Added undefined behavior sanitizer.

Combined common sanitizer flags.
Added fuzzers.

fuzzing/fuzz-LeaseSet2.cc

@@ -0,0 +1,38 @@
+
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include <LeaseSet.h>
+
+#include "fuzzing.h"
+
+
+bool
+fuzzing_testinput(const uint8_t * data, size_t size)
+{
+	uint8_t storeType;
+	i2p::data::LeaseSet2 * ls;
+
+
+	if(size < 1)
+		return true;
+
+	storeType = data[0];
+
+	// Same check as in NetDb::HandleDatabaseStoreMsg()
+	if(storeType == i2p::data::NETDB_STORE_TYPE_LEASESET)
+		return true;
+
+	data++;
+	size--;
+
+	// Same check as in NetDb::HandleDatabaseStoreMsg()
+	if(size > i2p::data::MAX_LS_BUFFER_SIZE)
+		return true;
+
+	ls = new i2p::data::LeaseSet2(storeType, data, size, false);
+	delete ls;
+
+	return true;
+}