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+#!/usr/bin/env python3
+
+# ***********************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/
+# *
+# ***************************************************************************/
+
+import sys
+
+# Check if the given directory, and all its parent directories, are owned and
+# writable only by our euid or by root. If symlinks are present, they are
+# recursively checked, up to a limit of SYMLINK_LIMIT.
+# https://www.securecoding.cert.org/confluence/display/seccode/FIO15-C.+Ensure+that+file+operations+are+performed+in+a+secure+directory
+SYMLINK_LIMIT = 5
+def is_secure_dir(path, num_symlinks=0):
+    import os
+    import os.path
+    import stat
+
+    if not os.path.isabs(path):
+        return False
+
+    if num_symlinks >= SYMLINK_LIMIT:
+        return False
+
+    dirs = []
+    while True:
+        dirs.append(path)
+        dirname = os.path.dirname(path)
+        if dirname == path:
+            break
+        path = dirname
+    # Traverse root-to-leaf.
+    dirs.reverse()
+
+    for dir in dirs:
+        if os.path.islink(dir):
+            link = os.readlink(dir)
+            if not is_secure_dir(link, num_symlinks + 1):
+                return False
+            continue
+        if not os.path.isdir(dir):
+            return False
+        buf = os.stat(dir)
+        if buf.st_uid != os.geteuid() and buf.st_uid != 0:
+            return False
+        if buf.st_mode & (stat.S_IWGRP | stat.S_IWOTH) != 0:
+            return False
+
+    return True
+
+# Add the install_lib directory to sys.path, the list of directories searched
+# for modules, but don't do it if the directory or its parents may be writable
+# by other users. The following line is replaced by the installation program.
+INSTALL_LIB = None
+if INSTALL_LIB is not None and is_secure_dir(INSTALL_LIB):
+    sys.path.append(INSTALL_LIB) # lgtm[py/unreachable-statement]
+
+try:
+    import zenmapGUI.App
+except ImportError as e:
+    print("""\
+Could not import the zenmapGUI.App module: %s.
+I checked in these directories:""" % repr(e.message), file=sys.stderr)
+    for dir in sys.path:
+        print("    %s" % dir, file=sys.stderr)
+    print("""\
+If you installed Zenmap in another directory, you may have to add the
+modules directory to the PYTHONPATH environment variable.""", file=sys.stderr)
+    sys.exit(1)
+
+if __name__ == '__main__':
+    try:
+        zenmapGUI.App.run()
+    except KeyboardInterrupt:
+        sys.exit(1)