Fixed SNMPv3 behaviour of check_ifstatus. Added -P to define privprotocol (#2343438 - Robin Schroeder)

check_ifstatus didn't function correctly with SNMPv3. This is fixed now.
Created argument-hash for SNMP session creation. This removes redundant code.
Session creation was moved out of process_arguments() and now takes place
after setting the timeout handler.

Additionally the -P argument was added to specify the privprotocol.

2 files changed, 130 insertions, 103 deletions

diff --git a/plugins-scripts/check_ifstatus.pl b/plugins-scripts/check_ifstatus.pl
index bae3ffa..2263823 100755
--- a/plugins-scripts/check_ifstatus.pl
+++ b/plugins-scripts/check_ifstatus.pl
@@ -42,7 +42,8 @@ Getopt::Long::Configure('bundling');
 my $PROGNAME = "check_ifstatus";
 
 sub print_help ();
-sub usage ();
+sub usage ($);
+sub print_usage ();
 sub process_arguments ();
 
 
@@ -63,7 +64,7 @@ my $snmpoid=0;
 my $key=0;
 my $community = "public";
 my $maxmsgsize = 1472 ; # Net::SNMP default is 1472
-my ($seclevel, $authproto, $secname, $authpass, $privpass, $auth, $priv, $context);
+my ($seclevel, $authproto, $secname, $authpass, $privpass, $privproto, $auth, $priv, $context);
 my $port = 161;
 my @snmpoids;
 my $snmpIfAdminStatus = '1.3.6.1.2.1.2.2.1.7';
@@ -92,6 +93,7 @@ my $opt_u;
 my $opt_x ;
 my %excluded ;
 my @unused_ports ;
+my %session_opts;
 
 
 
@@ -115,6 +117,15 @@ if ($status != 0)
 
 
 alarm($timeout);
+($session, $error) = Net::SNMP->session(%session_opts);
+                
+if (!defined($session)) {
+                        $state='UNKNOWN';
+                        $answer=$error;
+                        print ("$state: $answer\n");
+                        exit $ERRORS{$state};
+}
+
 
 push(@snmpoids,$snmpIfOperStatus);
 push(@snmpoids,$snmpIfAdminStatus);
@@ -209,19 +220,25 @@ my $perfdata = sprintf("up=%d,down=%d,dormant=%d,excluded=%d,unused=%d",$ifup,$i
 print ("$state: $answer |$perfdata\n");
 exit $ERRORS{$state};
 
+sub usage($) {
+        print "$_[0]\n";
+        print_usage();
+        exit $ERRORS{"UNKNOWN"};
+}
 
-sub usage (){
-        printf "\nMissing arguments!\n";
+sub print_usage() {
         printf "\n";
+        printf "usage: \n";
         printf "check_ifstatus -C <READCOMMUNITY> -p <PORT> -H <HOSTNAME>\n";
         printf "Copyright (C) 2000 Christoph Kron\n";
         printf "Updates 5/2002 Subhendu Ghosh\n";
-        printf "\n\n";
         support();
-        exit $ERRORS{"UNKNOWN"};
+        printf "\n\n";
 }
 
