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a0d0e21e |
1 | package Sys::Syslog; |
3b355090 |
2 | require 5.006; |
a0d0e21e |
3 | require Exporter; |
4 | use Carp; |
108be7fb |
5 | use strict; |
a0d0e21e |
6 | |
db9f82cf |
7 | our @ISA = qw(Exporter); |
108be7fb |
8 | our @EXPORT = qw(openlog closelog setlogmask syslog); |
9 | our @EXPORT_OK = qw(setlogsock); |
ce43db9b |
10 | our $VERSION = '0.08'; |
a0d0e21e |
11 | |
23642f4b |
12 | # it would be nice to try stream/unix first, since that will be |
13 | # most efficient. However streams are dodgy - see _syslog_send_stream |
23642f4b |
14 | my @connectMethods = ( 'tcp', 'udp', 'unix', 'stream', 'console' ); |
dbfdd438 |
15 | if ($^O =~ /^(freebsd|linux)$/) { |
16 | @connectMethods = grep { $_ ne 'udp' } @connectMethods; |
17 | } |
23642f4b |
18 | my @defaultMethods = @connectMethods; |
19 | my $syslog_path = undef; |
20 | my $transmit_ok = 0; |
21 | my $current_proto = undef; |
22 | my $failed = undef; |
23 | my $fail_time = undef; |
108be7fb |
24 | our ($connected, @fallbackMethods, $syslog_send, $host); |
23642f4b |
25 | |
108be7fb |
26 | use Socket ':all'; |
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, $facility |
55 | |
b91ed019 |
56 | Opens the syslog. |
23642f4b |
57 | I<$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 |
b91ed019 |
63 | your system. This function will croak if it can't connect to the syslog |
64 | daemon. |
3d256c0f |
65 | |
66 | B<You should use openlog() before calling syslog().> |
5be1dfc7 |
67 | |
ce43db9b |
68 | =item syslog $priority, $message |
69 | |
2eae817d |
70 | =item syslog $priority, $format, @args |
5be1dfc7 |
71 | |
caccce6a |
72 | If I<$priority> permits, logs I<$message> or I<sprintf($format, @args)> |
73 | with the addition that I<%m> in $message or $format is replaced with |
74 | C<"$!"> (the latest error message). |
5be1dfc7 |
75 | |
3d256c0f |
76 | If you didn't use openlog() before using syslog(), syslog will try to |
77 | guess the I<$ident> by extracting the shortest prefix of I<$format> |
78 | that ends in a ":". |
79 | |
5be1dfc7 |
80 | =item setlogmask $mask_priority |
81 | |
82 | Sets log mask I<$mask_priority> and returns the old mask. |
83 | |
23642f4b |
84 | =item setlogsock $sock_type [$stream_location] (added in 5.004_02) |
3ffabb8c |
85 | |
cb63fe9d |
86 | Sets the socket type to be used for the next call to |
3ffabb8c |
87 | C<openlog()> or C<syslog()> and returns TRUE on success, |
88 | undef on failure. |
89 | |
f66a7beb |
90 | A value of 'unix' will connect to the UNIX domain socket (in some |
91 | systems a character special device) returned by the C<_PATH_LOG> macro |
92 | (if your system defines it), or F</dev/log> or F</dev/conslog>, |
93 | whatever is writable. A value of 'stream' will connect to the stream |
94 | indicated by the pathname provided as the optional second parameter. |
e9aaaa2f |
95 | (For example Solaris and IRIX require 'stream' instead of 'unix'.) |
f66a7beb |
96 | A value of 'inet' will connect to an INET socket (either tcp or udp, |
97 | tried in that order) returned by getservbyname(). 'tcp' and 'udp' can |
98 | also be given as values. The value 'console' will send messages |
99 | directly to the console, as for the 'cons' option in the logopts in |
100 | openlog(). |
23642f4b |
101 | |
102 | A reference to an array can also be passed as the first parameter. |
103 | When this calling method is used, the array should contain a list of |
104 | sock_types which are attempted in order. |
cb63fe9d |
105 | |
23642f4b |
