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diff --git a/ncat/util.h b/ncat/util.h
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+/***************************************************************************
+ * util.h                                                                  *
+ ***********************IMPORTANT NMAP LICENSE TERMS************************
+ *
+ * The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
+ * Project"). Nmap is also a registered trademark of the Nmap Project.
+ *
+ * This program is distributed under the terms of the Nmap Public Source
+ * License (NPSL). The exact license text applying to a particular Nmap
+ * release or source code control revision is contained in the LICENSE
+ * file distributed with that version of Nmap or source code control
+ * revision. More Nmap copyright/legal information is available from
+ * https://nmap.org/book/man-legal.html, and further information on the
+ * NPSL license itself can be found at https://nmap.org/npsl/ . This
+ * header summarizes some key points from the Nmap license, but is no
+ * substitute for the actual license text.
+ *
+ * Nmap is generally free for end users to download and use themselves,
+ * including commercial use. It is available from https://nmap.org.
+ *
+ * The Nmap license generally prohibits companies from using and
+ * redistributing Nmap in commercial products, but we sell a special Nmap
+ * OEM Edition with a more permissive license and special features for
+ * this purpose. See https://nmap.org/oem/
+ *
+ * If you have received a written Nmap license agreement or contract
+ * stating terms other than these (such as an Nmap OEM license), you may
+ * choose to use and redistribute Nmap under those terms instead.
+ *
+ * The official Nmap Windows builds include the Npcap software
+ * (https://npcap.com) for packet capture and transmission. It is under
+ * separate license terms which forbid redistribution without special
+ * permission. So the official Nmap Windows builds may not be redistributed
+ * without special permission (such as an Nmap OEM license).
+ *
+ * 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 submit your changes as a Github PR
+ * or by email to the dev@nmap.org mailing list for possible incorporation into
+ * the main distribution. Unless you specify otherwise, it is understood that
+ * you are offering us very broad rights to use your submissions as described in
+ * the Nmap Public Source License Contributor Agreement. This is important
+ * because we fund the project by selling licenses with various terms, and also
+ * because the inability to relicense code has caused devastating problems for
+ * other Free Software projects (such as KDE and NASM).
+ *
+ * The free version of Nmap 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. Warranties,
+ * indemnification and commercial support are all available through the
+ * Npcap OEM program--see https://nmap.org/oem/
+ *
+ ***************************************************************************/
+
+/* $Id$ */
+
+#ifndef UTIL_H_
+#define UTIL_H_
+
+#include "ncat_config.h"
+
+#include "nbase.h"
+#ifndef WIN32
+#include <sys/types.h>
+#include <netinet/in.h>
+#endif
+
+#include "sockaddr_u.h"
+
+#if HAVE_SYS_UN_H
+#include <sys/un.h>
+#include <string.h>
+
+#define NCAT_INIT_SUN(_Sock, _Source) do { \
+  memset(_Sock, 0, sizeof(union sockaddr_u)); \
+  (_Sock)->un.sun_family = AF_UNIX; \
+  if (strlen(_Source) > sizeof((_Sock)->un.sun_path) - 1) \
+    bye("Socket path length is too long. Max: %lu", sizeof((_Sock)->un.sun_path) - 1); \
+  strncpy((_Sock)->un.sun_path, _Source, sizeof((_Sock)->un.sun_path) - 1); \
+} while (0);
+
+#endif
+
+#ifdef HAVE_OPENSSL
+#include <openssl/ssl.h>
+#endif
+
+/* add/multiply unsigned values safely */
+size_t sadd(size_t, size_t);
+size_t smul(size_t, size_t);
+
+#ifdef WIN32
+void windows_init();
+#endif
+
+void loguser(const char *fmt, ...)
+     __attribute__ ((format (printf, 1, 2)));
+void loguser_noprefix(const char *fmt, ...)
+     __attribute__ ((format (printf, 1, 2)));
+void logdebug(const char *fmt, ...)
+     __attribute__ ((format (printf, 1, 2)));
+void logtest(const char *fmt, ...)
+     __attribute__ ((format (printf, 1, 2)));
+
+/* handle errors */
+
+#define ncat_assert(expr) \
+do { \
+        if (!(expr)) \
+                bye("assertion failed: %s", #expr); \
+} while (0)
+
+void die(char *);
+
+NORETURN void bye(const char *, ...)
+     __attribute__ ((format (printf, 1, 2)));
+
+/* zero out some memory, bzero() is deprecated */
+void zmem(void *, size_t);
+
+int strbuf_append(char **buf, size_t *size, size_t *offset, const char *s, size_t n);
+
+int strbuf_append_str(char **buf, size_t *size, size_t *offset, const char *s);
+
+int strbuf_sprintf(char **buf, size_t *size, size_t *offset, const char *fmt, ...)
+     __attribute__ ((format (printf, 4, 5)));
+
+int addr_is_local(const union sockaddr_u *su);
+
+const char *socktop(const union sockaddr_u *su, socklen_t ss_len);
+const char *inet_socktop(const union sockaddr_u *su);
+
+unsigned short inet_port(const union sockaddr_u *su);
+
+int do_listen(int, int, const union sockaddr_u *);
+
+
+int do_connect(int);
+
+unsigned char *buildsrcrte(struct in_addr dstaddr, struct in_addr routes[],
+                  int numroutes, int ptr, size_t *len);
+
+int allow_access(const union sockaddr_u *su);
+
+void ms_to_timeval(struct timeval *tv, long ms)
+    __attribute__ ((nonnull));
+
+struct fdinfo {
+    int fd;
+    int lasterr;
+    union sockaddr_u remoteaddr;
+    socklen_t ss_len;
+#ifdef HAVE_OPENSSL
+    SSL *ssl;
+#endif
+};
+
+typedef struct fd_list {
+    struct fdinfo *fds;
+    int nfds, maxfds, fdmax;
+    int state; /* incremented each time the list is modified */
+} fd_list_t;
+
+int add_fdinfo(fd_list_t *, struct fdinfo *);
+int add_fd(fd_list_t *fdl, int fd);
+int rm_fd(fd_list_t *, int);
+void free_fdlist(fd_list_t *);
+void init_fdlist(fd_list_t *, int);
+int get_maxfd(fd_list_t *);
+struct fdinfo *get_fdinfo(const fd_list_t *, int);
+
+int fix_line_endings(char *src, int *len, char **dst, int *state);
+
+unsigned char *next_protos_parse(size_t *outlen, const char *in);
+
+#endif