113 lines
2.9 KiB
Go
113 lines
2.9 KiB
Go
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// +build gofuzz
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package lnwirefuzz
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import (
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"bytes"
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"reflect"
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"github.com/lightningnetwork/lnd/lnwire"
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)
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// Fuzz_node_announcement is used by go-fuzz.
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func Fuzz_node_announcement(data []byte) int {
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// Prefix with MsgNodeAnnouncement.
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data = prefixWithMsgType(data, lnwire.MsgNodeAnnouncement)
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// Create an empty message so that the FuzzHarness func can check
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// if the max payload constraint is violated.
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emptyMsg := lnwire.NodeAnnouncement{}
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// We have to do this here instead of in fuzz.Harness so that
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// reflect.DeepEqual isn't called. Address (de)serialization messes up
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// the fuzzing assertions.
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// Create a reader with the byte array.
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r := bytes.NewReader(data)
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// Make sure byte array length (excluding 2 bytes for message type) is
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// less than max payload size for the wire message. We check this because
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// otherwise `go-fuzz` will keep creating inputs that crash on ReadMessage
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// due to a large message size.
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payloadLen := uint32(len(data)) - 2
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if payloadLen > emptyMsg.MaxPayloadLength(0) {
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// Ignore this input - max payload constraint violated.
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return -1
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}
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msg, err := lnwire.ReadMessage(r, 0)
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if err != nil {
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// go-fuzz generated []byte that cannot be represented as a
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// wire message but we will return 0 so go-fuzz can modify the
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// input.
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return 0
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}
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// We will serialize the message into a new bytes buffer.
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var b bytes.Buffer
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if _, err := lnwire.WriteMessage(&b, msg, 0); err != nil {
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// Could not serialize message into bytes buffer, panic
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panic(err)
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}
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// Deserialize the message from the serialized bytes buffer, and then
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// assert that the original message is equal to the newly deserialized
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// message.
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newMsg, err := lnwire.ReadMessage(&b, 0)
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if err != nil {
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// Could not deserialize message from bytes buffer, panic
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panic(err)
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}
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// Now compare every field instead of using reflect.DeepEqual for the
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// Addresses field.
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var shouldPanic bool
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first := msg.(*lnwire.NodeAnnouncement)
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second := newMsg.(*lnwire.NodeAnnouncement)
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if !bytes.Equal(first.Signature[:], second.Signature[:]) {
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shouldPanic = true
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}
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if !reflect.DeepEqual(first.Features, second.Features) {
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shouldPanic = true
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}
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if first.Timestamp != second.Timestamp {
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shouldPanic = true
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}
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if !bytes.Equal(first.NodeID[:], second.NodeID[:]) {
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shouldPanic = true
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}
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if !reflect.DeepEqual(first.RGBColor, second.RGBColor) {
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shouldPanic = true
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}
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if !bytes.Equal(first.Alias[:], second.Alias[:]) {
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shouldPanic = true
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}
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if len(first.Addresses) != len(second.Addresses) {
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shouldPanic = true
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}
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for i := range first.Addresses {
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if first.Addresses[i].String() != second.Addresses[i].String() {
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shouldPanic = true
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break
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}
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}
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if !reflect.DeepEqual(first.ExtraOpaqueData, second.ExtraOpaqueData) {
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shouldPanic = true
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}
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if shouldPanic {
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panic("original message and deserialized message are not equal")
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}
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// Add this input to the corpus.
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return 1
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}
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