Initial commit
This commit is contained in:
@@ -0,0 +1,23 @@
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import logging
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from flask import Flask, jsonify
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class NetDhcpError(Exception):
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def __init__(self, status, *args):
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Exception.__init__(self, *args)
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self.status = status
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app = Flask(__name__)
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from . import network
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logger = logging.getLogger('gunicorn.error')
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@app.errorhandler(404)
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def err_not_found(_e):
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return jsonify({'Err': 'API not found'}), 404
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@app.errorhandler(Exception)
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def err(e):
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logger.exception(e)
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return jsonify({'Err': str(e)}), 500
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@@ -0,0 +1,14 @@
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import logging
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import socketserver
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from werkzeug.serving import run_simple
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from . import app
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fh = logging.FileHandler('/var/log/net-dhcp.log')
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fh.setFormatter(logging.Formatter('%(asctime)s [%(levelname)s] %(message)s'))
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logger = logging.getLogger('net-dhcp')
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logger.setLevel(logging.DEBUG)
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logger.addHandler(fh)
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socketserver.TCPServer.allow_reuse_address = True
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run_simple('unix:///run/docker/plugins/net-dhcp.sock', 0, app)
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@@ -0,0 +1,203 @@
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import atexit
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import pyroute2
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#-------------------------------
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def InitializeLibrary(library):
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if library == 'NDB':
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global ndb
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ndb = pyroute2.NDB()
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@atexit.register
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def close_ndb():
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ndb.close()
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elif library == 'IPR':
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global iproute
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iproute = pyroute2.IPRoute()
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@atexit.register
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def close_iproute():
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iproute.close()
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#-------------------------------
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def GetInterfaces(library):
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interfaces = []
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if library == 'NDB':
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for itf in ndb.interfaces:
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interfaces.append(Interface(ndb.interfaces[itf.ifname]))
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elif library == 'IPR':
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for itf in iproute.get_links():
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interfaces.append(Interface(itf))
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return interfaces
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def GetInterface(library, ifname):
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if library == 'NDB':
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return Interface(ndb.interfaces[ifname])
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elif library == 'IPR':
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return Interface(iproute.get_links(ifname=ifname)[0])
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return None
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class Interface:
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def __init__(self, interface):
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self.ndb = None
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self.ipr = None
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self._set_interface_(interface)
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self._initialize_attributes_()
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def __getitem__(self, key):
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return getattr(self, key, None)
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def _set_interface_(self, interface):
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if isinstance(interface, pyroute2.netlink.rtnl.ifinfmsg.ifinfmsg):
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self.ipr = interface
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elif isinstance(interface, pyroute2.ndb.objects.interface.Interface):
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self.ndb = interface
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def _initialize_attributes_(self):
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if self.ndb:
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self.index = self.ndb['index']
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self.ifname = self.ndb['ifname']
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self.kind = self.ndb['kind']
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self.address = self.ndb['address']
