#!/bin/bash

for i in `seq {{ proxy_ssh_tun_index_min }} 255`; do
    interface=tun${i}
    file=/etc/network/interfaces.d/$interface
    ln -s /dev/null "$file" 2>/dev/null
    if [[ $? -eq 0 ]]; then
        INTERFACE_ID=$i
        IP_SELF={{ proxy_ssh_ip_prefix }}${INTERFACE_ID}.2
        IP_PEER={{ proxy_ssh_ip_prefix }}${INTERFACE_ID}.1

        tmp=$(mktemp)
        cat <<EOF2 | sed -E 's/^ {8}//' | tee "$tmp" >/dev/null
        ## sshproxy
        #{ "router_hostname": "{{ ansible_hostname }}",
        #  "router_ip": "$IP_SELF",
        #  "target_hostname": "{{ item }}",
        #  "target_ip": "$IP_PEER",
        #  "interface_id": $INTERFACE_ID,
        #  "interface": "$interface"
        #}
EOF2
        mv -f "$tmp" "$file"

        break
    fi
done

if [[ -z "$INTERFACE_ID" ]]; then
    echo "ERR could not create tunnel interface" >&2
    exit 1
fi

set -e

ip tuntap add mode tun dev $interface
ip addr add $IP_SELF/30 peer $IP_PEER dev $interface
ip link set dev $interface up

grep -E "^#" "$file" | grep -vE "^##" | sed -E "s/^#//"