mirror of
https://codeberg.org/anoncontributorxmr/monero.git
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578050e91d
IPv4 and IPv6 name resolution working.
Unit tests written (and passing).
net_node.{h,inl} code modified to use DNS seeds.
136 lines
4 KiB
C++
136 lines
4 KiB
C++
// Copyright (c) 2014, 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 "common/dns_utils.h"
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#include <ldns/rr.h> // for RR type and class defs
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#include <unbound.h>
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#include <arpa/inet.h> // for inet_ntoa (bytes to text for IPs)
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namespace tools
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{
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struct DNSResolverData
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{
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ub_ctx* m_ub_context;
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};
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DNSResolver::DNSResolver() : m_data(new DNSResolverData())
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{
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// init libunbound context
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m_data->m_ub_context = ub_ctx_create();
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// look for "/etc/resolv.conf" and "/etc/hosts" or platform equivalent
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ub_ctx_resolvconf(m_data->m_ub_context, "");
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ub_ctx_hosts(m_data->m_ub_context, "");
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}
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DNSResolver::~DNSResolver()
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{
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if (m_data)
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{
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if (m_data->m_ub_context != NULL)
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{
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ub_ctx_delete(m_data->m_ub_context);
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}
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delete m_data;
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}
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}
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std::vector<std::string> DNSResolver::get_ipv4(const std::string& url)
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{
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ub_result* result = NULL;
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std::vector<std::string> retval;
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// call DNS resolver, blocking. if return value not zero, something went wrong
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if (!ub_resolve(m_data->m_ub_context, url.c_str(), LDNS_RR_TYPE_A, LDNS_RR_CLASS_IN, &result))
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{
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if (result->havedata)
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{
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for (int i=0; result->data[i] != NULL; i++)
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{
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char as_str[INET_ADDRSTRLEN];
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// convert bytes to string, append if no error
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if (inet_ntop(AF_INET, result->data[0], as_str, sizeof(as_str)))
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{
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retval.push_back(as_str);
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}
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}
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}
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}
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// cleanup
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ub_resolve_free(result);
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return retval;
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}
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std::vector<std::string> DNSResolver::get_ipv6(const std::string& url)
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{
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ub_result* result = NULL;
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std::vector<std::string> retval;
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// call DNS resolver, blocking. if return value not zero, something went wrong
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if (!ub_resolve(m_data->m_ub_context, url.c_str(), LDNS_RR_TYPE_AAAA, LDNS_RR_CLASS_IN, &result))
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{
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if (result->havedata)
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{
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for (int i=0; result->data[i] != NULL; i++)
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{
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char as_str[INET6_ADDRSTRLEN];
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// convert bytes to string, append if no error
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if (inet_ntop(AF_INET6, result->data[0], as_str, sizeof(as_str)))
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{
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retval.push_back(as_str);
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}
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}
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}
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}
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// cleanup
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ub_resolve_free(result);
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return retval;
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}
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std::string DNSResolver::get_payment_address(const std::string& url)
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{
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std::string retval;
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return retval;
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}
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DNSResolver& DNSResolver::instance()
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{
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static DNSResolver* staticInstance = NULL;
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if (staticInstance == NULL)
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{
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staticInstance = new DNSResolver();
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}
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return *staticInstance;
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}
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} // namespace tools
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