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a0d0e21e |
1 | package Sys::Syslog; |
3b355090 |
2 | require 5.006; |
a0d0e21e |
3 | require Exporter; |
8ce86de8 |
4 | require DynaLoader; |
a0d0e21e |
5 | use Carp; |
108be7fb |
6 | use strict; |
a0d0e21e |
7 | |
108be7fb |
8 | our @ISA = qw(Exporter DynaLoader); |
9 | our @EXPORT = qw(openlog closelog setlogmask syslog); |
10 | our @EXPORT_OK = qw(setlogsock); |
11 | our $VERSION = '0.06'; |
a0d0e21e |
12 | |
23642f4b |
13 | # it would be nice to try stream/unix first, since that will be |
14 | # most efficient. However streams are dodgy - see _syslog_send_stream |
23642f4b |
15 | my @connectMethods = ( 'tcp', 'udp', 'unix', 'stream', 'console' ); |
dbfdd438 |
16 | if ($^O =~ /^(freebsd|linux)$/) { |
17 | @connectMethods = grep { $_ ne 'udp' } @connectMethods; |
18 | } |
23642f4b |
19 | my @defaultMethods = @connectMethods; |
20 | my $syslog_path = undef; |
21 | my $transmit_ok = 0; |
22 | my $current_proto = undef; |
23 | my $failed = undef; |
24 | my $fail_time = undef; |
108be7fb |
25 | our ($connected, @fallbackMethods, $syslog_send, $host); |
23642f4b |
26 | |
108be7fb |
27 | use Socket ':all'; |
55497cff |
28 | use Sys::Hostname; |
37120919 |
29 | |
5be1dfc7 |
30 | =head1 NAME |
31 | |
32 | Sys::Syslog, openlog, closelog, setlogmask, syslog - Perl interface to the UNIX syslog(3) calls |
33 | |
34 | =head1 SYNOPSIS |
35 | |
3ffabb8c |
36 | use Sys::Syslog; # all except setlogsock, or: |
37 | use Sys::Syslog qw(:DEFAULT setlogsock); # default set, plus setlogsock |
5be1dfc7 |
38 | |
3ffabb8c |
39 | setlogsock $sock_type; |
3d256c0f |
40 | openlog $ident, $logopt, $facility; # don't forget this |
2eae817d |
41 | syslog $priority, $format, @args; |
5be1dfc7 |
42 | $oldmask = setlogmask $mask_priority; |
43 | closelog; |
44 | |
45 | =head1 DESCRIPTION |
46 | |
47 | Sys::Syslog is an interface to the UNIX C<syslog(3)> program. |
48 | Call C<syslog()> with a string priority and a list of C<printf()> args |
49 | just like C<syslog(3)>. |
50 | |
51 | Syslog provides the functions: |
52 | |
bbc7dcd2 |
53 | =over 4 |
5be1dfc7 |
54 | |
55 | =item openlog $ident, $logopt, $facility |
56 | |
23642f4b |
57 | I<$ident> is prepended to every message. I<$logopt> contains zero or |
58 | more of the words I<pid>, I<ndelay>, I<nowait>. The cons option is |
59 | ignored, since the failover mechanism will drop down to the console |
60 | automatically if all other media fail. I<$facility> specifies the |
3d256c0f |
61 | part of the system to report about, for example LOG_USER or LOG_LOCAL0: |
62 | see your C<syslog(3)> documentation for the facilities available in |
63 | your system. |
64 | |
65 | B<You should use openlog() before calling syslog().> |
5be1dfc7 |
66 | |
2eae817d |
67 | =item syslog $priority, $format, @args |
5be1dfc7 |
68 | |
2eae817d |
69 | If I<$priority> permits, logs I<($format, @args)> |
5be1dfc7 |
70 | printed as by C<printf(3V)>, with the addition that I<%m> |
71 | is replaced with C<"$!"> (the latest error message). |
72 | |
3d256c0f |
73 | If you didn't use openlog() before using syslog(), syslog will try to |
74 | guess the I<$ident> by extracting the shortest prefix of I<$format> |
