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

   1 #!/usr/bin/python3
   2 #
   3 # Hippotat - Asinine IP Over HTTP program
   4 # ./hippotat - client main program
   5 #
   6 # Copyright 2017 Ian Jackson
   7 #
   8 # GPLv3+
   9 #
  10 #    This program is free software: you can redistribute it and/or modify
  11 #    it under the terms of the GNU General Public License as published by
  12 #    the Free Software Foundation, either version 3 of the License, or
  13 #    (at your option) any later version.
  14 #
  15 #    This program is distributed in the hope that it will be useful,
  16 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 #    GNU General Public License for more details.
  19 #
  20 #    You should have received a copy of the GNU General Public License
  21 #    along with this program, in the file GPLv3.  If not,
  22 #    see <http://www.gnu.org/licenses/>.
  23
  24 #@ import sys; sys.path.append('@PYBUILD_INSTALL_DIR@')
  25 from hippotatlib import *
  26
  27 import twisted.web
  28 import twisted.web.client
  29
  30 import io
  31
  32 class GeneralResponseConsumer(twisted.internet.protocol.Protocol):
  33   def __init__(self, cl, req, resp, desc):
  34     self._cl = cl
  35     self._req = req
  36     self._resp = resp
  37     self._desc = desc
  38
  39   def _log(self, dflag, msg, **kwargs):
  40     self._cl.log(dflag, '%s: %s' % (self._desc, msg), idof=self._req, **kwargs)
  41
  42   def connectionMade(self):
  43     self._log(DBG.HTTP_CTRL, 'connectionMade')
  44
  45   def connectionLostOK(self, reason):
  46     return (reason.check(twisted.web.client.ResponseDone) or
  47             reason.check(twisted.web.client.PotentialDataLoss))
  48     # twisted.web.client.PotentialDataLoss is an entirely daft
  49     # exception.  It will occur every time if the origin server does
  50     # not provide a Content-Length.  (hippotatd does, of course, but
  51     # the HTTP transaction might be proxied.)
  52
  53 class ResponseConsumer(GeneralResponseConsumer):
  54   def __init__(self, cl, req, resp):
  55     super().__init__(cl, req, resp, 'RC')
  56     ssddesc = '[%s] %s' % (id(req), self._desc)
  57     self._ssd = SlipStreamDecoder(ssddesc, partial(queue_inbound, cl.ipif))
  58     self._log(DBG.HTTP_CTRL, '__init__')
  59
  60   def dataReceived(self, data):
  61     self._log(DBG.HTTP, 'dataReceived', d=data)
  62     try:
  63       self._ssd.inputdata(data)
  64     except Exception as e:
  65       self._handleexception()
  66
  67   def connectionLost(self, reason):
  68     reason_msg = 'connectionLost ' + str(reason)
  69     self._log(DBG.HTTP_CTRL, reason_msg)
  70     if not self.connectionLostOK(reason):
  71       self._latefailure(reason_msg)
  72       return
  73     try:
  74       self._log(DBG.HTTP, 'ResponseDone')
  75       self._ssd.flush()
  76       self._cl.req_fin(self._req)
  77     except Exception as e:
  78       self._handleexception()
  79     self._cl.report_running()
  80
  81   def _handleexception(self):
  82     self._latefailure(traceback.format_exc())
  83
  84   def _latefailure(self, reason):
  85     self._log(DBG.HTTP_CTRL, '_latefailure ' + str(reason))
  86     self._cl.req_err(self._req, reason)
  87
  88 class ErrorResponseConsumer(GeneralResponseConsumer):
  89   def __init__(self, cl, req, resp):
  90     super().__init__(cl, req, resp, 'ERROR-RC')
  91     self._m = b''
  92     try:
  93       self._phrase = resp.phrase.decode('utf-8')
  94     except Exception:
  95       self._phrase = repr(resp.phrase)
  96     self._log(DBG.HTTP_CTRL, '__init__ %d %s' % (resp.code, self._phrase))
  97
  98   def dataReceived(self, data):
