Merge pull request cpp-netlib#679 from vovams/0.13-release-integration

Fix cpp-netlib#677 in 0.13: Exception in async_server_base/async_connection during port scanning (nmap)

Author: glynos

boost/network/protocol/http/server/async_connection.hpp

@@ -462,11 +462,18 @@ struct async_connection
   enum state_t { method, uri, version, headers };
 
   void start() {
-    typename ostringstream<Tag>::type ip_stream;
-    ip_stream << socket_.remote_endpoint().address().to_string() << ':'
-              << socket_.remote_endpoint().port();
-    request_.source = ip_stream.str();
-    read_more(method);
+    boost::system::error_code ec;
+    auto remote_endpoint = socket_.remote_endpoint(ec);
+    
+    if (ec) {
+      error_encountered = in_place<boost::system::system_error>(ec);
+    } else {
+      typename ostringstream<Tag>::type ip_stream;
+      ip_stream << remote_endpoint.address().to_string() << ':'
+                << remote_endpoint.port();
+      request_.source = ip_stream.str();
+      read_more(method);
+    }
   }
 
   void read_more(state_t state) {

boost/network/protocol/stream_handler.hpp

@@ -103,12 +103,21 @@ struct stream_handler {
     }
   }
 
-  tcp_socket::endpoint_type remote_endpoint() const {
+  tcp_socket::endpoint_type remote_endpoint(boost::system::error_code& ec) const {
     if (ssl_enabled) {
-      return ssl_sock_->next_layer().remote_endpoint();
+      return ssl_sock_->next_layer().remote_endpoint(ec);
     } else {
-      return tcp_sock_->remote_endpoint();
+      return tcp_sock_->remote_endpoint(ec);
+    }
+  }
+
+  tcp_socket::endpoint_type remote_endpoint() const {
+    boost::system::error_code ec;
+    tcp_socket::endpoint_type r = remote_endpoint(ec);
+    if (ec) {
+      boost::asio::detail::throw_error(ec, "remote_endpoint");
     }
+    return r;
   }
 
   void shutdown(boost::asio::socket_base::shutdown_type st,