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Improve IP detection

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- Remove unneeded code for Amazon EC2
- Check IPs for correct format after each try
This commit is contained in:
hwdsl2 2016-09-09 15:33:12 -05:00
parent 6d4bad1fd2
commit 7937a74469
2 changed files with 20 additions and 16 deletions
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18
vpnsetup.sh
View File

@ -119,22 +119,24 @@ EOF
PUBLIC_IP=${VPN_PUBLIC_IP:-''}
PRIVATE_IP=${VPN_PRIVATE_IP:-''}
# In Amazon EC2, these two variables will be retrieved from metadata
[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 5 -qO- 'http://169.254.169.254/latest/meta-data/public-ipv4')
[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(wget -t 3 -T 5 -qO- 'http://169.254.169.254/latest/meta-data/local-ipv4')
# Try to find IPs for non-EC2 servers
# Try to auto discover IPs of this server
[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://whatismyip.akamai.com)
[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ip -4 route get 1 | awk '{print $NF;exit}')
[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
# Check IPs for correct format
IP_REGEX="^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then
PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://whatismyip.akamai.com)
fi
if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then
PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
fi
if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then
exiterr "Cannot find valid public IP. Edit the script and manually enter IPs."
fi
if ! printf %s "$PRIVATE_IP" | grep -Eq "$IP_REGEX"; then
PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
fi
if ! printf %s "$PRIVATE_IP" | grep -Eq "$IP_REGEX"; then
exiterr "Cannot find valid private IP. Edit the script and manually enter IPs."
fi

18
vpnsetup_centos.sh
View File

@ -106,22 +106,24 @@ EOF
PUBLIC_IP=${VPN_PUBLIC_IP:-''}
PRIVATE_IP=${VPN_PRIVATE_IP:-''}
# In Amazon EC2, these two variables will be retrieved from metadata
[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 5 -qO- 'http://169.254.169.254/latest/meta-data/public-ipv4')
[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(wget -t 3 -T 5 -qO- 'http://169.254.169.254/latest/meta-data/local-ipv4')
# Try to find IPs for non-EC2 servers
# Try to auto discover IPs of this server
[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://whatismyip.akamai.com)
[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ip -4 route get 1 | awk '{print $NF;exit}')
[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
# Check IPs for correct format
IP_REGEX="^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then
PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://whatismyip.akamai.com)
fi
if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then
PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
fi
if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then
exiterr "Cannot find valid public IP. Edit the script and manually enter IPs."
fi
if ! printf %s "$PRIVATE_IP" | grep -Eq "$IP_REGEX"; then
PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
fi
if ! printf %s "$PRIVATE_IP" | grep -Eq "$IP_REGEX"; then
exiterr "Cannot find valid private IP. Edit the script and manually enter IPs."
fi