mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-25 19:15:34 +00:00
351 lines
8.0 KiB
Go
351 lines
8.0 KiB
Go
// Copyright (c) 2020 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 packet
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import (
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"bytes"
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"net"
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"reflect"
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"testing"
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)
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func TestIP4String(t *testing.T) {
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const str = "1.2.3.4"
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ip := NewIP4(net.ParseIP(str))
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var got string
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allocs := testing.AllocsPerRun(1000, func() {
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got = ip.String()
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})
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if got != str {
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t.Errorf("got %q; want %q", got, str)
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}
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if allocs != 1 {
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t.Errorf("allocs = %v; want 1", allocs)
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}
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}
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var icmpRequestBuffer = []byte{
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// IP header up to checksum
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0x45, 0x00, 0x00, 0x27, 0xde, 0xad, 0x00, 0x00, 0x40, 0x01, 0x8c, 0x15,
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// source ip
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0x01, 0x02, 0x03, 0x04,
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// destination ip
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0x05, 0x06, 0x07, 0x08,
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// ICMP header
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0x08, 0x00, 0x7d, 0x22,
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// "request_payload"
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0x72, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x5f, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64,
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}
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var icmpRequestDecode = Parsed{
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b: icmpRequestBuffer,
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subofs: 20,
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dataofs: 24,
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length: len(icmpRequestBuffer),
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IPVersion: 4,
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IPProto: ICMP,
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SrcIP: NewIP4(net.ParseIP("1.2.3.4")),
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DstIP: NewIP4(net.ParseIP("5.6.7.8")),
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SrcPort: 0,
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DstPort: 0,
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}
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var icmpReplyBuffer = []byte{
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0x45, 0x00, 0x00, 0x25, 0x21, 0x52, 0x00, 0x00, 0x40, 0x01, 0x49, 0x73,
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// source ip
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0x05, 0x06, 0x07, 0x08,
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// destination ip
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0x01, 0x02, 0x03, 0x04,
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// ICMP header
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0x00, 0x00, 0xe6, 0x9e,
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// "reply_payload"
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0x72, 0x65, 0x70, 0x6c, 0x79, 0x5f, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64,
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}
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var icmpReplyDecode = Parsed{
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b: icmpReplyBuffer,
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subofs: 20,
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dataofs: 24,
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length: len(icmpReplyBuffer),
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IPVersion: 4,
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IPProto: ICMP,
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SrcIP: NewIP4(net.ParseIP("1.2.3.4")),
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DstIP: NewIP4(net.ParseIP("5.6.7.8")),
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SrcPort: 0,
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DstPort: 0,
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}
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// IPv6 Router Solicitation
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var ipv6PacketBuffer = []byte{
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0x60, 0x00, 0x00, 0x00, 0x00, 0x08, 0x3a, 0xff,
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0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0xfb, 0x57, 0x1d, 0xea, 0x9c, 0x39, 0x8f, 0xb7,
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0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
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0x85, 0x00, 0x38, 0x04, 0x00, 0x00, 0x00, 0x00,
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}
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var ipv6PacketDecode = Parsed{
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b: ipv6PacketBuffer,
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IPVersion: 6,
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IPProto: ICMPv6,
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}
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// This is a malformed IPv4 packet.
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// Namely, the string "tcp_payload" follows the first byte of the IPv4 header.
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var unknownPacketBuffer = []byte{
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0x45, 0x74, 0x63, 0x70, 0x5f, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64,
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}
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var unknownPacketDecode = Parsed{
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b: unknownPacketBuffer,
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IPVersion: 0,
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IPProto: Unknown,
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}
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var tcpPacketBuffer = []byte{
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// IP header up to checksum
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0x45, 0x00, 0x00, 0x37, 0xde, 0xad, 0x00, 0x00, 0x40, 0x06, 0x49, 0x5f,
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// source ip
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0x01, 0x02, 0x03, 0x04,
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// destination ip
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0x05, 0x06, 0x07, 0x08,
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// TCP header with SYN, ACK set
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0x00, 0x7b, 0x02, 0x37, 0x00, 0x00, 0x12, 0x34, 0x00, 0x00, 0x00, 0x00,
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0x50, 0x12, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
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// "request_payload"
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0x72, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x5f, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64,
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}
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var tcpPacketDecode = Parsed{
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b: tcpPacketBuffer,
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subofs: 20,
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dataofs: 40,
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length: len(tcpPacketBuffer),
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IPVersion: 4,
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IPProto: TCP,
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SrcIP: NewIP4(net.ParseIP("1.2.3.4")),
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DstIP: NewIP4(net.ParseIP("5.6.7.8")),
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SrcPort: 123,
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DstPort: 567,
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TCPFlags: TCPSynAck,
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}
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var udpRequestBuffer = []byte{
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// IP header up to checksum
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0x45, 0x00, 0x00, 0x2b, 0xde, 0xad, 0x00, 0x00, 0x40, 0x11, 0x8c, 0x01,
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// source ip
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0x01, 0x02, 0x03, 0x04,
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// destination ip
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0x05, 0x06, 0x07, 0x08,
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// UDP header
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0x00, 0x7b, 0x02, 0x37, 0x00, 0x17, 0x72, 0x1d,
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// "request_payload"
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0x72, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x5f, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64,
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}
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var udpRequestDecode = Parsed{
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b: udpRequestBuffer,
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subofs: 20,
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dataofs: 28,
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length: len(udpRequestBuffer),
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IPVersion: 4,
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IPProto: UDP,
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SrcIP: NewIP4(net.ParseIP("1.2.3.4")),
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DstIP: NewIP4(net.ParseIP("5.6.7.8")),
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SrcPort: 123,
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DstPort: 567,
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}
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var udpReplyBuffer = []byte{
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// IP header up to checksum
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0x45, 0x00, 0x00, 0x29, 0x21, 0x52, 0x00, 0x00, 0x40, 0x11, 0x49, 0x5f,
