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Iface.py
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Iface.py
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import socket
import struct
import subprocess
from fcntl import ioctl
class Iface:
SIOCGIFMTU = 0x8921
SIOCSIFMTU = 0x8922
default_mtu = 1500
def __init__(self, ifname):
self.ifname = ifname
self.old_mtu = self.get_mtu()
def get_mtu(self):
'''Use socket ioctl call to get MTU size'''
s = socket.socket(type=socket.SOCK_DGRAM)
ifr = self.ifname + '\x00'*(32-len(self.ifname))
try:
ifs = ioctl(s, self.SIOCGIFMTU, ifr)
mtu = struct.unpack('<H',ifs[16:18])[0]
except Exception as s:
print('socket ioctl call failed: {0}'.format(s))
mtu = None
return mtu
def set_mtu(self, mtu):
'''Use socket ioctl call to set MTU size'''
s = socket.socket(type=socket.SOCK_DGRAM)
ifr = struct.pack('<16sH', self.ifname.encode('utf-8'), mtu) + '\x00'.encode('utf-8')*14
try:
ifs = ioctl(s, self.SIOCSIFMTU, ifr)
mtu = struct.unpack('<H',ifs[16:18])[0]
setted = True
except Exception as s:
print('socket ioctl call failed: {0}'.format(s))
setted = False
return setted
def get_default_mtu(self):
return self.default_mtu
def restore_mtu(self):
self.set_mtu(self.old_mtu)
def get_interface_name(self):
return self.ifname
def set_interface_name(self, ifname):
self.ifname = ifname