5 files changed, 77 insertions, 12 deletions
diff --git a/contrib/epee/src/buffer.cpp b/contrib/epee/src/buffer.cpp
index d637b905e..10ea6de56 100644
--- a/contrib/epee/src/buffer.cpp
+++ b/contrib/epee/src/buffer.cpp
@@ -64,7 +64,8 @@ void buffer::append(const void *data, size_t sz)
       size_t reserve = (((size() + sz) * 3 / 2) + 4095) & ~4095;
       new_storage.reserve(reserve);
       new_storage.resize(size());
-      memcpy(new_storage.data(), storage.data() + offset, storage.size() - offset);
+      if (size() > 0)
+        memcpy(new_storage.data(), storage.data() + offset, storage.size() - offset);
       offset = 0;
       std::swap(storage, new_storage);
     }
diff --git a/contrib/epee/src/connection_basic.cpp b/contrib/epee/src/connection_basic.cpp
index 19f2c7b02..82d9e3b53 100644
--- a/contrib/epee/src/connection_basic.cpp
+++ b/contrib/epee/src/connection_basic.cpp
@@ -284,9 +284,6 @@ double connection_basic::get_sleep_time(size_t cb) {
     return t;
 }
 
-void connection_basic::set_save_graph(bool save_graph) {
-}
-
 
 } // namespace
 } // namespace
diff --git a/contrib/epee/src/net_helper.cpp b/contrib/epee/src/net_helper.cpp
index 3543f5716..719f1c8e0 100644
--- a/contrib/epee/src/net_helper.cpp
+++ b/contrib/epee/src/net_helper.cpp
@@ -11,10 +11,39 @@ namespace net_utils
 		//////////////////////////////////////////////////////////////////////////
 		boost::asio::ip::tcp::resolver resolver(GET_IO_SERVICE(timeout));
 		boost::asio::ip::tcp::resolver::query query(boost::asio::ip::tcp::v4(), addr, port, boost::asio::ip::tcp::resolver::query::canonical_name);
-		boost::asio::ip::tcp::resolver::iterator iterator = resolver.resolve(query);
+
+		bool try_ipv6 = false;
+		boost::asio::ip::tcp::resolver::iterator iterator;
 		boost::asio::ip::tcp::resolver::iterator end;
-		if(iterator == end) // Documentation states that successful call is guaranteed to be non-empty
-			throw boost::system::system_error{boost::asio::error::fault, "Failed to resolve " + addr};
+		boost::system::error_code resolve_error;
+		try
+		{
+			iterator = resolver.resolve(query, resolve_error);
+			if(iterator == end) // Documentation states that successful call is guaranteed to be non-empty
+			{
+				// if IPv4 resolution fails, try IPv6.  Unintentional outgoing IPv6 connections should only
+				// be possible if for some reason a hostname was given and that hostname fails IPv4 resolution,
+				// so at least for now there should not be a need for a flag "using ipv6 is ok"
+				try_ipv6 = true;
+			}
+
+		}
+		catch (const boost::system::system_error& e)
+		{
+			if (resolve_error != boost::asio::error::host_not_found &&
+					resolve_error != boost::asio::error::host_not_found_try_again)
+			{
+				throw;
+			}
+			try_ipv6 = true;
+		}
+		if (try_ipv6)
+		{
+			boost::asio::ip::tcp::resolver::query query6(boost::asio::ip::tcp::v6(), addr, port, boost::asio::ip::tcp::resolver::query::canonical_name);
+			iterator = resolver.resolve(query6);
+			if (iterator == end)
+				throw boost::system::system_error{boost::asio::error::fault, "Failed to resolve " + addr};
+		}
 
 		//////////////////////////////////////////////////////////////////////////
 
diff --git a/contrib/epee/src/net_utils_base.cpp b/contrib/epee/src/net_utils_base.cpp
index 9b781027e..5cc49cc71 100644
--- a/contrib/epee/src/net_utils_base.cpp
+++ b/contrib/epee/src/net_utils_base.cpp
@@ -21,6 +21,37 @@ namespace epee { namespace net_utils
 	bool ipv4_network_address::is_loopback() const { return net_utils::is_ip_loopback(ip()); }
 	bool ipv4_network_address::is_local() const { return net_utils::is_ip_local(ip()); }
 
