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Feat fake dns address (#902)

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Works only with userspace implementation:
1. Configure host to solve DNS requests via a fake DSN server address in the Netbird network.
2. Add to firewall catch rule for these DNS requests.
3. Resolve these DNS requests and respond by writing directly to wireguard device.
This commit is contained in:
Givi Khojanashvili
2023-06-08 13:46:57 +04:00
committed by GitHub
parent 2c9583dfe1
commit 1d9feab2d9
17 changed files with 721 additions and 57 deletions
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26
iface/device_wrapper_test.go
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@ -14,13 +14,6 @@ func TestDeviceWrapperRead(t *testing.T) {
ctrl := gomock.NewController(t)
defer ctrl.Finish()
tun := mocks.NewMockDevice(ctrl)
filter := mocks.NewMockPacketFilter(ctrl)
mockBufs := [][]byte{{}}
mockSizes := []int{0}
mockOffset := 0
t.Run("read ICMP", func(t *testing.T) {
ipLayer := &layers.IPv4{
Version: 4,
@ -46,6 +39,11 @@ func TestDeviceWrapperRead(t *testing.T) {
return
}
mockBufs := [][]byte{{}}
mockSizes := []int{0}
mockOffset := 0
tun := mocks.NewMockDevice(ctrl)
tun.EXPECT().Read(mockBufs, mockSizes, mockOffset).
DoAndReturn(func(bufs [][]byte, sizes []int, offset int) (int, error) {
bufs[0] = buffer.Bytes()
@ -95,7 +93,10 @@ func TestDeviceWrapperRead(t *testing.T) {
return
}
mockBufs := [][]byte{buffer.Bytes()}
mockBufs[0] = buffer.Bytes()
tun := mocks.NewMockDevice(ctrl)
tun.EXPECT().Write(mockBufs, 0).Return(1, nil)
wrapped := newDeviceWrapper(tun)
@ -138,10 +139,13 @@ func TestDeviceWrapperRead(t *testing.T) {
return
}
mockBufs = [][]byte{}
mockBufs := [][]byte{}
tun := mocks.NewMockDevice(ctrl)
tun.EXPECT().Write(mockBufs, 0).Return(0, nil)
filter.EXPECT().DropOutput(gomock.Any()).Return(true)
filter := mocks.NewMockPacketFilter(ctrl)
filter.EXPECT().DropIncoming(gomock.Any()).Return(true)
wrapped := newDeviceWrapper(tun)
wrapped.filter = filter
@ -188,13 +192,15 @@ func TestDeviceWrapperRead(t *testing.T) {
mockSizes := []int{0}
mockOffset := 0
tun := mocks.NewMockDevice(ctrl)
tun.EXPECT().Read(mockBufs, mockSizes, mockOffset).
DoAndReturn(func(bufs [][]byte, sizes []int, offset int) (int, error) {
bufs[0] = buffer.Bytes()
sizes[0] = len(bufs[0])
return 1, nil
})
filter.EXPECT().DropInput(gomock.Any()).Return(true)
filter := mocks.NewMockPacketFilter(ctrl)
filter.EXPECT().DropOutgoing(gomock.Any()).Return(true)
wrapped := newDeviceWrapper(tun)
wrapped.filter = filter