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

   1 #!/usr/bin/python3
   2 #
   3 # Hippotat - Asinine IP Over HTTP program
   4 # ./hippotatd - server main program
   5 #
   6 # Copyright 2017 Ian Jackson
   7 #
   8 # AGPLv3+ + CAFv2+
   9 #
  10 #    This program is free software: you can redistribute it and/or
  11 #    modify it under the terms of the GNU Affero General Public
  12 #    License as published by the Free Software Foundation, either
  13 #    version 3 of the License, or (at your option) any later version,
  14 #    with the "CAF Login Exception" as published by Ian Jackson
  15 #    (version 2, or at your option any later version) as an Additional
  16 #    Permission.
  17 #
  18 #    This program is distributed in the hope that it will be useful,
  19 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21 #    Affero General Public License for more details.
  22 #
  23 #    You should have received a copy of the GNU Affero General Public
  24 #    License and the CAF Login Exception along with this program, in
  25 #    the file AGPLv3+CAFv2.  If not, email Ian Jackson
  26 #    <ijackson@chiark.greenend.org.uk>.
  27
  28
  29 from hippotatlib import *
  30
  31 import os
  32 import tempfile
  33 import atexit
  34 import shutil
  35
  36 import twisted.internet
  37 from twisted.web.server import NOT_DONE_YET
  38
  39 import twisted.web.static
  40 import twisted.python.syslog
  41
  42 import hippotatlib.ownsource
  43 from hippotatlib.ownsource import SourceShipmentPreparer
  44
  45 #import twisted.web.server import Site
  46 #from twisted.web.resource import Resource
  47
  48 import syslog
  49
  50 cleanups = [ ]
  51
  52 clients = { }
  53
  54 #---------- "router" ----------
  55
  56 def route(packet, iface, saddr, daddr):
  57   def lt(dest):
  58     log_debug(DBG.ROUTE, 'route: %s -> %s: %s' % (saddr,daddr,dest), d=packet)
  59   try: dclient = clients[daddr]
  60   except KeyError: dclient = None
  61   if dclient is not None:
  62     lt('client')
  63     dclient.queue_outbound(packet)
  64   elif daddr == c.vaddr or daddr not in c.vnetwork:
  65     lt('inbound')
  66     queue_inbound(ipif, packet)
  67   elif daddr == c.relay:
  68     lt('discard relay')
  69     log_discard(packet, iface, saddr, daddr, 'relay')
  70   else:
  71     lt('discard no-client')
  72     log_discard(packet, iface, saddr, daddr, 'no-client')
  73
  74 #---------- client ----------
  75
  76 class Client():
  77   def __init__(self, ip, cc):
  78     # instance data members
  79     self._ip = ip
  80     self.cc = cc
  81     self._rq = collections.deque() # requests
  82     self._pq = PacketQueue(str(ip), self.cc.max_queue_time)
  83
  84     if ip not in c.vnetwork:
  85       raise ValueError('client %s not in vnetwork' % ip)
  86
  87     if ip in clients:
  88       raise ValueError('multiple client cfg sections for %s' % ip)
  89     clients[ip] = self
  90
  91     self._log(DBG.INIT, 'new')
  92
  93   def _log(self, dflag, msg, **kwargs):
  94     log_debug(dflag, ('client %s: ' % self._ip)+msg, **kwargs)
  95
  96   def process_arriving_data(self, d):
  97     self._log(DBG.FLOW, "req data (enc'd)", d=d)
  98     if not len(d): return
  99     for packet in slip.decode(d):
 100       (saddr, daddr) = packet_addrs(packet)
 101       if saddr != self._ip:
 102         raise ValueError('wrong source address %s' % saddr)
 103       route(packet, self._ip, saddr, daddr)
 104
 105   def _req_cancel(self, request):
 106     self._log(DBG.HTTP_CTRL, 'cancel', idof=request)
 107     request.finish()
 108
 109   def _req_error(self, err, request):
 110     self._log(DBG.HTTP_CTRL, 'error %s' % err, idof=request)
 111     self._req_cancel(request)