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// source ip
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0x05, 0x06, 0x07, 0x08,
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// destination ip
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0x01, 0x02, 0x03, 0x04,
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// UDP header
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0x02, 0x37, 0x00, 0x7b, 0x00, 0x15, 0xd3, 0x9d,
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// "reply_payload"
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0x72, 0x65, 0x70, 0x6c, 0x79, 0x5f, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64,
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}
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var udpReplyDecode = Parsed{
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b: udpReplyBuffer,
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subofs: 20,
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dataofs: 28,
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length: len(udpReplyBuffer),
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IPProto: UDP,
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SrcIP: NewIP4(net.ParseIP("1.2.3.4")),
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DstIP: NewIP4(net.ParseIP("5.6.7.8")),
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SrcPort: 567,
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DstPort: 123,
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}
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func TestParsed(t *testing.T) {
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tests := []struct {
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name string
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qdecode Parsed
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want string
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}{
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{"tcp", tcpPacketDecode, "TCP{1.2.3.4:123 > 5.6.7.8:567}"},
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{"icmp", icmpRequestDecode, "ICMP{1.2.3.4:0 > 5.6.7.8:0}"},
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{"unknown", unknownPacketDecode, "Unknown{???}"},
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{"ipv6", ipv6PacketDecode, "IPv6{Proto=58}"},
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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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got := tt.qdecode.String()
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if got != tt.want {
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t.Errorf("got %q; want %q", got, tt.want)
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}
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})
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}
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var sink string
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allocs := testing.AllocsPerRun(1000, func() {
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sink = tests[0].qdecode.String()
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})
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_ = sink
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if allocs != 1 {
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t.Errorf("allocs = %v; want 1", allocs)
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}
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}
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func TestDecode(t *testing.T) {
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tests := []struct {
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name string
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buf []byte
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want Parsed
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}{
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{"icmp", icmpRequestBuffer, icmpRequestDecode},
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{"ipv6", ipv6PacketBuffer, ipv6PacketDecode},
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{"unknown", unknownPacketBuffer, unknownPacketDecode},
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{"tcp", tcpPacketBuffer, tcpPacketDecode},
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{"udp", udpRequestBuffer, udpRequestDecode},
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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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var got Parsed
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got.Decode(tt.buf)
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if !reflect.DeepEqual(got, tt.want) {
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t.Errorf("mismatch\n got: %#v\nwant: %#v", got, tt.want)
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}
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})
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}
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allocs := testing.AllocsPerRun(1000, func() {
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var got Parsed
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got.Decode(tests[0].buf)
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})
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if allocs != 0 {
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t.Errorf("allocs = %v; want 0", allocs)
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}
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}
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func BenchmarkDecode(b *testing.B) {
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benches := []struct {
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name string
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buf []byte
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}{
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{"icmp", icmpRequestBuffer},
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{"unknown", unknownPacketBuffer},
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{"tcp", tcpPacketBuffer},
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}
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for _, bench := range benches {
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b.Run(bench.name, func(b *testing.B) {
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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var p Parsed
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p.Decode(bench.buf)
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}
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})
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}
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}
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func TestMarshalRequest(t *testing.T) {
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// Too small to hold our packets, but only barely.
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var small [20]byte
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var large [64]byte
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icmpHeader := icmpRequestDecode.ICMPHeader()
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udpHeader := udpRequestDecode.UDPHeader()
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tests := []struct {
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name string
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header Header
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want []byte
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}{
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{"icmp", &icmpHeader, icmpRequestBuffer},
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{"udp", &udpHeader, udpRequestBuffer},
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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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err := tt.header.Marshal(small[:])
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if err != errSmallBuffer {
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t.Errorf("got err: nil; want: %s", errSmallBuffer)
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}
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dataOffset := tt.header.Len()
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dataLength := copy(large[dataOffset:], []byte("request_payload"))
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end := dataOffset + dataLength
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err = tt.header.Marshal(large[:end])
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if err != nil {
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t.Errorf("got err: %s; want nil", err)
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}
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if !bytes.Equal(large[:end], tt.want) {
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t.Errorf("got %x; want %x", large[:end], tt.want)
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}
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})
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}
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}
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func TestMarshalResponse(t *testing.T) {
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var buf [64]byte
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icmpHeader := icmpRequestDecode.ICMPHeader()
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udpHeader := udpRequestDecode.UDPHeader()
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tests := []struct {
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name string
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header Header
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want []byte
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}{
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{"icmp", &icmpHeader, icmpReplyBuffer},
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{"udp", &udpHeader, udpReplyBuffer},
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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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tt.header.ToResponse()
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dataOffset := tt.header.Len()
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dataLength := copy(buf[dataOffset:], []byte("reply_payload"))
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end := dataOffset + dataLength
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err := tt.header.Marshal(buf[:end])
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if err != nil {
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t.Errorf("got err: %s; want nil", err)
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}
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if !bytes.Equal(buf[:end], tt.want) {
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t.Errorf("got %x; want %x", buf[:end], tt.want)
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}
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})
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}
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}
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