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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 | |
9903e4c8 |
80 | Note that Sys::Syslog version v0.07 and older passed the $message as |
81 | the formatting string to sprintf() even when no formatting arguments |
29d14c72 |
82 | were provided. If the code calling syslog() might execute with older |
9903e4c8 |
83 | versions of this module, make sure to call the function as |
84 | syslog($priority, "%s", $message) instead of syslog($priority, |
85 | $message). This protects against hostile formatting sequences that |
86 | might show up if $message contains tainted data. |
87 | |
5be1dfc7 |
88 | =item setlogmask $mask_priority |
89 | |
90 | Sets log mask I<$mask_priority> and returns the old mask. |
91 | |
23642f4b |
92 | =item setlogsock $sock_type [$stream_location] (added in 5.004_02) |
3ffabb8c |
93 | |
cb63fe9d |
94 | Sets the socket type to be used for the next call to |
3ffabb8c |
95 | C<openlog()> or C<syslog()> and returns TRUE on success, |
96 | undef on failure. |
97 | |
f66a7beb |
98 | A value of 'unix' will connect to the UNIX domain socket (in some |
99 | systems a character special device) returned by the C<_PATH_LOG> macro |
100 | (if your system defines it), or F</dev/log> or F</dev/conslog>, |
101 | whatever is writable. A value of 'stream' will connect to the stream |
102 | indicated by the pathname provided as the optional second parameter. |
e9aaaa2f |
103 | (For example Solaris and IRIX require 'stream' instead of 'unix'.) |
f66a7beb |
104 | A value of 'inet' will connect to an INET socket (either tcp or udp, |
105 | tried in that order) returned by getservbyname(). 'tcp' and 'udp' can |
106 | also be given as values. The value 'console' will send messages |
107 | directly to the console, as for the 'cons' option in the logopts in |
108 | openlog(). |
23642f4b |
109 | |
110 | A reference to an array can also be passed as the first parameter. |
111 | When this calling method is used, the array should contain a list of |
112 | sock_types which are attempted in order. |
cb63fe9d |
113 | |
23642f4b |
114 | The default is to try tcp, udp, unix, stream, console. |
115 | |
116 | Giving an invalid value for sock_type will croak. |
cb63fe9d |
117 | |
5be1dfc7 |
118 | =item closelog |
119 | |
120 | Closes the log file. |
121 | |
122 | =back |
123 | |
124 | Note that C<openlog> now takes three arguments, just like C<openlog(3)>. |
125 | |
126 | =head1 EXAMPLES |
127 | |
128 | openlog($program, 'cons,pid', 'user'); |
e6c138cd |
129 | syslog('info', '%s', 'this is another test'); |
5be1dfc7 |
130 | syslog('mail|warning', 'this is a better test: %d', time); |
131 | closelog(); |
132 | |
133 | syslog('debug', 'this is the last test'); |
cb63fe9d |
134 | |
135 | setlogsock('unix'); |
5be1dfc7 |
136 | openlog("$program $$", 'ndelay', 'user'); |
137 | syslog('notice', 'fooprogram: this is really done'); |
138 | |
cb63fe9d |
139 | setlogsock('inet'); |
5be1dfc7 |
140 | $! = 55; |
141 | syslog('info', 'problem was %m'); # %m == $! in syslog(3) |
142 | |
476b65d9 |
143 | # Log to UDP port on $remotehost instead of logging locally |
144 | setlogsock('udp'); |
145 | $Sys::Syslog::host = $remotehost; |
146 | openlog($program, 'ndelay', 'user'); |
147 | syslog('info', 'something happened over here'); |
148 | |
5be1dfc7 |
149 | =head1 SEE ALSO |
