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