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