150 | |
151 | L<syslog(3)> |
152 | |
153 | =head1 AUTHOR |
154 | |
150b260b |
155 | Tom Christiansen E<lt>F<tchrist@perl.com>E<gt> and Larry Wall |
156 | E<lt>F<larry@wall.org>E<gt>. |
157 | |
158 | UNIX domain sockets added by Sean Robinson |
23642f4b |
159 | E<lt>F<robinson_s@sc.maricopa.edu>E<gt> with support from Tim Bunce |
a88817a4 |
160 | E<lt>F<Tim.Bunce@ig.co.uk>E<gt> and the perl5-porters mailing list. |
150b260b |
161 | |
162 | Dependency on F<syslog.ph> replaced with XS code by Tom Hughes |
163 | E<lt>F<tom@compton.nu>E<gt>. |
5be1dfc7 |
164 | |
23642f4b |
165 | Code for constant()s regenerated by Nicholas Clark E<lt>F<nick@ccl4.org>E<gt>. |
166 | |
167 | Failover to different communication modes by Nick Williams |
168 | E<lt>F<Nick.Williams@morganstanley.com>E<gt>. |
b903fcff |
169 | |
5be1dfc7 |
170 | =cut |
a0d0e21e |
171 | |
8ce86de8 |
172 | sub AUTOLOAD { |
173 | # This AUTOLOAD is used to 'autoload' constants from the constant() |
174 | # XS function. |
23642f4b |
175 | |
8ce86de8 |
176 | my $constname; |
177 | our $AUTOLOAD; |
178 | ($constname = $AUTOLOAD) =~ s/.*:://; |
b903fcff |
179 | croak "&Sys::Syslog::constant not defined" if $constname eq 'constant'; |
180 | my ($error, $val) = constant($constname); |
181 | if ($error) { |
182 | croak $error; |
8ce86de8 |
183 | } |
108be7fb |
184 | no strict 'refs'; |
8ce86de8 |
185 | *$AUTOLOAD = sub { $val }; |
186 | goto &$AUTOLOAD; |
187 | } |
188 | |
db9f82cf |
189 | require XSLoader; |
190 | XSLoader::load('Sys::Syslog', $VERSION); |
a0d0e21e |
191 | |
108be7fb |
192 | our $maskpri = &LOG_UPTO(&LOG_DEBUG); |
a0d0e21e |
193 | |
194 | sub openlog { |
108be7fb |
195 | our ($ident, $logopt, $facility) = @_; # package vars |
196 | our $lo_pid = $logopt =~ /\bpid\b/; |
197 | our $lo_ndelay = $logopt =~ /\bndelay\b/; |
198 | our $lo_nowait = $logopt =~ /\bnowait\b/; |
a8710ca1 |
199 | return 1 unless $lo_ndelay; |
200 | &connect; |
a0d0e21e |
201 | } |
202 | |
203 | sub closelog { |
108be7fb |
204 | our $facility = our $ident = ''; |
a0d0e21e |
205 | &disconnect; |
206 | } |
207 | |
208 | sub setlogmask { |
108be7fb |
209 | my $oldmask = $maskpri; |
a0d0e21e |
210 | $maskpri = shift; |
211 | $oldmask; |
212 | } |
213 | |
cb63fe9d |
214 | sub setlogsock { |
108be7fb |
215 | my $setsock = shift; |
23642f4b |
216 | $syslog_path = shift; |
3ffabb8c |
217 | &disconnect if $connected; |
23642f4b |
218 | $transmit_ok = 0; |
219 | @fallbackMethods = (); |
220 | @connectMethods = @defaultMethods; |
221 | if (ref $setsock eq 'ARRAY') { |
222 | @connectMethods = @$setsock; |
223 | } elsif (lc($setsock) eq 'stream') { |
f66a7beb |
224 | unless (defined $syslog_path) { |
225 | my @try = qw(/dev/log /dev/conslog); |
e863979d |
226 | if (length &_PATH_LOG) { # Undefined _PATH_LOG is "". |
f66a7beb |
227 | unshift @try, &_PATH_LOG; |
228 | } |
229 | for my $try (@try) { |
230 | if (-w $try) { |
231 | $syslog_path = $try; |
232 | last; |
233 | } |
234 | } |
e863979d |
235 | carp "stream passed to setlogsock, but could not find any device" |
236 | unless defined $syslog_path; |
f66a7beb |
237 | } |
e863979d |
238 | unless (-w $syslog_path) { |
23642f4b |
239 | carp "stream passed to setlogsock, but $syslog_path is not writable"; |
240 | return undef; |
241 | } else { |
242 | @connectMethods = ( 'stream' ); |
243 | } |