  99     self._log(DBG.HTTP_CTRL, 'dataReceived ' + repr(data))
 100     self._m += data
 101
 102   def connectionLost(self, reason):
 103     try:
 104       mbody = self._m.decode('utf-8')
 105     except Exception:
 106       mbody = repr(self._m)
 107     if not self.connectionLostOK(reason):
 108       mbody += ' || ' + str(reason)
 109     self._cl.req_err(self._req,
 110             "FAILED %d %s | %s"
 111             % (self._resp.code, self._phrase, mbody))
 112
 113 class Client():
 114   def __init__(cl, c,ss,cs):
 115     cl.c = c
 116     cl.outstanding = { }
 117     cl.desc = '[%s %s] ' % (ss,cs)
 118     cl.running_reported = False
 119     cl.log_info('setting up')
 120
 121   def log_info(cl, msg):
 122     log.info(cl.desc + msg, dflag=False)
 123
 124   def report_running(cl):
 125     if not cl.running_reported:
 126       cl.log_info('running OK')
 127       cl.running_reported = True
 128
 129   def log(cl, dflag, msg, **kwargs):
 130     log_debug(dflag, cl.desc + msg, **kwargs)
 131
 132   def log_outstanding(cl):
 133     cl.log(DBG.CTRL_DUMP, 'OS %s' % cl.outstanding)
 134
 135   def start(cl):
 136     cl.queue = PacketQueue('up', cl.c.max_queue_time)
 137     cl.agent = twisted.web.client.Agent(
 138       reactor, connectTimeout = cl.c.http_timeout)
 139
 140   def outbound(cl, packet, saddr, daddr):
 141     #print('OUT ', saddr, daddr, repr(packet))
 142     cl.queue.append(packet)
 143     cl.check_outbound()
 144
 145   def req_ok(cl, req, resp):
 146     cl.log(DBG.HTTP_CTRL,
 147             'req_ok %d %s %s' % (resp.code, repr(resp.phrase), str(resp)),
 148             idof=req)
 149     if resp.code == 200:
 150       rc = ResponseConsumer(cl, req, resp)
 151     else:
 152       rc = ErrorResponseConsumer(cl, req, resp)
 153
 154     resp.deliverBody(rc)
 155     # now rc is responsible for calling req_fin
 156
 157   def req_err(cl, req, err):
 158     # called when the Deferred fails, or (if it completes),
 159     # later, by ResponsConsumer or ErrorResponsConsumer
 160     try:
 161       cl.log(DBG.HTTP_CTRL, 'req_err ' + str(err), idof=req)
 162       cl.running_reported = False
 163       if isinstance(err, twisted.python.failure.Failure):
 164         err = err.getTraceback()
 165       print('%s[%#x] %s' % (cl.desc, id(req), err.strip('\n').replace('\n',' / ')),
 166             file=sys.stderr)
 167       if not isinstance(cl.outstanding[req], int):
 168         raise RuntimeError('[%#x] previously %s' %
 169                            (id(req), cl.outstanding[req]))
 170       cl.outstanding[req] = err
 171       cl.log_outstanding()
 172       reactor.callLater(cl.c.http_retry, partial(cl.req_fin, req))
 173     except Exception as e:
 174       crash(traceback.format_exc() + '\n----- handling -----\n' + err)
 175
 176   def req_fin(cl, req):
 177     del cl.outstanding[req]
 178     cl.log(DBG.HTTP_CTRL, 'req_fin OS=%d' % len(cl.outstanding), idof=req)
 179     cl.check_outbound()
 180
 181   def check_outbound(cl):
 182     while True:
 183       if len(cl.outstanding) >= cl.c.max_outstanding:
 184         break
 185
 186       if (not cl.queue.nonempty() and
 187           len(cl.outstanding) >= cl.c.target_requests_outstanding):
 188         break
 189
 190       d = b''
 191       def moredata(s): nonlocal d; d += s
 192       cl.queue.process((lambda: len(d)),
 193                     moredata,
 194                     cl.c.max_batch_up)
 195
 196       d = mime_translate(d)
 197
 198       token = authtoken_make(cl.c.secret)
 199
 200       crlf = b'\r\n'
 201       lf   =   b'\n'
 202       mime = (b'--b'                                        + crlf +
 203               b'Content-Type: text/plain; charset="utf-8"'  + crlf +
