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diff --git a/nsock/src/nsock_log.h b/nsock/src/nsock_log.h
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+/***************************************************************************
+ * nsock_log.c -- nsock logging infrastructure.                            *
+ *                                                                         *
+ ***********************IMPORTANT NSOCK LICENSE TERMS***********************
+ *
+ * The nsock parallel socket event library is (C) 1999-2023 Nmap Software LLC
+ * This library is free software; you may redistribute and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation; Version 2. This guarantees your right to use, modify, and
+ * redistribute this software under certain conditions. If this license is
+ * unacceptable to you, Nmap Software LLC may be willing to sell alternative
+ * licenses (contact sales@nmap.com ).
+ *
+ * As a special exception to the GPL terms, Nmap Software LLC grants permission
+ * to link the code of this program with any version of the OpenSSL library
+ * which is distributed under a license identical to that listed in the included
+ * docs/licenses/OpenSSL.txt file, and distribute linked combinations including
+ * the two. You must obey the GNU GPL in all respects for all of the code used
+ * other than OpenSSL. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.
+ *
+ * If you received these files with a written license agreement stating terms
+ * other than the (GPL) terms above, then that alternative license agreement
+ * takes precedence over this comment.
+ *
+ * Source is provided to this software because we believe users have a right to
+ * know exactly what a program is going to do before they run it. This also
+ * allows you to audit the software for security holes.
+ *
+ * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+ * new features. You are highly encouraged to send your changes to the
+ * dev@nmap.org mailing list for possible incorporation into the main
+ * distribution. By sending these changes to Fyodor or one of the Insecure.Org
+ * development mailing lists, or checking them into the Nmap source code
+ * repository, it is understood (unless you specify otherwise) that you are
+ * offering the Nmap Project (Nmap Software LLC) the unlimited, non-exclusive
+ * right to reuse, modify, and relicense the code. Nmap will always be available
+ * Open Source, but this is important because the inability to relicense code
+ * has caused devastating problems for other Free Software projects (such as KDE
+ * and NASM). We also occasionally relicense the code to third parties as
+ * discussed above. If you wish to specify special license conditions of your
+ * contributions, just say so when you send them.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License v2.0 for more
+ * details (http://www.gnu.org/licenses/gpl-2.0.html).
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+
+#ifndef NSOCK_LOG_H
+#define NSOCK_LOG_H
+
+#include "nsock.h"
+
+extern nsock_loglevel_t NsockLogLevel;
+extern nsock_logger_t   NsockLogger;
+
+
+#define NSOCK_LOG_WRAP(lvl, ...)  \
+    do { \
+        if (NsockLogger && (lvl) >= NsockLogLevel) { \
+            __nsock_log_internal((lvl), __FILE__, __LINE__, __func__, __VA_ARGS__); \
+        } \
+    } while (0)
+
+
+static inline const char *nsock_loglevel2str(nsock_loglevel_t level)
+{
+  switch (level) {
+    case NSOCK_LOG_DBG_ALL:
+      return "FULL DEBUG";
+    case NSOCK_LOG_DBG:
+      return "DEBUG";
+    case NSOCK_LOG_INFO:
+      return "INFO";
+    case NSOCK_LOG_ERROR:
+      return "ERROR";
+    default:
+      return "???";
+  }
+}
+
+/* -- Internal logging macros -- */
+/**
+ * Most detailed debug messages, like allocating or moving objects.
+ */
+#define nsock_log_debug_all(...) NSOCK_LOG_WRAP(NSOCK_LOG_DBG_ALL, __VA_ARGS__)
+
+/**
+ * Detailed debug messages, describing internal operations.
+ */
+#define nsock_log_debug(...)     NSOCK_LOG_WRAP(NSOCK_LOG_DBG, __VA_ARGS__)
+
+/**
+ * High level debug messages, describing top level operations and external
+ * requests.
+ */
+#define nsock_log_info(...)      NSOCK_LOG_WRAP(NSOCK_LOG_INFO, __VA_ARGS__)
+
+/**
+ * Error messages.
+ */
+#define nsock_log_error(...)     NSOCK_LOG_WRAP(NSOCK_LOG_ERROR, __VA_ARGS__)
+
+
+void __nsock_log_internal(nsock_loglevel_t loglevel, const char *file, int line,
+                          const char *func, const char *format, ...)
+                          __attribute__((format (printf, 5, 6)));
+
+#endif /* NSOCK_LOG_H */
+