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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); |
60b8437d |
10 | $VERSION = '0.03'; |
a0d0e21e |
11 | |
23642f4b |
12 | # it would be nice to try stream/unix first, since that will be |
13 | # most efficient. However streams are dodgy - see _syslog_send_stream |
14 | #my @connectMethods = ( 'stream', 'unix', 'tcp', 'udp' ); |
15 | my @connectMethods = ( 'tcp', 'udp', 'unix', 'stream', 'console' ); |
dbfdd438 |
16 | if ($^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 | # adapted from syslog.pl |
a0d0e21e |
30 | # |
5be1dfc7 |
31 | # Tom Christiansen <tchrist@convex.com> |
a0d0e21e |
32 | # modified to use sockets by Larry Wall <lwall@jpl-devvax.jpl.nasa.gov> |
33 | # NOTE: openlog now takes three arguments, just like openlog(3) |
3ffabb8c |
34 | # Modified to add UNIX domain sockets by Sean Robinson <robinson_s@sc.maricopa.edu> |
35 | # with support from Tim Bunce <Tim.Bunce@ig.co.uk> and the perl5-porters mailing list |
8ce86de8 |
36 | # Modified to use an XS backend instead of syslog.ph by Tom Hughes <tom@compton.nu> |
3ffabb8c |
37 | |
5be1dfc7 |
38 | =head1 NAME |
39 | |
40 | Sys::Syslog, openlog, closelog, setlogmask, syslog - Perl interface to the UNIX syslog(3) calls |
41 | |
42 | =head1 SYNOPSIS |
43 | |
3ffabb8c |
44 | use Sys::Syslog; # all except setlogsock, or: |
45 | use Sys::Syslog qw(:DEFAULT setlogsock); # default set, plus setlogsock |
5be1dfc7 |
46 | |
3ffabb8c |
47 | setlogsock $sock_type; |
5be1dfc7 |
48 | openlog $ident, $logopt, $facility; |
2eae817d |
49 | syslog $priority, $format, @args; |
5be1dfc7 |
50 | $oldmask = setlogmask $mask_priority; |
51 | closelog; |
52 | |
53 | =head1 DESCRIPTION |
54 | |
55 | Sys::Syslog is an interface to the UNIX C<syslog(3)> program. |
56 | Call C<syslog()> with a string priority and a list of C<printf()> args |
57 | just like C<syslog(3)>. |
58 | |
59 | Syslog provides the functions: |
60 | |
bbc7dcd2 |
61 | =over 4 |
5be1dfc7 |
62 | |
63 | =item openlog $ident, $logopt, $facility |
64 | |
23642f4b |
65 | I<$ident> is prepended to every message. I<$logopt> contains zero or |
66 | more of the words I<pid>, I<ndelay>, I<nowait>. The cons option is |
67 | ignored, since the failover mechanism will drop down to the console |
68 | automatically if all other media fail. I<$facility> specifies the |
69 | part of the system |
5be1dfc7 |
70 | |
2eae817d |
71 | =item syslog $priority, $format, @args |
5be1dfc7 |
72 | |
2eae817d |
73 | If I<$priority> permits, logs I<($format, @args)> |
5be1dfc7 |
74 | printed as by C<printf(3V)>, with the addition that I<%m> |
75 | is replaced with C<"$!"> (the latest error message). |
76 | |
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 | |
23642f4b |
87 | A value of 'unix' will connect to the UNIX domain socket returned by |
88 | the C<_PATH_LOG> macro (if your system defines it) in F<syslog.ph>. A |
89 | value of 'stream' will connect to the stream indicated by the pathname |
90 | provided as the optional second parameter. A value of 'inet' will |
91 | connect to an INET socket (either tcp or udp, tried in that order) |
92 | returned by getservbyname(). 'tcp' and 'udp' can also be given as |
93 | values. The value 'console' will send messages directly to the |
94 | console, as for the 'cons' option in the logopts in openlog(). |
