115 lines
2.7 KiB
Go
115 lines
2.7 KiB
Go
//go:build darwin || freebsd || linux || openbsd
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package dhcpd
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import (
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"net"
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"testing"
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"github.com/AdguardTeam/golibs/testutil"
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"github.com/google/gopacket"
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"github.com/google/gopacket/layers"
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"github.com/insomniacslk/dhcp/dhcpv4"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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//lint:ignore SA1019 See the TODO in go.mod.
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"github.com/mdlayher/raw"
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)
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func TestDHCPConn_WriteTo_common(t *testing.T) {
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respData := (&dhcpv4.DHCPv4{}).ToBytes()
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udpAddr := &net.UDPAddr{
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IP: net.IP{1, 2, 3, 4},
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Port: dhcpv4.ClientPort,
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}
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t.Run("unicast_ip", func(t *testing.T) {
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writeTo := func(_ []byte, addr net.Addr) (_ int, _ error) {
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assert.Equal(t, udpAddr, addr)
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return 0, nil
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}
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conn := &dhcpConn{udpConn: &fakePacketConn{writeTo: writeTo}}
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_, err := conn.WriteTo(respData, udpAddr)
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assert.NoError(t, err)
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})
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t.Run("unexpected_addr_type", func(t *testing.T) {
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type unexpectedAddrType struct {
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net.Addr
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}
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conn := &dhcpConn{}
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n, err := conn.WriteTo(nil, &unexpectedAddrType{})
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require.Error(t, err)
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testutil.AssertErrorMsg(t, "addr has an unexpected type *dhcpd.unexpectedAddrType", err)
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assert.Zero(t, n)
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})
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}
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func TestBuildEtherPkt(t *testing.T) {
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conn := &dhcpConn{
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srcMAC: net.HardwareAddr{1, 2, 3, 4, 5, 6},
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srcIP: net.IP{1, 2, 3, 4},
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}
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peer := &dhcpUnicastAddr{
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Addr: raw.Addr{HardwareAddr: net.HardwareAddr{6, 5, 4, 3, 2, 1}},
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yiaddr: net.IP{4, 3, 2, 1},
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}
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payload := (&dhcpv4.DHCPv4{}).ToBytes()
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t.Run("success", func(t *testing.T) {
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pkt, err := conn.buildEtherPkt(payload, peer)
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require.NoError(t, err)
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assert.NotEmpty(t, pkt)
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actualPkt := gopacket.NewPacket(pkt, layers.LayerTypeEthernet, gopacket.DecodeOptions{
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NoCopy: true,
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})
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require.NotNil(t, actualPkt)
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wantTypes := []gopacket.LayerType{
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layers.LayerTypeEthernet,
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layers.LayerTypeIPv4,
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layers.LayerTypeUDP,
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layers.LayerTypeDHCPv4,
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}
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actualLayers := actualPkt.Layers()
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require.Len(t, actualLayers, len(wantTypes))
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for i, wantType := range wantTypes {
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layer := actualLayers[i]
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require.NotNil(t, layer)
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assert.Equal(t, wantType, layer.LayerType())
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}
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})
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t.Run("bad_payload", func(t *testing.T) {
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// Create an invalid DHCP packet.
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invalidPayload := []byte{1, 2, 3, 4}
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pkt, err := conn.buildEtherPkt(invalidPayload, peer)
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require.NoError(t, err)
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assert.NotEmpty(t, pkt)
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})
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t.Run("serializing_error", func(t *testing.T) {
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// Create a peer with invalid MAC.
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badPeer := &dhcpUnicastAddr{
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Addr: raw.Addr{HardwareAddr: net.HardwareAddr{5, 4, 3, 2, 1}},
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yiaddr: net.IP{4, 3, 2, 1},
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}
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pkt, err := conn.buildEtherPkt(payload, badPeer)
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require.Error(t, err)
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assert.Empty(t, pkt)
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})
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}
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