Commit | Line | Data |
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094ee3a2 | 1 | #!/usr/bin/python3 |
3fba9787 | 2 | |
e2d41dc1 IJ |
3 | import sys |
4 | import os | |
5 | ||
5bae5ba3 | 6 | import twisted |
e2d41dc1 IJ |
7 | import twisted.internet |
8 | import twisted.internet.endpoints | |
9 | from twisted.internet import reactor | |
10 | from twisted.web.server import NOT_DONE_YET | |
11 | from twisted.logger import LogLevel | |
12 | ||
13 | import ipaddress | |
14 | from ipaddress import AddressValueError | |
5bae5ba3 | 15 | |
5da7763e IJ |
16 | #import twisted.web.server import Site |
17 | #from twisted.web.resource import Resource | |
3fba9787 | 18 | |
e75e9c17 IJ |
19 | from optparse import OptionParser |
20 | from configparser import ConfigParser | |
21 | from configparser import NoOptionError | |
3fba9787 | 22 | |
0ac316c8 IJ |
23 | import collections |
24 | ||
c4b6d990 IJ |
25 | import syslog |
26 | ||
3fba9787 IJ |
27 | clients = { } |
28 | ||
e2d41dc1 | 29 | def ipaddr(input): |
3fba9787 | 30 | try: |
ec88b1f1 | 31 | r = ipaddress.IPv4Address(input) |
3fba9787 | 32 | except AddressValueError: |
ec88b1f1 | 33 | r = ipaddress.IPv6Address(input) |
3fba9787 IJ |
34 | return r |
35 | ||
36 | def ipnetwork(input): | |
37 | try: | |
ec88b1f1 | 38 | r = ipaddress.IPv4Network(input) |
3fba9787 | 39 | except NetworkValueError: |
ec88b1f1 | 40 | r = ipaddress.IPv6Network(input) |
3fba9787 IJ |
41 | return r |
42 | ||
e75e9c17 | 43 | defcfg = ''' |
094ee3a2 IJ |
44 | [DEFAULT] |
45 | max_batch_down = 65536 | |
46 | max_queue_time = 10 | |
47 | max_request_time = 54 | |
48 | ||
e75e9c17 IJ |
49 | [virtual] |
50 | mtu = 1500 | |
51 | # network | |
52 | # [host] | |
53 | # [relay] | |
54 | ||
55 | [server] | |
e2d41dc1 | 56 | ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s |
5da7763e IJ |
57 | addrs = 127.0.0.1 ::1 |
58 | port = 80 | |
e75e9c17 | 59 | |
094ee3a2 IJ |
60 | [limits] |
61 | max_batch_down = 262144 | |
62 | max_queue_time = 121 | |
63 | max_request_time = 121 | |
ec88b1f1 IJ |
64 | ''' |
65 | ||
5da7763e IJ |
66 | #---------- "router" ---------- |
67 | ||
ec0c4d95 IJ |
68 | def route(packet, saddr, daddr): |
69 | print('TRACE ', saddr, daddr, packet) | |
5da7763e IJ |
70 | try: client = clients[daddr] |
71 | except KeyError: dclient = None | |
72 | if dclient is not None: | |
73 | dclient.queue_outbound(packet) | |
ec0c4d95 IJ |
74 | elif daddr.is_multicast: |
75 | log_discard(packet, saddr, daddr, 'multicast') | |
76 | elif daddr.is_link_local: | |
77 | log_discard(packet, saddr, daddr, 'link-local') | |
e2d41dc1 | 78 | elif daddr == host or daddr not in network: |
ec0c4d95 | 79 | print('TRACE INBOUND ', saddr, daddr, packet) |
5da7763e | 80 | queue_inbound(packet) |
e2d41dc1 | 81 | elif daddr == relay: |
5da7763e IJ |
82 | log_discard(packet, saddr, daddr, 'relay') |
83 | else: | |
84 | log_discard(packet, saddr, daddr, 'no client') | |
85 | ||
86 | def log_discard(packet, saddr, daddr, why): | |
ec0c4d95 IJ |
87 | print('DROP ', saddr, daddr, why, packet) |
88 | # syslog.syslog(syslog.LOG_DEBUG, | |
89 | # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why)) | |
5da7763e IJ |
90 | |
91 | #---------- ipif (slip subprocess) ---------- | |
92 | ||
5bae5ba3 IJ |
93 | class IpifProcessProtocol(twisted.internet.protocol.ProcessProtocol): |
94 | def __init__(self): | |
