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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
//
// detail/resolver_service.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef ASIO_DETAIL_RESOLVER_SERVICE_HPP
#define ASIO_DETAIL_RESOLVER_SERVICE_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if !defined(ASIO_WINDOWS_RUNTIME)
#include "asio/ip/basic_resolver_query.hpp"
#include "asio/ip/basic_resolver_results.hpp"
#include "asio/detail/concurrency_hint.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/resolve_endpoint_op.hpp"
#include "asio/detail/resolve_query_op.hpp"
#include "asio/detail/resolver_service_base.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename Protocol>
class resolver_service :
public service_base<resolver_service<Protocol> >,
public resolver_service_base
{
public:
// The implementation type of the resolver. A cancellation token is used to
// indicate to the background thread that the operation has been cancelled.
typedef socket_ops::shared_cancel_token_type implementation_type;
// The endpoint type.
typedef typename Protocol::endpoint endpoint_type;
// The query type.
typedef asio::ip::basic_resolver_query<Protocol> query_type;
// The results type.
typedef asio::ip::basic_resolver_results<Protocol> results_type;
// Constructor.
resolver_service(asio::io_context& io_context)
: service_base<resolver_service<Protocol> >(io_context),
resolver_service_base(io_context)
{
}
// Destroy all user-defined handler objects owned by the service.
void shutdown()
{
this->base_shutdown();
}
// Perform any fork-related housekeeping.
void notify_fork(asio::io_context::fork_event fork_ev)
{
this->base_notify_fork(fork_ev);
}
// Resolve a query to a list of entries.
results_type resolve(implementation_type&, const query_type& query,
asio::error_code& ec)
{
asio::detail::addrinfo_type* address_info = 0;
socket_ops::getaddrinfo(query.host_name().c_str(),
query.service_name().c_str(), query.hints(), &address_info, ec);
auto_addrinfo auto_address_info(address_info);
return ec ? results_type() : results_type::create(
address_info, query.host_name(), query.service_name());
}
// Asynchronously resolve a query to a list of entries.
template <typename Handler>
void async_resolve(implementation_type& impl,
const query_type& query, Handler& handler)
{
// Allocate and construct an operation to wrap the handler.
typedef resolve_query_op<Protocol, Handler> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
p.p = new (p.v) op(impl, query, io_context_impl_, handler);
ASIO_HANDLER_CREATION((io_context_impl_.context(),
*p.p, "resolver", &impl, 0, "async_resolve"));
start_resolve_op(p.p);
p.v = p.p = 0;
}
// Resolve an endpoint to a list of entries.
results_type resolve(implementation_type&,
const endpoint_type& endpoint, asio::error_code& ec)
{
char host_name[NI_MAXHOST];
char service_name[NI_MAXSERV];
socket_ops::sync_getnameinfo(endpoint.data(), endpoint.size(),
host_name, NI_MAXHOST, service_name, NI_MAXSERV,
endpoint.protocol().type(), ec);
return ec ? results_type() : results_type::create(
endpoint, host_name, service_name);
}
// Asynchronously resolve an endpoint to a list of entries.
template <typename Handler>
void async_resolve(implementation_type& impl,
const endpoint_type& endpoint, Handler& handler)
{
// Allocate and construct an operation to wrap the handler.
typedef resolve_endpoint_op<Protocol, Handler> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
p.p = new (p.v) op(impl, endpoint, io_context_impl_, handler);
ASIO_HANDLER_CREATION((io_context_impl_.context(),
*p.p, "resolver", &impl, 0, "async_resolve"));
start_resolve_op(p.p);
p.v = p.p = 0;
}
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // !defined(ASIO_WINDOWS_RUNTIME)
#endif // ASIO_DETAIL_RESOLVER_SERVICE_HPP
|
