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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build go1.21
package quic
import (
"bytes"
"fmt"
"net"
"net/netip"
"runtime"
"testing"
)
func TestUDPSourceUnspecified(t *testing.T) {
// Send datagram with no source address set.
runUDPTest(t, func(t *testing.T, test udpTest) {
t.Logf("%v", test.dstAddr)
data := []byte("source unspecified")
if err := test.src.Write(datagram{
b: data,
peerAddr: test.dstAddr,
}); err != nil {
t.Fatalf("Write: %v", err)
}
got := <-test.dgramc
if !bytes.Equal(got.b, data) {
t.Errorf("got datagram {%x}, want {%x}", got.b, data)
}
})
}
func TestUDPSourceSpecified(t *testing.T) {
// Send datagram with source address set.
runUDPTest(t, func(t *testing.T, test udpTest) {
data := []byte("source specified")
if err := test.src.Write(datagram{
b: data,
peerAddr: test.dstAddr,
localAddr: test.src.LocalAddr(),
}); err != nil {
t.Fatalf("Write: %v", err)
}
got := <-test.dgramc
if !bytes.Equal(got.b, data) {
t.Errorf("got datagram {%x}, want {%x}", got.b, data)
}
})
}
func TestUDPSourceInvalid(t *testing.T) {
// Send datagram with source address set to an address not associated with the connection.
if !udpInvalidLocalAddrIsError {
t.Skipf("%v: sending from invalid source succeeds", runtime.GOOS)
}
runUDPTest(t, func(t *testing.T, test udpTest) {
var localAddr netip.AddrPort
if test.src.LocalAddr().Addr().Is4() {
localAddr = netip.MustParseAddrPort("127.0.0.2:1234")
} else {
localAddr = netip.MustParseAddrPort("[::2]:1234")
}
data := []byte("source invalid")
if err := test.src.Write(datagram{
b: data,
peerAddr: test.dstAddr,
localAddr: localAddr,
}); err == nil {
t.Errorf("Write with invalid localAddr succeeded; want error")
}
})
}
func TestUDPECN(t *testing.T) {
if !udpECNSupport {
t.Skipf("%v: no ECN support", runtime.GOOS)
}
// Send datagrams with ECN bits set, verify the ECN bits are received.
runUDPTest(t, func(t *testing.T, test udpTest) {
for _, ecn := range []ecnBits{ecnNotECT, ecnECT1, ecnECT0, ecnCE} {
if err := test.src.Write(datagram{
b: []byte{1, 2, 3, 4},
peerAddr: test.dstAddr,
ecn: ecn,
}); err != nil {
t.Fatalf("Write: %v", err)
}
got := <-test.dgramc
if got.ecn != ecn {
t.Errorf("sending ECN bits %x, got %x", ecn, got.ecn)
}
}
})
}
type udpTest struct {
src *netUDPConn
dst *netUDPConn
dstAddr netip.AddrPort
dgramc chan *datagram
}
// runUDPTest calls f with a pair of UDPConns in a matrix of network variations:
// udp, udp4, and udp6, and variations on binding to an unspecified address (0.0.0.0)
// or a specified one.
func runUDPTest(t *testing.T, f func(t *testing.T, u udpTest)) {
for _, test := range []struct {
srcNet, srcAddr, dstNet, dstAddr string
}{
{"udp4", "127.0.0.1", "udp", ""},
{"udp4", "127.0.0.1", "udp4", ""},
{"udp4", "127.0.0.1", "udp4", "127.0.0.1"},
{"udp6", "::1", "udp", ""},
{"udp6", "::1", "udp6", ""},
{"udp6", "::1", "udp6", "::1"},
} {
spec := "spec"
if test.dstAddr == "" {
spec = "unspec"
}
t.Run(fmt.Sprintf("%v/%v/%v", test.srcNet, test.dstNet, spec), func(t *testing.T) {
// See: https://go.googlesource.com/go/+/refs/tags/go1.22.0/src/net/ipsock.go#47
// On these platforms, conns with network="udp" cannot accept IPv6.
switch runtime.GOOS {
case "dragonfly", "openbsd":
if test.srcNet == "udp6" && test.dstNet == "udp" {
t.Skipf("%v: no support for mapping IPv4 address to IPv6", runtime.GOOS)
}
case "plan9":
t.Skipf("ReadMsgUDP not supported on %s", runtime.GOOS)
}
if runtime.GOARCH == "wasm" && test.srcNet == "udp6" {
t.Skipf("%v: IPv6 tests fail when using wasm fake net", runtime.GOARCH)
}
srcAddr := netip.AddrPortFrom(netip.MustParseAddr(test.srcAddr), 0)
srcConn, err := net.ListenUDP(test.srcNet, net.UDPAddrFromAddrPort(srcAddr))
if err != nil {
// If ListenUDP fails here, we presumably don't have
// IPv4/IPv6 configured.
t.Skipf("ListenUDP(%q, %v) = %v", test.srcNet, srcAddr, err)
}
t.Cleanup(func() { srcConn.Close() })
src, err := newNetUDPConn(srcConn)
if err != nil {
t.Fatalf("newNetUDPConn: %v", err)
}
var dstAddr netip.AddrPort
if test.dstAddr != "" {
dstAddr = netip.AddrPortFrom(netip.MustParseAddr(test.dstAddr), 0)
}
dstConn, err := net.ListenUDP(test.dstNet, net.UDPAddrFromAddrPort(dstAddr))
if err != nil {
t.Skipf("ListenUDP(%q, nil) = %v", test.dstNet, err)
}
dst, err := newNetUDPConn(dstConn)
if err != nil {
dstConn.Close()
t.Fatalf("newNetUDPConn: %v", err)
}
dgramc := make(chan *datagram)
go func() {
defer close(dgramc)
dst.Read(func(dgram *datagram) {
dgramc <- dgram
})
}()
t.Cleanup(func() {
dstConn.Close()
for range dgramc {
t.Errorf("test read unexpected datagram")
}
})
f(t, udpTest{
src: src,
dst: dst,
dstAddr: netip.AddrPortFrom(
srcAddr.Addr(),
dst.LocalAddr().Port(),
),
dgramc: dgramc,
})
})
}
}
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