95 | self._buffer = b'' | |
96 | def connectionMade(self): pass | |
97 | def outReceived(self, data): | |
ce7f1431 | 98 | #print('RECV ', repr(data)) |
2b95da16 IJ |
99 | self._buffer += data |
100 | packets = slip_decode(self._buffer) | |
101 | self._buffer = packets.pop() | |
5bae5ba3 | 102 | for packet in packets: |
ec0c4d95 | 103 | if not len(packet): continue |
5bae5ba3 | 104 | (saddr, daddr) = packet_addrs(packet) |
ec0c4d95 | 105 | route(packet, saddr, daddr) |
5da7763e IJ |
106 | def processEnded(self, status): |
107 | status.raiseException() | |
5bae5ba3 IJ |
108 | |
109 | def start_ipif(): | |
5da7763e IJ |
110 | global ipif |
111 | ipif = IpifProcessProtocol() | |
112 | reactor.spawnProcess(ipif, | |
ce7f1431 | 113 | '/bin/sh',['sh','-xc', ipif_command], |
5bae5ba3 IJ |
114 | childFDs={0:'w', 1:'r', 2:2}) |
115 | ||
5da7763e IJ |
116 | def queue_inbound(packet): |
117 | ipif.transport.write(slip_delimiter) | |
118 | ipif.transport.write(slip_encode(packet)) | |
119 | ipif.transport.write(slip_delimiter) | |
5bae5ba3 | 120 | |
ce7f1431 IJ |
121 | #---------- SLIP handling ---------- |
122 | ||
123 | slip_end = b'\300' | |
124 | slip_esc = b'\333' | |
125 | slip_esc_end = b'\334' | |
126 | slip_esc_esc = b'\335' | |
127 | slip_delimiter = slip_end | |
128 | ||
129 | def slip_encode(packet): | |
130 | return (packet | |
131 | .replace(slip_esc, slip_esc + slip_esc_esc) | |
132 | .replace(slip_end, slip_esc + slip_esc_end)) | |
133 | ||
134 | def slip_decode(data): | |
135 | print('DECODE ', repr(data)) | |
136 | out = [] | |
137 | for packet in data.split(slip_end): | |
138 | pdata = b'' | |
139 | while True: | |
140 | eix = packet.find(slip_esc) | |
141 | if eix == -1: | |
142 | pdata += packet | |
143 | break | |
144 | #print('ESC ', repr((pdata, packet, eix))) | |
145 | pdata += packet[0 : eix] | |
146 | ck = packet[eix+1] | |
147 | if ck == slip_esc_esc: pdata += slip_esc | |
148 | elif ck == slip_esc_end: pdata += slip_end | |
149 | else: raise ValueError('invalid SLIP escape') | |
150 | packet = packet[eix+2 : ] | |
151 | out.append(pdata) | |
152 | print('DECODED ', repr(out)) | |
153 | return out | |
154 | ||
155 | #---------- packet parsing ---------- | |
156 | ||
157 | def packet_addrs(packet): | |
ec0c4d95 IJ |
158 | version = packet[0] >> 4 |
159 | if version == 4: | |
160 | addrlen = 4 | |
161 | saddroff = 3*4 | |
162 | factory = ipaddress.IPv4Address | |
163 | elif version == 6: | |
164 | addrlen = 16 | |
165 | saddroff = 2*4 | |
166 | factory = ipaddress.IPv6Address | |
167 | else: | |
168 | raise ValueError('unsupported IP version %d' % version) | |
169 | saddr = factory(packet[ saddroff : saddroff + addrlen ]) | |
170 | daddr = factory(packet[ saddroff + addrlen : saddroff + addrlen*2 ]) | |
171 | return (saddr, daddr) | |
ce7f1431 | 172 | |
5da7763e | 173 | #---------- client ---------- |
c4b6d990 | 174 | |
ec88b1f1 | 175 | class Client(): |
c4b6d990 | 176 | def __init__(self, ip, cs): |
ec88b1f1 IJ |
177 | # instance data members |
178 | self._ip = ip | |
179 | self._cs = cs | |
180 | self.pw = cfg.get(cs, 'password') | |
0ac316c8 IJ |
181 | self._rq = collections.deque() # requests |
182 | self._pq = collections.deque() # packets | |
c4b6d990 IJ |
183 | # plus from config: |
184 | # .max_batch_down | |
185 | # .max_queue_time | |
186 | # .max_request_time | |
