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1 | # |
2 | # syslog.pl |
3 | # |
4 | # $Log: nsyslog.pl,v $ |
5 | # Revision 3.0.1.1 90/08/09 03:57:17 lwall |
6 | # patch19: Initial revision |
7 | # |
8 | # Revision 1.2 90/06/11 18:45:30 18:45:30 root () |
9 | # - Changed 'warn' to 'mail|warning' in test call (to give example of |
10 | # facility specification, and because 'warn' didn't work on HP-UX). |
11 | # - Fixed typo in &openlog ("ncons" should be "cons"). |
12 | # - Added (package-global) $maskpri, and &setlogmask. |
13 | # - In &syslog: |
14 | # - put argument test ahead of &connect (why waste cycles?), |
15 | # - allowed facility to be specified in &syslog's first arg (temporarily |
16 | # overrides any $facility set in &openlog), just as in syslog(3C), |
17 | # - do a return 0 when bit for $numpri not set in log mask (see syslog(3C)), |
18 | # - changed $whoami code to use getlogin, getpwuid($<) and 'syslog' |
19 | # (in that order) when $ident is null, |
20 | # - made PID logging consistent with syslog(3C) and subject to $lo_pid only, |
21 | # - fixed typo in "print CONS" statement ($<facility should be <$facility). |
22 | # - changed \n to \r in print CONS (\r is useful, $message already has a \n). |
23 | # - Changed &xlate to return -1 for an unknown name, instead of croaking. |
24 | # |
25 | # |
26 | # tom christiansen <tchrist@convex.com> |
27 | # modified to use sockets by Larry Wall <lwall@jpl-devvax.jpl.nasa.gov> |
28 | # NOTE: openlog now takes three arguments, just like openlog(3) |
29 | # |
30 | # call syslog() with a string priority and a list of printf() args |
31 | # like syslog(3) |
32 | # |
33 | # usage: require 'syslog.pl'; |
34 | # |
35 | # then (put these all in a script to test function) |
36 | # |
37 | # |
38 | # do openlog($program,'cons,pid','user'); |
39 | # do syslog('info','this is another test'); |
40 | # do syslog('mail|warning','this is a better test: %d', time); |
41 | # do closelog(); |
42 | # |
43 | # do syslog('debug','this is the last test'); |
44 | # do openlog("$program $$",'ndelay','user'); |
45 | # do syslog('notice','fooprogram: this is really done'); |
46 | # |
47 | # $! = 55; |
48 | # do syslog('info','problem was %m'); # %m == $! in syslog(3) |
49 | |
50 | package syslog; |
51 | |
52 | $host = 'localhost' unless $host; # set $syslog'host to change |
53 | |
54 | require '/usr/local/lib/perl/syslog.ph'; |
55 | |
56 | $maskpri = &LOG_UPTO(&LOG_DEBUG); |
57 | |
58 | sub main'openlog { |
59 | ($ident, $logopt, $facility) = @_; # package vars |
60 | $lo_pid = $logopt =~ /\bpid\b/; |
61 | $lo_ndelay = $logopt =~ /\bndelay\b/; |
62 | $lo_cons = $logopt =~ /\bcons\b/; |
63 | $lo_nowait = $logopt =~ /\bnowait\b/; |
64 | &connect if $lo_ndelay; |
65 | } |
66 | |
67 | sub main'closelog { |
68 | $facility = $ident = ''; |
69 | &disconnect; |
70 | } |
71 | |
72 | sub main'setlogmask { |
73 | local($oldmask) = $maskpri; |
74 | $maskpri = shift; |
75 | $oldmask; |
76 | } |
77 | |
78 | sub main'syslog { |
79 | local($priority) = shift; |
80 | local($mask) = shift; |
81 | local($message, $whoami); |
82 | local(@words, $num, $numpri, $numfac, $sum); |
83 | local($facility) = $facility; # may need to change temporarily. |
84 | |
85 | die "syslog: expected both priority and mask" unless $mask && $priority; |
86 | |
87 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility". |
88 | undef $numpri; |