95 | |
96 | A reference to an array can also be passed as the first parameter. |
97 | When this calling method is used, the array should contain a list of |
98 | sock_types which are attempted in order. |
cb63fe9d |
99 | |
23642f4b |
100 | The default is to try tcp, udp, unix, stream, console. |
101 | |
102 | Giving an invalid value for sock_type will croak. |
cb63fe9d |
103 | |
5be1dfc7 |
104 | =item closelog |
105 | |
106 | Closes the log file. |
107 | |
108 | =back |
109 | |
110 | Note that C<openlog> now takes three arguments, just like C<openlog(3)>. |
111 | |
112 | =head1 EXAMPLES |
113 | |
114 | openlog($program, 'cons,pid', 'user'); |
115 | syslog('info', 'this is another test'); |
116 | syslog('mail|warning', 'this is a better test: %d', time); |
117 | closelog(); |
118 | |
119 | syslog('debug', 'this is the last test'); |
cb63fe9d |
120 | |
121 | setlogsock('unix'); |
5be1dfc7 |
122 | openlog("$program $$", 'ndelay', 'user'); |
123 | syslog('notice', 'fooprogram: this is really done'); |
124 | |
cb63fe9d |
125 | setlogsock('inet'); |
5be1dfc7 |
126 | $! = 55; |
127 | syslog('info', 'problem was %m'); # %m == $! in syslog(3) |
128 | |
5be1dfc7 |
129 | =head1 SEE ALSO |
130 | |
131 | L<syslog(3)> |
132 | |
133 | =head1 AUTHOR |
134 | |
150b260b |
135 | Tom Christiansen E<lt>F<tchrist@perl.com>E<gt> and Larry Wall |
136 | E<lt>F<larry@wall.org>E<gt>. |
137 | |
138 | UNIX domain sockets added by Sean Robinson |
23642f4b |
139 | E<lt>F<robinson_s@sc.maricopa.edu>E<gt> with support from Tim Bunce |
a88817a4 |
140 | E<lt>F<Tim.Bunce@ig.co.uk>E<gt> and the perl5-porters mailing list. |
150b260b |
141 | |
142 | Dependency on F<syslog.ph> replaced with XS code by Tom Hughes |
143 | E<lt>F<tom@compton.nu>E<gt>. |
5be1dfc7 |
144 | |
23642f4b |
145 | Code for constant()s regenerated by Nicholas Clark E<lt>F<nick@ccl4.org>E<gt>. |
146 | |
147 | Failover to different communication modes by Nick Williams |
148 | E<lt>F<Nick.Williams@morganstanley.com>E<gt>. |
b903fcff |
149 | |
5be1dfc7 |
150 | =cut |
a0d0e21e |
151 | |
8ce86de8 |
152 | sub AUTOLOAD { |
153 | # This AUTOLOAD is used to 'autoload' constants from the constant() |
154 | # XS function. |
23642f4b |
155 | |
8ce86de8 |
156 | my $constname; |
157 | our $AUTOLOAD; |
158 | ($constname = $AUTOLOAD) =~ s/.*:://; |
b903fcff |
159 | croak "&Sys::Syslog::constant not defined" if $constname eq 'constant'; |
160 | my ($error, $val) = constant($constname); |
161 | if ($error) { |
162 | croak $error; |
8ce86de8 |
163 | } |
164 | *$AUTOLOAD = sub { $val }; |
165 | goto &$AUTOLOAD; |
166 | } |
167 | |
168 | bootstrap Sys::Syslog $VERSION; |
a0d0e21e |
169 | |
170 | $maskpri = &LOG_UPTO(&LOG_DEBUG); |
171 | |
172 | sub openlog { |
173 | ($ident, $logopt, $facility) = @_; # package vars |
174 | $lo_pid = $logopt =~ /\bpid\b/; |
175 | $lo_ndelay = $logopt =~ /\bndelay\b/; |
a0d0e21e |
176 | $lo_nowait = $logopt =~ /\bnowait\b/; |
a8710ca1 |
177 | return 1 unless $lo_ndelay; |
178 | &connect; |
a0d0e21e |
179 | } |
180 | |
181 | sub closelog { |
182 | $facility = $ident = ''; |
183 | &disconnect; |
184 | } |
185 | |
186 | sub setlogmask { |
187 | local($oldmask) = $maskpri; |
188 | $maskpri = shift; |
189 | $oldmask; |
190 | } |
191 | |
cb63fe9d |
192 | sub setlogsock { |
193 | local($setsock) = shift; |