ec88b1f1 IJ |
187 | for k in ('max_batch_down','max_queue_time','max_request_time'): |
188 | req = cfg.getint(cs, k) | |
094ee3a2 | 189 | limit = cfg.getint('limits',k) |
c4b6d990 IJ |
190 | self.__dict__[k] = min(req, limit) |
191 | ||
192 | def process_arriving_data(self, d): | |
193 | for packet in slip_decode(d): | |
5bae5ba3 | 194 | (saddr, daddr) = packet_addrs(packet) |
c4b6d990 IJ |
195 | if saddr != self._ip: |
196 | raise ValueError('wrong source address %s' % saddr) | |
ec0c4d95 | 197 | route(packet, saddr, daddr) |
ec88b1f1 | 198 | |
c4b6d990 IJ |
199 | def _req_cancel(self, request): |
200 | request.finish() | |
201 | ||
202 | def _req_error(self, err, request): | |
203 | self._req_cancel(request) | |
204 | ||
0ac316c8 | 205 | def queue_outbound(self, packet): |
094ee3a2 | 206 | self._pq.append((time.monotonic(), packet)) |
0ac316c8 | 207 | |
c4b6d990 IJ |
208 | def http_request(self, request): |
209 | request.setHeader('Content-Type','application/octet-stream') | |
210 | reactor.callLater(self.max_request_time, self._req_cancel, request) | |
211 | request.notifyFinish().addErrback(self._req_error, request) | |
0ac316c8 IJ |
212 | self._rq.append(request) |
213 | self._check_outbound() | |
214 | ||
215 | def _check_outbound(self): | |
216 | while True: | |
217 | try: request = self._rq[0] | |
218 | except IndexError: request = None | |
219 | if request and request.finished: | |
220 | self._rq.popleft() | |
221 | continue | |
222 | ||
223 | # now request is an unfinished request, or None | |
224 | try: (queuetime, packet) = self._pq[0] | |
e2d41dc1 | 225 | except IndexError: |
0ac316c8 | 226 | # no packets, oh well |
094ee3a2 IJ |
227 | break |
228 | ||
229 | age = time.monotonic() - queuetime | |
230 | if age > self.max_queue_time: | |
231 | self._pq.popleft() | |
0ac316c8 IJ |
232 | continue |
233 | ||
094ee3a2 IJ |
234 | if request is None: |
235 | # no request | |
236 | break | |
237 | ||
238 | # request, and also some non-expired packets | |
239 | while True: | |
240 | try: (dummy, packet) = self._pq[0] | |
241 | except IndexError: break | |
242 | ||
243 | encoded = slip_encode(packet) | |
244 | ||
245 | if request.sentLength > 0: | |
246 | if (request.sentLength + len(slip_delimiter) | |
247 | + len(encoded) > self.max_batch_down): | |
248 | break | |
249 | request.write(slip_delimiter) | |
250 | ||
251 | request.write(encoded) | |
252 | self._pq.popLeft() | |
253 | ||
254 | assert(request.sentLength) | |
255 | self._rq.popLeft() | |
256 | request.finish() | |
257 | # round again, looking for more to do | |
ec88b1f1 | 258 | |
5da7763e IJ |
259 | class IphttpResource(twisted.web.resource.Resource): |
260 | def render_POST(self, request): | |
261 | # find client, update config, etc. | |
e2d41dc1 | 262 | ci = ipaddr(request.args['i']) |
5da7763e IJ |
263 | c = clients[ci] |
264 | pw = request.args['pw'] | |
265 | if pw != c.pw: raise ValueError('bad password') | |
266 | ||
267 | # update config | |
268 | for r, w in (('mbd', 'max_batch_down'), | |
269 | ('mqt', 'max_queue_time'), | |
270 | ('mrt', 'max_request_time')): | |
271 | try: v = request.args[r] | |
272 | except KeyError: continue | |
273 | v = int(v) | |
274 | c.__dict__[w] = v | |
275 | ||
276 | try: d = request.args['d'] | |
277 | except KeyError: d = '' | |
278 | ||
279 | c.process_arriving_data(d) | |
