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package transportparameters
import (
"errors"
"fmt"
"github.com/quic-go/quic-go/fuzzing/internal/helper"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/internal/wire"
)
// PrefixLen is the number of bytes used for configuration
const PrefixLen = 1
// Fuzz fuzzes the QUIC transport parameters.
//
//go:generate go run ./cmd/corpus.go
func Fuzz(data []byte) int {
if len(data) <= PrefixLen {
return 0
}
if helper.NthBit(data[0], 0) {
return fuzzTransportParametersForSessionTicket(data[PrefixLen:])
}
return fuzzTransportParameters(data[PrefixLen:], helper.NthBit(data[0], 1))
}
func fuzzTransportParameters(data []byte, sentByServer bool) int {
sentBy := protocol.PerspectiveClient
if sentByServer {
sentBy = protocol.PerspectiveServer
}
tp := &wire.TransportParameters{}
if err := tp.Unmarshal(data, sentBy); err != nil {
return 0
}
_ = tp.String()
if err := validateTransportParameters(tp, sentBy); err != nil {
panic(err)
}
tp2 := &wire.TransportParameters{}
if err := tp2.Unmarshal(tp.Marshal(sentBy), sentBy); err != nil {
fmt.Printf("%#v\n", tp)
panic(err)
}
if err := validateTransportParameters(tp2, sentBy); err != nil {
panic(err)
}
return 1
}
func fuzzTransportParametersForSessionTicket(data []byte) int {
tp := &wire.TransportParameters{}
if err := tp.UnmarshalFromSessionTicket(data); err != nil {
return 0
}
b := tp.MarshalForSessionTicket(nil)
tp2 := &wire.TransportParameters{}
if err := tp2.UnmarshalFromSessionTicket(b); err != nil {
panic(err)
}
return 1
}
func validateTransportParameters(tp *wire.TransportParameters, sentBy protocol.Perspective) error {
if sentBy == protocol.PerspectiveClient && tp.StatelessResetToken != nil {
return errors.New("client's transport parameters contained stateless reset token")
}
if tp.MaxIdleTimeout < 0 {
return fmt.Errorf("negative max_idle_timeout: %s", tp.MaxIdleTimeout)
}
if tp.AckDelayExponent > 20 {
return fmt.Errorf("invalid ack_delay_exponent: %d", tp.AckDelayExponent)
}
if tp.MaxUDPPayloadSize < 1200 {
return fmt.Errorf("invalid max_udp_payload_size: %d", tp.MaxUDPPayloadSize)
}
if tp.ActiveConnectionIDLimit < 2 {
return fmt.Errorf("invalid active_connection_id_limit: %d", tp.ActiveConnectionIDLimit)
}
if tp.OriginalDestinationConnectionID.Len() > 20 {
return fmt.Errorf("invalid original_destination_connection_id length: %s", tp.InitialSourceConnectionID)
}
if tp.InitialSourceConnectionID.Len() > 20 {
return fmt.Errorf("invalid initial_source_connection_id length: %s", tp.InitialSourceConnectionID)
}
if tp.RetrySourceConnectionID != nil && tp.RetrySourceConnectionID.Len() > 20 {
return fmt.Errorf("invalid retry_source_connection_id length: %s", tp.RetrySourceConnectionID)
}
if tp.PreferredAddress != nil && tp.PreferredAddress.ConnectionID.Len() > 20 {
return fmt.Errorf("invalid preferred_address connection ID length: %s", tp.PreferredAddress.ConnectionID)
}
return nil
}
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