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a0d0e21e |
1 | package Sys::Syslog; |
2 | require 5.000; |
3 | require Exporter; |
8ce86de8 |
4 | require DynaLoader; |
a0d0e21e |
5 | use Carp; |
6 | |
8ce86de8 |
7 | @ISA = qw(Exporter DynaLoader); |
a0d0e21e |
8 | @EXPORT = qw(openlog closelog setlogmask syslog); |
3ffabb8c |
9 | @EXPORT_OK = qw(setlogsock); |
4522225b |
10 | $VERSION = '0.04'; |
a0d0e21e |
11 | |
23642f4b |
12 | # it would be nice to try stream/unix first, since that will be |
13 | # most efficient. However streams are dodgy - see _syslog_send_stream |
14 | #my @connectMethods = ( 'stream', 'unix', 'tcp', 'udp' ); |
15 | my @connectMethods = ( 'tcp', 'udp', 'unix', 'stream', 'console' ); |
dbfdd438 |
16 | if ($^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; |
25 | |
37120919 |
26 | use Socket; |
55497cff |
27 | use Sys::Hostname; |
37120919 |
28 | |
5be1dfc7 |
29 | =head1 NAME |
30 | |
31 | Sys::Syslog, openlog, closelog, setlogmask, syslog - Perl interface to the UNIX syslog(3) calls |
32 | |
33 | =head1 SYNOPSIS |
34 | |
3ffabb8c |
35 | use Sys::Syslog; # all except setlogsock, or: |
36 | use Sys::Syslog qw(:DEFAULT setlogsock); # default set, plus setlogsock |
5be1dfc7 |
37 | |
3ffabb8c |
38 | setlogsock $sock_type; |
3d256c0f |
39 | openlog $ident, $logopt, $facility; # don't forget this |
2eae817d |
40 | syslog $priority, $format, @args; |
5be1dfc7 |
41 | $oldmask = setlogmask $mask_priority; |
42 | closelog; |
43 | |
44 | =head1 DESCRIPTION |
45 | |
46 | Sys::Syslog is an interface to the UNIX C<syslog(3)> program. |
47 | Call C<syslog()> with a string priority and a list of C<printf()> args |
48 | just like C<syslog(3)>. |
49 | |
50 | Syslog provides the functions: |
51 | |
bbc7dcd2 |
52 | =over 4 |
5be1dfc7 |
53 | |
54 | =item openlog $ident, $logopt, $facility |
55 | |
23642f4b |
56 | I<$ident> is prepended to every message. I<$logopt> contains zero or |
57 | more of the words I<pid>, I<ndelay>, I<nowait>. The cons option is |
58 | ignored, since the failover mechanism will drop down to the console |
59 | automatically if all other media fail. I<$facility> specifies the |
3d256c0f |
60 | part of the system to report about, for example LOG_USER or LOG_LOCAL0: |
61 | see your C<syslog(3)> documentation for the facilities available in |
62 | your system. |
63 | |
64 | B<You should use openlog() before calling syslog().> |
5be1dfc7 |
65 | |
2eae817d |
66 | =item syslog $priority, $format, @args |
5be1dfc7 |
67 | |
2eae817d |
68 | If I<$priority> permits, logs I<($format, @args)> |
5be1dfc7 |
69 | printed as by C<printf(3V)>, with the addition that I<%m> |
70 | is replaced with C<"$!"> (the latest error message). |
71 | |
3d256c0f |
72 | If you didn't use openlog() before using syslog(), syslog will try to |
73 | guess the I<$ident> by extracting the shortest prefix of I<$format> |
74 | that ends in a ":". |
75 | |
5be1dfc7 |
76 | =item setlogmask $mask_priority |
77 | |
78 | Sets log mask I<$mask_priority> and returns the old mask. |
79 | |
23642f4b |
80 | =item setlogsock $sock_type [$stream_location] (added in 5.004_02) |
3ffabb8c |
81 | |
cb63fe9d |
82 | Sets the socket type to be used for the next call to |
3ffabb8c |
83 | C<openlog()> or C<syslog()> and returns TRUE on success, |
84 | undef on failure. |
85 | |
f66a7beb |
86 | A value of 'unix' will connect to the UNIX domain socket (in some |
87 | systems a character special device) returned by the C<_PATH_LOG> macro |
88 | (if your system defines it), or F</dev/log> or F</dev/conslog>, |
