#!/bin/sh

set -e

cleanup()
{
    (
        ip netns del ns1
        ip link delete veth0
        ip link delete veth1
        nmcli connection delete veth0+
        killall dnsmasq
    ) 2>/dev/null || true
}

check_address()
{
    if [ $(ip -j addr show veth0 | jq -r .[0].addr_info[0].local | wc -l) != 1 ]; then
        echo "Error: address not configured"
        ip addr show veth0
        exit 1
    fi
}

cleanup

echo "* setup..."

ip netns add ns1
ip link add veth0 type veth peer netns ns1 name veth1
ip link set veth0 up
ip -n ns1 link set veth1 up
ip -n ns1 addr add dev veth1 172.25.10.1/24

ip netns exec ns1 dnsmasq --bind-interfaces --interface veth1 -d --dhcp-range=172.25.10.100,172.25.10.200,60 &

echo "* activate connection..."

nmcli connection add type ethernet ifname veth0 con-name veth0+ ipv6.method disabled connection.autoconnect no
nmcli connection up veth0+

check_address

echo "* wait expiry..."

killall dnsmasq

for i in $(seq 1 122); do
    sleep 1
    echo "   - after $i seconds: $(ip -j addr show veth0 | jq -r '.[0].addr_info[0].local,.[0].addr_info[0].valid_life_time' | tr '\n' ' ')"
done

echo "* restart DHCP server..."
ip netns exec ns1 dnsmasq --bind-interfaces --interface veth1 -d --dhcp-range=172.25.10.100,172.25.10.200,60 &

for i in $(seq 1 20); do
    sleep 1
    echo "   - after $i seconds: $(ip -j addr show veth0 | jq -r '.[0].addr_info[0].local,.[0].addr_info[0].valid_life_time' | tr '\n' ' ')"
done