4 signal.signal(signal.SIGINT, signal.SIG_DFL)
10 import twisted.internet
11 import twisted.internet.endpoints
12 from twisted.internet import reactor
13 from twisted.web.server import NOT_DONE_YET
14 from twisted.logger import LogLevel
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
27 from hippotit import *
33 max_batch_down = 65536
44 ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s
49 max_batch_down = 262144
51 max_request_time = 121
54 #---------- error handling ----------
57 print('CRASH ', err, file=sys.stderr)
59 except twisted.internet.error.ReactorNotRunning: pass
61 def crash_on_defer(defer):
62 defer.addErrback(lambda err: crash(err))
64 def crash_on_critical(event):
65 if event.get('log_level') >= LogLevel.critical:
66 crash(twisted.logger.formatEvent(event))
68 #---------- "router" ----------
70 def route(packet, saddr, daddr):
71 print('TRACE ', saddr, daddr, packet)
72 try: client = clients[daddr]
73 except KeyError: dclient = None
74 if dclient is not None:
75 dclient.queue_outbound(packet)
76 elif saddr.is_link_local or daddr.is_link_local:
77 log_discard(packet, saddr, daddr, 'link-local')
78 elif daddr == host or daddr not in network:
79 print('TRACE INBOUND ', saddr, daddr, packet)
82 log_discard(packet, saddr, daddr, 'relay')
84 log_discard(packet, saddr, daddr, 'no client')
86 def log_discard(packet, saddr, daddr, why):
87 print('DROP ', saddr, daddr, why)
88 # syslog.syslog(syslog.LOG_DEBUG,
89 # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why))
91 #---------- ipif (slip subprocess) ----------
93 class IpifProcessProtocol(twisted.internet.protocol.ProcessProtocol):
96 def connectionMade(self): pass
97 def outReceived(self, data):
98 #print('RECV ', repr(data))
100 packets = slip.decode(self._buffer)
101 self._buffer = packets.pop()
102 for packet in packets:
103 if not len(packet): continue
104 (saddr, daddr) = packet_addrs(packet)
105 route(packet, saddr, daddr)
106 def processEnded(self, status):
107 status.raiseException()
111 ipif = IpifProcessProtocol()
112 reactor.spawnProcess(ipif,
113 '/bin/sh',['sh','-xc', ipif_command],
114 childFDs={0:'w', 1:'r', 2:2})
116 def queue_inbound(packet):
117 ipif.transport.write(slip.delimiter)
118 ipif.transport.write(slip.encode(packet))
119 ipif.transport.write(slip.delimiter)
121 #---------- client ----------
124 def __init__(self, ip, cs):
125 # instance data members
128 self.pw = cfg.get(cs, 'password')
129 self._rq = collections.deque() # requests
130 self._pq = collections.deque() # packets
135 for k in ('max_batch_down','max_queue_time','max_request_time'):
136 req = cfg.getint(cs, k)
137 limit = cfg.getint('limits',k)
138 self.__dict__[k] = min(req, limit)
140 def process_arriving_data(self, d):
141 for packet in slip.decode(d):
142 (saddr, daddr) = packet_addrs(packet)
143 if saddr != self._ip:
144 raise ValueError('wrong source address %s' % saddr)
145 route(packet, saddr, daddr)
147 def _req_cancel(self, request):
150 def _req_error(self, err, request):
151 self._req_cancel(request)
153 def queue_outbound(self, packet):
154 self._pq.append((time.monotonic(), packet))
156 def http_request(self, request):
157 request.setHeader('Content-Type','application/octet-stream')
158 reactor.callLater(self.max_request_time, self._req_cancel, request)
159 request.notifyFinish().addErrback(self._req_error, request)
160 self._rq.append(request)
161 self._check_outbound()
163 def _check_outbound(self):
165 try: request = self._rq[0]
166 except IndexError: request = None
167 if request and request.finished:
171 # now request is an unfinished request, or None
172 try: (queuetime, packet) = self._pq[0]
174 # no packets, oh well
177 age = time.monotonic() - queuetime
178 if age > self.max_queue_time:
186 # request, and also some non-expired packets
188 try: (dummy, packet) = self._pq[0]
189 except IndexError: break
191 encoded = slip.encode(packet)
193 if request.sentLength > 0:
194 if (request.sentLength + len(slip.delimiter)
195 + len(encoded) > self.max_batch_down):
197 request.write(slip.delimiter)
199 request.write(encoded)
202 assert(request.sentLength)
205 # round again, looking for more to do
207 class IphttpResource(twisted.web.resource.Resource):
209 def render_POST(self, request):
210 # find client, update config, etc.
211 ci = ipaddr(request.args['i'])
213 pw = request.args['pw']
214 if pw != c.pw: raise ValueError('bad password')
217 for r, w in (('mbd', 'max_batch_down'),
218 ('mqt', 'max_queue_time'),
219 ('mrt', 'max_request_time')):
220 try: v = request.args[r]
221 except KeyError: continue
225 try: d = request.args['d']
226 except KeyError: d = ''
228 c.process_arriving_data(d)
229 c.new_request(request)
231 def render_GET(self, request):
232 return b'<html><body>hippotit</body></html>'
235 resource = IphttpResource()
236 site = twisted.web.server.Site(resource)
237 for addrspec in cfg.get('server','addrs').split():
239 addr = ipaddress.IPv4Address(addrspec)
240 endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint
241 except AddressValueError:
242 addr = ipaddress.IPv6Address(addrspec)
243 endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint
244 ep = endpointfactory(reactor, cfg.getint('server','port'), addr)
245 crash_on_defer(ep.listen(site))
247 #---------- config and setup ----------
255 network = ipnetwork(cfg.get('virtual','network'))
256 if network.num_addresses < 3 + 2:
257 raise ValueError('network needs at least 2^3 addresses')
260 host = cfg.get('virtual','host')
261 except NoOptionError:
262 host = next(network.hosts())
265 relay = cfg.get('virtual','relay')
266 except NoOptionError:
267 for search in network.hosts():
268 if search == host: continue
272 for cs in cfg.sections():
273 if not (':' in cs or '.' in cs): continue
275 if ci not in network:
276 raise ValueError('client %s not in network' % ci)
278 raise ValueError('multiple client cfg sections for %s' % ci)
279 clients[ci] = Client(ci, cs)
282 mtu = cfg.get('virtual','mtu')
285 for k in ('host','relay','mtu','network'):
286 iic_vars[k] = globals()[k]
288 ipif_command = cfg.get('server','ipif', vars=iic_vars)
294 op.add_option('-c', '--config', dest='configfile',
295 default='/etc/hippottd/server.conf')
297 (opts, args) = op.parse_args()
298 if len(args): op.error('no non-option arguments please')
300 twisted.logger.globalLogPublisher.addObserver(crash_on_critical)
303 cfg.read_string(defcfg)
304 cfg.read(opts.configfile)
312 print('CRASHED (end)', file=sys.stderr)