7 import twisted.internet
8 import twisted.internet.endpoints
9 from twisted.internet import reactor
10 from twisted.web.server import NOT_DONE_YET
11 from twisted.logger import LogLevel
14 from ipaddress import AddressValueError
16 #import twisted.web.server import Site
17 #from twisted.web.resource import Resource
19 from optparse import OptionParser
20 from configparser import ConfigParser
21 from configparser import NoOptionError
31 r = ipaddress.IPv4Address(input)
32 except AddressValueError:
33 r = ipaddress.IPv6Address(input)
38 r = ipaddress.IPv4Network(input)
39 except NetworkValueError:
40 r = ipaddress.IPv6Network(input)
45 max_batch_down = 65536
56 ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s
61 max_batch_down = 262144
63 max_request_time = 121
66 #---------- "router" ----------
68 def route(packet, saddr, daddr):
69 print('TRACE ', saddr, daddr, packet)
70 try: client = clients[daddr]
71 except KeyError: dclient = None
72 if dclient is not None:
73 dclient.queue_outbound(packet)
74 elif saddr.is_link_local or daddr.is_link_local:
75 log_discard(packet, saddr, daddr, 'link-local')
76 elif daddr == host or daddr not in network:
77 print('TRACE INBOUND ', saddr, daddr, packet)
80 log_discard(packet, saddr, daddr, 'relay')
82 log_discard(packet, saddr, daddr, 'no client')
84 def log_discard(packet, saddr, daddr, why):
85 print('DROP ', saddr, daddr, why)
86 # syslog.syslog(syslog.LOG_DEBUG,
87 # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why))
89 #---------- ipif (slip subprocess) ----------
91 class IpifProcessProtocol(twisted.internet.protocol.ProcessProtocol):
94 def connectionMade(self): pass
95 def outReceived(self, data):
96 #print('RECV ', repr(data))
98 packets = slip_decode(self._buffer)
99 self._buffer = packets.pop()
100 for packet in packets:
101 if not len(packet): continue
102 (saddr, daddr) = packet_addrs(packet)
103 route(packet, saddr, daddr)
104 def processEnded(self, status):
105 status.raiseException()
109 ipif = IpifProcessProtocol()
110 reactor.spawnProcess(ipif,
111 '/bin/sh',['sh','-xc', ipif_command],
112 childFDs={0:'w', 1:'r', 2:2})
114 def queue_inbound(packet):
115 ipif.transport.write(slip_delimiter)
116 ipif.transport.write(slip_encode(packet))
117 ipif.transport.write(slip_delimiter)
119 #---------- SLIP handling ----------
123 slip_esc_end = b'\334'
124 slip_esc_esc = b'\335'
125 slip_delimiter = slip_end
127 def slip_encode(packet):
129 .replace(slip_esc, slip_esc + slip_esc_esc)
130 .replace(slip_end, slip_esc + slip_esc_end))
132 def slip_decode(data):
133 print('DECODE ', repr(data))
135 for packet in data.split(slip_end):
138 eix = packet.find(slip_esc)
142 #print('ESC ', repr((pdata, packet, eix)))
143 pdata += packet[0 : eix]
145 if ck == slip_esc_esc: pdata += slip_esc
146 elif ck == slip_esc_end: pdata += slip_end
147 else: raise ValueError('invalid SLIP escape')
148 packet = packet[eix+2 : ]
150 print('DECODED ', repr(out))
153 #---------- packet parsing ----------
155 def packet_addrs(packet):
156 version = packet[0] >> 4
160 factory = ipaddress.IPv4Address
164 factory = ipaddress.IPv6Address
166 raise ValueError('unsupported IP version %d' % version)
167 saddr = factory(packet[ saddroff : saddroff + addrlen ])
168 daddr = factory(packet[ saddroff + addrlen : saddroff + addrlen*2 ])
169 return (saddr, daddr)
171 #---------- client ----------
174 def __init__(self, ip, cs):
175 # instance data members
178 self.pw = cfg.get(cs, 'password')
179 self._rq = collections.deque() # requests
180 self._pq = collections.deque() # packets
185 for k in ('max_batch_down','max_queue_time','max_request_time'):
186 req = cfg.getint(cs, k)
187 limit = cfg.getint('limits',k)
188 self.__dict__[k] = min(req, limit)
190 def process_arriving_data(self, d):
191 for packet in slip_decode(d):
192 (saddr, daddr) = packet_addrs(packet)
