AdGuardHome/internal/dhcpd/conn_unix_test.go

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