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|
#!/usr/bin/perl
#
# Monitor external programs via SNMP (v. 1-3)
# (based on netsnmp-freespace.monitor)
#
# Usage:
# [-h] # Usage
# [-t Timeout] # Timeout in ms (default: 1000000)
# [-r Retries] # Retries before failure (default: 5)
# [-v SNMPversion] # 1,2,2c or 3 (default: 1)
# [-c Community] # For SNMP v.1,2,2c (default: public)
# [-u snmpuser] # For SNMP v.3 (default: initial)
# [-l seclevel] # For SNMP v.3 (default: noAuthNoPriv)
# [-A authpassphrase] # For SNMP v.3
# [-n num[,num...]] # Zero-indexed external program number(s); programs
# # are numbered by the order they appear in the
# # remote snmpd.conf. If monitoring specific programs
# # on multiple hosts, they must be consistent!
# # Default is to monitor all.
# host [host ...]
#
# This script monitors one or more external programs run by the UCD
# SNMP agent. Specific programs to monitor can be specified with the
# "-n" option; these are zero-indexed in the order they appear in the
# monitored host's snmpd.conf file. Default is to monitor all.
#
# The summary output line will be of the form "host:name[,host:name]"
# where "name" is the name of the failing program (the "extNames"
# field as defined in snmpd.conf; not the path to the program). The
# detail lines will contain full error text from the failing program
# and the error value it returned.
#
# The script will exit with 0 value 1 for an extNames program failure
# and 2 for an SNMP error.
#
# BUGS AND LIMITATIONS: This is designed to handle programs that only
# return one line of output via snmpd; that is, with simple programs
# run via the "sh" or "exec" directives in the snmpd.conf file and NOT
# with programs run by "exec" and returning data in their own MIB
# tables. Actually, I've only gotten the "sh" directive to work with
# ucd-snmp-4.2.1 under Solaris. Also note that when given an external
# program number that doesn't exist on the monitored host, the script
# will return the output for program number 0 and will not report an
# error (see note below). In some situations (e.g. sending v. 1 request
# to a host configured only to respond to v. 3) the script will fail
# silently, because the SNMP module doesn't report an error.
#
#
# Copyright (C) 2001 Daniel J. Urist <durist@world.std.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
use SNMP;
use Getopt::Std;
$ENV{'MIBS'} = "UCD-SNMP-MIB";
getopts("ht:r:v:c:u:l:A:n:");
my $VERSION = "0.2";
if($opt_h){
print <<"USAGE";
$0 Version $VERSION by Daniel J. Urist <durist\@world.std.com>
Usage:
[-h] # Usage
[-t Timeout] # Timeout in ms (default: 1000000)
[-r Retries] # Retries before failure (default: 5)
[-v SNMPversion] # 1,2,2c or 3 (default: 1)
[-c Community] # For SNMP v.1,2,2c (default: public)
[-u snmpuser] # For SNMP v.3 (default: initial)
[-l seclevel] # For SNMP v.3 (default: noAuthNoPriv)
[-A authpassphrase] # For SNMP v.3
[-n num[,num...]] # Zero-indexed external program number(s); programs
# are numbered by the order they appear in the
# remote snmpd.conf. If monitoring specific programs
# on multiple hosts, they must be consistent!
# Default is to monitor all.
host [host ...]
USAGE
exit;
}
# FIXME we should probably offer all the v3 options that the SNMP module does
my $Timeout = $opt_t || 1000000;
my $Retries = $opt_r || 5;
my $SNMPVersion = $opt_v || 1;
my $Community = $opt_c || 'public';
my $SecName = $opt_u || 'initial';
my $SecLevel = $opt_l || 'noAuthNoPriv';
my $Authpass = $opt_A || '';
my %SNMPARGS = (
Timeout => $Timeout,
Version => $SNMPVersion,
);
if ($SNMPVersion eq "3"){
$SNMPARGS{SecName} = $SecName;
$SNMPARGS{SecLevel} = $SecLevel;
$SNMPARGS{AuthPass} = $Authpass;
}
else{
$SNMPARGS{Community} = $Community;
}
my @Extprognums = split(",", $opt_n);
my $RETVAL = 0;
my %Failures;
my %Longerr;
my $Session;
foreach $host (@ARGV) {
$Session = new SNMP::Session(
DestHost => $host,
%SNMPARGS,
);
unless( defined($Session) ) {
$RETVAL = ($RETVAL == 1) ? 1 : 2;
$Failures{"$host session error"} = "";
$Longerr{"$host could not get SNMP session"} = "";
next;
}
my $ext;
my $v;
my @q;
# We are monitoring specific programs
# FIXME If $ext is out of range, i.e. for example, if $ext is 2 and
# there are only programs numbered 0 and 1, the returned value is
# for program number 0. It seems to me we should get an SNMP error
# back, but we don't; I suspect this is a bug in the SNMP module
# since passing a bogus index to snmpwalk gives a "No Such Instance"
# error. Unfortunately I also can't find a way to retrieve the index
# number from the returned data, so I have nothing with which to
# compare it and flag the error.
if( defined(@Extprognums) ){
foreach $ext (@Extprognums){
$v = new SNMP::Varbind (["extIndex", $ext]);
$Session->getnext($v);
@q = $Session->get ([
["extNames", $v->iid], # 0
["extCommand", $v->iid], # 1
["extResult", $v->iid], # 2
["extOutput", $v->iid], # 3
["extErrFix", $v->iid], # 4
]);
if($q[2] != 0){
$RETVAL = 1;
$Failures{$host .":" . $q[0]} = "";
$Longerr{$host .":" . $q[0] . " exited with code: " . $q[2] . ", error: \"" . $q[3] . "\""} = "";
}
if ($Session->{"ErrorStr"}) {
$RETVAL = ($RETVAL == 1) ? 1 : 2;
$Failures{$host} = "";
$Longerr{"$host returned an SNMP error: " . $Session->{"ErrorStr"}} = "";
last;
}
}
}
# We are monitoring all programs
else{
$v = new SNMP::Varbind (["extIndex"]);
$Session->getnext($v);
while (!$Session->{"ErrorStr"} && $v->tag eq "extIndex") {
@q = $Session->get ([
["extNames", $v->iid], # 0
["extCommand", $v->iid], # 1
["extResult", $v->iid], # 2
["extOutput", $v->iid], # 3
["extErrFix", $v->iid], # 4
]);
if($q[2] != 0){
$RETVAL = 1;
$Failures{$host .":" . $q[0]} = "";
$Longerr{$host .":" . $q[0] . " exited with code: " . $q[2] . ", error: \"" . $q[3] . "\""} = "";
}
if ($Session->{"ErrorStr"}) {
$RETVAL = ($RETVAL == 1) ? 1 : 2;
$Failures{$host} = "";
$Longerr{"$host returned an SNMP error: " . $Session->{"ErrorStr"}} = "";
last;
}
$Session->getnext($v);
}
}
}
if (scalar keys %Failures) {
print join (", ", sort keys %Failures), "\n", "\n";
print join ("\n", sort keys %Longerr), "\n";
}
exit $RETVAL;
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