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"""Bridge control utilities.
"""
import os
import os.path
import re
import sys
os.defpath = os.defpath + ':/sbin:/usr/sbin:/usr/local/sbin'
CMD_IFCONFIG = 'ifconfig'
CMD_ROUTE = 'route'
CMD_BRCTL = 'brctl'
CMD_IPTABLES = "iptables"
opts = None
class Opts:
def __init__(self, defaults):
for (k, v) in defaults.items():
setattr(self, k, v)
pass
def cmd(p, s):
"""Print and execute command 'p' with args 's'.
"""
global opts
c = p + ' ' + s
if opts.verbose: print c
if not opts.dryrun:
os.system(c)
def vif_bridge_add(params):
"""Add the network interface for vif on dom to a bridge.
"""
cmd(CMD_BRCTL, 'addif %(bridge)s %(vif)s' % params)
def vif_bridge_rem(params):
"""Remove the network interface for vif on dom from a bridge.
"""
cmd(CMD_BRCTL, 'delif %(bridge)s %(vif)s' % params)
def vif_restrict_addr(vif, addr, delete=0):
d = { 'vif': vif, 'addr': addr}
if delete:
d['flag'] = '-D'
else:
d['flag'] = '-A'
cmd(CMD_IPTABLES, '-P FORWARD DROP')
cmd(CMD_IPTABLES, '%(flag)s FORWARD -m physdev --physdev-in %(vif)s -s %(addr)s -j ACCEPT' % d)
cmd(CMD_IPTABLES, '%(flag)s FORWARD -m physdev --physdev-out %(vif)s -d %(addr)s -j ACCEPT' % d)
def bridge_create(bridge, **kwd):
"""Create a bridge.
Defaults hello time to 0, forward delay to 0 and stp off.
"""
cmd(CMD_BRCTL, 'addbr %s' % bridge)
if kwd.get('hello', None) is None:
kwd['hello'] = 0
if kwd.get('fd', None) is None:
kwd['fd'] = 0
if kwd.get('stp', None) is None:
kwd['stp'] = 'off'
bridge_set(bridge, **kwd)
def bridge_set(bridge, hello=None, fd=None, stp=None):
"""Set bridge parameters.
"""
if hello is not None:
cmd(CMD_BRCTL, 'sethello %s %d' % (bridge, hello))
if fd is not None:
cmd(CMD_BRCTL, 'setfd %s %d' % (bridge, fd))
if stp is not None:
cmd(CMD_BRCTL, 'stp %s %s' % (bridge, stp))
def bridge_del(bridge):
"""Delete a bridge.
"""
cmd(CMD_BRCTL, 'delbr %s' % bridge)
def routes():
"""Return a list of the routes.
"""
fin = os.popen(CMD_ROUTE + ' -n', 'r')
routes = []
for x in fin:
if x.startswith('Kernel'): continue
if x.startswith('Destination'): continue
x = x.strip()
y = x.split()
z = { 'destination': y[0],
'gateway' : y[1],
'mask' : y[2],
'flags' : y[3],
'metric' : y[4],
'ref' : y[5],
'use' : y[6],
'interface' : y[7] }
routes.append(z)
return routes
def ifconfig(interface):
"""Return the ip config for an interface,
"""
fin = os.popen(CMD_IFCONFIG + ' %s' % interface, 'r')
inetre = re.compile('\s*inet\s*addr:(?P<address>\S*)\s*Bcast:(?P<broadcast>\S*)\s*Mask:(?P<mask>\S*)')
info = None
for x in fin:
m = inetre.match(x)
if not m: continue
info = m.groupdict()
info['interface'] = interface
break
return info
def reconfigure(interface, bridge):
"""Reconfigure an interface to be attached to a bridge, and give the bridge
the IP address etc. from interface. Move the default route to the interface
to the bridge.
"""
global opts
intf_info = ifconfig(interface)
if not intf_info:
print >>sys.stderr, 'Interface not found:', interface
return
#bridge_info = ifconfig(bridge)
#if not bridge_info:
# print >>sys.stderr, 'Bridge not found:', bridge
# return
route_info = routes()
intf_info['bridge'] = bridge
intf_info['gateway'] = None
for r in route_info:
if (r['destination'] == '0.0.0.0' and
'G' in r['flags'] and
r['interface'] == interface):
intf_info['gateway'] = r['gateway']
if not intf_info['gateway']:
print >>sys.stderr, 'Gateway not found: ', interface
return
cmd(CMD_IFCONFIG,
'%(bridge)s %(address)s netmask %(mask)s broadcast %(broadcast)s up'
% intf_info)
cmd(CMD_ROUTE,
'add default gateway %(gateway)s dev %(bridge)s'
% intf_info)
cmd(CMD_BRCTL, 'addif %(bridge)s %(interface)s' % intf_info)
cmd(CMD_IFCONFIG, '%(interface)s 0.0.0.0' % intf_info)
defaults = {
'verbose' : 1,
'dryrun' : 0,
}
opts = Opts(defaults)
def set_opts(val):
global opts
opts = val
return opts
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