glances.plugins.ports.PluginModel.get_ports_alert() - Code Metrics - Inspection of "version 4.2.0" - nicolargo/glances - Measure and Improve Code Quality continuously with Scrutinizer

Test Failed

Push — master ( cc9054...a8608f )

by Nicolas

created 2024-10-20 16:02 UTC

PluginModel.get_ports_alert() A

↳ Parent: glances.plugins.ports

Complexity

Conditions

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	2
nop	4
dl	0
loc	4
rs	10
c	0
b	0
f	0

#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <[email protected]>
#
# SPDX-License-Identifier: LGPL-3.0-only
#

"""Ports scanner plugin."""

import numbers
import os
import socket
import subprocess
import threading
import time
from functools import partial, reduce

from glances.globals import BSD, MACOS, WINDOWS, bool_type
from glances.logger import logger
from glances.plugins.plugin.model import GlancesPluginModel
from glances.ports_list import GlancesPortsList
from glances.timer import Counter
from glances.web_list import GlancesWebList

try:
    import requests

    requests_tag = True
except ImportError as e:
    requests_tag = False
    logger.warning(f"Missing Python Lib ({e}), Ports plugin is limited to port scanning")

# Fields description
# description: human readable description
# short_name: shortname to use un UI
# unit: unit type
# rate: is it a rate ? If yes, // by time_since_update when displayed,
# min_symbol: Auto unit should be used if value > than 1 'X' (K, M, G)...
fields_description = {
    'host': {
        'description': 'Measurement is be done on this host (or IP address)',
    },
    'port': {
        'description': 'Measurement is be done on this port (0 for ICMP)',
    },
    'description': {
        'description': 'Human readable description for the host/port',
    },
    'refresh': {
        'description': 'Refresh time (in seconds) for this host/port',
    },
    'timeout': {
        'description': 'Timeout (in seconds) for the measurement',
    },
    'status': {
        'description': 'Measurement result (in seconds)',
        'unit': 'second',
    },
    'rtt_warning': {
        'description': 'Warning threshold (in seconds) for the measurement',
        'unit': 'second',
    },
    'indice': {
        'description': 'Unique indice for the host/port',
    },
}


class PluginModel(GlancesPluginModel):
    """Glances ports scanner plugin."""

    def __init__(self, args=None, config=None):
        """Init the plugin."""
        super().__init__(args=args, config=config, stats_init_value=[], fields_description=fields_description)
        self.args = args
        self.config = config

        # We want to display the stat in the curse interface
        self.display_curse = True

        # Init stats
        self.stats = (
            GlancesPortsList(config=config, args=args).get_ports_list()
            + GlancesWebList(config=config, args=args).get_web_list()
        )

        # Global Thread running all the scans
        self._thread = None

    def exit(self):
        """Overwrite the exit method to close threads."""
        if self._thread is not None:
            self._thread.stop()
        # Call the father class
        super().exit()

    def get_key(self):
        """Return the key of the list."""
        return 'indice'

    @GlancesPluginModel._check_decorator
    @GlancesPluginModel._log_result_decorator
    def update(self):
        """Update the ports list."""
        if self.input_method == 'local':
            # Only refresh:
            # * if there is not other scanning thread
            # * every refresh seconds (define in the configuration file)
            if self._thread is None:
                thread_is_running = False
            else:
                thread_is_running = self._thread.is_alive()
            if not thread_is_running:
                # Run ports scanner
                self._thread = ThreadScanner(self.stats)
                self._thread.start()
        else:
            # Not available in SNMP mode
            self.stats = None

        return self.stats

    def get_conds_if_port(self, port):
        return {
            'CAREFUL': port['status'] is None,
            'CRITICAL': port['status'] == 0,
            'WARNING': isinstance(port['status'], (float, int))
            and port['rtt_warning'] is not None
            and port['status'] > port['rtt_warning'],
        }

    def get_ports_alert(self, port, header="", log=False):
        """Return the alert status relative to the port scan return value."""

