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) | |
3a6076b4 | 74 | elif saddr.is_link_local or daddr.is_link_local: |
ec0c4d95 | 75 | log_discard(packet, saddr, daddr, 'link-local') |
e2d41dc1 | 76 | elif daddr == host or daddr not in network: |
ec0c4d95 | 77 | print('TRACE INBOUND ', saddr, daddr, packet) |
5da7763e | 78 | queue_inbound(packet) |
e2d41dc1 | 79 | elif daddr == relay: |
5da7763e IJ |
80 | log_discard(packet, saddr, daddr, 'relay') |
81 | else: | |
82 | log_discard(packet, saddr, daddr, 'no client') | |
83 | ||
84 | def log_discard(packet, saddr, daddr, why): | |
3a6076b4 | 85 | print('DROP ', saddr, daddr, why) |
ec0c4d95 IJ |
86 | # syslog.syslog(syslog.LOG_DEBUG, |
87 | # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why)) | |
5da7763e IJ |
88 | |
89 | #---------- ipif (slip subprocess) ---------- | |
90 | ||
5bae5ba3 IJ |
91 | class IpifProcessProtocol(twisted.internet.protocol.ProcessProtocol): |
92 | def __init__(self): | |
93 | self._buffer = b'' | |
94 | def connectionMade(self): pass | |
95 | def outReceived(self, data): | |
ce7f1431 | 96 | #print('RECV ', repr(data)) |
2b95da16 IJ |
97 | self._buffer += data |
98 | packets = slip_decode(self._buffer) | |
99 | self._buffer = packets.pop() | |
5bae5ba3 | 100 | for packet in packets: |
ec0c4d95 | 101 | if not len(packet): continue |
5bae5ba3 | 102 | (saddr, daddr) = packet_addrs(packet) |
ec0c4d95 | 103 | route(packet, saddr, daddr) |
5da7763e IJ |
104 | def processEnded(self, status): |
105 | status.raiseException() | |
5bae5ba3 IJ |
106 | |
107 | def start_ipif(): | |
5da7763e IJ |
108 | global ipif |
109 | ipif = IpifProcessProtocol() | |
110 | reactor.spawnProcess(ipif, | |
ce7f1431 | 111 | '/bin/sh',['sh','-xc', ipif_command], |
5bae5ba3 IJ |
112 | childFDs={0:'w', 1:'r', 2:2}) |
113 | ||
5da7763e IJ |
114 | def queue_inbound(packet): |
115 | ipif.transport.write(slip_delimiter) | |
116 | ipif.transport.write(slip_encode(packet)) | |
117 | ipif.transport.write(slip_delimiter) | |
5bae5ba3 | 118 | |
ce7f1431 IJ |
119 | #---------- SLIP handling ---------- |
120 | ||
121 | slip_end = b'\300' | |
122 | slip_esc = b'\333' | |
123 | slip_esc_end = b'\334' | |
124 | slip_esc_esc = b'\335' | |
125 | slip_delimiter = slip_end | |
126 | ||
127 | def slip_encode(packet): | |
128 | return (packet | |
129 | .replace(slip_esc, slip_esc + slip_esc_esc) | |
130 | .replace(slip_end, slip_esc + slip_esc_end)) | |
131 | ||
132 | def slip_decode(data): | |
133 | print('DECODE ', repr(data)) | |
134 | out = [] | |
135 | for packet in data.split(slip_end): | |
136 | pdata = b'' | |
137 | while True: | |
138 | eix = packet.find(slip_esc) | |
139 | if eix == -1: | |
140 | pdata += packet | |
141 | break | |
142 | #print('ESC ', repr((pdata, packet, eix))) | |
143 | pdata += packet[0 : eix] | |
144 | ck = packet[eix+1] | |
145 | if ck == slip_esc_esc: pdata += slip_esc | |
146 | elif ck == slip_esc_end: pdata += slip_end | |
147 | else: raise ValueError('invalid SLIP escape') | |
148 | packet = packet[eix+2 : ] | |
149 | out.append(pdata) | |
150 | print('DECODED ', repr(out)) | |
151 | return out | |
152 | ||
153 | #---------- packet parsing ---------- | |
154 | ||
155 | def packet_addrs(packet): | |
ec0c4d95 IJ |
156 | version = packet[0] >> 4 |
157 | if version == 4: | |
158 | addrlen = 4 | |
159 | saddroff = 3*4 | |
160 | factory = ipaddress.IPv4Address | |
161 | elif version == 6: | |
162 | addrlen = 16 | |
163 | saddroff = 2*4 | |
164 | factory = ipaddress.IPv6Address | |
165 | else: | |
166 | raise ValueError('unsupported IP version %d' % version) | |
167 | saddr = factory(packet[ saddroff : saddroff + addrlen ]) | |
