3 # Hippotat - Asinine IP Over HTTP program
4 # ./hippotatd - server main program
6 # Copyright 2017 Ian Jackson
8 # This program is free software: you can redistribute it and/or modify
9 # it under the terms of the GNU Affero General Public License as
10 # published by the Free Software Foundation, either version 3 of the
11 # License, or (at your option) any later version, with the "CAF Login
12 # Exception" as published by Ian Jackson (version 2, or at your option
13 # any later version) as an Additional Permission.
15 # This program is distributed in the hope that it will be useful,
16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 # GNU Affero General Public License for more details.
20 # You should have received a copy of the GNU Affero General Public
21 # License and the CAF Login Exception along with this program, in the
22 # file AGPLv3+CAFv2. If not, email Ian Jackson
23 # <ijackson@chiark.greenend.org.uk>.
26 from hippotatlib import *
33 import twisted.internet
34 from twisted.web.server import NOT_DONE_YET
36 import twisted.web.static
38 import hippotatlib.ownsource
39 from hippotatlib.ownsource import SourceShipmentPreparer
41 #import twisted.web.server import Site
42 #from twisted.web.resource import Resource
50 #---------- "router" ----------
52 def route(packet, iface, saddr, daddr):
54 log_debug(DBG.ROUTE, 'route: %s -> %s: %s' % (saddr,daddr,dest), d=packet)
55 try: dclient = clients[daddr]
56 except KeyError: dclient = None
57 if dclient is not None:
59 dclient.queue_outbound(packet)
60 elif daddr == c.vaddr or daddr not in c.vnetwork:
62 queue_inbound(ipif, packet)
63 elif daddr == c.relay:
65 log_discard(packet, iface, saddr, daddr, 'relay')
67 lt('discard no-client')
68 log_discard(packet, iface, saddr, daddr, 'no-client')
70 #---------- client ----------
73 def __init__(self, ip, cc):
74 # instance data members
77 self._rq = collections.deque() # requests
78 self._pq = PacketQueue(str(ip), self.cc.max_queue_time)
80 if ip not in c.vnetwork:
81 raise ValueError('client %s not in vnetwork' % ip)
84 raise ValueError('multiple client cfg sections for %s' % ip)
87 self._log(DBG.INIT, 'new')
89 def _log(self, dflag, msg, **kwargs):
90 log_debug(dflag, ('client %s: ' % self._ip)+msg, **kwargs)
92 def process_arriving_data(self, d):
93 self._log(DBG.FLOW, "req data (enc'd)", d=d)
95 for packet in slip.decode(d):
96 (saddr, daddr) = packet_addrs(packet)
98 raise ValueError('wrong source address %s' % saddr)
99 route(packet, self._ip, saddr, daddr)
101 def _req_cancel(self, request):
102 self._log(DBG.HTTP_CTRL, 'cancel', idof=request)
105 def _req_error(self, err, request):
106 self._log(DBG.HTTP_CTRL, 'error %s' % err, idof=request)
107 self._req_cancel(request)
109 def queue_outbound(self, packet):
110 self._pq.append(packet)
111 self._check_outbound()
113 def _req_fin(self, dummy, request, cl):
114 self._log(DBG.HTTP_CTRL, '_req_fin ' + repr(dummy), idof=request)
116 except twisted.internet.error.AlreadyCalled: pass
118 def new_request(self, request):
119 request.setHeader('Content-Type','application/octet-stream')
120 cl = reactor.callLater(self.cc.http_timeout, self._req_cancel, request)
121 nf = request.notifyFinish()
122 nf.addErrback(self._req_error, request)
123 nf.addCallback(self._req_fin, request, cl)
124 self._rq.append(request)
125 self._check_outbound()
127 def _req_write(self, req, d):
128 self._log(DBG.HTTP, 'req_write ', idof=req, d=d)
131 def _check_outbound(self):
132 log_debug(DBG.HTTP_CTRL, 'CHKO')
134 try: request = self._rq[0]
135 except IndexError: request = None
136 if request and request.finished:
137 self._log(DBG.HTTP_CTRL, 'CHKO req finished, discard', idof=request)
141 if not self._pq.nonempty():
142 # no packets, oh well
143 self._log(DBG.HTTP_CTRL, 'CHKO no packets, OUT-DONE', idof=request)
148 self._log(DBG.HTTP_CTRL, 'CHKO no request, OUT-DONE', idof=request)
151 self._log(DBG.HTTP_CTRL, 'CHKO processing', idof=request)
152 # request, and also some non-expired packets
153 self._pq.process((lambda: request.sentLength),
154 (lambda d: self._req_write(request, d)),
155 self.cc.max_batch_down)
157 assert(request.sentLength)
160 self._log(DBG.HTTP, 'complete', idof=request)
161 # round again, looking for more to do
163 while len(self._rq) > self.cc.target_requests_outstanding:
164 request = self._rq.popleft()
165 self._log(DBG.HTTP, 'CHKO above target, returning empty', idof=request)
168 def process_request(request, desca):
169 # find client, update config, etc.
