lnd.xprv/fuzz/lnwire/node_announcement.go

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// +build gofuzz
package lnwirefuzz
import (
"bytes"
"reflect"
"github.com/lightningnetwork/lnd/lnwire"
)
// Fuzz_node_announcement is used by go-fuzz.
func Fuzz_node_announcement(data []byte) int {
// Prefix with MsgNodeAnnouncement.
data = prefixWithMsgType(data, lnwire.MsgNodeAnnouncement)
// Create an empty message so that the FuzzHarness func can check
// if the max payload constraint is violated.
emptyMsg := lnwire.NodeAnnouncement{}
// We have to do this here instead of in fuzz.Harness so that
// reflect.DeepEqual isn't called. Address (de)serialization messes up
// the fuzzing assertions.
// 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
}
msg, err := lnwire.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
}
// We will serialize the message into a new bytes buffer.
var b bytes.Buffer
if _, err := lnwire.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 := lnwire.ReadMessage(&b, 0)
if err != nil {
// Could not deserialize message from bytes buffer, panic
panic(err)
}
// Now compare every field instead of using reflect.DeepEqual for the
// Addresses field.
var shouldPanic bool
first := msg.(*lnwire.NodeAnnouncement)
second := newMsg.(*lnwire.NodeAnnouncement)
if !bytes.Equal(first.Signature[:], second.Signature[:]) {
shouldPanic = true
}
if !reflect.DeepEqual(first.Features, second.Features) {
shouldPanic = true
}
if first.Timestamp != second.Timestamp {
shouldPanic = true
}
if !bytes.Equal(first.NodeID[:], second.NodeID[:]) {
shouldPanic = true
}
if !reflect.DeepEqual(first.RGBColor, second.RGBColor) {
shouldPanic = true
}
if !bytes.Equal(first.Alias[:], second.Alias[:]) {
shouldPanic = true
}
if len(first.Addresses) != len(second.Addresses) {
shouldPanic = true
}
for i := range first.Addresses {
if first.Addresses[i].String() != second.Addresses[i].String() {
shouldPanic = true
break
}
}
if !reflect.DeepEqual(first.ExtraOpaqueData, second.ExtraOpaqueData) {
shouldPanic = true
}
if shouldPanic {
panic("original message and deserialized message are not equal")
}
// Add this input to the corpus.
return 1
}