add trabalho5
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import socket
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import select
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from threading import Thread
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import time
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import logging
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import logging.handlers
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LOGGER_HOST = "localhost"
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LOGGER_PORT = 514
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CURRENT_THREADS = 0
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MAX_THREADS = 10
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BACKLOG = 50
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class Logger:
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_instance = None
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def __init__(self):
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self.logger = logging.getLogger('PythonProxy')
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self.logger.setLevel(logging.DEBUG)
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handler = logging.handlers.SysLogHandler(address = (LOGGER_HOST, LOGGER_PORT))
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self.logger.addHandler(handler)
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self.logger.debug('Initiating Proxy logger!')
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def log(self, message:str):
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self.logger.debug(message)
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print('INFO:', message)
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def critical(self, message:str):
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self.logger.critical(message)
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print('CRITICAL:', message)
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def __del__(self):
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self.logger.close()
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@classmethod
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def instance(self):
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if self._instance is None:
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self._instance = self()
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return self._instance
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class Server:
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def __init__(self, host:str, port:int):
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.sock.bind((host, port))
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self.sock.listen(BACKLOG)
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print(f"Listening at: http://{host}:{port}")
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def thread_check(self):
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global CURRENT_THREADS, MAX_THREADS
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while True:
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if CURRENT_THREADS >= MAX_THREADS:
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time.sleep(1)
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else:
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return
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def start(self):
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global CURRENT_THREADS
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while True:
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conn, client_addr = self.sock.accept()
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self.thread_check()
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CURRENT_THREADS += 1
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thread = Thread(target = connectionHandle, args = (conn, client_addr, ))
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CURRENT_THREADS -= 1
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thread.start()
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def __del__(self):
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self.sock.close()
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def connectionHandle(client_socket, client_address):
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# print(f"Connection received from {client_address[0]}:{client_address[1]}")
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request = client_socket.recv(16 * 1024)
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logger = Logger.instance()
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if len(request) == 0:
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client_socket.close()
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return
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try:
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raw_request = request.decode()
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except UnicodeDecodeError:
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print("UnicodeDecodeError")
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client_socket.close()
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return
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if "CONNECT" in raw_request:
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client_socket.sendall(b"HTTP/1.1 200 Connection Established\r\n\r\n")
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request = client_socket.recv(16 * 1024)
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request_url = raw_request.split(' ')[1]
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request_host = ""
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request_port = 443 if 'https' in request_url else 80
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if request_url.startswith('http'):
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request_host = request_url.split('/')[2]
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else:
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request_host = request_url.split('/')[0]
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if request_host.startswith('www'):
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request_host = request_host[4:]
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if ':' in request_host:
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request_port = int(request_host.split(':')[1])
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request_host = request_host.split(':')[0]
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# print(f"REQUEST [{client_address[0]}:{client_address[1]}] {raw_request}")
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if "monitorando" in request_url:
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body = "<HTML><HEAD><TITLE>403</TITLE><meta charset=\"UTF-8\"></HEAD> <BODY>Acesso não autorizado!</BODY> </HTML>"
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client_socket.sendall(b"HTTP/1.1 403 Forbidden\r\n\r\n")
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client_socket.sendall(body.encode())
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client_socket.close()
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return
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# forward the request to the destination server
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# print(f"Forwarding request to {request_host}:{request_port}")
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destination_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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destination_socket.connect((request_host, request_port))
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destination_socket.sendall(request)
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# print(f"Waiting for response from {request_host}:{request_port}")
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while True:
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triple = select.select([client_socket, destination_socket], [], [], 20)[0]
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if not len(triple):
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break
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try:
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if client_socket in triple:
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data = client_socket.recv(16 * 1024)
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if not data:
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break
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destination_socket.send(data)
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if destination_socket in triple:
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data = destination_socket.recv(16 * 1024)
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if not data:
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break
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try:
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status_code = data.decode().split(' ')[1:]
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status_code = ' '.join(status_code)
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logger.log(f"REQUEST [{client_address[0]}:{client_address[1]}] to [{request_host}:{request_port}] - {status_code} ({len(data)} bytes)")
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except UnicodeDecodeError:
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pass
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client_socket.send(data)
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except ConnectionAbortedError:
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break
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# print(f"Closing connection with {request_host}:{request_port} and {client_address[0]}:{client_address[1]}")
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# close the sockets
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destination_socket.close()
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client_socket.close()
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# print("Connection closed")
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if __name__ == '__main__':
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ser = Server(host="0.0.0.0", port=8080)
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ser.start()
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