89 | whatever is writable. A value of 'stream' will connect to the stream |
90 | indicated by the pathname provided as the optional second parameter. |
91 | A value of 'inet' will connect to an INET socket (either tcp or udp, |
92 | tried in that order) returned by getservbyname(). 'tcp' and 'udp' can |
93 | also be given as values. The value 'console' will send messages |
94 | directly to the console, as for the 'cons' option in the logopts in |
95 | openlog(). |
23642f4b |
96 | |
97 | A reference to an array can also be passed as the first parameter. |
98 | When this calling method is used, the array should contain a list of |
99 | sock_types which are attempted in order. |
cb63fe9d |
100 | |
23642f4b |
101 | The default is to try tcp, udp, unix, stream, console. |
102 | |
103 | Giving an invalid value for sock_type will croak. |
cb63fe9d |
104 | |
5be1dfc7 |
105 | =item closelog |
106 | |
107 | Closes the log file. |
108 | |
109 | =back |
110 | |
111 | Note that C<openlog> now takes three arguments, just like C<openlog(3)>. |
112 | |
113 | =head1 EXAMPLES |
114 | |
115 | openlog($program, 'cons,pid', 'user'); |
116 | syslog('info', 'this is another test'); |
117 | syslog('mail|warning', 'this is a better test: %d', time); |
118 | closelog(); |
119 | |
120 | syslog('debug', 'this is the last test'); |
cb63fe9d |
121 | |
122 | setlogsock('unix'); |
5be1dfc7 |
123 | openlog("$program $$", 'ndelay', 'user'); |
124 | syslog('notice', 'fooprogram: this is really done'); |
125 | |
cb63fe9d |
126 | setlogsock('inet'); |
5be1dfc7 |
127 | $! = 55; |
128 | syslog('info', 'problem was %m'); # %m == $! in syslog(3) |
129 | |
5be1dfc7 |
130 | =head1 SEE ALSO |
131 | |
132 | L<syslog(3)> |
133 | |
134 | =head1 AUTHOR |
135 | |
150b260b |
136 | Tom Christiansen E<lt>F<tchrist@perl.com>E<gt> and Larry Wall |
137 | E<lt>F<larry@wall.org>E<gt>. |
138 | |
139 | UNIX domain sockets added by Sean Robinson |
23642f4b |
140 | E<lt>F<robinson_s@sc.maricopa.edu>E<gt> with support from Tim Bunce |
a88817a4 |
141 | E<lt>F<Tim.Bunce@ig.co.uk>E<gt> and the perl5-porters mailing list. |
150b260b |
142 | |
143 | Dependency on F<syslog.ph> replaced with XS code by Tom Hughes |
144 | E<lt>F<tom@compton.nu>E<gt>. |
5be1dfc7 |
145 | |
23642f4b |
146 | Code for constant()s regenerated by Nicholas Clark E<lt>F<nick@ccl4.org>E<gt>. |
147 | |
148 | Failover to different communication modes by Nick Williams |
149 | E<lt>F<Nick.Williams@morganstanley.com>E<gt>. |
b903fcff |
150 | |
5be1dfc7 |
151 | =cut |
a0d0e21e |
152 | |
8ce86de8 |
153 | sub AUTOLOAD { |
154 | # This AUTOLOAD is used to 'autoload' constants from the constant() |
155 | # XS function. |
23642f4b |
156 | |
8ce86de8 |
157 | my $constname; |
158 | our $AUTOLOAD; |
159 | ($constname = $AUTOLOAD) =~ s/.*:://; |
b903fcff |
160 | croak "&Sys::Syslog::constant not defined" if $constname eq 'constant'; |
161 | my ($error, $val) = constant($constname); |
162 | if ($error) { |
163 | croak $error; |
8ce86de8 |
164 | } |
165 | *$AUTOLOAD = sub { $val }; |
166 | goto &$AUTOLOAD; |
167 | } |
168 | |
169 | bootstrap Sys::Syslog $VERSION; |
a0d0e21e |
170 | |
171 | $maskpri = &LOG_UPTO(&LOG_DEBUG); |
172 | |
173 | sub openlog { |
174 | ($ident, $logopt, $facility) = @_; # package vars |
175 | $lo_pid = $logopt =~ /\bpid\b/; |
176 | $lo_ndelay = $logopt =~ /\bndelay\b/; |
a0d0e21e |
177 | $lo_nowait = $logopt =~ /\bnowait\b/; |
a8710ca1 |
178 | return 1 unless $lo_ndelay; |
179 | &connect; |
a0d0e21e |
180 | } |
181 | |
