blob: 66978f7f3fdc43997fd2d143d7f2047ef886054e (
plain)
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
62
63
64
65
66
67
68
69
|
// Copyright (c) 2009 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_PROC_H_
#define NET_BASE_HOST_RESOLVER_PROC_H_
#include <string>
#include "base/ref_counted.h"
namespace net {
class AddressList;
// Interface for a getaddrinfo()-like procedure. This is used by unit-tests
// to control the underlying resolutions in HostResolverImpl. HostResolverProcs
// can be chained together; they fallback to the next procedure in the chain
// by calling ResolveUsingPrevious().
//
// Note that implementations of HostResolverProc *MUST BE THREADSAFE*, since
// the HostResolver implementation using them can be multi-threaded.
class HostResolverProc : public base::RefCountedThreadSafe<HostResolverProc> {
public:
explicit HostResolverProc(HostResolverProc* previous);
virtual ~HostResolverProc() {}
// Resolves |host| to an address list. If successful returns OK and fills
// |addrlist| with a list of socket addresses. Otherwise returns a
// network error code.
virtual int Resolve(const std::string& host, AddressList* addrlist) = 0;
protected:
// Asks the fallback procedure (if set) to do the resolve.
int ResolveUsingPrevious(const std::string& host, AddressList* addrlist);
private:
friend class HostResolverImpl;
friend class MockHostResolverBase;
friend class ScopedDefaultHostResolverProc;
// Sets the previous procedure in the chain.
void set_previous_proc(HostResolverProc* proc) {
previous_proc_ = proc;
}
// Sets the default host resolver procedure that is used by HostResolverImpl.
// This can be used through ScopedDefaultHostResolverProc to set a catch-all
// DNS block in unit-tests (individual tests should use MockHostResolver to
// prevent hitting the network).
static HostResolverProc* SetDefault(HostResolverProc* proc);
static HostResolverProc* GetDefault();
private:
scoped_refptr<HostResolverProc> previous_proc_;
static HostResolverProc* default_proc_;
DISALLOW_COPY_AND_ASSIGN(HostResolverProc);
};
// Resolves |host| to an address list, using the system's default host resolver.
// (i.e. this calls out to getaddrinfo()). If successful returns OK and fills
// |addrlist| with a list of socket addresses. Otherwise returns a
// network error code.
int SystemHostResolverProc(const std::string& host, AddressList* addrlist);
} // namespace net
#endif // NET_BASE_HOST_RESOLVER_PROC_H_
|
