[WIP] Private networks

README.md

@@ -27,6 +27,7 @@ will be coming along _soon_.
 * [Vagrant 1.1+](http://www.vagrantup.com/downloads.html)
 * lxc 0.7.5+
 * `redir` (if you are planning to use port forwarding)
+* `brctl` (if you are planning to use private networks, on Ubuntu this means `apt-get install bridge-utils`)
 * A [kernel != 3.5.0-17.28](https://github.com/fgrehm/vagrant-lxc/wiki/Troubleshooting#wiki-im-unable-to-restart-containers)
 
 The plugin is known to work better and pretty much out of the box on Ubuntu 14.04+

lib/vagrant-lxc/action.rb

@@ -11,6 +11,7 @@
 require 'vagrant-lxc/action/handle_box_metadata'
 require 'vagrant-lxc/action/prepare_nfs_settings'
 require 'vagrant-lxc/action/prepare_nfs_valid_ids'
+require 'vagrant-lxc/action/private_networks'
 require 'vagrant-lxc/action/remove_temporary_files'
 require 'vagrant-lxc/action/setup_package_files'
 require 'vagrant-lxc/action/warn_networks'
@@ -71,6 +72,7 @@ def self.action_boot
           b.use ForwardPorts
           b.use Boot
           b.use Builtin::WaitForCommunicator
+          b.use PrivateNetworks
         end
       end
 

lib/vagrant-lxc/action/private_networks.rb

@@ -0,0 +1,60 @@
+module Vagrant
+  module LXC
+    module Action
+      class PrivateNetworks
+        def initialize(app, env)
+          @app = app
+        end
+
+        def call(env)
+          @app.call(env)
+
+          if private_network_configured?(env[:machine].config)
+            configure_private_networks(env)
+          end
+        end
+
+        def private_network_configured?(config)
+          config.vm.networks.find do |type, _|
+            type.to_sym == :private_network
+          end
+        end
+
+        def configure_private_networks(env)
+          env[:machine].config.vm.networks.find do |type, config|
+            next if type.to_sym != :private_network
+
+            container_name = env[:machine].provider.driver.container_name
+            ip             = config[:ip]
+            configure_single_network('br1', container_name, ip)
+          end
+        end
+
+        def configure_single_network(bridge, container_name, ip)
+          cmd = [
+            'sudo',
+            Vagrant::LXC.source_root.join('scripts/private-network').to_s,
+            bridge,
+            container_name,
+            "#{ip}/24"
+          ]
+          puts cmd.join(' ')
+          system cmd.join(' ')
+
+          cmd = [
+            'sudo',
+            'ip',
+            'addr',
+            'add',
+            # TODO: This should not be hard coded and has to run once per bridge
+            "192.168.1.254/24",
+            'dev',
+            bridge
+          ]
+          puts cmd.join(' ')
+          system cmd.join(' ')
+        end
+      end
+    end
+  end
+end

lib/vagrant-lxc/action/warn_networks.rb

@@ -7,16 +7,16 @@ def initialize(app, env)
         end
 
         def call(env)
-          if public_or_private_network_configured?(env[:machine].config)
+          if public_network_configured?(env[:machine].config)
             env[:ui].warn(I18n.t("vagrant_lxc.messages.warn_networks"))
           end
 
           @app.call(env)
         end
 
-        def public_or_private_network_configured?(config)
+        def public_network_configured?(config)
           config.vm.networks.find do |type, _|
-            [:private_network, :public_network].include?(type.to_sym)
+            type.to_sym == :public_network
           end
         end
       end

locales/en.yml

@@ -13,9 +13,8 @@ en:
       force_shutdown: |-
         Forcing shutdown of container...
       warn_networks: |-
-        Warning! The LXC provider doesn't support any of the Vagrant public / private
-        network configurations (ex: `config.vm.network :private_network, ip: "some-ip"`).
-        They will be silently ignored.
+        Warning! The LXC provider doesn't support public networks, the settings
+        will be silently ignored.
       warn_group: |-
         Warning! The LXC provider doesn't support the :group parameter for synced
         folders. It will be silently ignored.