182 | sub closelog { |
183 | $facility = $ident = ''; |
184 | &disconnect; |
185 | } |
186 | |
187 | sub setlogmask { |
188 | local($oldmask) = $maskpri; |
189 | $maskpri = shift; |
190 | $oldmask; |
191 | } |
192 | |
cb63fe9d |
193 | sub setlogsock { |
194 | local($setsock) = shift; |
23642f4b |
195 | $syslog_path = shift; |
3ffabb8c |
196 | &disconnect if $connected; |
23642f4b |
197 | $transmit_ok = 0; |
198 | @fallbackMethods = (); |
199 | @connectMethods = @defaultMethods; |
200 | if (ref $setsock eq 'ARRAY') { |
201 | @connectMethods = @$setsock; |
202 | } elsif (lc($setsock) eq 'stream') { |
f66a7beb |
203 | unless (defined $syslog_path) { |
204 | my @try = qw(/dev/log /dev/conslog); |
e863979d |
205 | if (length &_PATH_LOG) { # Undefined _PATH_LOG is "". |
f66a7beb |
206 | unshift @try, &_PATH_LOG; |
207 | } |
208 | for my $try (@try) { |
209 | if (-w $try) { |
210 | $syslog_path = $try; |
211 | last; |
212 | } |
213 | } |
e863979d |
214 | carp "stream passed to setlogsock, but could not find any device" |
215 | unless defined $syslog_path; |
f66a7beb |
216 | } |
e863979d |
217 | unless (-w $syslog_path) { |
23642f4b |
218 | carp "stream passed to setlogsock, but $syslog_path is not writable"; |
219 | return undef; |
220 | } else { |
221 | @connectMethods = ( 'stream' ); |
222 | } |
223 | } elsif (lc($setsock) eq 'unix') { |
224 | if (length _PATH_LOG() && !defined $syslog_path) { |
225 | $syslog_path = _PATH_LOG(); |
226 | @connectMethods = ( 'unix' ); |
3ffabb8c |
227 | } else { |
23642f4b |
228 | carp 'unix passed to setlogsock, but path not available'; |
229 | return undef; |
3ffabb8c |
230 | } |
23642f4b |
231 | } elsif (lc($setsock) eq 'tcp') { |
232 | if (getservbyname('syslog', 'tcp') || getservbyname('syslogng', 'tcp')) { |
233 | @connectMethods = ( 'tcp' ); |
234 | } else { |
235 | carp "tcp passed to setlogsock, but tcp service unavailable"; |
236 | return undef; |
237 | } |
238 | } elsif (lc($setsock) eq 'udp') { |
239 | if (getservbyname('syslog', 'udp')) { |
240 | @connectMethods = ( 'udp' ); |
241 | } else { |
242 | carp "udp passed to setlogsock, but udp service unavailable"; |
243 | return undef; |
244 | } |
cb63fe9d |
245 | } elsif (lc($setsock) eq 'inet') { |
23642f4b |
246 | @connectMethods = ( 'tcp', 'udp' ); |
247 | } elsif (lc($setsock) eq 'console') { |
248 | @connectMethods = ( 'console' ); |
cb63fe9d |
249 | } else { |
23642f4b |
250 | carp "Invalid argument passed to setlogsock; must be 'stream', 'unix', 'tcp', 'udp' or 'inet'"; |
cb63fe9d |
251 | } |
f8b75b0c |
252 | return 1; |
cb63fe9d |
253 | } |
254 | |
a0d0e21e |
255 | sub syslog { |
256 | local($priority) = shift; |
257 | local($mask) = shift; |
258 | local($message, $whoami); |
259 | local(@words, $num, $numpri, $numfac, $sum); |
260 | local($facility) = $facility; # may need to change temporarily. |
261 | |
78ac6fa8 |
262 | croak "syslog: expecting argument \$priority" unless $priority; |
263 | croak "syslog: expecting argument \$format" unless $mask; |
a0d0e21e |
264 | |
265 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility". |
266 | undef $numpri; |
267 | undef $numfac; |
268 | foreach (@words) { |
269 | $num = &xlate($_); # Translate word to number. |
270 | if (/^kern$/ || $num < 0) { |
271 | croak "syslog: invalid level/facility: $_"; |
272 | } |
273 | elsif ($num <= &LOG_PRIMASK) { |
274 | croak "syslog: too many levels given: $_" if defined($numpri); |
275 | $numpri = $num; |
276 | return 0 unless &LOG_MASK($numpri) & $maskpri; |
277 | } |
278 | else { |
