1 // 2 // ip/basic_resolver_query.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 ASIO_IP_BASIC_RESOLVER_QUERY_HPP 12 #define ASIO_IP_BASIC_RESOLVER_QUERY_HPP 13 14 15 #include "asio/detail/config.hpp" 16 #include <string> 17 #include "asio/detail/socket_ops.hpp" 18 #include "asio/ip/resolver_query_base.hpp" 19 20 #include "asio/detail/push_options.hpp" 21 22 namespace asio { 23 namespace ip { 24 25 /// An query to be passed to a resolver. 26 /** 27 * The asio::ip::basic_resolver_query class template describes a query 28 * that can be passed to a resolver. 29 * 30 * @par Thread Safety 31 * @e Distinct @e objects: Safe.@n 32 * @e Shared @e objects: Unsafe. 33 */ 34 template <typename InternetProtocol> 35 class basic_resolver_query 36 : public resolver_query_base 37 { 38 public: 39 /// The protocol type associated with the endpoint query. 40 typedef InternetProtocol protocol_type; 41 42 /// Construct with specified service name for any protocol. 43 /** 44 * This constructor is typically used to perform name resolution for local 45 * service binding. 46 * 47 * @param service A string identifying the requested service. This may be a 48 * descriptive name or a numeric string corresponding to a port number. 49 * 50 * @param resolve_flags A set of flags that determine how name resolution 51 * should be performed. The default flags are suitable for local service 52 * binding. 53 * 54 * @note On POSIX systems, service names are typically defined in the file 55 * <tt>/etc/services</tt>. On Windows, service names may be found in the file 56 * <tt>c:\\windows\\system32\\drivers\\etc\\services</tt>. Operating systems 57 * may use additional locations when resolving service names. 58 */ 59 basic_resolver_query(const std::string& service, 60 resolver_query_base::flags resolve_flags = passive | address_configured) 61 : hints_(), 62 host_name_(), 63 service_name_(service) 64 { 65 typename InternetProtocol::endpoint endpoint; 66 hints_.ai_flags = static_cast<int>(resolve_flags); 67 hints_.ai_family = PF_UNSPEC; 68 hints_.ai_socktype = endpoint.protocol().type(); 69 hints_.ai_protocol = endpoint.protocol().protocol(); 70 hints_.ai_addrlen = 0; 71 hints_.ai_canonname = 0; 72 hints_.ai_addr = 0; 73 hints_.ai_next = 0; 74 } 75 76 /// Construct with specified service name for a given protocol. 77 /** 78 * This constructor is typically used to perform name resolution for local 79 * service binding with a specific protocol version. 80 * 81 * @param protocol A protocol object, normally representing either the IPv4 or 82 * IPv6 version of an internet protocol. 83 * 84 * @param service A string identifying the requested service. This may be a 85 * descriptive name or a numeric string corresponding to a port number. 86 * 87 * @param resolve_flags A set of flags that determine how name resolution 88 * should be performed. The default flags are suitable for local service 89 * binding. 90 * 91 * @note On POSIX systems, service names are typically defined in the file 92 * <tt>/etc/services</tt>. On Windows, service names may be found in the file 93 * <tt>c:\\windows\\system32\\drivers\\etc\\services</tt>. Operating systems 94 * may use additional locations when resolving service names. 95 */ 96 basic_resolver_query(const protocol_type& protocol, 97 const std::string& service, 98 resolver_query_base::flags resolve_flags = passive | address_configured) 99 : hints_(), 100 host_name_(), 101 service_name_(service) 102 { 103 hints_.ai_flags = static_cast<int>(resolve_flags); 104 hints_.ai_family = protocol.family(); 105 hints_.ai_socktype = protocol.type(); 106 hints_.ai_protocol = protocol.protocol(); 107 hints_.ai_addrlen = 0; 108 hints_.ai_canonname = 0; 109 hints_.ai_addr = 0; 110 hints_.ai_next = 0; 111 } 112 113 /// Construct with specified host name and service name for any protocol. 114 /** 115 * This constructor is typically used to perform name resolution for 116 * communication with remote hosts. 117 * 118 * @param host A string identifying a location. May be a descriptive name or 119 * a numeric address string. If an empty string and the passive flag has been 120 * specified, the resolved endpoints are suitable for local service binding. 121 * If an empty string and passive is not specified, the resolved endpoints 122 * will use the loopback address. 123 * 124 * @param service A string identifying the requested service. This may be a 125 * descriptive name or a numeric string corresponding to a port number. May 126 * be an empty string, in which case all resolved endpoints will have a port 127 * number of 0. 