X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=hippotat.git;a=blobdiff_plain;f=server;h=db13f25954d01ff4ad24fe6fbd6bb4305e0d2995;hp=775a0c34362458b93dffc0ec3fb6ade28b054e35;hb=650a3251620a44d22f30a4242cea6fff88ccfba5;hpb=ce7f1431dbc8ca547149f6295ae79077e678d03d diff --git a/server b/server index 775a0c3..db13f25 100755 --- a/server +++ b/server @@ -1,18 +1,16 @@ #!/usr/bin/python3 +import signal +signal.signal(signal.SIGINT, signal.SIG_DFL) + import sys import os -import twisted import twisted.internet import twisted.internet.endpoints -from twisted.internet import reactor from twisted.web.server import NOT_DONE_YET from twisted.logger import LogLevel -import ipaddress -from ipaddress import AddressValueError - #import twisted.web.server import Site #from twisted.web.resource import Resource @@ -24,27 +22,16 @@ import collections import syslog -clients = { } - -def ipaddr(input): - try: - r = ipaddress.IPv4Address(input) - except AddressValueError: - r = ipaddress.IPv6Address(input) - return r +from hippotat import * -def ipnetwork(input): - try: - r = ipaddress.IPv4Network(input) - except NetworkValueError: - r = ipaddress.IPv6Network(input) - return r +clients = { } defcfg = ''' [DEFAULT] max_batch_down = 65536 max_queue_time = 10 max_request_time = 54 +target_requests_outstanding = 3 [virtual] mtu = 1500 @@ -55,22 +42,41 @@ mtu = 1500 [server] ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s addrs = 127.0.0.1 ::1 -port = 80 +port = 8099 [limits] max_batch_down = 262144 max_queue_time = 121 max_request_time = 121 +target_requests_outstanding = 10 ''' +#---------- error handling ---------- + +def crash(err): + print('CRASH ', err, file=sys.stderr) + try: reactor.stop() + except twisted.internet.error.ReactorNotRunning: pass + +def crash_on_defer(defer): + defer.addErrback(lambda err: crash(err)) + +def crash_on_critical(event): + if event.get('log_level') >= LogLevel.critical: + crash(twisted.logger.formatEvent(event)) + #---------- "router" ---------- -def route(packet, daddr): +def route(packet, saddr, daddr): + print('TRACE ', saddr, daddr, packet) try: client = clients[daddr] except KeyError: dclient = None if dclient is not None: dclient.queue_outbound(packet) + elif saddr.is_link_local or daddr.is_link_local: + log_discard(packet, saddr, daddr, 'link-local') elif daddr == host or daddr not in network: + print('TRACE INBOUND ', saddr, daddr, packet) queue_inbound(packet) elif daddr == relay: log_discard(packet, saddr, daddr, 'relay') @@ -78,76 +84,9 @@ def route(packet, daddr): log_discard(packet, saddr, daddr, 'no client') def log_discard(packet, saddr, daddr, why): - syslog.syslog(syslog.LOG_DEBUG, - 'discarded packet %s -> %s (%s)' % (saddr, daddr, why)) - -#---------- ipif (slip subprocess) ---------- - -class IpifProcessProtocol(twisted.internet.protocol.ProcessProtocol): - def __init__(self): - self._buffer = b'' - def connectionMade(self): pass - def outReceived(self, data): - #print('RECV ', repr(data)) - self._buffer += data - packets = slip_decode(self._buffer) - self._buffer = packets.pop() - for packet in packets: - (saddr, daddr) = packet_addrs(packet) - route(packet, daddr) - def processEnded(self, status): - status.raiseException() - -def start_ipif(): - global ipif - ipif = IpifProcessProtocol() - reactor.spawnProcess(ipif, - '/bin/sh',['sh','-xc', ipif_command], - childFDs={0:'w', 1:'r', 2:2}) - -def queue_inbound(packet): - ipif.transport.write(slip_delimiter) - ipif.transport.write(slip_encode(packet)) - ipif.transport.write(slip_delimiter) - -#---------- SLIP handling ---------- - -slip_end = b'\300' -slip_esc = b'\333' -slip_esc_end = b'\334' -slip_esc_esc = b'\335' -slip_delimiter = slip_end - -def slip_encode(packet): - return (packet - .replace(slip_esc, slip_esc + slip_esc_esc) - .replace(slip_end, slip_esc + slip_esc_end)) - -def slip_decode(data): - print('DECODE ', repr(data)) - out = [] - for packet in data.split(slip_end): - pdata = b'' - while True: - eix = packet.find(slip_esc) - if eix == -1: - pdata += packet - break - #print('ESC ', repr((pdata, packet, eix))) - pdata += packet[0 : eix] - ck = packet[eix+1] - if ck == slip_esc_esc: pdata += slip_esc - elif ck == slip_esc_end: pdata += slip_end - else: raise ValueError('invalid SLIP escape') - packet = packet[eix+2 : ] - out.append(pdata) - print('DECODED ', repr(out)) - return out - -#---------- packet parsing ---------- - -def packet_addrs(packet): - pass + print('DROP ', saddr, daddr, why) +# syslog.syslog(syslog.LOG_DEBUG, +# 'discarded packet %s -> %s (%s)' % (saddr, daddr, why)) #---------- client ---------- @@ -158,22 +97,25 @@ class Client(): self._cs = cs self.pw = cfg.get(cs, 'password') self._rq = collections.deque() # requests - self._pq = collections.deque() # packets + # self._pq = PacketQueue(...) # plus from config: # .max_batch_down # .max_queue_time # .max_request_time - for k in ('max_batch_down','max_queue_time','max_request_time'): + # .target_requests_outstanding + 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) def process_arriving_data(self, d): - for packet in slip_decode(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, daddr) + route(packet, saddr, daddr) def _req_cancel(self, request): request.finish() @@ -182,7 +124,7 @@ class Client(): self._req_cancel(request) def queue_outbound(self, packet): - self._pq.append((time.monotonic(), packet)) + self._pq.append(packet) def http_request(self, request): request.setHeader('Content-Type','application/octet-stream') @@ -199,15 +141,8 @@ class Client(): self._rq.popleft() continue - # now request is an unfinished request, or None - try: (queuetime, packet) = self._pq[0] - except IndexError: + if not self._pq.nonempty(): # no packets, oh well - break - - age = time.monotonic() - queuetime - if age > self.max_queue_time: - self._pq.popleft() continue if request is None: @@ -216,16 +151,16 @@ class Client(): # request, and also some non-expired packets while True: - try: (dummy, packet) = self._pq[0] - except IndexError: break + packet = self.pq.popleft() + if packet is None: break - encoded = slip_encode(packet) + encoded = slip.encode(packet) if request.sentLength > 0: - if (request.sentLength + len(slip_delimiter) + if (request.sentLength + len(slip.delimiter) + len(encoded) > self.max_batch_down): break - request.write(slip_delimiter) + request.write(slip.delimiter) request.write(encoded) self._pq.popLeft() @@ -235,7 +170,12 @@ class Client(): request.finish() # round again, looking for more to do + while len(self._rq) > self.target_requests_outstanding: + request = self._rq.popleft() + request.finish() + class IphttpResource(twisted.web.resource.Resource): + isLeaf = True def render_POST(self, request): # find client, update config, etc. ci = ipaddr(request.args['i']) @@ -246,7 +186,8 @@ class IphttpResource(twisted.web.resource.Resource): # update config for r, w in (('mbd', 'max_batch_down'), ('mqt', 'max_queue_time'), - ('mrt', 'max_request_time')): + ('mrt', 'max_request_time'), + ('tro', 'target_requests_outstanding')): try: v = request.args[r] except KeyError: continue v = int(v) @@ -258,9 +199,12 @@ class IphttpResource(twisted.web.resource.Resource): c.process_arriving_data(d) c.new_request(request) + def render_GET(self, request): + return b'hippotat' + def start_http(): resource = IphttpResource() - sitefactory = twisted.web.server.Site(resource) + site = twisted.web.server.Site(resource) for addrspec in cfg.get('server','addrs').split(): try: addr = ipaddress.IPv4Address(addrspec) @@ -269,7 +213,7 @@ def start_http(): addr = ipaddress.IPv6Address(addrspec) endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint ep = endpointfactory(reactor, cfg.getint('server','port'), addr) - ep.listen(sitefactory) + crash_on_defer(ep.listen(site)) #---------- config and setup ---------- @@ -314,14 +258,6 @@ def process_cfg(): ipif_command = cfg.get('server','ipif', vars=iic_vars) -def crash_on_critical(event): - if event.get('log_level') >= LogLevel.critical: - print('crashing: ', twisted.logger.formatEvent(event), file=sys.stderr) - #print('crashing!', file=sys.stderr) - #os._exit(1) - try: reactor.stop() - except twisted.internet.error.ReactorNotRunning: pass - def startup(): global cfg @@ -339,8 +275,9 @@ def startup(): cfg.read(opts.configfile) process_cfg() - start_ipif() + start_ipif(ipif_command, route) start_http() startup() reactor.run() +print('CRASHED (end)', file=sys.stderr)