mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-25 19:15:34 +00:00
563 lines
14 KiB
Go
563 lines
14 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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"reflect"
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"testing"
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"inet.af/netaddr"
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"tailscale.com/types/ipproto"
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)
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const (
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Unknown = ipproto.Unknown
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TCP = ipproto.TCP
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UDP = ipproto.UDP
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SCTP = ipproto.SCTP
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IGMP = ipproto.IGMP
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ICMPv4 = ipproto.ICMPv4
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ICMPv6 = ipproto.ICMPv6
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TSMP = ipproto.TSMP
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Fragment = ipproto.Fragment
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)
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func mustIPPort(s string) netaddr.IPPort {
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ipp, err := netaddr.ParseIPPort(s)
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if err != nil {
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panic(err)
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}
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return ipp
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}
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var icmp4RequestBuffer = []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 icmp4RequestDecode = Parsed{
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b: icmp4RequestBuffer,
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subofs: 20,
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dataofs: 24,
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length: len(icmp4RequestBuffer),
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IPVersion: 4,
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IPProto: ICMPv4,
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Src: mustIPPort("1.2.3.4:0"),
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Dst: mustIPPort("5.6.7.8:0"),
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}
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var icmp4ReplyBuffer = []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 icmp4ReplyDecode = Parsed{
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b: icmp4ReplyBuffer,
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subofs: 20,
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dataofs: 24,
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length: len(icmp4ReplyBuffer),
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IPVersion: 4,
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IPProto: ICMPv4,
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Src: mustIPPort("1.2.3.4:0"),
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Dst: mustIPPort("5.6.7.8:0"),
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}
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// ICMPv6 Router Solicitation
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var icmp6PacketBuffer = []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 icmp6PacketDecode = Parsed{
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b: icmp6PacketBuffer,
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subofs: 40,
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dataofs: 44,
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length: len(icmp6PacketBuffer),
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IPVersion: 6,
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IPProto: ICMPv6,
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Src: mustIPPort("[fe80::fb57:1dea:9c39:8fb7]:0"),
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Dst: mustIPPort("[ff02::2]:0"),
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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 tcp4PacketBuffer = []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 tcp4PacketDecode = Parsed{
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b: tcp4PacketBuffer,
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subofs: 20,
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dataofs: 40,
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length: len(tcp4PacketBuffer),
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IPVersion: 4,
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IPProto: TCP,
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Src: mustIPPort("1.2.3.4:123"),
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Dst: mustIPPort("5.6.7.8:567"),
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TCPFlags: TCPSynAck,
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}
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var tcp6RequestBuffer = []byte{
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// IPv6 header up to hop limit
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0x60, 0x06, 0xef, 0xcc, 0x00, 0x28, 0x06, 0x40,
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// Src addr
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0x20, 0x01, 0x05, 0x59, 0xbc, 0x13, 0x54, 0x00, 0x17, 0x49, 0x46, 0x28, 0x39, 0x34, 0x0e, 0x1b,
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// Dst addr
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0x26, 0x07, 0xf8, 0xb0, 0x40, 0x0a, 0x08, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x0e,
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// TCP SYN segment, no payload
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0xa4, 0x60, 0x00, 0x50, 0xf3, 0x82, 0xa1, 0x25, 0x00, 0x00, 0x00, 0x00, 0xa0, 0x02, 0xfd, 0x20,
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0xb1, 0xc6, 0x00, 0x00, 0x02, 0x04, 0x05, 0xa0, 0x04, 0x02, 0x08, 0x0a, 0xca, 0x76, 0xa6, 0x8e,
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0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x03, 0x07,
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}
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var tcp6RequestDecode = Parsed{
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b: tcp6RequestBuffer,
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subofs: 40,
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dataofs: len(tcp6RequestBuffer),
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length: len(tcp6RequestBuffer),
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IPVersion: 6,
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IPProto: TCP,
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Src: mustIPPort("[2001:559:bc13:5400:1749:4628:3934:e1b]:42080"),
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Dst: mustIPPort("[2607:f8b0:400a:809::200e]:80"),
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TCPFlags: TCPSyn,
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}
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var udp4RequestBuffer = []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 udp4RequestDecode = Parsed{
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b: udp4RequestBuffer,
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subofs: 20,
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dataofs: 28,
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length: len(udp4RequestBuffer),
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IPVersion: 4,
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IPProto: UDP,
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Src: mustIPPort("1.2.3.4:123"),
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Dst: mustIPPort("5.6.7.8:567"),
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}
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var invalid4RequestBuffer = []byte{
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// IP header up to checksum. IHL field points beyond end of packet.