89 | undef $numfac; |
90 | foreach (@words) { |
91 | $num = &xlate($_); # Translate word to number. |
92 | if (/^kern$/ || $num < 0) { |
93 | die "syslog: invalid level/facility: $_\n"; |
94 | } |
95 | elsif ($num <= &LOG_PRIMASK) { |
96 | die "syslog: too many levels given: $_\n" if defined($numpri); |
97 | $numpri = $num; |
98 | return 0 unless &LOG_MASK($numpri) & $maskpri; |
99 | } |
100 | else { |
101 | die "syslog: too many facilities given: $_\n" if defined($numfac); |
102 | $facility = $_; |
103 | $numfac = $num; |
104 | } |
105 | } |
106 | |
107 | die "syslog: level must be given\n" unless defined($numpri); |
108 | |
109 | if (!defined($numfac)) { # Facility not specified in this call. |
110 | $facility = 'user' unless $facility; |
111 | $numfac = &xlate($facility); |
112 | } |
113 | |
114 | &connect unless $connected; |
115 | |
116 | $whoami = $ident; |
117 | |
118 | if (!$ident && $mask =~ /^(\S.*):\s?(.*)/) { |
119 | $whoami = $1; |
120 | $mask = $2; |
121 | } |
122 | |
123 | unless ($whoami) { |
124 | ($whoami = getlogin) || |
125 | ($whoami = getpwuid($<)) || |
126 | ($whoami = 'syslog'); |
127 | } |
128 | |
129 | $whoami .= "[$$]" if $lo_pid; |
130 | |
131 | $mask =~ s/%m/$!/g; |
132 | $mask .= "\n" unless $mask =~ /\n$/; |
133 | $message = sprintf ($mask, @_); |
134 | |
135 | $sum = $numpri + $numfac; |
136 | unless (send(SYSLOG,"<$sum>$whoami: $message",0)) { |
137 | if ($lo_cons) { |
138 | if ($pid = fork) { |
139 | unless ($lo_nowait) { |
140 | do {$died = wait;} until $died == $pid || $died < 0; |
141 | } |
142 | } |
143 | else { |
144 | open(CONS,">/dev/console"); |
145 | print CONS "<$facility.$priority>$whoami: $message\r"; |
146 | exit if defined $pid; # if fork failed, we're parent |
147 | close CONS; |
148 | } |
149 | } |
150 | } |
151 | } |
152 | |
153 | sub xlate { |
154 | local($name) = @_; |
155 | $name =~ y/a-z/A-Z/; |
156 | $name = "LOG_$name" unless $name =~ /^LOG_/; |
157 | $name = "syslog'$name"; |
158 | eval &$name || -1; |
159 | } |
160 | |
161 | sub connect { |
162 | $pat = 'S n C4 x8'; |
163 | |
164 | $af_unix = 1; |
165 | $af_inet = 2; |
166 | |
167 | $stream = 1; |
168 | $datagram = 2; |
169 | |
170 | ($name,$aliases,$proto) = getprotobyname('udp'); |
171 | $udp = $proto; |
172 | |
173 | ($name,$aliase,$port,$proto) = getservbyname('syslog','udp'); |
174 | $syslog = $port; |
175 | |
176 | if (chop($myname = `hostname`)) { |
177 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($myname); |
178 | die "Can't lookup $myname\n" unless $name; |
179 | @bytes = unpack("C4",$addrs[0]); |
180 | } |
181 | else { |
182 | @bytes = (0,0,0,0); |
183 | } |
184 | $this = pack($pat, $af_inet, 0, @bytes); |
185 | |
186 | if ($host =~ /^\d+\./) { |
187 | @bytes = split(/\./,$host); |
188 | } |
189 | else { |
190 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($host); |
191 | die "Can't lookup $host\n" unless $name; |
192 | @bytes = unpack("C4",$addrs[0]); |
193 | } |
194 | $that = pack($pat,$af_inet,$syslog,@bytes); |
195 | |
196 | socket(SYSLOG,$af_inet,$datagram,$udp) || die "socket: $!\n"; |
197 | bind(SYSLOG,$this) || die "bind: $!\n"; |
198 | connect(SYSLOG,$that) || die "connect: $!\n"; |
199 | |
200 | local($old) = select(SYSLOG); $| = 1; select($old); |
201 | $connected = 1; |
202 | } |
203 | |
204 | sub disconnect { |
205 | close SYSLOG; |
206 | $connected = 0; |
207 | } |
208 | |
209 | 1; |