106 | The default is to try tcp, udp, unix, stream, console. |
107 | |
108 | Giving an invalid value for sock_type will croak. |
cb63fe9d |
109 | |
5be1dfc7 |
110 | =item closelog |
111 | |
112 | Closes the log file. |
113 | |
114 | =back |
115 | |
116 | Note that C<openlog> now takes three arguments, just like C<openlog(3)>. |
117 | |
118 | =head1 EXAMPLES |
119 | |
120 | openlog($program, 'cons,pid', 'user'); |
e6c138cd |
121 | syslog('info', '%s', 'this is another test'); |
5be1dfc7 |
122 | syslog('mail|warning', 'this is a better test: %d', time); |
123 | closelog(); |
124 | |
125 | syslog('debug', 'this is the last test'); |
cb63fe9d |
126 | |
127 | setlogsock('unix'); |
5be1dfc7 |
128 | openlog("$program $$", 'ndelay', 'user'); |
129 | syslog('notice', 'fooprogram: this is really done'); |
130 | |
cb63fe9d |
131 | setlogsock('inet'); |
5be1dfc7 |
132 | $! = 55; |
133 | syslog('info', 'problem was %m'); # %m == $! in syslog(3) |
134 | |
476b65d9 |
135 | # Log to UDP port on $remotehost instead of logging locally |
136 | setlogsock('udp'); |
137 | $Sys::Syslog::host = $remotehost; |
138 | openlog($program, 'ndelay', 'user'); |
139 | syslog('info', 'something happened over here'); |
140 | |
5be1dfc7 |
141 | =head1 SEE ALSO |
142 | |
143 | L<syslog(3)> |
144 | |
145 | =head1 AUTHOR |
146 | |
150b260b |
147 | Tom Christiansen E<lt>F<tchrist@perl.com>E<gt> and Larry Wall |
148 | E<lt>F<larry@wall.org>E<gt>. |
149 | |
150 | UNIX domain sockets added by Sean Robinson |
23642f4b |
151 | E<lt>F<robinson_s@sc.maricopa.edu>E<gt> with support from Tim Bunce |
a88817a4 |
152 | E<lt>F<Tim.Bunce@ig.co.uk>E<gt> and the perl5-porters mailing list. |
150b260b |
153 | |
154 | Dependency on F<syslog.ph> replaced with XS code by Tom Hughes |
155 | E<lt>F<tom@compton.nu>E<gt>. |
5be1dfc7 |
156 | |
23642f4b |
157 | Code for constant()s regenerated by Nicholas Clark E<lt>F<nick@ccl4.org>E<gt>. |
158 | |
159 | Failover to different communication modes by Nick Williams |
160 | E<lt>F<Nick.Williams@morganstanley.com>E<gt>. |
b903fcff |
161 | |
5be1dfc7 |
162 | =cut |
a0d0e21e |
163 | |
8ce86de8 |
164 | sub AUTOLOAD { |
165 | # This AUTOLOAD is used to 'autoload' constants from the constant() |
166 | # XS function. |
23642f4b |
167 | |
8ce86de8 |
168 | my $constname; |
169 | our $AUTOLOAD; |
170 | ($constname = $AUTOLOAD) =~ s/.*:://; |
b903fcff |
171 | croak "&Sys::Syslog::constant not defined" if $constname eq 'constant'; |
172 | my ($error, $val) = constant($constname); |
173 | if ($error) { |
174 | croak $error; |
8ce86de8 |
175 | } |
108be7fb |
176 | no strict 'refs'; |
8ce86de8 |
177 | *$AUTOLOAD = sub { $val }; |
178 | goto &$AUTOLOAD; |
179 | } |
180 | |
db9f82cf |
181 | require XSLoader; |
182 | XSLoader::load('Sys::Syslog', $VERSION); |
a0d0e21e |
183 | |
108be7fb |
184 | our $maskpri = &LOG_UPTO(&LOG_DEBUG); |
a0d0e21e |
185 | |
186 | sub openlog { |
108be7fb |
187 | our ($ident, $logopt, $facility) = @_; # package vars |
188 | our $lo_pid = $logopt =~ /\bpid\b/; |
189 | our $lo_ndelay = $logopt =~ /\bndelay\b/; |
190 | our $lo_nowait = $logopt =~ /\bnowait\b/; |
a8710ca1 |
191 | return 1 unless $lo_ndelay; |
192 | &connect; |
a0d0e21e |
193 | } |
194 | |
195 | sub closelog { |
108be7fb |
196 | our $facility = our $ident = ''; |
a0d0e21e |
197 | &disconnect; |
198 | } |
199 | |
200 | sub setlogmask { |
108be7fb |
201 | my $oldmask = $maskpri; |
a0d0e21e |
202 | $maskpri = shift; |
203 | $oldmask; |
204 | } |
205 | |
cb63fe9d |
206 | sub setlogsock { |
108be7fb |
207 | my $setsock = shift; |
23642f4b |
