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cl349@firebug.cl.cam.ac.uk
627aaffcb5
Many files:
g/c _readline{,s} and use regular readline{,s} functions -- the special
_readline{,s} functions were only needed because of Twisted.
ip.py:
Also use readlines() instead of xreadlines().
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
122 lines
3.1 KiB
Python
122 lines
3.1 KiB
Python
import os
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import re
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import socket
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import struct
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import errno
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##### Networking-related functions
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def get_defaultroute():
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fd = os.popen('/sbin/ip route list 2>/dev/null')
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for line in fd.readlines():
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m = re.search('^default via ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+) dev ([^ ]*)',
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line)
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if m:
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return [m.group(1), m.group(2)]
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return [None, None]
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def get_current_ipaddr(dev='defaultroute'):
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"""Get the primary IP address for the given network interface.
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dev network interface (default: default route device)
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returns interface address as a string
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"""
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if dev == 'defaultroute':
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dev = get_defaultroute()[1]
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if not dev:
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return
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fd = os.popen( '/sbin/ifconfig ' + dev + ' 2>/dev/null' )
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for line in fd.readlines():
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m = re.search( '^\s+inet addr:([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+).*',
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line )
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if m:
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return m.group(1)
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return None
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def get_current_ipmask(dev='defaultroute'):
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"""Get the primary IP netmask for a network interface.
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dev network interface (default: default route device)
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returns interface netmask as a string
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"""
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if dev == 'defaultroute':
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dev = get_defaultroute()[1]
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if not dev:
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return
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fd = os.popen( '/sbin/ifconfig ' + dev + ' 2>/dev/null' )
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for line in fd.readlines():
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m = re.search( '^.+Mask:([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+).*',
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line )
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if m:
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return m.group(1)
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return None
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def get_current_ipgw(dev='defaultroute'):
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"""Get the IP gateway for a network interface.
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dev network interface (default: default route device)
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returns gateway address as a string
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"""
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if dev == 'defaultroute':
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return get_defaultroute()[0]
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if not dev:
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return
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fd = os.popen( '/sbin/route -n' )
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for line in fd.readlines():
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m = re.search( '^\S+\s+([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)' +
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'\s+\S+\s+\S*G.*' + dev + '.*', line )
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if m:
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return m.group(1)
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return None
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def inet_aton(addr):
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"""Convert an IP addr in IPv4 dot notation into an int.
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addr IP address as a string
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returns integer
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"""
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b = socket.inet_aton(addr)
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return struct.unpack('!I', b)[0]
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def inet_ntoa(n):
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"""Convert an int into an IP addr in IPv4 dot notation.
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n IP address
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returns string
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"""
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b = struct.pack('!I', n)
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return socket.inet_ntoa(b)
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def add_offset_to_ip(addr, offset):
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"""Add a numerical offset to an IP addr in IPv4 dot notation.
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addr IP address
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offset offset to add
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returns new address
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"""
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n = inet_aton(addr)
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n += offset
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return inet_ntoa(n)
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def check_subnet( ip, network, netmask ):
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"""Check if an IP address is in the subnet defined by
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a network address and mask'.
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ip IP adress
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network network address
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netmask network mask
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returns 1 if it is in the subnet, 0 if not
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"""
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n_ip = inet_aton(ip)
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n_net = inet_aton(network)
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n_mask = inet_aton(netmask)
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return (n_ip & n_mask) == (n_net & n_mask)
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