#!/usr/bin/env python
# -*- coding: utf-8 -*-

# ***********************IMPORTANT NMAP LICENSE TERMS************************
# *                                                                         *
# * The Nmap Security Scanner is (C) 1996-2018 Insecure.Com LLC ("The Nmap  *
# * Project"). Nmap is also a registered trademark of the Nmap Project.     *
# * This program 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 ("GPL"), BUT ONLY WITH ALL OF THE   *
# * CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN.  This guarantees your   *
# * right to use, modify, and redistribute this software under certain      *
# * conditions.  If you wish to embed Nmap technology into proprietary      *
# * software, we sell alternative licenses (contact sales@nmap.com).        *
# * Dozens of software vendors already license Nmap technology such as      *
# * host discovery, port scanning, OS detection, version detection, and     *
# * the Nmap Scripting Engine.                                              *
# *                                                                         *
# * Note that the GPL places important restrictions on "derivative works",  *
# * yet it does not provide a detailed definition of that term.  To avoid   *
# * misunderstandings, we interpret that term as broadly as copyright law   *
# * allows.  For example, we consider an application to constitute a        *
# * derivative work for the purpose of this license if it does any of the   *
# * following with any software or content covered by this license          *
# * ("Covered Software"):                                                   *
# *                                                                         *
# * o Integrates source code from Covered Software.                         *
# *                                                                         *
# * o Reads or includes copyrighted data files, such as Nmap's nmap-os-db   *
# * or nmap-service-probes.                                                 *
# *                                                                         *
# * o Is designed specifically to execute Covered Software and parse the    *
# * results (as opposed to typical shell or execution-menu apps, which will *
# * execute anything you tell them to).                                     *
# *                                                                         *
# * o Includes Covered Software in a proprietary executable installer.  The *
# * installers produced by InstallShield are an example of this.  Including *
# * Nmap with other software in compressed or archival form does not        *
# * trigger this provision, provided appropriate open source decompression  *
# * or de-archiving software is widely available for no charge.  For the    *
# * purposes of this license, an installer is considered to include Covered *
# * Software even if it actually retrieves a copy of Covered Software from  *
# * another source during runtime (such as by downloading it from the       *
# * Internet).                                                              *
# *                                                                         *
# * o Links (statically or dynamically) to a library which does any of the  *
# * above.                                                                  *
# *                                                                         *
# * o Executes a helper program, module, or script to do any of the above.  *
# *                                                                         *
# * This list is not exclusive, but is meant to clarify our interpretation  *
# * of derived works with some common examples.  Other people may interpret *
# * the plain GPL differently, so we consider this a special exception to   *
# * the GPL that we apply to Covered Software.  Works which meet any of     *
# * these conditions must conform to all of the terms of this license,      *
# * particularly including the GPL Section 3 requirements of providing      *
# * source code and allowing free redistribution of the work as a whole.    *
# *                                                                         *
# * As another special exception to the GPL terms, the Nmap Project 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.                                  *
# *                                                                         *
# * The Nmap Project has permission to redistribute Npcap, a packet         *
# * capturing driver and library for the Microsoft Windows platform.        *
# * Npcap is a separate work with it's own license rather than this Nmap    *
# * license.  Since the Npcap license does not permit redistribution        *
# * without special permission, our Nmap Windows binary packages which      *
# * contain Npcap may not be redistributed without special permission.      *
# *                                                                         *
# * Any redistribution of Covered Software, including any derived works,    *
# * must obey and carry forward all of the terms of this license, including *
# * obeying all GPL rules and restrictions.  For example, source code of    *
# * the whole work must be provided and free redistribution must be         *
# * allowed.  All GPL references to "this License", are to be treated as    *
# * including the terms and conditions of this license text as well.        *
# *                                                                         *
# * Because this license imposes special exceptions to the GPL, Covered     *
# * Work may not be combined (even as part of a larger work) with plain GPL *
# * software.  The terms, conditions, and exceptions of this license must   *
# * be included as well.  This license is incompatible with some other open *
# * source licenses as well.  In some cases we can relicense portions of    *
# * Nmap or grant special permissions to use it in other open source        *
# * software.  Please contact fyodor@nmap.org with any such requests.       *
# * Similarly, we don't incorporate incompatible open source software into  *
# * Covered Software without special permission from the copyright holders. *
# *                                                                         *
# * If you have any questions about the licensing restrictions on using     *
# * Nmap in other works, we are happy to help.  As mentioned above, we also *
# * offer an alternative license to integrate Nmap into proprietary         *
# * applications and appliances.  These contracts have been sold to dozens  *
# * of software vendors, and generally include a perpetual license as well  *
# * as providing support and updates.  They also fund the continued         *
# * development of Nmap.  Please email sales@nmap.com for further           *
# * information.                                                            *
# *                                                                         *
# * If you have received a written license agreement or contract for        *
# * Covered Software stating terms other than these, you may choose to use  *
# * and redistribute Covered Software under those terms instead of these.   *
# *                                                                         *
# * 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 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 Nmap      *
# * license file for more details (it's in a COPYING file included with     *
# * Nmap, and also available from https://svn.nmap.org/nmap/COPYING)        *
# *                                                                         *
# ***************************************************************************/