208 | $syslog_path = shift; |
3ffabb8c |
209 | &disconnect if $connected; |
23642f4b |
210 | $transmit_ok = 0; |
211 | @fallbackMethods = (); |
212 | @connectMethods = @defaultMethods; |
213 | if (ref $setsock eq 'ARRAY') { |
214 | @connectMethods = @$setsock; |
215 | } elsif (lc($setsock) eq 'stream') { |
f66a7beb |
216 | unless (defined $syslog_path) { |
217 | my @try = qw(/dev/log /dev/conslog); |
e863979d |
218 | if (length &_PATH_LOG) { # Undefined _PATH_LOG is "". |
f66a7beb |
219 | unshift @try, &_PATH_LOG; |
220 | } |
221 | for my $try (@try) { |
222 | if (-w $try) { |
223 | $syslog_path = $try; |
224 | last; |
225 | } |
226 | } |
e863979d |
227 | carp "stream passed to setlogsock, but could not find any device" |
228 | unless defined $syslog_path; |
f66a7beb |
229 | } |
e863979d |
230 | unless (-w $syslog_path) { |
23642f4b |
231 | carp "stream passed to setlogsock, but $syslog_path is not writable"; |
232 | return undef; |
233 | } else { |
234 | @connectMethods = ( 'stream' ); |
235 | } |
236 | } elsif (lc($setsock) eq 'unix') { |
237 | if (length _PATH_LOG() && !defined $syslog_path) { |
238 | $syslog_path = _PATH_LOG(); |
239 | @connectMethods = ( 'unix' ); |
3ffabb8c |
240 | } else { |
23642f4b |
241 | carp 'unix passed to setlogsock, but path not available'; |
242 | return undef; |
3ffabb8c |
243 | } |
23642f4b |
244 | } elsif (lc($setsock) eq 'tcp') { |
245 | if (getservbyname('syslog', 'tcp') || getservbyname('syslogng', 'tcp')) { |
246 | @connectMethods = ( 'tcp' ); |
247 | } else { |
248 | carp "tcp passed to setlogsock, but tcp service unavailable"; |
249 | return undef; |
250 | } |
251 | } elsif (lc($setsock) eq 'udp') { |
252 | if (getservbyname('syslog', 'udp')) { |
253 | @connectMethods = ( 'udp' ); |
254 | } else { |
255 | carp "udp passed to setlogsock, but udp service unavailable"; |
256 | return undef; |
257 | } |
cb63fe9d |
258 | } elsif (lc($setsock) eq 'inet') { |
23642f4b |
259 | @connectMethods = ( 'tcp', 'udp' ); |
260 | } elsif (lc($setsock) eq 'console') { |
261 | @connectMethods = ( 'console' ); |
cb63fe9d |
262 | } else { |
23642f4b |
263 | carp "Invalid argument passed to setlogsock; must be 'stream', 'unix', 'tcp', 'udp' or 'inet'"; |
cb63fe9d |
264 | } |
f8b75b0c |
265 | return 1; |
cb63fe9d |
266 | } |
267 | |
a0d0e21e |
268 | sub syslog { |
108be7fb |
269 | my $priority = shift; |
270 | my $mask = shift; |
271 | my ($message, $whoami); |
272 | my (@words, $num, $numpri, $numfac, $sum); |
273 | our $facility; |
a0d0e21e |
274 | local($facility) = $facility; # may need to change temporarily. |
275 | |
78ac6fa8 |
276 | croak "syslog: expecting argument \$priority" unless $priority; |
277 | croak "syslog: expecting argument \$format" unless $mask; |
a0d0e21e |
278 | |
279 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility". |
280 | undef $numpri; |
281 | undef $numfac; |
282 | foreach (@words) { |
283 | $num = &xlate($_); # Translate word to number. |
284 | if (/^kern$/ || $num < 0) { |
285 | croak "syslog: invalid level/facility: $_"; |
286 | } |
287 | elsif ($num <= &LOG_PRIMASK) { |
288 | croak "syslog: too many levels given: $_" if defined($numpri); |
289 | $numpri = $num; |
290 | return 0 unless &LOG_MASK($numpri) & $maskpri; |
291 | } |
292 | else { |
293 | croak "syslog: too many facilities given: $_" if defined($numfac); |
294 | $facility = $_; |
295 | $numfac = $num; |
296 | } |
297 | } |
298 | |
299 | croak "syslog: level must be given" unless defined($numpri); |
300 | |
301 | if (!defined($numfac)) { # Facility not specified in this call. |
