mdw@git.distorted.org.uk Git - hippotat/blob - hippotatd

   1 #!/usr/bin/python3
   2
   3 from hippotatlib import *
   4
   5 import os
   6 import tempfile
   7 import atexit
   8 import shutil
   9
  10 import twisted.internet
  11 from twisted.web.server import NOT_DONE_YET
  12
  13 import twisted.web.static
  14
  15 import hippotatlib.ownsource
  16 from hippotatlib.ownsource import SourceShipmentPreparer
  17
  18 #import twisted.web.server import Site
  19 #from twisted.web.resource import Resource
  20
  21 import syslog
  22
  23 cleanups = [ ]
  24
  25 clients = { }
  26
  27 #---------- "router" ----------
  28
  29 def route(packet, iface, saddr, daddr):
  30   def lt(dest):
  31     log_debug(DBG.ROUTE, 'route: %s -> %s: %s' % (saddr,daddr,dest), d=packet)
  32   try: dclient = clients[daddr]
  33   except KeyError: dclient = None
  34   if dclient is not None:
  35     lt('client')
  36     dclient.queue_outbound(packet)
  37   elif daddr == c.vaddr or daddr not in c.vnetwork:
  38     lt('inbound')
  39     queue_inbound(ipif, packet)
  40   elif daddr == c.relay:
  41     lt('discard relay')
  42     log_discard(packet, iface, saddr, daddr, 'relay')
  43   else:
  44     lt('discard no-client')
  45     log_discard(packet, iface, saddr, daddr, 'no-client')
  46
  47 #---------- client ----------
  48
  49 class Client():
  50   def __init__(self, ip, cc):
  51     # instance data members
  52     self._ip = ip
  53     self.cc = cc
  54     self._rq = collections.deque() # requests
  55     self._pq = PacketQueue(str(ip), self.cc.max_queue_time)
  56
  57     if ip not in c.vnetwork:
  58       raise ValueError('client %s not in vnetwork' % ip)
  59
  60     if ip in clients:
  61       raise ValueError('multiple client cfg sections for %s' % ip)
  62     clients[ip] = self
  63
  64     self._log(DBG.INIT, 'new')
  65
  66   def _log(self, dflag, msg, **kwargs):
  67     log_debug(dflag, ('client %s: ' % self._ip)+msg, **kwargs)
  68
  69   def process_arriving_data(self, d):
  70     self._log(DBG.FLOW, "req data (enc'd)", d=d)
  71     if not len(d): return
  72     for packet in slip.decode(d):
  73       (saddr, daddr) = packet_addrs(packet)
  74       if saddr != self._ip:
  75         raise ValueError('wrong source address %s' % saddr)
  76       route(packet, self._ip, saddr, daddr)
  77
  78   def _req_cancel(self, request):
  79     self._log(DBG.HTTP_CTRL, 'cancel', idof=request)
  80     request.finish()
  81
  82   def _req_error(self, err, request):
  83     self._log(DBG.HTTP_CTRL, 'error %s' % err, idof=request)
  84     self._req_cancel(request)
  85
  86   def queue_outbound(self, packet):
  87     self._pq.append(packet)
  88     self._check_outbound()
  89
  90   def _req_fin(self, dummy, request, cl):
  91     self._log(DBG.HTTP_CTRL, '_req_fin ' + repr(dummy), idof=request)
  92     try: cl.cancel()
  93     except twisted.internet.error.AlreadyCalled: pass
  94
  95   def new_request(self, request):
  96     request.setHeader('Content-Type','application/octet-stream')
  97     cl = reactor.callLater(self.cc.http_timeout, self._req_cancel, request)
  98     nf = request.notifyFinish()
