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