-sub print_help (){
+sub print_help() {
+        print_revision($PROGNAME, '@NP_VERSION@');
+        print_usage();
         printf "check_ifstatus plugin for Nagios monitors operational \n";
         printf "status of each network interface on the target host\n";
         printf "\nUsage:\n";
@@ -242,14 +259,15 @@ sub print_help (){
         printf "                     See the IANAifType-MIB for a list of interface types.\n";
         printf "   -L (--seclevel)   choice of \"noAuthNoPriv\", \"authNoPriv\", or     \"authPriv\"\n";
         printf "   -U (--secname)    username for SNMPv3 context\n";
-        printf "   -c (--context)    SNMPv3 context name (default is empty      string)";
+        printf "   -c (--context)    SNMPv3 context name (default is empty string)\n";
         printf "   -A (--authpass)   authentication password (cleartext ascii or localized key\n";
-        printf "                     in hex with 0x prefix generated by using   \"snmpkey\" utility\n"; 
+        printf "                     in hex with 0x prefix generated by using \"snmpkey\" utility\n"; 
         printf "                     auth password and authEngineID\n";
-        printf "   -a (--authproto)  Authentication protocol ( MD5 or SHA1)\n";
+        printf "   -a (--authproto)  Authentication protocol (MD5 or SHA1)\n";
         printf "   -X (--privpass)   privacy password (cleartext ascii or localized key\n";
-        printf "                     in hex with 0x prefix generated by using   \"snmpkey\" utility\n"; 
+        printf "                     in hex with 0x prefix generated by using \"snmpkey\" utility\n"; 
         printf "                     privacy password and authEngineID\n";
+        printf "   -P (--privproto)  privacy protocol (DES or AES; default: DES)\n";
         printf "   -M (--maxmsgsize) Max message size - usefull only for v1 or v2c\n";
         printf "   -t (--timeout)    seconds before the plugin times out (default=$TIMEOUT)\n";
         printf "   -V (--version)    Plugin version\n";
@@ -269,6 +287,7 @@ sub process_arguments() {
                 "U=s" => \$secname,   "secname=s"   => \$secname,
                 "A=s" => \$authpass,  "authpass=s"  => \$authpass,
                 "X=s" => \$privpass,  "privpass=s"  => \$privpass,
+                "P=s" => \$privproto,  "privproto=s"  => \$privproto,
                 "c=s" => \$context,   "context=s"   => \$context,
                 "p=i" =>\$port, "port=i" => \$port,
                 "H=s" => \$hostname, "hostname=s" => \$hostname,
@@ -280,9 +299,10 @@ sub process_arguments() {
                 );
                 
         if ($status == 0){
-                print_help() ;
+                print_help();
                 exit $ERRORS{'OK'};
         }
+
         if ($opt_V) {
                 print_revision($PROGNAME,'@NP_VERSION@');
                 exit $ERRORS{'OK'};
@@ -297,68 +317,75 @@ sub process_arguments() {
                 $timeout = $TIMEOUT;
         }
 
+        if ($snmp_version !~ /[123]/){
+                $state='UNKNOWN';
+                print ("$state: No support for SNMP v$snmp_version yet\n");
+                exit $ERRORS{$state};
+        }
+
+        %session_opts = (
+                -hostname   => $hostname,
+                -port       => $port,
+                -version    => $snmp_version,
+                -maxmsgsize => $maxmsgsize
+        );
+
+        $session_opts{'-community'} = $community if (defined $community && $snmp_version =~ /[12]/);
+
         if ($snmp_version =~ /3/ ) {
                 # Must define a security level even though default is noAuthNoPriv
                 # v3 requires a security username
-                if (defined $seclevel  && defined $secname) {
+                if (defined $seclevel && defined $secname) {
+                        $session_opts{'-username'} = $secname;
                 
                         # Must define a security level even though defualt is noAuthNoPriv
-                        unless ($seclevel eq ('noAuthNoPriv' || 'authNoPriv' || 'authPriv' ) ) {
-                                usage();
-                                exit $ERRORS{"UNKNOWN"};
+                        unless ( grep /^$seclevel$/, qw(noAuthNoPriv authNoPriv authPriv) ) {
+                                usage("Must define a valid security level even though default is noAuthNoPriv");
                         }
                         
                         # Authentication wanted
-                        if ($seclevel eq ('authNoPriv' || 'authPriv') ) {
-                
-                                unless ($authproto eq ('MD5' || 'SHA1') ) {
-                                        usage();
-                                        exit $ERRORS{"UNKNOWN"};
+                        if ( $seclevel eq 'authNoPriv' || $seclevel eq 'authPriv' ) {
+                                if (defined $authproto && $authproto ne 'MD5' && $authproto ne 'SHA1') {
+                                        usage("Auth protocol can be either MD5 or SHA1");
                                 }
+                                $session_opts{'-authprotocol'} = $authproto if(defined $authproto);
 