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0x4a, 0x00, 0x00, 0x14, 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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}
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// Regression check for the IHL field pointing beyond the end of the
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// packet.
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var invalid4RequestDecode = Parsed{
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b: invalid4RequestBuffer,
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subofs: 40,
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length: len(invalid4RequestBuffer),
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IPVersion: 4,
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IPProto: Unknown,
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Src: mustIPPort("1.2.3.4:0"),
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Dst: mustIPPort("5.6.7.8:0"),
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}
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var udp6RequestBuffer = []byte{
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// IPv6 header up to hop limit
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0x60, 0x0e, 0xc9, 0x67, 0x00, 0x29, 0x11, 0x40,
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// Src addr
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0x20, 0x01, 0x05, 0x59, 0xbc, 0x13, 0x54, 0x00, 0x17, 0x49, 0x46, 0x28, 0x39, 0x34, 0x0e, 0x1b,
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// Dst addr
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0x26, 0x07, 0xf8, 0xb0, 0x40, 0x0a, 0x08, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x0e,
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// UDP header
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0xd4, 0x04, 0x01, 0xbb, 0x00, 0x29, 0x96, 0x84,
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// Payload
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0x5c, 0x06, 0xae, 0x85, 0x02, 0xf5, 0xdb, 0x90, 0xe0, 0xe0, 0x93, 0xed, 0x9a, 0xd9, 0x92, 0x69, 0xbe, 0x36, 0x8a, 0x7d, 0xd7, 0xce, 0xd0, 0x8a, 0xf2, 0x51, 0x95, 0xff, 0xb6, 0x92, 0x70, 0x10, 0xd7,
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}
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var udp6RequestDecode = Parsed{
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b: udp6RequestBuffer,
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subofs: 40,
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dataofs: 48,
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length: len(udp6RequestBuffer),
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IPVersion: 6,
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IPProto: UDP,
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Src: mustIPPort("[2001:559:bc13:5400:1749:4628:3934:e1b]:54276"),
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Dst: mustIPPort("[2607:f8b0:400a:809::200e]:443"),
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}
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var udp4ReplyBuffer = []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 udp4ReplyDecode = Parsed{
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b: udp4ReplyBuffer,
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subofs: 20,
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dataofs: 28,
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length: len(udp4ReplyBuffer),
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IPProto: UDP,
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Src: mustIPPort("1.2.3.4:567"),
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Dst: mustIPPort("5.6.7.8:123"),
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}
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var igmpPacketBuffer = []byte{
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// IP header up to checksum
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0x46, 0xc0, 0x00, 0x20, 0x00, 0x00, 0x40, 0x00, 0x01, 0x02, 0x41, 0x22,
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// source IP
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0xc0, 0xa8, 0x01, 0x52,
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// destination IP
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0xe0, 0x00, 0x00, 0xfb,
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// IGMP Membership Report
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0x94, 0x04, 0x00, 0x00, 0x16, 0x00, 0x09, 0x04, 0xe0, 0x00, 0x00, 0xfb,
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//0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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}
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var igmpPacketDecode = Parsed{
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b: igmpPacketBuffer,
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subofs: 24,
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length: len(igmpPacketBuffer),
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IPVersion: 4,
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IPProto: IGMP,
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Src: mustIPPort("192.168.1.82:0"),
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Dst: mustIPPort("224.0.0.251:0"),
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}
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var ipv4TSMPBuffer = []byte{
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// IPv4 header:
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0x45, 0x00,
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0x00, 0x1b, // 20 + 7 bytes total
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0x00, 0x00, // ID
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0x00, 0x00, // Fragment
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0x40, // TTL
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byte(TSMP),
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0x5f, 0xc3, // header checksum (wrong here)
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// source IP:
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0x64, 0x5e, 0x0c, 0x0e,
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// dest IP:
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0x64, 0x4a, 0x46, 0x03,
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byte(TSMPTypeRejectedConn),
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byte(TCP),
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byte(RejectedDueToACLs),
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0x00, 123, // src port
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0x00, 80, // dst port
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}
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var ipv4TSMPDecode = Parsed{
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b: ipv4TSMPBuffer,
