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

   1 #!/usr/bin/python3
   2
   3 from hippotat import *
   4
   5 import sys
   6 import os
   7
   8 import twisted.internet
   9 from twisted.web.server import NOT_DONE_YET
  10
  11 #import twisted.web.server import Site
  12 #from twisted.web.resource import Resource
  13
  14 import syslog
  15
  16 clients = { }
  17
  18 #---------- "router" ----------
  19
  20 def route(packet, saddr, daddr):
  21   print('TRACE ', saddr, daddr, packet)
  22   try: client = clients[daddr]
  23   except KeyError: dclient = None
  24   if dclient is not None:
  25     dclient.queue_outbound(packet)
  26   elif daddr == c.server or daddr not in c.network:
  27     print('TRACE INBOUND ', saddr, daddr, packet)
  28     queue_inbound(packet)
  29   elif daddr == relay:
  30     log_discard(packet, saddr, daddr, 'relay')
  31   else:
  32     log_discard(packet, saddr, daddr, 'no client')
  33
  34 def log_discard(packet, saddr, daddr, why):
  35   print('DROP ', saddr, daddr, why)
  36 #  syslog.syslog(syslog.LOG_DEBUG,
  37 #                'discarded packet %s -> %s (%s)' % (saddr, daddr, why))
  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(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   def process_arriving_data(self, d):
  71     for packet in slip.decode(d):
  72       (saddr, daddr) = packet_addrs(packet)
  73       if saddr != self._ip:
  74         raise ValueError('wrong source address %s' % saddr)
  75       route(packet, saddr, daddr)
  76
  77   def _req_cancel(self, request):
  78     request.finish()
  79
  80   def _req_error(self, err, request):
  81     self._req_cancel(request)
  82
  83   def queue_outbound(self, packet):
  84     self._pq.append(packet)
  85     self._check_outbound()
  86
  87   def http_request(self, request):
  88     request.setHeader('Content-Type','application/octet-stream')
  89     reactor.callLater(self.max_request_time, self._req_cancel, request)
  90     request.notifyFinish().addErrback(self._req_error, request)
  91     self._rq.append(request)
  92     self._check_outbound()
  93
  94   def _check_outbound(self):
  95     while True:
  96       try: request = self._rq[0]
  97       except IndexError: request = None
  98       if request and request.finished:
  99         self._rq.popleft()
 100         continue
 101
 102       if not self._pq.nonempty():
 103         # no packets, oh well
 104         continue
 105
 106       if request is None:
 107         # no request
 108         break
 109
 110       # request, and also some non-expired packets
 111       while True:
 112         packet = self.pq.popleft()
 113         if packet is None: break
 114
 115         encoded = slip.encode(packet)
 116
 117         if request.sentLength > 0:
 118           if (request.sentLength + len(slip.delimiter)
 119               + len(encoded) > self.max_batch_down):
 120             break
 121           request.write(slip.delimiter)
 122
 123         request.write(encoded)
 124         self._pq.popLeft()
 125
 126       assert(request.sentLength)
 127       self._rq.popLeft()
 128       request.finish()
 129       # round again, looking for more to do
 130
 131     while len(self._rq) > self.target_requests_outstanding:
 132       request = self._rq.popleft()
 133       request.finish()
 134
 135 class IphttpResource(twisted.web.resource.Resource):
 136   isLeaf = True
 137   def render_POST(self, request):
 138     # find client, update config, etc.
 139     metadata = request.args['m']
 140     (ci_s, pw, tro) = metadata.split(b'\n')[0:3]
 141     ci = ipaddr(ci_s])
 142     cl = clients[ci]
 143     if pw != cl.pw: raise ValueError('bad password')
 144
 145     if pw != cl.target_requests_outstanding:
 146       raise ...
 147
 148     try: d = request.args['d']
 149     except KeyError: d = ''
 150
 151     cl.process_arriving_data(d)
 152     cl.new_request(request)
 153
 154   def render_GET(self, request):
 155     return b'<html><body>hippotat</body></html>'
 156
 157 def start_http():
 158   resource = IphttpResource()
 159   site = twisted.web.server.Site(resource)
 160   for sa in c.saddrs:
 161     ep = sa.make_endpoint()
 162     crash_on_defer(ep.listen(site))
 163
 164 #---------- config and setup ----------
 165
 166 def process_cfg():
 167   process_cfg_common_always()
 168   process_cfg_server()
 169   process_cfg_network()
 170
 171   try:
 172     c.relay = cfg.get('virtual','relay')
 173   except NoOptionError:
 174     for search in c.network.hosts():
 175       if search == c.server: continue
 176       c.relay = search
 177       break
 178
 179   process_cfg_saddrs()
 180   process_cfg_clients(Client)
 181
 182   process_cfg_ipif('server',
 183                    (('local','server'),
 184                     ('peer', 'relay'),
 185                     ('rnets','network')))
 186
 187 common_startup(defcfg)
 188 process_cfg()
 189 start_ipif(c.ipif_command, route)
 190 start_http()
 191 common_run()