Could we please have a macro {HOST.IP} ?

[frater]

I wrote a little external script that can check the validity of {HOST.DNS}
The item function is:

dnsverify[ {HOST.DNS1} ]

It returns 1 if everything is OK and 0 if there's an error of some kind (INVALID).
The script doesn't just get the DNS name from the default DNS-server, but checks it directly at the Authorative server.
All this works fine....

I would like to have some additional functionality, but found out I'm missing the macro {HOST.IP1}
I would like to compare the DNS to the IP it is supposed to have according to the Zabbix interface.

dnsverify[ {HOST.DNS1} {HOST.IP1} ]

If {HOST.DNS1} can be resolved, but it doesn't correspond {HOST.IP1} it returns a 2.
I have also changed the value mapping of "service state" and added an "Invalid" for the value of "2".

The problem is that I can't fully implement what I want to do as the macro {HOST.IP1} does not exist.
Can this be added or is there some workaround?

[frater]

Here's the script:

#!/bin/bash
export PATH=${PATH}:/usr/local/sbin:/sbin:/usr/sbin:/bin:/usr/bin

# If called by zabbix, handle some things different
echo "${BASH_SOURCE}" | grep -q "zabbix" && shift 1

ARECORD="$1"
IP_SHOULDBE="$2"
RETVAL=0

# If DNS is not supplied then return empty string to turn ITEM into "unsupported ITEM"
[ -z "${ARECORD}" ] && exit

# Sanitize DNS-record
ARECORD=`echo "${ARECORD}" | tr '[A-Z]' '[a-z]'`
SAN_ARECORD=`echo "${ARECORD}" | tr -cd '[.a-z0-9-]'`

# ARECORD has invalid characters, abort
[ "${ARECORD}" = "${SAN_ARECORD}" ] || exit

# add a trailing dot if it's not there
! echo "${ARECORD}" | grep -q ".*\.$" && ARECORD="${ARECORD}."
# extract TOPLEVEL for further processing
TOPLEVEL=`echo "${ARECORD}" | egrep -o "[a-z0-9-]+\.[a-z]+\.$"`

# Can't extract TOPLEVEL, make ITEM invalid by returning null string
[ -z "${TOPLEVEL}" ] && exit

# Fetch the SOA record (Start of Authority) to obtain the real DNS-server
SOA=`host -t soa ${TOPLEVEL} 2>/dev/null | grep -o "has SOA record .*" | awk '{print $4}'`

if [ ! -z "${SOA}" ] ; then
  IP_ACTUAL=`host ${ARECORD} ${SOA} 2>/dev/null | grep -o 'has address .*' | head -n1 | awk '{print $3}'`

  # Error resolving on Authorative server... Maybe it's a CNAME on a foreign domain??
  # An authorative server is often configured to resolve only local domains.
  # Further testing of the answer is NOT done using an authorative server, this is beyond the scope of this test.
  if [ -z "${IP_ACTUAL}" ] ; then
   CNAME=`host -t cname ${ARECORD} ${SOA} 2>/dev/null | grep -o 'alias for .*' | head -n1 | awk '{print $3}'`
   IP_ACTUAL=`host ${CNAME} 2>/dev/null | grep -o 'has address .*' | head -n1 | awk '{print $3}'`
  fi

  # We finally have a WINNER...
  if [ ! -z "${IP_ACTUAL}" ] ; then
    if [ -z "${IP_SHOULDBE}" ] || [ "${IP_SHOULDBE}" = '0.0.0.0' ] ; then
      RETVAL=1
    else
      RETVAL=2
      [ "${IP_SHOULDBE}" = "${IP_ACTUAL}" ] && RETVAL=1
    fi
  fi
fi

echo "${RETVAL}"

[frater]

It seems the macro {IPADDRESS1} is already the one I needed.
The layout of this wiki: http://www.zabbix.com/documentation/.../config/macros

made me think it was something else than the IP-address that was entered in the webif. I thought it was the IP it was talking to, but I tried it, did some tests and it worked fine.

The script can be used within a template using this syntax:

zabbix external
dnsverify[ {HOST.DNS1} {IPADDRESS} ]
interval: 900
Numeric unsigned
Service State

Trigger 1

DNS does not resolve for {HOSTNAME}
{Template_Standalone:dnsverify[ {HOST.DNS1} {IPADDRESS1} ].last(0)}=0
High

Trigger 2

DNS does NOT correspond the IP given for {HOSTNAME}
{Template_Standalone:dnsverify[ {HOST.DNS1} {IPADDRESS1} ].last(0)}=2
High

So, we don't need an extra macro....

Maybe the moderator can move this thread to cookbook?