244 | } elsif (lc($setsock) eq 'unix') { |
245 | if (length _PATH_LOG() && !defined $syslog_path) { |
246 | $syslog_path = _PATH_LOG(); |
247 | @connectMethods = ( 'unix' ); |
3ffabb8c |
248 | } else { |
23642f4b |
249 | carp 'unix passed to setlogsock, but path not available'; |
250 | return undef; |
3ffabb8c |
251 | } |
23642f4b |
252 | } elsif (lc($setsock) eq 'tcp') { |
253 | if (getservbyname('syslog', 'tcp') || getservbyname('syslogng', 'tcp')) { |
254 | @connectMethods = ( 'tcp' ); |
255 | } else { |
256 | carp "tcp passed to setlogsock, but tcp service unavailable"; |
257 | return undef; |
258 | } |
259 | } elsif (lc($setsock) eq 'udp') { |
260 | if (getservbyname('syslog', 'udp')) { |
261 | @connectMethods = ( 'udp' ); |
262 | } else { |
263 | carp "udp passed to setlogsock, but udp service unavailable"; |
264 | return undef; |
265 | } |
cb63fe9d |
266 | } elsif (lc($setsock) eq 'inet') { |
23642f4b |
267 | @connectMethods = ( 'tcp', 'udp' ); |
268 | } elsif (lc($setsock) eq 'console') { |
269 | @connectMethods = ( 'console' ); |
cb63fe9d |
270 | } else { |
23642f4b |
271 | carp "Invalid argument passed to setlogsock; must be 'stream', 'unix', 'tcp', 'udp' or 'inet'"; |
cb63fe9d |
272 | } |
f8b75b0c |
273 | return 1; |
cb63fe9d |
274 | } |
275 | |
a0d0e21e |
276 | sub syslog { |
108be7fb |
277 | my $priority = shift; |
278 | my $mask = shift; |
279 | my ($message, $whoami); |
280 | my (@words, $num, $numpri, $numfac, $sum); |
281 | our $facility; |
a0d0e21e |
282 | local($facility) = $facility; # may need to change temporarily. |
283 | |
78ac6fa8 |
284 | croak "syslog: expecting argument \$priority" unless $priority; |
285 | croak "syslog: expecting argument \$format" unless $mask; |
a0d0e21e |
286 | |
287 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility". |
288 | undef $numpri; |
289 | undef $numfac; |
290 | foreach (@words) { |
291 | $num = &xlate($_); # Translate word to number. |
292 | if (/^kern$/ || $num < 0) { |
293 | croak "syslog: invalid level/facility: $_"; |
294 | } |
295 | elsif ($num <= &LOG_PRIMASK) { |
296 | croak "syslog: too many levels given: $_" if defined($numpri); |
297 | $numpri = $num; |
298 | return 0 unless &LOG_MASK($numpri) & $maskpri; |
299 | } |
300 | else { |
301 | croak "syslog: too many facilities given: $_" if defined($numfac); |
302 | $facility = $_; |
303 | $numfac = $num; |
304 | } |
305 | } |
306 | |
307 | croak "syslog: level must be given" unless defined($numpri); |
308 | |
309 | if (!defined($numfac)) { # Facility not specified in this call. |
310 | $facility = 'user' unless $facility; |
311 | $numfac = &xlate($facility); |
312 | } |
313 | |
314 | &connect unless $connected; |
315 | |
108be7fb |
316 | $whoami = our $ident; |
a0d0e21e |
317 | |
5dad0344 |
318 | if (!$whoami && $mask =~ /^(\S.*?):\s?(.*)/) { |
a0d0e21e |
319 | $whoami = $1; |
320 | $mask = $2; |
321 | } |
322 | |
323 | unless ($whoami) { |
324 | ($whoami = getlogin) || |
325 | ($whoami = getpwuid($<)) || |
326 | ($whoami = 'syslog'); |
327 | } |
328 | |
108be7fb |
329 | $whoami .= "[$$]" if our $lo_pid; |
a0d0e21e |
330 | |
5007285b |
331 | if ($mask =~ /%m/) { |
332 | my $err = $!; |
333 | # escape percent signs if sprintf will be called |
334 | $err =~ s/%/%%/g if @_; |
335 | # replace %m with $err, if preceded by an even number of percent signs |
336 | $mask =~ s/(?<!%)((?:%%)*)%m/$1$err/g; |
