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1 | # |
2 | # syslog.pl |
3 | # |
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4 | # $Log: syslog.pl,v $ |
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5 | # Revision 4.0 91/03/20 01:26:24 lwall |
6 | # 4.0 baseline. |
7 | # |
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8 | # Revision 3.0.1.4 90/11/10 01:41:11 lwall |
9 | # patch38: syslog.pl was referencing an absolute path |
10 | # |
11 | # Revision 3.0.1.3 90/10/15 17:42:18 lwall |
12 | # patch29: various portability fixes |
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13 | # |
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14 | # Revision 3.0.1.1 90/08/09 03:57:17 lwall |
15 | # patch19: Initial revision |
16 | # |
17 | # Revision 1.2 90/06/11 18:45:30 18:45:30 root () |
18 | # - Changed 'warn' to 'mail|warning' in test call (to give example of |
19 | # facility specification, and because 'warn' didn't work on HP-UX). |
20 | # - Fixed typo in &openlog ("ncons" should be "cons"). |
21 | # - Added (package-global) $maskpri, and &setlogmask. |
22 | # - In &syslog: |
23 | # - put argument test ahead of &connect (why waste cycles?), |
24 | # - allowed facility to be specified in &syslog's first arg (temporarily |
25 | # overrides any $facility set in &openlog), just as in syslog(3C), |
26 | # - do a return 0 when bit for $numpri not set in log mask (see syslog(3C)), |
27 | # - changed $whoami code to use getlogin, getpwuid($<) and 'syslog' |
28 | # (in that order) when $ident is null, |
29 | # - made PID logging consistent with syslog(3C) and subject to $lo_pid only, |
30 | # - fixed typo in "print CONS" statement ($<facility should be <$facility). |
31 | # - changed \n to \r in print CONS (\r is useful, $message already has a \n). |
32 | # - Changed &xlate to return -1 for an unknown name, instead of croaking. |
33 | # |
34 | # |
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35 | # tom christiansen <tchrist@convex.com> |
36 | # modified to use sockets by Larry Wall <lwall@jpl-devvax.jpl.nasa.gov> |
37 | # NOTE: openlog now takes three arguments, just like openlog(3) |
38 | # |
39 | # call syslog() with a string priority and a list of printf() args |
40 | # like syslog(3) |
41 | # |
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42 | # usage: require 'syslog.pl'; |
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43 | # |
44 | # then (put these all in a script to test function) |
45 | # |
46 | # |
47 | # do openlog($program,'cons,pid','user'); |
48 | # do syslog('info','this is another test'); |
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49 | # do syslog('mail|warning','this is a better test: %d', time); |
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50 | # do closelog(); |
51 | # |
52 | # do syslog('debug','this is the last test'); |
53 | # do openlog("$program $$",'ndelay','user'); |
54 | # do syslog('notice','fooprogram: this is really done'); |
55 | # |
56 | # $! = 55; |
57 | # do syslog('info','problem was %m'); # %m == $! in syslog(3) |
58 | |
59 | package syslog; |
60 | |
61 | $host = 'localhost' unless $host; # set $syslog'host to change |
62 | |
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63 | require 'syslog.ph'; |
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64 | |
65 | $maskpri = &LOG_UPTO(&LOG_DEBUG); |
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66 | |
67 | sub main'openlog { |
68 | ($ident, $logopt, $facility) = @_; # package vars |
69 | $lo_pid = $logopt =~ /\bpid\b/; |
70 | $lo_ndelay = $logopt =~ /\bndelay\b/; |
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71 | $lo_cons = $logopt =~ /\bcons\b/; |
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72 | $lo_nowait = $logopt =~ /\bnowait\b/; |
73 | &connect if $lo_ndelay; |
74 | } |
75 | |
76 | sub main'closelog { |
77 | $facility = $ident = ''; |
78 | &disconnect; |
79 | } |
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80 | |
81 | sub main'setlogmask { |
82 | local($oldmask) = $maskpri; |
83 | $maskpri = shift; |
84 | $oldmask; |
85 | } |
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86 | |
87 | sub main'syslog { |
88 | local($priority) = shift; |
89 | local($mask) = shift; |
90 | local($message, $whoami); |
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91 | local(@words, $num, $numpri, $numfac, $sum); |
92 | local($facility) = $facility; # may need to change temporarily. |
