/usr/lib/python2.7/dist-packages/nemu/node.py is in python-nemu 0.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 | # vim:ts=4:sw=4:et:ai:sts=4
# -*- coding: utf-8 -*-
# Copyright 2010, 2011 INRIA
# Copyright 2011 MartÃn Ferrari <martin.ferrari@gmail.com>
#
# This file is part of Nemu.
#
# Nemu is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License version 2, as published by the Free
# Software Foundation.
#
# Nemu 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
# Nemu. If not, see <http://www.gnu.org/licenses/>.
import os, socket, sys, traceback, unshare, weakref
from nemu.environ import *
import nemu.interface, nemu.protocol, nemu.subprocess_
__all__ = ['Node', 'get_nodes', 'import_if']
class Node(object):
_nodes = weakref.WeakValueDictionary()
_nextnode = 0
@staticmethod
def get_nodes():
s = sorted(Node._nodes.items(), key = lambda x: x[0])
return [x[1] for x in s]
def __init__(self, nonetns = False, forward_X11 = False):
"""Create a new node in the emulation. Implemented as a separate
process in a new network name space. Requires root privileges to run.
If nonetns is true, the network name space is not created and can be
run as a normal user, for testing."""
# Initialize attributes, in case something fails during __init__
self._pid = self._slave = None
self._processes = weakref.WeakValueDictionary()
self._interfaces = weakref.WeakValueDictionary()
self._auto_interfaces = [] # just to keep them alive!
fd, pid = _start_child(nonetns)
self._pid = pid
debug("Node(0x%x).__init__(), pid = %s" % (id(self), pid))
self._slave = nemu.protocol.Client(fd, fd)
if forward_X11:
self._slave.enable_x11_forwarding()
Node._nodes[Node._nextnode] = self
Node._nextnode += 1
# Bring loopback up
if not nonetns:
self.get_interface("lo").up = True
def __del__(self):
debug("Node(0x%x).__del__()" % id(self))
self.destroy()
def destroy(self):
if not self._pid:
return
debug("Node(0x%x).destroy()" % id(self))
for p in self._processes.values():
p.destroy()
self._processes.clear()
# Use get_interfaces to force a rescan
for i in self.get_interfaces():
i.destroy()
self._interfaces.clear()
if self._slave:
self._slave.shutdown()
exitcode = eintr_wrapper(os.waitpid, self._pid, 0)[1]
if exitcode != 0:
error("Node(0x%x) process %d exited with non-zero status: %d" %
(id(self), self._pid, exitcode))
self._pid = self._slave = None
@property
def pid(self):
return self._pid
# Subprocesses
def _add_subprocess(self, subprocess):
self._processes[subprocess.pid] = subprocess
def Subprocess(self, *kargs, **kwargs):
return nemu.subprocess_.Subprocess(self, *kargs, **kwargs)
def Popen(self, *kargs, **kwargs):
return nemu.subprocess_.Popen(self, *kargs, **kwargs)
def system(self, *kargs, **kwargs):
return nemu.subprocess_.system(self, *kargs, **kwargs)
def backticks(self, *kargs, **kwargs):
return nemu.subprocess_.backticks(self, *kargs, **kwargs)
def backticks_raise(self, *kargs, **kwargs):
return nemu.subprocess_.backticks_raise(self, *kargs, **kwargs)
# Interfaces
def _add_interface(self, interface):
self._interfaces[interface.index] = interface
def add_if(self, **kwargs):
i = nemu.interface.NodeInterface(self)
for k, v in kwargs.items():
setattr(i, k, v)
return i
def add_tap(self, use_pi = False, **kwargs):
i = nemu.interface.TapNodeInterface(self, use_pi)
for k, v in kwargs.items():
setattr(i, k, v)
return i
def add_tun(self, use_pi = False, **kwargs):
i = nemu.interface.TunNodeInterface(self, use_pi)
for k, v in kwargs.items():
setattr(i, k, v)
return i
def import_if(self, interface):
return nemu.interface.ImportedNodeInterface(self, interface)
def del_if(self, iface):
"""Doesn't destroy the interface if it wasn't created by us."""
del self._interfaces[iface.index]
iface.destroy()
def get_interface(self, name):
return [i for i in self.get_interfaces() if i.name == name][0]
def get_interfaces(self):
if not self._slave:
return []
ifaces = self._slave.get_if_data()
for i in ifaces:
if i not in self._interfaces:
iface = nemu.interface.ImportedNodeInterface(self, i,
migrate = False)
self._auto_interfaces.append(iface) # keep it referenced!
self._interfaces[i] = iface
# by the way, clean up _interfaces
for i in list(self._interfaces): # copy before deleting!
if i not in ifaces:
notice("Node(0x%x): interface #%d went away." % (id(self), i))
self._interfaces[i].destroy()
del self._interfaces[i]
return sorted(self._interfaces.values(), key = lambda x: x.index)
def route(self, tipe = 'unicast', prefix = None, prefix_len = 0,
nexthop = None, interface = None, metric = 0):
return nemu.iproute.route(tipe, prefix, prefix_len, nexthop,
interface.index if interface else None, metric)
def add_route(self, *args, **kwargs):
# Accepts either a route object or all its constructor's parameters
if len(args) == 1 and not kwargs:
r = args[0]
else:
r = self.route(*args, **kwargs)
return self._slave.add_route(r)
def del_route(self, *args, **kwargs):
if len(args) == 1 and not kwargs:
r = args[0]
else:
r = self.route(*args, **kwargs)
return self._slave.del_route(r)
def get_routes(self):
return self._slave.get_route_data()
# Handle the creation of the child; parent gets (fd, pid), child creates and
# runs a Server(); never returns.
# Requires CAP_SYS_ADMIN privileges to run.
def _start_child(nonetns):
# Create socket pair to communicate
(s0, s1) = socket.socketpair(socket.AF_UNIX, socket.SOCK_STREAM, 0)
# Spawn a child that will run in a loop
pid = os.fork()
if pid:
s1.close()
return (s0, pid)
# FIXME: clean up signal handers, atexit functions, etc.
try: # pragma: no cover
# coverage doesn't seem to understand fork
s0.close()
srv = nemu.protocol.Server(s1, s1)
if not nonetns:
# create new name space
unshare.unshare(unshare.CLONE_NEWNET)
# Enable packet forwarding
execute([SYSCTL_PATH, '-w', 'net.ipv4.ip_forward=1'])
execute([SYSCTL_PATH, '-w', 'net.ipv6.conf.default.forwarding=1'])
srv.run()
except BaseException, e:
s = "Slave node aborting: %s\n" % str(e)
sep = "=" * 70 + "\n"
sys.stderr.write(s + sep)
traceback.print_exc(file=sys.stdout)
sys.stderr.write(sep)
try:
# try to pass the error to parent, if possible
s1.send("500 " + s)
except:
pass
os._exit(1)
os._exit(0) # pragma: no cover
# NOTREACHED
get_nodes = Node.get_nodes
import_if = nemu.interface.ImportedInterface
|