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|
#!/usr/bin/perl
# rpm helper scriptlet to add a syslog entry (sysklogd and syslog-ng)
# $Id$
use Getopt::Std;
use strict;
my %opts = (
s => '/dev/log',
f => undef,
m => 'debug',
M => 'emerg'
);
getopts('s:f:m:M:', \%opts);
my ($source, $facility, $min, $max) = @opts{qw/s f m M/};
die <<EOF if @ARGV < 3;
usage: $0 [options] <pkg> <nb> <dest>
Available options:
-s <source> source (default: /dev/log)
-f <facility> facility (default: first local available)
-m <priority> min priority (default: debug)
-M <priority> max priority (default: emerg)
EOF
my ($package, $number, $dest) = @ARGV;
# don't do anything for upgrade
exit(0) if $number == 2;
# check arguments
my @facilities = qw/auth authpriv cron daemon \
kern lpr mail mark news syslog \
user uucp local0 local1 local2 \
local3 local4 local5 local6 local7/;
my %facilities = map { $_ => 1 } @facilities;
die "invalid facility '$facility'" if $facility && !$facilities{$facility};
my $i;
my @priorities = qw/debug info notice warning err crit alert emerg/;
my %priorities = map { $_ => $i++ } @priorities;
die "invalid min priority '$min'" if $min && ! defined $priorities{$min};
die "invalid max priority '$max'" if $max && ! defined $priorities{$max};
die "maximum priority '$max' lower than minimum priority '$min'"
if $min && $max && ($priorities{$max} < $priorities{$min});
if (!$facility) {
my @local_facilities;
# parse all configuration files, and count occurences of local facilities
if (-f '/etc/syslog.conf') {
open(my $in, '<', '/etc/syslog.conf')
or die "Can't open /etc/syslog.conf for reading: $!";
while (my $line = <$in>) {
$local_facilities[$1]++ if $line =~ /^local(\d)/;
}
close($in);
}
if (-f '/etc/syslog-ng.conf') {
open(my $in, '<', '/etc/syslog-ng.conf')
or die "Can't open /etc/syslog-ng.conf for reading: $!";
while (my $line = <$in>) {
$local_facilities[$1]++ if $line =~ /facility\(local(\d)\)/;
}
close($in);
}
# use first facility without occurences
for my $i (1 .. 7) {
next unless $local_facilities[$i] == 0;
$facility = "local$i";
last;
}
die "no available free facility" unless $facility;
}
add_sysklogd_entry($package, $source, $dest, $facility, $min, $max)
if -f '/etc/syslog.conf';
add_syslogng_entry($package, $source, $dest, $facility, $min, $max)
if -f '/etc/syslog-ng.conf';
# output used facility as feedback
print $facility;
sub add_sysklogd_entry {
my ($package, $source, $dest, $facility, $min, $max) = @_;
# ensure source is configured
if ($source ne '/dev/log') {
my ($content, $changed);
open(my $in, '<', '/etc/sysconfig/syslog')
or die "Can't open /etc/sysconfig/syslog for reading: $!";
while (my $line = <$in>) {
if ($line =~ /^SYSLOGD_OPTIONS=(["'])?(.*)\1/) {
my $quote = $1;
my $options = $2;
if ($options !~ /-a\s+$source/) {
$options .= " -a $source";
$changed = 1;
}
$content .=
"SYSLOGD_OPTIONS=" . $quote . $options. $quote . "\n";
} else {
$content .= $line;
}
}
close($in);
if ($changed) {
open(my $out, '>', '/etc/sysconfig/syslog')
or die "Can't open /etc/sysconfig/syslog for writing: $!";
print $out $content;
close($out);
}
}
# compute selector
my $selector;
if ($max eq 'emerg') {
if ($min eq 'debug') {
$selector = "$facility.*";
} else {
$selector = "$facility.$min";
}
} else {
for my $i ($priorities{$min} .. $priorities{$max}) {
$selector .= ';' if $selector;
$selector .= "$facility.=$priorities[$i]";
}
}
# compute spacing to keep default configuration file formatting
my $tabs = length($selector) < 48 ?
((48 - length($selector)) / 8) :
1;
# append entry
open(my $out, '>>', '/etc/syslog.conf')
or die "Can't open /etc/syslog.conf for appending: $!";
print $out "# BEGIN: Automatically added by $package installation\n";
print $out $selector . ("\t" x $tabs) . '-' . $dest . "\n";
print $out "# END\n";
close($out);
# relaunch syslog
system('service syslog condrestart 2>&1 >/dev/null');
}
sub add_syslogng_entry {
my ($package, $source, $dest, $facility, $min, $max) = @_;
# read it first to check its content
my ($source_id, $destination_id, $facility_id, $level_id);
my $level = $min eq $max ? $max : "$min..$max";
open(my $fh, '<', '/etc/syslog-ng.conf')
or die "Can't open /etc/syslog-ng.conf for reading: $!";
while (my $line = <$fh>) {
if ($line =~ /^source \s+ (\S+) \s+ {/x) {
# source block
my $id = $1;
SOURCE:
while (1) {
if ($line =~ /(?:unix-stream|file) \s* \( (["']) ([^\1]+) \1/x) {
my $value = $2;
$source_id = $id if $source eq $value;
}
last SOURCE if $line =~ /};/;
$line = <$fh>;
last SOURCE if !$line;
}
} elsif ($line =~ /^destination \s+ (\S+) \s+ {/x) {
# destination block
my $id = $1;
DESTINATION:
while (1) {
if ($line =~ /file \s* \( (["']) ([^\1]+) \1/x) {
my $value = $2;
$destination_id = $id if $dest eq $value;
}
last DESTINATION if $line =~ /};/;
$line = <$fh>;
last DESTINATION if !$line;
}
} elsif ($line =~ /^filter \s+ (\S+) \s+ {/x) {
# filter block
my $id = $1;
FILTER:
while (1) {
if ($line =~ /facility \s* \( ([^)]+) \)/x) {
my $value = $1;
$facility_id = $id if $facility eq $value;
}
if ($line =~ /level \s* \( ([^)]+) \)/x) {
my $value = $1;
$level_id = $id if $level eq $value;
}
last FILTER if $line =~ /};/;
$line = <$fh>;
last FILTER if !$line;
}
}
}
close($fh);
# then append what is needed
open(my $out, '>>', '/etc/syslog-ng.conf')
or die "Can't open /etc/syslog-ng.conf for appending: $!";
print $out "# BEGIN: Automatically added by $package installation\n";
if (!$source_id) {
$source_id = 's_' . $package;
print $out "source $source_id { unix-stream('$source'); };\n";
}
if (!$destination_id) {
$destination_id = 'd_' . $package;
print $out "destination $destination_id { file('$dest'); };\n";
}
if (!$facility_id) {
$facility_id = 'f_facility_' . $package;
print $out "filter $facility_id { facility($facility); };\n";
}
if (!$level_id) {
$level_id = 'f_level_' . $package;
print $out "filter $level_id { level($level); };\n";
}
print $out "log { source($source_id);" .
" filter($facility_id);" .
" filter($level_id);" .
" destination($destination_id); };\n";
print $out "# END\n";
close($out);
# relaunch syslog-ng
system('service syslog-ng condrestart 2>&1 >/dev/null');
}
|
