4 signal.signal(signal.SIGINT, signal.SIG_DFL)
9 import twisted.internet
10 import twisted.internet.endpoints
11 from twisted.web.server import NOT_DONE_YET
12 from twisted.logger import LogLevel
14 #import twisted.web.server import Site
15 #from twisted.web.resource import Resource
17 from optparse import OptionParser
18 from configparser import ConfigParser
19 from configparser import NoOptionError
25 from hippotat import *
31 max_batch_down = 65536
34 target_requests_outstanding = 3
43 ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s
48 max_batch_down = 262144
50 max_request_time = 121
51 target_requests_outstanding = 10
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 = PacketQueue(...)
105 # .target_requests_outstanding
106 for k in ('max_batch_down','max_queue_time','max_request_time',
107 'target_requests_outstanding'):
108 req = cfg.getint(cs, k)
109 limit = cfg.getint('limits',k)
110 self.__dict__[k] = min(req, limit)
111 self._pq = PacketQueue(self.max_queue_time)
113 def process_arriving_data(self, d):
114 for packet in slip.decode(d):
115 (saddr, daddr) = packet_addrs(packet)
116 if saddr != self._ip:
117 raise ValueError('wrong source address %s' % saddr)
118 route(packet, saddr, daddr)
120 def _req_cancel(self, request):
123 def _req_error(self, err, request):
124 self._req_cancel(request)
126 def queue_outbound(self, packet):
127 self._pq.append(packet)
129 def http_request(self, request):
130 request.setHeader('Content-Type','application/octet-stream')
131 reactor.callLater(self.max_request_time, self._req_cancel, request)
132 request.notifyFinish().addErrback(self._req_error, request)
133 self._rq.append(request)
134 self._check_outbound()
136 def _check_outbound(self):
138 try: request = self._rq[0]
139 except IndexError: request = None
140 if request and request.finished:
144 if not self._pq.nonempty():
145 # no packets, oh well
152 # request, and also some non-expired packets
154 packet = self.pq.popleft()
155 if packet is None: break
157 encoded = slip.encode(packet)
159 if request.sentLength > 0:
160 if (request.sentLength + len(slip.delimiter)
161 + len(encoded) > self.max_batch_down):
163 request.write(slip.delimiter)
165 request.write(encoded)
168 assert(request.sentLength)
171 # round again, looking for more to do
173 while len(self._rq) > self.target_requests_outstanding:
174 request = self._rq.popleft()
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 ('tro', 'target_requests_outstanding')):
191 try: v = request.args[r]
192 except KeyError: continue
196 try: d = request.args['d']
197 except KeyError: d = ''
199 c.process_arriving_data(d)
200 c.new_request(request)
202 def render_GET(self, request):
203 return b'<html><body>hippotat</body></html>'
206 resource = IphttpResource()
207 site = twisted.web.server.Site(resource)
208 for addrspec in cfg.get('server','addrs').split():
210 addr = ipaddress.IPv4Address(addrspec)
211 endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint
212 except AddressValueError:
213 addr = ipaddress.IPv6Address(addrspec)
214 endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint
215 ep = endpointfactory(reactor, cfg.getint('server','port'), addr)
216 crash_on_defer(ep.listen(site))
218 #---------- config and setup ----------
226 network = ipnetwork(cfg.get('virtual','network'))
227 if network.num_addresses < 3 + 2:
228 raise ValueError('network needs at least 2^3 addresses')
231 host = cfg.get('virtual','host')
232 except NoOptionError:
233 host = next(network.hosts())
236 relay = cfg.get('virtual','relay')
237 except NoOptionError:
238 for search in network.hosts():
239 if search == host: continue
243 for cs in cfg.sections():
244 if not (':' in cs or '.' in cs): continue
246 if ci not in network:
247 raise ValueError('client %s not in network' % ci)
249 raise ValueError('multiple client cfg sections for %s' % ci)
250 clients[ci] = Client(ci, cs)
253 mtu = cfg.get('virtual','mtu')
256 for k in ('host','relay','mtu','network'):
257 iic_vars[k] = globals()[k]
259 ipif_command = cfg.get('server','ipif', vars=iic_vars)
265 op.add_option('-c', '--config', dest='configfile',
266 default='/etc/hippottd/server.conf')
268 (opts, args) = op.parse_args()
269 if len(args): op.error('no non-option arguments please')
271 twisted.logger.globalLogPublisher.addObserver(crash_on_critical)
274 cfg.read_string(defcfg)
275 cfg.read(opts.configfile)
278 start_ipif(ipif_command, route)
283 print('CRASHED (end)', file=sys.stderr)