129 lines
4.3 KiB
Python
129 lines
4.3 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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import subprocess as sp
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from app.utils import terminate_process, read_config
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from os import mkdir, path
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from flask import send_file, jsonify
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import datetime
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import shutil
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import json
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import random
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import sys
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import re
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class Capture(object):
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def __init__(self):
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self.random_choice_alphabet = "ABCDEF1234567890"
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def start_capture(self):
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"""
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Start a tshark capture on the created AP interface and save
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it in a temporary directory under /tmp/.
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:return: dict containing capture token and status.
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"""
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# Kill potential tshark zombies instances, if any.
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terminate_process("tshark")
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# Few context variable assignment
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self.capture_token = "".join(
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[random.choice(self.random_choice_alphabet) for i in range(8)])
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self.capture_dir = "/tmp/{}/".format(self.capture_token)
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self.assets_dir = "/tmp/{}/assets/".format(self.capture_token)
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self.pcap = self.capture_dir + "capture.pcap"
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self.iface = read_config(("network", "in"))
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# For packets monitoring
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self.list_pkts = []
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self.last_pkts = 0
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# Make the capture and the assets directory
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mkdir(self.capture_dir)
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mkdir(self.assets_dir)
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try:
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sp.Popen(["tshark", "-i", self.iface, "-w",
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self.pcap, "-f", "tcp or udp"])
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return {"status": True,
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"message": "Capture started",
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"capture_token": self.capture_token}
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except:
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return {"status": False,
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"message": "Unexpected error: %s" % sys.exc_info()[0]}
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def get_capture_stats(self):
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"""
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Get some dirty capture statistics in order to have a sparkline
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in the background of capture view.
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:return: dict containing stats associated to the capture
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"""
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with open("/sys/class/net/{}/statistics/tx_packets".format(self.iface)) as f:
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tx_pkts = int(f.read())
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with open("/sys/class/net/{}/statistics/rx_packets".format(self.iface)) as f:
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rx_pkts = int(f.read())
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if self.last_pkts == 0:
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self.last_pkts = tx_pkts + rx_pkts
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return {"status": True,
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"packets": [0*400]}
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else:
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curr_pkts = (tx_pkts + rx_pkts) - self.last_pkts
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self.last_pkts = tx_pkts + rx_pkts
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self.list_pkts.append(curr_pkts)
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return {"status": True,
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"packets": self.beautify_stats(self.list_pkts)}
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@staticmethod
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def beautify_stats(data):
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"""
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Add 0 at the end of the array if the len of the array is less
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than max_len. Else, get the last 100 stats. This allows to
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show a kind of "progressive chart" in the background for
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the first packets.
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:return: a list of integers.
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"""
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max_len = 400
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if len(data) >= max_len:
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return data[-max_len:]
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else:
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return data + [1] * (max_len - len(data))
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def stop_capture(self):
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"""
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Stop tshark if any instance present & ask create_capinfos.
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:return: dict as a small confirmation.
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"""
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if terminate_process("tshark"):
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self.create_capinfos()
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return {"status": True,
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"message": "Capture stopped"}
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else:
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return {"status": False,
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"message": "No active capture"}
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def create_capinfos(self):
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"""
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Creates a capinfo json file.
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:return: dict as a small confirmation.
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"""
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infos = sp.Popen(["capinfos", self.pcap],
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stdout=sp.PIPE, stderr=sp.PIPE)
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infos = infos.communicate()[0]
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data = {}
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for l in infos.decode().splitlines():
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try:
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l = l.split(": ") if ": " in l else l.split("= ")
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if len(l[0]) and len(l[1]):
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data[l[0].strip()] = l[1].strip()
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except:
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continue
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with open("{}capinfos.json".format(self.assets_dir), 'w') as f:
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json.dump(data, f)
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return True
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