skip processes that are in a different pid namespace

this is turned off by default and can be enabled by --ignore-pid-namespaces

Signed-off-by: Peter Palfrader <peter@palfrader.org>

diff --git a/dsa-nagios-checks/checks/dsa-check-libs b/dsa-nagios-checks/checks/dsa-check-libs
index fd9e338..da26cdc 100755 (executable)
--- a/dsa-nagios-checks/checks/dsa-check-libs
+++ b/dsa-nagios-checks/checks/dsa-check-libs
@@ -52,16 +52,18 @@ if (!GetOptions (
        '--help'        => \$params->{'help'},
        '--version'     => \$params->{'version'},
        '--quiet'       => \$params->{'quiet'},
+       '--ignore-pid-namespaces'       => \$params->{'ignore_pid_namespaces'},
        '--verbose'     => \$params->{'verbose'},
        '-v'            => \$params->{'verbose'},
        '--config=s'    => \$params->{'config'},
        )) {
-       dief ("$PROGRAM_NAME: Usage: $PROGRAM_NAME [--help|--version] [--verbose] [--quiet] [--config=<CONFIGFILE>]\n");
+       dief ("$PROGRAM_NAME: Usage: $PROGRAM_NAME [--help|--version] [--ignore-pid-namespaces] [--verbose] [--quiet] [--config=<CONFIGFILE>]\n");
 };
 if ($params->{'help'}) {
-       print "$PROGRAM_NAME: Usage: $PROGRAM_NAME [--help|--version] [--verbose] [--quiet] [--config=<CONFIGFILE>]\n";
+       print "$PROGRAM_NAME: Usage: $PROGRAM_NAME [--help|--version] [--ignore-pid-namespaces] [--verbose] [--quiet] [--config=<CONFIGFILE>]\n";
        print "Reports processes that are linked against libraries that no longer exist.\n";
        print "The optional config file can specify ignore rules - see the sample config file.\n";
+       print "Can optionally ignore processes from other PID namespaces.\n";
        exit (0);
 };
 if ($params->{'version'}) {
@@ -142,6 +144,12 @@ sub inVserver() {
 
 my $INVSERVER = inVserver();
 
+my $PID_NS_SUPPORT = (-f '/proc/self/ns/pid');
+my $PID_NS;
+if ($PID_NS_SUPPORT and $params->{'ignore_pid_namespaces'}) {
+       $PID_NS = readlink('/proc/self/ns/pid');
+}
+
 print STDERR "Running $LSOF -n\n" if $params->{'verbose'};
 open (LSOF, "$LSOF -n 2>/dev/null|") or dief ("Cannot run $LSOF -n: $!\n");
 my @lsof=<LSOF>;
@@ -160,6 +168,11 @@ LINE: for my $line (@lsof)  {
                next;
        }
 
+       if ($PID_NS_SUPPORT and $params->{'ignore_pid_namespaces'}) {
+               my $pidns = readlink('/proc/'.$pid.'/ns/pid');
+               next if (defined $pidns and $PID_NS ne $pidns);
+       }
+
        unless ( $line =~ /^f/ ) {
                dief("UNKNOWN strange line read from lsof\n");
                # don't print it because it contains NULL characters...