                                 if ( !defined $authpass) {
-                                        usage();
-                                        exit $ERRORS{"UNKNOWN"};
+                                        usage("Auth password/key is not defined");
                                 }else{
                                         if ($authpass =~ /^0x/ ) {
-                                                $auth = "-authkey => $authpass" ;
+                                                $session_opts{'-authkey'} = $authpass ;
                                         }else{
-                                                $auth = "-authpassword => $authpass";
+                                                $session_opts{'-authpassword'} = $authpass ;
                                         }
                                 }
-                                        
                         }
                         
                         # Privacy (DES encryption) wanted
-                        if ($seclevel eq  'authPriv' ) {
+                        if ($seclevel eq 'authPriv' ) {
                                 if (! defined $privpass) {
-                                        usage();
-                                        exit $ERRORS{"UNKNOWN"};
+                                        usage("Privacy passphrase/key is not defined");
                                 }else{
                                         if ($privpass =~ /^0x/){
-                                                $priv = "-privkey => $privpass";
+                                                $session_opts{'-privkey'} = $privpass;
                                         }else{
-                                                $priv = "-privpassword => $privpass";
+                                                $session_opts{'-privpassword'} = $privpass;
                                         }
                                 }
+
+                                $session_opts{'-privprotocol'} = $privproto if(defined $privproto);
                         }
 
                         # Context name defined or default
-
                         unless ( defined $context) {
                                 $context = "";
                         }
                 
-                
-                
                 }else {
-                                        usage();
-                                        exit $ERRORS{'UNKNOWN'}; ;
+                        usage("Security level or name is not defined");
                 }
         } # end snmpv3
 
-        # for snmp v1 & v2c we default to community = "public"
-        
         # Excluded interfaces types (ifType) (backup interfaces, dial-on demand interfaces, PPP interfaces
         if (defined $opt_x) {
                 my @x = split(/,/, $opt_x);
@@ -380,79 +407,16 @@ sub process_arguments() {
         }
 
         if (! utils::is_hostname($hostname)){
-                usage();
+                usage("Hostname invalid or not given");
                 exit $ERRORS{"UNKNOWN"};
         }
 
-        # create SNMP session handle based on options passed.
-
-        if ( ! $snmp_version ) {
-                $snmp_version =1 ;
-        }else{
-                if ( $snmp_version =~ /[12]/ ) {
-        
-                        ($session, $error) = Net::SNMP->session(
-                                                -hostname  => $hostname,
-                                                -community => $community,
-                                                -port      => $port,
-                                                -version        => $snmp_version,
-                                                -maxmsgsize => $maxmsgsize
-                         );
-
-                if (!defined($session)) {
-                                        $state='UNKNOWN';
-                                        $answer=$error;
-                                        print ("$state: $answer");
-                                        exit $ERRORS{$state};
-                }
-
                 
-        }elsif ( $snmp_version =~ /3/ ) {
-
-                if ($seclevel eq 'noAuthNoPriv') {
-                        ($session, $error) = Net::SNMP->session(
-                                -hostname  => $hostname,
-                                -port      => $port,
-                                -version  => $snmp_version,
-                                -username => $secname,
-                        );
-
-                }elsif ( $seclevel eq 'authNoPriv' ) {
-                        ($session, $error) = Net::SNMP->session(
-                                -hostname  => $hostname,
-                                -port      => $port,
-                                -version  => $snmp_version,
-                                -username => $secname,
-                                -authprotocol => $authproto,
-                                $auth
-                        );      
-                }elsif ($seclevel eq 'authPriv' ) {
-                        ($session, $error) = Net::SNMP->session(
-                                -hostname  => $hostname,
-                                -port      => $port,
-                                -version  => $snmp_version,
-                                -username => $secname,
-                                -authprotocol => $authproto,
-                                $auth,
-                                $priv
-                        );
-                }
-                                        
-                                        
-                if (!defined($session)) {
-                                        $state='UNKNOWN';
-                                        $answer=$error;
-                                        print ("$state: $answer");
-                                        exit $ERRORS{$state};
-                }
-                        
-        }else{
+        if ($snmp_version !~ /[123]/) {
                 $state='UNKNOWN';
                 print ("$state: No support for SNMP v$snmp_version yet\n");
                 exit $ERRORS{$state};
         }
-}
 
