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

   1 #!/usr/bin/python3
   2
   3 from hippotat 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.server or daddr not in c.network:
  28     lt('inbound')
  29     queue_inbound(packet)
  30   elif daddr == 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, cs, pw):
  41     # instance data members
  42     self._ip = ip
  43     self._cs = cs
  44     self.pw = pw
  45     self._rq = collections.deque() # requests
  46     # self._pq = PacketQueue(...)
  47     # plus from config:
  48     #  .max_batch_down
  49     #  .max_queue_time
  50     #  .max_request_time
  51     #  .target_requests_outstanding
  52
  53     if ip not in c.network:
  54       raise ValueError('client %s not in network' % ip)
  55
  56     for k in ('max_batch_down','max_queue_time','max_request_time',
  57               'target_requests_outstanding'):
  58       req = cfg.getint(cs, k)
  59       limit = cfg.getint('limits',k)
  60       self.__dict__[k] = min(req, limit)
  61
  62     self._pq = PacketQueue(str(ip), self.max_queue_time)
  63
  64     if ip in clients:
  65       raise ValueError('multiple client cfg sections for %s' % ip)
  66     clients[ip] = self
  67
  68     self._log(DBG.INIT, 'new')
  69
  70   def _log(self, dflag, msg, **kwargs):
  71     log_debug(dflag, ('client %s: ' % self._ip)+msg, **kwargs)
  72
  73   def process_arriving_data(self, d):
  74     self._log(DBG.FLOW, "req data (enc'd)", d=d)
  75     if not len(d): return
  76     for packet in slip.decode(d):
  77       (saddr, daddr) = packet_addrs(packet)
  78       if saddr != self._ip:
  79         raise ValueError('wrong source address %s' % saddr)
  80       route(packet, self._ip, saddr, daddr)
  81
  82   def _req_cancel(self, request):
  83     self._log(DBG.HTTP_CTRL, 'cancel', idof=request)
  84     request.finish()
  85
  86   def _req_error(self, err, request):
  87     self._log(DBG.HTTP_CTRL, 'error %s' % err, idof=request)
  88     self._req_cancel(request)
  89
  90   def queue_outbound(self, packet):
  91     self._pq.append(packet)
  92     self._check_outbound()
  93
  94   def new_request(self, request):
  95     request.setHeader('Content-Type','application/octet-stream')
  96     reactor.callLater(self.max_request_time, self._req_cancel, request)
  97     request.notifyFinish().addErrback(self._req_error, request)
  98     self._rq.append(request)
  99     self._check_outbound()
 100
 101   def _req_write(self, req, d):
 102     self._log(DBG.HTTP, 'req_write ', idof=req, d=d)
 103     req.write(d)
 104
 105   def _check_outbound(self):
 106     log_debug(DBG.HTTP_CTRL, 'CHKO')
 107     while True:
 108       try: request = self._rq[0]
 109       except IndexError: request = None
 110       if request and request.finished:
 111         self._log(DBG.HTTP_CTRL, 'CHKO req finished, discard', idof=request)
 112         self._rq.popleft()
 113         continue
 114
 115       if not self._pq.nonempty():
 116         # no packets, oh well
 117         self._log(DBG.HTTP_CTRL, 'CHKO no packets, OUT-DONE', idof=request)
 118         break
 119
 120       if request is None:
 121         # no request
 122         self._log(DBG.HTTP_CTRL, 'CHKO no request, OUT-DONE', idof=request)
 123         break
 124
 125       self._log(DBG.HTTP_CTRL, 'CHKO processing', idof=request)
 126       # request, and also some non-expired packets
 127       self._pq.process((lambda: request.sentLength),
 128                        (lambda d: self._req_write(request, d)),
 129                        self.max_batch_down)
 130
 131       assert(request.sentLength)
 132       self._rq.popleft()
 133       request.finish()
 134       self._log(DBG.HTTP, 'complete', idof=request)
 135       # round again, looking for more to do
 136
 137     while len(self._rq) > self.target_requests_outstanding:
 138       request = self._rq.popleft()
 139       self._log(DBG.HTTP, 'CHKO above target, returning empty', idof=request)
 140       request.finish()
 141
 142 def process_request(request, desca):
 143   # find client, update config, etc.
