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

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