75 | that ends in a ":". |
76 | |
5be1dfc7 |
77 | =item setlogmask $mask_priority |
78 | |
79 | Sets log mask I<$mask_priority> and returns the old mask. |
80 | |
23642f4b |
81 | =item setlogsock $sock_type [$stream_location] (added in 5.004_02) |
3ffabb8c |
82 | |
cb63fe9d |
83 | Sets the socket type to be used for the next call to |
3ffabb8c |
84 | C<openlog()> or C<syslog()> and returns TRUE on success, |
85 | undef on failure. |
86 | |
f66a7beb |
87 | A value of 'unix' will connect to the UNIX domain socket (in some |
88 | systems a character special device) returned by the C<_PATH_LOG> macro |
89 | (if your system defines it), or F</dev/log> or F</dev/conslog>, |
90 | whatever is writable. A value of 'stream' will connect to the stream |
91 | indicated by the pathname provided as the optional second parameter. |
e9aaaa2f |
92 | (For example Solaris and IRIX require 'stream' instead of 'unix'.) |
f66a7beb |
93 | A value of 'inet' will connect to an INET socket (either tcp or udp, |
94 | tried in that order) returned by getservbyname(). 'tcp' and 'udp' can |
95 | also be given as values. The value 'console' will send messages |
96 | directly to the console, as for the 'cons' option in the logopts in |
97 | openlog(). |
23642f4b |
98 | |
99 | A reference to an array can also be passed as the first parameter. |
100 | When this calling method is used, the array should contain a list of |
101 | sock_types which are attempted in order. |
cb63fe9d |
102 | |
23642f4b |
103 | The default is to try tcp, udp, unix, stream, console. |
104 | |
105 | Giving an invalid value for sock_type will croak. |
cb63fe9d |
106 | |
5be1dfc7 |
107 | =item closelog |
108 | |
109 | Closes the log file. |
110 | |
111 | =back |
112 | |
113 | Note that C<openlog> now takes three arguments, just like C<openlog(3)>. |
114 | |
115 | =head1 EXAMPLES |
116 | |
117 | openlog($program, 'cons,pid', 'user'); |
e6c138cd |
118 | syslog('info', '%s', 'this is another test'); |
5be1dfc7 |
119 | syslog('mail|warning', 'this is a better test: %d', time); |
120 | closelog(); |
121 | |
122 | syslog('debug', 'this is the last test'); |
cb63fe9d |
123 | |
124 | setlogsock('unix'); |
5be1dfc7 |
125 | openlog("$program $$", 'ndelay', 'user'); |
126 | syslog('notice', 'fooprogram: this is really done'); |
127 | |
cb63fe9d |
128 | setlogsock('inet'); |
5be1dfc7 |
129 | $! = 55; |
130 | syslog('info', 'problem was %m'); # %m == $! in syslog(3) |
131 | |
476b65d9 |
132 | # Log to UDP port on $remotehost instead of logging locally |
133 | setlogsock('udp'); |
134 | $Sys::Syslog::host = $remotehost; |
135 | openlog($program, 'ndelay', 'user'); |
136 | syslog('info', 'something happened over here'); |
137 | |
5be1dfc7 |
138 | =head1 SEE ALSO |
139 | |
140 | L<syslog(3)> |
141 | |
142 | =head1 AUTHOR |
143 | |
150b260b |
144 | Tom Christiansen E<lt>F<tchrist@perl.com>E<gt> and Larry Wall |
145 | E<lt>F<larry@wall.org>E<gt>. |
146 | |
147 | UNIX domain sockets added by Sean Robinson |
23642f4b |
148 | E<lt>F<robinson_s@sc.maricopa.edu>E<gt> with support from Tim Bunce |
a88817a4 |
149 | E<lt>F<Tim.Bunce@ig.co.uk>E<gt> and the perl5-porters mailing list. |
150b260b |
150 | |
