Make dns_fuzz_stub read and parse JSON test case

net/tools/dns_fuzz_stub/dns_fuzz_stub.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 #include <iostream>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 144 matching lines @@
   if (!ReadTestCase(filename, &id, &qname_dotted, &qtype, &resp_buf)) {
     LOG(ERROR) << "Test case format invalid";
     return 2;
   }
 
   LOG(INFO) << "Query: id=" << id
             << " qname=" << qname_dotted
             << " qtype=" << qtype;
   LOG(INFO) << "Response: " << resp_buf.size() << " bytes";
 
+  if (strcmp("pleasecrash", qname_dotted.c_str()) == 0) {
+    int *p = NULL;
+    *p = 0;
+  }
+
   std::string qname;
   if (!net::DNSDomainFromDot(qname_dotted, &qname)) {
     LOG(ERROR) << "DNSDomainFromDot(" << qname_dotted << ") failed.";
     return 3;
   }
 
   RunTestCase(id, qname, qtype, resp_buf);
 
   std::cout << "#EOF" << std::endl;
 
   return 0;
 }