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Full Discussion: DNS circular verify script
Top Forums Shell Programming and Scripting DNS circular verify script Post 302800837 by MadeInGermany on Tuesday 30th of April 2013 03:49:56 PM
Old 04-30-2013
You can change it like this:
Code:
# for safety turn off globbing (wild card matching in current directory)
set -f
...
    MHOST=$(dig -x "$A" +short)      # reverse lookup
    if test -n "$MHOST"; then        # If string has nonzero length then continue

      for HOST in $MHOST; do
            MADDR=$(dig "$HOST" +short)       # Now do forward lookup
            for ADDR in $MADDR; do
...

I also added another loop, for the opposite case: one host has multiple IP addresses.
For safety, variables should be quoted in command arguments.
But the for loop needs an unquoted variable, therefore the set -f at the beginning of the script.
A bit more safe and more elegant are while loops:
Code:
...
    dig -x "$A" +short |               # reverse lookup
    while read HOST; do
          dig "$HOST" +short |         # Now do forward lookup
          while read ADDR; do
...

This User Gave Thanks to MadeInGermany For This Post:
snoman1
 

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LEARN ABOUT CENTOS

ipa-dns-install

ipa-dns-install(1)						 IPA Manual Pages						ipa-dns-install(1)

NAME

       ipa-dns-install - Add DNS as a service to an IPA server

SYNOPSIS

       ipa-dns-install [OPTION]...

DESCRIPTION

       Adds DNS as an IPA-managed service. This requires that the IPA server is already installed and configured.

OPTIONS

       -p DM_PASSWORD, --ds-password=DM_PASSWORD
	      The password to be used by the Directory Server for the Directory Manager user

       -d, --debug
	      Enable debug logging when more verbose output is needed

       --ip-address=IP_ADDRESS
	      The IP address of the IPA server. If not provided then this is determined based on the hostname of the server.

       --forwarder=FORWARDER
	      A  forwarder  is a DNS server where queries for a specific non-resolvable address can be directed. To define multiple forwarders use
	      multiple instances of --forwarder

       --no-forwarders
	      Do not add any DNS forwarders, send non-resolvable addresses to the DNS root servers.

       --reverse-zone=REVERSE_ZONE
	      The reverse DNS zone to use

       --no-reverse
	      Do not create new reverse DNS zone. If used on a replica and a reverse DNS zone already exists for the subnet, it will be used.

       --zonemgr
	      The e-mail address of the DNS zone manager. Defaults to hostmaster@DOMAIN

       -U, --unattended
	      An unattended installation that will never prompt for user input

EXIT STATUS

       0 if the installation was successful

       1 if an error occurred

IPA
								   Jun 28, 2012 						ipa-dns-install(1)
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