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https://github.com/unifi-utilities/unifios-utilities.git
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95 lines
4.1 KiB
Bash
95 lines
4.1 KiB
Bash
#!/bin/sh
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## configuration variables:
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VLAN=5
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IPV4_IP="10.0.5.3"
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# This is the IP address of the container. You may want to set it to match
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# your own network structure such as 192.168.5.3 or similar.
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IPV4_GW="10.0.5.1/24"
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# As above, this should match the gateway of the VLAN for the container
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# network as above which is usually the .1/24 range of the IPV4_IP
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# if you want IPv6 support, generate a ULA, select an IP for the dns server
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# and an appropriate gateway address on the same /64 network. Make sure that
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# the 20-dns.conflist is updated appropriately. It will need the IP and GW
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# added along with a ::/0 route. Also make sure that additional --dns options
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# are passed to podman with your IPv6 DNS IPs when deploying the container for
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# the first time. You will also need to configure your VLAN to have a static
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# IPv6 block.
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# IPv6 Also works with Prefix Delegation from your provider. The gateway is the
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# IP of br(VLAN) and you can pick any ip address within that subnet that dhcpv6
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# isn't serving
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IPV6_IP=""
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IPV6_GW=""
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# set this to the interface(s) on which you want DNS TCP/UDP port 53 traffic
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# re-routed through the DNS container. separate interfaces with spaces.
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# e.g. "br0" or "br0 br1" etc.
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FORCED_INTFC=""
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# container name; e.g. nextdns, pihole, adguardhome, etc.
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CONTAINER=pihole
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if ! test -f /opt/cni/bin/macvlan; then
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echo "Error: CNI plugins not found. You can install it with the following command:" >&2
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echo " curl -fsSLo /mnt/data/on_boot.d/05-install-cni-plugins.sh https://raw.githubusercontent.com/boostchicken-dev/udm-utilities/main/cni-plugins/05-install-cni-plugins.sh && /bin/sh /mnt/data/on_boot.d/05-install-cni-plugins.sh" >&2
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exit 1
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fi
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# set VLAN bridge promiscuous
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ip link set "br${VLAN}" promisc on
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# create macvlan bridge and add IPv4 IP
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ip link add "br${VLAN}.mac" link "br${VLAN}" type macvlan mode bridge
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ip addr add "${IPV4_GW}" dev "br${VLAN}.mac" noprefixroute
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# (optional) add IPv6 IP to VLAN bridge macvlan bridge
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if [ -n "${IPV6_GW}" ]; then
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ip -6 addr add "${IPV6_GW}" dev "br${VLAN}.mac" noprefixroute
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fi
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# set macvlan bridge promiscuous and bring it up
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ip link set "br${VLAN}.mac" promisc on
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ip link set "br${VLAN}.mac" up
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# add IPv4 route to DNS container
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ip route add "${IPV4_IP}/32" dev "br${VLAN}.mac"
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# (optional) add IPv6 route to DNS container
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if [ -n "${IPV6_IP}" ]; then
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ip -6 route add "${IPV6_IP}/128" dev "br${VLAN}.mac"
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fi
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# Make DNSMasq listen to the container network for split horizon or conditional forwarding
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if ! grep -qxF "interface=br${VLAN}.mac" /run/dnsmasq.conf.d/custom.conf; then
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echo "interface=br${VLAN}.mac" >> /run/dnsmasq.conf.d/custom.conf
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kill -9 "$(cat /run/dnsmasq.pid)"
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fi
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if podman container exists "${CONTAINER}"; then
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podman start "${CONTAINER}"
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else
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logger -s -t podman-dns -p "ERROR Container ${CONTAINER} not found, make sure you set the proper name, you can ignore this error if it is your first time setting it up"
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fi
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# (optional) IPv4 force DNS (TCP/UDP 53) through DNS container
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for intfc in ${FORCED_INTFC}; do
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if [ -d "/sys/class/net/${intfc}" ]; then
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for proto in udp tcp; do
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prerouting_rule="PREROUTING -i ${intfc} -p ${proto} ! -s ${IPV4_IP} ! -d ${IPV4_IP} --dport 53 -j LOG --log-prefix [DNAT-${intfc}-${proto}]"
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iptables -t nat -C ${prerouting_rule} 2>/dev/null || iptables -t nat -A ${prerouting_rule}
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prerouting_rule="PREROUTING -i ${intfc} -p ${proto} ! -s ${IPV4_IP} ! -d ${IPV4_IP} --dport 53 -j DNAT --to ${IPV4_IP}"
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iptables -t nat -C ${prerouting_rule} 2>/dev/null || iptables -t nat -A ${prerouting_rule}
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# (optional) IPv6 force DNS (TCP/UDP 53) through DNS container
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if [ -n "${IPV6_IP}" ]; then
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prerouting_rule="PREROUTING -i ${intfc} -p ${proto} ! -s ${IPV6_IP} ! -d ${IPV6_IP} --dport 53 -j LOG --log-prefix [DNAT-${intfc}-${proto}]"
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ip6tables -t nat -C ${prerouting_rule} 2>/dev/null || ip6tables -t nat -A ${prerouting_rule}
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prerouting_rule="PREROUTING -i ${intfc} -p ${proto} ! -s ${IPV6_IP} ! -d ${IPV6_IP} --dport 53 -j DNAT --to ${IPV6_IP}"
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ip6tables -t nat -C ${prerouting_rule} 2>/dev/null || ip6tables -t nat -A ${prerouting_rule}
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fi
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done
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fi
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done
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