23642f4b |
194 | $syslog_path = shift; |
3ffabb8c |
195 | &disconnect if $connected; |
23642f4b |
196 | $transmit_ok = 0; |
197 | @fallbackMethods = (); |
198 | @connectMethods = @defaultMethods; |
199 | if (ref $setsock eq 'ARRAY') { |
200 | @connectMethods = @$setsock; |
201 | } elsif (lc($setsock) eq 'stream') { |
202 | $syslog_path = '/dev/log' unless($syslog_path); |
203 | if (!-w $syslog_path) { |
204 | carp "stream passed to setlogsock, but $syslog_path is not writable"; |
205 | return undef; |
206 | } else { |
207 | @connectMethods = ( 'stream' ); |
208 | } |
209 | } elsif (lc($setsock) eq 'unix') { |
210 | if (length _PATH_LOG() && !defined $syslog_path) { |
211 | $syslog_path = _PATH_LOG(); |
212 | @connectMethods = ( 'unix' ); |
3ffabb8c |
213 | } else { |
23642f4b |
214 | carp 'unix passed to setlogsock, but path not available'; |
215 | return undef; |
3ffabb8c |
216 | } |
23642f4b |
217 | } elsif (lc($setsock) eq 'tcp') { |
218 | if (getservbyname('syslog', 'tcp') || getservbyname('syslogng', 'tcp')) { |
219 | @connectMethods = ( 'tcp' ); |
220 | } else { |
221 | carp "tcp passed to setlogsock, but tcp service unavailable"; |
222 | return undef; |
223 | } |
224 | } elsif (lc($setsock) eq 'udp') { |
225 | if (getservbyname('syslog', 'udp')) { |
226 | @connectMethods = ( 'udp' ); |
227 | } else { |
228 | carp "udp passed to setlogsock, but udp service unavailable"; |
229 | return undef; |
230 | } |
cb63fe9d |
231 | } elsif (lc($setsock) eq 'inet') { |
23642f4b |
232 | @connectMethods = ( 'tcp', 'udp' ); |
233 | } elsif (lc($setsock) eq 'console') { |
234 | @connectMethods = ( 'console' ); |
cb63fe9d |
235 | } else { |
23642f4b |
236 | carp "Invalid argument passed to setlogsock; must be 'stream', 'unix', 'tcp', 'udp' or 'inet'"; |
cb63fe9d |
237 | } |
f8b75b0c |
238 | return 1; |
cb63fe9d |
239 | } |
240 | |
a0d0e21e |
241 | sub syslog { |
242 | local($priority) = shift; |
243 | local($mask) = shift; |
244 | local($message, $whoami); |
245 | local(@words, $num, $numpri, $numfac, $sum); |
246 | local($facility) = $facility; # may need to change temporarily. |
247 | |
248 | croak "syslog: expected both priority and mask" unless $mask && $priority; |
249 | |
250 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility". |
251 | undef $numpri; |
252 | undef $numfac; |
253 | foreach (@words) { |
254 | $num = &xlate($_); # Translate word to number. |
255 | if (/^kern$/ || $num < 0) { |
256 | croak "syslog: invalid level/facility: $_"; |
257 | } |
258 | elsif ($num <= &LOG_PRIMASK) { |
259 | croak "syslog: too many levels given: $_" if defined($numpri); |
260 | $numpri = $num; |
261 | return 0 unless &LOG_MASK($numpri) & $maskpri; |
262 | } |
263 | else { |
264 | croak "syslog: too many facilities given: $_" if defined($numfac); |
265 | $facility = $_; |
266 | $numfac = $num; |
267 | } |
268 | } |
269 | |
270 | croak "syslog: level must be given" unless defined($numpri); |
271 | |
272 | if (!defined($numfac)) { # Facility not specified in this call. |
273 | $facility = 'user' unless $facility; |
274 | $numfac = &xlate($facility); |
275 | } |
276 | |
277 | &connect unless $connected; |
278 | |
279 | $whoami = $ident; |
280 | |
5dad0344 |
281 | if (!$whoami && $mask =~ /^(\S.*?):\s?(.*)/) { |
a0d0e21e |
282 | $whoami = $1; |
283 | $mask = $2; |
284 | } |
