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Improve NAT detection

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Cleaner and better:
- Not relying in an external service
- Avoids a false positive when the server has multiple public IPv4
addresses and the user selects one which is not the default gateway
This commit is contained in:
Nyr 2018-04-21 21:06:41 +02:00
parent ff254aeb1e
commit 83234ddae4
1 changed files with 4 additions and 6 deletions
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10
openvpn-install.sh
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@ -175,13 +175,11 @@ else
# Autodetect IP address and pre-fill for the user
IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
read -p "IP address: " -e -i $IP IP
# Try to detect a NATed connection and ask the user about it
EXTERNALIP=$(wget -4qO- "http://whatismyip.akamai.com/" 2>/dev/null || curl -4s "http://whatismyip.akamai.com/")
if [[ "$IP" != "$EXTERNALIP" ]]; then
# If $IP is a private IP address, the server must be behind NAT
if echo "$IP" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
echo
echo "If your server is behind NAT, please provide the public IP address or hostname."
echo "If that's not the case, just ignore this and leave the next field blank."
read -p "Public IP address / Hostname: " -e PUBLICIP
echo "This server is behind NAT. What is the public IPv4 address or hostname?"
read -p "Public IP address / hostname: " -e PUBLICIP
fi
echo
echo "Which protocol do you want for OpenVPN connections?"