#!/usr/bin/python3 from hippotat import * import os import twisted.internet from twisted.web.server import NOT_DONE_YET #import twisted.web.server import Site #from twisted.web.resource import Resource import syslog clients = { } #---------- "router" ---------- def route(packet, iface, saddr, daddr): def lt(dest): log_debug(DBG.ROUTE, 'route: %s -> %s: %s' % (saddr,daddr,dest), d=packet) try: dclient = clients[daddr] except KeyError: dclient = None if dclient is not None: lt('client') dclient.queue_outbound(packet) elif daddr == c.server or daddr not in c.network: lt('inbound') queue_inbound(packet) elif daddr == relay: lt('discard relay') log_discard(packet, iface, saddr, daddr, 'relay') else: lt('discard no-client') log_discard(packet, iface, saddr, daddr, 'no-client') #---------- client ---------- class Client(): def __init__(self, ip, cs, pw): # instance data members self._ip = ip self._cs = cs self.pw = pw self._rq = collections.deque() # requests # self._pq = PacketQueue(...) # plus from config: # .max_batch_down # .max_queue_time # .target_requests_outstanding if ip not in c.network: raise ValueError('client %s not in network' % ip) for k in ('max_batch_down','max_queue_time','http_timeout', 'target_requests_outstanding'): req = cfg.getint(cs, k) limit = cfg.getint('limits',k) self.__dict__[k] = min(req, limit) self._pq = PacketQueue(str(ip), self.max_queue_time) if ip in clients: raise ValueError('multiple client cfg sections for %s' % ip) clients[ip] = self self._log(DBG.INIT, 'new') def _log(self, dflag, msg, **kwargs): log_debug(dflag, ('client %s: ' % self._ip)+msg, **kwargs) def process_arriving_data(self, d): self._log(DBG.FLOW, "req data (enc'd)", d=d) if not len(d): return for packet in slip.decode(d): (saddr, daddr) = packet_addrs(packet) if saddr != self._ip: raise ValueError('wrong source address %s' % saddr) route(packet, self._ip, saddr, daddr) def _req_cancel(self, request): self._log(DBG.HTTP_CTRL, 'cancel', idof=request) request.finish() def _req_error(self, err, request): self._log(DBG.HTTP_CTRL, 'error %s' % err, idof=request) self._req_cancel(request) def queue_outbound(self, packet): self._pq.append(packet) self._check_outbound() def new_request(self, request): request.setHeader('Content-Type','application/octet-stream') reactor.callLater(self.http_timeout, self._req_cancel, request) request.notifyFinish().addErrback(self._req_error, request) self._rq.append(request) self._check_outbound() def _req_write(self, req, d): self._log(DBG.HTTP, 'req_write ', idof=req, d=d) req.write(d) def _check_outbound(self): log_debug(DBG.HTTP_CTRL, 'CHKO') while True: try: request = self._rq[0] except IndexError: request = None if request and request.finished: self._log(DBG.HTTP_CTRL, 'CHKO req finished, discard', idof=request) self._rq.popleft() continue if not self._pq.nonempty(): # no packets, oh well self._log(DBG.HTTP_CTRL, 'CHKO no packets, OUT-DONE', idof=request) break if request is None: # no request self._log(DBG.HTTP_CTRL, 'CHKO no request, OUT-DONE', idof=request) break self._log(DBG.HTTP_CTRL, 'CHKO processing', idof=request) # request, and also some non-expired packets self._pq.process((lambda: request.sentLength), (lambda d: self._req_write(request, d)), self.max_batch_down) assert(request.sentLength) self._rq.popleft() request.finish() self._log(DBG.HTTP, 'complete', idof=request) # round again, looking for more to do while len(self._rq) > self.target_requests_outstanding: request = self._rq.popleft() self._log(DBG.HTTP, 'CHKO above target, returning empty', idof=request) request.finish() def process_request(request, desca): # find client, update config, etc. metadata = request.args[b'm'][0] metadata = metadata.split(b'\r\n') (ci_s, pw, tro, cto) = metadata[0:4] desca['m[0,2:3]'] = [ci_s, tro, cto] ci_s = ci_s.decode('utf-8') tro = int(tro); desca['tro']= tro cto = int(cto); desca['cto']= cto ci = ipaddr(ci_s) desca['ci'] = ci cl = clients[ci] if pw != cl.pw: raise ValueError('bad password') desca['pwok']=True if tro != cl.target_requests_outstanding: raise ValueError('tro must be %d' % cl.target_requests_outstanding) if cto < cl.http_timeout: raise ValueError('cto must be >= %d' % cl.http_timeout) try: d = request.args[b'd'][0] desca['d'] = d desca['dlen'] = len(d) except KeyError: d = b'' desca['dlen'] = None log_http(desca, 'processing', idof=id(request), d=d) d = mime_translate(d) cl.process_arriving_data(d) cl.new_request(request) def log_http(desca, msg, **kwargs): try: kwargs['d'] = desca['d'] del desca['d'] except KeyError: pass log_debug(DBG.HTTP, msg + repr(desca), **kwargs) class IphttpResource(twisted.web.resource.Resource): isLeaf = True def render_POST(self, request): log_debug(DBG.HTTP_FULL, 'req recv: ' + repr(request) + ' ' + repr(request.args), idof=id(request)) desca = {'d': None} try: process_request(request, desca) except Exception as e: emsg = traceback.format_exc() log_http(desca, 'RETURNING EXCEPTION ' + emsg) request.setHeader('Content-Type','text/plain; charset="utf-8"') request.setResponseCode(400) return (emsg + ' # ' + repr(desca) + '\r\n').encode('utf-8') log_debug(DBG.HTTP_CTRL, '...', idof=id(request)) return NOT_DONE_YET def render_GET(self, request): log_debug(DBG.HTTP, 'GET request') return b'hippotat' def start_http(): resource = IphttpResource() site = twisted.web.server.Site(resource) for sa in c.saddrs: ep = sa.make_endpoint() crash_on_defer(ep.listen(site)) log_debug(DBG.INIT, 'listening on %s' % sa) #---------- config and setup ---------- def process_cfg(): process_cfg_common_always() process_cfg_server() process_cfg_network() try: c.relay = cfg.get('virtual','relay') except NoOptionError: for search in c.network.hosts(): if search == c.server: continue c.relay = search break process_cfg_saddrs() process_cfg_clients(Client) process_cfg_ipif('server', (('local','server'), ('peer', 'relay'), ('rnets','network'))) common_startup() process_cfg() start_ipif(c.ipif_command, (lambda p,s,d: route(p,"[ipif]",s,d))) start_http() common_run()