168 | daddr = factory(packet[ saddroff + addrlen : saddroff + addrlen*2 ]) | |
169 | return (saddr, daddr) | |
ce7f1431 | 170 | |
5da7763e | 171 | #---------- client ---------- |
c4b6d990 | 172 | |
ec88b1f1 | 173 | class Client(): |
c4b6d990 | 174 | def __init__(self, ip, cs): |
ec88b1f1 IJ |
175 | # instance data members |
176 | self._ip = ip | |
177 | self._cs = cs | |
178 | self.pw = cfg.get(cs, 'password') | |
0ac316c8 IJ |
179 | self._rq = collections.deque() # requests |
180 | self._pq = collections.deque() # packets | |
c4b6d990 IJ |
181 | # plus from config: |
182 | # .max_batch_down | |
183 | # .max_queue_time | |
184 | # .max_request_time | |
ec88b1f1 IJ |
185 | for k in ('max_batch_down','max_queue_time','max_request_time'): |
186 | req = cfg.getint(cs, k) | |
094ee3a2 | 187 | limit = cfg.getint('limits',k) |
c4b6d990 IJ |
188 | self.__dict__[k] = min(req, limit) |
189 | ||
190 | def process_arriving_data(self, d): | |
191 | for packet in slip_decode(d): | |
5bae5ba3 | 192 | (saddr, daddr) = packet_addrs(packet) |
c4b6d990 IJ |
193 | if saddr != self._ip: |
194 | raise ValueError('wrong source address %s' % saddr) | |
ec0c4d95 | 195 | route(packet, saddr, daddr) |
ec88b1f1 | 196 | |
c4b6d990 IJ |
197 | def _req_cancel(self, request): |
198 | request.finish() | |
199 | ||
200 | def _req_error(self, err, request): | |
201 | self._req_cancel(request) | |
202 | ||
0ac316c8 | 203 | def queue_outbound(self, packet): |
094ee3a2 | 204 | self._pq.append((time.monotonic(), packet)) |
0ac316c8 | 205 | |
c4b6d990 IJ |
206 | def http_request(self, request): |
207 | request.setHeader('Content-Type','application/octet-stream') | |
208 | reactor.callLater(self.max_request_time, self._req_cancel, request) | |
209 | request.notifyFinish().addErrback(self._req_error, request) | |
0ac316c8 IJ |
210 | self._rq.append(request) |
211 | self._check_outbound() | |
212 | ||
213 | def _check_outbound(self): | |
214 | while True: | |
215 | try: request = self._rq[0] | |
216 | except IndexError: request = None | |
217 | if request and request.finished: | |
218 | self._rq.popleft() | |
219 | continue | |
220 | ||
221 | # now request is an unfinished request, or None | |
222 | try: (queuetime, packet) = self._pq[0] | |
e2d41dc1 | 223 | except IndexError: |
0ac316c8 | 224 | # no packets, oh well |
094ee3a2 IJ |
225 | break |
226 | ||
227 | age = time.monotonic() - queuetime | |
228 | if age > self.max_queue_time: | |
229 | self._pq.popleft() | |
0ac316c8 IJ |
230 | continue |
231 | ||
094ee3a2 IJ |
232 | if request is None: |
233 | # no request | |
234 | break | |
235 | ||
236 | # request, and also some non-expired packets | |
237 | while True: | |
238 | try: (dummy, packet) = self._pq[0] | |
239 | except IndexError: break | |
240 | ||
241 | encoded = slip_encode(packet) | |
242 | ||
243 | if request.sentLength > 0: | |
244 | if (request.sentLength + len(slip_delimiter) | |
245 | + len(encoded) > self.max_batch_down): | |
246 | break | |
247 | request.write(slip_delimiter) | |
248 | ||
249 | request.write(encoded) | |
250 | self._pq.popLeft() | |
251 | ||
252 | assert(request.sentLength) | |
253 | self._rq.popLeft() | |
254 | request.finish() | |
255 | # round again, looking for more to do | |
ec88b1f1 | 256 | |
5da7763e IJ |
257 | class IphttpResource(twisted.web.resource.Resource): |
258 | def render_POST(self, request): | |
259 | # find client, update config, etc. | |
e2d41dc1 | 260 | ci = ipaddr(request.args['i']) |
5da7763e IJ |
261 | c = clients[ci] |
262 | pw = request.args['pw'] | |
263 | if pw != c.pw: raise ValueError('bad password') | |
264 | ||
265 | # update config | |
266 | for r, w in (('mbd', 'max_batch_down'), | |