279 | croak "syslog: too many facilities given: $_" if defined($numfac); |
280 | $facility = $_; |
281 | $numfac = $num; |
282 | } |
283 | } |
284 | |
285 | croak "syslog: level must be given" unless defined($numpri); |
286 | |
287 | if (!defined($numfac)) { # Facility not specified in this call. |
288 | $facility = 'user' unless $facility; |
289 | $numfac = &xlate($facility); |
290 | } |
291 | |
292 | &connect unless $connected; |
293 | |
294 | $whoami = $ident; |
295 | |
5dad0344 |
296 | if (!$whoami && $mask =~ /^(\S.*?):\s?(.*)/) { |
a0d0e21e |
297 | $whoami = $1; |
298 | $mask = $2; |
299 | } |
300 | |
301 | unless ($whoami) { |
302 | ($whoami = getlogin) || |
303 | ($whoami = getpwuid($<)) || |
304 | ($whoami = 'syslog'); |
305 | } |
306 | |
307 | $whoami .= "[$$]" if $lo_pid; |
308 | |
309 | $mask =~ s/%m/$!/g; |
310 | $mask .= "\n" unless $mask =~ /\n$/; |
311 | $message = sprintf ($mask, @_); |
312 | |
313 | $sum = $numpri + $numfac; |
23642f4b |
314 | my $buf = "<$sum>$whoami: $message\0"; |
315 | |
316 | # it's possible that we'll get an error from sending |
317 | # (e.g. if method is UDP and there is no UDP listener, |
318 | # then we'll get ECONNREFUSED on the send). So what we |
319 | # want to do at this point is to fallback onto a different |
320 | # connection method. |
321 | while (scalar @fallbackMethods || $syslog_send) { |
322 | if ($failed && (time - $fail_time) > 60) { |
323 | # it's been a while... maybe things have been fixed |
324 | @fallbackMethods = (); |
325 | disconnect(); |
326 | $transmit_ok = 0; # make it look like a fresh attempt |
327 | &connect; |
328 | } |
329 | if ($connected && !connection_ok()) { |
330 | # Something was OK, but has now broken. Remember coz we'll |
331 | # want to go back to what used to be OK. |
332 | $failed = $current_proto unless $failed; |
333 | $fail_time = time; |
334 | disconnect(); |
335 | } |
336 | &connect unless $connected; |
60b8437d |
337 | $failed = undef if ($current_proto && $failed && $current_proto eq $failed); |
23642f4b |
338 | if ($syslog_send) { |
339 | if (&{$syslog_send}($buf)) { |
340 | $transmit_ok++; |
341 | return 1; |
a0d0e21e |
342 | } |
23642f4b |
343 | # typically doesn't happen, since errors are rare from write(). |
344 | disconnect(); |
345 | } |
346 | } |
347 | # could not send, could not fallback onto a working |
348 | # connection method. Lose. |
349 | return 0; |
350 | } |
351 | |
352 | sub _syslog_send_console { |
353 | my ($buf) = @_; |
354 | chop($buf); # delete the NUL from the end |
355 | # The console print is a method which could block |
356 | # so we do it in a child process and always return success |
357 | # to the caller. |
358 | if (my $pid = fork) { |
359 | if ($lo_nowait) { |
360 | return 1; |
361 | } else { |
362 | if (waitpid($pid, 0) >= 0) { |
363 | return ($? >> 8); |
364 | } else { |
365 | # it's possible that the caller has other |
366 | # plans for SIGCHLD, so let's not interfere |
367 | return 1; |
a0d0e21e |
368 | } |
369 | } |
23642f4b |
370 | } else { |
371 | if (open(CONS, ">/dev/console")) { |
372 | my $ret = print CONS $buf . "\r"; |
373 | exit ($ret) if defined $pid; |
374 | close CONS; |
375 | } |
376 | exit if defined $pid; |
a0d0e21e |
377 | } |
378 | } |
379 | |
23642f4b |
380 | sub _syslog_send_stream { |
381 | my ($buf) = @_; |
382 | # XXX: this only works if the OS stream implementation makes a write |
383 | # look like a putmsg() with simple header. For instance it works on |
384 | # Solaris 8 but not Solaris 7. |
