1#
2# syslog.pl
3#
4# $Log: syslog.pl,v $
5# Revision 1.7  2003/12/03 03:02:36  millert
6# Resolve conflicts for perl 5.8.2, remove old files, and add OpenBSD-specific scaffolding
7#
8#
9# tom christiansen <tchrist@convex.com>
10# modified to use sockets by Larry Wall <lwall@jpl-devvax.jpl.nasa.gov>
11# NOTE: openlog now takes three arguments, just like openlog(3)
12#
13# call syslog() with a string priority and a list of printf() args
14# like syslog(3)
15#
16#  usage: require 'syslog.pl';
17#
18#  then (put these all in a script to test function)
19#
20#
21#	do openlog($program,'cons,pid','user');
22#	do syslog('info','this is another test');
23#	do syslog('mail|warning','this is a better test: %d', time);
24#	do closelog();
25#
26#	do syslog('debug','this is the last test');
27#	do openlog("$program $$",'ndelay','user');
28#	do syslog('notice','fooprogram: this is really done');
29#
30#	$! = 55;
31#	do syslog('info','problem was %m'); # %m == $! in syslog(3)
32
33package syslog;
34
35use warnings::register;
36
37$host = 'localhost' unless $host;	# set $syslog'host to change
38
39if ($] >= 5 && warnings::enabled()) {
40    warnings::warn("You should 'use Sys::Syslog' instead; continuing");
41}
42
43require 'syslog.ph';
44
45 eval 'use Socket; 1' 			||
46     eval { require "socket.ph" } 	||
47     require "sys/socket.ph";
48
49$maskpri = &LOG_UPTO(&LOG_DEBUG);
50
51sub main'openlog {
52    ($ident, $logopt, $facility) = @_;  # package vars
53    $lo_pid = $logopt =~ /\bpid\b/;
54    $lo_ndelay = $logopt =~ /\bndelay\b/;
55    $lo_cons = $logopt =~ /\bcons\b/;
56    $lo_nowait = $logopt =~ /\bnowait\b/;
57    &connect if $lo_ndelay;
58}
59
60sub main'closelog {
61    $facility = $ident = '';
62    &disconnect;
63}
64
65sub main'setlogmask {
66    local($oldmask) = $maskpri;
67    $maskpri = shift;
68    $oldmask;
69}
70
71sub main'syslog {
72    local($priority) = shift;
73    local($mask) = shift;
74    local($message, $whoami);
75    local(@words, $num, $numpri, $numfac, $sum);
76    local($facility) = $facility;	# may need to change temporarily.
77
78    die "syslog: expected both priority and mask" unless $mask && $priority;
79
80    @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility".
81    undef $numpri;
82    undef $numfac;
83    foreach (@words) {
84	$num = &xlate($_);		# Translate word to number.
85	if (/^kern$/ || $num < 0) {
86	    die "syslog: invalid level/facility: $_\n";
87	}
88	elsif ($num <= &LOG_PRIMASK) {
89	    die "syslog: too many levels given: $_\n" if defined($numpri);
90	    $numpri = $num;
91	    return 0 unless &LOG_MASK($numpri) & $maskpri;
92	}
93	else {
94	    die "syslog: too many facilities given: $_\n" if defined($numfac);
95	    $facility = $_;
96	    $numfac = $num;
97	}
98    }
99
100    die "syslog: level must be given\n" unless defined($numpri);
101
102    if (!defined($numfac)) {	# Facility not specified in this call.
103	$facility = 'user' unless $facility;
104	$numfac = &xlate($facility);
105    }
106
107    &connect unless $connected;
108
109    $whoami = $ident;
110
111    if (!$ident && $mask =~ /^(\S.*):\s?(.*)/) {
112	$whoami = $1;
113	$mask = $2;
114    }
115
116    unless ($whoami) {
117	($whoami = getlogin) ||
118	    ($whoami = getpwuid($<)) ||
119		($whoami = 'syslog');
120    }
121
122    $whoami .= "[$$]" if $lo_pid;
123
124    $mask =~ s/%m/$!/g;
125    $mask .= "\n" unless $mask =~ /\n$/;
126    $message = sprintf ($mask, @_);
127
128    $sum = $numpri + $numfac;
129    unless (send(SYSLOG,"<$sum>$whoami: $message",0)) {
130	if ($lo_cons) {
131	    if ($pid = fork) {
132		unless ($lo_nowait) {
133		    do {$died = wait;} until $died == $pid || $died < 0;
134		}
135	    }
136	    else {
137		open(CONS,">/dev/console");
138		print CONS "<$facility.$priority>$whoami: $message\r";
139		exit if defined $pid;		# if fork failed, we're parent
140		close CONS;
141	    }
142	}
143    }
144}
145
146sub xlate {
147    local($name) = @_;
148    $name = uc $name;
149    $name = "LOG_$name" unless $name =~ /^LOG_/;
150    $name = "syslog'$name";
151    defined &$name ? &$name : -1;
152}
153
154sub connect {
155    $pat = 'S n C4 x8';
156
157    $af_unix = &AF_UNIX;
158    $af_inet = &AF_INET;
159
160    $stream = &SOCK_STREAM;
161    $datagram = &SOCK_DGRAM;
162
163    ($name,$aliases,$proto) = getprotobyname('udp');
164    $udp = $proto;
165
166    ($name,$aliases,$port,$proto) = getservbyname('syslog','udp');
167    $syslog = $port;
168
169    if (chop($myname = `hostname`)) {
170	($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($myname);
171	die "Can't lookup $myname\n" unless $name;
172	@bytes = unpack("C4",$addrs[0]);
173    }
174    else {
175	@bytes = (0,0,0,0);
176    }
177    $this = pack($pat, $af_inet, 0, @bytes);
178
179    if ($host =~ /^\d+\./) {
180	@bytes = split(/\./,$host);
181    }
182    else {
183	($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($host);
184	die "Can't lookup $host\n" unless $name;
185	@bytes = unpack("C4",$addrs[0]);
186    }
187    $that = pack($pat,$af_inet,$syslog,@bytes);
188
189    socket(SYSLOG,$af_inet,$datagram,$udp) || die "socket: $!\n";
190    bind(SYSLOG,$this) || die "bind: $!\n";
191    connect(SYSLOG,$that) || die "connect: $!\n";
192
193    local($old) = select(SYSLOG); $| = 1; select($old);
194    $connected = 1;
195}
196
197sub disconnect {
198    close SYSLOG;
199    $connected = 0;
200}
201
2021;
203