        return self.get_p_alert(self.get_conds_if_port(port), port, header, log)

    def get_conds_if_url(self, web):
        return {
            'CAREFUL': web['status'] is None,
            'CRITICAL': web['status'] not in [200, 301, 302],
            'WARNING': web['rtt_warning'] is not None and web['elapsed'] > web['rtt_warning'],
        }

    def get_web_alert(self, web, header="", log=False):
        """Return the alert status relative to the web/url scan return value."""

        return self.get_p_alert(self.get_conds_if_url(web), web, header, log)

    def get_p_alert(self, conds, p, header="", log=False):
        ret = self.get_default_ret_value(conds)

        # Get stat name
        stat_name = self.get_stat_name(header=header)

        # Manage threshold
        self.manage_threshold(stat_name, ret)

        # Manage action
        self.manage_action(stat_name, ret.lower(), header, p[self.get_key()])

        return ret

    def get_default_ret_value(self, conds):
        ret_as_dict_val = {'ret': key for key, cond in conds.items() if cond}

        return ret_as_dict_val.get('ret', 'OK')

    def set_status_if_host(self, p):
        if p['host'] is None:
            status = 'None'
        elif p['status'] is None:
            status = 'Scanning'
        elif isinstance(p['status'], bool_type) and p['status'] is True:
            status = 'Open'
        elif p['status'] == 0:
            status = 'Timeout'
        else:
            # Convert second to ms
            status = '{:.0f}ms'.format(p['status'] * 1000.0)

        return status

    def set_status_if_url(self, p):
        if isinstance(p['status'], numbers.Number):
            status = 'Code {}'.format(p['status'])
        elif p['status'] is None:
            status = 'Scanning'
        else:
            status = p['status']

        return status

    def build_str(self, name_max_width, ret, p):
        helper, status = self.get_status_and_helper(p).get(True)
        msg = '{:{width}}'.format(p['description'][0:name_max_width], width=name_max_width)
        ret.append(self.curse_add_line(msg))
        msg = f'{status:>9}'
        ret.append(self.curse_add_line(msg, helper(p, header=p['indice'] + '_rtt')))
        ret.append(self.curse_new_line())

        return ret

    def get_status_and_helper(self, p):
        return {
            'host' in p: (self.get_ports_alert, self.set_status_if_host(p)),
            'url' in p: (self.get_web_alert, self.set_status_if_url(p)),
        }

    def msg_curse(self, args=None, max_width=None):
        """Return the dict to display in the curse interface."""
        # Init the return message
        # Only process if stats exist and display plugin enable...
        init = []

        if not self.stats or args.disable_ports:
            return init

        # Max size for the interface name
        if max_width:
            name_max_width = max_width - 7
        else:
            # No max_width defined, return an empty curse message
            logger.debug(f"No max_width defined for the {self.plugin_name} plugin, it will not be displayed.")
            return init

        # Build the string message
        build_str_with_this_max_width = partial(self.build_str, name_max_width)
        ret = reduce(build_str_with_this_max_width, self.stats, init)

        # Delete the last empty line
        try:
            ret.pop()
        except IndexError:
            pass

        return ret


class ThreadScanner(threading.Thread):
    """
    Specific thread for the port/web scanner.

    stats is a list of dict
    """

    def __init__(self, stats):
        """Init the class."""
        logger.debug(f"ports plugin - Create thread for scan list {stats}")
        super().__init__()
        # Event needed to stop properly the thread
        self._stopper = threading.Event()
        # The class return the stats as a list of dict
        self._stats = stats
        # Is part of Ports plugin
        self.plugin_name = "ports"

    def get_key(self):
        """Return the key of the list."""
        return 'indice'

    def run(self):
        """Grab the stats.

