Unverified Commit 2b8e24e4 authored by Kroese's avatar Kroese Committed by GitHub
Browse files

Simplify network code

parent dbaa59e0

network.sh

+6 −44
Original line number Diff line number Diff line 
#!/usr/bin/env bash

set -eu



: ${INFO:='N'}

: ${DEBUG:='N'}

: ${VM_NET_TAP:=''}

: ${VM_NET_IP:='20.20.20.21'}

: ${VM_NET_MAC:='00:11:32:2C:A7:85'}



: ${DNSMASQ:='/usr/sbin/dnsmasq'}

: ${DNSMASQ_OPTS:=''}

: ${DNSMASQ_CONF_DIR:='/etc/dnsmasq.d'}

: ${DNS_SERVERS:=''}



: ${VM_NET_TAP:=''}

: ${VM_NET_IP:='20.20.20.21'}

: ${VM_NET_MAC:='00:11:32:2C:A7:85'}



# ######################################

#  Functions

# ######################################



log () {

  case "$1" in

    WARNING | ERROR )

      echo "$1: ${@:2}"

      ;;

    INFO)

      if [[ "$INFO" == [Yy1]* ]]; then

          echo "$1: ${@:2}"

      fi

      ;;

    DEBUG)

      if [[ "$DEBUG" == [Yy1]* ]]; then

          echo "$1: ${@:2}"

      fi

      ;;

    *)

      echo "-- $@"

      ;;

  esac

}



setupLocalDhcp () {

  CIDR="24"

  MAC="$1"

  IP="$2"

  HOSTNAME="VirtualDSM"

  # dnsmasq configuration:

  log "DEBUG" "DHCP configured to serve IP $IP/$CIDR via dockerbridge"

  DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-range=$IP,$IP --dhcp-host=$MAC,,$IP,$HOSTNAME,infinite --dhcp-option=option:netmask,255.255.255.0"

  # Create lease file for faster resolve

  echo "0 $MAC $IP $HOSTNAME 01:${MAC}" > /var/lib/misc/dnsmasq.leases
@@ -55,8 +30,7 @@ setupLocalDhcp () { 
# to connect the host machine to the network

configureNatNetworks () {



  #For now we define static MAC because DHCP is very slow if MAC change every VM Boot

  #Create bridge with static IP for the VM Guest (Connection VM-Docker)

  #Create bridge with static IP for the VM guest 

  brctl addbr dockerbridge

  ip addr add ${VM_NET_IP%.*}.1/24 broadcast ${VM_NET_IP%.*}.255 dev dockerbridge

  ip link set dockerbridge up
@@ -73,7 +47,6 @@ configureNatNetworks () { 
  #Enable port forwarding flag

  [[ $(< /proc/sys/net/ipv4/ip_forward) -eq 0 ]] && sysctl -w net.ipv4.ip_forward=1



  #For now we define static MAC because DHCP is very slow if DHCP change every VM Boot

  setupLocalDhcp $VM_NET_MAC $VM_NET_IP

}
@@ -90,16 +63,10 @@ fi 


[ ! -c /dev/net/tun ] && echo "Error: TUN network interface not available..." && exit 85



#log "INFO" "Little dirty trick ..."

update-alternatives --set iptables /usr/sbin/iptables-legacy > /dev/null

update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy > /dev/null



log "INFO" "Configuring network ..."

#DEFAULT_ROUTE=$(ip route | grep default | awk '{print $3}')



VM_NET_TAP="_VmNatTap"

log "INFO" "... NAT Network (${VM_NET_TAP}) to ${VM_NET_IP}"



configureNatNetworks

KVM_NET_OPTS="-netdev tap,ifname=${VM_NET_TAP},script=no,downscript=no,id=hostnet0"
@@ -110,7 +77,7 @@ domainname=$(echo $searchdomains | awk -F"," '{print $1}') 


for nameserver in "${nameservers[@]}"; do

  if [[ $nameserver =~ .*:.* ]]; then

    log "INFO" "Skipping IPv6 nameserver: $nameserver"

    echo "Skipping IPv6 nameserver: $nameserver"

  else

    [[ -z $DNS_SERVERS ]] && DNS_SERVERS=$nameserver || DNS_SERVERS="$DNS_SERVERS,$nameserver"

  fi
@@ -124,14 +91,9 @@ DNSMASQ_OPTS="$DNSMASQ_OPTS \ 


[[ -z $(hostname -d) ]] || DNSMASQ_OPTS="$DNSMASQ_OPTS --dhcp-option=option:domain-name,$(hostname -d)"



log "INFO" "... Lauching dnsmasq"

log "DEBUG" "dnsmasq options: $DNSMASQ_OPTS"

$DNSMASQ $DNSMASQ_OPTS

	

KVM_NET_OPTS="${KVM_NET_OPTS} -device virtio-net-pci,netdev=hostnet0,mac=${VM_NET_MAC},id=net0" 



# Hack for guest VMs complaining about "bad udp checksums in 5 packets"

iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill \

        || ( log "WARNING" "Iptables hack for checksum FAILED" && ethtool -K eth0 tx off || true )



log "INFO" "Done setting up network.."
 
iptables -A POSTROUTING -t mangle -p udp --dport bootpc -j CHECKSUM --checksum-fill