mirror of
https://git.zx2c4.com/wireguard-go
synced 2024-11-15 01:05:15 +01:00
device: test packets between two fake devices
Signed-off-by: David Crawshaw <crawshaw@tailscale.io>
This commit is contained in:
David Crawshaw
Jason A. Donenfeld
parent
f2ea85e9f9
commit
540d01e54a
@ -5,54 +5,212 @@
|
||||
|
||||
package device
|
||||
|
||||
/* Create two device instances and simulate full WireGuard interaction
|
||||
* without network dependencies
|
||||
*/
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"bytes"
|
||||
"encoding/binary"
|
||||
"io"
|
||||
"net"
|
||||
"os"
|
||||
"strings"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"golang.zx2c4.com/wireguard/tun"
|
||||
)
|
||||
|
||||
func TestDevice(t *testing.T) {
|
||||
|
||||
// prepare tun devices for generating traffic
|
||||
|
||||
tun1 := newDummyTUN("tun1")
|
||||
tun2 := newDummyTUN("tun2")
|
||||
|
||||
_ = tun1
|
||||
_ = tun2
|
||||
|
||||
// prepare endpoints
|
||||
|
||||
end1, err := CreateDummyEndpoint()
|
||||
if err != nil {
|
||||
t.Error("failed to create endpoint:", err.Error())
|
||||
}
|
||||
|
||||
end2, err := CreateDummyEndpoint()
|
||||
if err != nil {
|
||||
t.Error("failed to create endpoint:", err.Error())
|
||||
}
|
||||
|
||||
_ = end1
|
||||
_ = end2
|
||||
|
||||
// create binds
|
||||
|
||||
}
|
||||
|
||||
func randDevice(t *testing.T) *Device {
|
||||
sk, err := newPrivateKey()
|
||||
if err != nil {
|
||||
func TestTwoDevicePing(t *testing.T) {
|
||||
// TODO(crawshaw): pick unused ports on localhost
|
||||
cfg1 := `private_key=481eb0d8113a4a5da532d2c3e9c14b53c8454b34ab109676f6b58c2245e37b58
|
||||
listen_port=53511
|
||||
replace_peers=true
|
||||
public_key=f70dbb6b1b92a1dde1c783b297016af3f572fef13b0abb16a2623d89a58e9725
|
||||
protocol_version=1
|
||||
replace_allowed_ips=true
|
||||
allowed_ip=1.0.0.2/32
|
||||
endpoint=127.0.0.1:53512`
|
||||
tun1 := NewChannelTUN()
|
||||
dev1 := NewDevice(tun1.TUN(), NewLogger(LogLevelDebug, "dev1: "))
|
||||
dev1.Up()
|
||||
defer dev1.Close()
|
||||
if err := dev1.IpcSetOperation(bufio.NewReader(strings.NewReader(cfg1))); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
tun := newDummyTUN("dummy")
|
||||
logger := NewLogger(LogLevelError, "")
|
||||
device := NewDevice(tun, logger)
|
||||
device.SetPrivateKey(sk)
|
||||
return device
|
||||
|
||||
cfg2 := `private_key=98c7989b1661a0d64fd6af3502000f87716b7c4bbcf00d04fc6073aa7b539768
|
||||
listen_port=53512
|
||||
replace_peers=true
|
||||
public_key=49e80929259cebdda4f322d6d2b1a6fad819d603acd26fd5d845e7a123036427
|
||||
protocol_version=1
|
||||
replace_allowed_ips=true
|
||||
allowed_ip=1.0.0.1/32
|
||||
endpoint=127.0.0.1:53511`
|
||||
tun2 := NewChannelTUN()
|
||||
dev2 := NewDevice(tun2.TUN(), NewLogger(LogLevelDebug, "dev2: "))
|
||||
dev2.Up()
|
||||
defer dev2.Close()
|
||||
if err := dev2.IpcSetOperation(bufio.NewReader(strings.NewReader(cfg2))); err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
