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