 112
 113   def queue_outbound(self, packet):
 114     self._pq.append(packet)
 115     self._check_outbound()
 116
 117   def _req_fin(self, dummy, request, cl):
 118     self._log(DBG.HTTP_CTRL, '_req_fin ' + repr(dummy), idof=request)
 119     try: cl.cancel()
 120     except twisted.internet.error.AlreadyCalled: pass
 121
 122   def new_request(self, request):
 123     request.setHeader('Content-Type','application/octet-stream')
 124     cl = reactor.callLater(self.cc.http_timeout, self._req_cancel, request)
 125     nf = request.notifyFinish()
 126     nf.addErrback(self._req_error, request)
 127     nf.addCallback(self._req_fin, request, cl)
 128     self._rq.append(request)
 129     self._check_outbound()
 130
 131   def _req_write(self, req, d):
 132     self._log(DBG.HTTP, 'req_write ', idof=req, d=d)
 133     req.write(d)
 134
 135   def _check_outbound(self):
 136     log_debug(DBG.HTTP_CTRL, 'CHKO')
 137     while True:
 138       try: request = self._rq[0]
 139       except IndexError: request = None
 140       if request and request.finished:
 141         self._log(DBG.HTTP_CTRL, 'CHKO req finished, discard', idof=request)
 142         self._rq.popleft()
 143         continue
 144
 145       if not self._pq.nonempty():
 146         # no packets, oh well
 147         self._log(DBG.HTTP_CTRL, 'CHKO no packets, OUT-DONE', idof=request)
 148         break
 149
 150       if request is None:
 151         # no request
 152         self._log(DBG.HTTP_CTRL, 'CHKO no request, OUT-DONE', idof=request)
 153         break
 154
 155       self._log(DBG.HTTP_CTRL, 'CHKO processing', idof=request)
 156       # request, and also some non-expired packets
 157       self._pq.process((lambda: request.sentLength),
 158                        (lambda d: self._req_write(request, d)),
 159                        self.cc.max_batch_down)
 160
 161       assert(request.sentLength)
 162       self._rq.popleft()
 163       request.finish()
 164       self._log(DBG.HTTP, 'complete', idof=request)
 165       # round again, looking for more to do
 166
 167     while len(self._rq) > self.cc.target_requests_outstanding:
 168       request = self._rq.popleft()
 169       self._log(DBG.HTTP, 'CHKO above target, returning empty', idof=request)
 170       request.finish()
 171
 172 def process_request(request, desca):
 173   # find client, update config, etc.
 174   metadata = request.args[b'm'][0]
 175   metadata = metadata.split(b'\r\n')
 176   (ci_s, pw, tro, cto) = metadata[0:4]
 177   desca['m[0,2:3]'] = [ci_s, tro, cto]
 178   ci_s = ci_s.decode('utf-8')
 179   tro = int(tro); desca['tro']= tro
 180   cto = int(cto); desca['cto']= cto
 181   ci = ipaddr(ci_s)
 182   desca['ci'] = ci
 183   cl = clients[ci]
 184   if pw != cl.cc.password: raise ValueError('bad password')
 185   desca['pwok']=True
 186
 187   if tro != cl.cc.target_requests_outstanding:
 188     raise ValueError('tro must be %d' % cl.cc.target_requests_outstanding)
 189
 190   if cto < cl.cc.http_timeout:
 191     raise ValueError('cto must be >= %d' % cl.cc.http_timeout)
 192
 193   try:
 194     d = request.args[b'd'][0]
 195     desca['d'] = d
 196     desca['dlen'] = len(d)
 197   except KeyError:
 198     d = b''
 199     desca['dlen'] = None
 200
 201   log_http(desca, 'processing', idof=id(request), d=d)
 202
 203   d = mime_translate(d)
 204
 205   cl.process_arriving_data(d)
 206   cl.new_request(request)
 207
 208 def log_http(desca, msg, **kwargs):
 209   try:
 210     kwargs['d'] = desca['d']
 211     del desca['d']
 212   except KeyError:
 213     pass
 214   log_debug(DBG.HTTP, msg + repr(desca), **kwargs)
 215
 216 class NotStupidResource(twisted.web.resource.Resource):
 217   # why this is not the default is a mystery!
