Add ipv4_only option to limit connecting to guest IPv4 addresses only

Author: camjjack

plugins/providers/hyperv/action/wait_for_ip_address.rb

@@ -12,9 +12,13 @@ def initialize(app, env)
 
         def call(env)
           timeout = env[:machine].provider_config.ip_address_timeout
+          ipv4_only = env[:machine].provider_config.ipv4_only
 
           env[:ui].output("Waiting for the machine to report its IP address...")
           env[:ui].detail("Timeout: #{timeout} seconds")
+          if ipv4_only
+            env[:ui].detail("Waiting for IPv4 address only")
+          end
 
           guest_ip = nil
           Timeout.timeout(timeout) do
@@ -29,8 +33,8 @@ def call(env)
 
                 if guest_ip
                   begin
-                    IPAddr.new(guest_ip)
-                    break
+                    ip = IPAddr.new(guest_ip)
+                    break unless ipv4_only && !ip.ipv4?()
                   rescue IPAddr::InvalidAddressError
                     # Ignore, continue looking.
                     @logger.warn("Invalid IP address returned: #{guest_ip}")

plugins/providers/hyperv/config.rb

@@ -50,6 +50,8 @@ class Config < Vagrant.plugin("2", :config)
       attr_accessor :vm_integration_services
       # @return [Boolean] Enable Enhanced session mode
       attr_accessor :enable_enhanced_session_mode
+      # @return [Boolean] Enable IPv4 only for connection to guest
+      attr_accessor :ipv4_only
 
       def initialize
         @ip_address_timeout = UNSET_VALUE
@@ -68,6 +70,7 @@ def initialize
         @enable_checkpoints = UNSET_VALUE
         @vm_integration_services = {}
         @enable_enhanced_session_mode = UNSET_VALUE
+        @ipv4_only = UNSET_VALUE
       end
 
       def finalize!
@@ -107,6 +110,10 @@ def finalize!
         @enable_checkpoints ||= @enable_automatic_checkpoints
 
         @enable_enhanced_session_mode = false if @enable_enhanced_session_mode == UNSET_VALUE
+
+        if @ipv4_only == UNSET_VALUE
+          @ipv4_only = Vagrant::Util::Platform.wsl? ? true : false
+        end
       end
 
       def validate(machine)

test/unit/plugins/providers/hyperv/action/wait_for_ip_address_test.rb

@@ -9,14 +9,16 @@
   let(:provider){ double("provider", driver: driver) }
   let(:driver){ double("driver") }
   let(:machine){ double("machine", provider: provider, provider_config: provider_config) }
-  let(:provider_config){ double("provider_config", ip_address_timeout: ip_address_timeout) }
+  let(:provider_config){ double("provider_config", ip_address_timeout: ip_address_timeout, ipv4_only: ipv4_only) }
   let(:ip_address_timeout){ 1 }
+  let(:ipv4_only){ false }
 
   let(:subject){ described_class.new(app, env) }
 
   before do
     allow(driver).to receive(:read_guest_ip).and_return("ip" => "127.0.0.1")
     allow(app).to receive(:call)
+    allow(Vagrant::Util::Platform).to receive(:wsl?).and_return(false)
   end
 
   it "should call the app on success" do
@@ -35,4 +37,30 @@
     expect(subject).to receive(:sleep)
     subject.call(env)
   end
+
+  it "should call the app on success with IPv6 address" do
+    expect(driver).to receive(:read_guest_ip).and_return("ip" => "FE80:0000:0000:0000:0202:B3FF:FE1E:8329")
+    subject.call(env)
+  end
+
+  context "IPv4_only" do
+    let(:ipv4_only){ true }
+
+    it "should call the app on success" do
+      expect(app).to receive(:call)
+      subject.call(env)
+    end
+
+    it "should set a timeout for waiting for IPv4 address" do
+      expect(Timeout).to receive(:timeout).with(ip_address_timeout)
+      subject.call(env)
+    end
+
+    it "should retry until it receives a valid IPv4 address" do
+      expect(driver).to receive(:read_guest_ip).and_return("ip" => "FE80:0000:0000:0000:0202:B3FF:FE1E:8329")
+      expect(driver).to receive(:read_guest_ip).and_return("ip" => "127.0.0.1")
+      expect(subject).to receive(:sleep)
+      subject.call(env)
+    end
+  end
 end

test/unit/plugins/providers/hyperv/config_test.rb

@@ -242,7 +242,6 @@
     end
   end
 
-
   describe "#enable_enhanced_session_mode" do
     it "is false by default" do
       subject.finalize!
@@ -255,4 +254,30 @@
       expect(subject.enable_enhanced_session_mode).to eq(true)
     end
   end
+
+  describe "#ipv4_only" do
+    context "within the WSL" do
+      before{ allow(Vagrant::Util::Platform).to receive(:wsl?).and_return(true) }
+
+      it "is true by default when in WSL" do
+        subject.finalize!
+        expect(subject.ipv4_only).to eq(true)
+      end
+    end
+
+    context "not within the WSL" do
+      before{ allow(Vagrant::Util::Platform).to receive(:wsl?).and_return(false) }
+
+      it "is false by default" do
+        subject.finalize!
+        expect(subject.ipv4_only).to eq(false)
+      end
+    end
+
+    it "can be set" do
+      subject.ipv4_only = true
+      subject.finalize!
+      expect(subject.ipv4_only).to eq(true)
+    end
+  end
 end

website/content/docs/providers/hyperv/configuration.mdx

@@ -20,6 +20,7 @@ you may set. A complete reference is shown below:
 - `enable_automatic_checkpoints` (boolean) Enable automatic checkpoints of the VM. Default: false
 - `enable_enhanced_session_mode` (boolean) - Enable enhanced session transport type for the VM. Default: false
 - `ip_address_timeout` (integer) - Number of seconds to wait for the VM to report an IP address. Default: 120.
+- `ipv4_only` (boolean) - Only connect to a guests IPv4 address ignoring an IPv6 address. Default: false unless running in WSL, in which case it will default to true.
 - `linked_clone` (boolean) - Use differencing disk instead of cloning entire VHD. Default: false
 - `mac` (string) - MAC address for the guest network interface
 - `maxmemory` (integer) - Maximum number of megabytes allowed to be allocated for the VM. When set Dynamic Memory Allocation will be enabled.