Commit | Line | Data |
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094ee3a2 | 1 | #!/usr/bin/python3 |
3fba9787 | 2 | |
aa663282 IJ |
3 | import signal |
4 | signal.signal(signal.SIGINT, signal.SIG_DFL) | |
5 | ||
e2d41dc1 IJ |
6 | import sys |
7 | import os | |
8 | ||
5bae5ba3 | 9 | import twisted |
e2d41dc1 IJ |
10 | import twisted.internet |
11 | import twisted.internet.endpoints | |
12 | from twisted.internet import reactor | |
13 | from twisted.web.server import NOT_DONE_YET | |
14 | from twisted.logger import LogLevel | |
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 | ||
b0cfbfce | 27 | from hippotit import * |
3fba9787 | 28 | |
b0cfbfce | 29 | clients = { } |
3fba9787 | 30 | |
e75e9c17 | 31 | defcfg = ''' |
094ee3a2 IJ |
32 | [DEFAULT] |
33 | max_batch_down = 65536 | |
34 | max_queue_time = 10 | |
35 | max_request_time = 54 | |
36 | ||
e75e9c17 IJ |
37 | [virtual] |
38 | mtu = 1500 | |
39 | # network | |
40 | # [host] | |
41 | # [relay] | |
42 | ||
43 | [server] | |
e2d41dc1 | 44 | ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s |
5da7763e | 45 | addrs = 127.0.0.1 ::1 |
aa663282 | 46 | port = 8099 |
e75e9c17 | 47 | |
094ee3a2 IJ |
48 | [limits] |
49 | max_batch_down = 262144 | |
50 | max_queue_time = 121 | |
51 | max_request_time = 121 | |
ec88b1f1 IJ |
52 | ''' |
53 | ||
aa663282 IJ |
54 | #---------- error handling ---------- |
55 | ||
56 | def crash(err): | |
57 | print('CRASH ', err, file=sys.stderr) | |
58 | try: reactor.stop() | |
59 | except twisted.internet.error.ReactorNotRunning: pass | |
60 | ||
61 | def crash_on_defer(defer): | |
62 | defer.addErrback(lambda err: crash(err)) | |
63 | ||
64 | def crash_on_critical(event): | |
65 | if event.get('log_level') >= LogLevel.critical: | |
66 | crash(twisted.logger.formatEvent(event)) | |
67 | ||
5da7763e IJ |
68 | #---------- "router" ---------- |
69 | ||
ec0c4d95 IJ |
70 | def route(packet, saddr, daddr): |
71 | print('TRACE ', saddr, daddr, packet) | |
5da7763e IJ |
72 | try: client = clients[daddr] |
73 | except KeyError: dclient = None | |
74 | if dclient is not None: | |
75 | dclient.queue_outbound(packet) | |
3a6076b4 | 76 | elif saddr.is_link_local or daddr.is_link_local: |
ec0c4d95 | 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): | |
3a6076b4 | 87 | print('DROP ', saddr, daddr, why) |
ec0c4d95 IJ |
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 | 99 | self._buffer += data |
b0cfbfce | 100 | packets = slip.decode(self._buffer) |
2b95da16 | 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 | 116 | def queue_inbound(packet): |
b0cfbfce IJ |
117 | ipif.transport.write(slip.delimiter) |
118 | ipif.transport.write(slip.encode(packet)) | |
119 | ipif.transport.write(slip.delimiter) | |
ce7f1431 | 120 | |
5da7763e | 121 | #---------- client ---------- |
c4b6d990 | 122 | |
ec88b1f1 | 123 | class Client(): |
c4b6d990 | 124 | def __init__(self, ip, cs): |
ec88b1f1 IJ |
125 | # instance data members |
126 | self._ip = ip | |
127 | self._cs = cs | |
128 | self.pw = cfg.get(cs, 'password') | |
0ac316c8 IJ |
129 | self._rq = collections.deque() # requests |
130 | self._pq = collections.deque() # packets | |
c4b6d990 IJ |
131 | # plus from config: |
132 | # .max_batch_down | |
133 | # .max_queue_time | |
134 | # .max_request_time | |
ec88b1f1 IJ |
