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