lnd.xprv/fuzz/wtwire/fuzz_utils.go

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2020-01-29 04:20:35 +03:00
// +build gofuzz
package wtwirefuzz
import (
"bytes"
"encoding/binary"
"fmt"
"reflect"
"github.com/lightningnetwork/lnd/watchtower/wtwire"
)
// prefixWithMsgType takes []byte and adds a wire protocol prefix
// to make the []byte into an actual message to be used in fuzzing.
func prefixWithMsgType(data []byte, prefix wtwire.MessageType) []byte {
var prefixBytes [2]byte
binary.BigEndian.PutUint16(prefixBytes[:], uint16(prefix))
data = append(prefixBytes[:], data...)
return data
}
// harness performs the actual fuzz testing of the appropriate wire message.
// This function will check that the passed-in message passes wire length checks,
// is a valid message once deserialized, and passes a sequence of serialization
// and deserialization checks. Returns an int that determines whether the input
// is unique or not.
func harness(data []byte, emptyMsg wtwire.Message) int {
// Create a reader with the byte array.
r := bytes.NewReader(data)
// Make sure byte array length (excluding 2 bytes for message type) is
// less than max payload size for the wire message. We check this because
// otherwise `go-fuzz` will keep creating inputs that crash on ReadMessage
// due to a large message size.
payloadLen := uint32(len(data)) - 2
if payloadLen > emptyMsg.MaxPayloadLength(0) {
// Ignore this input - max payload constraint violated.
return 1
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}
msg, err := wtwire.ReadMessage(r, 0)
if err != nil {
// go-fuzz generated []byte that cannot be represented as a
// wire message but we will return 0 so go-fuzz can modify the
// input.
return 1
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}
// We will serialize the message into a new bytes buffer.
var b bytes.Buffer
if _, err := wtwire.WriteMessage(&b, msg, 0); err != nil {
// Could not serialize message into bytes buffer, panic.
panic(err)
}
// Deserialize the message from the serialized bytes buffer, and then
// assert that the original message is equal to the newly deserialized
// message.
newMsg, err := wtwire.ReadMessage(&b, 0)
if err != nil {
// Could not deserialize message from bytes buffer, panic.
panic(err)
}
if !reflect.DeepEqual(msg, newMsg) {
// Deserialized message and original message are not
// deeply equal.
panic(fmt.Errorf("deserialized message and original message " +
"are not deeply equal."))
}
// Add this input to the corpus.
return 1
}