135 | for k in ('max_batch_down','max_queue_time','max_request_time'): |
136 | req = cfg.getint(cs, k) | |
094ee3a2 | 137 | limit = cfg.getint('limits',k) |
c4b6d990 IJ |
138 | self.__dict__[k] = min(req, limit) |
139 | ||
140 | def process_arriving_data(self, d): | |
b0cfbfce | 141 | for packet in slip.decode(d): |
5bae5ba3 | 142 | (saddr, daddr) = packet_addrs(packet) |
c4b6d990 IJ |
143 | if saddr != self._ip: |
144 | raise ValueError('wrong source address %s' % saddr) | |
ec0c4d95 | 145 | route(packet, saddr, daddr) |
ec88b1f1 | 146 | |
c4b6d990 IJ |
147 | def _req_cancel(self, request): |
148 | request.finish() | |
149 | ||
150 | def _req_error(self, err, request): | |
151 | self._req_cancel(request) | |
152 | ||
0ac316c8 | 153 | def queue_outbound(self, packet): |
094ee3a2 | 154 | self._pq.append((time.monotonic(), packet)) |
0ac316c8 | 155 | |
c4b6d990 IJ |
156 | def http_request(self, request): |
157 | request.setHeader('Content-Type','application/octet-stream') | |
158 | reactor.callLater(self.max_request_time, self._req_cancel, request) | |
159 | request.notifyFinish().addErrback(self._req_error, request) | |
0ac316c8 IJ |
160 | self._rq.append(request) |
161 | self._check_outbound() | |
162 | ||
163 | def _check_outbound(self): | |
164 | while True: | |
165 | try: request = self._rq[0] | |
166 | except IndexError: request = None | |
167 | if request and request.finished: | |
168 | self._rq.popleft() | |
169 | continue | |
170 | ||
171 | # now request is an unfinished request, or None | |
172 | try: (queuetime, packet) = self._pq[0] | |
e2d41dc1 | 173 | except IndexError: |
0ac316c8 | 174 | # no packets, oh well |
094ee3a2 IJ |
175 | break |
176 | ||
177 | age = time.monotonic() - queuetime | |
178 | if age > self.max_queue_time: | |
179 | self._pq.popleft() | |
0ac316c8 IJ |
180 | continue |
181 | ||
094ee3a2 IJ |
182 | if request is None: |
183 | # no request | |
184 | break | |
185 | ||
186 | # request, and also some non-expired packets | |
187 | while True: | |
188 | try: (dummy, packet) = self._pq[0] | |
189 | except IndexError: break | |
190 | ||
b0cfbfce | 191 | encoded = slip.encode(packet) |
094ee3a2 IJ |
192 | |
193 | if request.sentLength > 0: | |
b0cfbfce | 194 | if (request.sentLength + len(slip.delimiter) |
094ee3a2 IJ |
195 | + len(encoded) > self.max_batch_down): |
196 | break | |
b0cfbfce | 197 | request.write(slip.delimiter) |
094ee3a2 IJ |
198 | |
199 | request.write(encoded) | |
200 | self._pq.popLeft() | |
201 | ||
202 | assert(request.sentLength) | |
203 | self._rq.popLeft() | |
204 | request.finish() | |
205 | # round again, looking for more to do | |
ec88b1f1 | 206 | |
5da7763e | 207 | class IphttpResource(twisted.web.resource.Resource): |
c1e4910b | 208 | isLeaf = True |
5da7763e IJ |
209 | def render_POST(self, request): |
210 | # find client, update config, etc. | |
e2d41dc1 | 211 | ci = ipaddr(request.args['i']) |
5da7763e IJ |
212 | c = clients[ci] |
213 | pw = request.args['pw'] | |
214 | if pw != c.pw: raise ValueError('bad password') | |
215 | ||
216 | # update config | |
217 | for r, w in (('mbd', 'max_batch_down'), | |
218 | ('mqt', 'max_queue_time'), | |
219 | ('mrt', 'max_request_time')): | |
220 | try: v = request.args[r] | |
221 | except KeyError: continue | |
222 | v = int(v) | |
223 | c.__dict__[w] = v | |
224 | ||
