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138 lines
4.3 KiB
138 lines
4.3 KiB
# -*- 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 sys
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import os
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import struct
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import socket
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import errno
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import time
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import logging
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log = logging.getLogger(__name__)
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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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def wait_socket_is_ready(host, port, wait=2.0, socket_timeout=10):
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"""
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Waits for a socket to be ready for wait time.
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:param host: host/address to connect to
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:param port: port to connect to
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:param wait: maximum wait time
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:param socket_timeout: timeout for the socket
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:returns: tuple with boolean indicating if the socket is ready and the last exception
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that occurred when connecting to the socket
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"""
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# connect to a local address by default
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# if listening to all addresses (IPv4 or IPv6)
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if host == "0.0.0.0":
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host = "127.0.0.1"
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elif host == "::":
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host = "::1"
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connection_success = False
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begin = time.time()
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last_exception = None
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while time.time() - begin < wait:
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time.sleep(0.01)
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try:
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with socket.create_connection((host, port), socket_timeout):
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pass
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except OSError as e:
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last_exception = e
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continue
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connection_success = True
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break
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return connection_success, last_exception
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def has_privileged_access(executable):
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"""
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Check if an executable can access Ethernet and TAP devices in
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RAW mode.
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:param executable: executable path
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:returns: True or False
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"""
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# we are root, so we should have privileged access too
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if os.geteuid() == 0:
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return True
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# test if the executable has the CAP_NET_RAW capability (Linux only)
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if sys.platform.startswith("linux") and "security.capability" in os.listxattr(executable):
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try:
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caps = os.getxattr(executable, "security.capability")
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# test the 2nd byte and check if the 13th bit (CAP_NET_RAW) is set
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if struct.unpack("<IIIII", caps)[1] & 1 << 13:
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return True
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except Exception as e:
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log.error("could not determine if CAP_NET_RAW capability is set for {}: {}".format(executable, e))
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return False
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