| 1 | # |
| 2 | # syslog.pl |
| 3 | # |
| 4 | # $Log: syslog.pl,v $ |
| 5 | # |
| 6 | # tom christiansen <tchrist@convex.com> |
| 7 | # modified to use sockets by Larry Wall <lwall@jpl-devvax.jpl.nasa.gov> |
| 8 | # NOTE: openlog now takes three arguments, just like openlog(3) |
| 9 | # |
| 10 | # call syslog() with a string priority and a list of printf() args |
| 11 | # like syslog(3) |
| 12 | # |
| 13 | # usage: require 'syslog.pl'; |
| 14 | # |
| 15 | # then (put these all in a script to test function) |
| 16 | # |
| 17 | # |
| 18 | # do openlog($program,'cons,pid','user'); |
| 19 | # do syslog('info','this is another test'); |
| 20 | # do syslog('mail|warning','this is a better test: %d', time); |
| 21 | # do closelog(); |
| 22 | # |
| 23 | # do syslog('debug','this is the last test'); |
| 24 | # do openlog("$program $$",'ndelay','user'); |
| 25 | # do syslog('notice','fooprogram: this is really done'); |
| 26 | # |
| 27 | # $! = 55; |
| 28 | # do syslog('info','problem was %m'); # %m == $! in syslog(3) |
| 29 | |
| 30 | package syslog; |
| 31 | |
| 32 | use warnings::register; |
| 33 | |
| 34 | $host = 'localhost' unless $host; # set $syslog'host to change |
| 35 | |
| 36 | if ($] >= 5 && warnings::enabled()) { |
| 37 | warnings::warn("You should 'use Sys::Syslog' instead; continuing"); |
| 38 | } |
| 39 | |
| 40 | require 'syslog.ph'; |
| 41 | |
| 42 | eval 'use Socket; 1' || |
| 43 | eval { require "socket.ph" } || |
| 44 | require "sys/socket.ph"; |
| 45 | |
| 46 | $maskpri = &LOG_UPTO(&LOG_DEBUG); |
| 47 | |
| 48 | sub main'openlog { |
| 49 | ($ident, $logopt, $facility) = @_; # package vars |
| 50 | $lo_pid = $logopt =~ /\bpid\b/; |
| 51 | $lo_ndelay = $logopt =~ /\bndelay\b/; |
| 52 | $lo_cons = $logopt =~ /\bcons\b/; |
| 53 | $lo_nowait = $logopt =~ /\bnowait\b/; |
| 54 | &connect if $lo_ndelay; |
| 55 | } |
| 56 | |
| 57 | sub main'closelog { |
| 58 | $facility = $ident = ''; |
| 59 | &disconnect; |
| 60 | } |
| 61 | |
| 62 | sub main'setlogmask { |
| 63 | local($oldmask) = $maskpri; |
| 64 | $maskpri = shift; |
| 65 | $oldmask; |
| 66 | } |
| 67 | |
| 68 | sub main'syslog { |
| 69 | local($priority) = shift; |
| 70 | local($mask) = shift; |
| 71 | local($message, $whoami); |
| 72 | local(@words, $num, $numpri, $numfac, $sum); |
| 73 | local($facility) = $facility; # may need to change temporarily. |
| 74 | |
| 75 | die "syslog: expected both priority and mask" unless $mask && $priority; |
| 76 | |
| 77 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility". |
| 78 | undef $numpri; |
| 79 | undef $numfac; |
| 80 | foreach (@words) { |
| 81 | $num = &xlate($_); # Translate word to number. |
| 82 | if (/^kern$/ || $num < 0) { |
| 83 | die "syslog: invalid level/facility: $_\n"; |
| 84 | } |
| 85 | elsif ($num <= &LOG_PRIMASK) { |
| 86 | die "syslog: too many levels given: $_\n" if defined($numpri); |
| 87 | $numpri = $num; |
| 88 | return 0 unless &LOG_MASK($numpri) & $maskpri; |
| 89 | } |
| 90 | else { |
| 91 | die "syslog: too many facilities given: $_\n" if defined($numfac); |
| 92 | $facility = $_; |