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if 'netns' in self.ndb:
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self.netns = self.ndb['netns']
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else:
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self.netns = None
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self.ipaddr = []
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for address in self.ndb.ipaddr:
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ipaddress = {}
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ipaddress['address'] = address['address']
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ipaddress['prefixlen'] = address['prefixlen']
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self.ipaddr.append(ipaddress)
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self.routes = []
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for r in self.ndb.routes:
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route = {}
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route['type'] = r['type']
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route['family'] = r['family']
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route['dst'] = r['dst']
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route['gateway'] = r['gateway']
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route['dst_len'] = r['dst_len']
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self.routes.append(route)
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elif self.ipr:
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self.index = self.ipr['index']
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self.ifname = self.ipr.get_attr('IFLA_IFNAME')
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self.kind = self.ipr.get_attr('IFLA_LINKINFO').get_attr('IFLA_INFO_KIND') if self.ipr.get_attr('IFLA_LINKINFO') else None
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self.address = self.ipr.get_attr('IFLA_ADDRESS')
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self.netns = None
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self.ipaddr = []
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for address in iproute.get_addr(label=self.ipr.get_attr('IFLA_IFNAME')):
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ipaddress = {}
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ipaddress['address'] = address.get_attr('IFA_ADDRESS')
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ipaddress['prefixlen'] = address['prefixlen']
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self.ipaddr.append(ipaddress)
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self.routes = []
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for r in iproute.get_routes():
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attrs = dict(r['attrs'])
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if attrs['RTA_OIF'] == self['index']:
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if 'RTA_PRIORITY' in attrs and not attrs['RTA_PRIORITY'] < 255:
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continue
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route = {}
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route['type'] = r['type']
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route['family'] = r['family']
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route['dst'] = attrs['RTA_DST'] if 'RTA_DST' in attrs else ''
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route['gateway'] = attrs['RTA_GATEWAY'] if 'RTA_GATEWAY' in attrs else None
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route['dst_len'] = r['dst_len']
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self.routes.append(route)
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def up(self):
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if self.ndb:
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self.ndb.set('state', 'up').commit()
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elif self.ipr:
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iproute.link("set", index=self.index, state="up")
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def down(self):
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if self.ndb:
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self.ndb.set('state', 'down').commit()
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elif self.ipr:
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iproute.link("set", index=self.index, state="down")
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def CreateInterface(library, ifname, kind, peer):
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try:
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if library == 'NDB':
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ndb.interfaces.create(ifname=ifname, kind=kind, peer=peer).commit()
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return Interface(ndb.interfaces[ifname])
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elif library == 'IPR':
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iproute.link("add", ifname=ifname, kind=kind, peer=peer)
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return Interface(iproute.get_links(ifname=ifname)[0])
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return None
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except Exception as e:
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return None
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def RemoveInterface(library, ifname):
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try:
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if library == 'NDB':
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ndb.interfaces[ifname].remove().commit()
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elif library == 'IPR':
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iproute.link("del", index=iproute.link_lookup(ifname=ifname)[0])
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except Exception as e:
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return
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def AddPort(library, bridge, ifname):
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try:
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if library == 'NDB':
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ndb.interfaces[bridge].add_port(ifname).commit()
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elif library == 'IPR':
