DuelClient: discard too large packet

gframe/duelclient.cpp

@@ -20,6 +20,7 @@ bool DuelClient::is_host = false;
 event_base* DuelClient::client_base = 0;
 bufferevent* DuelClient::client_bev = 0;
 unsigned char DuelClient::duel_client_read[SIZE_NETWORK_BUFFER];
+int DuelClient::read_len = 0;
 unsigned char DuelClient::duel_client_write[SIZE_NETWORK_BUFFER];
 bool DuelClient::is_closing = false;
 bool DuelClient::is_swapping = false;
@@ -106,9 +107,15 @@ void DuelClient::ClientRead(bufferevent* bev, void* ctx) {
 		evbuffer_copyout(input, &packet_len, 2);
 		if(len < (size_t)packet_len + 2)
 			return;
-		evbuffer_remove(input, duel_client_read, packet_len + 2);
-		if(packet_len)
-			HandleSTOCPacketLan(&duel_client_read[2], packet_len);
+		if (packet_len + 2 > SIZE_NETWORK_BUFFER) {
+			evbuffer_drain(input, packet_len + 2);
+			read_len = 0;
+		}
+		else {
+			read_len = evbuffer_remove(input, duel_client_read, packet_len + 2);
+		}
+		if (read_len > 0)
+			HandleSTOCPacketLan(&duel_client_read[2], read_len - 2);
 		len -= packet_len + 2;
 	}
 }

gframe/duelclient.h

@@ -27,6 +27,7 @@ private:
 	static event_base* client_base;
 	static bufferevent* client_bev;
 	static unsigned char duel_client_read[SIZE_NETWORK_BUFFER];
+	static int read_len;
 	static unsigned char duel_client_write[SIZE_NETWORK_BUFFER];
 	static bool is_closing;
 	static bool is_swapping;
@@ -62,7 +63,7 @@ public:
 		auto p = duel_client_write;
 		int blen = sizeof(ST);
 		if (blen > MAX_DATA_SIZE)
-			blen = MAX_DATA_SIZE;
+			return;
 		BufferIO::WriteInt16(p, (short)(1 + blen));
 		BufferIO::WriteInt8(p, proto);
 		memcpy(p, &st, blen);