        Infinite loop, should be stopped by calling the stop() method.
        """
        for p in self._stats:
            # End of the thread has been asked
            if self.stopped():
                break
            # Scan a port (ICMP or TCP)
            if 'port' in p:
                self._port_scan(p)
                # Had to wait between two scans
                # If not, result are not ok
                time.sleep(1)
            # Scan an URL
            elif 'url' in p and requests_tag:
                self._web_scan(p)
            # Add the key for every element
            p['key'] = self.get_key()

    @property
    def stats(self):
        """Stats getter."""
        return self._stats

    @stats.setter
    def stats(self, value):
        """Stats setter."""
        self._stats = value

    def stop(self, timeout=None):
        """Stop the thread."""
        logger.debug(f"ports plugin - Close thread for scan list {self._stats}")
        self._stopper.set()

    def stopped(self):
        """Return True is the thread is stopped."""
        return self._stopper.is_set()

    def _web_scan(self, web):
        """Scan the  Web/URL (dict) and update the status key."""
        try:
            req = requests.head(
                web['url'],
                allow_redirects=True,
                verify=web['ssl_verify'],
                proxies=web['proxies'],
                timeout=web['timeout'],
            )
        except Exception as e:
            logger.debug(e)
            web['status'] = 'Error'
            web['elapsed'] = 0
        else:
            web['status'] = req.status_code
            web['elapsed'] = req.elapsed.total_seconds()
        return web

    def _port_scan(self, port):
        """Scan the port structure (dict) and update the status key."""
        if int(port['port']) == 0:
            return self._port_scan_icmp(port)
        return self._port_scan_tcp(port)

    def _resolv_name(self, hostname):
        """Convert hostname to IP address."""
        ip = hostname
        try:
            ip = socket.gethostbyname(hostname)
        except Exception as e:
            logger.debug(f"{self.plugin_name}: Cannot convert {hostname} to IP address ({e})")
        return ip

    def _port_scan_icmp(self, port):
        """Scan the (ICMP) port structure (dict) and update the status key."""
        ret = None

        # Create the ping command
        # Use the system ping command because it already have the sticky bit set
        # Python can not create ICMP packet with non root right
        if WINDOWS:
            timeout_opt = '-w'
            count_opt = '-n'
        elif MACOS or BSD:
            timeout_opt = '-t'
            count_opt = '-c'
        else:
            # Linux and co...
            timeout_opt = '-W'
            count_opt = '-c'
        # Build the command line
        # Note: Only string are allowed
        cmd = [
            'ping',
            count_opt,
            '1',
            timeout_opt,
            str(self._resolv_name(port['timeout'])),
            self._resolv_name(port['host']),
        ]
        fnull = open(os.devnull, 'w')

        try:
            counter = Counter()
            ret = subprocess.check_call(cmd, stdout=fnull, stderr=fnull, close_fds=True)
            if ret == 0:
                port['status'] = counter.get()
            else:
                port['status'] = False
        except subprocess.CalledProcessError:
            # Correct issue #1084: No Offline status for timed-out ports
            port['status'] = False
        except Exception as e:
            logger.debug("{}: Error while pinging host {} ({})".format(self.plugin_name, port['host'], e))

        fnull.close()

        return ret

    def _port_scan_tcp(self, port):
        """Scan the (TCP) port structure (dict) and update the status key."""
        ret = None

        # Create and configure the scanning socket
        try:
            socket.setdefaulttimeout(port['timeout'])
            _socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        except Exception as e:
            logger.debug(f"{self.plugin_name}: Error while creating scanning socket ({e})")

        # Scan port
        ip = self._resolv_name(port['host'])
        counter = Counter()
        try:
            ret = _socket.connect_ex((ip, int(port['port'])))

        except Exception as e:
            logger.debug(f"{self.plugin_name}: Error while scanning port {port} ({e})")
        else:
            if ret == 0:
                port['status'] = counter.get()
            else:
                port['status'] = False
        finally:
            _socket.close()