337 | } |
338 | |
a0d0e21e |
339 | $mask .= "\n" unless $mask =~ /\n$/; |
ce43db9b |
340 | $message = @_ ? sprintf($mask, @_) : $mask; |
a0d0e21e |
341 | |
342 | $sum = $numpri + $numfac; |
23642f4b |
343 | my $buf = "<$sum>$whoami: $message\0"; |
344 | |
345 | # it's possible that we'll get an error from sending |
346 | # (e.g. if method is UDP and there is no UDP listener, |
347 | # then we'll get ECONNREFUSED on the send). So what we |
348 | # want to do at this point is to fallback onto a different |
349 | # connection method. |
350 | while (scalar @fallbackMethods || $syslog_send) { |
351 | if ($failed && (time - $fail_time) > 60) { |
352 | # it's been a while... maybe things have been fixed |
353 | @fallbackMethods = (); |
354 | disconnect(); |
355 | $transmit_ok = 0; # make it look like a fresh attempt |
356 | &connect; |
357 | } |
358 | if ($connected && !connection_ok()) { |
359 | # Something was OK, but has now broken. Remember coz we'll |
360 | # want to go back to what used to be OK. |
361 | $failed = $current_proto unless $failed; |
362 | $fail_time = time; |
363 | disconnect(); |
364 | } |
365 | &connect unless $connected; |
60b8437d |
366 | $failed = undef if ($current_proto && $failed && $current_proto eq $failed); |
23642f4b |
367 | if ($syslog_send) { |
368 | if (&{$syslog_send}($buf)) { |
369 | $transmit_ok++; |
370 | return 1; |
a0d0e21e |
371 | } |
23642f4b |
372 | # typically doesn't happen, since errors are rare from write(). |
373 | disconnect(); |
374 | } |
375 | } |
376 | # could not send, could not fallback onto a working |
377 | # connection method. Lose. |
378 | return 0; |
379 | } |
380 | |
381 | sub _syslog_send_console { |
382 | my ($buf) = @_; |
383 | chop($buf); # delete the NUL from the end |
384 | # The console print is a method which could block |
385 | # so we do it in a child process and always return success |
386 | # to the caller. |
387 | if (my $pid = fork) { |
108be7fb |
388 | our $lo_nowait; |
23642f4b |
389 | if ($lo_nowait) { |
390 | return 1; |
391 | } else { |
392 | if (waitpid($pid, 0) >= 0) { |
393 | return ($? >> 8); |
394 | } else { |
395 | # it's possible that the caller has other |
396 | # plans for SIGCHLD, so let's not interfere |
397 | return 1; |
a0d0e21e |
398 | } |
399 | } |
23642f4b |
400 | } else { |
401 | if (open(CONS, ">/dev/console")) { |
402 | my $ret = print CONS $buf . "\r"; |
403 | exit ($ret) if defined $pid; |
404 | close CONS; |
405 | } |
406 | exit if defined $pid; |
a0d0e21e |
407 | } |
408 | } |
409 | |
23642f4b |
410 | sub _syslog_send_stream { |
411 | my ($buf) = @_; |
412 | # XXX: this only works if the OS stream implementation makes a write |
413 | # look like a putmsg() with simple header. For instance it works on |
414 | # Solaris 8 but not Solaris 7. |
415 | # To be correct, it should use a STREAMS API, but perl doesn't have one. |
416 | return syswrite(SYSLOG, $buf, length($buf)); |
417 | } |
418 | sub _syslog_send_socket { |
419 | my ($buf) = @_; |
420 | return syswrite(SYSLOG, $buf, length($buf)); |
421 | #return send(SYSLOG, $buf, 0); |
422 | } |
423 | |
a0d0e21e |
424 | sub xlate { |
108be7fb |
425 | my($name) = @_; |
b9f13614 |
426 | return $name+0 if $name =~ /^\s*\d+\s*$/; |
55497cff |
427 | $name = uc $name; |
a0d0e21e |
428 | $name = "LOG_$name" unless $name =~ /^LOG_/; |
748a9306 |
