contrib/check_traceroute.pl

   1 #!/usr/bin/perl
   2
   3 # $Id$
   4
   5 # $Log$
   6 # Revision 1.1  2005/01/27 10:34:16  stanleyhopcroft
   7 # Jon Meek's check_traceroute for Mon hacked by YT for Nagios. Prob pretty weak
   8 #
   9
  10 use strict ;
  11
  12 use vars qw(%ERRORS $TIMEOUT) ;
  13 use utils qw(%ERRORS  $TIMEOUT &print_revision &support &usage) ;
  14
  15 sub print_help ();
  16 sub print_usage ();
  17
  18 $ENV{'PATH'}='/bin:/usr/bin:/usr/sbin';
  19
  20 my $PROGNAME                    = 'check_traceroute' ;
  21                                                                                 # delay units are millisecs.
  22 my $MAX_INTERHOP_DELAY  = 200 ;
  23 my $MAX_HOPS                    = 30 ;
  24
  25 use Getopt::Std;
  26
  27 use vars qw($opt_H $opt_N $opt_r $opt_R $opt_T $opt_d $opt_h $opt_i $opt_v $opt_V) ;
  28
  29 getopts('i:H:N:R:T:dhrvV');
  30                                                                                 # H, N, R, T, and i take parms, others are flags
  31
  32 do { print_help ; exit $ERRORS{OK}; }
  33         if $opt_h ;
  34
  35 do { print_revision($PROGNAME, '$Revision$'); exit $ERRORS{OK}; }
  36         if $opt_V ;
  37
  38 do { print_help; exit $ERRORS{OK}; }
  39         unless $opt_R || $opt_r ;
  40
  41 do { print_help; exit $ERRORS{OK}; }
  42         unless $opt_R =~        m|
  43                                                         (?:\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}-)+
  44                                                         \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}
  45                                                 |x
  46         || $opt_r ;
  47
  48 my $should_be           = $opt_R ;
  49                                                                                 # Set default timeout in seconds
  50 my $TimeOut                     = $opt_T || $TIMEOUT;
  51
  52 my $max_interhop_delay  = $opt_i || $MAX_INTERHOP_DELAY ;
  53 my $max_hops            = $opt_N || $MAX_HOPS ;
  54
  55 my $TRACEROUTE          = '/usr/sbin/traceroute';
  56
  57 my $TargetHost          = $opt_H ;
  58
  59 print_help
  60         unless $TargetHost ;
  61
  62 my ($route, $pid, $rta_list) = ( '', '', '' );
  63 my %ResultString = () ;
  64
  65 $SIG{ALRM} = sub { die "timeout" };
  66
  67 eval {
  68
  69         alarm($TimeOut);
  70                                                                                 # XXXX Discarding STDERR _should_ reduce the risk
  71                                                                                 # of unexpected output but consequently, results for
  72                                                                                 # non existent hosts are stupid. However, why would you
  73                                                                                 # specify a route to a NX host, other than a typo ...
  74
  75         $pid = open(TR, "$TRACEROUTE -n $TargetHost 2>/dev/null |")
  76                 or do   {
  77                                          "Failed. Cannot fork \"$TRACEROUTE\": $!" ;
  78                                          $ERRORS{UNKNOWN} ;
  79                                 } ;
  80
  81         my $hops = 0 ;
  82         while (<TR>) {
  83
  84                 print $_
  85                         if $opt_d;
  86
  87                 if ( m|#\*\s+\*\s+\*| ) {
  88                                                                                 # Get * * * then give up
  89                         $route .= '*';
  90                                                                                 # 13 = PIPE, prevents Broken Pipe Error, at least on Solaris
  91                         kill 13, $pid;
  92                         last;
  93                 }
  94                                                                                 # We will only pick up the first IP address listed on a line for now
  95                                                                                 # traceroute to csg.citec.com.au (203.9.184.12), 64 hops max, 44 byte packets
  96                                                                                 # 1  10.254.254.254  0.868 ms  0.728 ms  0.705 ms
  97                                                                                 # 2  192.168.9.1  1.240 ms  1.165 ms  1.191 ms
  98
  99                 my ($ThisHopIP) = m|\s+(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\s+|;
 100                 my ($max_rta)   = m|\d{1,3}\.\d{1,3}\.\d{1,3}\s+ (\d+\.\d+) ms| ;
 101
 102                 $route          .= $ThisHopIP . '-';
 103                 $rta_list       .= sprintf("%.1f", $max_rta) . '-' ;
 104
 105                 if ( $opt_v ) {
 106                         chomp $_ ;
 107                         print $_, ' ' x (58 - length), $route, "\n";
 108                 }
 109
 110                 $hops++ ;
 111
 112                 if ( ($hops >= $max_hops) && ! $opt_r ) {
 113                                 kill 13, $pid ;
 114                                 print qq(Failed. Max hops ($max_hops) exceeeded: incomplete after $hops hops, "$route".\n) ;
 115                                 exit $ERRORS{CRITICAL} ;
 116                 }
 117                 if ( ($hops %2 == 0) && ($hops >= 4)  && ! $opt_r ) {
 118
 119                                                                                 # Check for 2 cycles at end of path ie -(a-b)-(a-b)$
 120                                                                                 # where a and b are IP v4 addresses of IS (routers).
