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import os
import random
import secrets
import signal
import string
import threading
import psutil
import requests
from werkzeug.serving import make_server
import port_for
from flask import Flask, abort, request
from vnc import run_vnc, save_password
API_SERVER = "http://127.0.0.1:8000"
BASE_URL = API_SERVER + "/app/rwa/api/"
REGISTER_URL = BASE_URL + "register/"
STOP_URL = BASE_URL + "stop/"
STATUS_URL = BASE_URL + "status/"
def random_digits(length: int):
return "".join(random.choice(string.digits) for _ in range(length))
class ServerThread(threading.Thread):
def __init__(self, app, port: int):
super().__init__()
self.srv = make_server("127.0.0.1", port, app)
self.ctx = app.app_context()
self.ctx.push()
def run(self):
self.srv.serve_forever()
def shutdown(self):
self.srv.shutdown()
class Session:
#: Session is running
STATUS_RUNNING = "running"
#: Remote has joined the session
STATUS_JOINED = "active"
def __init__(self, mockup_session: bool):
self.mockup_session = mockup_session
self._generate_password()
self._start_vnc()
self._start_trigger_service()
self._register_session()
self.status_text = self.STATUS_RUNNING
@property
def pid(self) -> int:
return self.vnc_pid
@property
def port(self) -> int:
return self.ws_port
@property
def _api_headers(self) -> dict:
return {"Authorization": f"Token {self.api_token}"}
def _generate_password(self):
"""Generate password for x11vnc and save it."""
self.password = secrets.token_urlsafe(20)
# Don't actually save a password if we just pretend to be a session.
if not self.mockup_session:
self.pw_filename = save_password(self.password)
def _start_vnc(self):
"""Start x11vnc server if not in mockup_session mode."""
if not self.mockup_session:
process_info = run_vnc(self.pw_filename)
self.vnc_pid = process_info["vnc"]["pid"]
self.vnc_port = process_info["vnc"]["port"]
self.ws_pid = process_info["ws"]["pid"]
self.ws_port = process_info["ws"]["port"]
else:
self.ws_port = port_for.select_random()
self.vnc_port = port_for.select_random()
# Use negative values to ensure we don't do something harmful
# to random processes
self.ws_pid = int("-" + random_digits(5))
self.vnc_pid = int("-" + random_digits(5))
# Create a temporary file to indicate that this process is still 'Running'
filename = f"/tmp/rwa/{str(self.ws_port) + str(self.vnc_port) + str(self.ws_pid) + str(self.vnc_pid)}.lock"
new_file = open(filename, "w")
new_file.write("this session is running")
def _register_session(self):
"""Register session in RWA if not in mockup_session mode."""
if not self.mockup_session:
r = requests.post(
REGISTER_URL,
json={
"port": self.ws_port,
"password": self.password,
"pid": self.vnc_pid,
"trigger_port": self.trigger_port,
"trigger_token": self.trigger_token,
},
)
print(r)
self.meta = r.json()
self.session_id = self.meta["session_id"]
self.web_url = self.meta["url"]
self.api_token = self.meta["token"]
self.pin = self.meta["pin"]
else:
print('"Registered" in RWA')
self.meta = {}
self.session_id = int(random_digits(10))
self.web_url = "testhostname:" + random_digits(5) + "/RWA/test/"
self.api_token = secrets.token_urlsafe(10)
self.pin = int(random_digits(5))
def _start_trigger_service(self):
self.trigger_port = port_for.select_random()
self.trigger_token = secrets.token_urlsafe(20)
app = Flask(__name__)
@app.route("/", methods=["POST"])
def trigger():
json = request.json
if json.get("token", "") == self.trigger_token:
self._trigger()
return "Successful triggered"
else:
return abort(403)
self.trigger_thread = ServerThread(app=app, port=self.trigger_port)
self.trigger_thread.start()
def _trigger(self):
"""Event triggered by Django."""
print("Triggered")
self.pull()
def pull(self):
"""Update status: Get status from Django."""
if not self.mockup_session:
r = requests.get(
STATUS_URL, params={"id": self.session_id}, headers=self._api_headers
)
self.status_text = r.json()["status"]
def push(self):
"""Update status: Push status to Django."""
pass
def stop(self, triggered: bool = False):
"""Stop session and clean up."""
if self.mockup_session:
filename = f"/tmp/rwa/{str(self.ws_port) + str(self.vnc_port) + str(self.ws_pid) + str(self.vnc_pid)}.lock"
if os.path.isfile(filename):
os.remove(filename)
# Delete self
del self
return
# Kill VNC
if self.vnc_pid in psutil.pids():
print("Kill VNC.")
os.kill(self.vnc_pid, signal.SIGTERM)
# Kill websockify
if self.ws_pid in psutil.pids():
print("Kill websockify.")
os.kill(self.ws_pid, signal.SIGTERM)
# Delete PW file
if os.path.exists(self.pw_filename):
print("Delete password file")
os.remove(self.pw_filename)
if hasattr(self, "trigger_thread"):
print("Kill trigger service.")
self.trigger_thread.shutdown()
self.push()
if not triggered:
requests.post(
STOP_URL, params={"id": self.session_id}, headers=self._api_headers
)
# Delete self
del self
@property
def vnc_process_running(self):
"""Check if the VNC process is still running."""
if self.mockup_session:
filename = f"/tmp/rwa/{str(self.ws_port) + str(self.vnc_port) + str(self.ws_pid) + str(self.vnc_pid)}.lock"
return os.path.isfile(filename)
if self.vnc_pid in psutil.pids():
p = psutil.Process(self.vnc_pid)
if p.status() == "zombie":
return False
return True
return False
@property
def client_meta(self):
return {"id": self.pid, "url": self.web_url, "pin": self.pin}
@property
def status(self):
return {"id": self.pid, "status": self.status_text}
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