scripts/private-network

@@ -0,0 +1,193 @@
+#!/bin/bash
+
+# This is a snapshot of https://github.com/jpetazzo/pipework/blob/edbd33ab49ab0dff0bee46b019055360f325a6e5/pipework
+# with docker specifics trimmed out
+
+set -e
+
+case "$1" in
+  --wait)
+    WAIT=1
+    ;;
+esac
+
+IFNAME=$1
+if [ "$2" == "-i" ]; then
+  CONTAINER_IFNAME=$3
+  shift 2
+else
+  CONTAINER_IFNAME=eth1
+fi
+GUESTNAME=$2
+IPADDR=$3
+MACADDR=$4
+
+[ "$WAIT" ] && {
+  while ! grep -q ^1$ /sys/class/net/$CONTAINER_IFNAME/carrier 2>/dev/null
+    do sleep 1
+  done
+  exit 0
+}
+
+[ "$IPADDR" ] || {
+  echo "Syntax:"
+  echo "pipework <hostinterface> [-i containerinterface] <guest> <ipaddr>/<subnet>[@default_gateway] [macaddr]"
+  echo "pipework <hostinterface> [-i containerinterface] <guest> dhcp [macaddr]"
+  echo "pipework --wait"
+  exit 1
+}
+
+# First step: determine type of first argument (bridge, physical interface...)
+if [ -d /sys/class/net/$IFNAME ]
+then
+  if [ -d /sys/class/net/$IFNAME/bridge ]
+  then
+    IFTYPE=bridge
+    BRTYPE=linux
+  elif $(which ovs-vsctl >/dev/null) && $(ovs-vsctl list-br|grep -q ^$IFNAME$)
+  then
+    IFTYPE=bridge
+    BRTYPE=openvswitch
+  else IFTYPE=phys
+  fi
+else
+  case "$IFNAME" in
+    br*)
+      IFTYPE=bridge
+      BRTYPE=linux
+      ;;
+    *)
+      echo "I do not know how to setup interface $IFNAME."
+      exit 1
+      ;;
+  esac
+fi
+
+# Second step: find the guest
+while read dev mnt fstype options dump fsck
+do
+  [ "$fstype" != "cgroup" ] && continue
+  echo $options | grep -qw devices || continue
+  CGROUPMNT=$mnt
+done < /proc/mounts
+
+[ "$CGROUPMNT" ] || {
+  echo "Could not locate cgroup mount point."
+  exit 1
+}
+
+# Try to find a cgroup matching exactly the provided name.
+N=$(find "$CGROUPMNT" -name "$GUESTNAME" | wc -l)
+case "$N" in
+  0)
+    echo "Container $GUESTNAME not found."
+    exit 1
+    ;;
+  1)
+    true
+    ;;
+  *)
+    echo "Found more than one container matching $GUESTNAME."
+    exit 1
+    ;;
+esac
+
+if [ "$IPADDR" = "dhcp" ]
+then
+  # Check for first available dhcp client
+  DHCP_CLIENT_LIST="udhcpc dhcpcd dhclient"
+  for CLIENT in $DHCP_CLIENT_LIST; do
+    which $CLIENT >/dev/null && {
+      DHCP_CLIENT=$CLIENT
+      break
+    }
+  done
+  [ -z $DHCP_CLIENT ] && {
+    echo "You asked for DHCP; but no DHCP client could be found."
+    exit 1
+  }
+else
+  # Check if a subnet mask was provided.
+  echo $IPADDR | grep -q / || {
+    echo "The IP address should include a netmask."
+    echo "Maybe you meant $IPADDR/24 ?"
+    exit 1
+  }
+  # Check if a gateway address was provided.
