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DNS checkpoint updating added, and daemon flag to enforce them

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The daemon should now check for updated checkpoints from
checkpoints.moneropulse.org as well as from the configured json file
every ~1hr (and on launch).

The daemon now has a flag to enable enforcing these checkpoints (rather
    than just printing a warning when they fail).

TODO: an easily configurable list of DNS servers to check for
checkpoints as opposed to the hard-coded "checkpoints.moneropulse.org"
This commit is contained in:
Thomas Winget
2014-09-26 01:01:58 -04:00
parent 30caebfce3
commit b261d9207b
7 changed files with 107 additions and 17 deletions
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50
src/cryptonote_core/checkpoints_create.cpp
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@@ -29,6 +29,9 @@
// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
#include "checkpoints_create.h"
#include "common/dns_utils.h"
#include "include_base_utils.h"
#include <sstream>
#include "storages/portable_storage_template_helper.h" // epee json include
namespace cryptonote
@@ -107,4 +110,51 @@ bool load_checkpoints_from_json(cryptonote::checkpoints& checkpoints, std::strin
return true;
}
bool load_checkpoints_from_dns(cryptonote::checkpoints& checkpoints, const std::string& url)
{
bool avail, valid;
auto records = tools::DNSResolver::instance().get_txt_record(url, avail, valid);
if (avail && !valid)
{
LOG_ERROR("DNSSEC present and failed validation for query to" << url);
return false;
}
for (auto& record : records)
{
auto pos = record.find(":");
if (pos != std::string::npos)
{
uint64_t height;
crypto::hash hash;
// parse the first part as uint64_t,
// if this fails move on to the next record
std::stringstream ss(record.substr(0, pos));
if (!(ss >> height))
{
continue;
}
// parse the second part as crypto::hash,
// if this fails move on to the next record
std::string hashStr = record.substr(pos + 1);
if (!epee::string_tools::parse_tpod_from_hex_string(hashStr, hash))
{
continue;
}
ADD_CHECKPOINT(height, hashStr);
}
}
return true;
}
bool load_new_checkpoints(cryptonote::checkpoints& checkpoints, std::string json_hashfile_fullpath)
{
// TODO: replace hard-coded url with const string or #define
return (load_checkpoints_from_json(checkpoints, json_hashfile_fullpath) && load_checkpoints_from_dns(checkpoints, "checkpoints.moneropulse.org"));
}
} // namespace cryptonote