t.Run("ping 1.0.0.1", func(t *testing.T) {
|
||||
msg2to1 := ping(net.ParseIP("1.0.0.1"), net.ParseIP("1.0.0.2"))
|
||||
tun2.Outbound <- msg2to1
|
||||
select {
|
||||
case msgRecv := <-tun1.Inbound:
|
||||
if !bytes.Equal(msg2to1, msgRecv) {
|
||||
t.Error("ping did not transit correctly")
|
||||
}
|
||||
case <-time.After(300 * time.Millisecond):
|
||||
t.Error("ping did not transit")
|
||||
}
|
||||
})
|
||||
|
||||
t.Run("ping 1.0.0.2", func(t *testing.T) {
|
||||
msg1to2 := ping(net.ParseIP("1.0.0.2"), net.ParseIP("1.0.0.1"))
|
||||
tun1.Outbound <- msg1to2
|
||||
select {
|
||||
case msgRecv := <-tun2.Inbound:
|
||||
if !bytes.Equal(msg1to2, msgRecv) {
|
||||
t.Error("return ping did not transit correctly")
|
||||
}
|
||||
case <-time.After(300 * time.Millisecond):
|
||||
t.Error("return ping did not transit")
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
func ping(dst, src net.IP) []byte {
|
||||
localPort := uint16(1337)
|
||||
seq := uint16(0)
|
||||
|
||||
payload := make([]byte, 4)
|
||||
binary.BigEndian.PutUint16(payload[0:], localPort)
|
||||
binary.BigEndian.PutUint16(payload[2:], seq)
|
||||
|
||||
return genICMPv4(payload, dst, src)
|
||||
}
|
||||
|
||||
// checksum is the "internet checksum" from https://tools.ietf.org/html/rfc1071.
|
||||
func checksum(buf []byte, initial uint16) uint16 {
|
||||
v := uint32(initial)
|
||||
for i := 0; i < len(buf)-1; i += 2 {
|
||||
v += uint32(binary.BigEndian.Uint16(buf[i:]))
|
||||
}
|
||||
if len(buf)%2 == 1 {
|
||||
v += uint32(buf[len(buf)-1]) << 8
|
||||
}
|
||||
for v > 0xffff {
|
||||
v = (v >> 16) + (v & 0xffff)
|
||||
}
|
||||
return ^uint16(v)
|
||||
}
|
||||
|
||||
func genICMPv4(payload []byte, dst, src net.IP) []byte {
|
||||
const (
|
||||
icmpv4ProtocolNumber = 1
|
||||
icmpv4Echo = 8
|
||||
icmpv4ChecksumOffset = 2
|
||||
icmpv4Size = 8
|
||||
ipv4Size = 20
|
||||
ipv4TotalLenOffset = 2
|
||||
ipv4ChecksumOffset = 10
|
||||
ttl = 65
|
||||
)
|
||||
|
||||
hdr := make([]byte, ipv4Size+icmpv4Size)
|
||||
|
||||
ip := hdr[0:ipv4Size]
|
||||
icmpv4 := hdr[ipv4Size : ipv4Size+icmpv4Size]
|
||||
|
||||
// https://tools.ietf.org/html/rfc792
|
||||
icmpv4[0] = icmpv4Echo // type
|
||||
icmpv4[1] = 0 // code
|
||||
chksum := ^checksum(icmpv4, checksum(payload, 0))
|
||||
binary.BigEndian.PutUint16(icmpv4[icmpv4ChecksumOffset:], chksum)
|
||||
|
||||
// https://tools.ietf.org/html/rfc760 section 3.1
|
||||
length := uint16(len(hdr) + len(payload))
|
||||
ip[0] = (4 << 4) | (ipv4Size / 4)
|
||||
binary.BigEndian.PutUint16(ip[ipv4TotalLenOffset:], length)
|
||||
ip[8] = ttl
|
||||
ip[9] = icmpv4ProtocolNumber
|
||||
copy(ip[12:], src.To4())
|
||||
copy(ip[16:], dst.To4())
|
||||
chksum = ^checksum(ip[:], 0)
|
||||
binary.BigEndian.PutUint16(ip[ipv4ChecksumOffset:], chksum)
|
||||
|
||||
var v []byte
|
||||
v = append(v, hdr...)
