net: perform a non-A DNS lookup for HTTPS hosts.

net/socket/ssl_host_info.h

 // Copyright (c) 2010 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_SOCKET_SSL_HOST_INFO_H_
 #define NET_SOCKET_SSL_HOST_INFO_H_
 
 #include <string>
 #include <vector>
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "net/base/cert_verifier.h"
 #include "net/base/cert_verify_result.h"
 #include "net/base/completion_callback.h"
+#include "net/base/dnsrr_resolver.h"
 #include "net/socket/ssl_client_socket.h"
 
 namespace net {
 
 class X509Certificate;
 struct SSLConfig;
 
 // SSLHostInfo is an interface for fetching information about an SSL server.
 // This information may be stored on disk so does not include keys or session
 // information etc. Primarily it's intended for caching the server's
@@ skipping 22 matching lines @@
   // but, obviously, a callback will never be made.
   virtual int WaitForDataReady(CompletionCallback* callback) = 0;
 
   // Persist allows for the host information to be updated for future users.
   // This is a fire and forget operation: the caller may drop its reference
   // from this object and the store operation will still complete. This can
   // only be called once WaitForDataReady has returned OK or called its
   // callback.
   virtual void Persist() = 0;
 
+  // StartDnsLookup triggers a DNS lookup for the host.
+  void StartDnsLookup(DnsRRResolver* dnsrr_resolver);
+
   struct State {
     State();
     ~State();
 
     void Clear();
 
     // certs is a vector of DER encoded X.509 certificates, as the server
     // returned them and in the same order.
     std::vector<std::string> certs;
     // server_hello contains the bytes of the ServerHello message (or may be
@@ skipping 43 matching lines @@
   bool cert_verification_complete_;
   int cert_verification_error_;
 
  private:
   // This is the callback function which the CertVerifier calls via |callback_|.
   void VerifyCallback(int rv);
 
   // ParseInner is a helper function for Parse.
   bool ParseInner(const std::string& data);
 
+  // DnsComplete is a callback function which is called when our DNS resolution
+  // completes.
+  void DnsComplete(int rv);
+
   // This is the hostname that we'll validate the certificates against.
   const std::string hostname_;
   bool cert_parsing_failed_;
   CompletionCallback* cert_verification_callback_;
   // These two members are taken from the SSLConfig.
   bool rev_checking_enabled_;
   bool verify_ev_cert_;
   base::TimeTicks verification_start_time_;
   base::TimeTicks verification_end_time_;
   CertVerifyResult cert_verify_result_;
   SingleRequestCertVerifier verifier_;
   scoped_refptr<X509Certificate> cert_;
   scoped_refptr<CancelableCompletionCallback<SSLHostInfo> > callback_;
+
+  DnsRRResolver* dnsrr_resolver_;
+  CompletionCallback* dns_callback_;
+  DnsRRResolver::Handle dns_handle_;
+  RRResponse dns_response_;
+  base::TimeTicks dns_lookup_start_time_;
 };
 
 class SSLHostInfoFactory {
  public:
   virtual ~SSLHostInfoFactory();
 
   // GetForHost returns a fresh, allocated SSLHostInfo for the given hostname
   // or NULL on failure.
   virtual SSLHostInfo* GetForHost(const std::string& hostname,
                                   const SSLConfig& ssl_config) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_SSL_HOST_INFO_H_