1 // 2 // detail/resolver_service.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2016 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 ASIO_DETAIL_RESOLVER_SERVICE_HPP 12 #define 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 "asio/detail/config.hpp" 19 20 #if !defined(ASIO_WINDOWS_RUNTIME) 21 22 #include "asio/ip/basic_resolver_iterator.hpp" 23 #include "asio/ip/basic_resolver_query.hpp" 24 #include "asio/detail/addressof.hpp" 25 #include "asio/detail/resolve_endpoint_op.hpp" 26 #include "asio/detail/resolve_op.hpp" 27 #include "asio/detail/resolver_service_base.hpp" 28 29 #include "asio/detail/push_options.hpp" 30 31 namespace asio { 32 namespace detail { 33 34 template <typename Protocol> 35 class resolver_service : public resolver_service_base 36 { 37 public: 38 // The implementation type of the resolver. A cancellation token is used to 39 // indicate to the background thread that the operation has been cancelled. 40 typedef socket_ops::shared_cancel_token_type implementation_type; 41 42 // The endpoint type. 43 typedef typename Protocol::endpoint endpoint_type; 44 45 // The query type. 46 typedef asio::ip::basic_resolver_query<Protocol> query_type; 47 48 // The iterator type. 49 typedef asio::ip::basic_resolver_iterator<Protocol> iterator_type; 50 51 // Constructor. resolver_service(asio::io_service & io_service)52 resolver_service(asio::io_service& io_service) 53 : resolver_service_base(io_service) 54 { 55 } 56 57 // Resolve a query to a list of entries. resolve(implementation_type &,const query_type & query,asio::error_code & ec)58 iterator_type resolve(implementation_type&, const query_type& query, 59 asio::error_code& ec) 60 { 61 asio::detail::addrinfo_type* address_info = 0; 62 63 socket_ops::getaddrinfo(query.host_name().c_str(), 64 query.service_name().c_str(), query.hints(), &address_info, ec); 65 auto_addrinfo auto_address_info(address_info); 66 67 return ec ? iterator_type() : iterator_type::create( 68 address_info, query.host_name(), query.service_name()); 69 } 70 71 // Asynchronously resolve a query to a list of entries. 72 template <typename Handler> async_resolve(implementation_type & impl,const query_type & query,Handler & handler)73 void async_resolve(implementation_type& impl, 74 const query_type& query, Handler& handler) 75 { 76 // Allocate and construct an operation to wrap the handler. 77 typedef resolve_op<Protocol, Handler> op; 78 typename op::ptr p = { asio::detail::addressof(handler), 79 asio_handler_alloc_helpers::allocate( 80 sizeof(op), handler), 0 }; 81 p.p = new (p.v) op(impl, query, io_service_impl_, handler); 82 83 ASIO_HANDLER_CREATION((p.p, "resolver", &impl, "async_resolve")); 84 85 start_resolve_op(p.p); 86 p.v = p.p = 0; 87 } 88 89 // Resolve an endpoint to a list of entries. resolve(implementation_type &,const endpoint_type & endpoint,asio::error_code & ec)90 iterator_type resolve(implementation_type&, 91 const endpoint_type& endpoint, asio::error_code& ec) 92 { 93 char host_name[NI_MAXHOST]; 94 char service_name[NI_MAXSERV]; 95 socket_ops::sync_getnameinfo(endpoint.data(), endpoint.size(), 96 host_name, NI_MAXHOST, service_name, NI_MAXSERV, 97 endpoint.protocol().type(), ec); 98 99 return ec ? iterator_type() : iterator_type::create( 100 endpoint, host_name, service_name); 101 } 102 103 // Asynchronously resolve an endpoint to a list of entries. 104 template <typename Handler> async_resolve(implementation_type & impl,const endpoint_type & endpoint,Handler & handler)105 void async_resolve(implementation_type& impl, 106 const endpoint_type& endpoint, Handler& handler) 107 { 108 // Allocate and construct an operation to wrap the handler. 109 typedef resolve_endpoint_op<Protocol, Handler> op; 110 typename op::ptr p = { asio::detail::addressof(handler), 111 asio_handler_alloc_helpers::allocate( 112 sizeof(op), handler), 0 }; 113 p.p = new (p.v) op(impl, endpoint, io_service_impl_, handler); 114 115 ASIO_HANDLER_CREATION((p.p, "resolver", &impl, "async_resolve")); 116 117 start_resolve_op(p.p); 118 p.v = p.p = 0; 119 } 120 }; 121 122 } // namespace detail 123 } // namespace asio 124 125 #include "asio/detail/pop_options.hpp" 126 127 #endif // !defined(ASIO_WINDOWS_RUNTIME) 128 129 #endif // ASIO_DETAIL_RESOLVER_SERVICE_HPP 130