updates.cpp

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// Copyright (c) 2017-Present, Electroneum
// Copyright (c) 2017-2019, 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 <boost/algorithm/string.hpp>
#include "misc_log_ex.h"
#include "util.h"
#include "dns_utils.h"
#include "updates.h"
 
#undef ELECTRONEUM_DEFAULT_LOG_CATEGORY
#define ELECTRONEUM_DEFAULT_LOG_CATEGORY "updates"
 
namespace tools
{
  bool check_updates(const std::string &software, const std::string &buildtag, std::string &version, std::string &hash)
  {
    std::vector<std::string> records;
    bool found = false;
 
    MDEBUG("Checking updates for " << buildtag << " " << software);
 
    // All four ElectroneumPulse domains have DNSSEC on and valid
    static const std::vector<std::string> dns_urls = {
      "updates.electroneumpulse.com",
      "updates.electroneumpulse.info",
      "updates.electroneumpulse.net",
      "updates.electroneumpulse.org"
    };
 
    if (!tools::dns_utils::load_txt_records_from_dns(records, dns_urls, "update"))
      return false;
 
    for (const auto& record : records)
    {
      std::vector<std::string> fields;
      boost::split(fields, record, boost::is_any_of(":"));
      if (fields.size() != 4)
      {
        MWARNING("Updates record does not have 4 fields: " << record);
        continue;
      }
 
      if (software != fields[0] || buildtag != fields[1])
        continue;
 
      bool alnum = true;
      for (auto c: fields[3])
        if (!isalnum(c))
          alnum = false;
      if (fields[3].size() != 64 && !alnum)
      {
        MWARNING("Invalid hash: " << fields[3]);
        continue;
      }
 
      // use highest version
      if (found)
      {
        int cmp = vercmp(version.c_str(), fields[2].c_str());
        if (cmp > 0)
          continue;
        if (cmp == 0 && hash != fields[3])
          MWARNING("Two matches found for " << software << " version " << version << " on " << buildtag);
      }
 
      version = fields[2];
      hash = fields[3];
 
      MINFO("Found new version " << version << " with hash " << hash);
      found = true;
    }
    return found;
  }
 
  std::string get_update_url(const std::string &software, const std::string &subdir, const std::string &buildtag, const std::string &version, bool user)
  {
    const char *base = user ? "http://s3-eu-west-1.amazonaws.com/updates.electroneum.com/releases/download/v" : "http://s3-eu-west-1.amazonaws.com/updates.electroneum.com/releases/download/v";
#ifdef _WIN32
    static const char *extension = strncmp(buildtag.c_str(), "install-", 8) ? ".zip" : ".exe";
#else
    static const char extension[] = ".tar.bz2";
#endif
 
    std::string url;
 
    url =  base;
//    if (!subdir.empty())
//      url += subdir + "/";
    url = url + version + "/" + software + "-" + buildtag + "-v" + version + extension;
    return url;
  }
}