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subofs: 20,
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dataofs: 20,
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length: 27,
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IPVersion: 4,
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IPProto: TSMP,
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Src: mustIPPort("100.94.12.14:0"),
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Dst: mustIPPort("100.74.70.3:0"),
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}
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// IPv4 SCTP
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var sctpBuffer = []byte{
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// IPv4 header:
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0x45, 0x00,
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0x00, 0x20, // 20 + 12 bytes total
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0x00, 0x00, // ID
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0x00, 0x00, // Fragment
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0x40, // TTL
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byte(SCTP),
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// Checksum, unchecked:
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1, 2,
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// source IP:
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0x64, 0x5e, 0x0c, 0x0e,
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// dest IP:
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0x64, 0x4a, 0x46, 0x03,
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// Src Port, Dest Port:
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0x00, 0x7b, 0x01, 0xc8,
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// Verification tag:
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1, 2, 3, 4,
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// Checksum: (unchecked)
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5, 6, 7, 8,
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}
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var sctpDecode = Parsed{
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b: sctpBuffer,
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subofs: 20,
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length: 20 + 12,
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IPVersion: 4,
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IPProto: SCTP,
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Src: mustIPPort("100.94.12.14:123"),
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Dst: mustIPPort("100.74.70.3:456"),
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}
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func TestParsedString(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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{"tcp4", tcp4PacketDecode, "TCP{1.2.3.4:123 > 5.6.7.8:567}"},
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{"tcp6", tcp6RequestDecode, "TCP{[2001:559:bc13:5400:1749:4628:3934:e1b]:42080 > [2607:f8b0:400a:809::200e]:80}"},
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{"udp4", udp4RequestDecode, "UDP{1.2.3.4:123 > 5.6.7.8:567}"},
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{"udp6", udp6RequestDecode, "UDP{[2001:559:bc13:5400:1749:4628:3934:e1b]:54276 > [2607:f8b0:400a:809::200e]:443}"},
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{"icmp4", icmp4RequestDecode, "ICMPv4{1.2.3.4:0 > 5.6.7.8:0}"},
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{"icmp6", icmp6PacketDecode, "ICMPv6{[fe80::fb57:1dea:9c39:8fb7]:0 > [ff02::2]:0}"},
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{"igmp", igmpPacketDecode, "IGMP{192.168.1.82:0 > 224.0.0.251:0}"},
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{"unknown", unknownPacketDecode, "Unknown{???}"},
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{"ipv4_tsmp", ipv4TSMPDecode, "TSMP{100.94.12.14:0 > 100.74.70.3:0}"},
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{"sctp", sctpDecode, "SCTP{100.94.12.14:123 > 100.74.70.3:456}"},
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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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allocs := testing.AllocsPerRun(1000, func() {
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sinkString = tests[0].qdecode.String()
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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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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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{"icmp4", icmp4RequestBuffer, icmp4RequestDecode},
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{"icmp6", icmp6PacketBuffer, icmp6PacketDecode},
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{"tcp4", tcp4PacketBuffer, tcp4PacketDecode},
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{"tcp6", tcp6RequestBuffer, tcp6RequestDecode},
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{"udp4", udp4RequestBuffer, udp4RequestDecode},
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{"udp6", udp6RequestBuffer, udp6RequestDecode},
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{"igmp", igmpPacketBuffer, igmpPacketDecode},
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{"unknown", unknownPacketBuffer, unknownPacketDecode},
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{"invalid4", invalid4RequestBuffer, invalid4RequestDecode},
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{"ipv4_tsmp", ipv4TSMPBuffer, ipv4TSMPDecode},
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{"ipv4_sctp", sctpBuffer, sctpDecode},
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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: %s %#v\nwant: %s %#v", got.String(), got, tt.want.String(), tt.want)
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}
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|
})
|
|
}
|
|
|
|
allocs := testing.AllocsPerRun(1000, func() {
|
|
var got Parsed
|
|
got.Decode(tests[0].buf)
|
|
})
|
|
if allocs != 0 {
|
|
t.Errorf("allocs = %v; want 0", allocs)
|
|
}
|
|
}
|
|
|
|
func BenchmarkDecode(b *testing.B) {
|
|
benches := []struct {
|
|
name string
|
|
buf []byte
|
|
}{
|
|
{"tcp4", tcp4PacketBuffer},
|
|
{"tcp6", tcp6RequestBuffer},
|
|
{"udp4", udp4RequestBuffer},
|
|
{"udp6", udp6RequestBuffer},
|
|
{"icmp4", icmp4RequestBuffer},
|
|
{"icmp6", icmp6PacketBuffer},
|
|
{"igmp", igmpPacketBuffer},
|
|
{"unknown", unknownPacketBuffer},
|
|
}
|
|
|
|
for _, bench := range benches {
|
|
b.Run(bench.name, func(b *testing.B) {
|
|
b.ReportAllocs()
|
|
for i := 0; i < b.N; i++ {
|
|
var p Parsed
|
|
p.Decode(bench.buf)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestMarshalRequest(t *testing.T) {
|
|
// Too small to hold our packets, but only barely.
