| 1 | #!/usr/bin/python3 |
| 2 | |
| 3 | from hippotat import * |
| 4 | |
| 5 | import sys |
| 6 | import os |
| 7 | |
| 8 | import twisted.internet |
| 9 | import twisted.internet.endpoints |
| 10 | from twisted.web.server import NOT_DONE_YET |
| 11 | |
| 12 | #import twisted.web.server import Site |
| 13 | #from twisted.web.resource import Resource |
| 14 | |
| 15 | import syslog |
| 16 | |
| 17 | clients = { } |
| 18 | |
| 19 | defcfg = ''' |
| 20 | [DEFAULT] |
| 21 | max_batch_down = 65536 |
| 22 | max_queue_time = 10 |
| 23 | max_request_time = 54 |
| 24 | target_requests_outstanding = 3 |
| 25 | ipif = userv root ipif %(local)s,%(peer)s,%(mtu)s,slip %(rnets)s |
| 26 | |
| 27 | [virtual] |
| 28 | mtu = 1500 |
| 29 | # network |
| 30 | # [host] |
| 31 | # [relay] |
| 32 | |
| 33 | [server] |
| 34 | addrs = 127.0.0.1 ::1 |
| 35 | port = 8099 |
| 36 | |
| 37 | [limits] |
| 38 | max_batch_down = 262144 |
| 39 | max_queue_time = 121 |
| 40 | max_request_time = 121 |
| 41 | target_requests_outstanding = 10 |
| 42 | ''' |
| 43 | |
| 44 | #---------- "router" ---------- |
| 45 | |
| 46 | def route(packet, saddr, daddr): |
| 47 | print('TRACE ', saddr, daddr, packet) |
| 48 | try: client = clients[daddr] |
| 49 | except KeyError: dclient = None |
| 50 | if dclient is not None: |
| 51 | dclient.queue_outbound(packet) |
| 52 | elif saddr.is_link_local or daddr.is_link_local: |
| 53 | log_discard(packet, saddr, daddr, 'link-local') |
| 54 | elif daddr == c.host or daddr not in c.network: |
| 55 | print('TRACE INBOUND ', saddr, daddr, packet) |
| 56 | queue_inbound(packet) |
| 57 | elif daddr == relay: |
| 58 | log_discard(packet, saddr, daddr, 'relay') |
| 59 | else: |
| 60 | log_discard(packet, saddr, daddr, 'no client') |
| 61 | |
| 62 | def log_discard(packet, saddr, daddr, why): |
| 63 | print('DROP ', saddr, daddr, why) |
| 64 | # syslog.syslog(syslog.LOG_DEBUG, |
| 65 | # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why)) |
| 66 | |
| 67 | #---------- client ---------- |
| 68 | |
| 69 | class Client(): |
| 70 | def __init__(self, ip, cs): |
| 71 | # instance data members |
| 72 | self._ip = ip |
| 73 | self._cs = cs |
| 74 | self.pw = cfg.get(cs, 'password') |
| 75 | self._rq = collections.deque() # requests |
| 76 | # self._pq = PacketQueue(...) |
| 77 | # plus from config: |
| 78 | # .max_batch_down |
| 79 | # .max_queue_time |
| 80 | # .max_request_time |
| 81 | # .target_requests_outstanding |
| 82 | for k in ('max_batch_down','max_queue_time','max_request_time', |
| 83 | 'target_requests_outstanding'): |
| 84 | req = cfg.getint(cs, k) |
| 85 | limit = cfg.getint('limits',k) |
| 86 | self.__dict__[k] = min(req, limit) |
| 87 | self._pq = PacketQueue(self.max_queue_time) |
| 88 | |
| 89 | def process_arriving_data(self, d): |
| 90 | for packet in slip.decode(d): |
| 91 | (saddr, daddr) = packet_addrs(packet) |
| 92 | if saddr != self._ip: |
| 93 | raise ValueError('wrong source address %s' % saddr) |
| 94 | route(packet, saddr, daddr) |
| 95 | |
| 96 | def _req_cancel(self, request): |
| 97 | request.finish() |
| 98 | |
| 99 | def _req_error(self, err, request): |
| 100 | self._req_cancel(request) |
| 101 | |
| 102 | def queue_outbound(self, packet): |
| 103 | self._pq.append(packet) |
| 104 | |
| 105 | def http_request(self, request): |
| 106 | request.setHeader('Content-Type','application/octet-stream') |
| 107 | reactor.callLater(self.max_request_time, self._req_cancel, request) |
| 108 | request.notifyFinish().addErrback(self._req_error, request) |
| 109 | self._rq.append(request) |
| 110 | self._check_outbound() |
| 111 | |
| 112 | def _check_outbound(self): |
| 113 | while True: |
| 114 | try: request = self._rq[0] |
| 115 | except IndexError: request = None |
| 116 | if request and request.finished: |
| 117 | self._rq.popleft() |
| 118 | continue |
| 119 | |
| 120 | if not self._pq.nonempty(): |
| 121 | # no packets, oh well |
| 122 | continue |
