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Adding check for valid ip address

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In some cases the return body from ifconfig.co is an HTML error page.
This change makes sure the response is a valid IP address.
This commit is contained in:
Harald Ringvold 2021-03-20 21:09:58 +01:00
parent 8c940d5bd2
commit 9b59388a58
1 changed files with 2 additions and 1 deletions
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3
dyndns.sh
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@ -30,7 +30,8 @@ while ( true ); do
echo "Trying with $service..."
ip="$(curl -s $service)"
test -n "$ip" && break
valid_ip=$(echo $ip | grep '[0-9]\{1,3\}\(\.[0-9]\{1,3\}\)\{3\}')
test -n "$valid_ip" && break
done
echo "Found IP address $ip"