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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
import threading
import uuid
import datetime
import selectors
import time
from .utils import get_logger
BUF_SIZE = 1024
logger = get_logger(__file__)
class Session:
def __init__(self, client, server, command_recorder=None, replay_recorder=None):
self.id = str(uuid.uuid4())
self.client = client # Master of the session, it's a client sock
self.server = server # Server channel
self._watchers = [] # Only watch session
self._sharers = [] # Join to the session, read and write
self.replaying = True
self.date_created = datetime.datetime.utcnow()
self.date_end = None
self.stop_evt = threading.Event()
self.sel = selectors.DefaultSelector()
self._command_recorder = command_recorder
self._replay_recorder = replay_recorder
self.server.set_session(self)
self.date_last_active = datetime.datetime.utcnow()
def add_watcher(self, watcher, silent=False):
"""
Add a watcher, and will be transport server side msg to it.
:param watcher: A client socket
:param silent: If true not send welcome message
:return:
"""
logger.info("Session add watcher: {} -> {} ".format(self.id, watcher))
if not silent:
watcher.send("Welcome to watch session {}\r\n".format(self.id).encode())
self.sel.register(watcher, selectors.EVENT_READ)
self._watchers.append(watcher)
def remove_watcher(self, watcher):
logger.info("Session %s remove watcher %s" % (self.id, watcher))
self.sel.unregister(watcher)
self._watchers.remove(watcher)
def add_sharer(self, sharer, silent=False):
"""
Add a sharer, it can read and write to server
:param sharer: A client socket
:param silent: If true not send welcome message
:return:
"""
logger.info("Session %s add share %s" % (self.id, sharer))
if not silent:
sharer.send("Welcome to join session: {}\r\n"
.format(self.id).encode("utf-8"))
self.sel.register(sharer, selectors.EVENT_READ)
self._sharers.append(sharer)
def remove_sharer(self, sharer):
logger.info("Session %s remove sharer %s" % (self.id, sharer))
sharer.send("Leave session {} at {}"
.format(self.id, datetime.datetime.now())
.encode("utf-8"))
self.sel.unregister(sharer)
self._sharers.remove(sharer)
def set_command_recorder(self, recorder):
self._command_recorder = recorder
def set_replay_recorder(self, recorder):
self._replay_recorder = recorder
def put_command(self, _input, _output):
if not _input:
return
self._command_recorder.record({
"session": self.id,
"input": _input,
"output": _output,
"user": self.client.user.username,
"asset": self.server.asset.hostname,
"system_user": self.server.system_user.username,
"timestamp": time.time(),
})
def put_replay(self, data):
self._replay_recorder.record({
"session": self.id,
"data": data,
"timestamp": time.time(),
})
def pre_bridge(self):
self._replay_recorder.session_start(self.id)
self._command_recorder.session_start(self.id)
def post_bridge(self):
self._replay_recorder.session_end(self.id)
self._command_recorder.session_end(self.id)
def terminate(self):
msg = b"Terminate by administrator\r\n"
try:
self.client.send(msg)
except OSError:
pass
self.close()
def bridge(self):
"""
Bridge clients with server
:return:
"""
logger.info("Start bridge session: {}".format(self.id))
self.pre_bridge()
self.sel.register(self.client, selectors.EVENT_READ)
self.sel.register(self.server, selectors.EVENT_READ)
while not self.stop_evt.is_set():
events = self.sel.select()
for sock in [key.fileobj for key, _ in events]:
data = sock.recv(BUF_SIZE)
# self.put_replay(data)
if sock == self.server:
if len(data) == 0:
msg = "Server close the connection"
logger.info(msg)
self.close()
break
self.date_last_active = datetime.datetime.utcnow()
for watcher in [self.client] + self._watchers + self._sharers:
watcher.send(data)
elif sock == self.client:
if len(data) == 0:
msg = "Client close the connection: {}".format(self.client)
logger.info(msg)
for watcher in self._watchers + self._sharers:
watcher.send(msg.encode("utf-8"))
self.close()
break
self.server.send(data)
elif sock in self._sharers:
if len(data) == 0:
logger.info("Sharer {} leave the session {}".format(sock, self.id))
self.remove_sharer(sock)
self.server.send(data)
elif sock in self._watchers:
if len(data) == 0:
self._watchers.remove(sock)
logger.info("Watcher {} leave the session {}".format(sock, self.id))
logger.info("Session stop event set: {}".format(self.id))
def set_size(self, width, height):
logger.debug("Resize server chan size {}*{}".format(width, height))
self.server.resize_pty(width=width, height=height)
def close(self):
logger.info("Close the session: {} ".format(self.id))
self.stop_evt.set()
self.post_bridge()
self.date_end = datetime.datetime.utcnow()
self.server.close()
def to_json(self):
return {
"id": self.id,
"user": self.client.user.username,
"asset": self.server.asset.hostname,
"system_user": self.server.system_user.username,
"login_from": "ST",
"remote_addr": self.client.addr[0],
"is_finished": True if self.stop_evt.is_set() else False,
"date_last_active": self.date_last_active.strftime("%Y-%m-%d %H:%M:%S") + " +0000",
"date_start": self.date_created.strftime("%Y-%m-%d %H:%M:%S") + " +0000",
"date_end": self.date_end.strftime("%Y-%m-%d %H:%M:%S") + " +0000" if self.date_end else None
}
def __str__(self):
return self.id
def __repr__(self):
return self.id
# def __del__(self):
# print("GC: Session object has been GC")