267 | ('mqt', 'max_queue_time'), | |
268 | ('mrt', 'max_request_time')): | |
269 | try: v = request.args[r] | |
270 | except KeyError: continue | |
271 | v = int(v) | |
272 | c.__dict__[w] = v | |
273 | ||
274 | try: d = request.args['d'] | |
275 | except KeyError: d = '' | |
276 | ||
277 | c.process_arriving_data(d) | |
278 | c.new_request(request) | |
279 | ||
280 | def start_http(): | |
281 | resource = IphttpResource() | |
282 | sitefactory = twisted.web.server.Site(resource) | |
e2d41dc1 | 283 | for addrspec in cfg.get('server','addrs').split(): |
5da7763e IJ |
284 | try: |
285 | addr = ipaddress.IPv4Address(addrspec) | |
286 | endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint | |
287 | except AddressValueError: | |
288 | addr = ipaddress.IPv6Address(addrspec) | |
289 | endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint | |
290 | ep = endpointfactory(reactor, cfg.getint('server','port'), addr) | |
291 | ep.listen(sitefactory) | |
292 | ||
293 | #---------- config and setup ---------- | |
294 | ||
3fba9787 IJ |
295 | def process_cfg(): |
296 | global network | |
e75e9c17 IJ |
297 | global host |
298 | global relay | |
5bae5ba3 | 299 | global ipif_command |
3fba9787 | 300 | |
ec88b1f1 | 301 | network = ipnetwork(cfg.get('virtual','network')) |
e75e9c17 IJ |
302 | if network.num_addresses < 3 + 2: |
303 | raise ValueError('network needs at least 2^3 addresses') | |
304 | ||
3fba9787 | 305 | try: |
e75e9c17 IJ |
306 | host = cfg.get('virtual','host') |
307 | except NoOptionError: | |
e2d41dc1 | 308 | host = next(network.hosts()) |
e75e9c17 IJ |
309 | |
310 | try: | |
311 | relay = cfg.get('virtual','relay') | |
e2d41dc1 | 312 | except NoOptionError: |
e75e9c17 | 313 | for search in network.hosts(): |
e2d41dc1 | 314 | if search == host: continue |
e75e9c17 IJ |
315 | relay = search |
316 | break | |
3fba9787 | 317 | |
ec88b1f1 IJ |
318 | for cs in cfg.sections(): |
319 | if not (':' in cs or '.' in cs): continue | |
e2d41dc1 | 320 | ci = ipaddr(cs) |
ec88b1f1 IJ |
321 | if ci not in network: |
322 | raise ValueError('client %s not in network' % ci) | |
323 | if ci in clients: | |
324 | raise ValueError('multiple client cfg sections for %s' % ci) | |
325 | clients[ci] = Client(ci, cs) | |
3fba9787 | 326 | |
e2d41dc1 IJ |
327 | global mtu |
328 | mtu = cfg.get('virtual','mtu') | |
329 | ||
5bae5ba3 IJ |
330 | iic_vars = { } |
331 | for k in ('host','relay','mtu','network'): | |
332 | iic_vars[k] = globals()[k] | |
333 | ||
334 | ipif_command = cfg.get('server','ipif', vars=iic_vars) | |
335 | ||
e2d41dc1 IJ |
336 | def crash_on_critical(event): |
337 | if event.get('log_level') >= LogLevel.critical: | |
338 | print('crashing: ', twisted.logger.formatEvent(event), file=sys.stderr) | |
339 | #print('crashing!', file=sys.stderr) | |
340 | #os._exit(1) | |
341 | try: reactor.stop() | |
342 | except twisted.internet.error.ReactorNotRunning: pass | |
343 | ||
e75e9c17 | 344 | def startup(): |
e2d41dc1 IJ |
345 | global cfg |
346 | ||
e75e9c17 IJ |
347 | op = OptionParser() |
348 | op.add_option('-c', '--config', dest='configfile', | |
349 | default='/etc/hippottd/server.conf') | |
350 | global opts | |
351 | (opts, args) = op.parse_args() | |
352 | if len(args): op.error('no non-option arguments please') | |
353 | ||
e2d41dc1 IJ |
354 | twisted.logger.globalLogPublisher.addObserver(crash_on_critical) |
355 | ||
e75e9c17 | 356 | cfg = ConfigParser() |
5bae5ba3 | 357 | cfg.read_string(defcfg) |
e2d41dc1 | 358 | cfg.read(opts.configfile) |
5bae5ba3 IJ |
359 | process_cfg() |
360 | ||
361 | start_ipif() | |
362 | start_http() | |
e2d41dc1 IJ |
363 | |
364 | startup() | |
365 | reactor.run() |