+  if echo $IPADDR | grep -q @
+  then
+    GATEWAY=$(echo $IPADDR | cut -d@ -f2)
+    IPADDR=$(echo $IPADDR | cut -d@ -f1)
+  else
+    GATEWAY=
+  fi
+fi
+
+NSPID=$(head -n 1 $(find "$CGROUPMNT" -name "$GUESTNAME" | head -n 1)/tasks)
+[ "$NSPID" ] || {
+  echo "Could not find a process inside container $GUESTNAME."
+  exit 1
+}
+
+[ ! -d /var/run/netns ] && mkdir -p /var/run/netns
+[ -f /var/run/netns/$NSPID ] && rm -f /var/run/netns/$NSPID
+ln -s /proc/$NSPID/ns/net /var/run/netns/$NSPID
+
+
+# Check if we need to create a bridge.
+[ $IFTYPE = bridge ] && [ ! -d /sys/class/net/$IFNAME ] && {
+  (ip link set $IFNAME type bridge > /dev/null 2>&1) || (brctl addbr $IFNAME)
+  ip link set $IFNAME up
+}
+
+# If it's a bridge, we need to create a veth pair
+[ $IFTYPE = bridge ] && {
+  LOCAL_IFNAME=pl$NSPID$CONTAINER_IFNAME
+  GUEST_IFNAME=pg$NSPID$CONTAINER_IFNAME
+  ip link add name $LOCAL_IFNAME type veth peer name $GUEST_IFNAME
+  case "$BRTYPE" in
+    linux)
+      (ip link set $LOCAL_IFNAME master $IFNAME > /dev/null 2>&1) || (brctl addif $IFNAME $LOCAL_IFNAME)
+      ;;
+    openvswitch)
+      ovs-vsctl add-port $IFNAME $LOCAL_IFNAME
+      ;;
+  esac
+  ip link set $LOCAL_IFNAME up
+}
+
+# If it's a physical interface, create a macvlan subinterface
+[ $IFTYPE = phys ] && {
+  GUEST_IFNAME=ph$NSPID$CONTAINER_IFNAME
+  ip link add link $IFNAME dev $GUEST_IFNAME type macvlan mode bridge
+  ip link set $IFNAME up
+}
+
+ip link set $GUEST_IFNAME netns $NSPID
+ip netns exec $NSPID ip link set $GUEST_IFNAME name $CONTAINER_IFNAME
+[ "$MACADDR" ] && ip netns exec $NSPID ip link set $CONTAINER_IFNAME address $MACADDR
+if [ "$IPADDR" = "dhcp" ]
+then
+  [ $DHCP_CLIENT = "udhcpc"  ] && ip netns exec $NSPID $DHCP_CLIENT -qi $CONTAINER_IFNAME
+  [ $DHCP_CLIENT = "dhclient"  ] && ip netns exec $NSPID $DHCP_CLIENT $CONTAINER_IFNAME
+  [ $DHCP_CLIENT = "dhcpcd"  ] && ip netns exec $NSPID $DHCP_CLIENT -q $CONTAINER_IFNAME
+else
+  ip netns exec $NSPID ip addr add $IPADDR dev $CONTAINER_IFNAME
+  [ "$GATEWAY" ] && {
+    ip netns exec $NSPID ip route delete default >/dev/null 2>&1 && true
+  }
+  ip netns exec $NSPID ip link set $CONTAINER_IFNAME up
+  [ "$GATEWAY" ] && {
+    ip netns exec $NSPID ip route replace default via $GATEWAY
+  }
+fi
+
+# Give our ARP neighbors a nudge about the new interface
+if which arping > /dev/null 2>&1
+then
+  IPADDR=$(echo $IPADDR | cut -d/ -f1)
+  ip netns exec $NSPID arping -c 1 -A -I $CONTAINER_IFNAME $IPADDR > /dev/null 2>&1
+else
+  echo "Warning: arping not found; interface may not be immediately reachable"
+fi
+exit 0