193 if saddr != self._ip:
194 raise ValueError('wrong source address %s' % saddr)
195 route(packet, saddr, daddr)
197 def _req_cancel(self, request):
200 def _req_error(self, err, request):
201 self._req_cancel(request)
203 def queue_outbound(self, packet):
204 self._pq.append((time.monotonic(), packet))
206 def http_request(self, request):
207 request.setHeader('Content-Type','application/octet-stream')
208 reactor.callLater(self.max_request_time, self._req_cancel, request)
209 request.notifyFinish().addErrback(self._req_error, request)
210 self._rq.append(request)
211 self._check_outbound()
213 def _check_outbound(self):
215 try: request = self._rq[0]
216 except IndexError: request = None
217 if request and request.finished:
221 # now request is an unfinished request, or None
222 try: (queuetime, packet) = self._pq[0]
224 # no packets, oh well
227 age = time.monotonic() - queuetime
228 if age > self.max_queue_time:
236 # request, and also some non-expired packets
238 try: (dummy, packet) = self._pq[0]
239 except IndexError: break
241 encoded = slip_encode(packet)
243 if request.sentLength > 0:
244 if (request.sentLength + len(slip_delimiter)
245 + len(encoded) > self.max_batch_down):
247 request.write(slip_delimiter)
249 request.write(encoded)
252 assert(request.sentLength)
255 # round again, looking for more to do
257 class IphttpResource(twisted.web.resource.Resource):
258 def render_POST(self, request):
259 # find client, update config, etc.
260 ci = ipaddr(request.args['i'])
262 pw = request.args['pw']
263 if pw != c.pw: raise ValueError('bad password')
266 for r, w in (('mbd', 'max_batch_down'),
267 ('mqt', 'max_queue_time'),
268 ('mrt', 'max_request_time')):
269 try: v = request.args[r]
270 except KeyError: continue
274 try: d = request.args['d']
275 except KeyError: d = ''
277 c.process_arriving_data(d)
278 c.new_request(request)
281 resource = IphttpResource()
282 sitefactory = twisted.web.server.Site(resource)
283 for addrspec in cfg.get('server','addrs').split():
285 addr = ipaddress.IPv4Address(addrspec)
286 endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint
287 except AddressValueError:
288 addr = ipaddress.IPv6Address(addrspec)
289 endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint
290 ep = endpointfactory(reactor, cfg.getint('server','port'), addr)
291 defer = ep.listen(sitefactory)
292 defer.addErrback(lambda err: err.raiseException())
294 #---------- config and setup ----------
302 network = ipnetwork(cfg.get('virtual','network'))
303 if network.num_addresses < 3 + 2:
304 raise ValueError('network needs at least 2^3 addresses')
307 host = cfg.get('virtual','host')
308 except NoOptionError:
309 host = next(network.hosts())
312 relay = cfg.get('virtual','relay')
313 except NoOptionError:
314 for search in network.hosts():
315 if search == host: continue
319 for cs in cfg.sections():
320 if not (':' in cs or '.' in cs): continue
322 if ci not in network:
323 raise ValueError('client %s not in network' % ci)
325 raise ValueError('multiple client cfg sections for %s' % ci)
326 clients[ci] = Client(ci, cs)
329 mtu = cfg.get('virtual','mtu')
332 for k in ('host','relay','mtu','network'):
333 iic_vars[k] = globals()[k]
335 ipif_command = cfg.get('server','ipif', vars=iic_vars)
337 def crash_on_critical(event):
338 if event.get('log_level') >= LogLevel.critical:
339 print('crashing: ', twisted.logger.formatEvent(event), file=sys.stderr)
340 #print('crashing!', file=sys.stderr)
343 except twisted.internet.error.ReactorNotRunning: pass
349 op.add_option('-c', '--config', dest='configfile',
350 default='/etc/hippottd/server.conf')
352 (opts, args) = op.parse_args()
353 if len(args): op.error('no non-option arguments please')
355 twisted.logger.globalLogPublisher.addObserver(crash_on_critical)
358 cfg.read_string(defcfg)
359 cfg.read(opts.configfile)