diff options
Diffstat (limited to 'lib/Sys/Syslog.pm')
| -rw-r--r-- | lib/Sys/Syslog.pm | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/lib/Sys/Syslog.pm b/lib/Sys/Syslog.pm new file mode 100644 index 0000000000..0f7859e226 --- /dev/null +++ b/lib/Sys/Syslog.pm @@ -0,0 +1,195 @@ +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; + |