        return ret


1			#
2			# This file is part of Glances.
3			#
4			# SPDX-FileCopyrightText: 2022 Nicolas Hennion <[email protected]>
5			#
6			# SPDX-License-Identifier: LGPL-3.0-only
7			#
8
9			"""Ports scanner plugin."""
10
11			import numbers
12			import os
13			import socket
14			import subprocess
15			import threading
16			import time
17			from functools import partial, reduce
18
19			from glances.globals import BSD, MACOS, WINDOWS, bool_type
20			from glances.logger import logger
21			from glances.plugins.plugin.model import GlancesPluginModel
22			from glances.ports_list import GlancesPortsList
23			from glances.timer import Counter
24			from glances.web_list import GlancesWebList
25
26			try:
27			import requests
28
29			requests_tag = True
30			except ImportError as e:
31			requests_tag = False
32			logger.warning(f"Missing Python Lib ({e}), Ports plugin is limited to port scanning")
33
34			# Fields description
35			# description: human readable description
36			# short_name: shortname to use un UI
37			# unit: unit type
38			# rate: is it a rate ? If yes, // by time_since_update when displayed,
39			# min_symbol: Auto unit should be used if value > than 1 'X' (K, M, G)...
40			fields_description = {
41			'host': {
42			'description': 'Measurement is be done on this host (or IP address)',
43			},
44			'port': {
45			'description': 'Measurement is be done on this port (0 for ICMP)',
46			},
47			'description': {
48			'description': 'Human readable description for the host/port',
49			},
50			'refresh': {
51			'description': 'Refresh time (in seconds) for this host/port',
52			},
53			'timeout': {
54			'description': 'Timeout (in seconds) for the measurement',
55			},
56			'status': {
57			'description': 'Measurement result (in seconds)',
58			'unit': 'second',
59			},
60			'rtt_warning': {
61			'description': 'Warning threshold (in seconds) for the measurement',
62			'unit': 'second',
63			},
64			'indice': {
65			'description': 'Unique indice for the host/port',
66			},
67			}
68
69
70			class PluginModel(GlancesPluginModel):
71			"""Glances ports scanner plugin."""
72
73			def __init__(self, args=None, config=None):
74			"""Init the plugin."""
75			super().__init__(args=args, config=config, stats_init_value=[], fields_description=fields_description)
76			self.args = args
77			self.config = config
78
79			# We want to display the stat in the curse interface
80			self.display_curse = True
81
82			# Init stats
83			self.stats = (
84			GlancesPortsList(config=config, args=args).get_ports_list()
85			+ GlancesWebList(config=config, args=args).get_web_list()
86			)
87
88			# Global Thread running all the scans
89			self._thread = None
90
91			def exit(self):
92			"""Overwrite the exit method to close threads."""
93			if self._thread is not None:
94			self._thread.stop()
95			# Call the father class
96			super().exit()
97
98			def get_key(self):
99			"""Return the key of the list."""
100			return 'indice'
101
102			@GlancesPluginModel._check_decorator
103			@GlancesPluginModel._log_result_decorator
104			def update(self):
105			"""Update the ports list."""
106			if self.input_method == 'local':
107			# Only refresh:
108			# * if there is not other scanning thread
109			# * every refresh seconds (define in the configuration file)
110			if self._thread is None:
111			thread_is_running = False
112			else:
113			thread_is_running = self._thread.is_alive()
114			if not thread_is_running:
115			# Run ports scanner
116			self._thread = ThreadScanner(self.stats)
117			self._thread.start()
118			else:
119			# Not available in SNMP mode
120			self.stats = None
121
122			return self.stats
123
124			def get_conds_if_port(self, port):
125			return {
126			'CAREFUL': port['status'] is None,
127			'CRITICAL': port['status'] == 0,
128			'WARNING': isinstance(port['status'], (float, int))
129			and port['rtt_warning'] is not None
130			and port['status'] > port['rtt_warning'],
131			}
132
133			def get_ports_alert(self, port, header="", log=False):
134			"""Return the alert status relative to the port scan return value."""
135
136			return self.get_p_alert(self.get_conds_if_port(port), port, header, log)
137
138			def get_conds_if_url(self, web):
139			return {
