aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorDavid Crawshaw <crawshaw@tailscale.io>2019-10-12 12:44:05 -0400
committerJason A. Donenfeld <Jason@zx2c4.com>2019-10-15 15:49:43 +0200
commit590211bf4db5efb8ba39e94d0f01bee3d674e220 (patch)
treef2f6a846b8ae57347c893798ef32924332d10396
parentversion: bump snapshot (diff)
downloadwireguard-go-dc/devicetest.tar.xz
wireguard-go-dc/devicetest.zip
device: test packets between two fake devicesdc/devicetest
-rw-r--r--device/device_test.go228
1 files changed, 199 insertions, 29 deletions
diff --git a/device/device_test.go b/device/device_test.go
index cdbd458..14cc605 100644
--- a/device/device_test.go
+++ b/device/device_test.go
@@ -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) {
+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)
+ }
- // prepare tun devices for generating traffic
+ 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)
+ }
- tun1 := newDummyTUN("tun1")
- tun2 := newDummyTUN("tun2")
+ 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")
+ }
+ })
+}
- _ = tun1
- _ = tun2
+func ping(dst, src net.IP) []byte {
+ localPort := uint16(1337)
+ seq := uint16(0)
- // prepare endpoints
+ payload := make([]byte, 4)
+ binary.BigEndian.PutUint16(payload[0:], localPort)
+ binary.BigEndian.PutUint16(payload[2:], seq)
- end1, err := CreateDummyEndpoint()
- if err != nil {
- t.Error("failed to create endpoint:", err.Error())
+ 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)
+}
- end2, err := CreateDummyEndpoint()
- if err != nil {
- t.Error("failed to create endpoint:", err.Error())
+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
+}
- _ = end1
- _ = end2
+type chTun struct {
+ c *ChannelTUN
+}
- // create binds
+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
+ }
}
-func randDevice(t *testing.T) *Device {
- sk, err := newPrivateKey()
- if err != nil {
- t.Fatal(err)
+// 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
}
- tun := newDummyTUN("dummy")
- logger := NewLogger(LogLevelError, "")
- device := NewDevice(tun, logger)
- device.SetPrivateKey(sk)
- return device
+ 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
+}