 204               b'Content-Disposition: form-data; name="m"'   + crlf + crlf +
 205               str(cl.c.client)            .encode('ascii')  + crlf +
 206               token                                         + crlf +
 207               str(cl.c.target_requests_outstanding)
 208                                           .encode('ascii')  + crlf +
 209               str(cl.c.http_timeout)      .encode('ascii')  + crlf +
 210             ((
 211               b'--b'                                        + crlf +
 212               b'Content-Type: application/octet-stream'     + crlf +
 213               b'Content-Disposition: form-data; name="d"'   + crlf + crlf +
 214               d                                             + crlf
 215              ) if len(d) else b'')                               +
 216               b'--b--'                                      + crlf)
 217
 218       #df = open('data.dump.dbg', mode='wb')
 219       #df.write(mime)
 220       #df.close()
 221       # POST -use -c 'multipart/form-data; boundary="b"' http://localhost:8099/ <data.dump.dbg
 222
 223       cl.log(DBG.HTTP_FULL, 'requesting: ' + str(mime))
 224
 225       hh = { 'User-Agent': ['hippotat'],
 226              'Content-Type': ['multipart/form-data; boundary="b"'],
 227              'Content-Length': [str(len(mime))] }
 228
 229       bytesreader = io.BytesIO(mime)
 230       producer = twisted.web.client.FileBodyProducer(bytesreader)
 231
 232       req = cl.agent.request(b'POST',
 233                           cl.c.url,
 234                           twisted.web.client.Headers(hh),
 235                           producer)
 236
 237       cl.outstanding[req] = len(d)
 238       cl.log(DBG.HTTP_CTRL,
 239              'request OS=%d' % len(cl.outstanding),
 240              idof=req, d=d)
 241       req.addTimeout(cl.c.http_timeout, reactor)
 242       req.addCallback(partial(cl.req_ok, req))
 243       req.addErrback(partial(cl.req_err, req))
 244
 245     cl.log_outstanding()
 246
 247 clients = [ ]
 248
 249 def process_cfg(_opts, putative_servers, putative_clients):
 250   global clients
 251
 252   for ss in putative_servers.values():
 253     for (ci,cs) in putative_clients.items():
 254       c = ConfigResults()
 255
 256       sections = cfg_process_client_common(c,ss,cs,ci)
 257       if not sections: continue
 258
 259       log_debug_config('processing client [%s %s]' % (ss, cs))
 260
 261       def srch(getter,key): return cfg_search(getter,key,sections)
 262
 263       c.http_timeout   += srch(cfg.getint, 'http_timeout_grace')
 264       c.max_outstanding = srch(cfg.getint, 'max_requests_outstanding')
 265       c.max_batch_up    = srch(cfg.getint, 'max_batch_up')
 266       c.http_retry      = srch(cfg.getint, 'http_retry')
 267       c.max_queue_time  = srch(cfg.getint, 'max_queue_time')
 268       c.vroutes         = srch(cfg.get,    'vroutes')
 269
 270       try: c.ifname     = srch(cfg_get_raw, 'ifname_client')
 271       except NoOptionError: pass
 272
 273       try: c.url = srch(cfg.get,'url')
 274       except NoOptionError:
 275         cfg_process_saddrs(c, ss)
 276         c.url = c.saddrs[0].url()
 277
 278       c.client = ci
 279
 280       cfg_process_vaddr(c,ss)
 281
 282       cfg_process_ipif(c,
 283                        sections,
 284                        (('local','client'),
 285                         ('peer', 'vaddr'),
 286                         ('rnets','vroutes')))
 287
 288       clients.append(Client(c,ss,cs))
 289
 290 common_startup(process_cfg)
 291
 292 for cl in clients:
 293   cl.start()
 294   cl.ipif = start_ipif(cl.c.ipif_command, cl.outbound)
 295   cl.check_outbound()
 296
 297 common_run()