429 | $name = "Sys::Syslog::$name"; |
2c3b42a1 |
430 | # Can't have just eval { &$name } || -1 because some LOG_XXX may be zero. |
108be7fb |
431 | my $value = eval { no strict 'refs'; &$name }; |
2c3b42a1 |
432 | defined $value ? $value : -1; |
a0d0e21e |
433 | } |
434 | |
435 | sub connect { |
23642f4b |
436 | @fallbackMethods = @connectMethods unless (scalar @fallbackMethods); |
437 | if ($transmit_ok && $current_proto) { |
438 | # Retry what we were on, because it's worked in the past. |
439 | unshift(@fallbackMethods, $current_proto); |
440 | } |
441 | $connected = 0; |
442 | my @errs = (); |
443 | my $proto = undef; |
444 | while ($proto = shift(@fallbackMethods)) { |
108be7fb |
445 | no strict 'refs'; |
23642f4b |
446 | my $fn = "connect_$proto"; |
108be7fb |
447 | $connected = &$fn(\@errs) if defined &$fn; |
23642f4b |
448 | last if ($connected); |
449 | } |
450 | |
451 | $transmit_ok = 0; |
452 | if ($connected) { |
60b8437d |
453 | $current_proto = $proto; |
108be7fb |
454 | my($old) = select(SYSLOG); $| = 1; select($old); |
23642f4b |
455 | } else { |
456 | @fallbackMethods = (); |
457 | foreach my $err (@errs) { |
458 | carp $err; |
459 | } |
460 | croak "no connection to syslog available"; |
461 | } |
462 | } |
463 | |
464 | sub connect_tcp { |
465 | my ($errs) = @_; |
466 | unless ($host) { |
467 | require Sys::Hostname; |
468 | my($host_uniq) = Sys::Hostname::hostname(); |
469 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
470 | } |
471 | my $tcp = getprotobyname('tcp'); |
472 | if (!defined $tcp) { |
473 | push(@{$errs}, "getprotobyname failed for tcp"); |
474 | return 0; |
475 | } |
476 | my $syslog = getservbyname('syslog','tcp'); |
477 | $syslog = getservbyname('syslogng','tcp') unless (defined $syslog); |
478 | if (!defined $syslog) { |
479 | push(@{$errs}, "getservbyname failed for tcp"); |
480 | return 0; |
481 | } |
482 | |
483 | my $this = sockaddr_in($syslog, INADDR_ANY); |
484 | my $that = sockaddr_in($syslog, inet_aton($host)); |
485 | if (!$that) { |
486 | push(@{$errs}, "can't lookup $host"); |
487 | return 0; |
488 | } |
489 | if (!socket(SYSLOG,AF_INET,SOCK_STREAM,$tcp)) { |
490 | push(@{$errs}, "tcp socket: $!"); |
491 | return 0; |
492 | } |
493 | setsockopt(SYSLOG, SOL_SOCKET, SO_KEEPALIVE, 1); |
494 | setsockopt(SYSLOG, IPPROTO_TCP, TCP_NODELAY, 1); |
60b8437d |
495 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
496 | push(@{$errs}, "tcp connect: $!"); |
497 | return 0; |
498 | } |
499 | $syslog_send = \&_syslog_send_socket; |
500 | return 1; |
501 | } |
502 | |
503 | sub connect_udp { |
504 | my ($errs) = @_; |
4fc7577b |
505 | unless ($host) { |
506 | require Sys::Hostname; |
2eae817d |
507 | my($host_uniq) = Sys::Hostname::hostname(); |
3e3baf6d |
508 | ($host) = $host_uniq =~ /([A-Za-z0-9_.-]+)/; # allow FQDN (inc _) |
4fc7577b |
509 | } |
23642f4b |
510 | my $udp = getprotobyname('udp'); |
511 | if (!defined $udp) { |
512 | push(@{$errs}, "getprotobyname failed for udp"); |
513 | return 0; |
514 | } |
515 | my $syslog = getservbyname('syslog','udp'); |
516 | if (!defined $syslog) { |
517 | push(@{$errs}, "getservbyname failed for udp"); |
518 | return 0; |
519 | } |
520 | my $this = sockaddr_in($syslog, INADDR_ANY); |
521 | my $that = sockaddr_in($syslog, inet_aton($host)); |
522 | if (!$that) { |
523 | push(@{$errs}, "can't lookup $host"); |
