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#
# syslog.pl
#
# $Log: syslog.pl,v $
# Revision 4.0.1.1 92/06/08 13:48:05 lwall
# patch20: new warning for ambiguous use of unary operators
#
# Revision 4.0 91/03/20 01:26:24 lwall
# 4.0 baseline.
#
# Revision 3.0.1.4 90/11/10 01:41:11 lwall
# patch38: syslog.pl was referencing an absolute path
#
# Revision 3.0.1.3 90/10/15 17:42:18 lwall
# patch29: various portability fixes
#
# Revision 3.0.1.1 90/08/09 03:57:17 lwall
# patch19: Initial revision
#
# Revision 1.2 90/06/11 18:45:30 18:45:30 root ()
# - Changed 'warn' to 'mail|warning' in test call (to give example of
# facility specification, and because 'warn' didn't work on HP-UX).
# - Fixed typo in &openlog ("ncons" should be "cons").
# - Added (package-global) $maskpri, and &setlogmask.
# - In &syslog:
# - put argument test ahead of &connect (why waste cycles?),
# - allowed facility to be specified in &syslog's first arg (temporarily
# overrides any $facility set in &openlog), just as in syslog(3C),
# - do a return 0 when bit for $numpri not set in log mask (see syslog(3C)),
# - changed $whoami code to use getlogin, getpwuid($<) and 'syslog'
# (in that order) when $ident is null,
# - made PID logging consistent with syslog(3C) and subject to $lo_pid only,
# - fixed typo in "print CONS" statement ($<facility should be <$facility).
# - changed \n to \r in print CONS (\r is useful, $message already has a \n).
# - Changed &xlate to return -1 for an unknown name, instead of croaking.
#
#
# tom christiansen <tchrist@convex.com>
# modified to use sockets by Larry Wall <lwall@jpl-devvax.jpl.nasa.gov>
# NOTE: openlog now takes three arguments, just like openlog(3)
#
# call syslog() with a string priority and a list of printf() args
# like syslog(3)
#
# usage: require 'syslog.pl';
#
# then (put these all in a script to test function)
#
#
# do openlog($program,'cons,pid','user');
# do syslog('info','this is another test');
# do syslog('mail|warning','this is a better test: %d', time);
# do closelog();
#
# do syslog('debug','this is the last test');
# do openlog("$program $$",'ndelay','user');
# do syslog('notice','fooprogram: this is really done');
#
# $! = 55;
# do syslog('info','problem was %m'); # %m == $! in syslog(3)
package syslog;
$host = 'localhost' unless $host; # set $syslog'host to change
require 'syslog.ph';
$maskpri = &LOG_UPTO(&LOG_DEBUG);
sub main'openlog {
($ident, $logopt, $facility) = @_; # package vars
$lo_pid = $logopt =~ /\bpid\b/;
$lo_ndelay = $logopt =~ /\bndelay\b/;
$lo_cons = $logopt =~ /\bcons\b/;
$lo_nowait = $logopt =~ /\bnowait\b/;
&connect if $lo_ndelay;
}
sub main'closelog {
$facility = $ident = '';
&disconnect;
}
sub main'setlogmask {
local($oldmask) = $maskpri;
$maskpri = shift;
$oldmask;
}
sub main'syslog {
local($priority) = shift;
local($mask) = shift;
local($message, $whoami);
local(@words, $num, $numpri, $numfac, $sum);
local($facility) = $facility; # may need to change temporarily.
die "syslog: expected both priority and mask" unless $mask && $priority;
@words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility".
undef $numpri;
undef $numfac;
foreach (@words) {
$num = &xlate($_); # Translate word to number.
if (/^kern$/ || $num < 0) {
die "syslog: invalid level/facility: $_\n";
}
elsif ($num <= &LOG_PRIMASK) {
die "syslog: too many levels given: $_\n" if defined($numpri);
$numpri = $num;
return 0 unless &LOG_MASK($numpri) & $maskpri;
}
else {
die "syslog: too many facilities given: $_\n" if defined($numfac);
$facility = $_;
$numfac = $num;
}
}
die "syslog: level must be given\n" unless defined($numpri);
if (!defined($numfac)) { # Facility not specified in this call.
$facility = 'user' unless $facility;
$numfac = &xlate($facility);
}
&connect unless $connected;
$whoami = $ident;
if (!$ident && $mask =~ /^(\S.*):\s?(.*)/) {
$whoami = $1;
$mask = $2;
}
unless ($whoami) {
($whoami = getlogin) ||
($whoami = getpwuid($<)) ||
($whoami = 'syslog');
}
$whoami .= "[$$]" 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);
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;
|