  99     nf.addErrback(self._req_error, request)
 100     nf.addCallback(self._req_fin, request, cl)
 101     self._rq.append(request)
 102     self._check_outbound()
 103
 104   def _req_write(self, req, d):
 105     self._log(DBG.HTTP, 'req_write ', idof=req, d=d)
 106     req.write(d)
 107
 108   def _check_outbound(self):
 109     log_debug(DBG.HTTP_CTRL, 'CHKO')
 110     while True:
 111       try: request = self._rq[0]
 112       except IndexError: request = None
 113       if request and request.finished:
 114         self._log(DBG.HTTP_CTRL, 'CHKO req finished, discard', idof=request)
 115         self._rq.popleft()
 116         continue
 117
 118       if not self._pq.nonempty():
 119         # no packets, oh well
 120         self._log(DBG.HTTP_CTRL, 'CHKO no packets, OUT-DONE', idof=request)
 121         break
 122
 123       if request is None:
 124         # no request
 125         self._log(DBG.HTTP_CTRL, 'CHKO no request, OUT-DONE', idof=request)
 126         break
 127
 128       self._log(DBG.HTTP_CTRL, 'CHKO processing', idof=request)
 129       # request, and also some non-expired packets
 130       self._pq.process((lambda: request.sentLength),
 131                        (lambda d: self._req_write(request, d)),
 132                        self.cc.max_batch_down)
 133
 134       assert(request.sentLength)
 135       self._rq.popleft()
 136       request.finish()
 137       self._log(DBG.HTTP, 'complete', idof=request)
 138       # round again, looking for more to do
 139
 140     while len(self._rq) > self.cc.target_requests_outstanding:
 141       request = self._rq.popleft()
 142       self._log(DBG.HTTP, 'CHKO above target, returning empty', idof=request)
 143       request.finish()
 144
 145 def process_request(request, desca):
 146   # find client, update config, etc.
 147   metadata = request.args[b'm'][0]
 148   metadata = metadata.split(b'\r\n')
 149   (ci_s, pw, tro, cto) = metadata[0:4]
 150   desca['m[0,2:3]'] = [ci_s, tro, cto]
 151   ci_s = ci_s.decode('utf-8')
 152   tro = int(tro); desca['tro']= tro
 153   cto = int(cto); desca['cto']= cto
 154   ci = ipaddr(ci_s)
 155   desca['ci'] = ci
 156   cl = clients[ci]
 157   if pw != cl.cc.password: raise ValueError('bad password')
 158   desca['pwok']=True
 159
 160   if tro != cl.cc.target_requests_outstanding:
 161     raise ValueError('tro must be %d' % cl.cc.target_requests_outstanding)
 162
 163   if cto < cl.cc.http_timeout:
 164     raise ValueError('cto must be >= %d' % cl.cc.http_timeout)
 165
 166   try:
 167     d = request.args[b'd'][0]
 168     desca['d'] = d
 169     desca['dlen'] = len(d)
 170   except KeyError:
 171     d = b''
 172     desca['dlen'] = None
 173
 174   log_http(desca, 'processing', idof=id(request), d=d)
 175
 176   d = mime_translate(d)
 177
 178   cl.process_arriving_data(d)
 179   cl.new_request(request)
 180
 181 def log_http(desca, msg, **kwargs):
 182   try:
 183     kwargs['d'] = desca['d']
 184     del desca['d']
 185   except KeyError:
 186     pass
 187   log_debug(DBG.HTTP, msg + repr(desca), **kwargs)
 188
 189 class NotStupidResource(twisted.web.resource.Resource):
 190   # why this is not the default is a mystery!
