Passing command line perameters to script

[tokind]

I am having one heck of a time passing a dns name to a script to do an nslookup for the purpose of testing to the root servers for connectivity. I've tried this with both bash and php and I keep getting the same results.

On my Zabbix server I have zabbix_agentd running. It is called quite a few scripts which do not require parameters. Those scripts test our NTP and DNS servers. This one should query any of a-h.root-servers.net, just to verify a response from the server.

Here is the zabbix_agentd.conf entry for the script:

UserParameter=ROOTS[*],/usr/local/www/data/netmon/scripts/roots.php $1

Here is the Action defined to execute the test:

Description: A.ROOTS
Type :        Zabbix Agent
Key 	:        ROOTS[{HOST.CONN}]
Type of information: Numeric (integer 64 bit)

Here is what the host entry error says:

Got empty string from [a.root-servers.net]. Assuming that agent dropped connection because of access permissions

The server log says:

Item [a.root-servers.net:ROOTS[a.root-servers.net]] error: Got empty string from [a.root-servers.net]. Assuming that agent dropped connection because of access permissions

The client log says nothing of the incident. I took care to list the host ips and hostname in the zabbix_agentd.conf script.

I set the owner of the scripts to zabbix and set +x. The other scripts have been running just dandy. They do not require a parameter.

I must be missing something stupid. I code in php, perl, bash, cscript, etc. and this just cannot be this hard.

It sure would be useful if this were in the zabbix manual with a few examples.

############ GENERAL PARAMETERS #################

# List of comma delimited IP addresses (or hostnames) of ZABBIX servers.
# No spaces allowed. First entry is used for sending active checks.
# Note that hostnames must resolve hostname->IP address and
# IP address->hostname.

Server=127.0.0.1,192.168.1.59,172.22.221.100

# Server port for sending active checks

#ServerPort=10051

# Unique hostname. Required for active checks.

Hostname=helpdeskii

# Listen port. Default is 10050

#ListenPort=10050

# IP address to bind agent
# If missing, bind to all available IPs

#ListenIP=127.0.0.1

# Number of pre-forked instances of zabbix_agentd.
# Default value is 5
# This parameter must be between 1 and 16

StartAgents=5

# How often refresh list of active checks. 2 minutes by default.

#RefreshActiveChecks=120
# Disable active checks. The agent will work in passive mode listening server.

DisableActive=1

# Enable remote commands for ZABBIX agent. By default remote commands disabled.

#EnableRemoteCommands=1

# Specifies debug level
# 0 - debug is not created
# 1 - critical information
# 2 - error information
# 3 - warnings (default)
# 4 - for debugging (produces lots of information)

DebugLevel=3

# Name of PID file

PidFile=/var/tmp/zabbix_agentd.pid

# Name of log file.
# If not set, syslog will be used

LogFile=/var/log/zabbix_agentd.log

# Spend no more than Timeout seconds on processing
# Must be between 1 and 30

Timeout=30

####### USER-DEFINED MONITORED PARAMETERS #######
# Format: UserParameter=<key>,<shell command>
# Note that shell command must not return empty string or EOL only
#UserParameter=system.test,who|wc -l
### Set of parameter for monitoring MySQL server (v3.23.42 and later)
### Change -u<username> and add -p<password> if required

UserParameter=DNSL,/usr/local/www/data/netmon/scripts/dnschk.php 192.168.1.10
UserParameter=DNSN,/usr/local/www/data/netmon/scripts/dnschk.php 192.168.6.10
UserParameter=DNSE,/usr/local/www/data/netmon/scripts/dnschk.php 192.168.4.10
UserParameter=DNST,/usr/local/www/data/netmon/scripts/dnschk.php 192.168.10.10
UserParameter=DNSW,/usr/local/www/data/netmon/scripts/dnschk.php 192.168.2.10
UserParameter=NTPtime1,/usr/local/www/data/netmon/scripts/ntpchk.php 192.168.1.59
UserParameter=ROOTS[*],/usr/local/www/data/netmon/scripts/roots.php $1

Here is the script

#!/usr/local/bin/php
<?php
   // dnslookup
   // DNS lookup scripts for Zabbix monitor. Conditional return
   // of 1=success | 0=failed

    $result=0;
    if($_SERVER["argv"][1])
    {
        $dns_server = $_SERVER["argv"][1];
    } else {
        echo "You need to supply a DNS server to check. Quitting.\n";
        exit;
    }

    // Do query
    if(shell_exec('host -tSOA . $dns_server | grep "has SOA" | wc -l')==1)
    {

        $result= 1; // success

    } else {

       $result= 0; // failure

    }

    echo $result;
?>

Works just fine from the command line.

[tokind]

My bad. I created the root servers as hosts. I referenced the root servers as actions.

What I meant to do was create the Actions against the Zabbix Host (where the script resides) and pass the dns name of the root servers to that script.

The wonder is that it took me three days to figure out where I got off on the wrong foot.