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iproute.link("set", index=iproute.link_lookup(ifname=ifname)[0], master=iproute.link_lookup(ifname=bridge)[0])
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except Exception as e:
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return
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def DelPort(library, bridge, ifname):
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try:
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if library == 'NDB':
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ndb.interfaces[bridge].del_port(ifname).commit()
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elif library == 'IPR':
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iproute.link("set", index=iproute.link_lookup(ifname=ifname)[0], master=0)
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except Exception as e:
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return
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#-------------------------------
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def test_Variable(v1, v2, f):
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assert v1 == v2, "{} not equal ({}, {})".format(f, v1, v2)
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def test_Interface():
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itf1 = GetInterface('NDB', 'br0')
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itf2 = GetInterface('IPR', 'br0')
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test_Variable(itf1.ifname, itf2.ifname, 'ifname')
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test_Variable(itf1.kind, itf2.kind, 'kind')
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test_Variable(itf1.ipaddr(), itf2.ipaddr(), 'ipaddr')
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test_Variable(itf1.routes, itf2.routes, 'routes')
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print("OK")
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#test_Interface()
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def test_CreateInterface():
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CreateInterface('NDB', 'ndb0', 'veth', 'ndb1')
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CreateInterface('IPR', 'ipr0', 'veth', 'ipr1')
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itf1 = GetInterface('NDB', 'ndb0')
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itf2 = GetInterface('IPR', 'ipr0')
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itf1.up();
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itf2.up();
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itf3 = GetInterface('NDB', 'ndb1')
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itf4 = GetInterface('IPR', 'ipr1')
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itf3.up();
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itf4.up();
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AddPort('NDB', 'br0', 'ndb0')
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AddPort('IPR', 'br0', 'ipr0')
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#test_CreateInterface()
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def test_RemoveInterface():
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DelPort('NDB', 'br0', 'ndb0')
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DelPort('IPR', 'br0', 'ipr0')
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RemoveInterface('NDB', 'ndb0')
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RemoveInterface('IPR', 'ipr0')
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#test_RemoveInterface()
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@@ -0,0 +1,388 @@
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import itertools
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import ipaddress
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import logging
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import atexit
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import socket
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import time
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import threading
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import subprocess
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import pyroute2
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from pyroute2.netlink.rtnl import rtypes
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import docker
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from flask import request, jsonify
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from . import interface
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from . import NetDhcpError, udhcpc, app
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LIBRARY = 'IPR'
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OPTS_KEY = 'com.docker.network.generic'
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OPT_BRIDGE = 'bridge'
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OPT_IPV6 = 'ipv6'
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logger = logging.getLogger('net-dhcp')
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interface.InitializeLibrary(LIBRARY)
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client = docker.from_env()
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@atexit.register
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def close_docker():
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client.close()
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gateway_hints = {}
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container_dhcp_clients = {}
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@atexit.register
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def cleanup_dhcp():
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for endpoint, dhcp in container_dhcp_clients.items():
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logger.warning('cleaning up orphaned container DHCP client (endpoint "%s")', endpoint)
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dhcp.stop()
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def veth_pair(e):
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return f'dh-{e[:12]}', f'{e[:12]}-dh'
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def iface_addrs(iface):
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return list(map(lambda a: ipaddress.ip_interface((a['address'], a['prefixlen'])), iface.ipaddr))
