DNS monero address aliasing and seed node lookup

CMake/FindUnbound.cmake

@@ -0,0 +1,55 @@
+# 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.
+
+include (CheckIncludeFiles)
+include (CheckLibraryExists)
+include (CheckSymbolExists)
+
+set (Unbound_FOUND FALSE)
+MESSAGE("Attempting to find libunbound")
+
+#FIND_PATH("unbound.h" CMAKE_HAVE_UNBOUND_H)
+MESSAGE("CMAKE_INCLUDE_PATH: ${CMAKE_INCLUDE_PATH}")
+MESSAGE("CMAKE_SYSTEM_INCLUDE_PATH: ${CMAKE_SYSTEM_INCLUDE_PATH}")
+CHECK_INCLUDE_FILES("unbound.h" CMAKE_HAVE_UNBOUND_H)
+MESSAGE("CMAKE_HAVE_UNBOUND_H: ${CMAKE_HAVE_UNBOUND_H}")
+
+if(CMAKE_HAVE_UNBOUND_H)
+
+  MESSAGE("unbound.h found")
+
+  CHECK_LIBRARY_EXISTS(unbound ub_ctx_create "" CMAKE_HAVE_UNBOUND)
+
+  if(CMAKE_HAVE_UNBOUND)
+    MESSAGE("-lunbound works?")
+    set(CMAKE_UNBOUND_LIB "-lunbound")
+    set(Unbound_FOUND TRUE)
+  endif()
+endif()
+
+include(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Unbound DEFAULT_MSG Unbound_FOUND)

CMakeLists.txt

@@ -30,6 +30,8 @@
 
 cmake_minimum_required(VERSION 2.8.6)
 
+set (CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/CMake")
+
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 set(CMAKE_CONFIGURATION_TYPES "Debug;Release")
 enable_testing()
@@ -70,6 +72,8 @@ if (UNIX AND NOT APPLE)
   find_package(Threads)
 endif()
 
+find_package(Unbound REQUIRED)
+
 if(MSVC)
   add_definitions("/bigobj /MP /W3 /GS- /D_CRT_SECURE_NO_WARNINGS /wd4996 /wd4345 /D_WIN32_WINNT=0x0600 /DWIN32_LEAN_AND_MEAN /DGTEST_HAS_TR1_TUPLE=0 /FIinline_c.h /D__SSE4_1__")
   # set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Dinline=__inline")

src/CMakeLists.txt

@@ -60,13 +60,13 @@ add_library(cryptonote_core ${CRYPTONOTE_CORE})
 add_executable(daemon ${DAEMON} ${P2P} ${CRYPTONOTE_PROTOCOL})
 add_executable(connectivity_tool ${CONN_TOOL})
 add_executable(simpleminer ${MINER})
-target_link_libraries(daemon rpc cryptonote_core crypto common ${UPNP_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} ${Boost_LIBRARIES})
-target_link_libraries(connectivity_tool cryptonote_core crypto common ${CMAKE_THREAD_LIBS_INIT} ${Boost_LIBRARIES})
-target_link_libraries(simpleminer cryptonote_core crypto common ${CMAKE_THREAD_LIBS_INIT} ${Boost_LIBRARIES})
+target_link_libraries(daemon rpc cryptonote_core crypto common ${UPNP_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} ${Boost_LIBRARIES} ${CMAKE_UNBOUND_LIB})
+target_link_libraries(connectivity_tool cryptonote_core crypto common ${CMAKE_THREAD_LIBS_INIT} ${Boost_LIBRARIES} ${CMAKE_UNBOUND_LIB})
+target_link_libraries(simpleminer cryptonote_core crypto common ${CMAKE_THREAD_LIBS_INIT} ${Boost_LIBRARIES} ${CMAKE_UNBOUND_LIB})
 add_library(rpc ${RPC})
 add_library(wallet ${WALLET})
 add_executable(simplewallet ${SIMPLEWALLET} )
-target_link_libraries(simplewallet wallet rpc cryptonote_core crypto common ${UPNP_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} ${Boost_LIBRARIES})
+target_link_libraries(simplewallet wallet rpc cryptonote_core crypto common ${UPNP_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} ${Boost_LIBRARIES} ${CMAKE_UNBOUND_LIB})
 add_dependencies(daemon version)
 add_dependencies(rpc version)
 add_dependencies(simplewallet version)