|
||||
v = append(v, payload...)
|
||||
return []byte(v)
|
||||
}
|
||||
|
||||
// TODO(crawshaw): find a reusable home for this. package devicetest?
|
||||
type ChannelTUN struct {
|
||||
Inbound chan []byte // incoming packets, closed on TUN close
|
||||
Outbound chan []byte // outbound packets, blocks forever on TUN close
|
||||
|
||||
closed chan struct{}
|
||||
events chan tun.Event
|
||||
tun chTun
|
||||
}
|
||||
|
||||
func NewChannelTUN() *ChannelTUN {
|
||||
c := &ChannelTUN{
|
||||
Inbound: make(chan []byte),
|
||||
Outbound: make(chan []byte),
|
||||
closed: make(chan struct{}),
|
||||
events: make(chan tun.Event, 1),
|
||||
}
|
||||
c.tun.c = c
|
||||
c.events <- tun.EventUp
|
||||
return c
|
||||
}
|
||||
|
||||
func (c *ChannelTUN) TUN() tun.Device {
|
||||
return &c.tun
|
||||
}
|
||||
|
||||
type chTun struct {
|
||||
c *ChannelTUN
|
||||
}
|
||||
|
||||
func (t *chTun) File() *os.File { return nil }
|
||||
|
||||
func (t *chTun) Read(data []byte, offset int) (int, error) {
|
||||
select {
|
||||
case <-t.c.closed:
|
||||
return 0, io.EOF // TODO(crawshaw): what is the correct error value?
|
||||
case msg := <-t.c.Outbound:
|
||||
return copy(data[offset:], msg), nil
|
||||
}
|
||||
}
|
||||
|
||||
// Write is called by the wireguard device to deliver a packet for routing.
|
||||
func (t *chTun) Write(data []byte, offset int) (int, error) {
|
||||
if offset == -1 {
|
||||
close(t.c.closed)
|
||||
close(t.c.events)
|
||||
return 0, io.EOF
|
||||
}
|
||||
msg := make([]byte, len(data)-offset)
|
||||
copy(msg, data[offset:])
|
||||
select {
|
||||
case <-t.c.closed:
|
||||
return 0, io.EOF // TODO(crawshaw): what is the correct error value?
|
||||
case t.c.Inbound <- msg:
|
||||
return len(data) - offset, nil
|
||||
}
|
||||
}
|
||||
|
||||
func (t *chTun) Flush() error { return nil }
|
||||
func (t *chTun) MTU() (int, error) { return DefaultMTU, nil }
|
||||
func (t *chTun) Name() (string, error) { return "loopbackTun1", nil }
|
||||
func (t *chTun) Events() chan tun.Event { return t.c.events }
|
||||
func (t *chTun) Close() error {
|
||||
t.Write(nil, -1)
|
||||
return nil
|
||||
}
|
||||
|
||||
func assertNil(t *testing.T, err error) {
|
||||
@ -66,3 +224,15 @@ func assertEqual(t *testing.T, a, b []byte) {
|
||||
t.Fatal(a, "!=", b)
|
||||
}
|
||||
}
|
||||
|
||||
func randDevice(t *testing.T) *Device {
|
||||
sk, err := newPrivateKey()
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
tun := newDummyTUN("dummy")
|
||||
logger := NewLogger(LogLevelError, "")
|
||||
device := NewDevice(tun, logger)
|
||||
device.SetPrivateKey(sk)
|
||||
return device
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user