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https://github.com/refraction-networking/uquic.git
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7f5ea8a54d
The path manager is responsible for generating PATH_CHALLENGE frames and matching them with PATH_RESPONSE frames.
250 lines
9 KiB
Go
250 lines
9 KiB
Go
package quic
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import (
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"crypto/rand"
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"net"
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"testing"
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"github.com/quic-go/quic-go/internal/ackhandler"
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"github.com/quic-go/quic-go/internal/protocol"
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"github.com/quic-go/quic-go/internal/utils"
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"github.com/quic-go/quic-go/internal/wire"
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"github.com/stretchr/testify/require"
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)
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// The path is established by receiving a non-probing packet.
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// The first non-probing packet is received after path validation has completed.
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// This is the typical scenario when the client initiates connection migration.
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func TestPathManagerIntentionalMigration(t *testing.T) {
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connIDs := []protocol.ConnectionID{
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protocol.ParseConnectionID([]byte{1, 2, 3, 4, 5, 6, 7, 8}),
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protocol.ParseConnectionID([]byte{2, 3, 4, 5, 6, 7, 8, 9}),
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protocol.ParseConnectionID([]byte{3, 4, 5, 6, 7, 8, 9, 0}),
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}
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var retiredConnIDs []protocol.ConnectionID
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pm := newPathManager(
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func(id pathID) (protocol.ConnectionID, bool) { return connIDs[id], true },
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func(id pathID) { retiredConnIDs = append(retiredConnIDs, connIDs[id]) },
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utils.DefaultLogger,
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)
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connID, f1, shouldSwitch := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
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require.Equal(t, connIDs[0], connID)
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require.NotNil(t, f1.Frame)
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pc1 := f1.Frame.(*wire.PathChallengeFrame)
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require.NotZero(t, pc1.Data)
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require.False(t, shouldSwitch)
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// receiving another packet for the same path doesn't trigger another PATH_CHALLENGE
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connID, f, shouldSwitch := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
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require.Zero(t, connID)
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require.Nil(t, f.Frame)
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require.False(t, shouldSwitch)
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// receiving a packet for a different path triggers another PATH_CHALLENGE
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addr2 := &net.UDPAddr{IP: net.IPv4(5, 6, 7, 8), Port: 1000}
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connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: addr2}, false)
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require.Equal(t, connIDs[1], connID)
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require.NotNil(t, f.Frame)
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pc2 := f.Frame.(*wire.PathChallengeFrame)
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require.NotEqual(t, pc1.Data, pc2.Data)
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require.False(t, shouldSwitch)
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// acknowledging the PATH_CHALLENGE doesn't confirm the path
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f1.Handler.OnAcked(f1.Frame)
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connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
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require.Zero(t, connID)
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require.Nil(t, f.Frame)
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require.False(t, shouldSwitch)
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// receiving a PATH_RESPONSE for the second path confirms the path
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pm.HandlePathResponseFrame(&wire.PathResponseFrame{Data: pc2.Data})
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connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: addr2}, false)
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require.Zero(t, connID)
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require.Nil(t, f.Frame)
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require.False(t, shouldSwitch) // no non-probing packet received yet
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require.Empty(t, retiredConnIDs)
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// confirming the path doesn't remove other paths
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connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
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require.Zero(t, connID)
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require.Nil(t, f.Frame)
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require.False(t, shouldSwitch)
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// now receive a non-probing packet for the new path
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connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(5, 6, 7, 8), Port: 1000}}, true)
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require.Zero(t, connID)
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require.Nil(t, f.Frame)
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require.True(t, shouldSwitch)
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// now switch to the new path
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pm.SwitchToPath(&net.UDPAddr{IP: net.IPv4(5, 6, 7, 8), Port: 1000})
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// switching to the path removes other paths
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connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
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require.Equal(t, connIDs[2], connID)
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require.NotNil(t, f.Frame)
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require.NotEqual(t, f.Frame.(*wire.PathChallengeFrame).Data, pc1.Data)
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require.False(t, shouldSwitch)
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require.Equal(t, []protocol.ConnectionID{connIDs[0]}, retiredConnIDs)
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}
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// The first packet received on the new path is already a non-probing packet.
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// We still need to validate the new path, but we can then switch over immediately.
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// This is the typical scenario when a NAT rebinding happens.
