—

              
package Sys::Syslog;
require 5.000;
require Exporter;
use Carp;
@ISA = qw(Exporter);
@EXPORT = qw(openlog closelog setlogmask syslog);
use Socket;
use Sys::Hostname;
# adapted from syslog.pl
#
# 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)
HideShow 75 lines of Pod
=head1 NAME
Sys::Syslog, openlog, closelog, setlogmask, syslog - Perl interface to the UNIX syslog(3) calls
=head1 SYNOPSIS
    use Sys::Syslog;
    openlog $ident, $logopt, $facility;
    syslog $priority, $format, @args;
    $oldmask = setlogmask $mask_priority;
    closelog;
=head1 DESCRIPTION
Sys::Syslog is an interface to the UNIX C<syslog(3)> program.
Call C<syslog()> with a string priority and a list of C<printf()> args
just like C<syslog(3)>.
Syslog provides the functions:
=over
=item openlog $ident, $logopt, $facility
I<$ident> is prepended to every message.
I<$logopt> contains one or more of the words I<pid>, I<ndelay>, I<cons>, I<nowait>.
I<$facility> specifies the part of the system
=item syslog $priority, $format, @args
If I<$priority> permits, logs I<($format, @args)>
printed as by C<printf(3V)>, with the addition that I<%m>
is replaced with C<"$!"> (the latest error message).
=item setlogmask $mask_priority
Sets log mask I<$mask_priority> and returns the old mask.
=item closelog
Closes the log file.
=back
Note that C<openlog> now takes three arguments, just like C<openlog(3)>.
=head1 EXAMPLES
    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)
=head1 DEPENDENCIES
B<Sys::Syslog> needs F<syslog.ph>, which can be created with C<h2ph>.
=head1 SEE ALSO
L<syslog(3)>
=head1 AUTHOR
Tom Christiansen E<lt>F<tchrist@perl.com>E<gt> and Larry Wall E<lt>F<larry@wall.org>E<gt>
=cut
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) {
                    $died = waitpid($pid, 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 = uc $name;
    $name = "LOG_$name" unless $name =~ /^LOG_/;
    $name = "Sys::Syslog::$name";
    defined &$name ? &$name : -1;
}
sub connect {
    unless ($host) {
        require Sys::Hostname;
        my($host_uniq) = Sys::Hostname::hostname();
        ($host) = $host_uniq =~ /(\w+)/;
    }
    my $udp = getprotobyname('udp');
    my $syslog = getservbyname('syslog','udp');
    my $this = sockaddr_in($syslog, INADDR_ANY);
    my $that = sockaddr_in($syslog, inet_aton($host) || croak "Can't lookup $host");
    socket(SYSLOG,AF_INET,SOCK_DGRAM,$udp)           || croak "socket: $!";
    connect(SYSLOG,$that)                            || croak "connect: $!";
    local($old) = select(SYSLOG); $| = 1; select($old);
    $connected = 1;
}
sub disconnect {
    close SYSLOG;
    $connected = 0;
}
1;