1 // Copyright 2015 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "net/tools/quic/synchronous_host_resolver.h"
6
7 #include <memory>
8 #include <optional>
9 #include <utility>
10
11 #include "base/at_exit.h"
12 #include "base/functional/bind.h"
13 #include "base/location.h"
14 #include "base/memory/weak_ptr.h"
15 #include "base/message_loop/message_pump_type.h"
16 #include "base/run_loop.h"
17 #include "base/task/single_thread_task_executor.h"
18 #include "base/task/single_thread_task_runner.h"
19 #include "base/threading/simple_thread.h"
20 #include "net/base/host_port_pair.h"
21 #include "net/base/net_errors.h"
22 #include "net/base/network_isolation_key.h"
23 #include "net/dns/host_resolver.h"
24 #include "net/log/net_log.h"
25 #include "net/log/net_log_with_source.h"
26 #include "url/scheme_host_port.h"
27
28 namespace net {
29
30
31 namespace {
32
33 class ResolverThread : public base::SimpleThread {
34 public:
35 ResolverThread();
36
37 ResolverThread(const ResolverThread&) = delete;
38 ResolverThread& operator=(const ResolverThread&) = delete;
39
40 ~ResolverThread() override;
41
42 // Called on the main thread.
43 int Resolve(url::SchemeHostPort scheme_host_port, AddressList* addresses);
44
45 // SimpleThread methods:
46 void Run() override;
47
48 private:
49 void OnResolutionComplete(base::OnceClosure on_done, int rv);
50
51 AddressList* addresses_;
52 url::SchemeHostPort scheme_host_port_;
53 int rv_ = ERR_UNEXPECTED;
54 };
55
ResolverThread()56 ResolverThread::ResolverThread() : SimpleThread("resolver_thread") {}
57
58 ResolverThread::~ResolverThread() = default;
59
Run()60 void ResolverThread::Run() {
61 base::SingleThreadTaskExecutor io_task_executor(base::MessagePumpType::IO);
62
63 net::HostResolver::ManagerOptions options;
64 options.max_concurrent_resolves = 6;
65 options.max_system_retry_attempts = 3u;
66 std::unique_ptr<net::HostResolver> resolver =
67 net::HostResolver::CreateStandaloneResolver(NetLog::Get(), options);
68
69 // No need to use a NetworkAnonymizationKey here, since this is an external
70 // tool not used by net/ consumers.
71 std::unique_ptr<net::HostResolver::ResolveHostRequest> request =
72 resolver->CreateRequest(scheme_host_port_, NetworkAnonymizationKey(),
73 NetLogWithSource(), std::nullopt);
74
75 base::RunLoop run_loop;
76 rv_ = request->Start(base::BindOnce(&ResolverThread::OnResolutionComplete,
77 base::Unretained(this),
78 run_loop.QuitClosure()));
79
80 if (rv_ == ERR_IO_PENDING) {
81 // Run the message loop until OnResolutionComplete quits it.
82 run_loop.Run();
83 }
84
85 if (rv_ == OK) {
86 *addresses_ = *request->GetAddressResults();
87 }
88 }
89
Resolve(url::SchemeHostPort scheme_host_port,AddressList * addresses)90 int ResolverThread::Resolve(url::SchemeHostPort scheme_host_port,
91 AddressList* addresses) {
92 scheme_host_port_ = std::move(scheme_host_port);
93 addresses_ = addresses;
94 this->Start();
95 this->Join();
96 return rv_;
97 }
98
OnResolutionComplete(base::OnceClosure on_done,int rv)99 void ResolverThread::OnResolutionComplete(base::OnceClosure on_done, int rv) {
100 rv_ = rv;
101 std::move(on_done).Run();
102 }
103
104 } // namespace
105
106 // static
Resolve(url::SchemeHostPort scheme_host_port,AddressList * addresses)107 int SynchronousHostResolver::Resolve(url::SchemeHostPort scheme_host_port,
108 AddressList* addresses) {
109 ResolverThread resolver;
110 return resolver.Resolve(std::move(scheme_host_port), addresses);
111 }
112
113 } // namespace net
114