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|
#!/bin/bash
# version #VERSION#
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
sed '
/^\(#\|\s\)/ d
s/^\([46]!\?\)\([46]!\?\)\(\s.*$\)/\1\3\n\2\3/
' #ETCDIR#/update-ddns.conf \
| while read -r ipVer updateUrl dnsName; do
if [[ "${ipVer}" == 'ignore' ]]; then
ignoreIps=$(
printf '%s\n' "${ignoreIps}" "${updateUrl}" "${dnsName}" \
| grep -vxF '' \
| sort -u
)
continue
fi
if [ -z "${ipVer##*!}" ]; then
ipVer="${ipVer%!}"
else
[ -z "$(${ipCmd} -o -${ipVer} addr show scope global)" ] && continue
fi
if [ "${ipVer}" == '4' ]; then
dnsVer='A'
inetVer='inet'
ipRegex='[0-9.]\+'
elif [ "${ipVer}" == '6' ]; then
dnsVer='AAAA'
inetVer='inet6'
ipRegex='[0-9a-f:]\+'
else
>&2 echo 'Syntax error in "#ETCDIR#/update-ddns.conf"!'
>&2 echo 'Syntax should be:'
>&2 echo '# comments start with "#" or white space'
>&2 echo '4/6/46/64 update-url dns-name/check-url'
>&2 echo 'digits in the first column may be followed by "!" to indicate'
>&2 echo 'that this ip version should be updated regardless of whether'
>&2 echo 'an according global ip was found (mostly useful with "auto")'
exit 1
fi
if [ -z "${dnsName##*/*}" ]; then
dnsIps=$(
# this test yields 1 if the dns record is already properly set
curl -s${ipVer} "${dnsName}"
)
ips='1'
updateIps='auto'
else
dnsIps=$(
dig +short $1 "${dnsName}" ${dnsVers[${j}]} \
| grep -x "${ipRegex}" \
|sort -u
)
ips=$(
"${ipCmd}" -o -${ipVer} addr show scope global | \
awk '{print $4}' | \
cut -d/ -f1 | \
grep -vx "${ignoreIps}" | \
sort -u
)
if [ -z "${ips}" ]; then
updateIps='auto'
else
updateIps=$(
printf '%s\n' "${ips}" \
| tr '\n' ',' \
| sed 's/,$//'
)
fi
fi
[ "${dnsIps}" = "${ips}" ] && continue
if [ -z "${updateUrl##*?*}" ]; then
updateIps='&address='"${updateIps}"
else
updateIps='?address='"${updateIps}"
fi
curl -${ipVer} -sS "${updateUrl}${updateIps}" 2>/dev/null || err=$?
done
exit ${err}
|
