mirror of
https://github.com/netbirdio/netbird.git
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128 lines
2.6 KiB
Go
128 lines
2.6 KiB
Go
package netiputil
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import (
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"net/netip"
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"testing"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestEncodeDecodePrefix(t *testing.T) {
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tests := []struct {
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name string
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prefix string
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size int
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}{
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{
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name: "v4 host",
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prefix: "100.64.0.1/32",
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size: 5,
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},
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{
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name: "v4 network",
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prefix: "10.0.0.0/8",
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size: 5,
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},
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{
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name: "v4 default",
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prefix: "0.0.0.0/0",
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size: 5,
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},
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{
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name: "v6 host",
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prefix: "fd00::1/128",
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size: 17,
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},
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{
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name: "v6 network",
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prefix: "fd00:1234:5678::/48",
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size: 17,
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},
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{
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name: "v6 default",
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prefix: "::/0",
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size: 17,
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},
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{
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name: "v4 /16 overlay",
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prefix: "100.64.0.1/16",
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size: 5,
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},
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{
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name: "v6 /64 overlay",
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prefix: "fd00::abcd:1/64",
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size: 17,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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p := netip.MustParsePrefix(tt.prefix)
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b := EncodePrefix(p)
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assert.Equal(t, tt.size, len(b), "encoded size")
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decoded, err := DecodePrefix(b)
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require.NoError(t, err)
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assert.Equal(t, p, decoded)
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})
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}
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}
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func TestEncodePrefixUnmaps(t *testing.T) {
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// v4-mapped v6 address should encode as v4
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mapped := netip.MustParsePrefix("::ffff:10.1.2.3/32")
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b := EncodePrefix(mapped)
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assert.Equal(t, 5, len(b), "v4-mapped should encode as 5 bytes")
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decoded, err := DecodePrefix(b)
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require.NoError(t, err)
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assert.Equal(t, netip.MustParsePrefix("10.1.2.3/32"), decoded)
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}
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func TestDecodeAddr(t *testing.T) {
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v4 := netip.MustParseAddr("100.64.0.5")
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b := EncodeAddr(v4)
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assert.Equal(t, 5, len(b))
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got, err := DecodeAddr(b)
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require.NoError(t, err)
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assert.Equal(t, v4, got)
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v6 := netip.MustParseAddr("fd00::1")
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b = EncodeAddr(v6)
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assert.Equal(t, 17, len(b))
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got, err = DecodeAddr(b)
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require.NoError(t, err)
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assert.Equal(t, v6, got)
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}
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func TestDecodePrefixInvalidLength(t *testing.T) {
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_, err := DecodePrefix([]byte{1, 2, 3})
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assert.Error(t, err)
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assert.Contains(t, err.Error(), "invalid compact prefix length 3")
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_, err = DecodePrefix(nil)
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assert.Error(t, err)
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_, err = DecodePrefix([]byte{})
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assert.Error(t, err)
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}
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func TestDecodePrefixUnmapsV6Input(t *testing.T) {
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// If someone encodes a v4-mapped v6 as 17 bytes, decode should unmap it
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// and clamp the prefix length to 32 for v4
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addr := netip.MustParseAddr("::ffff:192.168.1.1")
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raw := addr.As16()
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b := make([]byte, 17)
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copy(b, raw[:])
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b[16] = 128
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decoded, err := DecodePrefix(b)
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require.NoError(t, err)
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assert.True(t, decoded.Addr().Is4(), "should be unmapped to v4")
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assert.Equal(t, netip.MustParsePrefix("192.168.1.1/32"), decoded)
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}
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