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26b6fe7f02
This adds a PCP test to the IGD test server, by hardcoding in a few observed packets from Denton's box. Signed-off-by: julianknodt <julianknodt@gmail.com>
63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package portmapper
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import (
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"encoding/binary"
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"testing"
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"inet.af/netaddr"
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)
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var examplePCPMapResponse = []byte{2, 129, 0, 0, 0, 0, 28, 32, 0, 2, 155, 237, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 129, 112, 9, 24, 241, 208, 251, 45, 157, 76, 10, 188, 17, 0, 0, 0, 4, 210, 4, 210, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 135, 180, 175, 246}
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func TestParsePCPMapResponse(t *testing.T) {
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mapping, err := parsePCPMapResponse(examplePCPMapResponse)
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if err != nil {
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t.Fatalf("failed to parse PCP Map Response: %v", err)
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}
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if mapping == nil {
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t.Fatalf("got nil mapping when expected non-nil")
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}
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expectedAddr := netaddr.MustParseIPPort("135.180.175.246:1234")
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if mapping.external != expectedAddr {
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t.Errorf("mismatched external address, got: %v, want: %v", mapping.external, expectedAddr)
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}
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}
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const (
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serverResponseBit = 1 << 7
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fakeLifetimeSec = 1<<31 - 1
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)
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func buildPCPDiscoResponse(req []byte) []byte {
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out := make([]byte, 24)
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out[0] = pcpVersion
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out[1] = req[1] | serverResponseBit
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out[3] = 0
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// Do not put an epoch time in 8:12, when we start using it, tests that use it should fail.
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return out
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}
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func buildPCPMapResponse(req []byte) []byte {
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out := make([]byte, 24+36)
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out[0] = pcpVersion
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out[1] = req[1] | serverResponseBit
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out[3] = 0
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binary.BigEndian.PutUint32(out[4:8], 1<<30)
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// Do not put an epoch time in 8:12, when we start using it, tests that use it should fail.
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mapResp := out[24:]
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mapReq := req[24:]
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// copy nonce, protocol and internal port
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copy(mapResp[:13], mapReq[:13])
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copy(mapResp[16:18], mapReq[16:18])
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// assign external port
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binary.BigEndian.PutUint16(mapResp[18:20], 4242)
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assignedIP := netaddr.IPv4(127, 0, 0, 1)
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assignedIP16 := assignedIP.As16()
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copy(mapResp[20:36], assignedIP16[:])
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return out
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}
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