# -*- coding: utf-8 -*- # # Copyright (C) 2015 GNS3 Technologies Inc. # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . import socket import ipaddress from aiohttp.web import HTTPConflict from gns3server.config import Config import logging log = logging.getLogger(__name__) class PortManager: """ :param host: IP address to bind for console connections """ def __init__(self, host="127.0.0.1"): self._console_host = host # UDP host must be 0.0.0.0, reason: https://github.com/GNS3/gns3-server/issues/265 self._udp_host = "0.0.0.0" self._used_tcp_ports = set() self._used_udp_ports = set() server_config = Config.instance().get_section_config("Server") remote_console_connections = server_config.getboolean("allow_remote_console") console_start_port_range = server_config.getint("console_start_port_range", 5000) console_end_port_range = server_config.getint("console_end_port_range", 10000) self._console_port_range = (console_start_port_range, console_end_port_range) log.debug("Console port range is {}-{}".format(console_start_port_range, console_end_port_range)) udp_start_port_range = server_config.getint("udp_start_port_range", 10000) udp_end_port_range = server_config.getint("udp_end_port_range", 20000) self._udp_port_range = (udp_start_port_range, udp_end_port_range) log.debug("UDP port range is {}-{}".format(udp_start_port_range, udp_end_port_range)) if remote_console_connections: log.warning("Remote console connections are allowed") if ipaddress.ip_address(host).version == 6: self._console_host = "::" else: self._console_host = "0.0.0.0" else: self._console_host = host PortManager._instance = self @classmethod def instance(cls): """ Singleton to return only one instance of PortManager. :returns: instance of PortManager """ if not hasattr(cls, "_instance") or cls._instance is None: cls._instance = cls() return cls._instance @property def console_host(self): return self._console_host @console_host.setter def console_host(self, new_host): self._console_host = new_host @property def console_port_range(self): return self._console_port_range @console_port_range.setter def console_port_range(self, new_range): assert isinstance(new_range, tuple) self._console_port_range = new_range @property def udp_host(self): return self._udp_host @udp_host.setter def host(self, new_host): self._udp_host = new_host @property def udp_port_range(self): return self._udp_port_range @udp_port_range.setter def udp_port_range(self, new_range): assert isinstance(new_range, tuple) self._udp_port_range = new_range @property def tcp_ports(self): return self._used_tcp_ports @property def udp_ports(self): return self._used_udp_ports @staticmethod def find_unused_port(start_port, end_port, host="127.0.0.1", socket_type="TCP", ignore_ports=[]): """ Finds an unused port in a range. :param start_port: first port in the range :param end_port: last port in the range :param host: host/address for bind() :param socket_type: TCP (default) or UDP :param ignore_ports: list of port to ignore within the range """ if end_port < start_port: raise HTTPConflict(text="Invalid port range {}-{}".format(start_port, end_port)) last_exception = None for port in range(start_port, end_port + 1): if port in ignore_ports: continue try: PortManager._check_port(host, port, socket_type) return port except OSError as e: last_exception = e if port + 1 == end_port: break else: continue raise HTTPConflict(text="Could not find a free port between {} and {} on host {}, last exception: {}".format(start_port, end_port, host, last_exception)) @staticmethod def _check_port(host, port, socket_type): """ Check if an a port is available and raise an OSError if port is not available :returns: boolean """ if socket_type == "UDP": socket_type = socket.SOCK_DGRAM else: socket_type = socket.SOCK_STREAM for res in socket.getaddrinfo(host, port, socket.AF_UNSPEC, socket_type, 0, socket.AI_PASSIVE): af, socktype, proto, _, sa = res with socket.socket(af, socktype, proto) as s: s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.bind(sa) # the port is available if bind is a success return True def get_free_tcp_port(self, project, port_range_start=None, port_range_end=None): """ Get an available TCP port and reserve it :param project: Project instance """ # use the default range is not specific one is given if port_range_start is None and port_range_end is None: port_range_start = self._console_port_range[0] port_range_end = self._console_port_range[1] port = self.find_unused_port(port_range_start, port_range_end, host=self._console_host, socket_type="TCP", ignore_ports=self._used_tcp_ports) self._used_tcp_ports.add(port) project.record_tcp_port(port) log.debug("TCP port {} has been allocated".format(port)) return port def reserve_tcp_port(self, port, project, port_range_start=None, port_range_end=None): """ Reserve a specific TCP port number. If not available replace it by another. :param port: TCP port number :param project: Project instance :param port_range_start: Port range to use :param port_range_end: Port range to use :returns: The TCP port """ # use the default range is not specific one is given if port_range_start is None and port_range_end is None: port_range_start = self._console_port_range[0] port_range_end = self._console_port_range[1] if port in self._used_tcp_ports: old_port = port port = self.get_free_tcp_port(project, port_range_start=port_range_start, port_range_end=port_range_end) msg = "TCP port {} already in use on host {}. Port has been replaced by {}".format(old_port, self._console_host, port) log.warning(msg) project.emit("log.warning", {"message": msg}) return port if port < self._console_port_range[0] or port > self._console_port_range[1]: old_port = port port = self.get_free_tcp_port(project, port_range_start=port_range_start, port_range_end=port_range_end) msg = "TCP port {} is outside the range {}-{} on host {}. Port has been replaced by {}".format(old_port, port_range_start, port_range_end, self._console_host, port) log.warning(msg) project.emit("log.warning", {"message": msg}) return port try: PortManager._check_port(self._console_host, port, "TCP") except OSError: old_port = port port = self.get_free_tcp_port(project, port_range_start=port_range_start, port_range_end=port_range_end) msg = "TCP port {} already in use on host {}. Port has been replaced by {}".format(old_port, self._console_host, port) log.warning(msg) project.emit("log.warning", {"message": msg}) return port self._used_tcp_ports.add(port) project.record_tcp_port(port) log.debug("TCP port {} has been reserved".format(port)) return port def release_tcp_port(self, port, project): """ Release a specific TCP port number :param port: TCP port number :param project: Project instance """ if port in self._used_tcp_ports: self._used_tcp_ports.remove(port) project.remove_tcp_port(port) log.debug("TCP port {} has been released".format(port)) def get_free_udp_port(self, project): """ Get an available UDP port and reserve it :param project: Project instance """ port = self.find_unused_port(self._udp_port_range[0], self._udp_port_range[1], host=self._udp_host, socket_type="UDP", ignore_ports=self._used_udp_ports) self._used_udp_ports.add(port) project.record_udp_port(port) log.debug("UDP port {} has been allocated".format(port)) return port def reserve_udp_port(self, port, project): """ Reserve a specific UDP port number :param port: UDP port number :param project: Project instance """ if port in self._used_udp_ports: raise HTTPConflict(text="UDP port {} already in use on host {}".format(port, self._console_host)) if port < self._udp_port_range[0] or port > self._udp_port_range[1]: raise HTTPConflict(text="UDP port {} is outside the range {}-{}".format(port, self._udp_port_range[0], self._udp_port_range[1])) self._used_udp_ports.add(port) project.record_udp_port(port) log.debug("UDP port {} has been reserved".format(port)) def release_udp_port(self, port, project): """ Release a specific UDP port number :param port: UDP port number :param project: Project instance """ if port in self._used_udp_ports: self._used_udp_ports.remove(port) project.remove_udp_port(port) log.debug("UDP port {} has been released".format(port))