|
|
var small [20]byte
|
|
var large [64]byte
|
|
|
|
icmpHeader := icmp4RequestDecode.ICMP4Header()
|
|
udpHeader := udp4RequestDecode.UDP4Header()
|
|
tests := []struct {
|
|
name string
|
|
header Header
|
|
want []byte
|
|
}{
|
|
{"icmp", &icmpHeader, icmp4RequestBuffer},
|
|
{"udp", &udpHeader, udp4RequestBuffer},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
err := tt.header.Marshal(small[:])
|
|
if err != errSmallBuffer {
|
|
t.Errorf("got err: nil; want: %s", errSmallBuffer)
|
|
}
|
|
|
|
dataOffset := tt.header.Len()
|
|
dataLength := copy(large[dataOffset:], []byte("request_payload"))
|
|
end := dataOffset + dataLength
|
|
err = tt.header.Marshal(large[:end])
|
|
|
|
if err != nil {
|
|
t.Errorf("got err: %s; want nil", err)
|
|
}
|
|
|
|
if !bytes.Equal(large[:end], tt.want) {
|
|
t.Errorf("got %x; want %x", large[:end], tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestMarshalResponse(t *testing.T) {
|
|
var buf [64]byte
|
|
|
|
icmpHeader := icmp4RequestDecode.ICMP4Header()
|
|
udpHeader := udp4RequestDecode.UDP4Header()
|
|
|
|
type HeaderToResponser interface {
|
|
Header
|
|
// ToResponse transforms the header into one for a response packet.
|
|
// For instance, this swaps the source and destination IPs.
|
|
ToResponse()
|
|
}
|
|
|
|
tests := []struct {
|
|
name string
|
|
header HeaderToResponser
|
|
want []byte
|
|
}{
|
|
{"icmp", &icmpHeader, icmp4ReplyBuffer},
|
|
{"udp", &udpHeader, udp4ReplyBuffer},
|
|
}
|
|
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
tt.header.ToResponse()
|
|
|
|
dataOffset := tt.header.Len()
|
|
dataLength := copy(buf[dataOffset:], []byte("reply_payload"))
|
|
end := dataOffset + dataLength
|
|
err := tt.header.Marshal(buf[:end])
|
|
|
|
if err != nil {
|
|
t.Errorf("got err: %s; want nil", err)
|
|
}
|
|
|
|
if !bytes.Equal(buf[:end], tt.want) {
|
|
t.Errorf("got %x; want %x", buf[:end], tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
var sinkString string
|
|
|
|
func BenchmarkString(b *testing.B) {
|
|
benches := []struct {
|
|
name string
|
|
buf []byte
|
|
}{
|
|
{"tcp4", tcp4PacketBuffer},
|
|
{"tcp6", tcp6RequestBuffer},
|
|
{"udp4", udp4RequestBuffer},
|
|
{"udp6", udp6RequestBuffer},
|
|
{"icmp4", icmp4RequestBuffer},
|
|
{"icmp6", icmp6PacketBuffer},
|
|
{"igmp", igmpPacketBuffer},
|
|
{"unknown", unknownPacketBuffer},
|
|
}
|
|
|
|
for _, bench := range benches {
|
|
b.Run(bench.name, func(b *testing.B) {
|
|
b.ReportAllocs()
|
|
var p Parsed
|
|
p.Decode(bench.buf)
|
|
b.ResetTimer()
|
|
for i := 0; i < b.N; i++ {
|
|
sinkString = p.String()
|
|
}
|
|
})
|
|
}
|
|
}
|