151 | Dependency on F<syslog.ph> replaced with XS code by Tom Hughes |
152 | E<lt>F<tom@compton.nu>E<gt>. |
5be1dfc7 |
153 | |
23642f4b |
154 | Code for constant()s regenerated by Nicholas Clark E<lt>F<nick@ccl4.org>E<gt>. |
155 | |
156 | Failover to different communication modes by Nick Williams |
157 | E<lt>F<Nick.Williams@morganstanley.com>E<gt>. |
b903fcff |
158 | |
5be1dfc7 |
159 | =cut |
a0d0e21e |
160 | |
8ce86de8 |
161 | sub AUTOLOAD { |
162 | # This AUTOLOAD is used to 'autoload' constants from the constant() |
163 | # XS function. |
23642f4b |
164 | |
8ce86de8 |
165 | my $constname; |
166 | our $AUTOLOAD; |
167 | ($constname = $AUTOLOAD) =~ s/.*:://; |
b903fcff |
168 | croak "&Sys::Syslog::constant not defined" if $constname eq 'constant'; |
169 | my ($error, $val) = constant($constname); |
170 | if ($error) { |
171 | croak $error; |
8ce86de8 |
172 | } |
108be7fb |
173 | no strict 'refs'; |
8ce86de8 |
174 | *$AUTOLOAD = sub { $val }; |
175 | goto &$AUTOLOAD; |
176 | } |
177 | |
178 | bootstrap Sys::Syslog $VERSION; |
a0d0e21e |
179 | |
108be7fb |
180 | our $maskpri = &LOG_UPTO(&LOG_DEBUG); |
a0d0e21e |
181 | |
182 | sub openlog { |
108be7fb |
183 | our ($ident, $logopt, $facility) = @_; # package vars |
184 | our $lo_pid = $logopt =~ /\bpid\b/; |
185 | our $lo_ndelay = $logopt =~ /\bndelay\b/; |
186 | our $lo_nowait = $logopt =~ /\bnowait\b/; |
a8710ca1 |
187 | return 1 unless $lo_ndelay; |
188 | &connect; |
a0d0e21e |
189 | } |
190 | |
191 | sub closelog { |
108be7fb |
192 | our $facility = our $ident = ''; |
a0d0e21e |
193 | &disconnect; |
194 | } |
195 | |
196 | sub setlogmask { |
108be7fb |
197 | my $oldmask = $maskpri; |
a0d0e21e |
198 | $maskpri = shift; |
199 | $oldmask; |
200 | } |
201 | |
cb63fe9d |
202 | sub setlogsock { |
108be7fb |
203 | my $setsock = shift; |
23642f4b |
204 | $syslog_path = shift; |
3ffabb8c |
205 | &disconnect if $connected; |
23642f4b |
206 | $transmit_ok = 0; |
207 | @fallbackMethods = (); |
208 | @connectMethods = @defaultMethods; |
209 | if (ref $setsock eq 'ARRAY') { |
210 | @connectMethods = @$setsock; |
211 | } elsif (lc($setsock) eq 'stream') { |
f66a7beb |
212 | unless (defined $syslog_path) { |
213 | my @try = qw(/dev/log /dev/conslog); |
e863979d |
214 | if (length &_PATH_LOG) { # Undefined _PATH_LOG is "". |
f66a7beb |
215 | unshift @try, &_PATH_LOG; |
216 | } |
217 | for my $try (@try) { |
218 | if (-w $try) { |
219 | $syslog_path = $try; |
220 | last; |
221 | } |
222 | } |
e863979d |
223 | carp "stream passed to setlogsock, but could not find any device" |
224 | unless defined $syslog_path; |
f66a7beb |
225 | } |
e863979d |
226 | unless (-w $syslog_path) { |
23642f4b |
227 | carp "stream passed to setlogsock, but $syslog_path is not writable"; |
228 | return undef; |
229 | } else { |
230 | @connectMethods = ( 'stream' ); |
231 | } |
232 | } elsif (lc($setsock) eq 'unix') { |
233 | if (length _PATH_LOG() && !defined $syslog_path) { |
234 | $syslog_path = _PATH_LOG(); |
235 | @connectMethods = ( 'unix' ); |
3ffabb8c |
236 | } else { |
23642f4b |
237 | carp 'unix passed to setlogsock, but path not available'; |
238 | return undef; |
3ffabb8c |
239 | } |
23642f4b |
240 | } elsif (lc($setsock) eq 'tcp') { |
