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|
#!/bin/bash
set -e
stty &> /dev/null || \
sleep $[$RANDOM%60]
if ! ipCmd="$(which ip 2> /dev/null)"
then
for p1 in / /usr/
do
for p2 in bin/ sbin/
do
ipCmd="${p1}${p2}ip"
[ -x "${ipCmd}" ] && break
done
[ -x "${ipCmd}" ] && break
done
fi
while read -r ipVer updateUrl dev dnsName
do
if [[ "${ipVer}" = '#'* ]] || [ -z "${ipVer}" ]
then
continue
fi
if [ "${ipVer}" == "4" ]
then
dnsVer="A"
inetVer="inet"
ipCmdVer='-4'
elif [ "${ipVer}" == "6" ]
then
dnsVer="AAAA"
inetVer="inet6"
ipCmdVer='-6'
else
>&2 echo 'Error: First column in "#ETCDIR#/update-ddns.conf" needs to be "4" or "6"!'
exit 1
fi
if [ -z "${dnsName}" ]
then
dnsIps="$(
curl -${ipVer} "${dev}" 2> /dev/null
)"
ips="1"
unset updateIp
else
dnsIps="$(
dig $1 "${dnsName}" ${dnsVer} | \
grep -v '^\s*\(;\|$\)' | \
grep "\s${dnsVer}\s" | \
awk '{print $5}' | \
sort -u
)"
if [ "${dev}" == "-" ]
then
unset dev
else
dev="dev ${dev}"
fi
ips="$(
"${ipCmd}" -o "${ipCmdVer}" addr show ${dev} scope global | \
awk '{print $4}' | \
cut -d/ -f1 | \
sort -u
)"
if [ $(echo "${ips}" | wc -l) -eq 1 ]
then
updateIp='address='"${ips}"
if [[ "${updateUrl}" = *'?'* ]]
then
updateIp='&'"${updateIp}"
else
updateIp='?'"${updateIp}"
fi
else
unset updateIp
fi
fi
if [ -z "$(
(
echo "${dnsIps}"
echo "${ips}"
) | \
sort | \
uniq -d
)" ]
then
curl -${ipVer} -sS "${updateUrl}${updateIp}" 2> /dev/null
fi
done < #ETCDIR#/update-ddns.conf
|