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def iface_nets(iface):
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return list(map(lambda n: n.network, iface_addrs(iface)))
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def get_bridges():
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reserved_nets = set(map(ipaddress.ip_network, map(lambda c: c['Subnet'], \
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itertools.chain.from_iterable(map(lambda i: i['Config'], filter(lambda i: i['Driver'] != 'net-dhcp', \
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map(lambda n: n.attrs['IPAM'], client.networks.list())))))))
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return dict(map(lambda i: (i['ifname'], i), filter(lambda i: i['kind'] == 'bridge' and not \
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set(iface_nets(i)).intersection(reserved_nets), map(lambda i: interface.GetInterface(LIBRARY, i['ifname']), \
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interface.GetInterfaces(LIBRARY)))))
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def net_bridge(n):
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return interface.GetInterface(LIBRARY, client.networks.get(n).attrs['Options'][OPT_BRIDGE])
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def ipv6_enabled(n):
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options = client.networks.get(n).attrs['Options']
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return OPT_IPV6 in options and options[OPT_IPV6] == 'true'
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def endpoint_container_iface(n, e):
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for cid, info in client.networks.get(n).attrs['Containers'].items():
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if info['EndpointID'] == e:
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container = client.containers.get(cid)
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netns = f'/proc/{container.attrs["State"]["Pid"]}/ns/net'
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with pyroute2.NetNS(netns) as rtnl:
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for link in rtnl.get_links():
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attrs = dict(link['attrs'])
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if attrs['IFLA_ADDRESS'] == info['MacAddress']:
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return {
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'netns': netns,
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'ifname': attrs['IFLA_IFNAME'],
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'address': attrs['IFLA_ADDRESS']
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}
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break
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return None
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def await_endpoint_container_iface(n, e, timeout=5):
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start = time.time()
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iface = None
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while time.time() - start < timeout:
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try:
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iface = endpoint_container_iface(n, e)
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except docker.errors.NotFound:
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time.sleep(0.5)
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if not iface:
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raise NetDhcpError('Timed out waiting for container to become availabile')
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return iface
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def endpoint_container_hostname(n, e):
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for cid, info in client.networks.get(n).attrs['Containers'].items():
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if info['EndpointID'] == e:
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return client.containers.get(cid).attrs['Config']['Hostname']
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return None
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@app.route('/NetworkDriver.GetCapabilities', methods=['POST'])
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def net_get_capabilities():
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return jsonify({
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'Scope': 'local',
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'ConnectivityScope': 'global'
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})
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@app.route('/NetworkDriver.CreateNetwork', methods=['POST'])
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def create_net():
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req = request.get_json(force=True)
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for data in req['IPv4Data']:
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if data['AddressSpace'] != 'null' or data['Pool'] != '0.0.0.0/0':
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return jsonify({'Err': 'Only the null IPAM driver is supported'}), 400
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options = req['Options'][OPTS_KEY]
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if OPT_BRIDGE not in options:
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return jsonify({'Err': 'No bridge provided'}), 400
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# We have to use a custom "enable IPv6" option because Docker's null IPAM driver doesn't support IPv6 and a plugin
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# IPAM driver isn't allowed to return an empty address
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if OPT_IPV6 in options and options[OPT_IPV6] not in ('', 'true', 'false'):
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return jsonify({'Err': 'Invalid boolean value for ipv6'}), 400
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desired = options[OPT_BRIDGE]
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bridges = get_bridges()
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if desired not in bridges:
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return jsonify({'Err': f'Bridge "{desired}" not found (or the specified bridge is already used by Docker)'}), 400
