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