128 * 129 * @param resolve_flags A set of flags that determine how name resolution 130 * should be performed. The default flags are suitable for communication with 131 * remote hosts. 132 * 133 * @note On POSIX systems, host names may be locally defined in the file 134 * <tt>/etc/hosts</tt>. On Windows, host names may be defined in the file 135 * <tt>c:\\windows\\system32\\drivers\\etc\\hosts</tt>. Remote host name 136 * resolution is performed using DNS. Operating systems may use additional 137 * locations when resolving host names (such as NETBIOS names on Windows). 138 * 139 * On POSIX systems, service names are typically defined in the file 140 * <tt>/etc/services</tt>. On Windows, service names may be found in the file 141 * <tt>c:\\windows\\system32\\drivers\\etc\\services</tt>. Operating systems 142 * may use additional locations when resolving service names. 143 */ 144 basic_resolver_query(const std::string& host, const std::string& service, 145 resolver_query_base::flags resolve_flags = address_configured) 146 : hints_(), 147 host_name_(host), 148 service_name_(service) 149 { 150 typename InternetProtocol::endpoint endpoint; 151 hints_.ai_flags = static_cast<int>(resolve_flags); 152 hints_.ai_family = ASIO_OS_DEF(AF_UNSPEC); 153 hints_.ai_socktype = endpoint.protocol().type(); 154 hints_.ai_protocol = endpoint.protocol().protocol(); 155 hints_.ai_addrlen = 0; 156 hints_.ai_canonname = 0; 157 hints_.ai_addr = 0; 158 hints_.ai_next = 0; 159 } 160 161 /// Construct with specified host name and service name for a given protocol. 162 /** 163 * This constructor is typically used to perform name resolution for 164 * communication with remote hosts. 165 * 166 * @param protocol A protocol object, normally representing either the IPv4 or 167 * IPv6 version of an internet protocol. 168 * 169 * @param host A string identifying a location. May be a descriptive name or 170 * a numeric address string. If an empty string and the passive flag has been 171 * specified, the resolved endpoints are suitable for local service binding. 172 * If an empty string and passive is not specified, the resolved endpoints 173 * will use the loopback address. 174 * 175 * @param service A string identifying the requested service. This may be a 176 * descriptive name or a numeric string corresponding to a port number. May 177 * be an empty string, in which case all resolved endpoints will have a port 178 * number of 0. 179 * 180 * @param resolve_flags A set of flags that determine how name resolution 181 * should be performed. The default flags are suitable for communication with 182 * remote hosts. 183 * 184 * @note On POSIX systems, host names may be locally defined in the file 185 * <tt>/etc/hosts</tt>. On Windows, host names may be defined in the file 186 * <tt>c:\\windows\\system32\\drivers\\etc\\hosts</tt>. Remote host name 187 * resolution is performed using DNS. Operating systems may use additional 188 * locations when resolving host names (such as NETBIOS names on Windows). 189 * 190 * On POSIX systems, service names are typically defined in the file 191 * <tt>/etc/services</tt>. On Windows, service names may be found in the file 192 * <tt>c:\\windows\\system32\\drivers\\etc\\services</tt>. Operating systems 193 * may use additional locations when resolving service names. 194 */ 195 basic_resolver_query(const protocol_type& protocol, 196 const std::string& host, const std::string& service, 197 resolver_query_base::flags resolve_flags = address_configured) 198 : hints_(), 199 host_name_(host), 200 service_name_(service) 201 { 202 hints_.ai_flags = static_cast<int>(resolve_flags); 203 hints_.ai_family = protocol.family(); 204 hints_.ai_socktype = protocol.type(); 205 hints_.ai_protocol = protocol.protocol(); 206 hints_.ai_addrlen = 0; 207 hints_.ai_canonname = 0; 208 hints_.ai_addr = 0; 209 hints_.ai_next = 0; 210 } 211 212 /// Get the hints associated with the query. 213 const asio::detail::addrinfo_type& hints() const 214 { 215 return hints_; 216 } 217 218 /// Get the host name associated with the query. 219 std::string host_name() const 220 { 221 return host_name_; 222 } 223 224 /// Get the service name associated with the query. 225 std::string service_name() const 226 { 227 return service_name_; 228 } 229 230 private: 231 asio::detail::addrinfo_type hints_; 232 std::string host_name_; 233 std::string service_name_; 234 }; 235 236 } // namespace ip 237 } // namespace asio 238 239 #include "asio/detail/pop_options.hpp" 240 241 #endif // ASIO_IP_BASIC_RESOLVER_QUERY_HPP 242