241 | if (getservbyname('syslog', 'tcp') || getservbyname('syslogng', 'tcp')) { |
242 | @connectMethods = ( 'tcp' ); |
243 | } else { |
244 | carp "tcp passed to setlogsock, but tcp service unavailable"; |
245 | return undef; |
246 | } |
247 | } elsif (lc($setsock) eq 'udp') { |
248 | if (getservbyname('syslog', 'udp')) { |
249 | @connectMethods = ( 'udp' ); |
250 | } else { |
251 | carp "udp passed to setlogsock, but udp service unavailable"; |
252 | return undef; |
253 | } |
cb63fe9d |
254 | } elsif (lc($setsock) eq 'inet') { |
23642f4b |
255 | @connectMethods = ( 'tcp', 'udp' ); |
256 | } elsif (lc($setsock) eq 'console') { |
257 | @connectMethods = ( 'console' ); |
cb63fe9d |
258 | } else { |
23642f4b |
259 | carp "Invalid argument passed to setlogsock; must be 'stream', 'unix', 'tcp', 'udp' or 'inet'"; |
cb63fe9d |
260 | } |
f8b75b0c |
261 | return 1; |
cb63fe9d |
262 | } |
263 | |
a0d0e21e |
264 | sub syslog { |
108be7fb |
265 | my $priority = shift; |
266 | my $mask = shift; |
267 | my ($message, $whoami); |
268 | my (@words, $num, $numpri, $numfac, $sum); |
269 | our $facility; |
a0d0e21e |
270 | local($facility) = $facility; # may need to change temporarily. |
271 | |
78ac6fa8 |
272 | croak "syslog: expecting argument \$priority" unless $priority; |
273 | croak "syslog: expecting argument \$format" unless $mask; |
a0d0e21e |
274 | |
275 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility". |
276 | undef $numpri; |
277 | undef $numfac; |
278 | foreach (@words) { |
279 | $num = &xlate($_); # Translate word to number. |
280 | if (/^kern$/ || $num < 0) { |
281 | croak "syslog: invalid level/facility: $_"; |
282 | } |
283 | elsif ($num <= &LOG_PRIMASK) { |
284 | croak "syslog: too many levels given: $_" if defined($numpri); |
285 | $numpri = $num; |
286 | return 0 unless &LOG_MASK($numpri) & $maskpri; |
287 | } |
288 | else { |
289 | croak "syslog: too many facilities given: $_" if defined($numfac); |
290 | $facility = $_; |
291 | $numfac = $num; |
292 | } |
293 | } |
294 | |
295 | croak "syslog: level must be given" unless defined($numpri); |
296 | |
297 | if (!defined($numfac)) { # Facility not specified in this call. |
298 | $facility = 'user' unless $facility; |
299 | $numfac = &xlate($facility); |
300 | } |
301 | |
302 | &connect unless $connected; |
303 | |
108be7fb |
304 | $whoami = our $ident; |
a0d0e21e |
305 | |
5dad0344 |
306 | if (!$whoami && $mask =~ /^(\S.*?):\s?(.*)/) { |
a0d0e21e |
307 | $whoami = $1; |
308 | $mask = $2; |
309 | } |
310 | |
311 | unless ($whoami) { |
312 | ($whoami = getlogin) || |
313 | ($whoami = getpwuid($<)) || |
314 | ($whoami = 'syslog'); |
315 | } |
316 | |
108be7fb |
317 | $whoami .= "[$$]" if our $lo_pid; |
a0d0e21e |
318 | |
3b355090 |
319 | $mask =~ s/(?<!%)%m/$!/g; |
a0d0e21e |
320 | $mask .= "\n" unless $mask =~ /\n$/; |
321 | $message = sprintf ($mask, @_); |
322 | |
323 | $sum = $numpri + $numfac; |
23642f4b |
324 | my $buf = "<$sum>$whoami: $message\0"; |
325 | |
326 | # it's possible that we'll get an error from sending |
327 | # (e.g. if method is UDP and there is no UDP listener, |
328 | # then we'll get ECONNREFUSED on the send). So what we |
