net: Add fuzzer for HostResolverImpl.

net/dns/dns_socket_pool.h

 // 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.
 
 #ifndef NET_DNS_DNS_SOCKET_POOL_H_
 #define NET_DNS_DNS_SOCKET_POOL_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "net/base/net_export.h"
+#include "net/base/rand_callback.h"
 #include "net/log/net_log.h"
 
 namespace net {
 
 class ClientSocketFactory;
 class DatagramClientSocket;
 class IPEndPoint;
 class NetLog;
 class StreamSocket;
 
 // A DnsSocketPool is an abstraction layer around a ClientSocketFactory that
 // allows preallocation, reuse, or other strategies to manage sockets connected
 // to DNS servers.
 class NET_EXPORT_PRIVATE DnsSocketPool {
  public:
   virtual ~DnsSocketPool() { }
 
   // Creates a DnsSocketPool that implements the default strategy for managing
   // sockets.  (This varies by platform; see DnsSocketPoolImpl in
   // dns_socket_pool.cc for details.)
   static std::unique_ptr<DnsSocketPool> CreateDefault(
-      ClientSocketFactory* factory);
+      ClientSocketFactory* factory,
+      const RandIntCallback& rand_int_callback);
 
   // Creates a DnsSocketPool that implements a "null" strategy -- no sockets are
   // preallocated, allocation requests are satisfied by calling the factory
   // directly, and returned sockets are deleted immediately.
   static std::unique_ptr<DnsSocketPool> CreateNull(
-      ClientSocketFactory* factory);
+      ClientSocketFactory* factory,
+      const RandIntCallback& rand_int_callback);
 
   // Initializes the DnsSocketPool.  |nameservers| is the list of nameservers
   // for which the DnsSocketPool will manage sockets; |net_log| is the NetLog
   // used when constructing sockets with the factory.
   //
   // Initialize may not be called more than once, and must be called before
   // calling AllocateSocket or FreeSocket.
   virtual void Initialize(
       const std::vector<IPEndPoint>* nameservers,
       NetLog* net_log) = 0;
 
   // Allocates a socket that is already connected to the nameserver referenced
   // by |server_index|.  May return a scoped_ptr to NULL if no sockets are
   // available to reuse and the factory fails to produce a socket (or produces
   // one on which Connect fails).
   virtual std::unique_ptr<DatagramClientSocket> AllocateSocket(
       unsigned server_index) = 0;
 
   // Frees a socket allocated by AllocateSocket.  |server_index| must be the
   // same index passed to AllocateSocket.
   virtual void FreeSocket(unsigned server_index,
                           std::unique_ptr<DatagramClientSocket> socket) = 0;
 
   // Creates a StreamSocket from the factory for a transaction over TCP. These
   // sockets are not pooled.
   std::unique_ptr<StreamSocket> CreateTCPSocket(unsigned server_index,
                                                 const NetLog::Source& source);
 
  protected:
-  DnsSocketPool(ClientSocketFactory* socket_factory);
+  DnsSocketPool(ClientSocketFactory* socket_factory,
+                const RandIntCallback& rand_int_callback);
 
   void InitializeInternal(
       const std::vector<IPEndPoint>* nameservers,
       NetLog* net_log);
 
   std::unique_ptr<DatagramClientSocket> CreateConnectedSocket(
       unsigned server_index);
 
+  const RandIntCallback& rand_int_callback() const {
+    return rand_int_callback_;
+  }
+
  private:
   ClientSocketFactory* socket_factory_;
+  const RandIntCallback& rand_int_callback_;
   NetLog* net_log_;
   const std::vector<IPEndPoint>* nameservers_;
   bool initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(DnsSocketPool);
 };
 
 } // namespace net
 
 #endif // NET_DNS_DNS_SOCKET_POOL_H_