524 | return 0; |
525 | } |
526 | if (!socket(SYSLOG,AF_INET,SOCK_DGRAM,$udp)) { |
527 | push(@{$errs}, "udp socket: $!"); |
528 | return 0; |
529 | } |
60b8437d |
530 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
531 | push(@{$errs}, "udp connect: $!"); |
532 | return 0; |
533 | } |
534 | # We want to check that the UDP connect worked. However the only |
535 | # way to do that is to send a message and see if an ICMP is returned |
536 | _syslog_send_socket(""); |
537 | if (!connection_ok()) { |
538 | push(@{$errs}, "udp connect: nobody listening"); |
539 | return 0; |
540 | } |
541 | $syslog_send = \&_syslog_send_socket; |
542 | return 1; |
543 | } |
544 | |
545 | sub connect_stream { |
546 | my ($errs) = @_; |
547 | # might want syslog_path to be variable based on syslog.h (if only |
548 | # it were in there!) |
549 | $syslog_path = '/dev/conslog'; |
550 | if (!-w $syslog_path) { |
551 | push(@{$errs}, "stream $syslog_path is not writable"); |
552 | return 0; |
553 | } |
554 | if (!open(SYSLOG, ">" . $syslog_path)) { |
555 | push(@{$errs}, "stream can't open $syslog_path: $!"); |
556 | return 0; |
557 | } |
558 | $syslog_send = \&_syslog_send_stream; |
559 | return 1; |
560 | } |
561 | |
562 | sub connect_unix { |
563 | my ($errs) = @_; |
564 | if (length _PATH_LOG()) { |
565 | $syslog_path = _PATH_LOG(); |
cb63fe9d |
566 | } else { |
23642f4b |
567 | push(@{$errs}, "_PATH_LOG not available in syslog.h"); |
568 | return 0; |
569 | } |
570 | my $that = sockaddr_un($syslog_path); |
571 | if (!$that) { |
572 | push(@{$errs}, "can't locate $syslog_path"); |
573 | return 0; |
574 | } |
575 | if (!socket(SYSLOG,AF_UNIX,SOCK_STREAM,0)) { |
576 | push(@{$errs}, "unix stream socket: $!"); |
577 | return 0; |
578 | } |
60b8437d |
579 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
580 | if (!socket(SYSLOG,AF_UNIX,SOCK_DGRAM,0)) { |
581 | push(@{$errs}, "unix dgram socket: $!"); |
582 | return 0; |
583 | } |
60b8437d |
584 | if (!CORE::connect(SYSLOG,$that)) { |
23642f4b |
585 | push(@{$errs}, "unix dgram connect: $!"); |
586 | return 0; |
587 | } |
cb63fe9d |
588 | } |
23642f4b |
589 | $syslog_send = \&_syslog_send_socket; |
590 | return 1; |
591 | } |
592 | |
593 | sub connect_console { |
594 | my ($errs) = @_; |
595 | if (!-w '/dev/console') { |
596 | push(@{$errs}, "console is not writable"); |
597 | return 0; |
598 | } |
599 | $syslog_send = \&_syslog_send_console; |
600 | return 1; |
601 | } |
602 | |
603 | # to test if the connection is still good, we need to check if any |
604 | # errors are present on the connection. The errors will not be raised |
605 | # by a write. Instead, sockets are made readable and the next read |
606 | # would cause the error to be returned. Unfortunately the syslog |
607 | # 'protocol' never provides anything for us to read. But with |
608 | # judicious use of select(), we can see if it would be readable... |
609 | sub connection_ok { |
dbfdd438 |
610 | return 1 if (defined $current_proto && $current_proto eq 'console'); |
23642f4b |
611 | my $rin = ''; |
612 | vec($rin, fileno(SYSLOG), 1) = 1; |
613 | my $ret = select $rin, undef, $rin, 0; |
614 | return ($ret ? 0 : 1); |
a0d0e21e |
615 | } |
616 | |
617 | sub disconnect { |
618 | close SYSLOG; |
619 | $connected = 0; |
23642f4b |
620 | $syslog_send = undef; |
a0d0e21e |
621 | } |
622 | |
623 | 1; |