text: // Copyright (c) 2019, The Monero Project
  //
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without modification, are
  // permitted provided that the following conditions are met:
  //
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  //
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  //
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include <string>
  #include <vector>
  #include <map>
  #include <algorithm>
  #include <boost/program_options.hpp>
  #include "epee/misc_log_ex.h"
  #include "common/util.h"
  #include "common/command_line.h"
  #include "common/dns_utils.h"
  #include "version.h"
  
  #undef QUENERO_DEFAULT_LOG_CATEGORY
  #define QUENERO_DEFAULT_LOG_CATEGORY "debugtools.dnschecks"
  
  namespace po = boost::program_options;
  
  enum lookup_t { LOOKUP_A, LOOKUP_TXT };
  
  static std::vector<std::string> lookup(lookup_t type, const char *hostname)
  {
    bool dnssec_available = false, dnssec_valid = false;
    std::vector<std::string> res;
    switch (type)
    {
      case LOOKUP_A: res = tools::DNSResolver::instance().get_ipv4(hostname, dnssec_available, dnssec_valid); break;
      case LOOKUP_TXT: res = tools::DNSResolver::instance().get_txt_record(hostname, dnssec_available, dnssec_valid); break;
      default: MERROR("Invalid lookup type: " << (int)type); return {};
    }
    if (!dnssec_available)
    {
      MWARNING("No DNSSEC for " << hostname);
      return {};
    }
    if (!dnssec_valid)
    {
      MWARNING("Invalid DNSSEC check for " << hostname);
      return {};
    }
    MINFO(res.size() << " valid signed result(s) for " << hostname);
    return res;
  }
  
  static void lookup(lookup_t type, const std::vector<std::string> hostnames)
  {
    std::vector<std::vector<std::string>> results;
    for (const std::string &hostname: hostnames)
    {
      auto res = lookup(type, hostname.c_str());
      if (!res.empty())
      {
        std::sort(res.begin(), res.end());
        results.push_back(res);
      }
    }
    std::map<std::vector<std::string>, size_t> counter;
    for (const auto &e: results)
      counter[e]++;
    size_t count = 0;
    for (const auto &e: counter)
      count = std::max(count, e.second);
    if (results.size() > 1)
    {
      if (count < results.size())
        MERROR("Only " << count << "/" << results.size() << " records match");
      else
        MINFO(count << "/" << results.size() << " records match");
    }
  }
  
  int main(int argc, char* argv[])
  {
    TRY_ENTRY();
  
    tools::on_startup();
  
    po::options_description desc_cmd_only("Command line options");
    po::options_description desc_cmd_sett("Command line options and settings options");
  
    command_line::add_arg(desc_cmd_only, command_line::arg_help);
  
    po::options_description desc_options("Allowed options");
    desc_options.add(desc_cmd_only).add(desc_cmd_sett);
  
    po::variables_map vm;
    bool r = command_line::handle_error_helper(desc_options, [&]()
    {
      po::store(po::parse_command_line(argc, argv, desc_options), vm);
      po::notify(vm);
      return true;
    });
    if (! r)
      return 1;
  
    if (command_line::get_arg(vm, command_line::arg_help))
    {
      std::cout << "Quenero '" << QUENERO_RELEASE_NAME << "' (v" << QUENERO_VERSION_FULL << ")\n\n";
      std::cout << desc_options << std::endl;
      return 1;
    }
  
    mlog_configure("", true);
    mlog_set_categories("+" QUENERO_DEFAULT_LOG_CATEGORY ":INFO");
  
    lookup(LOOKUP_A, {"seeds.moneroseeds.se", "seeds.moneroseeds.ae.org", "seeds.moneroseeds.ch", "seeds.moneroseeds.li"});
  
    lookup(LOOKUP_TXT, {"updates.moneropulse.org", "updates.moneropulse.net", "updates.moneropulse.co", "updates.moneropulse.se"});
  
    lookup(LOOKUP_TXT, {"checkpoints.moneropulse.org", "checkpoints.moneropulse.net", "checkpoints.moneropulse.co", "checkpoints.moneropulse.se"});
  
    // those are in the code, but don't seem to actually exist
  #if 0
    lookup(LOOKUP_TXT, {"testpoints.moneropulse.org", "testpoints.moneropulse.net", "testpoints.moneropulse.co", "testpoints.moneropulse.se");
  
    lookup(LOOKUP_TXT, {"stagenetpoints.moneropulse.org", "stagenetpoints.moneropulse.net", "stagenetpoints.moneropulse.co", "stagenetpoints.moneropulse.se"});
  #endif
  
    lookup(LOOKUP_TXT, {"segheights.moneropulse.org", "segheights.moneropulse.net", "segheights.moneropulse.co", "segheights.moneropulse.se"});
  
    return 0;
    CATCH_ENTRY_L0("main", 1);
  }
  