1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
// Copyright (c) 2006-2008 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_
#include <string>
#include "base/basictypes.h"
#include "base/ref_counted.h"
#include "net/base/completion_callback.h"
namespace net {
class AddressList;
// This class represents the task of resolving a hostname (or IP address
// literal) to an AddressList object. It can only resolve a single hostname at
// a time, so if you need to resolve multiple hostnames at the same time, you
// will need to allocate a HostResolver object for each hostname.
//
// No attempt is made at this level to cache or pin resolution results. For
// each request, this API talks directly to the underlying name resolver of
// the local system, which may or may not result in a DNS query. The exact
// behavior depends on the system configuration.
//
class HostResolver {
public:
HostResolver();
// If a completion callback is pending when the resolver is destroyed, the
// host resolution is cancelled, and the completion callback will not be
// called.
~HostResolver();
// Resolves the given hostname (or IP address literal), filling out the
// |addresses| object upon success. The |port| parameter will be set as the
// sin(6)_port field of the sockaddr_in{6} struct. Returns OK if successful
// or an error code upon failure.
//
// When callback is null, the operation completes synchronously.
//
// When callback is non-null, ERR_IO_PENDING is returned if the operation
// could not be completed synchronously, in which case the result code will
// be passed to the callback when available.
//
int Resolve(const std::string& hostname, int port,
AddressList* addresses, CompletionCallback* callback);
private:
class Request;
friend class Request;
scoped_refptr<Request> request_;
DISALLOW_EVIL_CONSTRUCTORS(HostResolver);
};
} // namespace net
#endif // NET_BASE_HOST_RESOLVER_H_
|
