allanger/container-openvpn
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genconfig: Add getopts parsing

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* Pass public server URL via -u argument instead of $1
* Add ability to specify multiple alternative routes
* Add ability to specify override default server internal subnet
* Add ability to write configs without a default route out, not
  implemented in other configs yet
This commit is contained in:
Kyle Manna 2014-07-05 21:16:02 -07:00
parent 852d404c12
commit 6fe867c52b
1 changed files with 86 additions and 11 deletions
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97
bin/ovpn_genconfig
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@ -4,15 +4,82 @@
# Generate OpenVPN configs
#
# Convert 1.2.3.4/24 -> 255.255.255.0
cidr2mask()
{
local i
local subnetmask=""
local cidr=${1#*/}
local full_octets=$(($cidr/8))
local partial_octet=$(($cidr%8))
for ((i=0;i<4;i+=1)); do
if [ $i -lt $full_octets ]; then
subnetmask+=255
elif [ $i -eq $full_octets ]; then
subnetmask+=$((256 - 2**(8-$partial_octet)))
else
subnetmask+=0
fi
[ $i -lt 3 ] && subnetmask+=.
done
echo $subnetmask
}
# Used often enough to justify a function
getroute() {
echo ${1%/*} $(cidr2mask $1)
}
usage() {
echo "usage: $0 [-d]"
echo " -u SERVER_PUBLIC_URL"
echo " [-s SERVER_SUBNET]"
echo " [-r ROUTE ...]"
echo
echo "optional arguments:"
echo " -d Disable NAT routing and default route"
}
set -ex
OVPN_ENV=$OPENVPN/ovpn_env.sh
OVPN_SERVER=192.168.255.0/24
OVPN_DEFROUTE=1
# Import defaults if present
[ -r "$OVPN_ENV" ] && source "$OVPN_ENV"
# Override config if set
[ -n "$1" ] && OVPN_SERVER_URL="$1"
# Parse arguments
while getopts ":r:s:du:" opt; do
case $opt in
r)
OVPN_ROUTES+=" $OPTARG"
;;
s)
OVPN_SERVER=$OPTARG
;;
d)
OVPN_DEFROUTE=0
;;
u)
OVPN_SERVER_URL=$OPTARG
;;
\?)
set +x
echo "Invalid option: -$OPTARG" >&2
usage
exit 1
;;
:)
set +x
echo "Option -$OPTARG requires an argument." >&2
usage
exit 1
;;
esac
done
# Server name is in the form "udp://vpn.example.com:1194"
if [[ "$OVPN_SERVER_URL" =~ ^((udp|tcp)://)?([0-9a-zA-Z\.]+)(:([0-9]+))?$ ]]; then
@ -20,14 +87,19 @@ if [[ "$OVPN_SERVER_URL" =~ ^((udp|tcp)://)?([0-9a-zA-Z\.]+)(:([0-9]+))?$ ]]; th
OVPN_CN=${BASH_REMATCH[3]};
OVPN_PORT=${BASH_REMATCH[5]};
else
echo "Common name not specified"
set +x
echo "Common name not specified, see '-u'"
usage
exit 1
fi
# Apply defaults
[ -z "$OVPN_PROTO" ] && OVPN_PROTO=udp
[ -z "$OVPN_PORT" ] && OVPN_PORT=1194
[ -z "$OVPN_ROUTES" ] && OVPN_ROUTES=192.168.254.0/24
export OVPN_SERVER OVPN_ROUTES OVPN_DEFROUTE
export OVPN_SERVER_URL OVPN_ENV OVPN_PROTO OVPN_CN OVPN_PORT
# Preserve config
if [ -f "$OVPN_ENV" ]; then
@ -35,8 +107,7 @@ if [ -f "$OVPN_ENV" ]; then
echo "Backing up $OVPN_ENV -> $bak_env"
mv "$OVPN_ENV" "$bak_env"
fi
export OVPN_SERVER_URL OVPN_ENV OVPN_PROTO OVPN_CN OVPN_PORT
env | grep ^OVPN_ > "$OVPN_ENV"
export | grep OVPN_ > "$OVPN_ENV"
conf=$OPENVPN/openvpn.conf
if [ -f "$conf" ]; then
@ -46,12 +117,12 @@ if [ -f "$conf" ]; then
fi
cat > "$conf" <<EOF
server 192.168.255.0 255.255.255.0
server $(getroute $OVPN_SERVER)
verb 3
#duplicate-cn
key $EASYRSA_PKI/private/$OVPN_CN.key
key $EASYRSA_PKI/private/${OVPN_CN}.key
ca $EASYRSA_PKI/ca.crt
cert $EASYRSA_PKI/issued/$OVPN_CN.crt
cert $EASYRSA_PKI/issued/${OVPN_CN}.crt
dh $EASYRSA_PKI/dh.pem
tls-auth $EASYRSA_PKI/ta.key
key-direction 0
@ -61,15 +132,19 @@ persist-tun
push "dhcp-option DNS 8.8.4.4"
push "dhcp-option DNS 8.8.8.8"
client-config-dir $OPENVPN/ccd
route 192.168.254.0 255.255.255.0
proto $OVPN_PROTO
port $OVPN_PORT
dev tun0
status /tmp/openvpn-status.log
client-config-dir $OPENVPN/ccd
EOF
# Append Routes
for i in ${OVPN_ROUTES[@]}; do
echo route $(getroute $i) >> "$conf"
done
# Clean-up duplicate configs (always return success)
diff -q "$bak_env" "$OVPN_ENV" 2> /dev/null && rm "$bak_env" || true
diff -q "$bak" "$conf" 2> /dev/null && rm "$bak" || true