177 lines
3.9 KiB
Bash
Executable File
177 lines
3.9 KiB
Bash
Executable File
#!/bin/bash
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#
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# Generate OpenVPN configs
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#
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# Convert 1.2.3.4/24 -> 255.255.255.0
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cidr2mask()
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{
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local i
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local subnetmask=""
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local cidr=${1#*/}
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local full_octets=$(($cidr/8))
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local partial_octet=$(($cidr%8))
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for ((i=0;i<4;i+=1)); do
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if [ $i -lt $full_octets ]; then
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subnetmask+=255
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elif [ $i -eq $full_octets ]; then
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subnetmask+=$((256 - 2**(8-$partial_octet)))
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else
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subnetmask+=0
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fi
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[ $i -lt 3 ] && subnetmask+=.
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done
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echo $subnetmask
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}
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# Used often enough to justify a function
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getroute() {
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echo ${1%/*} $(cidr2mask $1)
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}
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usage() {
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echo "usage: $0 [-d]"
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echo " -u SERVER_PUBLIC_URL"
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echo " [-s SERVER_SUBNET]"
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echo " [-r ROUTE ...]"
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echo
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echo "optional arguments:"
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echo " -d Disable NAT routing and default route"
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echo " -c Enable client-to-client option"
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}
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set -ex
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OVPN_ENV=$OPENVPN/ovpn_env.sh
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OVPN_SERVER=192.168.255.0/24
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OVPN_DEFROUTE=1
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# Import defaults if present
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[ -r "$OVPN_ENV" ] && source "$OVPN_ENV"
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ORIG_OVPN_ROUTES=$OVPN_ROUTES
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OVPN_ROUTES=""
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# Parse arguments
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while getopts ":r:s:du:c" opt; do
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case $opt in
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r)
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if [ -n "$OVPN_ROUTES" ]; then
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OVPN_ROUTES+=" $OPTARG"
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else
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OVPN_ROUTES+="$OPTARG"
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fi
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;;
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s)
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OVPN_SERVER=$OPTARG
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;;
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d)
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OVPN_DEFROUTE=0
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;;
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u)
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OVPN_SERVER_URL=$OPTARG
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;;
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c)
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OVPN_CLIENT_TO_CLIENT=1
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;;
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\?)
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set +x
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echo "Invalid option: -$OPTARG" >&2
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usage
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exit 1
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;;
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:)
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set +x
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echo "Option -$OPTARG requires an argument." >&2
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usage
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exit 1
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;;
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esac
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done
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# Server name is in the form "udp://vpn.example.com:1194"
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if [[ "$OVPN_SERVER_URL" =~ ^((udp|tcp)://)?([0-9a-zA-Z\.]+)(:([0-9]+))?$ ]]; then
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OVPN_PROTO=${BASH_REMATCH[2]};
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OVPN_CN=${BASH_REMATCH[3]};
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OVPN_PORT=${BASH_REMATCH[5]};
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else
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set +x
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echo "Common name not specified, see '-u'"
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usage
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exit 1
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fi
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# Apply defaults
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[ -z "$OVPN_PROTO" ] && OVPN_PROTO=udp
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[ -z "$OVPN_PORT" ] && OVPN_PORT=1194
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if [ -z "$OVPN_ROUTES" ]; then
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if [ -n "$ORIG_OVPN_ROUTES" ]; then
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OVPN_ROUTES=$ORIG_OVPN_ROUTES
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else
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OVPN_ROUTES=192.168.254.0/24
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fi
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fi
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export OVPN_SERVER OVPN_ROUTES OVPN_DEFROUTE
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export OVPN_SERVER_URL OVPN_ENV OVPN_PROTO OVPN_CN OVPN_PORT
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export OVPN_CLIENT_TO_CLIENT
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# Preserve config
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if [ -f "$OVPN_ENV" ]; then
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bak_env=$OVPN_ENV.$(date +%s).bak
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echo "Backing up $OVPN_ENV -> $bak_env"
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mv "$OVPN_ENV" "$bak_env"
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fi
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export | grep OVPN_ > "$OVPN_ENV"
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conf=$OPENVPN/openvpn.conf
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if [ -f "$conf" ]; then
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bak=$conf.$(date +%s).bak
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echo "Backing up $conf -> $bak"
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mv "$conf" "$bak"
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fi
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cat > "$conf" <<EOF
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server $(getroute $OVPN_SERVER)
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verb 3
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#duplicate-cn
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key $EASYRSA_PKI/private/${OVPN_CN}.key
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ca $EASYRSA_PKI/ca.crt
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cert $EASYRSA_PKI/issued/${OVPN_CN}.crt
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dh $EASYRSA_PKI/dh.pem
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tls-auth $EASYRSA_PKI/ta.key
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key-direction 0
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keepalive 10 60
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persist-key
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persist-tun
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push "dhcp-option DNS 8.8.4.4"
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push "dhcp-option DNS 8.8.8.8"
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proto $OVPN_PROTO
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# Rely on Docker to do port mapping, internally always 1194
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port 1194
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dev tun0
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status /tmp/openvpn-status.log
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client-config-dir $OPENVPN/ccd
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EOF
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[ -n "$OVPN_CLIENT_TO_CLIENT" ] && echo "client-to-client" >> "$conf"
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# Append Routes
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for i in ${OVPN_ROUTES[@]}; do
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# If user passed "0" skip this, assume no extra routes
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[ "$i" = "0" ] && break;
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echo route $(getroute $i) >> "$conf"
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done
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# Clean-up duplicate configs (always return success)
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diff -q "$bak_env" "$OVPN_ENV" 2> /dev/null && rm "$bak_env" || true
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diff -q "$bak" "$conf" 2> /dev/null && rm "$bak" || true
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echo "Successfully generated config"
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