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125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
// Copyright (c) 2014-2015, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <vector>
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#include <string>
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namespace tools
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{
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// RFC defines for record types and classes for DNS, gleaned from ldns source
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const static int DNS_CLASS_IN = 1;
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const static int DNS_TYPE_A = 1;
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const static int DNS_TYPE_TXT = 16;
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const static int DNS_TYPE_AAAA = 8;
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struct DNSResolverData;
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/**
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* @brief Provides high-level access to DNS resolution
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*
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* This class is designed to provide a high-level abstraction to DNS resolution
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* functionality, including access to TXT records and such. It will also
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* handle DNSSEC validation of the results.
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*/
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class DNSResolver
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{
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public:
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/**
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* @brief Constructs an instance of DNSResolver
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*
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* Constructs a class instance and does setup stuff for the backend resolver.
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*/
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DNSResolver();
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/**
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* @brief takes care of freeing C pointers and such
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*/
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~DNSResolver();
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/**
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* @brief gets ipv4 addresses from DNS query of a URL
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*
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* returns a vector of all IPv4 "A" records for given URL.
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* If no "A" records found, returns an empty vector.
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*
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* @param url A string containing a URL to query for
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*
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* @param dnssec_available
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*
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* @return vector of strings containing ipv4 addresses
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*/
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std::vector<std::string> get_ipv4(const std::string& url, bool& dnssec_available, bool& dnssec_valid);
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/**
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* @brief gets ipv6 addresses from DNS query
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*
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* returns a vector of all IPv6 "A" records for given URL.
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* If no "A" records found, returns an empty vector.
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*
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* @param url A string containing a URL to query for
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*
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* @return vector of strings containing ipv6 addresses
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*/
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std::vector<std::string> get_ipv6(const std::string& url, bool& dnssec_available, bool& dnssec_valid);
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/**
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* @brief gets all TXT records from a DNS query for the supplied URL;
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* if no TXT record present returns an empty vector.
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*
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* @param url A string containing a URL to query for
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*
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* @return A vector of strings containing a TXT record; or an empty vector
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*/
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// TODO: modify this to accomodate DNSSEC
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std::vector<std::string> get_txt_record(const std::string& url, bool& dnssec_available, bool& dnssec_valid);
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/**
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* @brief Gets the singleton instance of DNSResolver
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*
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* @return returns a pointer to the singleton
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*/
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static DNSResolver& instance();
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private:
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/**
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* @brief Checks a string to see if it looks like a URL
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*
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* @param addr the string to be checked
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*
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* @return true if it looks enough like a URL, false if not
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*/
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bool check_address_syntax(const std::string& addr);
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DNSResolverData *m_data;
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}; // class DNSResolver
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} // namespace tools
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