import locale
import sys
import gobject
import gtk
import gtk.gdk
import pango
import re

import zenmapCore.I18N
from zenmapCore.UmitLogging import log
from zenmapCore.UmitConf import NmapOutputHighlight

from zenmapGUI.NmapOutputProperties import NmapOutputProperties


class NmapOutputViewer (gtk.VBox):
    HIGHLIGHT_PROPERTIES = ["details", "date", "hostname", "ip", "port_list",
            "open_port", "closed_port", "filtered_port"]

    def __init__(self, refresh=1, stop=1):
        self.nmap_highlight = NmapOutputHighlight()
        gtk.VBox.__init__(self)

        # Creating widgets
        self.__create_widgets()

        # Setting scrolled window
        self.__set_scrolled_window()

        # Setting text view
        self.__set_text_view()

        buffer = self.text_view.get_buffer()
        # The end mark is used to scroll to the bottom of the display.
        self.end_mark = buffer.create_mark(None, buffer.get_end_iter(), False)

        self.refreshing = True

        # Adding widgets to the VBox
        self.pack_start(self.scrolled, expand=True, fill=True)

        # The NmapCommand instance, if any, whose output is shown in this
        # display.
        self.command_execution = None
        # The position of the last read from the output stream.
        self.output_file_pointer = None

    def __create_widgets(self):
        # Creating widgets
        self.scrolled = gtk.ScrolledWindow()
        self.text_view = gtk.TextView()

    def __set_scrolled_window(self):
        # Seting scrolled window
        self.scrolled.set_border_width(5)
        self.scrolled.add(self.text_view)
        self.scrolled.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)

    def __set_text_view(self):
        self.text_view.set_wrap_mode(gtk.WRAP_WORD)
        self.text_view.set_editable(False)

        self.tag_font = self.text_view.get_buffer().create_tag(None)
        self.tag_font.set_property("family", "Monospace")
        for property in self.HIGHLIGHT_PROPERTIES:
            settings = self.nmap_highlight.__getattribute__(property)
            tag = self.text_view.get_buffer().create_tag(property)

            if settings[0]:
                tag.set_property("weight", pango.WEIGHT_HEAVY)
            else:
                tag.set_property("weight", pango.WEIGHT_NORMAL)

            if settings[1]:
                tag.set_property("style", pango.STYLE_ITALIC)
            else:
                tag.set_property("style", pango.STYLE_NORMAL)

            if settings[2]:
                tag.set_property("underline", pango.UNDERLINE_SINGLE)
            else:
                tag.set_property("underline", pango.UNDERLINE_NONE)

            text_color = settings[3]
            highlight_color = settings[4]

            tag.set_property(
                    "foreground", gtk.color_selection_palette_to_string(
                        [gtk.gdk.Color(*text_color), ]))
            tag.set_property(
                    "background", gtk.color_selection_palette_to_string(
                        [gtk.gdk.Color(*highlight_color), ]))

    def go_to_host(self, host):
        """Go to host line on nmap output result"""
        buff = self.text_view.get_buffer()
        start_iter = buff.get_start_iter()

        found_tuple = start_iter.forward_search(
                "\nNmap scan report for %s\n" % host, gtk.TEXT_SEARCH_TEXT_ONLY
                )
        if found_tuple is None:
                return

        found = found_tuple[0]
        if not found.forward_line():
            return
        self.text_view.scroll_to_iter(found, 0, True, 0, 0)

    def show_output_properties(self, widget):
        nmap_out_prop = NmapOutputProperties(self.text_view)

        nmap_out_prop.run()

        for prop in nmap_out_prop.property_names:
            widget = nmap_out_prop.property_names[prop][8]

            wid_props = []

            if widget.bold:
                wid_props.append(1)
            else:
                wid_props.append(0)

            if widget.italic:
                wid_props.append(1)
            else:
                wid_props.append(0)

            if widget.underline:
                wid_props.append(1)
            else:
                wid_props.append(0)

