URLRequest fuzzer.

net/http/http_proxy_client_socket_fuzzer.cc

 // 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/http/http_proxy_client_socket.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "net/base/address_list.h"
 #include "net/base/auth.h"
+#include "net/base/fuzzed_data_provider.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/test_completion_callback.h"
 #include "net/http/http_auth_cache.h"
 #include "net/http/http_auth_handler_basic.h"
 #include "net/http/http_auth_handler_digest.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_auth_scheme.h"
 #include "net/log/test_net_log.h"
 #include "net/socket/client_socket_handle.h"
 #include "net/socket/fuzzed_socket.h"
 #include "net/socket/next_proto.h"
 
 // Fuzzer for HttpProxyClientSocket only tests establishing a connection when
 // using the proxy as a tunnel.
 //
 // |data| is used to create a FuzzedSocket to fuzz reads and writes, see that
 // class for details.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   // Use a test NetLog, to exercise logging code.
-  net::BoundTestNetLog bound_test_net_log;
+  net::TestNetLog test_net_log;
 
-  // Use last byte to determine if the HttpProxyClientSocket should be told the
-  // underlying socket is HTTPS.
-  bool is_https_proxy = 0;
-  if (size > 0) {
-    is_https_proxy = !(data[size - 1] & 1);
-    size--;
-  }
+  net::FuzzedDataProvider data_provider(data, size);
 
   net::TestCompletionCallback callback;
   std::unique_ptr<net::FuzzedSocket> fuzzed_socket(
-      new net::FuzzedSocket(data, size, bound_test_net_log.bound()));
+      new net::FuzzedSocket(&data_provider, &test_net_log));
   CHECK_EQ(net::OK, fuzzed_socket->Connect(callback.callback()));
 
   std::unique_ptr<net::ClientSocketHandle> socket_handle(
       new net::ClientSocketHandle());
   socket_handle->SetSocket(std::move(fuzzed_socket));
 
   // Create auth handler supporting basic and digest schemes.  Other schemes can
   // make system calls, which doesn't seem like a great idea.
   net::HttpAuthCache auth_cache;
   net::HttpAuthHandlerRegistryFactory auth_handler_factory;
   auth_handler_factory.RegisterSchemeFactory(
       net::kBasicAuthScheme, new net::HttpAuthHandlerBasic::Factory());
   auth_handler_factory.RegisterSchemeFactory(
       net::kDigestAuthScheme, new net::HttpAuthHandlerDigest::Factory());
 
   scoped_refptr<net::HttpAuthController> auth_controller(
       new net::HttpAuthController(net::HttpAuth::AUTH_PROXY,
                                   GURL("http://proxy:42/"), &auth_cache,
                                   &auth_handler_factory));
+  // Determine if the HttpProxyClientSocket should be told the underlying socket
+  // is HTTPS.
+  bool is_https_proxy = data_provider.ConsumeBool();
   net::HttpProxyClientSocket socket(
       socket_handle.release(), "Bond/007", net::HostPortPair("foo", 80),
       net::HostPortPair("proxy", 42), auth_controller.get(), true /* tunnel */,
       false /* using_spdy */, net::kProtoUnknown, nullptr /* proxy_delegate */,
       is_https_proxy);
   int result = socket.Connect(callback.callback());
   result = callback.GetResult(result);
 
   // Repeatedly try to log in with the same credentials.
   while (result == net::ERR_PROXY_AUTH_REQUESTED) {
     auth_controller->ResetAuth(net::AuthCredentials(
         base::ASCIIToUTF16("user"), base::ASCIIToUTF16("pass")));
     result = socket.RestartWithAuth(callback.callback());
     result = callback.GetResult(result);
   }
 
   return 0;
 }