mirror of https://github.com/ARMmbed/mbed-os.git
98 lines
4.2 KiB
C++
98 lines
4.2 KiB
C++
/*
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* Copyright (c) 2018 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef DNS_H
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#define DNS_H
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class DNS {
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public:
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/** Translates a hostname to an IP address with specific version
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*
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* The hostname may be either a domain name or an IP address. If the
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* hostname is an IP address, no network transactions will be performed.
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*
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* If no stack-specific DNS resolution is provided, the hostname
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* will be resolve using a UDP socket on the stack.
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*
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* @param host Hostname to resolve
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* @param address Destination for the host SocketAddress
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* @param version IP version of address to resolve, NSAPI_UNSPEC indicates
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* version is chosen by the stack (defaults to NSAPI_UNSPEC)
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* @return 0 on success, negative error code on failure
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*/
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virtual nsapi_error_t gethostbyname(const char *host,
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SocketAddress *address, nsapi_version_t version = NSAPI_UNSPEC) = 0;
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/** Hostname translation callback (asynchronous)
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*
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* Callback will be called after DNS resolution completes or a failure occurs.
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*
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* Callback should not take more than 10ms to execute, otherwise it might
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* prevent underlying thread processing. A portable user of the callback
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* should not make calls to network operations due to stack size limitations.
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* The callback should not perform expensive operations such as socket recv/send
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* calls or blocking operations.
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*
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* @param status 0 on success, negative error code on failure
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* @param address On success, destination for the host SocketAddress
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*/
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typedef mbed::Callback<void (nsapi_error_t result, SocketAddress *address)> hostbyname_cb_t;
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/** Translates a hostname to an IP address (asynchronous)
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*
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* The hostname may be either a domain name or an IP address. If the
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* hostname is an IP address, no network transactions will be performed.
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*
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* If no stack-specific DNS resolution is provided, the hostname
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* will be resolve using a UDP socket on the stack.
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*
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* Call is non-blocking. Result of the DNS operation is returned by the callback.
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* If this function returns failure, callback will not be called. In case result
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* is success (IP address was found from DNS cache), callback will be called
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* before function returns.
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*
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* @param host Hostname to resolve
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* @param callback Callback that is called for result
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* @param version IP version of address to resolve, NSAPI_UNSPEC indicates
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* version is chosen by the stack (defaults to NSAPI_UNSPEC)
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* @return 0 on immediate success,
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* negative error code on immediate failure or
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* a positive unique id that represents the hostname translation operation
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* and can be passed to cancel
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*/
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virtual nsapi_value_or_error_t gethostbyname_async(const char *host, hostbyname_cb_t callback,
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nsapi_version_t version = NSAPI_UNSPEC) = 0;
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/** Cancels asynchronous hostname translation
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*
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* When translation is cancelled, callback will not be called.
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*
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* @param id Unique id of the hostname translation operation
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* @return 0 on success, negative error code on failure
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*/
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virtual nsapi_error_t gethostbyname_async_cancel(int id) = 0;
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/** Add a domain name server to list of servers to query
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*
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* @param address Destination for the host address
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* @return 0 on success, negative error code on failure
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*/
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virtual nsapi_error_t add_dns_server(const SocketAddress &address) = 0;
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};
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#endif
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