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logger.info('Creating network "%s" (using bridge "%s")', req['NetworkID'], desired)
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return jsonify({})
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@app.route('/NetworkDriver.DeleteNetwork', methods=['POST'])
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def delete_net():
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return jsonify({})
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@app.route('/NetworkDriver.CreateEndpoint', methods=['POST'])
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def create_endpoint():
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req = request.get_json(force=True)
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network_id = req['NetworkID']
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endpoint_id = req['EndpointID']
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req_iface = req['Interface']
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bridge = net_bridge(network_id)
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bridge_addrs = iface_addrs(bridge)
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if_host, if_container = veth_pair(endpoint_id)
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logger.info('creating veth pair %s <=> %s', if_host, if_container)
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if_host = interface.CreateInterface(LIBRARY, if_host, 'veth', if_container)
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if_host.up()
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try:
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start = time.time()
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while isinstance(if_container, str) and time.time() - start < 10:
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try:
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if_container = interface.GetInterface(LIBRARY, if_container)
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if_container.up()
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except KeyError:
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time.sleep(0.5)
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if isinstance(if_container, str):
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raise NetDhcpError(f'timed out waiting for {if_container} to appear in host')
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interface.AddPort(LIBRARY, bridge.ifname, if_host.ifname)
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res_iface = {
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'MacAddress': '',
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'Address': '',
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'AddressIPv6': ''
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}
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# !!!
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# if 'MacAddress' in req_iface and req_iface['MacAddress']:
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# (if_container
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# .set('address', req_iface['MacAddress'])
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# .commit())
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# else:
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# res_iface['MacAddress'] = if_container['address']
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# !!!
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res_iface['MacAddress'] = if_container['address']
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def try_addr(type_):
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addr = None
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k = 'AddressIPv6' if type_ == 'v6' else 'Address'
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if k in req_iface and req_iface[k]:
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# TODO: Should we allow static IP's somehow?
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# Just validate the address, Docker will add it to the interface for us
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#addr = ipaddress.ip_interface(req_iface[k])
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#for bridge_addr in bridge_addrs:
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# if addr.ip == bridge_addr.ip:
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# raise NetDhcpError(400, f'Address {addr} is already in use on bridge {bridge["ifname"]}')
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raise NetDhcpError('Only the null IPAM driver is supported')
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else:
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dhcp = udhcpc.DHCPClient(if_container, v6=type_ == 'v6', once=True)
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addr = dhcp.finish()
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if not addr:
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return
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res_iface[k] = str(addr)
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if dhcp.gateway:
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gateway_hints[endpoint_id] = dhcp.gateway
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logger.info('Adding IP%s address %s to %s', type_, addr, if_container['ifname'])
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try_addr('v4')
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if ipv6_enabled(network_id):
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try_addr('v6')
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||||
res = jsonify({
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||||
'Interface': res_iface
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||||
})
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||||
except Exception as e:
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logger.exception(e)
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||||
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||||
if not isinstance(if_container, str):
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interface.DelPort(LIBRARY, bridge.ifname, if_host.ifname)
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interface.RemoveInterface(LIBRARY, if_host.ifname)
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||||
if isinstance(e, NetDhcpError):
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res = jsonify({'Err': str(e)}), e.status