225 | try: d = request.args['d'] | |
226 | except KeyError: d = '' | |
227 | ||
228 | c.process_arriving_data(d) | |
229 | c.new_request(request) | |
230 | ||
8e279651 | 231 | def render_GET(self, request): |
b11c6e7a | 232 | return b'<html><body>hippotit</body></html>' |
8e279651 | 233 | |
5da7763e IJ |
234 | def start_http(): |
235 | resource = IphttpResource() | |
b11c6e7a | 236 | site = twisted.web.server.Site(resource) |
e2d41dc1 | 237 | for addrspec in cfg.get('server','addrs').split(): |
5da7763e IJ |
238 | try: |
239 | addr = ipaddress.IPv4Address(addrspec) | |
240 | endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint | |
241 | except AddressValueError: | |
242 | addr = ipaddress.IPv6Address(addrspec) | |
243 | endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint | |
244 | ep = endpointfactory(reactor, cfg.getint('server','port'), addr) | |
b11c6e7a | 245 | crash_on_defer(ep.listen(site)) |
5da7763e IJ |
246 | |
247 | #---------- config and setup ---------- | |
248 | ||
3fba9787 IJ |
249 | def process_cfg(): |
250 | global network | |
e75e9c17 IJ |
251 | global host |
252 | global relay | |
5bae5ba3 | 253 | global ipif_command |
3fba9787 | 254 | |
ec88b1f1 | 255 | network = ipnetwork(cfg.get('virtual','network')) |
e75e9c17 IJ |
256 | if network.num_addresses < 3 + 2: |
257 | raise ValueError('network needs at least 2^3 addresses') | |
258 | ||
3fba9787 | 259 | try: |
e75e9c17 IJ |
260 | host = cfg.get('virtual','host') |
261 | except NoOptionError: | |
e2d41dc1 | 262 | host = next(network.hosts()) |
e75e9c17 IJ |
263 | |
264 | try: | |
265 | relay = cfg.get('virtual','relay') | |
e2d41dc1 | 266 | except NoOptionError: |
e75e9c17 | 267 | for search in network.hosts(): |
e2d41dc1 | 268 | if search == host: continue |
e75e9c17 IJ |
269 | relay = search |
270 | break | |
3fba9787 | 271 | |
ec88b1f1 IJ |
272 | for cs in cfg.sections(): |
273 | if not (':' in cs or '.' in cs): continue | |
e2d41dc1 | 274 | ci = ipaddr(cs) |
ec88b1f1 IJ |
275 | if ci not in network: |
276 | raise ValueError('client %s not in network' % ci) | |
277 | if ci in clients: | |
278 | raise ValueError('multiple client cfg sections for %s' % ci) | |
279 | clients[ci] = Client(ci, cs) | |
3fba9787 | 280 | |
e2d41dc1 IJ |
281 | global mtu |
282 | mtu = cfg.get('virtual','mtu') | |
283 | ||
5bae5ba3 IJ |
284 | iic_vars = { } |
285 | for k in ('host','relay','mtu','network'): | |
286 | iic_vars[k] = globals()[k] | |
287 | ||
288 | ipif_command = cfg.get('server','ipif', vars=iic_vars) | |
289 | ||
e75e9c17 | 290 | def startup(): |
e2d41dc1 IJ |
291 | global cfg |
292 | ||
e75e9c17 IJ |
293 | op = OptionParser() |
294 | op.add_option('-c', '--config', dest='configfile', | |
295 | default='/etc/hippottd/server.conf') | |
296 | global opts | |
297 | (opts, args) = op.parse_args() | |
298 | if len(args): op.error('no non-option arguments please') | |
299 | ||
e2d41dc1 IJ |
300 | twisted.logger.globalLogPublisher.addObserver(crash_on_critical) |
301 | ||
e75e9c17 | 302 | cfg = ConfigParser() |
5bae5ba3 | 303 | cfg.read_string(defcfg) |
e2d41dc1 | 304 | cfg.read(opts.configfile) |
5bae5ba3 IJ |
305 | process_cfg() |
306 | ||
307 | start_ipif() | |
308 | start_http() | |
e2d41dc1 IJ |
309 | |
310 | startup() | |
311 | reactor.run() | |
aa663282 | 312 | print('CRASHED (end)', file=sys.stderr) |