 121
 122                         my ($last_2_is) = $route =~ /(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}-\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})-$/ ;
 123                         if ( $route =~ /$last_2_is-$last_2_is-$/ ) {
 124                                 kill 13, $pid ;
 125                                 print qq(Failed. Last 2 routers ($last_2_is) repeated, "$route".\n) ;
 126                                 exit $ERRORS{CRITICAL} ;
 127                         }
 128
 129                 }
 130
 131         }
 132 };
 133
 134 alarm(0);
 135
 136 if ( $@ and $@ =~ /timeout/ ) {
 137                 $route .= '*';
 138                                                                                 # It was a traceroute timeout
 139                 kill 13, $pid;
 140 } elsif ( $@ and $@ !~ /timeout/ ) {
 141                 close TR ;
 142                 print "Failed. Somethings gone wrong with \"$TRACEROUTE\": $!" ;
 143                 exit $ERRORS{UNKNOWN} ;
 144 }
 145
 146 close TR;
 147                                                                                 # Remove trailing '-'s
 148 # $route =~ s/\-$//;
 149 chop($route) ;
 150 chop($rta_list) ;
 151
 152 print "$route\n"
 153         if $opt_d;
 154
 155 if ( $opt_r ) {
 156         print qq(Ok. Traceroute to host "$TargetHost" via route "$route".\n) ;
 157         exit $ERRORS{OK};
 158 }
 159
 160 if ( &RouteEqual($should_be, $route) ) {
 161         print qq(Ok. Traceroute to "$TargetHost" via expected route "$route" ($rta_list).\n) ;
 162         exit $ERRORS{OK};
 163 } else {
 164         print qq(Failed. Route "$route" ne expected "$should_be".\n) ;
 165         exit $ERRORS{CRITICAL};
 166 }
 167
 168
 169 sub RouteEqual {
 170         my ($current_route, $prev_route) = @_;
 171         return $current_route eq $prev_route ;
 172 }
 173
 174 sub print_usage () {
 175         print "Usage: $PROGNAME [ -R <route_string>|-r ] [ -d  -T timeout -v -h -i ] -H <host>\n";
 176 }
 177
 178 sub print_help () {
 179         print_revision($PROGNAME, '$Revision$') ;
 180         print "Copyright (c) 2004 J Meek/Karl DeBisschop
 181
 182 This plugin checks whether traceroute to the destination succeeds and if so that the route string option (-R) matches the list of routers
 183 returned by traceroute.
 184
 185 ";
 186 print_usage();
 187         print "
 188 -d
 189    Debug
 190 -h
 191    Help
 192 -i
 193    _TODO_
 194    Max inter-hop delay (msec).
 195 -H
 196    Host.
 197 -N
 198    Max number of hops.
 199 -r
 200    Record current route (and output to STDOUT). Useful for getting the value of -R option ...
 201 -v
 202    Greater verbosity.
 203 -R
 204    Mandatory route string ie r1-r2-... where ri is the ip address of the ith router.
 205 -T
 206    Maximum time (seconds) to wait for the traceroute command to complete. Defaults to $TIMEOUT seconds.
 207
 208 ";
 209         support();
 210 }