Commit | Line | Data |
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094ee3a2 | 1 | #!/usr/bin/python3 |
3fba9787 | 2 | |
37ab4cdc | 3 | from hippotat import * |
aa663282 | 4 | |
e2d41dc1 IJ |
5 | import sys |
6 | import os | |
7 | ||
e2d41dc1 IJ |
8 | import twisted.internet |
9 | import twisted.internet.endpoints | |
e2d41dc1 IJ |
10 | from twisted.web.server import NOT_DONE_YET |
11 | from twisted.logger import LogLevel | |
12 | ||
5da7763e IJ |
13 | #import twisted.web.server import Site |
14 | #from twisted.web.resource import Resource | |
3fba9787 | 15 | |
e75e9c17 IJ |
16 | from optparse import OptionParser |
17 | from configparser import ConfigParser | |
18 | from configparser import NoOptionError | |
3fba9787 | 19 | |
0ac316c8 IJ |
20 | import collections |
21 | ||
c4b6d990 IJ |
22 | import syslog |
23 | ||
b0cfbfce | 24 | clients = { } |
3fba9787 | 25 | |
e75e9c17 | 26 | defcfg = ''' |
094ee3a2 IJ |
27 | [DEFAULT] |
28 | max_batch_down = 65536 | |
29 | max_queue_time = 10 | |
30 | max_request_time = 54 | |
650a3251 | 31 | target_requests_outstanding = 3 |
094ee3a2 | 32 | |
e75e9c17 IJ |
33 | [virtual] |
34 | mtu = 1500 | |
35 | # network | |
36 | # [host] | |
37 | # [relay] | |
38 | ||
39 | [server] | |
e2d41dc1 | 40 | ipif = userv root ipif %(host)s,%(relay)s,%(mtu)s,slip %(network)s |
5da7763e | 41 | addrs = 127.0.0.1 ::1 |
aa663282 | 42 | port = 8099 |
e75e9c17 | 43 | |
094ee3a2 IJ |
44 | [limits] |
45 | max_batch_down = 262144 | |
46 | max_queue_time = 121 | |
47 | max_request_time = 121 | |
650a3251 | 48 | target_requests_outstanding = 10 |
ec88b1f1 IJ |
49 | ''' |
50 | ||
aa663282 IJ |
51 | #---------- error handling ---------- |
52 | ||
53 | def crash(err): | |
54 | print('CRASH ', err, file=sys.stderr) | |
55 | try: reactor.stop() | |
56 | except twisted.internet.error.ReactorNotRunning: pass | |
57 | ||
58 | def crash_on_defer(defer): | |
59 | defer.addErrback(lambda err: crash(err)) | |
60 | ||
61 | def crash_on_critical(event): | |
62 | if event.get('log_level') >= LogLevel.critical: | |
63 | crash(twisted.logger.formatEvent(event)) | |
64 | ||
5da7763e IJ |
65 | #---------- "router" ---------- |
66 | ||
ec0c4d95 IJ |
67 | def route(packet, saddr, daddr): |
68 | print('TRACE ', saddr, daddr, packet) | |
5da7763e IJ |
69 | try: client = clients[daddr] |
70 | except KeyError: dclient = None | |
71 | if dclient is not None: | |
72 | dclient.queue_outbound(packet) | |
3a6076b4 | 73 | elif saddr.is_link_local or daddr.is_link_local: |
ec0c4d95 | 74 | log_discard(packet, saddr, daddr, 'link-local') |
e2d41dc1 | 75 | elif daddr == host or daddr not in network: |
ec0c4d95 | 76 | print('TRACE INBOUND ', saddr, daddr, packet) |
5da7763e | 77 | queue_inbound(packet) |
e2d41dc1 | 78 | elif daddr == relay: |
5da7763e IJ |
79 | log_discard(packet, saddr, daddr, 'relay') |
80 | else: | |
81 | log_discard(packet, saddr, daddr, 'no client') | |
82 | ||
83 | def log_discard(packet, saddr, daddr, why): | |
3a6076b4 | 84 | print('DROP ', saddr, daddr, why) |
ec0c4d95 IJ |
85 | # syslog.syslog(syslog.LOG_DEBUG, |
86 | # 'discarded packet %s -> %s (%s)' % (saddr, daddr, why)) | |
5da7763e | 87 | |
5da7763e | 88 | #---------- client ---------- |
c4b6d990 | 89 | |
ec88b1f1 | 90 | class Client(): |
c4b6d990 | 91 | def __init__(self, ip, cs): |
ec88b1f1 IJ |
92 | # instance data members |
93 | self._ip = ip | |
94 | self._cs = cs | |
95 | self.pw = cfg.get(cs, 'password') | |
0ac316c8 | 96 | self._rq = collections.deque() # requests |
