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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;
-