302 | $facility = 'user' unless $facility; |
303 | $numfac = &xlate($facility); |
304 | } |
305 | |
306 | &connect unless $connected; |
307 | |
108be7fb |
308 | $whoami = our $ident; |
a0d0e21e |
309 | |
5dad0344 |
310 | if (!$whoami && $mask =~ /^(\S.*?):\s?(.*)/) { |
a0d0e21e |
311 | $whoami = $1; |
312 | $mask = $2; |
313 | } |
314 | |
315 | unless ($whoami) { |
316 | ($whoami = getlogin) || |
317 | ($whoami = getpwuid($<)) || |
318 | ($whoami = 'syslog'); |
319 | } |
320 | |
108be7fb |
321 | $whoami .= "[$$]" if our $lo_pid; |
a0d0e21e |
322 | |
3b355090 |
323 | $mask =~ s/(?<!%)%m/$!/g; |
a0d0e21e |
324 | $mask .= "\n" unless $mask =~ /\n$/; |
ce43db9b |
325 | $message = @_ ? sprintf($mask, @_) : $mask; |
a0d0e21e |
326 | |
327 | $sum = $numpri + $numfac; |
23642f4b |
328 | my $buf = "<$sum>$whoami: $message\0"; |
329 | |
330 | # it's possible that we'll get an error from sending |
331 | # (e.g. if method is UDP and there is no UDP listener, |
332 | # then we'll get ECONNREFUSED on the send). So what we |
333 | # want to do at this point is to fallback onto a different |
334 | # connection method. |
335 | while (scalar @fallbackMethods || $syslog_send) { |
336 | if ($failed && (time - $fail_time) > 60) { |
337 | # it's been a while... maybe things have been fixed |
338 | @fallbackMethods = (); |
339 | disconnect(); |
340 | $transmit_ok = 0; # make it look like a fresh attempt |
341 | &connect; |
342 | } |
343 | if ($connected && !connection_ok()) { |
344 | # Something was OK, but has now broken. Remember coz we'll |
345 | # want to go back to what used to be OK. |
346 | $failed = $current_proto unless $failed; |
347 | $fail_time = time; |
348 | disconnect(); |
349 | } |
350 | &connect unless $connected; |
60b8437d |
351 | $failed = undef if ($current_proto && $failed && $current_proto eq $failed); |
23642f4b |
352 | if ($syslog_send) { |
353 | if (&{$syslog_send}($buf)) { |
354 | $transmit_ok++; |
355 | return 1; |
a0d0e21e |
356 | } |
23642f4b |
357 | # typically doesn't happen, since errors are rare from write(). |
358 | disconnect(); |
359 | } |
360 | } |
361 | # could not send, could not fallback onto a working |
362 | # connection method. Lose. |
363 | return 0; |
364 | } |
365 | |
366 | sub _syslog_send_console { |
367 | my ($buf) = @_; |
368 | chop($buf); # delete the NUL from the end |
369 | # The console print is a method which could block |
370 | # so we do it in a child process and always return success |
371 | # to the caller. |
372 | if (my $pid = fork) { |
108be7fb |
373 | our $lo_nowait; |
23642f4b |
374 | if ($lo_nowait) { |
375 | return 1; |
376 | } else { |
377 | if (waitpid($pid, 0) >= 0) { |
378 | return ($? >> 8); |
379 | } else { |
380 | # it's possible that the caller has other |
381 | # plans for SIGCHLD, so let's not interfere |
382 | return 1; |
a0d0e21e |
383 | } |
384 | } |
23642f4b |
385 | } else { |
386 | if (open(CONS, ">/dev/console")) { |
387 | my $ret = print CONS $buf . "\r"; |
388 | exit ($ret) if defined $pid; |
389 | close CONS; |
390 | } |
391 | exit if defined $pid; |
a0d0e21e |
392 | } |
393 | } |
394 | |
23642f4b |
395 | sub _syslog_send_stream { |
396 | my ($buf) = @_; |
397 | # XXX: this only works if the OS stream implementation makes a write |
398 | # look like a putmsg() with simple header. For instance it works on |
399 | # Solaris 8 but not Solaris 7. |
400 | # To be correct, it should use a STREAMS API, but perl doesn't have one. |
401 | return syswrite(SYSLOG, $buf, length($buf)); |
402 | } |