 return $ERRORS{"OK"};
-                                
 }
diff --git a/plugins-scripts/t/check_ifstatus.t b/plugins-scripts/t/check_ifstatus.t
new file mode 100644
index 0000000..c5169d9
--- /dev/null
+++ b/plugins-scripts/t/check_ifstatus.t
@@ -0,0 +1,63 @@
+#! /usr/bin/perl -w -I ..
+#
+# SNMP Test via check_ifoperstatus
+#
+#
+
+use strict;
+use Test::More;
+use NPTest;
+
+my $tests = 9;
+plan tests => $tests;
+my $res;
+
+my $plugin = "check_ifstatus";
+SKIP: {
+        skip "$plugin is not created", $tests if ( ! -x $plugin );
+
+        my $host_snmp = getTestParameter( "host_snmp",          "NP_HOST_SNMP",      "localhost",
+                                           "A host providing an SNMP Service");
+
+        my $snmp_community = getTestParameter( "snmp_community",     "NP_SNMP_COMMUNITY", "public",
+                                           "The SNMP Community string for SNMP Testing (assumes snmp v1)" );
+
+        my $host_nonresponsive = getTestParameter( "host_nonresponsive", "NP_HOST_NONRESPONSIVE", "10.0.0.1",
+                                                   "The hostname of system not responsive to network requests" );
+
+        my $hostname_invalid   = getTestParameter( "hostname_invalid",   "NP_HOSTNAME_INVALID",   "nosuchhost",
+                                                   "An invalid (not known to DNS) hostname" );
+
+        $res = NPTest->testCmd( "./$plugin" );
+        is( $res->return_code, 3, "No arguments" );
+        like( $res->output, '/usage/', "Output contains usage" );
+        
+        $res = NPTest->testCmd( "./$plugin -H fakehost -v 3 --seclevel rubbish --secname foobar" );
+        is( $res->return_code, 3, "invalid seclevel" );
+        like( $res->output, "/Must define a valid security level/", "Output contains 'Must define a valid security level'" );
+
+        SKIP: {
+                skip "no snmp host defined", 2 if ( ! $host_snmp );
+
+                $res = NPTest->testCmd( "./$plugin -H $host_snmp -C $snmp_community ");
+                like($res->output, '/^.*host.*interfaces up/', "String contains host.*interfaces up");
+
+                $res = NPTest->testCmd( "./$plugin -H $host_snmp -C rubbish");
+                cmp_ok( $res->return_code, '==', 2, "Exit CRITICAL for community 'rubbish'" ); 
+
+        }
+
+        SKIP: {
+                skip "no non responsive host defined", 1 if ( ! $host_nonresponsive );
+                $res = NPTest->testCmd( "./$plugin -H $host_nonresponsive -C $snmp_community");
+                cmp_ok( $res->return_code, '==', 2, "Exit CRITICAL with non responsive host" ); 
+        }
+
+        SKIP: {
+                skip "no invalid host defined", 2 if ( ! $hostname_invalid );
+                $res = NPTest->testCmd( "./$plugin -H $hostname_invalid -C $snmp_community");
+                cmp_ok( $res->return_code, '==', 3, "Exit UNKNOWN with invalid host" ); 
+                like($res->output, "/Unable to resolve.*$hostname_invalid/", "String matches unable to resolve.*$hostname_invalid");
+        }
+
+}