+	bool ipv6_network_address::equal(const ipv6_network_address& other) const noexcept
+	{ return is_same_host(other) && port() == other.port(); }
+
+	bool ipv6_network_address::less(const ipv6_network_address& other) const noexcept
+	{ return is_same_host(other) ? port() < other.port() : m_address < other.m_address; }
+
+	std::string ipv6_network_address::str() const
+	{ return std::string("[") + host_str() + "]:" + std::to_string(port()); }
+
+	std::string ipv6_network_address::host_str() const { return m_address.to_string(); }
+	bool ipv6_network_address::is_loopback() const { return m_address.is_loopback(); }
+	bool ipv6_network_address::is_local() const { return m_address.is_link_local(); }
+
+
+	bool ipv4_network_subnet::equal(const ipv4_network_subnet& other) const noexcept
+	{ return is_same_host(other) && m_mask == other.m_mask; }
+
+	bool ipv4_network_subnet::less(const ipv4_network_subnet& other) const noexcept
+	{ return subnet() < other.subnet() ? true : (other.subnet() < subnet() ? false : (m_mask < other.m_mask)); }
+
+	std::string ipv4_network_subnet::str() const
+	{ return string_tools::get_ip_string_from_int32(subnet()) + "/" + std::to_string(m_mask); }
+
+	std::string ipv4_network_subnet::host_str() const { return string_tools::get_ip_string_from_int32(subnet()) + "/" + std::to_string(m_mask); }
+	bool ipv4_network_subnet::is_loopback() const { return net_utils::is_ip_loopback(subnet()); }
+	bool ipv4_network_subnet::is_local() const { return net_utils::is_ip_local(subnet()); }
+	bool ipv4_network_subnet::matches(const ipv4_network_address &address) const
+	{
+		return (address.ip() & ~(0xffffffffull << m_mask)) == subnet();
+	}
+
 
 	bool network_address::equal(const network_address& other) const
 	{
diff --git a/contrib/epee/src/wipeable_string.cpp b/contrib/epee/src/wipeable_string.cpp
index 3a6ee5dac..4209b71bf 100644
--- a/contrib/epee/src/wipeable_string.cpp
+++ b/contrib/epee/src/wipeable_string.cpp
@@ -62,13 +62,15 @@ wipeable_string::wipeable_string(wipeable_string &&other)
 wipeable_string::wipeable_string(const std::string &other)
 {
   grow(other.size());
-  memcpy(buffer.data(), other.c_str(), size());
+  if (size() > 0)
+    memcpy(buffer.data(), other.c_str(), size());
 }
 
 wipeable_string::wipeable_string(std::string &&other)
 {
   grow(other.size());
-  memcpy(buffer.data(), other.c_str(), size());
+  if (size() > 0)
+    memcpy(buffer.data(), other.c_str(), size());
   if (!other.empty())
   {
     memwipe(&other[0], other.size()); // we're kinda left with this again aren't we
@@ -79,7 +81,8 @@ wipeable_string::wipeable_string(std::string &&other)
 wipeable_string::wipeable_string(const char *s)
 {
   grow(strlen(s));
-  memcpy(buffer.data(), s, size());
+  if (size() > 0)
+    memcpy(buffer.data(), s, size());
 }
 
 wipeable_string::wipeable_string(const char *s, size_t len)
@@ -112,14 +115,18 @@ void wipeable_string::grow(size_t sz, size_t reserved)
   }
   size_t old_sz = buffer.size();
   std::unique_ptr<char[]> tmp{new char[old_sz]};
-  memcpy(tmp.get(), buffer.data(), old_sz * sizeof(char));
   if (old_sz > 0)
+  {
+    memcpy(tmp.get(), buffer.data(), old_sz * sizeof(char));
     memwipe(buffer.data(), old_sz * sizeof(char));
+  }
   buffer.reserve(reserved);
   buffer.resize(sz);
-  memcpy(buffer.data(), tmp.get(), old_sz * sizeof(char));
   if (old_sz > 0)
+  {
+    memcpy(buffer.data(), tmp.get(), old_sz * sizeof(char));
     memwipe(tmp.get(), old_sz * sizeof(char));
+  }
 }
 
 void wipeable_string::push_back(char c)