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166MMX/checkDns.sh

Created April 19, 2013 19:21
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checkDns.sh
#!/bin/sh
dnsName=
dnsServer=
checkUrl=
refreshUrl=
nsResult=$(nslookup -querytype=A "${dnsName}" "${dnsServer}" \
| sed -n '
/^Address:/ {
s/^.*:\s*// p
}
' \
| tail --lines=1 \
)
checkResult=$(curl --fail --silent --no-keepalive --retry 0 "${checkUrl}" \
| sed -n '
s|.*<body>Current IP Address: \(.*\)</body>.*|\1| p
' \
)
[ "$nsResult" != "$checkResult" ] \
&& curl --fail --silent --no-keepalive --retry 0 "${refreshUrl}" \
1> /dev/null
exit 0
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