140			'CAREFUL': web['status'] is None,
141			'CRITICAL': web['status'] not in [200, 301, 302],
142			'WARNING': web['rtt_warning'] is not None and web['elapsed'] > web['rtt_warning'],
143			}
144
145			def get_web_alert(self, web, header="", log=False):
146			"""Return the alert status relative to the web/url scan return value."""
147
148			return self.get_p_alert(self.get_conds_if_url(web), web, header, log)
149
150			def get_p_alert(self, conds, p, header="", log=False):
151			ret = self.get_default_ret_value(conds)
152
153			# Get stat name
154			stat_name = self.get_stat_name(header=header)
155
156			# Manage threshold
157			self.manage_threshold(stat_name, ret)
158
159			# Manage action
160			self.manage_action(stat_name, ret.lower(), header, p[self.get_key()])
161
162			return ret
163
164			def get_default_ret_value(self, conds):
165			ret_as_dict_val = {'ret': key for key, cond in conds.items() if cond}
166
167			return ret_as_dict_val.get('ret', 'OK')
168
169			def set_status_if_host(self, p):
170			if p['host'] is None:
171			status = 'None'
172			elif p['status'] is None:
173			status = 'Scanning'
174			elif isinstance(p['status'], bool_type) and p['status'] is True:
175			status = 'Open'
176			elif p['status'] == 0:
177			status = 'Timeout'
178			else:
179			# Convert second to ms
180			status = '{:.0f}ms'.format(p['status'] * 1000.0)
181
182			return status
183
184			def set_status_if_url(self, p):
185			if isinstance(p['status'], numbers.Number):
186			status = 'Code {}'.format(p['status'])
187			elif p['status'] is None:
188			status = 'Scanning'
189			else:
190			status = p['status']
191
192			return status
193
194			def build_str(self, name_max_width, ret, p):
195			helper, status = self.get_status_and_helper(p).get(True)
196			msg = '{:{width}}'.format(p['description'][0:name_max_width], width=name_max_width)
197			ret.append(self.curse_add_line(msg))
198			msg = f'{status:>9}'
199			ret.append(self.curse_add_line(msg, helper(p, header=p['indice'] + '_rtt')))
200			ret.append(self.curse_new_line())
201
202			return ret
203
204			def get_status_and_helper(self, p):
205			return {
206			'host' in p: (self.get_ports_alert, self.set_status_if_host(p)),
207			'url' in p: (self.get_web_alert, self.set_status_if_url(p)),
208			}
209
210			def msg_curse(self, args=None, max_width=None):
211			"""Return the dict to display in the curse interface."""
212			# Init the return message
213			# Only process if stats exist and display plugin enable...
214			init = []
215
216			if not self.stats or args.disable_ports:
217			return init
218
219			# Max size for the interface name
220			if max_width:
221			name_max_width = max_width - 7
222			else:
223			# No max_width defined, return an empty curse message
224			logger.debug(f"No max_width defined for the {self.plugin_name} plugin, it will not be displayed.")
225			return init
226
227			# Build the string message
228			build_str_with_this_max_width = partial(self.build_str, name_max_width)
229			ret = reduce(build_str_with_this_max_width, self.stats, init)
230
231			# Delete the last empty line
232			try:
233			ret.pop()
234			except IndexError:
235			pass
236
237			return ret
238
239
240			class ThreadScanner(threading.Thread):
241			"""
242			Specific thread for the port/web scanner.
243
244			stats is a list of dict
245			"""
246
247			def __init__(self, stats):
248			"""Init the class."""
249			logger.debug(f"ports plugin - Create thread for scan list {stats}")
250			super().__init__()
251			# Event needed to stop properly the thread
252			self._stopper = threading.Event()
253			# The class return the stats as a list of dict
254			self._stats = stats
255			# Is part of Ports plugin
256			self.plugin_name = "ports"
257
258			def get_key(self):
259			"""Return the key of the list."""
260			return 'indice'
261
262			def run(self):
263			"""Grab the stats.
264
265			Infinite loop, should be stopped by calling the stop() method.
266			"""
267			for p in self._stats:
268			# End of the thread has been asked
269			if self.stopped():
270			break
271			# Scan a port (ICMP or TCP)
272			if 'port' in p:
273			self._port_scan(p)
274			# Had to wait between two scans
275			# If not, result are not ok
