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package quic
import (
"net"
"net/netip"
"runtime"
"testing"
"time"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/internal/utils"
"github.com/stretchr/testify/require"
"go.uber.org/mock/gomock"
)
// Only if appendUDPSegmentSizeMsg actually appends a message (and isn't only a stub implementation),
// GSO is actually supported on this platform.
var platformSupportsGSO = len(appendUDPSegmentSizeMsg([]byte{}, 1337)) > 0
func TestSendConnLocalAndRemoteAddress(t *testing.T) {
remoteAddr := &net.UDPAddr{IP: net.IPv4(192, 168, 100, 200), Port: 1337}
rawConn := NewMockRawConn(gomock.NewController(t))
rawConn.EXPECT().LocalAddr().Return(&net.UDPAddr{IP: net.IPv4(10, 11, 12, 13), Port: 14}).Times(2)
c := newSendConn(
rawConn,
remoteAddr,
packetInfo{addr: netip.AddrFrom4([4]byte{127, 0, 0, 42})},
utils.DefaultLogger,
)
require.Equal(t, "127.0.0.42:14", c.LocalAddr().String())
require.Equal(t, remoteAddr, c.RemoteAddr())
// the local raw conn's local address is only used if we don't an address from the packet info
c = newSendConn(rawConn, remoteAddr, packetInfo{}, utils.DefaultLogger)
require.Equal(t, "10.11.12.13:14", c.LocalAddr().String())
}
func TestSendConnOOB(t *testing.T) {
if runtime.GOOS == "windows" {
t.Skip("we don't OOB conn on windows, and no packet info will be available")
}
remoteAddr := &net.UDPAddr{IP: net.IPv4(192, 168, 100, 200), Port: 1337}
rawConn := NewMockRawConn(gomock.NewController(t))
rawConn.EXPECT().LocalAddr()
rawConn.EXPECT().capabilities().AnyTimes()
pi := packetInfo{addr: netip.IPv6Loopback()}
rawConn.EXPECT().WritePacket([]byte("foobar"), remoteAddr, pi.OOB(), uint16(0), protocol.ECT1)
require.NotEmpty(t, pi.OOB())
c := newSendConn(rawConn, remoteAddr, pi, utils.DefaultLogger)
require.NoError(t, c.Write([]byte("foobar"), 0, protocol.ECT1))
}
func TestSendConnDetectGSOFailure(t *testing.T) {
if !platformSupportsGSO {
t.Skip("GSO is not supported on this platform")
}
remoteAddr := &net.UDPAddr{IP: net.IPv4(192, 168, 100, 200), Port: 1337}
rawConn := NewMockRawConn(gomock.NewController(t))
rawConn.EXPECT().LocalAddr()
rawConn.EXPECT().capabilities().Return(connCapabilities{GSO: true}).MinTimes(1)
c := newSendConn(rawConn, remoteAddr, packetInfo{}, utils.DefaultLogger)
gomock.InOrder(
rawConn.EXPECT().WritePacket([]byte("foobar"), remoteAddr, gomock.Any(), uint16(4), protocol.ECNCE).Return(0, errGSO),
rawConn.EXPECT().WritePacket([]byte("foob"), remoteAddr, gomock.Any(), uint16(0), protocol.ECNCE).Return(4, nil),
rawConn.EXPECT().WritePacket([]byte("ar"), remoteAddr, gomock.Any(), uint16(0), protocol.ECNCE).Return(2, nil),
)
require.NoError(t, c.Write([]byte("foobar"), 4, protocol.ECNCE))
require.False(t, c.capabilities().GSO)
}
func TestSendConnSendmsgFailures(t *testing.T) {
if runtime.GOOS != "linux" {
t.Skip("only Linux exhibits this bug, we don't need to work around it on other platforms")
}
remoteAddr := &net.UDPAddr{IP: net.IPv4(192, 168, 100, 200), Port: 1337}
t.Run("first call to sendmsg fails", func(t *testing.T) {
rawConn := NewMockRawConn(gomock.NewController(t))
rawConn.EXPECT().LocalAddr()
rawConn.EXPECT().capabilities().AnyTimes()
c := newSendConn(rawConn, remoteAddr, packetInfo{}, utils.DefaultLogger)
gomock.InOrder(
rawConn.EXPECT().WritePacket([]byte("foobar"), remoteAddr, gomock.Any(), gomock.Any(), protocol.ECNCE).Return(0, errNotPermitted),
rawConn.EXPECT().WritePacket([]byte("foobar"), remoteAddr, gomock.Any(), uint16(0), protocol.ECNCE).Return(6, nil),
)
require.NoError(t, c.Write([]byte("foobar"), 0, protocol.ECNCE))
})
t.Run("later call to sendmsg fails", func(t *testing.T) {
rawConn := NewMockRawConn(gomock.NewController(t))
rawConn.EXPECT().LocalAddr()
rawConn.EXPECT().capabilities().AnyTimes()
c := newSendConn(rawConn, remoteAddr, packetInfo{}, utils.DefaultLogger)
rawConn.EXPECT().WritePacket([]byte("foobar"), remoteAddr, gomock.Any(), gomock.Any(), protocol.ECNCE).Return(0, errNotPermitted).Times(2)
require.Error(t, c.Write([]byte("foobar"), 0, protocol.ECNCE))
})
}
func TestSendConnRemoteAddrChange(t *testing.T) {
ln1 := newUDPConnLocalhost(t)
ln2 := newUDPConnLocalhost(t)
c := newSendConn(
&basicConn{PacketConn: newUDPConnLocalhost(t)},
ln1.LocalAddr(),
packetInfo{},
utils.DefaultLogger,
)
require.NoError(t, c.Write([]byte("foobar"), 0, protocol.ECNUnsupported))
ln1.SetReadDeadline(time.Now().Add(time.Second))
b := make([]byte, 1024)
n, err := ln1.Read(b)
require.NoError(t, err)
require.Equal(t, "foobar", string(b[:n]))
require.NoError(t, c.WriteTo([]byte("foobaz"), ln2.LocalAddr()))
ln2.SetReadDeadline(time.Now().Add(time.Second))
b = make([]byte, 1024)
n, err = ln2.Read(b)
require.NoError(t, err)
require.Equal(t, "foobaz", string(b[:n]))
c.ChangeRemoteAddr(ln2.LocalAddr(), packetInfo{})
require.NoError(t, c.Write([]byte("lorem ipsum"), 0, protocol.ECNUnsupported))
ln2.SetReadDeadline(time.Now().Add(time.Second))
b = make([]byte, 1024)
n, err = ln2.Read(b)
require.NoError(t, err)
require.Equal(t, "lorem ipsum", string(b[:n]))
}
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