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a0d0e21e |
1 | package Sys::Syslog; |
2 | require 5.000; |
3 | require Exporter; |
4 | use Carp; |
5 | |
6 | @ISA = qw(Exporter); |
7 | @EXPORT = qw(openlog closelog setlogmask syslog); |
8 | |
9 | # |
10 | # syslog.pl |
11 | # |
12 | # $Log: syslog.pl,v $ |
13 | # |
14 | # tom christiansen <tchrist@convex.com> |
15 | # modified to use sockets by Larry Wall <lwall@jpl-devvax.jpl.nasa.gov> |
16 | # NOTE: openlog now takes three arguments, just like openlog(3) |
17 | # |
18 | # call syslog() with a string priority and a list of printf() args |
19 | # like syslog(3) |
20 | # |
21 | # usage: use Syslog; |
22 | # |
23 | # then (put these all in a script to test function) |
24 | # |
25 | # openlog($program,'cons,pid','user'); |
26 | # syslog('info','this is another test'); |
27 | # syslog('mail|warning','this is a better test: %d', time); |
28 | # closelog(); |
29 | # |
30 | # syslog('debug','this is the last test'); |
31 | # openlog("$program $$",'ndelay','user'); |
32 | # syslog('notice','fooprogram: this is really done'); |
33 | # |
34 | # $! = 55; |
35 | # syslog('info','problem was %m'); # %m == $! in syslog(3) |
36 | |
37 | $host = 'localhost' unless $host; # set $Syslog::host to change |
38 | |
39 | require 'syslog.ph'; |
40 | |
41 | $maskpri = &LOG_UPTO(&LOG_DEBUG); |
42 | |
43 | sub openlog { |
44 | ($ident, $logopt, $facility) = @_; # package vars |
45 | $lo_pid = $logopt =~ /\bpid\b/; |
46 | $lo_ndelay = $logopt =~ /\bndelay\b/; |
47 | $lo_cons = $logopt =~ /\bcons\b/; |
48 | $lo_nowait = $logopt =~ /\bnowait\b/; |
49 | &connect if $lo_ndelay; |
50 | } |
51 | |
52 | sub closelog { |
53 | $facility = $ident = ''; |
54 | &disconnect; |
55 | } |
56 | |
57 | sub setlogmask { |
58 | local($oldmask) = $maskpri; |
59 | $maskpri = shift; |
60 | $oldmask; |
61 | } |
62 | |
63 | sub syslog { |
64 | local($priority) = shift; |
65 | local($mask) = shift; |
66 | local($message, $whoami); |
67 | local(@words, $num, $numpri, $numfac, $sum); |
68 | local($facility) = $facility; # may need to change temporarily. |
69 | |
70 | croak "syslog: expected both priority and mask" unless $mask && $priority; |
71 | |
72 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility". |
73 | undef $numpri; |
74 | undef $numfac; |
75 | foreach (@words) { |
76 | $num = &xlate($_); # Translate word to number. |
77 | if (/^kern$/ || $num < 0) { |
78 | croak "syslog: invalid level/facility: $_"; |
79 | } |
80 | elsif ($num <= &LOG_PRIMASK) { |
81 | croak "syslog: too many levels given: $_" if defined($numpri); |
82 | $numpri = $num; |
83 | return 0 unless &LOG_MASK($numpri) & $maskpri; |
84 | } |
85 | else { |
86 | croak "syslog: too many facilities given: $_" if defined($numfac); |
87 | $facility = $_; |
88 | $numfac = $num; |
89 | } |
90 | } |
91 | |
92 | croak "syslog: level must be given" unless defined($numpri); |
93 | |
94 | if (!defined($numfac)) { # Facility not specified in this call. |
95 | $facility = 'user' unless $facility; |
96 | $numfac = &xlate($facility); |
97 | } |
98 | |
99 | &connect unless $connected; |
100 | |
101 | $whoami = $ident; |
102 | |
103 | if (!$ident && $mask =~ /^(\S.*):\s?(.*)/) { |
104 | $whoami = $1; |
105 | $mask = $2; |
106 | } |
107 | |
108 | unless ($whoami) { |
109 | ($whoami = getlogin) || |
110 | ($whoami = getpwuid($<)) || |
111 | ($whoami = 'syslog'); |
112 | } |
113 | |
114 | $whoami .= "[$$]" if $lo_pid; |
115 | |
116 | $mask =~ s/%m/$!/g; |
117 | $mask .= "\n" unless $mask =~ /\n$/; |
118 | $message = sprintf ($mask, @_); |
119 | |
120 | $sum = $numpri + $numfac; |
121 | unless (send(SYSLOG,"<$sum>$whoami: $message",0)) { |
122 | if ($lo_cons) { |
123 | if ($pid = fork) { |
124 | unless ($lo_nowait) { |
125 | do {$died = wait;} until $died == $pid || $died < 0; |
126 | } |
127 | } |
128 | else { |
129 | open(CONS,">/dev/console"); |
130 | print CONS "<$facility.$priority>$whoami: $message\r"; |
131 | exit if defined $pid; # if fork failed, we're parent |
132 | close CONS; |
133 | } |
134 | } |
135 | } |
136 | } |
137 | |
138 | sub xlate { |
139 | local($name) = @_; |
140 | $name =~ y/a-z/A-Z/; |
141 | $name = "LOG_$name" unless $name =~ /^LOG_/; |
748a9306 |
142 | $name = "Sys::Syslog::$name"; |
a0d0e21e |
143 | eval(&$name) || -1; |
144 | } |
145 | |
146 | sub connect { |
147 | $pat = 'S n C4 x8'; |
148 | |
149 | $af_unix = 1; |
150 | $af_inet = 2; |
151 | |
152 | $stream = 1; |
153 | $datagram = 2; |
154 | |
155 | ($name,$aliases,$proto) = getprotobyname('udp'); |
156 | $udp = $proto; |
157 | |
158 | ($name,$aliase,$port,$proto) = getservbyname('syslog','udp'); |
159 | $syslog = $port; |
160 | |
161 | if (chop($myname = `hostname`)) { |
162 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($myname); |
163 | croak "Can't lookup $myname" unless $name; |
164 | @bytes = unpack("C4",$addrs[0]); |
165 | } |
166 | else { |
167 | @bytes = (0,0,0,0); |
168 | } |
169 | $this = pack($pat, $af_inet, 0, @bytes); |
170 | |
171 | if ($host =~ /^\d+\./) { |
172 | @bytes = split(/\./,$host); |
173 | } |
174 | else { |
175 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($host); |
176 | croak "Can't lookup $host" unless $name; |
177 | @bytes = unpack("C4",$addrs[0]); |
178 | } |
179 | $that = pack($pat,$af_inet,$syslog,@bytes); |
180 | |
181 | socket(SYSLOG,$af_inet,$datagram,$udp) || croak "socket: $!"; |
182 | bind(SYSLOG,$this) || croak "bind: $!"; |
183 | connect(SYSLOG,$that) || croak "connect: $!"; |
184 | |
185 | local($old) = select(SYSLOG); $| = 1; select($old); |
186 | $connected = 1; |
187 | } |
188 | |
189 | sub disconnect { |
190 | close SYSLOG; |
191 | $connected = 0; |
192 | } |
193 | |
194 | 1; |
195 | |