403 | sub _syslog_send_socket { |
404 | my ($buf) = @_; |
405 | return syswrite(SYSLOG, $buf, length($buf)); |
406 | #return send(SYSLOG, $buf, 0); |
407 | } |
408 | |
a0d0e21e |
409 | sub xlate { |
108be7fb |
410 | my($name) = @_; |
b9f13614 |
411 | return $name+0 if $name =~ /^\s*\d+\s*$/; |
55497cff |
412 | $name = uc $name; |
a0d0e21e |
413 | $name = "LOG_$name" unless $name =~ /^LOG_/; |
748a9306 |
414 | $name = "Sys::Syslog::$name"; |
2c3b42a1 |
415 | # Can't have just eval { &$name } || -1 because some LOG_XXX may be zero. |
108be7fb |
416 | my $value = eval { no strict 'refs'; &$name }; |
2c3b42a1 |
417 | defined $value ? $value : -1; |
a0d0e21e |
418 | } |
419 | |
420 | sub connect { |
23642f4b |
421 | @fallbackMethods = @connectMethods unless (scalar @fallbackMethods); |
422 | if ($transmit_ok && $current_proto) { |
423 | # Retry what we were on, because it's worked in the past. |
424 | unshift(@fallbackMethods, $current_proto); |
425 | } |
426 | $connected = 0; |
427 | my @errs = (); |
428 | my $proto = undef; |
429 | while ($proto = shift(@fallbackMethods)) { |
108be7fb |
430 | no strict 'refs'; |
23642f4b |
431 | my $fn = "connect_$proto"; |
108be7fb |
432 | $connected = &$fn(\@errs) if defined &$fn; |
23642f4b |
433 | last if ($connected); |
434 | } |
435 | |
436 | $transmit_ok = 0; |
437 | if ($connected) { |
60b8437d |
438 | $current_proto = $proto; |
108be7fb |
439 | my($old) = select(SYSLOG); $| = 1; select($old); |
23642f4b |
440 | } else { |
441 | @fallbackMethods = (); |
442 | foreach my $err (@errs) { |
443 | carp $err; |
444 | } |
445 | croak "no connection to syslog available"; |
446 | } |
447 | } |
448 | |
449 | sub connect_tcp { |
450 | my ($errs) = @_; |
451 | unless ($host) { |
452 | require Sys::Hostname; |
453 | my($host_uniq) = Sys::Hostname::hostname(); |
454 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
455 | } |
456 | my $tcp = getprotobyname('tcp'); |
457 | if (!defined $tcp) { |
458 | push(@{$errs}, "getprotobyname failed for tcp"); |
459 | return 0; |
460 | } |
461 | my $syslog = getservbyname('syslog','tcp'); |
462 | $syslog = getservbyname('syslogng','tcp') unless (defined $syslog); |
463 | if (!defined $syslog) { |
464 | push(@{$errs}, "getservbyname failed for tcp"); |
465 | return 0; |
466 | } |
467 | |
468 | my $this = sockaddr_in($syslog, INADDR_ANY); |
469 | my $that = sockaddr_in($syslog, inet_aton($host)); |
470 | if (!$that) { |
471 | push(@{$errs}, "can't lookup $host"); |
472 | return 0; |
473 | } |
474 | if (!socket(SYSLOG,AF_INET,SOCK_STREAM,$tcp)) { |
475 | push(@{$errs}, "tcp socket: $!"); |
476 | return 0; |
477 | } |
478 | setsockopt(SYSLOG, SOL_SOCKET, SO_KEEPALIVE, 1); |
479 | setsockopt(SYSLOG, IPPROTO_TCP, TCP_NODELAY, 1); |
60b8437d |
480 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
481 | push(@{$errs}, "tcp connect: $!"); |
482 | return 0; |
483 | } |
484 | $syslog_send = \&_syslog_send_socket; |
485 | return 1; |
486 | } |
487 | |
488 | sub connect_udp { |
489 | my ($errs) = @_; |
4fc7577b |
490 | unless ($host) { |
491 | require Sys::Hostname; |
2eae817d |
492 | my($host_uniq) = Sys::Hostname::hostname(); |
3e3baf6d |
493 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
4fc7577b |
494 | } |
23642f4b |
495 | my $udp = getprotobyname('udp'); |
496 | if (!defined $udp) { |
497 | push(@{$errs}, "getprotobyname failed for udp"); |
498 | return 0; |
499 | } |
500 | my $syslog = getservbyname('syslog','udp'); |
501 | if (!defined $syslog) { |
502 | push(@{$errs}, "getservbyname failed for udp"); |
503 | return 0; |
