8 import twisted.internet
9 import twisted.internet.endpoints
10 from twisted.web.server import NOT_DONE_YET
11 from twisted.logger import LogLevel
13 #import twisted.web.server import Site
14 #from twisted.web.resource import Resource
16 from optparse import OptionParser
17 from configparser import ConfigParser
18 from configparser import NoOptionError
28 max_batch_down = 65536
31 target_requests_outstanding = 3
40 ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s
45 max_batch_down = 262144
47 max_request_time = 121
48 target_requests_outstanding = 10
51 #---------- error handling ----------
54 print('CRASH ', err, file=sys.stderr)
56 except twisted.internet.error.ReactorNotRunning: pass
58 def crash_on_defer(defer):
59 defer.addErrback(lambda err: crash(err))
61 def crash_on_critical(event):
62 if event.get('log_level') >= LogLevel.critical:
63 crash(twisted.logger.formatEvent(event))
65 #---------- "router" ----------
67 def route(packet, saddr, daddr):
68 print('TRACE ', saddr, daddr, packet)
69 try: client = clients[daddr]
70 except KeyError: dclient = None
71 if dclient is not None:
72 dclient.queue_outbound(packet)
73 elif saddr.is_link_local or daddr.is_link_local:
74 log_discard(packet, saddr, daddr, 'link-local')
75 elif daddr == host or daddr not in network:
76 print('TRACE INBOUND ', saddr, daddr, packet)
79 log_discard(packet, saddr, daddr, 'relay')
81 log_discard(packet, saddr, daddr, 'no client')
83 def log_discard(packet, saddr, daddr, why):
84 print('DROP ', saddr, daddr, why)
85 # syslog.syslog(syslog.LOG_DEBUG,
86 # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why))
88 #---------- client ----------
91 def __init__(self, ip, cs):
92 # instance data members
95 self.pw = cfg.get(cs, 'password')
96 self._rq = collections.deque() # requests
97 # self._pq = PacketQueue(...)
102 # .target_requests_outstanding
103 for k in ('max_batch_down','max_queue_time','max_request_time',
104 'target_requests_outstanding'):
105 req = cfg.getint(cs, k)
106 limit = cfg.getint('limits',k)
107 self.__dict__[k] = min(req, limit)
108 self._pq = PacketQueue(self.max_queue_time)
110 def process_arriving_data(self, d):
111 for packet in slip.decode(d):
112 (saddr, daddr) = packet_addrs(packet)
113 if saddr != self._ip:
114 raise ValueError('wrong source address %s' % saddr)
115 route(packet, saddr, daddr)
117 def _req_cancel(self, request):
120 def _req_error(self, err, request):
121 self._req_cancel(request)
123 def queue_outbound(self, packet):
124 self._pq.append(packet)
126 def http_request(self, request):
127 request.setHeader('Content-Type','application/octet-stream')
128 reactor.callLater(self.max_request_time, self._req_cancel, request)
129 request.notifyFinish().addErrback(self._req_error, request)
130 self._rq.append(request)
131 self._check_outbound()
133 def _check_outbound(self):
135 try: request = self._rq[0]
136 except IndexError: request = None
137 if request and request.finished:
141 if not self._pq.nonempty():
142 # no packets, oh well
149 # request, and also some non-expired packets
151 packet = self.pq.popleft()
152 if packet is None: break
154 encoded = slip.encode(packet)
156 if request.sentLength > 0:
157 if (request.sentLength + len(slip.delimiter)
158 + len(encoded) > self.max_batch_down):
160 request.write(slip.delimiter)
162 request.write(encoded)
165 assert(request.sentLength)
168 # round again, looking for more to do
170 while len(self._rq) > self.target_requests_outstanding:
171 request = self._rq.popleft()
174 class IphttpResource(twisted.web.resource.Resource):
176 def render_POST(self, request):
177 # find client, update config, etc.
178 ci = ipaddr(request.args['i'])
180 pw = request.args['pw']
181 if pw != c.pw: raise ValueError('bad password')
184 for r, w in (('mbd', 'max_batch_down'),
185 ('mqt', 'max_queue_time'),
186 ('mrt', 'max_request_time'),
187 ('tro', 'target_requests_outstanding')):
188 try: v = request.args[r]
189 except KeyError: continue
193 try: d = request.args['d']
194 except KeyError: d = ''
196 c.process_arriving_data(d)
197 c.new_request(request)
199 def render_GET(self, request):
200 return b'<html><body>hippotat</body></html>'
203 resource = IphttpResource()
204 site = twisted.web.server.Site(resource)
205 for addrspec in cfg.get('server','addrs').split():
207 addr = ipaddress.IPv4Address(addrspec)
208 endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint
209 except AddressValueError:
210 addr = ipaddress.IPv6Address(addrspec)
211 endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint
212 ep = endpointfactory(reactor, cfg.getint('server','port'), addr)
213 crash_on_defer(ep.listen(site))
215 #---------- config and setup ----------
223 network = ipnetwork(cfg.get('virtual','network'))
224 if network.num_addresses < 3 + 2:
225 raise ValueError('network needs at least 2^3 addresses')
228 host = cfg.get('virtual','host')
229 except NoOptionError:
230 host = next(network.hosts())
233 relay = cfg.get('virtual','relay')
234 except NoOptionError:
235 for search in network.hosts():
236 if search == host: continue
240 for cs in cfg.sections():
241 if not (':' in cs or '.' in cs): continue
243 if ci not in network:
244 raise ValueError('client %s not in network' % ci)
246 raise ValueError('multiple client cfg sections for %s' % ci)
247 clients[ci] = Client(ci, cs)
250 mtu = cfg.get('virtual','mtu')
253 for k in ('host','relay','mtu','network'):
254 iic_vars[k] = globals()[k]
256 ipif_command = cfg.get('server','ipif', vars=iic_vars)
262 op.add_option('-c', '--config', dest='configfile',
263 default='/etc/hippottd/server.conf')
265 (opts, args) = op.parse_args()
266 if len(args): op.error('no non-option arguments please')
268 twisted.logger.globalLogPublisher.addObserver(crash_on_critical)
271 cfg.read_string(defcfg)
272 cfg.read(opts.configfile)
275 start_ipif(ipif_command, route)
280 print('CRASHED (end)', file=sys.stderr)