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package quic
import (
"testing"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/internal/qerr"
"github.com/quic-go/quic-go/internal/wire"
"github.com/stretchr/testify/require"
)
func TestConnIDGeneratorIssueAndRetire(t *testing.T) {
t.Run("with initial client destination connection ID", func(t *testing.T) {
testConnIDGeneratorIssueAndRetire(t, true)
})
t.Run("without initial client destination connection ID", func(t *testing.T) {
testConnIDGeneratorIssueAndRetire(t, false)
})
}
func testConnIDGeneratorIssueAndRetire(t *testing.T, hasInitialClientDestConnID bool) {
var (
added []protocol.ConnectionID
retired []protocol.ConnectionID
)
var queuedFrames []wire.Frame
sr := newStatelessResetter(&StatelessResetKey{1, 2, 3, 4})
var initialClientDestConnID *protocol.ConnectionID
if hasInitialClientDestConnID {
connID := protocol.ParseConnectionID([]byte{2, 2, 2, 2})
initialClientDestConnID = &connID
}
g := newConnIDGenerator(
protocol.ParseConnectionID([]byte{1, 1, 1, 1}),
initialClientDestConnID,
func(c protocol.ConnectionID) { added = append(added, c) },
sr,
func(c protocol.ConnectionID) { t.Fatal("didn't expect conn ID removals") },
func(c protocol.ConnectionID) { retired = append(retired, c) },
func([]protocol.ConnectionID, []byte) {},
func(f wire.Frame) { queuedFrames = append(queuedFrames, f) },
&protocol.DefaultConnectionIDGenerator{ConnLen: 5},
)
require.Empty(t, added)
require.NoError(t, g.SetMaxActiveConnIDs(4))
require.Len(t, added, 3)
require.Len(t, queuedFrames, 3)
require.Empty(t, retired)
connIDs := make(map[uint64]protocol.ConnectionID)
// connection IDs 1, 2 and 3 were issued
for i, f := range queuedFrames {
ncid := f.(*wire.NewConnectionIDFrame)
require.EqualValues(t, i+1, ncid.SequenceNumber)
require.Equal(t, ncid.ConnectionID, added[i])
require.Equal(t, ncid.StatelessResetToken, sr.GetStatelessResetToken(ncid.ConnectionID))
connIDs[ncid.SequenceNumber] = ncid.ConnectionID
}
// completing the handshake retires the initial client destination connection ID
added = added[:0]
queuedFrames = queuedFrames[:0]
g.SetHandshakeComplete()
require.Empty(t, added)
require.Empty(t, queuedFrames)
if hasInitialClientDestConnID {
require.Equal(t, []protocol.ConnectionID{*initialClientDestConnID}, retired)
retired = retired[:0]
} else {
require.Empty(t, retired)
}
// it's invalid to retire a connection ID that hasn't been issued yet
err := g.Retire(4, protocol.ParseConnectionID([]byte{3, 3, 3, 3}))
require.ErrorIs(t, &qerr.TransportError{ErrorCode: qerr.ProtocolViolation}, err)
require.ErrorContains(t, err, "retired connection ID 4 (highest issued: 3)")
// it's invalid to retire a connection ID in a packet that uses that connection ID
err = g.Retire(3, connIDs[3])
require.ErrorIs(t, err, &qerr.TransportError{ErrorCode: qerr.ProtocolViolation})
require.ErrorContains(t, err, "was used as the Destination Connection ID on this packet")
// retiring a connection ID makes us issue a new one
require.NoError(t, g.Retire(2, protocol.ParseConnectionID([]byte{3, 3, 3, 3})))
require.Equal(t, []protocol.ConnectionID{connIDs[2]}, retired)
require.Len(t, queuedFrames, 1)
require.EqualValues(t, 4, queuedFrames[0].(*wire.NewConnectionIDFrame).SequenceNumber)
queuedFrames = queuedFrames[:0]
retired = retired[:0]
// duplicate retirements don't do anything
require.NoError(t, g.Retire(2, protocol.ParseConnectionID([]byte{3, 3, 3, 3})))