650a3251 | 97 | # self._pq = PacketQueue(...) |
c4b6d990 IJ |
98 | # plus from config: |
99 | # .max_batch_down | |
100 | # .max_queue_time | |
101 | # .max_request_time | |
650a3251 IJ |
102 | # .target_requests_outstanding |
103 | for k in ('max_batch_down','max_queue_time','max_request_time', | |
104 | 'target_requests_outstanding'): | |
ec88b1f1 | 105 | req = cfg.getint(cs, k) |
094ee3a2 | 106 | limit = cfg.getint('limits',k) |
c4b6d990 | 107 | self.__dict__[k] = min(req, limit) |
650a3251 | 108 | self._pq = PacketQueue(self.max_queue_time) |
c4b6d990 IJ |
109 | |
110 | def process_arriving_data(self, d): | |
b0cfbfce | 111 | for packet in slip.decode(d): |
5bae5ba3 | 112 | (saddr, daddr) = packet_addrs(packet) |
c4b6d990 IJ |
113 | if saddr != self._ip: |
114 | raise ValueError('wrong source address %s' % saddr) | |
ec0c4d95 | 115 | route(packet, saddr, daddr) |
ec88b1f1 | 116 | |
c4b6d990 IJ |
117 | def _req_cancel(self, request): |
118 | request.finish() | |
119 | ||
120 | def _req_error(self, err, request): | |
121 | self._req_cancel(request) | |
122 | ||
0ac316c8 | 123 | def queue_outbound(self, packet): |
650a3251 | 124 | self._pq.append(packet) |
0ac316c8 | 125 | |
c4b6d990 IJ |
126 | def http_request(self, request): |
127 | request.setHeader('Content-Type','application/octet-stream') | |
128 | reactor.callLater(self.max_request_time, self._req_cancel, request) | |
129 | request.notifyFinish().addErrback(self._req_error, request) | |
0ac316c8 IJ |
130 | self._rq.append(request) |
131 | self._check_outbound() | |
132 | ||
133 | def _check_outbound(self): | |
134 | while True: | |
135 | try: request = self._rq[0] | |
136 | except IndexError: request = None | |
137 | if request and request.finished: | |
138 | self._rq.popleft() | |
139 | continue | |
140 | ||
650a3251 | 141 | if not self._pq.nonempty(): |
0ac316c8 IJ |
142 | # no packets, oh well |
143 | continue | |
144 | ||
094ee3a2 IJ |
145 | if request is None: |
146 | # no request | |
147 | break | |
148 | ||
149 | # request, and also some non-expired packets | |
150 | while True: | |
650a3251 IJ |
151 | packet = self.pq.popleft() |
152 | if packet is None: break | |
094ee3a2 | 153 | |
b0cfbfce | 154 | encoded = slip.encode(packet) |
094ee3a2 IJ |
155 | |
156 | if request.sentLength > 0: | |
b0cfbfce | 157 | if (request.sentLength + len(slip.delimiter) |
094ee3a2 IJ |
158 | + len(encoded) > self.max_batch_down): |
159 | break | |
b0cfbfce | 160 | request.write(slip.delimiter) |
094ee3a2 IJ |
161 | |
162 | request.write(encoded) | |
163 | self._pq.popLeft() | |
164 | ||
165 | assert(request.sentLength) | |
166 | self._rq.popLeft() | |
167 | request.finish() | |
168 | # round again, looking for more to do | |
ec88b1f1 | 169 | |
650a3251 IJ |
170 | while len(self._rq) > self.target_requests_outstanding: |
171 | request = self._rq.popleft() | |
172 | request.finish() | |
173 | ||
5da7763e | 174 | class IphttpResource(twisted.web.resource.Resource): |
c1e4910b | 175 | isLeaf = True |
5da7763e IJ |
176 | def render_POST(self, request): |
177 | # find client, update config, etc. | |
e2d41dc1 | 178 | ci = ipaddr(request.args['i']) |
5da7763e IJ |
179 | c = clients[ci] |
180 | pw = request.args['pw'] | |
181 | if pw != c.pw: raise ValueError('bad password') | |
182 | ||
183 | # update config | |
184 | for r, w in (('mbd', 'max_batch_down'), | |
185 | ('mqt', 'max_queue_time'), | |
650a3251 IJ |
186 | ('mrt', 'max_request_time'), |
187 | ('tro', 'target_requests_outstanding')): | |
5da7763e IJ |