170 metadata = request.args[b'm'][0]
171 metadata = metadata.split(b'\r\n')
172 (ci_s, pw, tro, cto) = metadata[0:4]
173 desca['m[0,2:3]'] = [ci_s, tro, cto]
174 ci_s = ci_s.decode('utf-8')
175 tro = int(tro); desca['tro']= tro
176 cto = int(cto); desca['cto']= cto
180 if pw != cl.cc.password: raise ValueError('bad password')
183 if tro != cl.cc.target_requests_outstanding:
184 raise ValueError('tro must be %d' % cl.cc.target_requests_outstanding)
186 if cto < cl.cc.http_timeout:
187 raise ValueError('cto must be >= %d' % cl.cc.http_timeout)
190 d = request.args[b'd'][0]
192 desca['dlen'] = len(d)
197 log_http(desca, 'processing', idof=id(request), d=d)
199 d = mime_translate(d)
201 cl.process_arriving_data(d)
202 cl.new_request(request)
204 def log_http(desca, msg, **kwargs):
206 kwargs['d'] = desca['d']
210 log_debug(DBG.HTTP, msg + repr(desca), **kwargs)
212 class NotStupidResource(twisted.web.resource.Resource):
213 # why this is not the default is a mystery!
214 def getChild(self, name, request):
215 if name == b'': return self
216 else: return twisted.web.resource.Resource.getChild(name, request)
218 class IphttpResource(NotStupidResource):
219 def render_POST(self, request):
220 log_debug(DBG.HTTP_FULL,
221 'req recv: ' + repr(request) + ' ' + repr(request.args),
224 try: process_request(request, desca)
225 except Exception as e:
226 emsg = traceback.format_exc()
227 log_http(desca, 'RETURNING EXCEPTION ' + emsg)
228 request.setHeader('Content-Type','text/plain; charset="utf-8"')
229 request.setResponseCode(400)
230 return (emsg + ' # ' + repr(desca) + '\r\n').encode('utf-8')
231 log_debug(DBG.HTTP_CTRL, '...', idof=id(request))
234 def render_GET(self, request):
235 log_debug(DBG.HTTP, 'GET request')
240 <a href="source">source</a> available
244 class SourceResource(twisted.web.static.File):
246 td = tempfile.mkdtemp()
249 try: shutil.rmtree(td)
250 except FileNotFoundError: pass
252 cleanups.append(cleanup)
254 self._ssp = SourceShipmentPreparer(td)
255 self._ssp.logger = self.log
258 super().__init__(self._ssp.output_path)
261 log_debug(DBG.OWNSOURCE, m)
264 resource = IphttpResource()
265 resource.putChild(b'source',SourceResource())
266 site = twisted.web.server.Site(resource)
268 ep = sa.make_endpoint()
269 crash_on_defer(ep.listen(site))
270 log_debug(DBG.INIT, 'listening on %s' % sa)
271 reactor.callLater(0.1, (lambda: log.info('hippotatd started', dflag=False)))
273 #---------- config and setup ----------
275 def process_cfg(putative_servers, putative_clients):
278 c.server = cfg.get('SERVER','server')
280 cfg_process_common(c, c.server)
281 cfg_process_saddrs(c, c.server)
282 cfg_process_vnetwork(c, c.server)
283 cfg_process_vaddr(c, c.server)
285 for (ci,cs) in putative_clients.items():
287 sections = cfg_process_client_common(cc,c.server,cs,ci)
288 if not sections: continue
289 cfg_process_client_limited(cc,c.server,sections, 'max_batch_down')
290 cfg_process_client_limited(cc,c.server,sections, 'max_queue_time')
294 c.vrelay = cfg.get(c.server, 'vrelay')
295 except NoOptionError:
296 for search in c.vnetwork.hosts():
297 if search == c.vaddr: continue
302 [c.server, 'DEFAULT'],
305 ('rnets','vnetwork')))
307 def catch_termination():
309 for cleanup in cleanups:
312 atexit.register(run_cleanups)
314 def signal_handler(name, sig, *args):
315 signal.signal(sig, signal.SIG_DFL)
316 print('exiting due to %s' % name, file=sys.stderr)
318 os.kill(os.getpid(), sig)
319 raise RuntimeError('did not die due to signal %s !' % name)
321 for sig in (signal.SIGINT, signal.SIGTERM):
322 signal.signal(sig, partial(signal_handler, sig.name))
324 common_startup(process_cfg)
326 ipif = start_ipif(c.ipif_command, (lambda p,s,d: route(p,"[ipif]",s,d)))