URLRequest fuzzer.

net/url_request/url_request_fuzzer.cc

Index: net/url_request/url_request_fuzzer.cc
diff --git a/net/url_request/url_request_fuzzer.cc b/net/url_request/url_request_fuzzer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f17647d68163c8468e785ee17acbdfdf77277738
--- /dev/null
+++ b/net/url_request/url_request_fuzzer.cc
@@ -0,0 +1,43 @@
+// Copyright 2016 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 "net/url_request/url_request.h"
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <memory>
+
+#include "base/run_loop.h"
+#include "net/base/fuzzed_data_provider.h"
+#include "net/base/request_priority.h"
+#include "net/socket/fuzzed_socket_factory.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_context.h"
+#include "net/url_request/url_request_test_util.h"
+#include "url/gurl.h"
+
+// Integration fuzzer for URLRequest's handling of HTTP requests. Can follow
+// redirects, both on the same server (using a new socket or the old one) and
+// across servers.
+// TODO(mmenke): Add support for testing HTTPS, FTP, auth, proxies, uploading,
+// cancelation, deferring reads / redirects, using preconnected sockets, SPDY,
+// QUIC, DNS failures (they all currently resolve to localhost), IPv6 DNS
+// results, URLs with IPs instead of hostnames (v4 and v6), etc.
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  net::FuzzedDataProvider data_provider(data, size);
+  net::TestURLRequestContext url_request_context(true);
+  net::FuzzedSocketFactory fuzzed_socket_factory(&data_provider);
+  url_request_context.set_client_socket_factory(&fuzzed_socket_factory);
+  url_request_context.Init();
+
+  net::TestDelegate delegate;
+
+  std::unique_ptr<net::URLRequest> url_request(
+      url_request_context.CreateRequest(GURL("http://foo/"),
+                                        net::DEFAULT_PRIORITY, &delegate));
+  url_request->Start();
+  base::RunLoop().Run();

[eroman, 2016/04/28 01:32:36]

Could you add a comment explaining that TestDelegate quits the loop on
completion?

[mmenke, 2016/04/28 16:01:38]

Done.

+  return 0;
+}