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93 | |
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94 | die "syslog: expected both priority and mask" unless $mask && $priority; |
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95 | |
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96 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility". |
97 | undef $numpri; |
98 | undef $numfac; |
99 | foreach (@words) { |
100 | $num = &xlate($_); # Translate word to number. |
101 | if (/^kern$/ || $num < 0) { |
102 | die "syslog: invalid level/facility: $_\n"; |
103 | } |
104 | elsif ($num <= &LOG_PRIMASK) { |
105 | die "syslog: too many levels given: $_\n" if defined($numpri); |
106 | $numpri = $num; |
107 | return 0 unless &LOG_MASK($numpri) & $maskpri; |
108 | } |
109 | else { |
110 | die "syslog: too many facilities given: $_\n" if defined($numfac); |
111 | $facility = $_; |
112 | $numfac = $num; |
113 | } |
114 | } |
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115 | |
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116 | die "syslog: level must be given\n" unless defined($numpri); |
117 | |
118 | if (!defined($numfac)) { # Facility not specified in this call. |
119 | $facility = 'user' unless $facility; |
120 | $numfac = &xlate($facility); |
121 | } |
122 | |
123 | &connect unless $connected; |
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124 | |
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125 | $whoami = $ident; |
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126 | |
127 | if (!$ident && $mask =~ /^(\S.*):\s?(.*)/) { |
128 | $whoami = $1; |
129 | $mask = $2; |
130 | } |
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131 | |
132 | unless ($whoami) { |
133 | ($whoami = getlogin) || |
134 | ($whoami = getpwuid($<)) || |
135 | ($whoami = 'syslog'); |
136 | } |
137 | |
138 | $whoami .= "[$$]" if $lo_pid; |
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139 | |
140 | $mask =~ s/%m/$!/g; |
141 | $mask .= "\n" unless $mask =~ /\n$/; |
142 | $message = sprintf ($mask, @_); |
143 | |
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144 | $sum = $numpri + $numfac; |
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145 | unless (send(SYSLOG,"<$sum>$whoami: $message",0)) { |
146 | if ($lo_cons) { |
147 | if ($pid = fork) { |
148 | unless ($lo_nowait) { |
149 | do {$died = wait;} until $died == $pid || $died < 0; |
150 | } |
151 | } |
152 | else { |
153 | open(CONS,">/dev/console"); |
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154 | print CONS "<$facility.$priority>$whoami: $message\r"; |
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155 | exit if defined $pid; # if fork failed, we're parent |
156 | close CONS; |
157 | } |
158 | } |
159 | } |
160 | } |
161 | |
162 | sub xlate { |
163 | local($name) = @_; |
164 | $name =~ y/a-z/A-Z/; |
165 | $name = "LOG_$name" unless $name =~ /^LOG_/; |
166 | $name = "syslog'$name"; |
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167 | eval &$name || -1; |
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168 | } |
169 | |
170 | sub connect { |
171 | $pat = 'S n C4 x8'; |
172 | |
173 | $af_unix = 1; |
174 | $af_inet = 2; |
175 | |
176 | $stream = 1; |
177 | $datagram = 2; |
178 | |
179 | ($name,$aliases,$proto) = getprotobyname('udp'); |
180 | $udp = $proto; |
181 | |
182 | ($name,$aliase,$port,$proto) = getservbyname('syslog','udp'); |
183 | $syslog = $port; |
184 | |
185 | if (chop($myname = `hostname`)) { |
186 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($myname); |
187 | die "Can't lookup $myname\n" unless $name; |
188 | @bytes = unpack("C4",$addrs[0]); |
189 | } |
190 | else { |
191 | @bytes = (0,0,0,0); |
192 | } |
193 | $this = pack($pat, $af_inet, 0, @bytes); |
194 | |
195 | if ($host =~ /^\d+\./) { |
196 | @bytes = split(/\./,$host); |
197 | } |
198 | else { |
199 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($host); |
200 | die "Can't lookup $host\n" unless $name; |
201 | @bytes = unpack("C4",$addrs[0]); |
202 | } |
203 | $that = pack($pat,$af_inet,$syslog,@bytes); |
204 | |
205 | socket(SYSLOG,$af_inet,$datagram,$udp) || die "socket: $!\n"; |
206 | bind(SYSLOG,$this) || die "bind: $!\n"; |
207 | connect(SYSLOG,$that) || die "connect: $!\n"; |
208 | |
209 | local($old) = select(SYSLOG); $| = 1; select($old); |
210 | $connected = 1; |
211 | } |
212 | |
213 | sub disconnect { |
214 | close SYSLOG; |
215 | $connected = 0; |
216 | } |
217 | |
218 | 1; |