#!/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, saddr, daddr): print('TRACE ', saddr, daddr, packet) try: dclient = clients[daddr] except KeyError: dclient = None if dclient is not None: dclient.queue_outbound(packet) elif daddr == c.server or daddr not in c.network: print('TRACE INBOUND ', saddr, daddr, packet) queue_inbound(packet) elif daddr == relay: log_discard(packet, saddr, daddr, 'relay') else: log_discard(packet, 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 # .max_request_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','max_request_time', 'target_requests_outstanding'): req = cfg.getint(cs, k) limit = cfg.getint('limits',k) self.__dict__[k] = min(req, limit) self._pq = PacketQueue(self.max_queue_time) if ip in clients: raise ValueError('multiple client cfg sections for %s' % ip) clients[ip] = self def process_arriving_data(self, d): for packet in slip.decode(d): (saddr, daddr) = packet_addrs(packet) if saddr != self._ip: raise ValueError('wrong source address %s' % saddr) route(packet, saddr, daddr) def _req_cancel(self, request): request.finish() def _req_error(self, err, request): self._req_cancel(request) def queue_outbound(self, packet): self._pq.append(packet) self._check_outbound() def http_request(self, request): request.setHeader('Content-Type','application/octet-stream') reactor.callLater(self.max_request_time, self._req_cancel, request) request.notifyFinish().addErrback(self._req_error, request) self._rq.append(request) self._check_outbound() def _check_outbound(self): while True: try: request = self._rq[0] except IndexError: request = None if request and request.finished: self._rq.popleft() continue if not self._pq.nonempty(): # no packets, oh well continue if request is None: # no request break # request, and also some non-expired packets self._pq.process((lambda: request.sentLength), request.write, self.max_batch_down) assert(request.sentLength) self._rq.popleft() request.finish() # round again, looking for more to do while len(self._rq) > self.target_requests_outstanding: request = self._rq.popleft() request.finish() def process_request(request): # find client, update config, etc. metadata = request.args['m'] (ci_s, pw, tro) = metadata.split(b'\n')[0:3] ci = ipaddr(ci_s) cl = clients[ci] if pw != cl.pw: raise ValueError('bad password') if pw != cl.target_requests_outstanding: raise ... try: d = request.args['d'] except KeyError: d = '' cl.process_arriving_data(d) cl.new_request(request) class IphttpResource(twisted.web.resource.Resource): isLeaf = True def render_POST(self, request): try: process_request(request) except Exception as e: request.setHeader('Content-Type','text/plain; charset="utf-8"') request.setResponseCode(400) request.write(str(e).encode('utf-8')) request.finish def render_GET(self, 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)) #---------- 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, route) start_http() common_run()