#!/usr/bin/env bash
## (c) 2023 th(at)bogus.net
##
## extremely hacky way to convert a pivpn wg client config file to ifconfig-syntax
## used by openbsd (e.g. put this into /etc/hostname.wg0)
##
while getopts "h?" opt
do
    case "$opt" in
        h|\?)
            echo "usage: $0 [-h] <file>"
            echo "or: cat <file> | $0"
            echo " -h : this"
            exit 0
            ;;
    esac
done
while read line
do
    if [[ $line =~ ^PrivateKey\ =\ (.+)$ ]]
    then
        WGKEY=${BASH_REMATCH[1]}
    fi
    if [[ $line =~ ^Address\ =\ ([[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+\/[[:digit:]]+)$ ]]
    then
        IFADDR=${BASH_REMATCH[1]}
    fi
    if [[ $line =~ ^PublicKey\ =\ (.+)$ ]]
    then
        WGPEER=${BASH_REMATCH[1]}
    fi
    if [[ $line =~ ^PresharedKey\ =\ (.+)$ ]]
    then
        WGPSK=${BASH_REMATCH[1]}
    fi
    if [[ $line =~ ^Endpoint\ =\ ([[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+)\:([[:digit:]]+)$ ]]
    then
        WGENDPOINTADDR=${BASH_REMATCH[1]}
        WGENDPOINTPORT=${BASH_REMATCH[2]}
    fi
    if [[ $line =~ ^AllowedIPs\ =\ (.*)$ ]]
    then
        ALLOWEDIPS=${BASH_REMATCH[1]}
    fi
done < "${1:-/dev/stdin}"

echo -n wgkey $WGKEY wgpeer $WGPEER wgpsk $WGPSK wgendpoint $WGENDPOINTADDR $WGENDPOINTPORT
for n in ${ALLOWEDIPS//,/ }
do
    echo -n \ wgaip $n
done
echo    
echo inet $IFADDR
echo up