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||||
else:
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res = jsonify({'Err': str(e)}), 500
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finally:
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||||
return res
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||||
|
||||
@app.route('/NetworkDriver.EndpointOperInfo', methods=['POST'])
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def endpoint_info():
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||||
req = request.get_json(force=True)
|
||||
|
||||
bridge = net_bridge(req['NetworkID'])
|
||||
if_host, _if_container = veth_pair(req['EndpointID'])
|
||||
if_host = interface.GetInterface(LIBRARY, if_host)
|
||||
|
||||
return jsonify({
|
||||
'bridge': bridge['ifname'],
|
||||
'if_host': {
|
||||
'name': if_host['ifname'],
|
||||
'mac': if_host['address']
|
||||
}
|
||||
})
|
||||
|
||||
@app.route('/NetworkDriver.DeleteEndpoint', methods=['POST'])
|
||||
def delete_endpoint():
|
||||
req = request.get_json(force=True)
|
||||
|
||||
bridge = net_bridge(req['NetworkID'])
|
||||
if_host, _if_container = veth_pair(req['EndpointID'])
|
||||
if_host = interface.GetInterface(LIBRARY, if_host)
|
||||
|
||||
interface.DelPort(LIBRARY, bridge.ifname, if_host.ifname)
|
||||
interface.RemoveInterface(LIBRARY, if_host.ifname)
|
||||
|
||||
return jsonify({})
|
||||
|
||||
@app.route('/NetworkDriver.Join', methods=['POST'])
|
||||
def join():
|
||||
req = request.get_json(force=True)
|
||||
network = req['NetworkID']
|
||||
endpoint = req['EndpointID']
|
||||
|
||||
bridge = net_bridge(req['NetworkID'])
|
||||
_if_host, if_container = veth_pair(req['EndpointID'])
|
||||
|
||||
res = {
|
||||
'InterfaceName': {
|
||||
'SrcName': if_container,
|
||||
'DstPrefix': bridge['ifname']
|
||||
},
|
||||
'StaticRoutes': []
|
||||
}
|
||||
|
||||
if endpoint in gateway_hints:
|
||||
gateway = gateway_hints[endpoint]
|
||||
logger.info('Setting IPv4 gateway from DHCP (%s)', gateway)
|
||||
res['Gateway'] = str(gateway)
|
||||
del gateway_hints[endpoint]
|
||||
|
||||
ipv6 = ipv6_enabled(network)
|
||||
for route in bridge.routes:
|
||||
if route['type'] != rtypes['RTN_UNICAST'] or \
|
||||
(route['family'] == socket.AF_INET6 and not ipv6):
|
||||
continue
|
||||
|
||||
if route['dst'] in ('', '/0'):
|
||||
if route['family'] == socket.AF_INET and 'Gateway' not in res:
|
||||
logger.info('Adding IPv4 gateway %s', route['gateway'])
|
||||
res['Gateway'] = route['gateway']
|
||||
elif route['family'] == socket.AF_INET6 and 'GatewayIPv6' not in res:
|
||||
logger.info('Adding IPv6 gateway %s', route['gateway'])
|
||||
res['GatewayIPv6'] = route['gateway']
|
||||
elif route['gateway']:
|
||||
dst = f'{route["dst"]}/{route["dst_len"]}'
|
||||
logger.info('Adding route to %s via %s', dst, route['gateway'])
|
||||
res['StaticRoutes'].append({
|
||||
'Destination': dst,
|
||||
'RouteType': 0,
|
||||
'NextHop': route['gateway']
|
||||
})
|
||||
|
||||
container_dhcp_clients[endpoint] = ContainerDHCPManager(network, endpoint)
|
||||
return jsonify(res)
|
||||
|
||||
@app.route('/NetworkDriver.Leave', methods=['POST'])
|
||||
def leave():
|
||||
req = request.get_json(force=True)
|
||||
endpoint = req['EndpointID']
|
||||
|
||||
if endpoint in container_dhcp_clients:
|
||||
container_dhcp_clients[endpoint].stop()
|
||||
del container_dhcp_clients[endpoint]
|
||||
|
||||
return jsonify({})
|
||||
|
||||
# Trying to grab the container's attributes (to get the network namespace)
|
||||
# will deadlock (since Docker is waiting on us), so we must defer starting
|
||||
# the DHCP client
|
||||
class ContainerDHCPManager:
|
||||
def __init__(self, network, endpoint):
|
||||
self.network = network
|
||||
self.endpoint = endpoint
|
||||
self.ipv6 = ipv6_enabled(network)
|
||||
|
||||
self.dhcp = None
|
||||
self.dhcp6 = None
|
||||
self._thread = threading.Thread(target=self.run)
|
||||
self._thread.start()
|
||||
|
||||
def _on_event(self, dhcp, event_type, _event):
|
||||
if event_type != udhcpc.EventType.RENEW or not dhcp.gateway:
|
||||
return
|
||||
|
||||
logger.info('[dhcp container] Replacing gateway with %s', dhcp.gateway)
|
||||
subprocess.check_call(['nsenter', f'-n{dhcp.netns}', '--', '/sbin/ip', 'route', 'replace', 'default', 'via',
|
||||
str(dhcp.gateway)], timeout=1, stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL,
|
||||
stderr=subprocess.DEVNULL)
|
||||
|
||||
# TODO: Adding default route with NDB seems to be broken (because of the dst syntax?)
|
||||
#for route in ndb.routes:
|
||||
# if route['type'] != rtypes['RTN_UNICAST'] or \
|
||||
# route['oif'] != dhcp.iface['index'] or \
|
||||
# (route['family'] == socket.AF_INET6 and not self.ipv6) or \
|
||||
# route['dst'] not in ('', '/0'):
|
||||
# continue
|
||||
|
||||
# # Needed because Route.remove() doesn't like a blank destination
|
||||
# logger.info('Removing default route via %s', route['gateway'])
|
||||
# route['dst'] = '::' if route['family'] == socket.AF_INET6 else '0.0.0.0'
|
||||
# (route
|
||||
# .remove()
|
||||
# .commit())
|
||||
|
||||
#logger.info('Adding default route via %s', dhcp.gateway)
|
||||
#(ndb.routes.add({'oif': dhcp.iface['index'], 'gateway': dhcp.gateway})
|
||||
# .commit())
|
||||
|
||||
def run(self):
|
||||
try:
|
||||
iface = await_endpoint_container_iface(self.network, self.endpoint)
|
||||
hostname = endpoint_container_hostname(self.network, self.endpoint)
|
||||
|
||||
self.dhcp = udhcpc.DHCPClient(iface, event_listener=self._on_event, hostname=hostname)
|
||||
logger.info('Starting DHCPv4 client on %s in container namespace %s', iface['ifname'], \
|
||||
self.dhcp.netns)
|
||||
|
||||
if self.ipv6:
|
||||
self.dhcp6 = udhcpc.DHCPClient(iface, v6=True, event_listener=self._on_event, hostname=hostname)
|
||||
logger.info('Starting DHCPv6 client on %s in container namespace %s', iface['ifname'], \
|
||||
self.dhcp6.netns)
|
||||
except Exception as e:
|
||||
logger.exception(e)
|
||||
if self.dhcp:
|
||||
self.dhcp.finish(timeout=1)
|
||||
|
||||
def stop(self):
|
||||
if not self.dhcp:
|
||||
return
|
||||
|
||||
try:
|
||||
logger.info('Shutting down DHCPv4 client on %s in container namespace %s', \
|
||||
self.dhcp.iface['ifname'], self.dhcp.netns)
|
||||
self.dhcp.finish(timeout=1)
|
||||
finally:
|
||||
try:
|
||||
if self.ipv6:
|
||||
logger.info('Shutting down DHCPv6 client on %s in container namespace %s', \
|
||||
self.dhcp6.iface['ifname'], self.dhcp.netns)
|
||||
self.dhcp6.finish(timeout=1)
|
||||
finally:
|
||||
self._thread.join()
