Utility to resolve an hostname using Chromium's code in net/dns

net/base/host_resolver.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_BASE_HOST_RESOLVER_H_
 #define NET_BASE_HOST_RESOLVER_H_
 #pragma once
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "net/base/address_family.h"
 #include "net/base/completion_callback.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_export.h"
 #include "net/base/net_util.h"
 #include "net/base/request_priority.h"
 
 namespace base {
 class Value;
 }
 
 namespace net {
 
 class AddressList;
 class BoundNetLog;
 class HostCache;
 class HostResolverProc;
 class NetLog;
+class DnsConfigService;
 
 // This class represents the task of resolving hostnames (or IP address
 // literal) to an AddressList object.
 //
 // HostResolver can handle multiple requests at a time, so when cancelling a
 // request the RequestHandle that was returned by Resolve() needs to be
 // given.  A simpler alternative for consumers that only have 1 outstanding
 // request at a time is to create a SingleRequestHostResolver wrapper around
 // HostResolver (which will automatically cancel the single request when it
 // goes out of scope).
@@ skipping 157 matching lines @@
     size_t max_retry_attempts,
     NetLog* net_log);
 
 // As above, but the HostResolver will use the asynchronous DNS client in
 // DnsTransaction, which will be configured using DnsConfigService to match
 // the system DNS settings. If the client fails, the resolver falls back to
 // the global HostResolverProc.
 NET_EXPORT HostResolver* CreateAsyncHostResolver(size_t max_concurrent_resolves,
                                                  size_t max_retry_attempts,
                                                  NetLog* net_log);
+
+NET_EXPORT HostResolver* CreateHostResolver(

[szym, 2012/05/14 18:48:32]

I think you should just |#include "net/base/host_resolver_impl.h"| and construct
the HostResolverImpl yourself. I think of gdig as the same as test code, and I'd
like to avoid exposing CreateHostResolver in host_resolver.h

[Daniele, 2012/05/17 23:04:34]

Done.

+    size_t max_concurrent_resolves,
+    size_t max_retry_attempts,
+    HostCache* cache,
+    scoped_ptr<DnsConfigService> config_service,
+    NetLog* net_log);
+
 }  // namespace net
 
 #endif  // NET_BASE_HOST_RESOLVER_H_