Merge pull request #165

c0bdd51 Daemon should now exit on conflicting checkpoints (Thomas Winget)
f0b4138 various changes to runtime checkpoint updating (Thomas Winget)
7568f89 Fixed segfault with checkpoints loading (Thomas Winget)
b261d92 DNS checkpoint updating added, and daemon flag to enforce them (Thomas Winget)
30caebf reload checkpoints file every ~hr and print if any fail (Thomas Winget)
0e14491 updated DNSResolver/things that use it for DNSSEC (Thomas Winget)
6f2c2e1 Adding an identical existing checkpoint should not error (Thomas Winget)

1 files changed, 193 insertions, 0 deletions

diff --git a/src/cryptonote_core/checkpoints_create.cpp b/src/cryptonote_core/checkpoints_create.cpp
new file mode 100644
index 000000000..808bc46a7
--- /dev/null
+++ b/src/cryptonote_core/checkpoints_create.cpp
@@ -0,0 +1,193 @@
+// Copyright (c) 2014, 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.
+// 
+// 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 <random>
+#include "storages/portable_storage_template_helper.h" // epee json include
+
+namespace cryptonote
+{
+
+struct t_hashline 
+{
+	uint64_t height;
+	std::string hash;
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(height)
+        KV_SERIALIZE(hash)
+      END_KV_SERIALIZE_MAP()
+};
+
+struct t_hash_json {
+ 	std::vector<t_hashline> hashlines;
+      BEGIN_KV_SERIALIZE_MAP()
+        KV_SERIALIZE(hashlines)
+      END_KV_SERIALIZE_MAP()
+};
+
+bool create_checkpoints(cryptonote::checkpoints& checkpoints)
+{      
+  ADD_CHECKPOINT(1,     "771fbcd656ec1464d3a02ead5e18644030007a0fc664c0a964d30922821a8148");
+  ADD_CHECKPOINT(10,    "c0e3b387e47042f72d8ccdca88071ff96bff1ac7cde09ae113dbb7ad3fe92381");
+  ADD_CHECKPOINT(100,   "ac3e11ca545e57c49fca2b4e8c48c03c23be047c43e471e1394528b1f9f80b2d");
+  ADD_CHECKPOINT(1000,  "5acfc45acffd2b2e7345caf42fa02308c5793f15ec33946e969e829f40b03876");
+  ADD_CHECKPOINT(10000, "c758b7c81f928be3295d45e230646de8b852ec96a821eac3fea4daf3fcac0ca2");
+  ADD_CHECKPOINT(22231, "7cb10e29d67e1c069e6e11b17d30b809724255fee2f6868dc14cfc6ed44dfb25");
+  ADD_CHECKPOINT(29556, "53c484a8ed91e4da621bb2fa88106dbde426fe90d7ef07b9c1e5127fb6f3a7f6");
+  ADD_CHECKPOINT(50000, "0fe8758ab06a8b9cb35b7328fd4f757af530a5d37759f9d3e421023231f7b31c");
+  ADD_CHECKPOINT(80000, "a62dcd7b536f22e003ebae8726e9e7276f63d594e264b6f0cd7aab27b66e75e3");
+  ADD_CHECKPOINT(202612, "bbd604d2ba11ba27935e006ed39c9bfdd99b76bf4a50654bc1e1e61217962698");
+  ADD_CHECKPOINT(202613, "e2aa337e78df1f98f462b3b1e560c6b914dec47b610698b7b7d1e3e86b6197c2");
+  ADD_CHECKPOINT(202614, "c29e3dc37d8da3e72e506e31a213a58771b24450144305bcba9e70fa4d6ea6fb");
+  ADD_CHECKPOINT(205000, "5d3d7a26e6dc7535e34f03def711daa8c263785f73ec1fadef8a45880fde8063");
+  ADD_CHECKPOINT(220000, "9613f455933c00e3e33ac315cc6b455ee8aa0c567163836858c2d9caff111553");
+  ADD_CHECKPOINT(230300, "bae7a80c46859db355556e3a9204a337ae8f24309926a1312323fdecf1920e61");
+  ADD_CHECKPOINT(230700, "93e631240ceac831da1aebfc5dac8f722c430463024763ebafa888796ceaeedf");
+  ADD_CHECKPOINT(231350, "b5add137199b820e1ea26640e5c3e121fd85faa86a1e39cf7e6cc097bdeb1131");
+  ADD_CHECKPOINT(232150, "955de8e6b6508af2c24f7334f97beeea651d78e9ade3ab18fec3763be3201aa8");
+
+  return true;
+}
+
+bool load_checkpoints_from_json(cryptonote::checkpoints& checkpoints, std::string json_hashfile_fullpath)
+{
+  boost::system::error_code errcode;
+  if (! (boost::filesystem::exists(json_hashfile_fullpath, errcode)))
+  {
+    LOG_PRINT_L0("Blockchain checkpoints file not found");
+    return true;
+  }
+
+  LOG_PRINT_L0("Adding checkpoints from blockchain hashfile");
+
+  uint64_t prev_max_height = checkpoints.get_max_height();
+  LOG_PRINT_L0("Hard-coded max checkpoint height is " << prev_max_height);
+  t_hash_json hashes;
+  epee::serialization::load_t_from_json_file(hashes, json_hashfile_fullpath);
+  for (std::vector<t_hashline>::const_iterator it = hashes.hashlines.begin(); it != hashes.hashlines.end(); )
+  {
+      uint64_t height;
+      height = it->height;
+      if (height <= prev_max_height) {
+	LOG_PRINT_L0("ignoring checkpoint height " << height);
+      } else {
+	std::string blockhash = it->hash;
+	LOG_PRINT_L0("Adding checkpoint height " << height << ", hash=" << blockhash);
+	ADD_CHECKPOINT(height, blockhash);
+      }
+      ++it;
+  }
+
+  return true;
+}
+
+bool load_checkpoints_from_dns(cryptonote::checkpoints& checkpoints)
+{
+  static const std::vector<std::string> dns_urls = { "checkpoints.moneropulse.se"
+						   , "checkpoints.moneropulse.org"
+						   , "checkpoints.moneropulse.net"
+						   , "checkpoints.moneropulse.co"
+  };
+  bool avail, valid;
+  std::vector<std::string> records;
+
+  std::random_device rd;
+  std::mt19937 gen(rd());
+  std::uniform_int_distribution<int> dis(0, dns_urls.size() - 1);
+  int first_index = dis(gen);
+
+  int cur_index = first_index;
+  do
+  {
+    records = tools::DNSResolver::instance().get_txt_record(dns_urls[cur_index], avail, valid);
+    if (records.size() == 0 || (avail && !valid))
+    {
+      cur_index++;
+      if (cur_index == dns_urls.size())
+      {
+	cur_index = 0;
+      }
+      continue;
+    }
+    break;
+  } while (cur_index != first_index);
+
+  if (records.size() == 0)
+  {
+    LOG_PRINT_L1("Fetching checkpoints from DNS TXT records failed, no TXT records available.");
+    return true;
+  }
+
+  if (avail && !valid)
+  {
+    LOG_PRINT_L0("DNSSEC present and failed validation for query last url, and all other urls either failed validation or returned no records");
+    return true;
+  }
+
+  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));
+}
+
+}  // namespace cryptonote