188 | try: v = request.args[r] |
189 | except KeyError: continue | |
190 | v = int(v) | |
191 | c.__dict__[w] = v | |
192 | ||
193 | try: d = request.args['d'] | |
194 | except KeyError: d = '' | |
195 | ||
196 | c.process_arriving_data(d) | |
197 | c.new_request(request) | |
198 | ||
8e279651 | 199 | def render_GET(self, request): |
040ff511 | 200 | return b'<html><body>hippotat</body></html>' |
8e279651 | 201 | |
5da7763e IJ |
202 | def start_http(): |
203 | resource = IphttpResource() | |
b11c6e7a | 204 | site = twisted.web.server.Site(resource) |
e2d41dc1 | 205 | for addrspec in cfg.get('server','addrs').split(): |
5da7763e IJ |
206 | try: |
207 | addr = ipaddress.IPv4Address(addrspec) | |
208 | endpointfactory = twisted.internet.endpoints.TCP4ServerEndpoint | |
209 | except AddressValueError: | |
210 | addr = ipaddress.IPv6Address(addrspec) | |
211 | endpointfactory = twisted.internet.endpoints.TCP6ServerEndpoint | |
212 | ep = endpointfactory(reactor, cfg.getint('server','port'), addr) | |
b11c6e7a | 213 | crash_on_defer(ep.listen(site)) |
5da7763e IJ |
214 | |
215 | #---------- config and setup ---------- | |
216 | ||
3fba9787 IJ |
217 | def process_cfg(): |
218 | global network | |
e75e9c17 IJ |
219 | global host |
220 | global relay | |
5bae5ba3 | 221 | global ipif_command |
3fba9787 | 222 | |
ec88b1f1 | 223 | network = ipnetwork(cfg.get('virtual','network')) |
e75e9c17 IJ |
224 | if network.num_addresses < 3 + 2: |
225 | raise ValueError('network needs at least 2^3 addresses') | |
226 | ||
3fba9787 | 227 | try: |
e75e9c17 IJ |
228 | host = cfg.get('virtual','host') |
229 | except NoOptionError: | |
e2d41dc1 | 230 | host = next(network.hosts()) |
e75e9c17 IJ |
231 | |
232 | try: | |
233 | relay = cfg.get('virtual','relay') | |
e2d41dc1 | 234 | except NoOptionError: |
e75e9c17 | 235 | for search in network.hosts(): |
e2d41dc1 | 236 | if search == host: continue |
e75e9c17 IJ |
237 | relay = search |
238 | break | |
3fba9787 | 239 | |
ec88b1f1 IJ |
240 | for cs in cfg.sections(): |
241 | if not (':' in cs or '.' in cs): continue | |
e2d41dc1 | 242 | ci = ipaddr(cs) |
ec88b1f1 IJ |
243 | if ci not in network: |
244 | raise ValueError('client %s not in network' % ci) | |
245 | if ci in clients: | |
246 | raise ValueError('multiple client cfg sections for %s' % ci) | |
247 | clients[ci] = Client(ci, cs) | |
3fba9787 | 248 | |
e2d41dc1 IJ |
249 | global mtu |
250 | mtu = cfg.get('virtual','mtu') | |
251 | ||
5bae5ba3 IJ |
252 | iic_vars = { } |
253 | for k in ('host','relay','mtu','network'): | |
254 | iic_vars[k] = globals()[k] | |
255 | ||
256 | ipif_command = cfg.get('server','ipif', vars=iic_vars) | |
257 | ||
e75e9c17 | 258 | def startup(): |
e2d41dc1 IJ |
259 | global cfg |
260 | ||
e75e9c17 IJ |
261 | op = OptionParser() |
262 | op.add_option('-c', '--config', dest='configfile', | |
263 | default='/etc/hippottd/server.conf') | |
264 | global opts | |
265 | (opts, args) = op.parse_args() | |
266 | if len(args): op.error('no non-option arguments please') | |
267 | ||
e2d41dc1 IJ |
268 | twisted.logger.globalLogPublisher.addObserver(crash_on_critical) |
269 | ||
e75e9c17 | 270 | cfg = ConfigParser() |
5bae5ba3 | 271 | cfg.read_string(defcfg) |
e2d41dc1 | 272 | cfg.read(opts.configfile) |
5bae5ba3 IJ |
273 | process_cfg() |
274 | ||
040ff511 | 275 | start_ipif(ipif_command, route) |
5bae5ba3 | 276 | start_http() |
e2d41dc1 IJ |
277 | |
278 | startup() | |
279 | reactor.run() | |
aa663282 | 280 | print('CRASHED (end)', file=sys.stderr) |