|
||||
|
||||
# we have to do this since the docker client leaks sockets...
|
||||
global client
|
||||
client.close()
|
||||
client = docker.from_env()
|
||||
@@ -0,0 +1,148 @@
|
||||
from enum import Enum
|
||||
import ipaddress
|
||||
import json
|
||||
import struct
|
||||
import binascii
|
||||
import os
|
||||
from os import path
|
||||
from select import select
|
||||
import threading
|
||||
import subprocess
|
||||
import logging
|
||||
|
||||
from eventfd import EventFD
|
||||
import posix_ipc
|
||||
|
||||
HANDLER_SCRIPT = path.join(path.dirname(__file__), 'udhcpc_handler.py')
|
||||
AWAIT_INTERVAL = 0.1
|
||||
VENDOR_ID = 'docker'
|
||||
|
||||
class EventType(Enum):
|
||||
BOUND = 'bound'
|
||||
RENEW = 'renew'
|
||||
DECONFIG = 'deconfig'
|
||||
LEASEFAIL = 'leasefail'
|
||||
|
||||
logger = logging.getLogger('net-dhcp')
|
||||
|
||||
class DHCPClientError(Exception):
|
||||
pass
|
||||
|
||||
def _nspopen_wrapper(netns):
|
||||
return lambda cmd, *args, **kwargs: subprocess.Popen(['nsenter', f'-n{netns}', '--'] + cmd, *args, **kwargs)
|
||||
class DHCPClient:
|
||||
def __init__(self, iface, v6=False, once=False, hostname=None, event_listener=None):
|
||||
self.iface = iface
|
||||
self.v6 = v6
|
||||
self.once = once
|
||||
self.event_listeners = [DHCPClient._attr_listener]
|
||||
if event_listener:
|
||||
self.event_listeners.append(event_listener)
|
||||
|
||||
self.netns = None
|
||||
if isinstance(iface, dict):
|
||||
self.netns = iface['netns']
|
||||
logger.debug('udhcpc using netns %s', self.netns)
|
||||
|
||||
Popen = _nspopen_wrapper(self.netns) if self.netns else subprocess.Popen
|
||||
bin_path = '/usr/bin/udhcpc6' if v6 else '/sbin/udhcpc'
|
||||
cmdline = [bin_path, '-s', HANDLER_SCRIPT, '-i', iface['ifname'], '-f']
|
||||
cmdline.append('-q' if once else '-R')
|
||||
if hostname:
|
||||
cmdline.append('-x')
|
||||
if v6:
|
||||
# TODO: We encode the fqdn for DHCPv6 because udhcpc6 seems to be broken
|
||||
# flags: S bit set (see RFC4704)
|
||||
enc_hostname = hostname.encode('utf-8')
|
||||
enc_hostname = struct.pack('BB', 0b0001, len(enc_hostname)) + enc_hostname
|
||||
enc_hostname = binascii.hexlify(enc_hostname).decode('ascii')
|
||||
hostname_opt = f'0x27:{enc_hostname}'
|
||||
else:
|
||||
hostname_opt = f'hostname:{hostname}'
|
||||
cmdline.append(hostname_opt)
|
||||
if not v6:
|
||||
cmdline += ['-V', VENDOR_ID]
|
||||
|
||||
self._suffix = '6' if v6 else ''
|
||||
self._event_queue = posix_ipc.MessageQueue(f'/udhcpc{self._suffix}_{iface["address"].replace(":", "_")}', \
|
||||
flags=os.O_CREAT | os.O_EXCL, max_messages=2, max_message_size=1024)
|
||||
self.proc = Popen(cmdline, env={'EVENT_QUEUE': self._event_queue.name}, stdin=subprocess.DEVNULL,
|
||||
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
|
||||
if hostname:
|
||||
logger.debug('[udhcpc%s#%d] using hostname "%s"', self._suffix, self.proc.pid, hostname)
|
||||
|
||||
self._has_lease = threading.Event()
|
||||
self.ip = None
|
||||
self.gateway = None
|
||||
self.domain = None
|
||||
|
||||
self._shutdown_event = EventFD()
|
||||
self.shutdown = False
|
||||
self._event_thread = threading.Thread(target=self._read_events)
|
||||
self._event_thread.start()
