mirror of
https://github.com/GNS3/gns3-server
synced 2024-12-25 00:08:11 +00:00
252 lines
8.1 KiB
Python
252 lines
8.1 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2015 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import socket
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import ipaddress
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from aiohttp.web import HTTPConflict
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from gns3server.config import Config
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import logging
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log = logging.getLogger(__name__)
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class PortManager:
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"""
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:param host: IP address to bind for console connections
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"""
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def __init__(self, host="127.0.0.1"):
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self._console_host = host
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self._udp_host = host
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self._used_tcp_ports = set()
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self._used_udp_ports = set()
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server_config = Config.instance().get_section_config("Server")
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remote_console_connections = server_config.getboolean("allow_remote_console")
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console_start_port_range = server_config.getint("console_start_port_range", 2000)
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console_end_port_range = server_config.getint("console_end_port_range", 5000)
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self._console_port_range = (console_start_port_range, console_end_port_range)
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log.debug("Console port range is {}-{}".format(console_start_port_range, console_end_port_range))
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udp_start_port_range = server_config.getint("udp_start_port_range", 10000)
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udp_end_port_range = server_config.getint("udp_end_port_range", 20000)
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self._udp_port_range = (udp_start_port_range, udp_end_port_range)
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log.debug("UDP port range is {}-{}".format(udp_start_port_range, udp_end_port_range))
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if remote_console_connections:
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log.warning("Remote console connections are allowed")
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if ipaddress.ip_address(host).version == 6:
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self._console_host = "::"
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else:
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self._console_host = "0.0.0.0"
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else:
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self._console_host = host
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PortManager._instance = self
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@classmethod
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def instance(cls):
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"""
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Singleton to return only one instance of PortManager.
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:returns: instance of PortManager
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"""
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if not hasattr(cls, "_instance") or cls._instance is None:
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cls._instance = cls()
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return cls._instance
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@property
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def console_host(self):
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return self._console_host
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@console_host.setter
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def console_host(self, new_host):
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self._console_host = new_host
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@property
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def console_port_range(self):
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return self._console_port_range
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@console_host.setter
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def console_port_range(self, new_range):
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assert isinstance(new_range, tuple)
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self._console_port_range = new_range
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@property
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def udp_host(self):
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return self._udp_host
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@udp_host.setter
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def host(self, new_host):
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self._udp_host = new_host
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@property
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def udp_port_range(self):
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return self._udp_port_range
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@udp_host.setter
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def udp_port_range(self, new_range):
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assert isinstance(new_range, tuple)
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self._udp_port_range = new_range
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@property
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def tcp_ports(self):
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return self._used_tcp_ports
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@property
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def udp_ports(self):
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return self._used_udp_ports
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@staticmethod
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def find_unused_port(start_port, end_port, host="127.0.0.1", socket_type="TCP", ignore_ports=[]):
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"""
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Finds an unused port in a range.
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:param start_port: first port in the range
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:param end_port: last port in the range
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:param host: host/address for bind()
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:param socket_type: TCP (default) or UDP
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:param ignore_ports: list of port to ignore within the range
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"""
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if end_port < start_port:
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raise Exception("Invalid port range {}-{}".format(start_port, end_port))
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if socket_type == "UDP":
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socket_type = socket.SOCK_DGRAM
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else:
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socket_type = socket.SOCK_STREAM
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last_exception = None
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for port in range(start_port, end_port + 1):
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if port in ignore_ports:
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continue
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try:
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if ":" in host:
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# IPv6 address support
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with socket.socket(socket.AF_INET6, socket_type) as s:
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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s.bind((host, port)) # the port is available if bind is a success
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else:
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with socket.socket(socket.AF_INET, socket_type) as s:
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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s.bind((host, port)) # the port is available if bind is a success
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return port
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except OSError as e:
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last_exception = e
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if port + 1 == end_port:
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break
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else:
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continue
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raise HTTPConflict(text="Could not find a free port between {} and {} on host {}, last exception: {}".format(start_port,
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end_port,
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host,
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last_exception))
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def get_free_tcp_port(self):
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"""
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Get an available TCP port and reserve it
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"""
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port = self.find_unused_port(self._console_port_range[0],
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self._console_port_range[1],
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host=self._console_host,
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socket_type="TCP",
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ignore_ports=self._used_tcp_ports)
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self._used_tcp_ports.add(port)
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log.debug("TCP port {} has been allocated".format(port))
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return port
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def reserve_tcp_port(self, port):
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"""
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Reserve a specific TCP port number
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:param port: TCP port number
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"""
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if port in self._used_tcp_ports:
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raise HTTPConflict(text="TCP port {} already in use on host".format(port, self._console_host))
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self._used_tcp_ports.add(port)
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log.debug("TCP port {} has been reserved".format(port))
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return port
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def release_tcp_port(self, port):
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"""
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Release a specific TCP port number
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:param port: TCP port number
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"""
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if port in self._used_tcp_ports:
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self._used_tcp_ports.remove(port)
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log.debug("TCP port {} has been released".format(port))
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def get_free_udp_port(self):
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"""
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Get an available UDP port and reserve it
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"""
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port = self.find_unused_port(self._udp_port_range[0],
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self._udp_port_range[1],
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host=self._udp_host,
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socket_type="UDP",
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ignore_ports=self._used_udp_ports)
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self._used_udp_ports.add(port)
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log.debug("UDP port {} has been allocated".format(port))
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return port
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def reserve_udp_port(self, port):
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"""
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Reserve a specific UDP port number
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:param port: UDP port number
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"""
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if port in self._used_udp_ports:
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raise HTTPConflict(text="UDP port {} already in use on host".format(port, self._console_host))
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self._used_udp_ports.add(port)
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log.debug("UDP port {} has been reserved".format(port))
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def release_udp_port(self, port):
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"""
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Release a specific UDP port number
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:param port: UDP port number
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"""
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if port in self._used_udp_ports:
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self._used_udp_ports.remove(port)
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log.debug("UDP port {} has been released".format(port))
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