($old) = select(SYSLOG); $| = 1; select($old);
$connected = 1;
}
sub disconnect {
close SYSLOG;
$connected = 0;
}
1;
|