|
||||
|
||||
def _attr_listener(self, event_type, event):
|
||||
if event_type in (EventType.BOUND, EventType.RENEW):
|
||||
self.ip = ipaddress.ip_interface(event['ip'])
|
||||
if 'gateway' in event:
|
||||
self.gateway = ipaddress.ip_address(event['gateway'])
|
||||
else:
|
||||
self.gateway = None
|
||||
self.domain = event.get('domain')
|
||||
self._has_lease.set()
|
||||
elif event_type == EventType.DECONFIG:
|
||||
self._has_lease.clear()
|
||||
self.ip = None
|
||||
self.gateway = None
|
||||
self.domain = None
|
||||
|
||||
def _read_events(self):
|
||||
while True:
|
||||
r, _w, _e = select([self._shutdown_event, self._event_queue.mqd], [], [])
|
||||
if self._shutdown_event in r:
|
||||
break
|
||||
|
||||
msg, _priority = self._event_queue.receive()
|
||||
event = json.loads(msg.decode('utf-8'))
|
||||
try:
|
||||
event['type'] = EventType(event['type'])
|
||||
except ValueError:
|
||||
logger.warning('udhcpc%s#%d unknown event "%s"', self._suffix, self.proc.pid, event)
|
||||
continue
|
||||
|
||||
logger.debug('[udhcp%s#%d event] %s', self._suffix, self.proc.pid, event)
|
||||
for listener in self.event_listeners:
|
||||
try:
|
||||
listener(self, event['type'], event)
|
||||
except Exception as ex:
|
||||
logger.exception(ex)
|
||||
self.shutdown = True
|
||||
del self._shutdown_event
|
||||
|
||||
def await_ip(self, timeout=10):
|
||||
if not self._has_lease.wait(timeout=timeout):
|
||||
raise DHCPClientError(f'Timed out waiting for lease from udhcpc{self._suffix}')
|
||||
|
||||
return self.ip
|
||||
|
||||
def finish(self, timeout=5):
|
||||
if self.shutdown or self._shutdown_event.is_set():
|
||||
return
|
||||
|
||||
try:
|
||||
if self.proc.returncode is not None and (not self.once or self.proc.returncode != 0):
|
||||
raise DHCPClientError(f'udhcpc{self._suffix} exited early with code {self.proc.returncode}')
|
||||
if self.once:
|
||||
self.await_ip()
|
||||
else:
|
||||
self.proc.terminate()
|
||||
|
||||
if self.proc.wait(timeout=timeout) != 0:
|
||||
raise DHCPClientError(f'udhcpc{self._suffix} exited with non-zero exit code {self.proc.returncode}')
|
||||
|
||||
return self.ip
|
||||
finally:
|
||||
self._shutdown_event.set()
|
||||
self._event_thread.join()
|
||||
self._event_queue.close()
|
||||
self._event_queue.unlink()
|
||||
Executable
+29
@@ -0,0 +1,29 @@
|
||||
#!/usr/bin/env python
|
||||
import json
|
||||
import sys
|
||||
from os import environ as env
|
||||
|
||||
import posix_ipc
|
||||
|
||||
if __name__ != '__main__':
|
||||
print('You shouldn\'t be importing this script!')
|
||||
sys.exit(1)
|
||||
|
||||
event = {'type': sys.argv[1]}
|
||||
if event['type'] in ('bound', 'renew'):
|
||||
if 'ipv6' in env:
|
||||
event['ip'] = env['ipv6']
|
||||
else:
|
||||
event['ip'] = f'{env["ip"]}/{env["mask"]}'
|
||||
if 'router' in env:
|
||||
event['gateway'] = env['router']
|
||||
if 'domain' in env:
|
||||
event['domain'] = env['domain']
|
||||
elif event['type'] in ('deconfig', 'leasefail', 'nak'):
|
||||
pass
|
||||
else:
|
||||
event['type'] = 'unknown'
|
||||
|
||||
queue = posix_ipc.MessageQueue(env['EVENT_QUEUE'])
|
||||
queue.send(json.dumps(event))
|
||||
queue.close()
|
||||
Reference in New Issue
Block a user