 144   metadata = request.args[b'm'][0]
 145   metadata = metadata.split(b'\r\n')
 146   (ci_s, pw, tro) = metadata[0:3]
 147   desca['m[0,2]'] = [ci_s, tro]
 148   ci_s = ci_s.decode('utf-8')
 149   tro = int(tro)
 150   desca['tro']= tro
 151   ci = ipaddr(ci_s)
 152   desca['ci'] = ci
 153   cl = clients[ci]
 154   if pw != cl.pw: raise ValueError('bad password')
 155   desca['pwok']=True
 156
 157   if tro != cl.target_requests_outstanding:
 158     raise ValueError('tro must be %d' % cl.target_requests_outstanding)
 159
 160   try:
 161     d = request.args[b'd'][0]
 162     desca['d'] = d
 163     desca['dlen'] = len(d)
 164   except KeyError:
 165     d = b''
 166     desca['dlen'] = None
 167
 168   log_http(desca, 'processing', idof=id(request), d=d)
 169
 170   d = mime_translate(d)
 171
 172   cl.process_arriving_data(d)
 173   cl.new_request(request)
 174
 175 def log_http(desca, msg, **kwargs):
 176   try:
 177     kwargs['d'] = desca['d']
 178     del desca['d']
 179   except KeyError:
 180     pass
 181   log_debug(DBG.HTTP, msg + repr(desca), **kwargs)
 182
 183 class IphttpResource(twisted.web.resource.Resource):
 184   isLeaf = True
 185   def render_POST(self, request):
 186     log_debug(DBG.HTTP_FULL,
 187               'req recv: ' + repr(request) + ' ' + repr(request.args),
 188               idof=id(request))
 189     desca = {'d': None}
 190     try: process_request(request, desca)
 191     except Exception as e:
 192       emsg = traceback.format_exc()
 193       log_http(desca, 'RETURNING EXCEPTION ' + emsg)
 194       request.setHeader('Content-Type','text/plain; charset="utf-8"')
 195       request.setResponseCode(400)
 196       return (emsg + ' # ' + repr(desca) + '\r\n').encode('utf-8')
 197     log_debug(DBG.HTTP_CTRL, '...', idof=id(request))
 198     return NOT_DONE_YET
 199
 200   def render_GET(self, request):
 201     log_debug(DBG.HTTP, 'GET request')
 202     return b'<html><body>hippotat</body></html>'
 203
 204 def start_http():
 205   resource = IphttpResource()
 206   site = twisted.web.server.Site(resource)
 207   for sa in c.saddrs:
 208     ep = sa.make_endpoint()
 209     crash_on_defer(ep.listen(site))
 210     log_debug(DBG.INIT, 'listening on %s' % sa)
 211
 212 #---------- config and setup ----------
 213
 214 def process_cfg():
 215   process_cfg_common_always()
 216   process_cfg_server()
 217   process_cfg_network()
 218
 219   try:
 220     c.relay = cfg.get('virtual','relay')
 221   except NoOptionError:
 222     for search in c.network.hosts():
 223       if search == c.server: continue
 224       c.relay = search
 225       break
 226
 227   process_cfg_saddrs()
 228   process_cfg_clients(Client)
 229
 230   process_cfg_ipif('server',
 231                    (('local','server'),
 232                     ('peer', 'relay'),
 233                     ('rnets','network')))
 234
 235 common_startup()
 236 process_cfg()
 237 start_ipif(c.ipif_command, (lambda p,s,d: route(p,"[ipif]",s,d)))
 238 start_http()
 239 common_run()