mirror of
https://github.com/AuxXxilium/arv-v-dsm.git
synced 2024-11-23 23:10:58 +07:00
94 lines
3.5 KiB
Bash
94 lines
3.5 KiB
Bash
#!/usr/bin/env bash
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set -eu
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: ${VM_NET_TAP:=''}
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: ${VM_NET_IP:='20.20.20.21'}
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: ${VM_NET_HOST:='VirtualDSM'}
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: ${VM_NET_MAC:='02:11:32:AA:BB:CC'}
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: ${DNS_SERVERS:=''}
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: ${DNSMASQ:='/usr/sbin/dnsmasq'}
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: ${DNSMASQ_OPTS:=''}
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: ${DNSMASQ_CONF_DIR:='/etc/dnsmasq.d'}
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# ######################################
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# Functions
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# ######################################
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# Setup macvtap device to connect later the VM and setup a new macvlan device to connect the host machine to the network
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configureNatNetworks () {
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#Create bridge with static IP for the VM guest
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brctl addbr dockerbridge
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ip addr add ${VM_NET_IP%.*}.1/24 broadcast ${VM_NET_IP%.*}.255 dev dockerbridge
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ip link set dockerbridge up
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#QEMU Works with taps, set tap to the bridge created
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ip tuntap add dev ${VM_NET_TAP} mode tap
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ip link set ${VM_NET_TAP} up promisc on
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brctl addif dockerbridge ${VM_NET_TAP}
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#Add internet connection to the VM
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iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
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iptables -t nat -A PREROUTING -i eth0 -p tcp -j DNAT --to $VM_NET_IP
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iptables -t nat -A PREROUTING -i eth0 -p udp -j DNAT --to $VM_NET_IP
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#Enable port forwarding flag
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[[ $(< /proc/sys/net/ipv4/ip_forward) -eq 0 ]] && sysctl -w net.ipv4.ip_forward=1
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# dnsmasq configuration:
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DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-range=$VM_NET_IP,$VM_NET_IP --dhcp-host=$VM_NET_MAC,,$VM_NET_IP,$VM_NET_HOST,infinite --dhcp-option=option:netmask,255.255.255.0"
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# Create lease file for faster resolve
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echo "0 $VM_NET_MAC $VM_NET_IP $VM_NET_HOST 01:${VM_NET_MAC}" > /var/lib/misc/dnsmasq.leases
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chmod 644 /var/lib/misc/dnsmasq.leases
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}
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# ######################################
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# Configure Network
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# ######################################
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# Create the necessary file structure for /dev/net/tun
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if [ ! -c /dev/net/tun ]; then
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[ ! -d /dev/net ] && mkdir -m 755 /dev/net
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mknod /dev/net/tun c 10 200
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chmod 666 /dev/net/tun
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fi
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[ ! -c /dev/net/tun ] && echo "Error: TUN network interface not available..." && exit 85
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update-alternatives --set iptables /usr/sbin/iptables-legacy > /dev/null
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update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy > /dev/null
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VM_NET_TAP="_VmNatTap"
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configureNatNetworks
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KVM_NET_OPTS="-netdev tap,ifname=${VM_NET_TAP},script=no,downscript=no,id=hostnet0"
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# Build DNS options from container /etc/resolv.conf
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nameservers=($(grep '^nameserver' /etc/resolv.conf | sed 's/nameserver //'))
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searchdomains=$(grep '^search' /etc/resolv.conf | sed 's/search //' | sed 's/ /,/g')
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domainname=$(echo $searchdomains | awk -F"," '{print $1}')
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for nameserver in "${nameservers[@]}"; do
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if ! [[ $nameserver =~ .*:.* ]]; then
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[[ -z $DNS_SERVERS ]] && DNS_SERVERS=$nameserver || DNS_SERVERS="$DNS_SERVERS,$nameserver"
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fi
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done
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[[ -z $DNS_SERVERS ]] && DNS_SERVERS="1.1.1.1"
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[[ ${DNS_SERVERS} != *","* ]] && DNS_SERVERS="$DNS_SERVERS,1.0.0.1"
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DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:dns-server,$DNS_SERVERS --dhcp-option=option:router,${VM_NET_IP%.*}.1"
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if [ -n "$searchdomains" -a "$searchdomains" != "." ]; then
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DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-search,$searchdomains --dhcp-option=option:domain-name,$domainname"
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else
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[[ -z $(hostname -d) ]] || DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-name,$(hostname -d)"
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fi
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$DNSMASQ $DNSMASQ_OPTS
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KVM_NET_OPTS="${KVM_NET_OPTS} -device virtio-net-pci,romfile=,netdev=hostnet0,mac=${VM_NET_MAC},id=net0"
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# Hack for guest VMs complaining about "bad udp checksums in 5 packets"
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iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill
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