329 | # want to do at this point is to fallback onto a different |
330 | # connection method. |
331 | while (scalar @fallbackMethods || $syslog_send) { |
332 | if ($failed && (time - $fail_time) > 60) { |
333 | # it's been a while... maybe things have been fixed |
334 | @fallbackMethods = (); |
335 | disconnect(); |
336 | $transmit_ok = 0; # make it look like a fresh attempt |
337 | &connect; |
338 | } |
339 | if ($connected && !connection_ok()) { |
340 | # Something was OK, but has now broken. Remember coz we'll |
341 | # want to go back to what used to be OK. |
342 | $failed = $current_proto unless $failed; |
343 | $fail_time = time; |
344 | disconnect(); |
345 | } |
346 | &connect unless $connected; |
60b8437d |
347 | $failed = undef if ($current_proto && $failed && $current_proto eq $failed); |
23642f4b |
348 | if ($syslog_send) { |
349 | if (&{$syslog_send}($buf)) { |
350 | $transmit_ok++; |
351 | return 1; |
a0d0e21e |
352 | } |
23642f4b |
353 | # typically doesn't happen, since errors are rare from write(). |
354 | disconnect(); |
355 | } |
356 | } |
357 | # could not send, could not fallback onto a working |
358 | # connection method. Lose. |
359 | return 0; |
360 | } |
361 | |
362 | sub _syslog_send_console { |
363 | my ($buf) = @_; |
364 | chop($buf); # delete the NUL from the end |
365 | # The console print is a method which could block |
366 | # so we do it in a child process and always return success |
367 | # to the caller. |
368 | if (my $pid = fork) { |
108be7fb |
369 | our $lo_nowait; |
23642f4b |
370 | if ($lo_nowait) { |
371 | return 1; |
372 | } else { |
373 | if (waitpid($pid, 0) >= 0) { |
374 | return ($? >> 8); |
375 | } else { |
376 | # it's possible that the caller has other |
377 | # plans for SIGCHLD, so let's not interfere |
378 | return 1; |
a0d0e21e |
379 | } |
380 | } |
23642f4b |
381 | } else { |
382 | if (open(CONS, ">/dev/console")) { |
383 | my $ret = print CONS $buf . "\r"; |
384 | exit ($ret) if defined $pid; |
385 | close CONS; |
386 | } |
387 | exit if defined $pid; |
a0d0e21e |
388 | } |
389 | } |
390 | |
23642f4b |
391 | sub _syslog_send_stream { |
392 | my ($buf) = @_; |
393 | # XXX: this only works if the OS stream implementation makes a write |
394 | # look like a putmsg() with simple header. For instance it works on |
395 | # Solaris 8 but not Solaris 7. |
396 | # To be correct, it should use a STREAMS API, but perl doesn't have one. |
397 | return syswrite(SYSLOG, $buf, length($buf)); |
398 | } |
399 | sub _syslog_send_socket { |
400 | my ($buf) = @_; |
401 | return syswrite(SYSLOG, $buf, length($buf)); |
402 | #return send(SYSLOG, $buf, 0); |
403 | } |
404 | |
a0d0e21e |
405 | sub xlate { |
108be7fb |
406 | my($name) = @_; |
b9f13614 |
407 | return $name+0 if $name =~ /^\s*\d+\s*$/; |
55497cff |
408 | $name = uc $name; |
a0d0e21e |
409 | $name = "LOG_$name" unless $name =~ /^LOG_/; |
748a9306 |
410 | $name = "Sys::Syslog::$name"; |
2c3b42a1 |
411 | # Can't have just eval { &$name } || -1 because some LOG_XXX may be zero. |
108be7fb |
412 | my $value = eval { no strict 'refs'; &$name }; |
2c3b42a1 |
413 | defined $value ? $value : -1; |
a0d0e21e |
414 | } |
415 | |
416 | sub connect { |
23642f4b |