504 | } |
505 | my $this = sockaddr_in($syslog, INADDR_ANY); |
506 | my $that = sockaddr_in($syslog, inet_aton($host)); |
507 | if (!$that) { |
508 | push(@{$errs}, "can't lookup $host"); |
509 | return 0; |
510 | } |
511 | if (!socket(SYSLOG,AF_INET,SOCK_DGRAM,$udp)) { |
512 | push(@{$errs}, "udp socket: $!"); |
513 | return 0; |
514 | } |
60b8437d |
515 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
516 | push(@{$errs}, "udp connect: $!"); |
517 | return 0; |
518 | } |
519 | # We want to check that the UDP connect worked. However the only |
520 | # way to do that is to send a message and see if an ICMP is returned |
521 | _syslog_send_socket(""); |
522 | if (!connection_ok()) { |
523 | push(@{$errs}, "udp connect: nobody listening"); |
524 | return 0; |
525 | } |
526 | $syslog_send = \&_syslog_send_socket; |
527 | return 1; |
528 | } |
529 | |
530 | sub connect_stream { |
531 | my ($errs) = @_; |
532 | # might want syslog_path to be variable based on syslog.h (if only |
533 | # it were in there!) |
534 | $syslog_path = '/dev/conslog'; |
535 | if (!-w $syslog_path) { |
536 | push(@{$errs}, "stream $syslog_path is not writable"); |
537 | return 0; |
538 | } |
539 | if (!open(SYSLOG, ">" . $syslog_path)) { |
540 | push(@{$errs}, "stream can't open $syslog_path: $!"); |
541 | return 0; |
542 | } |
543 | $syslog_send = \&_syslog_send_stream; |
544 | return 1; |
545 | } |
546 | |
547 | sub connect_unix { |
548 | my ($errs) = @_; |
549 | if (length _PATH_LOG()) { |
550 | $syslog_path = _PATH_LOG(); |
cb63fe9d |
551 | } else { |
23642f4b |
552 | push(@{$errs}, "_PATH_LOG not available in syslog.h"); |
553 | return 0; |
554 | } |
555 | my $that = sockaddr_un($syslog_path); |
556 | if (!$that) { |
557 | push(@{$errs}, "can't locate $syslog_path"); |
558 | return 0; |
559 | } |
560 | if (!socket(SYSLOG,AF_UNIX,SOCK_STREAM,0)) { |
561 | push(@{$errs}, "unix stream socket: $!"); |
562 | return 0; |
563 | } |
60b8437d |
564 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
565 | if (!socket(SYSLOG,AF_UNIX,SOCK_DGRAM,0)) { |
566 | push(@{$errs}, "unix dgram socket: $!"); |
567 | return 0; |
568 | } |
60b8437d |
569 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
570 | push(@{$errs}, "unix dgram connect: $!"); |
571 | return 0; |
572 | } |
cb63fe9d |
573 | } |
23642f4b |
574 | $syslog_send = \&_syslog_send_socket; |
575 | return 1; |
576 | } |
577 | |
578 | sub connect_console { |
579 | my ($errs) = @_; |
580 | if (!-w '/dev/console') { |
581 | push(@{$errs}, "console is not writable"); |
582 | return 0; |
583 | } |
584 | $syslog_send = \&_syslog_send_console; |
585 | return 1; |
586 | } |
587 | |
588 | # to test if the connection is still good, we need to check if any |
589 | # errors are present on the connection. The errors will not be raised |
590 | # by a write. Instead, sockets are made readable and the next read |
591 | # would cause the error to be returned. Unfortunately the syslog |
592 | # 'protocol' never provides anything for us to read. But with |
593 | # judicious use of select(), we can see if it would be readable... |
594 | sub connection_ok { |
dbfdd438 |
595 | return 1 if (defined $current_proto && $current_proto eq 'console'); |
23642f4b |
596 | my $rin = ''; |
597 | vec($rin, fileno(SYSLOG), 1) = 1; |
598 | my $ret = select $rin, undef, $rin, 0; |
599 | return ($ret ? 0 : 1); |
a0d0e21e |
600 | } |
601 | |
602 | sub disconnect { |
603 | close SYSLOG; |
604 | $connected = 0; |
23642f4b |
605 | $syslog_send = undef; |
a0d0e21e |
606 | } |
607 | |
608 | 1; |