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package quic
import (
"crypto/rand"
"net"
"testing"
"github.com/quic-go/quic-go/internal/ackhandler"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/internal/utils"
"github.com/quic-go/quic-go/internal/wire"
"github.com/stretchr/testify/require"
)
// The path is established by receiving a non-probing packet.
// The first non-probing packet is received after path validation has completed.
// This is the typical scenario when the client initiates connection migration.
func TestPathManagerIntentionalMigration(t *testing.T) {
connIDs := []protocol.ConnectionID{
protocol.ParseConnectionID([]byte{1, 2, 3, 4, 5, 6, 7, 8}),
protocol.ParseConnectionID([]byte{2, 3, 4, 5, 6, 7, 8, 9}),
protocol.ParseConnectionID([]byte{3, 4, 5, 6, 7, 8, 9, 0}),
}
var retiredConnIDs []protocol.ConnectionID
pm := newPathManager(
func(id pathID) (protocol.ConnectionID, bool) { return connIDs[id], true },
func(id pathID) { retiredConnIDs = append(retiredConnIDs, connIDs[id]) },
utils.DefaultLogger,
)
connID, f1, shouldSwitch := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
require.Equal(t, connIDs[0], connID)
require.NotNil(t, f1.Frame)
pc1 := f1.Frame.(*wire.PathChallengeFrame)
require.NotZero(t, pc1.Data)
require.False(t, shouldSwitch)
// receiving another packet for the same path doesn't trigger another PATH_CHALLENGE
connID, f, shouldSwitch := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
require.Zero(t, connID)
require.Nil(t, f.Frame)
require.False(t, shouldSwitch)
// receiving a packet for a different path triggers another PATH_CHALLENGE
addr2 := &net.UDPAddr{IP: net.IPv4(5, 6, 7, 8), Port: 1000}
connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: addr2}, false)
require.Equal(t, connIDs[1], connID)
require.NotNil(t, f.Frame)
pc2 := f.Frame.(*wire.PathChallengeFrame)
require.NotEqual(t, pc1.Data, pc2.Data)
require.False(t, shouldSwitch)
// acknowledging the PATH_CHALLENGE doesn't confirm the path
f1.Handler.OnAcked(f1.Frame)
connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
require.Zero(t, connID)
require.Nil(t, f.Frame)
require.False(t, shouldSwitch)
// receiving a PATH_RESPONSE for the second path confirms the path
pm.HandlePathResponseFrame(&wire.PathResponseFrame{Data: pc2.Data})
connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: addr2}, false)
require.Zero(t, connID)
require.Nil(t, f.Frame)
require.False(t, shouldSwitch) // no non-probing packet received yet
require.Empty(t, retiredConnIDs)
// confirming the path doesn't remove other paths
connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
require.Zero(t, connID)
require.Nil(t, f.Frame)
require.False(t, shouldSwitch)
// now receive a non-probing packet for the new path
connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(5, 6, 7, 8), Port: 1000}}, true)
require.Zero(t, connID)
require.Nil(t, f.Frame)
require.True(t, shouldSwitch)
// now switch to the new path
pm.SwitchToPath(&net.UDPAddr{IP: net.IPv4(5, 6, 7, 8), Port: 1000})
// switching to the path removes other paths
connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
require.Equal(t, connIDs[2], connID)
require.NotNil(t, f.Frame)
require.NotEqual(t, f.Frame.(*wire.PathChallengeFrame).Data, pc1.Data)
require.False(t, shouldSwitch)
require.Equal(t, []protocol.ConnectionID{connIDs[0]}, retiredConnIDs)
}
// The first packet received on the new path is already a non-probing packet.
// We still need to validate the new path, but we can then switch over immediately.
