mirror of
https://github.com/GNS3/gns3-server.git
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67 lines
2.3 KiB
Python
67 lines
2.3 KiB
Python
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# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2014 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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"""
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Useful functions... in the attic ;)
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"""
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import socket
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import errno
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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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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.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.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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if e.errno == errno.EADDRINUSE: # socket already in use
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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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else:
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raise Exception("Could not find an unused port: {}".format(e))
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raise Exception("Could not find a free port between {0} and {1}".format(start_port, end_port))
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