276			time.sleep(1)
277			# Scan an URL
278			elif 'url' in p and requests_tag:
279			self._web_scan(p)
280			# Add the key for every element
281			p['key'] = self.get_key()
282
283			@property
284			def stats(self):
285			"""Stats getter."""
286			return self._stats
287
288			@stats.setter
289			def stats(self, value):
290			"""Stats setter."""
291			self._stats = value
292
293			def stop(self, timeout=None):
294			"""Stop the thread."""
295			logger.debug(f"ports plugin - Close thread for scan list {self._stats}")
296			self._stopper.set()
297
298			def stopped(self):
299			"""Return True is the thread is stopped."""
300			return self._stopper.is_set()
301
302			def _web_scan(self, web):
303			"""Scan the Web/URL (dict) and update the status key."""
304			try:
305			req = requests.head(
306			web['url'],
307			allow_redirects=True,
308			verify=web['ssl_verify'],
309			proxies=web['proxies'],
310			timeout=web['timeout'],
311			)
312			except Exception as e:
313			logger.debug(e)
314			web['status'] = 'Error'
315			web['elapsed'] = 0
316			else:
317			web['status'] = req.status_code
318			web['elapsed'] = req.elapsed.total_seconds()
319			return web
320
321			def _port_scan(self, port):
322			"""Scan the port structure (dict) and update the status key."""
323			if int(port['port']) == 0:
324			return self._port_scan_icmp(port)
325			return self._port_scan_tcp(port)
326
327			def _resolv_name(self, hostname):
328			"""Convert hostname to IP address."""
329			ip = hostname
330			try:
331			ip = socket.gethostbyname(hostname)
332			except Exception as e:
333			logger.debug(f"{self.plugin_name}: Cannot convert {hostname} to IP address ({e})")
334			return ip
335
336			def _port_scan_icmp(self, port):
337			"""Scan the (ICMP) port structure (dict) and update the status key."""
338			ret = None
339
340			# Create the ping command
341			# Use the system ping command because it already have the sticky bit set
342			# Python can not create ICMP packet with non root right
343			if WINDOWS:
344			timeout_opt = '-w'
345			count_opt = '-n'
346			elif MACOS or BSD:
347			timeout_opt = '-t'
348			count_opt = '-c'
349			else:
350			# Linux and co...
351			timeout_opt = '-W'
352			count_opt = '-c'
353			# Build the command line
354			# Note: Only string are allowed
355			cmd = [
356			'ping',
357			count_opt,
358			'1',
359			timeout_opt,
360			str(self._resolv_name(port['timeout'])),
361			self._resolv_name(port['host']),
362			]
363			fnull = open(os.devnull, 'w')
364
365			try:
366			counter = Counter()
367			ret = subprocess.check_call(cmd, stdout=fnull, stderr=fnull, close_fds=True)
368			if ret == 0:
369			port['status'] = counter.get()
370			else:
371			port['status'] = False
372			except subprocess.CalledProcessError:
373			# Correct issue #1084: No Offline status for timed-out ports
374			port['status'] = False
375			except Exception as e:
376			logger.debug("{}: Error while pinging host {} ({})".format(self.plugin_name, port['host'], e))
377
378			fnull.close()
379
380			return ret
381
382			def _port_scan_tcp(self, port):
383			"""Scan the (TCP) port structure (dict) and update the status key."""
384			ret = None
385
386			# Create and configure the scanning socket
387			try:
388			socket.setdefaulttimeout(port['timeout'])
389			_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
390			except Exception as e:
391			logger.debug(f"{self.plugin_name}: Error while creating scanning socket ({e})")
392
393			# Scan port
394			ip = self._resolv_name(port['host'])
395			counter = Counter()
396			try:
397			ret = _socket.connect_ex((ip, int(port['port'])))
			0 ignored issues – show introduced 2018-11-11 15:28 UTC by Report Bug Copy Issue Report The variable `_socket` does not seem to be defined for all execution paths. Loading history...
398			except Exception as e:
399			logger.debug(f"{self.plugin_name}: Error while scanning port {port} ({e})")
400			else:
401			if ret == 0:
402			port['status'] = counter.get()
403			else:
404			port['status'] = False
405			finally:
406			_socket.close()
407
408			return ret
409

nicolargo / glances

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PluginModel.get_ports_alert() A

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