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1f82b5c2c4
* Make dnsmasq listen to the container network * Conditional Forwarding for NextDNS * Update nextdns.conf
99 lines
3.4 KiB
Bash
99 lines
3.4 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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IPV4_GW="10.0.5.1/24"
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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=nextdns
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## network configuration and startup:
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CNI_PATH=/mnt/data/podman/cni
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if [ ! -f "$CNI_PATH"/macvlan ]; then
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mkdir -p $CNI_PATH
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curl -L https://github.com/containernetworking/plugins/releases/download/v0.8.6/cni-plugins-linux-arm64-v0.8.6.tgz | tar -xz -C $CNI_PATH
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fi
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mkdir -p /opt/cni
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rm -f /opt/cni/bin
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ln -s $CNI_PATH /opt/cni/bin
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for file in "$CNI_PATH"/*.conflist
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do
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if [ -f "$file" ]; then
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ln -s "$file" "/etc/cni/net.d/$(basename "$file")"
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fi
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done
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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, if you have you can ignore this error
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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 DNAT --to ${IPV4_IP}"
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iptables -t nat -C ${prerouting_rule} || 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 DNAT --to ${IPV6_IP}"
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ip6tables -t nat -C ${prerouting_rule} || 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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