# # Copyright (C) 2020-2021 Soleta Networks # # This program is free software: you can redistribute it and/or modify it under # the terms of the GNU Affero General Public License as published by the # Free Software Foundation; either version 3 of the License, or # (at your option) any later version. import errno import select import socket import time import email import logging from io import StringIO from src.restRequest import * from src.ogRest import * from enum import Enum class State(Enum): CONNECTING = 0 RECEIVING = 1 FORCE_DISCONNECTED = 2 class ogClient: OG_PATH = '/opt/opengnsys/' def __init__(self, config): self.CONFIG = config self.mode = self.CONFIG['opengnsys']['mode'] if self.mode not in {'virtual', 'live', 'linux', 'windows'}: logging.critical('Invalid ogClient mode') raise ValueError('Mode not supported.') if self.mode in {'linux', 'windows', 'live'}: self.event_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) self.event_sock.setblocking(0) self.event_sock.bind(('127.0.0.1', 55885)) else: self.event_sock = None if self.CONFIG['samba']['activate']: assert('user' in self.CONFIG['samba']) assert('pass' in self.CONFIG['samba']) self.ip = self.CONFIG['opengnsys']['ip'] self.port = self.CONFIG['opengnsys']['port'] self.ogrest = ogRest(self.CONFIG) self.seq = None def get_socket(self): return self.sock def get_event_socket(self): return self.event_sock def get_state(self): return self.state def send_event_hint(self, message): try: event, action, user = message.split(" ") logging.debug('Sending event: %s, %s, %s', event, action, user) except: logging.warning('Error parsing session datagram') return if (event != "session" or action not in ['start', 'stop'] or not user): logging.warning('Invalid value in session datagram: %s', message) payload = jsonBody({'event': event, 'action': action, 'user': user}) response = restResponse(ogResponses.EARLY_HINTS, payload) self.send(response.get()) logging.debug('Sending event OK') def cleanup(self): self.data = "" self.content_len = 0 self.header_len = 0 self.trailer = False def connect(self): logging.debug('Connecting...') self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) self.sock.setblocking(0) self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1) self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 60) self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 30) self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, 4) self.state = State.CONNECTING self.cleanup() try: self.sock.connect((self.ip, self.port)) except socket.error as err: if err.errno == errno.EINPROGRESS: return elif err.errno == errno.ECONNREFUSED: return def send(self, msg): self.sock.send(bytes(msg, 'utf-8')) return len(msg) def connect2(self): try: self.sock.connect((self.ip, self.port)) except socket.error as err: if err.errno == errno.EISCONN: logging.debug('Connected') self.state = State.RECEIVING else: time.sleep(1) logging.warning('Connection refused, retrying...') self.state = State.CONNECTING self.sock.close() self.connect() def receive(self): try: data = self.sock.recv(1024).decode('utf-8') except socket.error as err: data = '' logging.warning('Receive failed: %s', str(err)) if len(data) == 0: self.sock.close() self.ogrest.kill_process() self.connect() return self.data = self.data + data request = restRequest() if not self.trailer: header_len = self.data.find("\r\n\r\n") if header_len > 0: # https://stackoverflow.com/questions/4685217/parse-raw-http-headers request_line, headers_alone = self.data.split('\n', 1) headers = email.message_from_file(StringIO(headers_alone)) if 'Content-Length' in headers.keys(): self.content_len = int(headers['Content-Length']) if 'X-Sequence' in headers.keys(): self.seq = int(headers['X-Sequence']) self.trailer = True # Add 4 because self.data.find("\r\n\r\n") does not count # "\r\n\r\n" for the length self.header_len = header_len + 4 if self.trailer and (len(self.data) >= self.content_len + self.header_len): request.parser(self.data) self.ogrest.process_request(request, self) self.cleanup() def disconnect(self): self.state = State.FORCE_DISCONNECTED self.sock.shutdown(socket.SHUT_RDWR) self.sock.close() def run(self): while 1: sock = self.get_socket() event_sock = self.get_event_socket() state = self.get_state() if state == State.CONNECTING: readset = [ sock ] writeset = [ sock ] exceptset = [ sock ] elif state == State.FORCE_DISCONNECTED: return 0 else: readset = [ sock, event_sock ] if event_sock else [ sock ] writeset = [ ] exceptset = [ ] readable, writable, exception = select.select(readset, writeset, exceptset) if state == State.CONNECTING and sock in writable: self.connect2() elif state == State.RECEIVING and sock in readable: self.receive() elif state == State.CONNECTING and sock in exception: self.connect2() elif state == State.RECEIVING and event_sock in readable: message = event_sock.recv(4096).decode('utf-8').rstrip() self.send_event_hint(message) else: logging.critical('Invalid state: %s', str(state))