mirror of
https://github.com/GNS3/gns3-server
synced 2024-11-24 17:28:08 +00:00
147 lines
4.6 KiB
Python
147 lines
4.6 KiB
Python
# -*- coding: utf-8 -*-
|
|
#
|
|
# Copyright (C) 2014 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 <http://www.gnu.org/licenses/>.
|
|
|
|
"""
|
|
Useful functions... in the attic ;)
|
|
"""
|
|
|
|
import sys
|
|
import os
|
|
import struct
|
|
import socket
|
|
import stat
|
|
import errno
|
|
import time
|
|
|
|
import logging
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
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 Exception("Invalid port range {}-{}".format(start_port, end_port))
|
|
|
|
if socket_type == "UDP":
|
|
socket_type = socket.SOCK_DGRAM
|
|
else:
|
|
socket_type = socket.SOCK_STREAM
|
|
|
|
last_exception = None
|
|
for port in range(start_port, end_port + 1):
|
|
if port in ignore_ports:
|
|
continue
|
|
try:
|
|
if ":" in host:
|
|
# IPv6 address support
|
|
with socket.socket(socket.AF_INET6, socket_type) as s:
|
|
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
|
|
s.bind((host, port)) # the port is available if bind is a success
|
|
else:
|
|
with socket.socket(socket.AF_INET, socket_type) as s:
|
|
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
|
|
s.bind((host, port)) # the port is available if bind is a success
|
|
return port
|
|
except OSError as e:
|
|
last_exception = e
|
|
if port + 1 == end_port:
|
|
break
|
|
else:
|
|
continue
|
|
|
|
raise Exception("Could not find a free port between {} and {} on host {}, last exception: {}".format(start_port, end_port, host, last_exception))
|
|
|
|
|
|
def wait_socket_is_ready(host, port, wait=2.0, socket_timeout=10):
|
|
"""
|
|
Waits for a socket to be ready for wait time.
|
|
|
|
:param host: host/address to connect to
|
|
:param port: port to connect to
|
|
:param wait: maximum wait time
|
|
:param socket_timeout: timeout for the socket
|
|
|
|
:returns: tuple with boolean indicating if the socket is ready and the last exception
|
|
that occurred when connecting to the socket
|
|
"""
|
|
|
|
# connect to a local address by default
|
|
# if listening to all addresses (IPv4 or IPv6)
|
|
if host == "0.0.0.0":
|
|
host = "127.0.0.1"
|
|
elif host == "::":
|
|
host = "::1"
|
|
|
|
connection_success = False
|
|
begin = time.time()
|
|
last_exception = None
|
|
while time.time() - begin < wait:
|
|
time.sleep(0.01)
|
|
try:
|
|
with socket.create_connection((host, port), socket_timeout):
|
|
pass
|
|
except OSError as e:
|
|
last_exception = e
|
|
continue
|
|
connection_success = True
|
|
break
|
|
|
|
return connection_success, last_exception
|
|
|
|
|
|
def has_privileged_access(executable):
|
|
"""
|
|
Check if an executable can access Ethernet and TAP devices in
|
|
RAW mode.
|
|
|
|
:param executable: executable path
|
|
|
|
:returns: True or False
|
|
"""
|
|
|
|
if sys.platform.startswith("win"):
|
|
# do not check anything on Windows
|
|
return True
|
|
|
|
if os.geteuid() == 0:
|
|
# we are root, so we should have privileged access.
|
|
return True
|
|
if os.stat(executable).st_mode & stat.S_ISUID or os.stat(executable).st_mode & stat.S_ISGID:
|
|
# the executable has set UID bit.
|
|
return True
|
|
|
|
# test if the executable has the CAP_NET_RAW capability (Linux only)
|
|
if sys.platform.startswith("linux") and "security.capability" in os.listxattr(executable):
|
|
try:
|
|
caps = os.getxattr(executable, "security.capability")
|
|
# test the 2nd byte and check if the 13th bit (CAP_NET_RAW) is set
|
|
if struct.unpack("<IIIII", caps)[1] & 1 << 13:
|
|
return True
|
|
except Exception as e:
|
|
log.error("could not determine if CAP_NET_RAW capability is set for {}: {}".format(executable, e))
|
|
|
|
return False
|