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change: handle dns server selection

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This commit is contained in:
Eduard Veit
2021-09-13 13:16:27 +02:00
parent 3ded7fc883
commit 046a728f22
1 changed files with 60 additions and 47 deletions
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107
dynb.sh
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@@ -41,7 +41,7 @@ _ipv4_checker=api64.ipify.org
_ipv6_checker=api64.ipify.org
## An exernal DNS check server prevents wrong info from local DNS servers/resolvers
_DNS_checkServer=1.1.1.1
_DNS_checkServer=
## if you are actively using multiple network interfaces you might want to specify this
## normally the default value is okay
@@ -161,13 +161,18 @@ function getDNSIP() {
# 2. param: IP check server address
# result to stdout
function getRemoteIP() {
curl --silent "$_interface_str" --user-agent "$_userAgent" \
--ipv"${1}" --dns-servers 1.1.1.1 --location "${2}"
# shellcheck disable=2181
if [[ $? -gt 0 ]]; then
errorMessage "IPCheck (getRemoteIP ${1}) request failed"
exit 1
fi
if [[ -n $_DNS_checkServer ]]; then
curl --silent "$_interface_str" --user-agent "$_userAgent" \
--ipv"${1}" --dns-servers "$_DNS_checkServer" --location "${2}"
else
curl --silent "$_interface_str" --user-agent "$_userAgent" \
--ipv"${1}" --location "${2}"
fi
# shellcheck disable=2181
if [[ $? -gt 0 ]]; then
errorMessage "IPCheck (getRemoteIP ${1}) request failed"
exit 1
fi
}
# requires parameter
@@ -412,46 +417,54 @@ function checkStatus() {
# requires parameter
# 1. param: 4 or 6 for IP version
function ipHasChanged() {
case ${1} in
4 )
remote_ip=$(getRemoteIP 4 $_ipv4_checker)
if [[ $DYNB_UPDATE_METHOD == domrobot ]]; then
dns_ip=$(getDNSIP A)
else
dig_response=$(dig @${_DNS_checkServer} in a +short "$DYNB_DYN_DOMAIN")
if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]; then
errorMessage "DNS request failed $dig_response"
return 0
fi
dns_ip=$dig_response
fi
_new_IPv4=$remote_ip
debugMessage "New IPv4: $_new_IPv4 old was: $dns_ip"
;;
6 )
remote_ip=$(getRemoteIP 6 $_ipv6_checker)
if [[ $DYNB_UPDATE_METHOD == domrobot ]]; then
dns_ip=$(getDNSIP AAAA)
else
dig_response=$(dig @${_DNS_checkServer} in aaaa +short "$DYNB_DYN_DOMAIN")
if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]; then
errorMessage "DNS request failed $dig_response"
return 0
fi
dns_ip=$dig_response
fi
_new_IPv6=$remote_ip
debugMessage "New IPv6: $_new_IPv6 old was: $dns_ip"
;;
* )
;;
esac
case ${1} in
4)
remote_ip=$(getRemoteIP 4 $_ipv4_checker)
if [[ $DYNB_UPDATE_METHOD == domrobot ]]; then
dns_ip=$(getDNSIP A)
else
if [[ -n $_DNS_checkServer ]]; then
dig_response=$(dig @"${_DNS_checkServer}" in a +short "$DYNB_DYN_DOMAIN")
else
dig_response=$(dig in a +short "$DYNB_DYN_DOMAIN")
fi
if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]; then
errorMessage "DNS request failed $dig_response"
return 0
fi
dns_ip=$dig_response
fi
_new_IPv4=$remote_ip
debugMessage "New IPv4: $_new_IPv4 old was: $dns_ip"
;;
6)
remote_ip=$(getRemoteIP 6 $_ipv6_checker)
if [[ $DYNB_UPDATE_METHOD == domrobot ]]; then
dns_ip=$(getDNSIP AAAA)
else
if [[ -n $_DNS_checkServer ]]; then
dig_response=$(dig @"${_DNS_checkServer}" in aaaa +short "$DYNB_DYN_DOMAIN")
else
dig_response=$(dig in aaaa +short "$DYNB_DYN_DOMAIN")
fi
if [[ $dig_response == ";; connection timed out; no servers could be reached" ]]; then
errorMessage "DNS request failed $dig_response"
return 0
fi
dns_ip=$dig_response
fi
_new_IPv6=$remote_ip
debugMessage "New IPv6: $_new_IPv6 old was: $dns_ip"
;;
*) ;;
if [[ "$remote_ip" == "$dns_ip" ]]; then
return 0
else
return 1
fi
esac
if [[ "$remote_ip" == "$dns_ip" ]]; then
return 0
else
return 1
fi
}
################