| 93 | $numfac = $num; |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | die "syslog: level must be given\n" unless defined($numpri); |
| 98 | |
| 99 | if (!defined($numfac)) { # Facility not specified in this call. |
| 100 | $facility = 'user' unless $facility; |
| 101 | $numfac = &xlate($facility); |
| 102 | } |
| 103 | |
| 104 | &connect unless $connected; |
| 105 | |
| 106 | $whoami = $ident; |
| 107 | |
| 108 | if (!$ident && $mask =~ /^(\S.*):\s?(.*)/) { |
| 109 | $whoami = $1; |
| 110 | $mask = $2; |
| 111 | } |
| 112 | |
| 113 | unless ($whoami) { |
| 114 | ($whoami = getlogin) || |
| 115 | ($whoami = getpwuid($<)) || |
| 116 | ($whoami = 'syslog'); |
| 117 | } |
| 118 | |
| 119 | $whoami .= "[$$]" if $lo_pid; |
| 120 | |
| 121 | $mask =~ s/%m/$!/g; |
| 122 | $mask .= "\n" unless $mask =~ /\n$/; |
| 123 | $message = sprintf ($mask, @_); |
| 124 | |
| 125 | $sum = $numpri + $numfac; |
| 126 | unless (send(SYSLOG,"<$sum>$whoami: $message",0)) { |
| 127 | if ($lo_cons) { |
| 128 | if ($pid = fork) { |
| 129 | unless ($lo_nowait) { |
| 130 | do {$died = wait;} until $died == $pid || $died < 0; |
| 131 | } |
| 132 | } |
| 133 | else { |
| 134 | open(CONS,">/dev/console"); |
| 135 | print CONS "<$facility.$priority>$whoami: $message\r"; |
| 136 | exit if defined $pid; # if fork failed, we're parent |
| 137 | close CONS; |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | sub xlate { |
| 144 | local($name) = @_; |
| 145 | $name = uc $name; |
| 146 | $name = "LOG_$name" unless $name =~ /^LOG_/; |
| 147 | $name = "syslog'$name"; |
| 148 | defined &$name ? &$name : -1; |
| 149 | } |
| 150 | |
| 151 | sub connect { |
| 152 | $pat = 'S n C4 x8'; |
| 153 | |
| 154 | $af_unix = &AF_UNIX; |
| 155 | $af_inet = &AF_INET; |
| 156 | |
| 157 | $stream = &SOCK_STREAM; |
| 158 | $datagram = &SOCK_DGRAM; |
| 159 | |
| 160 | ($name,$aliases,$proto) = getprotobyname('udp'); |
| 161 | $udp = $proto; |
| 162 | |
| 163 | ($name,$aliases,$port,$proto) = getservbyname('syslog','udp'); |
| 164 | $syslog = $port; |
| 165 | |
| 166 | if (chop($myname = `hostname`)) { |
| 167 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($myname); |
| 168 | die "Can't lookup $myname\n" unless $name; |
| 169 | @bytes = unpack("C4",$addrs[0]); |
| 170 | } |
| 171 | else { |
| 172 | @bytes = (0,0,0,0); |
| 173 | } |
| 174 | $this = pack($pat, $af_inet, 0, @bytes); |
| 175 | |
| 176 | if ($host =~ /^\d+\./) { |
| 177 | @bytes = split(/\./,$host); |
| 178 | } |
| 179 | else { |
| 180 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($host); |
| 181 | die "Can't lookup $host\n" unless $name; |
| 182 | @bytes = unpack("C4",$addrs[0]); |
| 183 | } |
| 184 | $that = pack($pat,$af_inet,$syslog,@bytes); |
| 185 | |
| 186 | socket(SYSLOG,$af_inet,$datagram,$udp) || die "socket: $!\n"; |
| 187 | bind(SYSLOG,$this) || die "bind: $!\n"; |
| 188 | connect(SYSLOG,$that) || die "connect: $!\n"; |
| 189 | |
| 190 | local($old) = select(SYSLOG); $| = 1; select($old); |
| 191 | $connected = 1; |
| 192 | } |
| 193 | |
| 194 | sub disconnect { |
| 195 | close SYSLOG; |
| 196 | $connected = 0; |
| 197 | } |
| 198 | |
| 199 | 1; |