385 | # To be correct, it should use a STREAMS API, but perl doesn't have one. |
386 | return syswrite(SYSLOG, $buf, length($buf)); |
387 | } |
388 | sub _syslog_send_socket { |
389 | my ($buf) = @_; |
390 | return syswrite(SYSLOG, $buf, length($buf)); |
391 | #return send(SYSLOG, $buf, 0); |
392 | } |
393 | |
a0d0e21e |
394 | sub xlate { |
395 | local($name) = @_; |
55497cff |
396 | $name = uc $name; |
a0d0e21e |
397 | $name = "LOG_$name" unless $name =~ /^LOG_/; |
748a9306 |
398 | $name = "Sys::Syslog::$name"; |
2c3b42a1 |
399 | # Can't have just eval { &$name } || -1 because some LOG_XXX may be zero. |
400 | my $value = eval { &$name }; |
401 | defined $value ? $value : -1; |
a0d0e21e |
402 | } |
403 | |
404 | sub connect { |
23642f4b |
405 | @fallbackMethods = @connectMethods unless (scalar @fallbackMethods); |
406 | if ($transmit_ok && $current_proto) { |
407 | # Retry what we were on, because it's worked in the past. |
408 | unshift(@fallbackMethods, $current_proto); |
409 | } |
410 | $connected = 0; |
411 | my @errs = (); |
412 | my $proto = undef; |
413 | while ($proto = shift(@fallbackMethods)) { |
414 | my $fn = "connect_$proto"; |
415 | $connected = &$fn(\@errs) unless (!defined &$fn); |
416 | last if ($connected); |
417 | } |
418 | |
419 | $transmit_ok = 0; |
420 | if ($connected) { |
60b8437d |
421 | $current_proto = $proto; |
23642f4b |
422 | local($old) = select(SYSLOG); $| = 1; select($old); |
423 | } else { |
424 | @fallbackMethods = (); |
425 | foreach my $err (@errs) { |
426 | carp $err; |
427 | } |
428 | croak "no connection to syslog available"; |
429 | } |
430 | } |
431 | |
432 | sub connect_tcp { |
433 | my ($errs) = @_; |
434 | unless ($host) { |
435 | require Sys::Hostname; |
436 | my($host_uniq) = Sys::Hostname::hostname(); |
437 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
438 | } |
439 | my $tcp = getprotobyname('tcp'); |
440 | if (!defined $tcp) { |
441 | push(@{$errs}, "getprotobyname failed for tcp"); |
442 | return 0; |
443 | } |
444 | my $syslog = getservbyname('syslog','tcp'); |
445 | $syslog = getservbyname('syslogng','tcp') unless (defined $syslog); |
446 | if (!defined $syslog) { |
447 | push(@{$errs}, "getservbyname failed for tcp"); |
448 | return 0; |
449 | } |
450 | |
451 | my $this = sockaddr_in($syslog, INADDR_ANY); |
452 | my $that = sockaddr_in($syslog, inet_aton($host)); |
453 | if (!$that) { |
454 | push(@{$errs}, "can't lookup $host"); |
455 | return 0; |
456 | } |
457 | if (!socket(SYSLOG,AF_INET,SOCK_STREAM,$tcp)) { |
458 | push(@{$errs}, "tcp socket: $!"); |
459 | return 0; |
460 | } |
461 | setsockopt(SYSLOG, SOL_SOCKET, SO_KEEPALIVE, 1); |
462 | setsockopt(SYSLOG, IPPROTO_TCP, TCP_NODELAY, 1); |
60b8437d |
463 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
464 | push(@{$errs}, "tcp connect: $!"); |
465 | return 0; |
466 | } |
467 | $syslog_send = \&_syslog_send_socket; |
468 | return 1; |
469 | } |
470 | |
471 | sub connect_udp { |
472 | my ($errs) = @_; |
4fc7577b |
473 | unless ($host) { |
474 | require Sys::Hostname; |
2eae817d |
475 | my($host_uniq) = Sys::Hostname::hostname(); |
3e3baf6d |
476 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
4fc7577b |
477 | } |
23642f4b |
478 | my $udp = getprotobyname('udp'); |
479 | if (!defined $udp) { |
480 | push(@{$errs}, "getprotobyname failed for udp"); |
481 | return 0; |
482 | } |
483 | my $syslog = getservbyname('syslog','udp'); |
484 | if (!defined $syslog) { |
485 | push(@{$errs}, "getservbyname failed for udp"); |
486 | return 0; |
487 | } |