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func TestPathManagerNATRebinding(t *testing.T) {
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connIDs := []protocol.ConnectionID{
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protocol.ParseConnectionID([]byte{1, 2, 3, 4, 5, 6, 7, 8}),
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}
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var retiredConnIDs []protocol.ConnectionID
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pm := newPathManager(
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func(id pathID) (protocol.ConnectionID, bool) { return connIDs[id], true },
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func(id pathID) { retiredConnIDs = append(retiredConnIDs, connIDs[id]) },
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utils.DefaultLogger,
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)
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connID, f, shouldSwitch := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, true)
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require.Equal(t, connIDs[0], connID)
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require.NotNil(t, f.Frame)
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pc1 := f.Frame.(*wire.PathChallengeFrame)
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require.NotZero(t, pc1.Data)
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require.False(t, shouldSwitch)
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// receiving a PATH_RESPONSE for the second path confirms the path
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pm.HandlePathResponseFrame(&wire.PathResponseFrame{Data: pc1.Data})
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// we now switch to the new path, as soon as the next packet on that path is received
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connID, f, shouldSwitch = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000}}, false)
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require.Zero(t, connID)
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require.Nil(t, f.Frame)
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require.True(t, shouldSwitch)
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}
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func TestPathManagerLimits(t *testing.T) {
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var connIDs []protocol.ConnectionID
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for range 2*maxPaths + 1 {
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b := make([]byte, 8)
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rand.Read(b)
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connIDs = append(connIDs, protocol.ParseConnectionID(b))
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}
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var retiredConnIDs []protocol.ConnectionID
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pm := newPathManager(
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func(id pathID) (protocol.ConnectionID, bool) { return connIDs[id], true },
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func(id pathID) { retiredConnIDs = append(retiredConnIDs, connIDs[id]) },
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utils.DefaultLogger,
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)
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for i := range maxPaths {
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connID, f, _ := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000 + i}}, true)
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require.NotNil(t, f.Frame)
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require.Equal(t, connIDs[i], connID)
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}
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// the maximum number of paths is already being probed
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connID, f, _ := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 2000}}, true)
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require.Zero(t, connID)
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require.Nil(t, f.Frame)
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// switching to a new path frees is up all paths
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var f1 ackhandler.Frame
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pm.SwitchToPath(&net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1000})
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for i := range maxPaths {
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connID, f, _ := pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 3000 + i}}, true)
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if i == 0 {
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f1 = f
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}
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require.NotNil(t, f.Frame)
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require.Equal(t, connIDs[maxPaths+i], connID)
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}
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// again, the maximum number of paths is already being probed
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connID, f, _ = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 2000}}, true)
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require.Zero(t, connID)
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require.Nil(t, f.Frame)
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// losing the frame removes this path
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f1.Handler.OnLost(f1.Frame)
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// we can open exactly one more path
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connID, f, _ = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 4000}}, true)
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require.NotNil(t, f.Frame)
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require.Equal(t, connIDs[2*maxPaths], connID)
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connID, f, _ = pm.HandlePacket(receivedPacket{remoteAddr: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 4001}}, true)
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require.Zero(t, connID)
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require.Nil(t, f.Frame)
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}
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type mockAddr struct {
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str string
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}
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func (a *mockAddr) Network() string { return "mock" }
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func (a *mockAddr) String() string { return a.str }
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func TestAddrsEqual(t *testing.T) {
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tests := []struct {
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name string
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addr1 net.Addr
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addr2 net.Addr
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expected bool
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}{
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{
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name: "nil addresses",
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addr1: nil,
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addr2: nil,
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expected: false,
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},
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{
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name: "one nil address",
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addr1: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
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addr2: nil,
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expected: false,
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},
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{
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name: "same IPv4 addresses",
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addr1: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
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addr2: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
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expected: true,
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},
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{
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name: "different IPv4 addresses",
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addr1: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
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addr2: &net.UDPAddr{IP: net.IPv4(4, 3, 2, 1), Port: 1234},
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expected: false,
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},
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{
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name: "different ports",
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addr1: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 1234},
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addr2: &net.UDPAddr{IP: net.IPv4(1, 2, 3, 4), Port: 4321},
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expected: false,
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},
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{
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name: "same IPv6 addresses",
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addr1: &net.UDPAddr{IP: net.ParseIP("2001:db8::1"), Port: 1234},
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addr2: &net.UDPAddr{IP: net.ParseIP("2001:db8::1"), Port: 1234},
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expected: true,
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},
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{
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name: "different IPv6 addresses",
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addr1: &net.UDPAddr{IP: net.ParseIP("2001:db8::1"), Port: 1234},
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addr2: &net.UDPAddr{IP: net.ParseIP("2001:db8::2"), Port: 1234},
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expected: false,
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},
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{
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name: "non-UDP addresses with same string representation",
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addr1: &mockAddr{str: "192.0.2.1:1234"},
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addr2: &mockAddr{str: "192.0.2.1:1234"},
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expected: true,
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},
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{
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name: "non-UDP addresses with different string representation",
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addr1: &mockAddr{str: "192.0.2.1:1234"},
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addr2: &mockAddr{str: "192.0.2.2:1234"},
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expected: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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result := addrsEqual(tt.addr1, tt.addr2)
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require.Equal(t, tt.expected, result)
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})
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}
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}
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