280 | c.new_request(request) | |
281 | ||
282 | def start_http(): | |
283 | resource = IphttpResource() | |
284 | sitefactory = twisted.web.server.Site(resource) | |
e2d41dc1 | 285 | for addrspec in cfg.get('server','addrs').split(): |
5da7763e IJ |
286 | try: |
287 | addr = ipaddress.IPv4Address(addrspec) | |
288 | endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint | |
289 | except AddressValueError: | |
290 | addr = ipaddress.IPv6Address(addrspec) | |
291 | endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint | |
292 | ep = endpointfactory(reactor, cfg.getint('server','port'), addr) | |
293 | ep.listen(sitefactory) | |
294 | ||
295 | #---------- config and setup ---------- | |
296 | ||
3fba9787 IJ |
297 | def process_cfg(): |
298 | global network | |
e75e9c17 IJ |
299 | global host |
300 | global relay | |
5bae5ba3 | 301 | global ipif_command |
3fba9787 | 302 | |
ec88b1f1 | 303 | network = ipnetwork(cfg.get('virtual','network')) |
e75e9c17 IJ |
304 | if network.num_addresses < 3 + 2: |
305 | raise ValueError('network needs at least 2^3 addresses') | |
306 | ||
3fba9787 | 307 | try: |
e75e9c17 IJ |
308 | host = cfg.get('virtual','host') |
309 | except NoOptionError: | |
e2d41dc1 | 310 | host = next(network.hosts()) |
e75e9c17 IJ |
311 | |
312 | try: | |
313 | relay = cfg.get('virtual','relay') | |
e2d41dc1 | 314 | except NoOptionError: |
e75e9c17 | 315 | for search in network.hosts(): |
e2d41dc1 | 316 | if search == host: continue |
e75e9c17 IJ |
317 | relay = search |
318 | break | |
3fba9787 | 319 | |
ec88b1f1 IJ |
320 | for cs in cfg.sections(): |
321 | if not (':' in cs or '.' in cs): continue | |
e2d41dc1 | 322 | ci = ipaddr(cs) |
ec88b1f1 IJ |
323 | if ci not in network: |
324 | raise ValueError('client %s not in network' % ci) | |
325 | if ci in clients: | |
326 | raise ValueError('multiple client cfg sections for %s' % ci) | |
327 | clients[ci] = Client(ci, cs) | |
3fba9787 | 328 | |
e2d41dc1 IJ |
329 | global mtu |
330 | mtu = cfg.get('virtual','mtu') | |
331 | ||
5bae5ba3 IJ |
332 | iic_vars = { } |
333 | for k in ('host','relay','mtu','network'): | |
334 | iic_vars[k] = globals()[k] | |
335 | ||
336 | ipif_command = cfg.get('server','ipif', vars=iic_vars) | |
337 | ||
e2d41dc1 IJ |
338 | def crash_on_critical(event): |
339 | if event.get('log_level') >= LogLevel.critical: | |
340 | print('crashing: ', twisted.logger.formatEvent(event), file=sys.stderr) | |
341 | #print('crashing!', file=sys.stderr) | |
342 | #os._exit(1) | |
343 | try: reactor.stop() | |
344 | except twisted.internet.error.ReactorNotRunning: pass | |
345 | ||
e75e9c17 | 346 | def startup(): |
e2d41dc1 IJ |
347 | global cfg |
348 | ||
e75e9c17 IJ |
349 | op = OptionParser() |
350 | op.add_option('-c', '--config', dest='configfile', | |
351 | default='/etc/hippottd/server.conf') | |
352 | global opts | |
353 | (opts, args) = op.parse_args() | |
354 | if len(args): op.error('no non-option arguments please') | |
355 | ||
e2d41dc1 IJ |
356 | twisted.logger.globalLogPublisher.addObserver(crash_on_critical) |
357 | ||
e75e9c17 | 358 | cfg = ConfigParser() |
5bae5ba3 | 359 | cfg.read_string(defcfg) |
e2d41dc1 | 360 | cfg.read(opts.configfile) |
5bae5ba3 IJ |
361 | process_cfg() |
362 | ||
363 | start_ipif() | |
364 | start_http() | |
e2d41dc1 IJ |
365 | |
366 | startup() | |
367 | reactor.run() |