| 123 | |
| 124 | if request is None: |
| 125 | # no request |
| 126 | break |
| 127 | |
| 128 | # request, and also some non-expired packets |
| 129 | while True: |
| 130 | packet = self.pq.popleft() |
| 131 | if packet is None: break |
| 132 | |
| 133 | encoded = slip.encode(packet) |
| 134 | |
| 135 | if request.sentLength > 0: |
| 136 | if (request.sentLength + len(slip.delimiter) |
| 137 | + len(encoded) > self.max_batch_down): |
| 138 | break |
| 139 | request.write(slip.delimiter) |
| 140 | |
| 141 | request.write(encoded) |
| 142 | self._pq.popLeft() |
| 143 | |
| 144 | assert(request.sentLength) |
| 145 | self._rq.popLeft() |
| 146 | request.finish() |
| 147 | # round again, looking for more to do |
| 148 | |
| 149 | while len(self._rq) > self.target_requests_outstanding: |
| 150 | request = self._rq.popleft() |
| 151 | request.finish() |
| 152 | |
| 153 | class IphttpResource(twisted.web.resource.Resource): |
| 154 | isLeaf = True |
| 155 | def render_POST(self, request): |
| 156 | # find client, update config, etc. |
| 157 | ci = ipaddr(request.args['i']) |
| 158 | c = clients[ci] |
| 159 | pw = request.args['pw'] |
| 160 | if pw != c.pw: raise ValueError('bad password') |
| 161 | |
| 162 | # update config |
| 163 | for r, w in (('mbd', 'max_batch_down'), |
| 164 | ('mqt', 'max_queue_time'), |
| 165 | ('mrt', 'max_request_time'), |
| 166 | ('tro', 'target_requests_outstanding')): |
| 167 | try: v = request.args[r] |
| 168 | except KeyError: continue |
| 169 | v = int(v) |
| 170 | c.__dict__[w] = v |
| 171 | |
| 172 | try: d = request.args['d'] |
| 173 | except KeyError: d = '' |
| 174 | |
| 175 | c.process_arriving_data(d) |
| 176 | c.new_request(request) |
| 177 | |
| 178 | def render_GET(self, request): |
| 179 | return b'<html><body>hippotat</body></html>' |
| 180 | |
| 181 | def start_http(): |
| 182 | resource = IphttpResource() |
| 183 | site = twisted.web.server.Site(resource) |
| 184 | for addrspec in cfg.get('server','addrs').split(): |
| 185 | try: |
| 186 | addr = ipaddress.IPv4Address(addrspec) |
| 187 | endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint |
| 188 | except AddressValueError: |
| 189 | addr = ipaddress.IPv6Address(addrspec) |
| 190 | endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint |
| 191 | ep = endpointfactory(reactor, cfg.getint('server','port'), addr) |
| 192 | crash_on_defer(ep.listen(site)) |
| 193 | |
| 194 | #---------- config and setup ---------- |
| 195 | |
| 196 | def process_cfg(): |
| 197 | process_cfg_common_always() |
| 198 | |
| 199 | c.network = ipnetwork(cfg.get('virtual','network')) |
| 200 | if c.network.num_addresses < 3 + 2: |
| 201 | raise ValueError('network needs at least 2^3 addresses') |
| 202 | |
| 203 | try: |
| 204 | c.host = cfg.get('virtual','host') |
| 205 | except NoOptionError: |
| 206 | c.host = next(c.network.hosts()) |
| 207 | |
| 208 | try: |
| 209 | c.relay = cfg.get('virtual','relay') |
| 210 | except NoOptionError: |
| 211 | for search in c.network.hosts(): |
| 212 | if search == c.host: continue |
| 213 | c.relay = search |
| 214 | break |
| 215 | |
| 216 | for cs in cfg.sections(): |
| 217 | if not (':' in cs or '.' in cs): continue |
| 218 | ci = ipaddr(cs) |
| 219 | if ci not in c.network: |
| 220 | raise ValueError('client %s not in network' % ci) |
| 221 | if ci in clients: |
| 222 | raise ValueError('multiple client cfg sections for %s' % ci) |
| 223 | clients[ci] = Client(ci, cs) |
| 224 | |
| 225 | for d, s in (('local', 'host'), |
| 226 | ('peer','relay'), |
| 227 | ('rnets','network')): |
| 228 | try: v = getattr(c, s) |
| 229 | except KeyError: pass |
| 230 | setattr(c, d, v) |
| 231 | |
| 232 | print(repr(c)) |
| 233 | |
| 234 | c.ipif_command = cfg.get('server','ipif', vars=c.__dict__) |
| 235 | |
| 236 | common_startup(defcfg) |
| 237 | process_cfg() |
| 238 | start_ipif(c.ipif_command, route) |
| 239 | start_http() |
| 240 | common_run() |