285 | |
286 | unless ($whoami) { |
287 | ($whoami = getlogin) || |
288 | ($whoami = getpwuid($<)) || |
289 | ($whoami = 'syslog'); |
290 | } |
291 | |
292 | $whoami .= "[$$]" if $lo_pid; |
293 | |
294 | $mask =~ s/%m/$!/g; |
295 | $mask .= "\n" unless $mask =~ /\n$/; |
296 | $message = sprintf ($mask, @_); |
297 | |
298 | $sum = $numpri + $numfac; |
23642f4b |
299 | my $buf = "<$sum>$whoami: $message\0"; |
300 | |
301 | # it's possible that we'll get an error from sending |
302 | # (e.g. if method is UDP and there is no UDP listener, |
303 | # then we'll get ECONNREFUSED on the send). So what we |
304 | # want to do at this point is to fallback onto a different |
305 | # connection method. |
306 | while (scalar @fallbackMethods || $syslog_send) { |
307 | if ($failed && (time - $fail_time) > 60) { |
308 | # it's been a while... maybe things have been fixed |
309 | @fallbackMethods = (); |
310 | disconnect(); |
311 | $transmit_ok = 0; # make it look like a fresh attempt |
312 | &connect; |
313 | } |
314 | if ($connected && !connection_ok()) { |
315 | # Something was OK, but has now broken. Remember coz we'll |
316 | # want to go back to what used to be OK. |
317 | $failed = $current_proto unless $failed; |
318 | $fail_time = time; |
319 | disconnect(); |
320 | } |
321 | &connect unless $connected; |
60b8437d |
322 | $failed = undef if ($current_proto && $failed && $current_proto eq $failed); |
23642f4b |
323 | if ($syslog_send) { |
324 | if (&{$syslog_send}($buf)) { |
325 | $transmit_ok++; |
326 | return 1; |
a0d0e21e |
327 | } |
23642f4b |
328 | # typically doesn't happen, since errors are rare from write(). |
329 | disconnect(); |
330 | } |
331 | } |
332 | # could not send, could not fallback onto a working |
333 | # connection method. Lose. |
334 | return 0; |
335 | } |
336 | |
337 | sub _syslog_send_console { |
338 | my ($buf) = @_; |
339 | chop($buf); # delete the NUL from the end |
340 | # The console print is a method which could block |
341 | # so we do it in a child process and always return success |
342 | # to the caller. |
343 | if (my $pid = fork) { |
344 | if ($lo_nowait) { |
345 | return 1; |
346 | } else { |
347 | if (waitpid($pid, 0) >= 0) { |
348 | return ($? >> 8); |
349 | } else { |
350 | # it's possible that the caller has other |
351 | # plans for SIGCHLD, so let's not interfere |
352 | return 1; |
a0d0e21e |
353 | } |
354 | } |
23642f4b |
355 | } else { |
356 | if (open(CONS, ">/dev/console")) { |
357 | my $ret = print CONS $buf . "\r"; |
358 | exit ($ret) if defined $pid; |
359 | close CONS; |
360 | } |
361 | exit if defined $pid; |
a0d0e21e |
362 | } |
363 | } |
364 | |
23642f4b |
365 | sub _syslog_send_stream { |
366 | my ($buf) = @_; |
367 | # XXX: this only works if the OS stream implementation makes a write |
368 | # look like a putmsg() with simple header. For instance it works on |
369 | # Solaris 8 but not Solaris 7. |
370 | # To be correct, it should use a STREAMS API, but perl doesn't have one. |
371 | return syswrite(SYSLOG, $buf, length($buf)); |
372 | } |
373 | sub _syslog_send_socket { |
374 | my ($buf) = @_; |
375 | return syswrite(SYSLOG, $buf, length($buf)); |
376 | #return send(SYSLOG, $buf, 0); |
377 | } |
378 | |
a0d0e21e |
379 | sub xlate { |
380 | local($name) = @_; |
55497cff |
381 | $name = uc $name; |
a0d0e21e |