// This is the typical scenario when a NAT rebinding happens.
func TestPathManagerNATRebinding(t *testing.T) {
connIDs := []protocol.ConnectionID{
protocol.ParseConnectionID([]byte{1, 2, 3, 4, 5, 6, 7, 8}),
}
var retiredConnIDs []protocol.ConnectionID
pm := newPathManager(
func(id pathID) (protocol.ConnectionID, bool) { return connIDs[id], true },
func(id pathID) { retiredConnIDs = append(retiredConnIDs, connIDs[id]) },
utils.DefaultLogger,
)
connID, f, shouldSwitch := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, true)
require.Equal(t, connIDs[0], connID)
require.NotNil(t, f.Frame)
pc1 := f.Frame.(*wire.PathChallengeFrame)
require.NotZero(t, pc1.Data)
require.False(t, shouldSwitch)
// receiving a PATH_RESPONSE for the second path confirms the path
pm.HandlePathResponseFrame(&wire.PathResponseFrame{Data: pc1.Data})
// we now switch to the new path, as soon as the next packet on that path is received
connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
require.Zero(t, connID)
require.Nil(t, f.Frame)
require.True(t, shouldSwitch)
}
func TestPathManagerLimits(t *testing.T) {
var connIDs []protocol.ConnectionID
for range 2*maxPaths + 1 {
b := make([]byte, 8)
rand.Read(b)
connIDs = append(connIDs, protocol.ParseConnectionID(b))
}
var retiredConnIDs []protocol.ConnectionID
pm := newPathManager(
func(id pathID) (protocol.ConnectionID, bool) { return connIDs[id], true },
func(id pathID) { retiredConnIDs = append(retiredConnIDs, connIDs[id]) },
utils.DefaultLogger,
)
for i := range maxPaths {
connID, f, _ := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000 + i}}, true)
require.NotNil(t, f.Frame)
require.Equal(t, connIDs[i], connID)
}
// the maximum number of paths is already being probed
connID, f, _ := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 2000}}, true)
require.Zero(t, connID)
require.Nil(t, f.Frame)
// switching to a new path frees is up all paths
var f1 ackhandler.Frame
pm.SwitchToPath(&net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000})
for i := range maxPaths {
connID, f, _ := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 3000 + i}}, true)
if i == 0 {
f1 = f
}
require.NotNil(t, f.Frame)
require.Equal(t, connIDs[maxPaths+i], connID)
}
// again, the maximum number of paths is already being probed
connID, f, _ = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 2000}}, true)
require.Zero(t, connID)
require.Nil(t, f.Frame)
// losing the frame removes this path
f1.Handler.OnLost(f1.Frame)
// we can open exactly one more path
connID, f, _ = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 4000}}, true)
require.NotNil(t, f.Frame)
require.Equal(t, connIDs[2*maxPaths], connID)
connID, f, _ = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 4001}}, true)
require.Zero(t, connID)
require.Nil(t, f.Frame)
}
type mockAddr struct {
str string
}
func (a *mockAddr) Network() string { return "mock" }
func (a *mockAddr) String() string { return a.str }
func TestAddrsEqual(t *testing.T) {
tests := []struct {
name string
addr1 net.Addr
addr2 net.Addr
expected bool
}{
{
name: "nil addresses",
addr1: nil,
addr2: nil,
expected: false,
},
{
name: "one nil address",
addr1: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
addr2: nil,
expected: false,
},
{
name: "same IPv4 addresses",
addr1: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
addr2: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
expected: true,
},
{
name: "different IPv4 addresses",
addr1: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
addr2: &net.UDPAddr{IP: net.IPv4(4, 3, 2, 1), Port: 1234},
expected: false,
},
{
name: "different ports",
addr1: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
addr2: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 4321},
expected: false,
},
{
name: "same IPv6 addresses",
addr1: &net.UDPAddr{IP: net.ParseIP("2001:db8::1"), Port: 1234},
addr2: &net.UDPAddr{IP: net.ParseIP("2001:db8::1"), Port: 1234},
expected: true,
},
{
name: "different IPv6 addresses",
addr1: &net.UDPAddr{IP: net.ParseIP("2001:db8::1"), Port: 1234},
addr2: &net.UDPAddr{IP: net.ParseIP("2001:db8::2"), Port: 1234},
expected: false,
},
{
name: "non-UDP addresses with same string representation",
addr1: &mockAddr{str: "192.0.2.1:1234"},
addr2: &mockAddr{str: "192.0.2.1:1234"},
expected: true,
},
{
name: "non-UDP addresses with different string representation",
addr1: &mockAddr{str: "192.0.2.1:1234"},
addr2: &mockAddr{str: "192.0.2.2:1234"},
expected: false,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
result := addrsEqual(tt.addr1, tt.addr2)
require.Equal(t, tt.expected, result)
})
}
}
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