 218   def getChild(self, name, request):
 219     if name == b'': return self
 220     else: return twisted.web.resource.Resource.getChild(name, request)
 221
 222 class IphttpResource(NotStupidResource):
 223   def render_POST(self, request):
 224     log_debug(DBG.HTTP_FULL,
 225               'req recv: ' + repr(request) + ' ' + repr(request.args),
 226               idof=id(request))
 227     desca = {'d': None}
 228     try: process_request(request, desca)
 229     except Exception as e:
 230       emsg = traceback.format_exc()
 231       log_http(desca, 'RETURNING EXCEPTION ' + emsg)
 232       request.setHeader('Content-Type','text/plain; charset="utf-8"')
 233       request.setResponseCode(400)
 234       return (emsg + ' # ' + repr(desca) + '\r\n').encode('utf-8')
 235     log_debug(DBG.HTTP_CTRL, '...', idof=id(request))
 236     return NOT_DONE_YET
 237
 238   # instantiator should set
 239   # self.hippotat_sources = (source_names[0], source_names[1])
 240   def __init__(self):
 241     self.hippotat_sources = [None, None]
 242     super().__init__()
 243
 244   def render_GET(self, request):
 245     log_debug(DBG.HTTP, 'GET request')
 246     s = '<html><body>hippotat\n'
 247     (s0,s1) = self.hippotat_sources
 248     if s0:
 249       s += '<p><a href="%s">source</a>\n' % s0
 250       if self.hippotat_sources[1]:
 251         s += ('(and that of dependency <a href="%s">packages</a>)\n' % s1)
 252       s += 'available'
 253     else:
 254       s += 'TESTING'
 255     s += '</body></html>'
 256     return s.encode('utf-8')
 257
 258 def start_http():
 259   resource = IphttpResource()
 260   site = twisted.web.server.Site(resource)
 261
 262   for sa in c.saddrs:
 263     ep = sa.make_endpoint()
 264     crash_on_defer(ep.listen(site))
 265     log_debug(DBG.INIT, 'listening on %s' % sa)
 266
 267   td = tempfile.mkdtemp()
 268
 269   def cleanup():
 270     try: shutil.rmtree(td)
 271     except FileNotFoundError: pass
 272
 273   cleanups.append(cleanup)
 274
 275   ssp = SourceShipmentPreparer(td)
 276   ssp.logger = partial(log_debug, DBG.OWNSOURCE)
 277   if DBG.OWNSOURCE in debug_set: ssp.stream_debug = sys.stdout
 278   ssp.download_packages = opts.ownsource >= 2
 279   if opts.ownsource >= 1: ssp.generate()
 280
 281   for ix in (0,1):
 282     bn = ssp.output_names[ix]
 283     op = ssp.output_paths[ix]
 284     if op is None: continue
 285     resource.hippotat_sources[ix] = bn
 286     subresource =twisted.web.static.File(op)
 287     resource.putChild(bn.encode('utf-8'), subresource)
 288
 289   reactor.callLater(0.1, (lambda: log.info('hippotatd started', dflag=False)))
 290
 291 #---------- config and setup ----------
 292
 293 def process_cfg(_opts, putative_servers, putative_clients):
 294   global opts
 295   opts = _opts
 296
 297   global c
 298   c = ConfigResults()
 299   c.server = cfg.get('SERVER','server')
 300
 301   cfg_process_common(c, c.server)
 302   cfg_process_saddrs(c, c.server)
 303   cfg_process_vnetwork(c, c.server)
 304   cfg_process_vaddr(c, c.server)
 305
 306   for (ci,cs) in putative_clients.items():
 307     cc = ConfigResults()
 308     sections = cfg_process_client_common(cc,c.server,cs,ci)
 309     if not sections: continue
 310     cfg_process_client_limited(cc,c.server,sections, 'max_batch_down')
