From 35f4bb96f313f4f04e70d1cf135be3a4759a8179 Mon Sep 17 00:00:00 2001
From: obscuren <geffobscura@gmail.com>
Date: Fri, 9 Jan 2015 16:44:09 +0100
Subject: Limit hashes. Closes #249

---
 eth/protocol.go | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/eth/protocol.go b/eth/protocol.go
index c9a5dea8d..24a0f0a8e 100644
--- a/eth/protocol.go
+++ b/eth/protocol.go
@@ -67,6 +67,8 @@ type newBlockMsgData struct {
 	TD    *big.Int
 }
 
+const maxHashes = 255
+
 type getBlockHashesMsgData struct {
 	Hash   []byte
 	Amount uint64
@@ -139,6 +141,11 @@ func (self *ethProtocol) handle() error {
 		if err := msg.Decode(&request); err != nil {
 			return self.protoError(ErrDecode, "->msg %v: %v", msg, err)
 		}
+
+		//request.Amount = uint64(math.Min(float64(maxHashes), float64(request.Amount)))
+		if request.Amount > maxHashes {
+			request.Amount = maxHashes
+		}
 		hashes := self.chainManager.GetBlockHashesFromHash(request.Hash, request.Amount)
 		return p2p.EncodeMsg(self.rw, BlockHashesMsg, ethutil.ByteSliceToInterface(hashes)...)
 
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