382 | $name = "LOG_$name" unless $name =~ /^LOG_/; |
748a9306 |
383 | $name = "Sys::Syslog::$name"; |
2c3b42a1 |
384 | # Can't have just eval { &$name } || -1 because some LOG_XXX may be zero. |
385 | my $value = eval { &$name }; |
386 | defined $value ? $value : -1; |
a0d0e21e |
387 | } |
388 | |
389 | sub connect { |
23642f4b |
390 | @fallbackMethods = @connectMethods unless (scalar @fallbackMethods); |
391 | if ($transmit_ok && $current_proto) { |
392 | # Retry what we were on, because it's worked in the past. |
393 | unshift(@fallbackMethods, $current_proto); |
394 | } |
395 | $connected = 0; |
396 | my @errs = (); |
397 | my $proto = undef; |
398 | while ($proto = shift(@fallbackMethods)) { |
399 | my $fn = "connect_$proto"; |
400 | $connected = &$fn(\@errs) unless (!defined &$fn); |
401 | last if ($connected); |
402 | } |
403 | |
404 | $transmit_ok = 0; |
405 | if ($connected) { |
60b8437d |
406 | $current_proto = $proto; |
23642f4b |
407 | local($old) = select(SYSLOG); $| = 1; select($old); |
408 | } else { |
409 | @fallbackMethods = (); |
410 | foreach my $err (@errs) { |
411 | carp $err; |
412 | } |
413 | croak "no connection to syslog available"; |
414 | } |
415 | } |
416 | |
417 | sub connect_tcp { |
418 | my ($errs) = @_; |
419 | unless ($host) { |
420 | require Sys::Hostname; |
421 | my($host_uniq) = Sys::Hostname::hostname(); |
422 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
423 | } |
424 | my $tcp = getprotobyname('tcp'); |
425 | if (!defined $tcp) { |
426 | push(@{$errs}, "getprotobyname failed for tcp"); |
427 | return 0; |
428 | } |
429 | my $syslog = getservbyname('syslog','tcp'); |
430 | $syslog = getservbyname('syslogng','tcp') unless (defined $syslog); |
431 | if (!defined $syslog) { |
432 | push(@{$errs}, "getservbyname failed for tcp"); |
433 | return 0; |
434 | } |
435 | |
436 | my $this = sockaddr_in($syslog, INADDR_ANY); |
437 | my $that = sockaddr_in($syslog, inet_aton($host)); |
438 | if (!$that) { |
439 | push(@{$errs}, "can't lookup $host"); |
440 | return 0; |
441 | } |
442 | if (!socket(SYSLOG,AF_INET,SOCK_STREAM,$tcp)) { |
443 | push(@{$errs}, "tcp socket: $!"); |
444 | return 0; |
445 | } |
446 | setsockopt(SYSLOG, SOL_SOCKET, SO_KEEPALIVE, 1); |
447 | setsockopt(SYSLOG, IPPROTO_TCP, TCP_NODELAY, 1); |
60b8437d |
448 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
449 | push(@{$errs}, "tcp connect: $!"); |
450 | return 0; |
451 | } |
452 | $syslog_send = \&_syslog_send_socket; |
453 | return 1; |
454 | } |
455 | |
456 | sub connect_udp { |
457 | my ($errs) = @_; |
4fc7577b |
458 | unless ($host) { |
459 | require Sys::Hostname; |
2eae817d |
460 | my($host_uniq) = Sys::Hostname::hostname(); |
3e3baf6d |
461 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
4fc7577b |
462 | } |
23642f4b |
463 | my $udp = getprotobyname('udp'); |
464 | if (!defined $udp) { |
465 | push(@{$errs}, "getprotobyname failed for udp"); |
466 | return 0; |
467 | } |
468 | my $syslog = getservbyname('syslog','udp'); |
469 | if (!defined $syslog) { |
470 | push(@{$errs}, "getservbyname failed for udp"); |
471 | return 0; |
472 | } |
473 | my $this = sockaddr_in($syslog, INADDR_ANY); |
474 | my $that = sockaddr_in($syslog, inet_aton($host)); |
475 | if (!$that) { |
476 | push(@{$errs}, "can't lookup $host"); |
477 | return 0; |
478 | } |