417 | @fallbackMethods = @connectMethods unless (scalar @fallbackMethods); |
418 | if ($transmit_ok && $current_proto) { |
419 | # Retry what we were on, because it's worked in the past. |
420 | unshift(@fallbackMethods, $current_proto); |
421 | } |
422 | $connected = 0; |
423 | my @errs = (); |
424 | my $proto = undef; |
425 | while ($proto = shift(@fallbackMethods)) { |
108be7fb |
426 | no strict 'refs'; |
23642f4b |
427 | my $fn = "connect_$proto"; |
108be7fb |
428 | $connected = &$fn(\@errs) if defined &$fn; |
23642f4b |
429 | last if ($connected); |
430 | } |
431 | |
432 | $transmit_ok = 0; |
433 | if ($connected) { |
60b8437d |
434 | $current_proto = $proto; |
108be7fb |
435 | my($old) = select(SYSLOG); $| = 1; select($old); |
23642f4b |
436 | } else { |
437 | @fallbackMethods = (); |
438 | foreach my $err (@errs) { |
439 | carp $err; |
440 | } |
441 | croak "no connection to syslog available"; |
442 | } |
443 | } |
444 | |
445 | sub connect_tcp { |
446 | my ($errs) = @_; |
447 | unless ($host) { |
448 | require Sys::Hostname; |
449 | my($host_uniq) = Sys::Hostname::hostname(); |
450 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
451 | } |
452 | my $tcp = getprotobyname('tcp'); |
453 | if (!defined $tcp) { |
454 | push(@{$errs}, "getprotobyname failed for tcp"); |
455 | return 0; |
456 | } |
457 | my $syslog = getservbyname('syslog','tcp'); |
458 | $syslog = getservbyname('syslogng','tcp') unless (defined $syslog); |
459 | if (!defined $syslog) { |
460 | push(@{$errs}, "getservbyname failed for tcp"); |
461 | return 0; |
462 | } |
463 | |
464 | my $this = sockaddr_in($syslog, INADDR_ANY); |
465 | my $that = sockaddr_in($syslog, inet_aton($host)); |
466 | if (!$that) { |
467 | push(@{$errs}, "can't lookup $host"); |
468 | return 0; |
469 | } |
470 | if (!socket(SYSLOG,AF_INET,SOCK_STREAM,$tcp)) { |
471 | push(@{$errs}, "tcp socket: $!"); |
472 | return 0; |
473 | } |
474 | setsockopt(SYSLOG, SOL_SOCKET, SO_KEEPALIVE, 1); |
475 | setsockopt(SYSLOG, IPPROTO_TCP, TCP_NODELAY, 1); |
60b8437d |
476 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
477 | push(@{$errs}, "tcp connect: $!"); |
478 | return 0; |
479 | } |
480 | $syslog_send = \&_syslog_send_socket; |
481 | return 1; |
482 | } |
483 | |
484 | sub connect_udp { |
485 | my ($errs) = @_; |
4fc7577b |
486 | unless ($host) { |
487 | require Sys::Hostname; |
2eae817d |
488 | my($host_uniq) = Sys::Hostname::hostname(); |
3e3baf6d |
489 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
4fc7577b |
490 | } |
23642f4b |
491 | my $udp = getprotobyname('udp'); |
492 | if (!defined $udp) { |
493 | push(@{$errs}, "getprotobyname failed for udp"); |
494 | return 0; |
495 | } |
496 | my $syslog = getservbyname('syslog','udp'); |
497 | if (!defined $syslog) { |
498 | push(@{$errs}, "getservbyname failed for udp"); |
499 | return 0; |
500 | } |
501 | my $this = sockaddr_in($syslog, INADDR_ANY); |
502 | my $that = sockaddr_in($syslog, inet_aton($host)); |
503 | if (!$that) { |
504 | push(@{$errs}, "can't lookup $host"); |
505 | return 0; |
506 | } |
507 | if (!socket(SYSLOG,AF_INET,SOCK_DGRAM,$udp)) { |
508 | push(@{$errs}, "udp socket: $!"); |
509 | return 0; |
510 | } |
60b8437d |