require.Empty(t, queuedFrames)
require.Empty(t, retired)
}
func TestConnIDGeneratorRemoveAll(t *testing.T) {
t.Run("with initial client destination connection ID", func(t *testing.T) {
testConnIDGeneratorRemoveAll(t, true)
})
t.Run("without initial client destination connection ID", func(t *testing.T) {
testConnIDGeneratorRemoveAll(t, false)
})
}
func testConnIDGeneratorRemoveAll(t *testing.T, hasInitialClientDestConnID bool) {
var initialClientDestConnID *protocol.ConnectionID
if hasInitialClientDestConnID {
connID := protocol.ParseConnectionID([]byte{2, 2, 2, 2})
initialClientDestConnID = &connID
}
var (
added []protocol.ConnectionID
removed []protocol.ConnectionID
)
g := newConnIDGenerator(
protocol.ParseConnectionID([]byte{1, 1, 1, 1}),
initialClientDestConnID,
func(c protocol.ConnectionID) { added = append(added, c) },
newStatelessResetter(&StatelessResetKey{1, 2, 3, 4}),
func(c protocol.ConnectionID) { removed = append(removed, c) },
func(c protocol.ConnectionID) { t.Fatal("didn't expect conn ID retirements") },
func([]protocol.ConnectionID, []byte) {},
func(f wire.Frame) {},
&protocol.DefaultConnectionIDGenerator{ConnLen: 5},
)
require.NoError(t, g.SetMaxActiveConnIDs(1000))
require.Len(t, added, protocol.MaxIssuedConnectionIDs-1)
g.RemoveAll()
if hasInitialClientDestConnID {
require.Len(t, removed, protocol.MaxIssuedConnectionIDs+1)
require.Contains(t, removed, *initialClientDestConnID)
} else {
require.Len(t, removed, protocol.MaxIssuedConnectionIDs)
}
for _, id := range added {
require.Contains(t, removed, id)
}
require.Contains(t, removed, protocol.ParseConnectionID([]byte{1, 1, 1, 1}))
}
func TestConnIDGeneratorReplaceWithClosed(t *testing.T) {
t.Run("with initial client destination connection ID", func(t *testing.T) {
testConnIDGeneratorReplaceWithClosed(t, true)
})
t.Run("without initial client destination connection ID", func(t *testing.T) {
testConnIDGeneratorReplaceWithClosed(t, false)
})
}
func testConnIDGeneratorReplaceWithClosed(t *testing.T, hasInitialClientDestConnID bool) {
var initialClientDestConnID *protocol.ConnectionID
if hasInitialClientDestConnID {
connID := protocol.ParseConnectionID([]byte{2, 2, 2, 2})
initialClientDestConnID = &connID
}
var (
added []protocol.ConnectionID
replaced []protocol.ConnectionID
replacedWith []byte
)
g := newConnIDGenerator(
protocol.ParseConnectionID([]byte{1, 1, 1, 1}),
initialClientDestConnID,
func(c protocol.ConnectionID) { added = append(added, c) },
newStatelessResetter(&StatelessResetKey{1, 2, 3, 4}),
func(c protocol.ConnectionID) { t.Fatal("didn't expect conn ID removals") },
func(c protocol.ConnectionID) { t.Fatal("didn't expect conn ID retirements") },
func(connIDs []protocol.ConnectionID, b []byte) {
replaced = connIDs
replacedWith = b
},
func(f wire.Frame) {},
&protocol.DefaultConnectionIDGenerator{ConnLen: 5},
)
require.NoError(t, g.SetMaxActiveConnIDs(1000))
require.Len(t, added, protocol.MaxIssuedConnectionIDs-1)
g.ReplaceWithClosed([]byte("foobar"))
if hasInitialClientDestConnID {
require.Len(t, replaced, protocol.MaxIssuedConnectionIDs+1)
require.Contains(t, replaced, *initialClientDestConnID)
} else {
require.Len(t, replaced, protocol.MaxIssuedConnectionIDs)
}
for _, id := range added {
require.Contains(t, replaced, id)
}
require.Contains(t, replaced, protocol.ParseConnectionID([]byte{1, 1, 1, 1}))
require.Equal(t, []byte("foobar"), replacedWith)
}
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