1//
2// detail/resolver_service.hpp
3// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
4//
5// Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
6//
7// Distributed under the Boost Software License, Version 1.0. (See accompanying
8// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9//
10
11#ifndef BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
12#define BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
13
14#if defined(_MSC_VER) && (_MSC_VER >= 1200)
15# pragma once
16#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
17
18#include <boost/asio/detail/config.hpp>
19
20#if !defined(BOOST_ASIO_WINDOWS_RUNTIME)
21
22#include <boost/asio/ip/basic_resolver_iterator.hpp>
23#include <boost/asio/ip/basic_resolver_query.hpp>
24#include <boost/asio/detail/addressof.hpp>
25#include <boost/asio/detail/resolve_endpoint_op.hpp>
26#include <boost/asio/detail/resolve_op.hpp>
27#include <boost/asio/detail/resolver_service_base.hpp>
28
29#include <boost/asio/detail/push_options.hpp>
30
31namespace boost {
32namespace asio {
33namespace detail {
34
35template <typename Protocol>
36class resolver_service : public resolver_service_base
37{
38public:
39 // The implementation type of the resolver. A cancellation token is used to
40 // indicate to the background thread that the operation has been cancelled.
41 typedef socket_ops::shared_cancel_token_type implementation_type;
42
43 // The endpoint type.
44 typedef typename Protocol::endpoint endpoint_type;
45
46 // The query type.
47 typedef boost::asio::ip::basic_resolver_query<Protocol> query_type;
48
49 // The iterator type.
50 typedef boost::asio::ip::basic_resolver_iterator<Protocol> iterator_type;
51
52 // Constructor.
53 resolver_service(boost::asio::io_service& io_service)
54 : resolver_service_base(io_service)
55 {
56 }
57
58 // Resolve a query to a list of entries.
59 iterator_type resolve(implementation_type&, const query_type& query,
60 boost::system::error_code& ec)
61 {
62 boost::asio::detail::addrinfo_type* address_info = 0;
63
64 socket_ops::getaddrinfo(query.host_name().c_str(),
65 query.service_name().c_str(), query.hints(), &address_info, ec);
66 auto_addrinfo auto_address_info(address_info);
67
68 return ec ? iterator_type() : iterator_type::create(
69 address_info, query.host_name(), query.service_name());
70 }
71
72 // Asynchronously resolve a query to a list of entries.
73 template <typename Handler>
74 void async_resolve(implementation_type& impl,
75 const query_type& query, Handler& handler)
76 {
77 // Allocate and construct an operation to wrap the handler.
78 typedef resolve_op<Protocol, Handler> op;
79 typename op::ptr p = { boost::asio::detail::addressof(handler),
80 boost_asio_handler_alloc_helpers::allocate(
81 sizeof(op), handler), 0 };
82 p.p = new (p.v) op(impl, query, io_service_impl_, handler);
83
84 BOOST_ASIO_HANDLER_CREATION((p.p, "resolver", &impl, "async_resolve"));
85
86 start_resolve_op(p.p);
87 p.v = p.p = 0;
88 }
89
90 // Resolve an endpoint to a list of entries.
91 iterator_type resolve(implementation_type&,
92 const endpoint_type& endpoint, boost::system::error_code& ec)
93 {
94 char host_name[NI_MAXHOST];
95 char service_name[NI_MAXSERV];
96 socket_ops::sync_getnameinfo(endpoint.data(), endpoint.size(),
97 host_name, NI_MAXHOST, service_name, NI_MAXSERV,
98 endpoint.protocol().type(), ec);
99
100 return ec ? iterator_type() : iterator_type::create(
101 endpoint, host_name, service_name);
102 }
103
104 // Asynchronously resolve an endpoint to a list of entries.
105 template <typename Handler>
106 void async_resolve(implementation_type& impl,
107 const endpoint_type& endpoint, Handler& handler)
108 {
109 // Allocate and construct an operation to wrap the handler.
110 typedef resolve_endpoint_op<Protocol, Handler> op;
111 typename op::ptr p = { boost::asio::detail::addressof(handler),
112 boost_asio_handler_alloc_helpers::allocate(
113 sizeof(op), handler), 0 };
114 p.p = new (p.v) op(impl, endpoint, io_service_impl_, handler);
115
116 BOOST_ASIO_HANDLER_CREATION((p.p, "resolver", &impl, "async_resolve"));
117
118 start_resolve_op(p.p);
119 p.v = p.p = 0;
120 }
121};
122
123} // namespace detail
124} // namespace asio
125} // namespace boost
126
127#include <boost/asio/detail/pop_options.hpp>
128
129#endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME)
130
131#endif // BOOST_ASIO_DETAIL_RESOLVER_SERVICE_HPP
132