#!/bin/sh
h=marble.tj5tzswz7isfavggdjsiwxdjswrg6tadlzuf3j3q.ed25519.cryptonomic.net 
n=andy

key_basename=ssh_host_rsa_key
input_key=/etc/ssh/$key_basename

keycopy()
{
	openssl rsa -in "$input_key"         -outform DER > /etc/swanctl/private/"$key_basename"
	openssl rsa -in "$input_key" -pubout -outform DER > /etc/swanctl/pubkey/"$key_basename".pub

	t=$(mktemp)
	ssh-keyscan -trsa "$h" | while read hh rest; do [ "$h" = "$hh" ] && printf '%s\n' "$rest"; done

	ssh-keygen -e -f rsa.scan.edit -m PEM | openssl rsa -RSAPublicKey_in -outform DER > /etc/swanctl/pubkey/"$n".pub

	ls -l /etc/swanctl/private/"$key_basename" /etc/swanctl/pubkey/"$key_basename".pub /etc/swanctl/pubkey/"$n".pub
}

nocomments()
{
	sed 's/#.*//; /^ *$/d'
}


write_config()
{
	conn=$1
	remote_addrs=$2
	id=$3
	cat > /etc/swanctl/conf.d/"$conn".conf <<END
connections {
    ${conn} {
        remote_addrs = ${remote_addrs}
        vips = ::
        local {
            pubkeys = ssh_host_rsa_key.pub
            auth = pubkey
            id = ${id}
        }
        remote {
            id = "${remote_addrs}"
            pubkeys = ${conn}.pub
            auth = pubkey
        }
        children {
            child {
                remote_ts = 0::0/0
                mode = tunnel
                dpd_action = restart
            }
        }
    }
}
secrets {
    private1 {
        file = ssh_host_rsa_key
    }
}
END
}

test_new_config()
{
	ipsec stop

	yourip=68.48.18.140
	iface=$(ip -oneline route get "$yourip"  | sed -ne 's/.* dev \([^ ]*\) .*/\1/p')
	[ "$iface" ] || return
	mymac=$(ip -oneline -6 addr  show dev "$iface" | sed -ne 's/.* inet6 fe80::\([^/]*\)\/.*/\1/p')
	[ "$mymac" ] || return

	write_config andy "$yourip" "$mymac"

	ipsec start
	sleep 2
	swanctl -c
	ipsec listpubkeys
	ipsec up andy
}

test_new_config