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 hippotat 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 #---------- client ----------
94 def __init__(self, ip, cs):
95 # instance data members
98 self.pw = cfg.get(cs, 'password')
99 self._rq = collections.deque() # requests
100 self._pq = collections.deque() # packets
105 for k in ('max_batch_down','max_queue_time','max_request_time'):
106 req = cfg.getint(cs, k)
107 limit = cfg.getint('limits',k)
108 self.__dict__[k] = min(req, limit)
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((time.monotonic(), 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 # now request is an unfinished request, or None
142 try: (queuetime, packet) = self._pq[0]
144 # no packets, oh well
147 age = time.monotonic() - queuetime
148 if age > self.max_queue_time:
156 # request, and also some non-expired packets
158 try: (dummy, packet) = self._pq[0]
159 except IndexError: break
161 encoded = slip.encode(packet)
163 if request.sentLength > 0:
164 if (request.sentLength + len(slip.delimiter)
165 + len(encoded) > self.max_batch_down):
167 request.write(slip.delimiter)
169 request.write(encoded)
172 assert(request.sentLength)
175 # round again, looking for more to do
177 class IphttpResource(twisted.web.resource.Resource):
179 def render_POST(self, request):
180 # find client, update config, etc.
181 ci = ipaddr(request.args['i'])
183 pw = request.args['pw']
184 if pw != c.pw: raise ValueError('bad password')
187 for r, w in (('mbd', 'max_batch_down'),
188 ('mqt', 'max_queue_time'),
189 ('mrt', 'max_request_time')):
190 try: v = request.args[r]
191 except KeyError: continue
195 try: d = request.args['d']
196 except KeyError: d = ''
198 c.process_arriving_data(d)
199 c.new_request(request)
201 def render_GET(self, request):
202 return b'<html><body>hippotat</body></html>'
205 resource = IphttpResource()
206 site = twisted.web.server.Site(resource)
207 for addrspec in cfg.get('server','addrs').split():
209 addr = ipaddress.IPv4Address(addrspec)
210 endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint
211 except AddressValueError:
212 addr = ipaddress.IPv6Address(addrspec)
213 endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint
214 ep = endpointfactory(reactor, cfg.getint('server','port'), addr)
215 crash_on_defer(ep.listen(site))
217 #---------- config and setup ----------
225 network = ipnetwork(cfg.get('virtual','network'))
226 if network.num_addresses < 3 + 2:
227 raise ValueError('network needs at least 2^3 addresses')
230 host = cfg.get('virtual','host')
231 except NoOptionError:
232 host = next(network.hosts())
235 relay = cfg.get('virtual','relay')
236 except NoOptionError:
237 for search in network.hosts():
238 if search == host: continue
242 for cs in cfg.sections():
243 if not (':' in cs or '.' in cs): continue
245 if ci not in network:
246 raise ValueError('client %s not in network' % ci)
248 raise ValueError('multiple client cfg sections for %s' % ci)
249 clients[ci] = Client(ci, cs)
252 mtu = cfg.get('virtual','mtu')
255 for k in ('host','relay','mtu','network'):
256 iic_vars[k] = globals()[k]
258 ipif_command = cfg.get('server','ipif', vars=iic_vars)
264 op.add_option('-c', '--config', dest='configfile',
265 default='/etc/hippottd/server.conf')
267 (opts, args) = op.parse_args()
268 if len(args): op.error('no non-option arguments please')
270 twisted.logger.globalLogPublisher.addObserver(crash_on_critical)
273 cfg.read_string(defcfg)
274 cfg.read(opts.configfile)
277 start_ipif(ipif_command, route)
282 print('CRASHED (end)', file=sys.stderr)