 191   def getChild(self, name, request):
 192     if name == b'': return self
 193     else: return twisted.web.resource.Resource.getChild(name, request)
 194
 195 class IphttpResource(NotStupidResource):
 196   def render_POST(self, request):
 197     log_debug(DBG.HTTP_FULL,
 198               'req recv: ' + repr(request) + ' ' + repr(request.args),
 199               idof=id(request))
 200     desca = {'d': None}
 201     try: process_request(request, desca)
 202     except Exception as e:
 203       emsg = traceback.format_exc()
 204       log_http(desca, 'RETURNING EXCEPTION ' + emsg)
 205       request.setHeader('Content-Type','text/plain; charset="utf-8"')
 206       request.setResponseCode(400)
 207       return (emsg + ' # ' + repr(desca) + '\r\n').encode('utf-8')
 208     log_debug(DBG.HTTP_CTRL, '...', idof=id(request))
 209     return NOT_DONE_YET
 210
 211   def render_GET(self, request):
 212     log_debug(DBG.HTTP, 'GET request')
 213     return b'''
 214 <html><body>
 215 hippotat
 216 <p>
 217 <a href="source">source</a> available
 218 </body></html>
 219 '''
 220
 221 class SourceResource(twisted.web.static.File):
 222   def __init__(self):
 223     td = tempfile.mkdtemp()
 224
 225     def cleanup():
 226       try: shutil.rmtree(td)
 227       except FileNotFoundError: pass
 228
 229     cleanups.append(cleanup)
 230
 231     self._ssp = SourceShipmentPreparer(td)
 232     self._ssp.logger = self.log
 233     self._ssp.generate()
 234
 235     super().__init__(self._ssp.output_path)
 236
 237   def log(self, m):
 238     log_debug(DBG.OWNSOURCE, m)
 239
 240 def start_http():
 241   resource = IphttpResource()
 242   resource.putChild(b'source',SourceResource())
 243   site = twisted.web.server.Site(resource)
 244   for sa in c.saddrs:
 245     ep = sa.make_endpoint()
 246     crash_on_defer(ep.listen(site))
 247     log_debug(DBG.INIT, 'listening on %s' % sa)
 248
 249 #---------- config and setup ----------
 250
 251 def process_cfg(putative_servers, putative_clients):
 252   global c
 253   c = ConfigResults()
 254   c.server = cfg.get('SERVER','server')
 255
 256   cfg_process_common(c, c.server)
 257   cfg_process_saddrs(c, c.server)
 258   cfg_process_vnetwork(c, c.server)
 259   cfg_process_vaddr(c, c.server)
 260
 261   for (ci,cs) in putative_clients.items():
 262     cc = ConfigResults()
 263     sections = cfg_process_client_common(cc,c.server,cs,ci)
 264     if not sections: continue
 265     cfg_process_client_limited(cc,c.server,sections, 'max_batch_down')
 266     cfg_process_client_limited(cc,c.server,sections, 'max_queue_time')
 267     Client(ci, cc)
 268
 269   try:
 270     c.vrelay = cfg.get(c.server, 'vrelay')
 271   except NoOptionError:
 272     for search in c.vnetwork.hosts():
 273       if search == c.vaddr: continue
 274       c.vrelay = search
 275       break
 276
 277   cfg_process_ipif(c,
 278                    [c.server, 'DEFAULT'],
 279                    (('local','vaddr'),
 280                     ('peer', 'vrelay'),
 281                     ('rnets','vnetwork')))
 282
 283 def catch_termination():
 284   def run_cleanups():
 285     for cleanup in cleanups:
 286       cleanup()
 287
 288   atexit.register(run_cleanups)
 289
 290   def signal_handler(name, sig, *args):
 291     signal.signal(sig, signal.SIG_DFL)
 292     print('exiting due to %s' % name, file=sys.stderr)
 293     run_cleanups()
 294     os.kill(os.getpid(), sig)
 295     raise RuntimeError('did not die due to signal %s !' % name)
 296
 297   for sig in (signal.SIGINT, signal.SIGTERM):
 298     signal.signal(sig, partial(signal_handler, sig.name))
 299
 300 common_startup(process_cfg)
 301 catch_termination()
 302 ipif = start_ipif(c.ipif_command, (lambda p,s,d: route(p,"[ipif]",s,d)))
 303 start_http()
 304 common_run()