mirror of
https://github.com/GNS3/gns3-server
synced 2024-11-25 01:38:08 +00:00
315 lines
11 KiB
Python
315 lines
11 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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# This ports are disallowed by Chrome and Firefox to avoid trouble with skip them
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BANNED_PORTS = set((1, 7, 9, 11, 13, 15, 17, 19, 20, 21, 22, 23, 25, 37, 42, 43, 53, 77, 79, 87, 95, 101, 102, 103, 104, 109, 110, 111, 113, 115, 117, 119, 123, 135, 139, 143, 179, 389, 465, 512, 513, 514, 515, 526, 530, 531, 532, 540, 556, 563, 587, 601, 636, 993, 995, 2049, 3659, 4045, 6000, 6665, 6666, 6667, 6668, 6669))
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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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# UDP host must be 0.0.0.0, reason: https://github.com/GNS3/gns3-server/issues/265
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self._udp_host = "0.0.0.0"
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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", 5000)
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console_end_port_range = server_config.getint("console_end_port_range", 10000)
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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_port_range.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 udp_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_port_range.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 HTTPConflict(text="Invalid port range {}-{}".format(start_port, end_port))
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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 or port in BANNED_PORTS:
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continue
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try:
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PortManager._check_port(host, port, socket_type)
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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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@staticmethod
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def _check_port(host, port, socket_type):
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"""
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Check if an a port is available and raise an OSError if port is not available
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:returns: boolean
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"""
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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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for res in socket.getaddrinfo(host, port, socket.AF_UNSPEC, socket_type, 0, socket.AI_PASSIVE):
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af, socktype, proto, _, sa = res
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with socket.socket(af, socktype, proto) as s:
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s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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s.bind(sa) # the port is available if bind is a success
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return True
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def get_free_tcp_port(self, project, port_range_start=None, port_range_end=None):
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"""
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Get an available TCP port and reserve it
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:param project: Project instance
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"""
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# use the default range is not specific one is given
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if port_range_start is None and port_range_end is None:
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port_range_start = self._console_port_range[0]
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port_range_end = self._console_port_range[1]
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port = self.find_unused_port(port_range_start,
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port_range_end,
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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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project.record_tcp_port(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, project, port_range_start=None, port_range_end=None):
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"""
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Reserve a specific TCP port number. If not available replace it
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by another.
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:param port: TCP port number
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:param project: Project instance
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:param port_range_start: Port range to use
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:param port_range_end: Port range to use
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:returns: The TCP port
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"""
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# use the default range is not specific one is given
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if port_range_start is None and port_range_end is None:
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port_range_start = self._console_port_range[0]
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port_range_end = self._console_port_range[1]
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if port in self._used_tcp_ports:
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old_port = port
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port = self.get_free_tcp_port(project, port_range_start=port_range_start, port_range_end=port_range_end)
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msg = "TCP port {} already in use on host {}. Port has been replaced by {}".format(old_port, self._console_host, port)
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log.debug(msg)
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#project.emit("log.warning", {"message": msg})
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return port
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if port < port_range_start or port > port_range_end:
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old_port = port
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port = self.get_free_tcp_port(project, port_range_start=port_range_start, port_range_end=port_range_end)
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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)
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log.debug(msg)
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#project.emit("log.warning", {"message": msg})
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return port
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try:
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PortManager._check_port(self._console_host, port, "TCP")
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except OSError:
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old_port = port
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port = self.get_free_tcp_port(project, port_range_start=port_range_start, port_range_end=port_range_end)
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msg = "TCP port {} already in use on host {}. Port has been replaced by {}".format(old_port, self._console_host, port)
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log.debug(msg)
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#project.emit("log.warning", {"message": msg})
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return port
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self._used_tcp_ports.add(port)
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project.record_tcp_port(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, project):
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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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:param project: Project instance
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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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project.remove_tcp_port(port)
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log.debug("TCP port {} has been released".format(port))
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def get_free_udp_port(self, project):
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"""
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Get an available UDP port and reserve it
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:param project: Project instance
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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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project.record_udp_port(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, project):
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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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:param project: Project instance
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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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if port < self._udp_port_range[0] or port > self._udp_port_range[1]:
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raise HTTPConflict(text="UDP port {} is outside the range {}-{}".format(port, self._udp_port_range[0], self._udp_port_range[1]))
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self._used_udp_ports.add(port)
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project.record_udp_port(port)
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log.debug("UDP port {} has been reserved".format(port))
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def release_udp_port(self, port, project):
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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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:param project: Project instance
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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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project.remove_udp_port(port)
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log.debug("UDP port {} has been released".format(port))
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