src/common/dns_utils.cpp

@@ -0,0 +1,191 @@
+// 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.
+
+#include "common/dns_utils.h"
+#include <ldns/rr.h> // for RR type and class defs
+#include <unbound.h>
+#include <arpa/inet.h> // for inet_ntoa (bytes to text for IPs)
+
+namespace tools
+{
+
+// custom smart pointer.
+// TODO: see if std::auto_ptr and the like support custom destructors
+class ub_result_ptr
+{
+public:
+  ub_result_ptr()
+  {
+    ptr = nullptr;
+  }
+  ~ub_result_ptr()
+  {
+    ub_resolve_free(ptr);
+  }
+  ub_result* ptr;
+};
+
+struct DNSResolverData
+{
+  ub_ctx* m_ub_context;
+};
+
+DNSResolver::DNSResolver() : m_data(new DNSResolverData())
+{
+  // init libunbound context
+  m_data->m_ub_context = ub_ctx_create();
+
+  // look for "/etc/resolv.conf" and "/etc/hosts" or platform equivalent
+  ub_ctx_resolvconf(m_data->m_ub_context, "");
+  ub_ctx_hosts(m_data->m_ub_context, "");
+}
+
+DNSResolver::~DNSResolver()
+{
+  if (m_data)
+  {
+    if (m_data->m_ub_context != NULL)
+    {
+      ub_ctx_delete(m_data->m_ub_context);
+    }
+    delete m_data;
+  }
+}
+
+std::vector<std::string> DNSResolver::get_ipv4(const std::string& url)
+{
+  std::vector<std::string> addresses;
+
+  if (!check_address_syntax(url))
+  {
+    return addresses;
+  }
+
+  // destructor takes care of cleanup
+  ub_result_ptr result;
+
+  // call DNS resolver, blocking.  if return value not zero, something went wrong
+  if (!ub_resolve(m_data->m_ub_context, url.c_str(), LDNS_RR_TYPE_A, LDNS_RR_CLASS_IN, &(result.ptr)))
+  {
+    if (result.ptr->havedata)
+    {
+      for (size_t i=0; result.ptr->data[i] != NULL; i++)
+      {
+        char as_str[INET_ADDRSTRLEN];
+
+        // convert bytes to string, append if no error
+        if (inet_ntop(AF_INET, result.ptr->data[i], as_str, sizeof(as_str)))
+        {
+          addresses.push_back(as_str);
+        }
+      }
+    }
+  }
+
+  return addresses;
+}
+
+std::vector<std::string> DNSResolver::get_ipv6(const std::string& url)
+{
+  std::vector<std::string> addresses;
+
+  if (!check_address_syntax(url))
+  {
+    return addresses;
+  }
+
+  ub_result_ptr result;
+
+  // call DNS resolver, blocking.  if return value not zero, something went wrong
+  if (!ub_resolve(m_data->m_ub_context, url.c_str(), LDNS_RR_TYPE_AAAA, LDNS_RR_CLASS_IN, &(result.ptr)))
+  {
+    if (result.ptr->havedata)
+    {
+      for (size_t i=0; result.ptr->data[i] != NULL; i++)
+      {
+        char as_str[INET6_ADDRSTRLEN];
+
+        // convert bytes to string, append if no error
+        if (inet_ntop(AF_INET6, result.ptr->data[i], as_str, sizeof(as_str)))
+        {
+          addresses.push_back(as_str);
+        }
+      }
+    }
+  }
+
+  return addresses;
+}
+
+std::vector<std::string> DNSResolver::get_txt_record(const std::string& url)
+{
+  std::vector<std::string> records;
+
+  if (!check_address_syntax(url))
+  {
+    return records;
+  }
+
+  ub_result_ptr result;
+
+  // call DNS resolver, blocking.  if return value not zero, something went wrong
+  if (!ub_resolve(m_data->m_ub_context, url.c_str(), LDNS_RR_TYPE_TXT, LDNS_RR_CLASS_IN, &(result.ptr)))
+  {
+    if (result.ptr->havedata)
+    {
+      for (size_t i=0; result.ptr->data[i] != NULL; i++)
+      {
+        records.push_back(result.ptr->data[i]);
+      }
+    }
+  }
+
+  return records;
+}
+
+DNSResolver& DNSResolver::instance()
+{
+  static DNSResolver* staticInstance = NULL;
+  if (staticInstance == NULL)
+  {
+    staticInstance = new DNSResolver();
+  }
+  return *staticInstance;
+}
+
+bool DNSResolver::check_address_syntax(const std::string& addr)
+{
+  // if string doesn't contain a dot, we won't consider it a url for now.
+  if (addr.find(".") == std::string::npos)
+  {
+    return false;
+  }
+  return true;
+}
+
+}  // namespace tools