479 | if (!socket(SYSLOG,AF_INET,SOCK_DGRAM,$udp)) { |
480 | push(@{$errs}, "udp socket: $!"); |
481 | return 0; |
482 | } |
60b8437d |
483 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
484 | push(@{$errs}, "udp connect: $!"); |
485 | return 0; |
486 | } |
487 | # We want to check that the UDP connect worked. However the only |
488 | # way to do that is to send a message and see if an ICMP is returned |
489 | _syslog_send_socket(""); |
490 | if (!connection_ok()) { |
491 | push(@{$errs}, "udp connect: nobody listening"); |
492 | return 0; |
493 | } |
494 | $syslog_send = \&_syslog_send_socket; |
495 | return 1; |
496 | } |
497 | |
498 | sub connect_stream { |
499 | my ($errs) = @_; |
500 | # might want syslog_path to be variable based on syslog.h (if only |
501 | # it were in there!) |
502 | $syslog_path = '/dev/conslog'; |
503 | if (!-w $syslog_path) { |
504 | push(@{$errs}, "stream $syslog_path is not writable"); |
505 | return 0; |
506 | } |
507 | if (!open(SYSLOG, ">" . $syslog_path)) { |
508 | push(@{$errs}, "stream can't open $syslog_path: $!"); |
509 | return 0; |
510 | } |
511 | $syslog_send = \&_syslog_send_stream; |
512 | return 1; |
513 | } |
514 | |
515 | sub connect_unix { |
516 | my ($errs) = @_; |
517 | if (length _PATH_LOG()) { |
518 | $syslog_path = _PATH_LOG(); |
cb63fe9d |
519 | } else { |
23642f4b |
520 | push(@{$errs}, "_PATH_LOG not available in syslog.h"); |
521 | return 0; |
522 | } |
523 | my $that = sockaddr_un($syslog_path); |
524 | if (!$that) { |
525 | push(@{$errs}, "can't locate $syslog_path"); |
526 | return 0; |
527 | } |
528 | if (!socket(SYSLOG,AF_UNIX,SOCK_STREAM,0)) { |
529 | push(@{$errs}, "unix stream socket: $!"); |
530 | return 0; |
531 | } |
60b8437d |
532 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
533 | if (!socket(SYSLOG,AF_UNIX,SOCK_DGRAM,0)) { |
534 | push(@{$errs}, "unix dgram socket: $!"); |
535 | return 0; |
536 | } |
60b8437d |
537 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
538 | push(@{$errs}, "unix dgram connect: $!"); |
539 | return 0; |
540 | } |
cb63fe9d |
541 | } |
23642f4b |
542 | $syslog_send = \&_syslog_send_socket; |
543 | return 1; |
544 | } |
545 | |
546 | sub connect_console { |
547 | my ($errs) = @_; |
548 | if (!-w '/dev/console') { |
549 | push(@{$errs}, "console is not writable"); |
550 | return 0; |
551 | } |
552 | $syslog_send = \&_syslog_send_console; |
553 | return 1; |
554 | } |
555 | |
556 | # to test if the connection is still good, we need to check if any |
557 | # errors are present on the connection. The errors will not be raised |
558 | # by a write. Instead, sockets are made readable and the next read |
559 | # would cause the error to be returned. Unfortunately the syslog |
560 | # 'protocol' never provides anything for us to read. But with |
561 | # judicious use of select(), we can see if it would be readable... |
562 | sub connection_ok { |
dbfdd438 |
563 | return 1 if (defined $current_proto && $current_proto eq 'console'); |
23642f4b |
564 | my $rin = ''; |
565 | vec($rin, fileno(SYSLOG), 1) = 1; |
566 | my $ret = select $rin, undef, $rin, 0; |
567 | return ($ret ? 0 : 1); |
a0d0e21e |
568 | } |
569 | |
570 | sub disconnect { |
571 | close SYSLOG; |
572 | $connected = 0; |
23642f4b |
573 | $syslog_send = undef; |
a0d0e21e |
574 | } |
575 | |
576 | 1; |