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