511 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
512 | push(@{$errs}, "udp connect: $!"); |
513 | return 0; |
514 | } |
515 | # We want to check that the UDP connect worked. However the only |
516 | # way to do that is to send a message and see if an ICMP is returned |
517 | _syslog_send_socket(""); |
518 | if (!connection_ok()) { |
519 | push(@{$errs}, "udp connect: nobody listening"); |
520 | return 0; |
521 | } |
522 | $syslog_send = \&_syslog_send_socket; |
523 | return 1; |
524 | } |
525 | |
526 | sub connect_stream { |
527 | my ($errs) = @_; |
528 | # might want syslog_path to be variable based on syslog.h (if only |
529 | # it were in there!) |
530 | $syslog_path = '/dev/conslog'; |
531 | if (!-w $syslog_path) { |
532 | push(@{$errs}, "stream $syslog_path is not writable"); |
533 | return 0; |
534 | } |
535 | if (!open(SYSLOG, ">" . $syslog_path)) { |
536 | push(@{$errs}, "stream can't open $syslog_path: $!"); |
537 | return 0; |
538 | } |
539 | $syslog_send = \&_syslog_send_stream; |
540 | return 1; |
541 | } |
542 | |
543 | sub connect_unix { |
544 | my ($errs) = @_; |
545 | if (length _PATH_LOG()) { |
546 | $syslog_path = _PATH_LOG(); |
cb63fe9d |
547 | } else { |
23642f4b |
548 | push(@{$errs}, "_PATH_LOG not available in syslog.h"); |
549 | return 0; |
550 | } |
551 | my $that = sockaddr_un($syslog_path); |
552 | if (!$that) { |
553 | push(@{$errs}, "can't locate $syslog_path"); |
554 | return 0; |
555 | } |
556 | if (!socket(SYSLOG,AF_UNIX,SOCK_STREAM,0)) { |
557 | push(@{$errs}, "unix stream socket: $!"); |
558 | return 0; |
559 | } |
60b8437d |
560 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
561 | if (!socket(SYSLOG,AF_UNIX,SOCK_DGRAM,0)) { |
562 | push(@{$errs}, "unix dgram socket: $!"); |
563 | return 0; |
564 | } |
60b8437d |
565 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
566 | push(@{$errs}, "unix dgram connect: $!"); |
567 | return 0; |
568 | } |
cb63fe9d |
569 | } |
23642f4b |
570 | $syslog_send = \&_syslog_send_socket; |
571 | return 1; |
572 | } |
573 | |
574 | sub connect_console { |
575 | my ($errs) = @_; |
576 | if (!-w '/dev/console') { |
577 | push(@{$errs}, "console is not writable"); |
578 | return 0; |
579 | } |
580 | $syslog_send = \&_syslog_send_console; |
581 | return 1; |
582 | } |
583 | |
584 | # to test if the connection is still good, we need to check if any |
585 | # errors are present on the connection. The errors will not be raised |
586 | # by a write. Instead, sockets are made readable and the next read |
587 | # would cause the error to be returned. Unfortunately the syslog |
588 | # 'protocol' never provides anything for us to read. But with |
589 | # judicious use of select(), we can see if it would be readable... |
590 | sub connection_ok { |
dbfdd438 |
591 | return 1 if (defined $current_proto && $current_proto eq 'console'); |
23642f4b |
592 | my $rin = ''; |
593 | vec($rin, fileno(SYSLOG), 1) = 1; |
594 | my $ret = select $rin, undef, $rin, 0; |
595 | return ($ret ? 0 : 1); |
a0d0e21e |
596 | } |
597 | |
598 | sub disconnect { |
599 | close SYSLOG; |
600 | $connected = 0; |
23642f4b |
601 | $syslog_send = undef; |
a0d0e21e |
602 | } |
603 | |
604 | 1; |