            wid_props.append("(%s, %s, %s)" % (widget.text_color.red,
                                               widget.text_color.green,
                                               widget.text_color.blue))
            wid_props.append("(%s, %s, %s)" % (widget.highlight_color.red,
                                               widget.highlight_color.green,
                                               widget.highlight_color.blue))

            self.nmap_highlight.__setattr__(widget.property_name, wid_props)

        nmap_out_prop.destroy()
        self.nmap_highlight.save_changes()
        self.apply_highlighting()

    def apply_highlighting(self, start_iter=None, end_iter=None):
        buf = self.text_view.get_buffer()

        if start_iter is None:
            start_iter = buf.get_start_iter()
        else:
            # Patterns are line-oriented; start on a line boundary.
            start_iter.backward_line()
        if end_iter is None:
            end_iter = buf.get_end_iter()

        buf.apply_tag(self.tag_font, start_iter, end_iter)

        if not self.nmap_highlight.enable:
            return

        text = buf.get_text(start_iter, end_iter)

        for property in self.HIGHLIGHT_PROPERTIES:
            settings = self.nmap_highlight.__getattribute__(property)
            for m in re.finditer(settings[5], text, re.M):
                m_start_iter = start_iter.copy()
                m_start_iter.forward_chars(m.start())
                m_end_iter = start_iter.copy()
                m_end_iter.forward_chars(m.end())
                buf.apply_tag_by_name(property, m_start_iter, m_end_iter)

    def show_nmap_output(self, output):
        """Show the string (or unicode) output in the output display."""
        try:
            self.text_view.get_buffer().set_text(output)
            self.apply_highlighting()
        except MemoryError:
            self.show_large_output_message(self.command_execution)

    def set_command_execution(self, command):
        """Set the live running command whose output is shown by this display.
        The current output is extracted from the command object."""
        self.command_execution = command
        if command is not None:
            self.text_view.get_buffer().set_text(u"")
            self.output_file_pointer = 0
        else:
            self.output_file_pointer = None
        self.refresh_output()

    def show_large_output_message(self, command=None):
        buf = self.text_view.get_buffer()
        try:
            running = (command is not None and command.scan_state() is True)
        except:
            running = False
            complete = False
        else:
            complete = not running
        if running:
            buf.set_text("Warning: You have insufficient resources for Zenmap "
                "to be able to display the complete output from Nmap here. \n"
                "Zenmap will continue to run the scan to completion. However,"
                " some features of Zenmap might not work as expected.")
        elif complete:
            buf.set_text("Warning: You have insufficient resources for Zenmap "
                "to be able to display the complete output from Nmap here. \n"
                "The scan has completed. However, some features of Zenmap "
                "might not work as expected.")
        else:
            buf.set_text("Warning: You have insufficient resources for Zenmap "
                "to be able to display the complete output from Nmap here. \n"
                "The scan has been stopped. Some features of Zenmap might not "
                "work as expected.")

    def refresh_output(self, widget=None):
        """Update the output from the latest output of the command associated
        with this view, as set by set_command_execution. It has no effect if no
        command has been set."""
        log.debug("Refresh nmap output")

        if self.command_execution is None:
            return

        # Seek to the end of the most recent read.
        self.command_execution.stdout_file.seek(self.output_file_pointer)
        pos = self.command_execution.stdout_file.tell()

        try:
            new_output = self.command_execution.stdout_file.read()
        except MemoryError:
            self.show_large_output_message(self.command_execution)
            return

        self.output_file_pointer = self.command_execution.stdout_file.tell()
        # print "read %d -> %d %d" % (
        #         pos, self.output_file_pointer, len(new_output))

        v_adj = self.scrolled.get_vadjustment()
        if new_output and v_adj is not None:
            # Find out if the view is already scrolled to the bottom.
            at_end = (v_adj.value >= v_adj.upper - v_adj.page_size)

            buf = self.text_view.get_buffer()
            prev_end_mark = buf.create_mark(
                    None, buf.get_end_iter(), left_gravity=True)
            try:
                buf.insert(buf.get_end_iter(), new_output)
                # Highlight the new text.
                self.apply_highlighting(
                        buf.get_iter_at_mark(prev_end_mark),
                        buf.get_end_iter())
            except MemoryError:
                self.show_large_output_message(self.command_execution)
                return

            if at_end:
                # If we were already scrolled to the bottom, scroll back to the
                # bottom again. Also do it in an idle handler in case the added
                # text causes a scroll bar to appear and reflow the text,
                # making the text a bit taller.
                self.text_view.scroll_mark_onscreen(self.end_mark)
                gobject.idle_add(
                        lambda: self.text_view.scroll_mark_onscreen(
                            self.end_mark))