 311     cfg_process_client_limited(cc,c.server,sections, 'max_queue_time')
 312     Client(ci, cc)
 313
 314   try:
 315     c.vrelay = cfg.get(c.server, 'vrelay')
 316   except NoOptionError:
 317     for search in c.vnetwork.hosts():
 318       if search == c.vaddr: continue
 319       c.vrelay = search
 320       break
 321
 322   cfg_process_ipif(c,
 323                    [c.server, 'DEFAULT'],
 324                    (('local','vaddr'),
 325                     ('peer', 'vrelay'),
 326                     ('rnets','vnetwork')))
 327
 328 def catch_termination():
 329   def run_cleanups():
 330     for cleanup in cleanups:
 331       cleanup()
 332
 333   atexit.register(run_cleanups)
 334
 335   def signal_handler(name, sig, *args):
 336     signal.signal(sig, signal.SIG_DFL)
 337     print('exiting due to %s' % name, file=sys.stderr)
 338     run_cleanups()
 339     os.kill(os.getpid(), sig)
 340     raise RuntimeError('did not die due to signal %s !' % name)
 341
 342   for sig in (signal.SIGINT, signal.SIGTERM):
 343     signal.signal(sig, partial(signal_handler, sig.name))
 344
 345 def daemonise():
 346   global syslogfacility
 347   if opts.daemon and opts.syslogfacility is None:
 348     opts.syslogfacility = 'daemon'
 349
 350   if opts.syslogfacility is not None:
 351     facilnum = syslog.__dict__['LOG_' + opts.syslogfacility.upper()]
 352     syslog.openlog('hippotatd',
 353                    facility=facilnum,
 354                    logoption=syslog.LOG_PID)
 355     def emit(event):
 356       m = twisted.logger.formatEvent(event)
 357       #print(repr(event), m, file=org_stderr)
 358       level = event.get('log_level')
 359       if   event.get('dflag',None) is not None: sl = syslog.LOG_DEBUG
 360       elif level == LogLevel.critical         : sl = syslog.LOG_CRIT
 361       elif level == LogLevel.error            : sl = syslog.LOG_ERR
 362       elif level == LogLevel.warn             : sl = syslog.LOG_WARNING
 363       else                                    : sl = syslog.LOG_INFO
 364       syslog.syslog(sl,m)
 365     glp = twisted.logger.globalLogPublisher
 366     glp.addObserver(emit)
 367     log_debug(DBG.INIT, 'starting to log to syslog')
 368
 369     glp.removeObserver(hippotatlib.file_log_observer)
 370
 371 optparser.add_option('--ownsource', default=2,
 372                      action='store_const', dest='ownsource', const=2,
 373                      help='source download fully enabled (default)')
 374
 375 optparser.add_option('--ownsource-local',
 376                      action='store_const', dest='ownsource', const=1,
 377                      help='source download is local source code only')
 378
 379 optparser.add_option('--no-ownsource',
 380                      action='store_const', dest='ownsource', const=0,
 381                      help='source download disabled (for testing only)')
 382
 383 optparser.add_option('--syslog-facility',
 384                      nargs=1, type='string',action='store',
 385                      metavar='FACILITY', dest='syslogfacility',
 386                      default=None,
 387                      help='log to syslog, with specified facility')
 388
 389 common_startup(process_cfg)
 390 catch_termination()
 391 ipif = start_ipif(c.ipif_command, (lambda p,s,d: route(p,"[ipif]",s,d)))
 392 start_http()
 393 daemonise()
 394 common_run()