=head1 NAME
Mail::SpamAssassin::Logger::Syslog - log to syslog
=head1 SYNOPSIS
loadplugin Mail::SpamAssassin::Logger::Syslog
=head1 DESCRIPTION
=cut
package Mail::SpamAssassin::Logger::Syslog;
use strict;
use warnings;
use bytes;
use Mail::SpamAssassin::Logger;
use Sys::Syslog qw(:DEFAULT setlogsock);
use POSIX qw(:sys_wait_h);
use POSIX qw(setsid sigprocmask);
use vars qw(@ISA);
@ISA = ();
sub new {
my $class = shift;
$class = ref($class) || $class;
my $self = { };
bless ($self, $class);
$self->{already_done_failure_warning} = 0;
$self->{disabled} = 0;
$self->{consecutive_failures} = 0;
$self->{failure_threshold} = 10;
my %params = @_;
$self->{ident} = $params{ident} || 'spamassassin';
$self->{log_socket} = $params{socket};
$self->{log_facility} = $params{facility};
if (! $self->init()) {
die "logger: syslog initialization failed\n";
}
return($self);
}
sub init {
my ($self) = @_;
my $log_socket = $self->{log_socket};
dbg("logger: trying to connect to syslog/${log_socket}...\n");
eval {
defined(setlogsock($log_socket)) || die "logger: $!";
dbg("logger: opening syslog with $log_socket socket");
openlog($self->{ident}, 'cons,pid,ndelay', $self->{log_facility});
};
my $err = $@;
chomp($err);
if ($err and $log_socket ne 'inet') {
dbg("logger: connection to syslog/${log_socket} failed: $err\n"
. "trying to connect to syslog/inet...");
eval {
defined(setlogsock('inet')) || die "logger: $!";
dbg("logger: failed to setlogsock(${log_socket}): $err");
dbg("logger: opening syslog using inet socket");
openlog($self->{ident}, 'cons,pid,ndelay', $self->{log_facility});
};
}
if ($@) {
return 0;
}
else {
dbg("logger: successfully connected to syslog/${log_socket}");
return 1;
}
}
sub log_message {
my ($self, $level, $msg) = @_;
return if $self->{disabled};
$level = 'debug' if $level eq 'dbg';
$level = 'warning' if $level eq 'warn';
$level = 'err' if $level eq 'error';
local $SIG{'PIPE'} = sub {
$self->{SIGPIPE_RECEIVED}++;
eval { closelog(); };
};
$Mail::SpamAssassin::Logger::LOG_SA{INHIBIT_LOGGING_IN_SIGCHLD_HANDLER} = 1;
eval { syslog($level, "%s", $msg); };
$Mail::SpamAssassin::Logger::LOG_SA{INHIBIT_LOGGING_IN_SIGCHLD_HANDLER} = 0;
if ($@) {
if ($self->check_syslog_sigpipe($msg)) {
}
else {
warn "logger: syslog failed: $@";
if (!$self->{already_done_failure_warning}) {
warn "logger: try using --syslog-socket={unix,inet} or --syslog=file\n";
$self->{already_done_failure_warning} = 1;
}
}
$self->syslog_incr_failure_counter();
}
else {
$self->{consecutive_failures} = 0;
$self->check_syslog_sigpipe($msg); }
$SIG{PIPE} = 'IGNORE'; }
sub check_syslog_sigpipe {
my ($self, $msg) = @_;
if (!$self->{SIGPIPE_RECEIVED}) {
return 0; }
eval {
closelog();
openlog($self->{ident}, 'cons,pid,ndelay', $self->{log_facility});
syslog('debug', "%s", "syslog reopened");
syslog('info', "%s", $msg);
$msg = "SIGPIPE received, reopening log socket";
dbg("log: $msg");
syslog('info', "%s", $msg);
if ($self->{SIGPIPE_RECEIVED} > 1) {
warn "logger: syslog failure: multiple SIGPIPEs received\n";
$self->{disabled} = 1;
}
$self->{SIGPIPE_RECEIVED} = 0;
return 1;
};
if ($@) { $self->syslog_incr_failure_counter();
}
}
sub syslog_incr_failure_counter {
my ($self) = @_;
$self->{consecutive_failures}++;
if ($self->{consecutive_failures}++ > $self->{failure_threshold}) {
warn("logger: syslog() failed " . $self->{consecutive_failures} .
" times in a row, disabled\n");
$self->{disabled} = 1;
return 1;
}
return 0;
}
sub close_log {
my ($self) = @_;
closelog();
}
1;