JohnS wrote:
> Awsome but a Day Late and a Dollar Short && Care to share that shell
> script please.
OK, but I warned you, it's a kludge.
> #!/bin/bash
> #
> # Get a list of the hosts on the local network via nmap -sP and check
> # them against the ethers file to retrieve the host name, if any.
> # Check DNS to see if the DNS entries match it in the local domain and,
> # if not, make the necessary changes.
> #
> # $Id$
> # Jay Leafey - 10/29/2009
> #
>
> TEST=0
> test $# -gt 0 && TEST=1
>
> NSUPDATES=$( mktemp -t dynamic_dns.XXXXXXXXXX )
> ME=$( hostname -f )
>
> echo "server localhost" > ${NSUPDATES}
>
> nmap -sP 192.168.1.0/24 | \
> while read f1 f2 f3 f4 f5
> do
> if [ "${f1}" == "Host" ]
> then
> if [ "${f2}" == "${ME}" ]
> then
> continue
> fi
> read m1 m2 m3 m4 m5
> MYIP=""
> if [ "${f2%.*}" == "192.168.1" ]
> then
> MYIP=${f2}
> else
> MYIP=$( echo "${f3}" | sed 's/[\(\)]//g' )
> fi
> MYMAC=${m3}
> MYHOST=$( grep -i "^${MYMAC}" /etc/ethers | awk "{ print \$2 }" | tr A-Z a-z)
> #~ echo "${MYMAC} ${MYIP} ${MYHOST}"
>
> if [ "${MYHOST}" ]
> then
> #~ Set the "forward" DNS entry
> DNSIP=$( host ${MYHOST} 2>/dev/null | awk '/ has address / { print $NF}' )
> if [ -z "${DNSIP}" ]
> then
> echo -e "update add ${MYHOST}.local 2400 IN A ${MYIP}\n" >> ${NSUPDATES}
> elif [ "${MYIP}" != "${DNSIP}" ]
> then
> echo "update delete ${MYHOST}.local IN A ${DNSIP}" >> ${NSUPDATES}
> echo -e "update add ${MYHOST}.local 240 IN A ${MYIP}\n" >> ${NSUPDATES}
> fi
> #~ Set the "reverse" DNS entry
> DNSRR=$( host ${MYIP} | awk '/ domain name pointer / { print $1 }' )
> DNSPTR=$( host ${MYIP} | awk '/ domain name pointer / { print $NF }' )
> if [ -z "${DNSPTR}" ]
> then
> echo -e "update add ${MYIP##*.}.1.168.192.in-addr.arpa 2400 IN PTR ${MYHOST}.local.\n" >> ${NSUPDATES}
> elif [ "${DNSPTR}" != "${MYHOST}.local." ]
> then
> echo "update delete ${DNSRR} IN PTR" >> ${NSUPDATES}
> echo -e "update add ${DNSRR} 2400 IN PTR ${MYHOST}.local.\n" >> ${NSUPDATES}
> fi
> fi
> fi
> done
>
> if [ ${TEST} -gt 0 ]
> then
> cat ${NSUPDATES}
> exit
> fi
>
> if [ $( wc -l ${NSUPDATES} ) -gt 1 ]
> then
> # cat ${NSUPDATES}
> nsupdate ${NSUPDATES}
> if [ $? -ne 0 ]
> then
> echo "nsupdate failed:"
> cat ${NSUPDATES}
> fi
> fi
>
> rm -f ${NSUPDATES}
>
> exit
The code makes a LOT of assumptions that may only be valid in my home
network, but perhaps the ideas will be useful. I have considered
rewriting this in Perl, but it works and I really need the time for
other projects.
> && Why you scrub the MACS?
Sheer paranoia and long-standing habit.
Enjoy!
--
Jay Leafey - jay.leafey at mindless.com
Memphis, TN
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/x-pkcs7-signature
Size: 3274 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://lists.centos.org/pipermail/centos/attachments/20100717/78402e85/attachment-0003.bin>