488 | my $this = sockaddr_in($syslog, INADDR_ANY); |
489 | my $that = sockaddr_in($syslog, inet_aton($host)); |
490 | if (!$that) { |
491 | push(@{$errs}, "can't lookup $host"); |
492 | return 0; |
493 | } |
494 | if (!socket(SYSLOG,AF_INET,SOCK_DGRAM,$udp)) { |
495 | push(@{$errs}, "udp socket: $!"); |
496 | return 0; |
497 | } |
60b8437d |
498 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
499 | push(@{$errs}, "udp connect: $!"); |
500 | return 0; |
501 | } |
502 | # We want to check that the UDP connect worked. However the only |
503 | # way to do that is to send a message and see if an ICMP is returned |
504 | _syslog_send_socket(""); |
505 | if (!connection_ok()) { |
506 | push(@{$errs}, "udp connect: nobody listening"); |
507 | return 0; |
508 | } |
509 | $syslog_send = \&_syslog_send_socket; |
510 | return 1; |
511 | } |
512 | |
513 | sub connect_stream { |
514 | my ($errs) = @_; |
515 | # might want syslog_path to be variable based on syslog.h (if only |
516 | # it were in there!) |
517 | $syslog_path = '/dev/conslog'; |
518 | if (!-w $syslog_path) { |
519 | push(@{$errs}, "stream $syslog_path is not writable"); |
520 | return 0; |
521 | } |
522 | if (!open(SYSLOG, ">" . $syslog_path)) { |
523 | push(@{$errs}, "stream can't open $syslog_path: $!"); |
524 | return 0; |
525 | } |
526 | $syslog_send = \&_syslog_send_stream; |
527 | return 1; |
528 | } |
529 | |
530 | sub connect_unix { |
531 | my ($errs) = @_; |
532 | if (length _PATH_LOG()) { |
533 | $syslog_path = _PATH_LOG(); |
cb63fe9d |
534 | } else { |
23642f4b |
535 | push(@{$errs}, "_PATH_LOG not available in syslog.h"); |
536 | return 0; |
537 | } |
538 | my $that = sockaddr_un($syslog_path); |
539 | if (!$that) { |
540 | push(@{$errs}, "can't locate $syslog_path"); |
541 | return 0; |
542 | } |
543 | if (!socket(SYSLOG,AF_UNIX,SOCK_STREAM,0)) { |
544 | push(@{$errs}, "unix stream socket: $!"); |
545 | return 0; |
546 | } |
60b8437d |
547 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
548 | if (!socket(SYSLOG,AF_UNIX,SOCK_DGRAM,0)) { |
549 | push(@{$errs}, "unix dgram socket: $!"); |
550 | return 0; |
551 | } |
60b8437d |
552 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
553 | push(@{$errs}, "unix dgram connect: $!"); |
554 | return 0; |
555 | } |
cb63fe9d |
556 | } |
23642f4b |
557 | $syslog_send = \&_syslog_send_socket; |
558 | return 1; |
559 | } |
560 | |
561 | sub connect_console { |
562 | my ($errs) = @_; |
563 | if (!-w '/dev/console') { |
564 | push(@{$errs}, "console is not writable"); |
565 | return 0; |
566 | } |
567 | $syslog_send = \&_syslog_send_console; |
568 | return 1; |
569 | } |
570 | |
571 | # to test if the connection is still good, we need to check if any |
572 | # errors are present on the connection. The errors will not be raised |
573 | # by a write. Instead, sockets are made readable and the next read |
574 | # would cause the error to be returned. Unfortunately the syslog |
575 | # 'protocol' never provides anything for us to read. But with |
576 | # judicious use of select(), we can see if it would be readable... |
577 | sub connection_ok { |
dbfdd438 |
578 | return 1 if (defined $current_proto && $current_proto eq 'console'); |
23642f4b |
579 | my $rin = ''; |
580 | vec($rin, fileno(SYSLOG), 1) = 1; |
581 | my $ret = select $rin, undef, $rin, 0; |
582 | return ($ret ? 0 : 1); |
a0d0e21e |
583 | } |
584 | |
585 | sub disconnect { |
586 | close SYSLOG; |
587 | $connected = 0; |
23642f4b |
588 | $syslog_send = undef; |
a0d0e21e |
589 | } |
590 | |
591 | 1; |