Commit | Line | Data |
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094ee3a2 | 1 | #!/usr/bin/python3 |
3fba9787 | 2 | |
094ee3a2 | 3 | import twisted.web.server import Site |
3fba9787 IJ |
4 | from twisted.web.resource import Resource |
5 | from twisted.web.server import NOT_DONE_YET | |
6 | from twisted.internet import reactor | |
7 | ||
094ee3a2 | 8 | import configparser |
ec88b1f1 | 9 | import ipaddress |
3fba9787 | 10 | |
0ac316c8 IJ |
11 | import collections |
12 | ||
c4b6d990 IJ |
13 | import syslog |
14 | ||
3fba9787 IJ |
15 | clients = { } |
16 | ||
17 | def ipaddress(input): | |
18 | try: | |
ec88b1f1 | 19 | r = ipaddress.IPv4Address(input) |
3fba9787 | 20 | except AddressValueError: |
ec88b1f1 | 21 | r = ipaddress.IPv6Address(input) |
3fba9787 IJ |
22 | return r |
23 | ||
24 | def ipnetwork(input): | |
25 | try: | |
ec88b1f1 | 26 | r = ipaddress.IPv4Network(input) |
3fba9787 | 27 | except NetworkValueError: |
ec88b1f1 | 28 | r = ipaddress.IPv6Network(input) |
3fba9787 IJ |
29 | return r |
30 | ||
ec88b1f1 | 31 | defcfg = u''' |
094ee3a2 IJ |
32 | [DEFAULT] |
33 | max_batch_down = 65536 | |
34 | max_queue_time = 10 | |
35 | max_request_time = 54 | |
36 | ||
37 | [limits] | |
38 | max_batch_down = 262144 | |
39 | max_queue_time = 121 | |
40 | max_request_time = 121 | |
ec88b1f1 IJ |
41 | ''' |
42 | ||
c4b6d990 IJ |
43 | def route(packet. daddr): |
44 | try: client = clients[daddr] | |
45 | except KeyError: dclient = None | |
46 | if dclient is not None: | |
0ac316c8 | 47 | dclient.queue_outbound(packet) |
c4b6d990 | 48 | else if daddr = server or daddr not in network: |
0ac316c8 | 49 | queue_inbound(packet) |
c4b6d990 IJ |
50 | else: |
51 | syslog.syslog(syslog.LOG_DEBUG, 'no client for %s' % daddr) | |
52 | ||
ec88b1f1 | 53 | class Client(): |
c4b6d990 | 54 | def __init__(self, ip, cs): |
ec88b1f1 IJ |
55 | # instance data members |
56 | self._ip = ip | |
57 | self._cs = cs | |
58 | self.pw = cfg.get(cs, 'password') | |
0ac316c8 IJ |
59 | self._rq = collections.deque() # requests |
60 | self._pq = collections.deque() # packets | |
c4b6d990 IJ |
61 | # plus from config: |
62 | # .max_batch_down | |
63 | # .max_queue_time | |
64 | # .max_request_time | |
ec88b1f1 IJ |
65 | for k in ('max_batch_down','max_queue_time','max_request_time'): |
66 | req = cfg.getint(cs, k) | |
094ee3a2 | 67 | limit = cfg.getint('limits',k) |
c4b6d990 IJ |
68 | self.__dict__[k] = min(req, limit) |
69 | ||
70 | def process_arriving_data(self, d): | |
71 | for packet in slip_decode(d): | |
72 | (saddr, daddr) = ip_64_addrs(packet) | |
73 | if saddr != self._ip: | |
74 | raise ValueError('wrong source address %s' % saddr) | |
75 | route(packet, daddr) | |
ec88b1f1 | 76 | |
c4b6d990 IJ |
77 | def _req_cancel(self, request): |
78 | request.finish() | |
79 | ||
80 | def _req_error(self, err, request): | |
81 | self._req_cancel(request) | |
82 | ||
0ac316c8 | 83 | def queue_outbound(self, packet): |
094ee3a2 | 84 | self._pq.append((time.monotonic(), packet)) |
0ac316c8 | 85 | |
c4b6d990 IJ |
86 | def http_request(self, request): |
87 | request.setHeader('Content-Type','application/octet-stream') | |
88 | reactor.callLater(self.max_request_time, self._req_cancel, request) | |
89 | request.notifyFinish().addErrback(self._req_error, request) | |
0ac316c8 IJ |
90 | self._rq.append(request) |
91 | self._check_outbound() | |
92 | ||
93 | def _check_outbound(self): | |
94 | while True: | |
95 | try: request = self._rq[0] | |
96 | except IndexError: request = None | |
97 | if request and request.finished: | |
98 | self._rq.popleft() | |
99 | continue | |
100 | ||
101 | # now request is an unfinished request, or None | |
102 | try: (queuetime, packet) = self._pq[0] | |
103 | except: IndexError: | |
104 | # no packets, oh well | |
094ee3a2 IJ |
105 | break |
106 | ||
107 | age = time.monotonic() - queuetime | |
108 | if age > self.max_queue_time: | |
109 | self._pq.popleft() | |
0ac316c8 IJ |
110 | continue |
111 | ||
094ee3a2 IJ |
112 | if request is None: |
113 | # no request | |
114 | break | |
115 | ||
116 | # request, and also some non-expired packets | |
117 | while True: | |
118 | try: (dummy, packet) = self._pq[0] | |
119 | except IndexError: break | |
120 | ||
121 | encoded = slip_encode(packet) | |
122 | ||
123 | if request.sentLength > 0: | |
124 | if (request.sentLength + len(slip_delimiter) | |
125 | + len(encoded) > self.max_batch_down): | |
126 | break | |
127 | request.write(slip_delimiter) | |
128 | ||
129 | request.write(encoded) | |
130 | self._pq.popLeft() | |
131 | ||
132 | assert(request.sentLength) | |
133 | self._rq.popLeft() | |
134 | request.finish() | |
135 | # round again, looking for more to do | |
ec88b1f1 | 136 | |
3fba9787 IJ |
137 | def process_cfg(): |
138 | global network | |
139 | global ourself | |
140 | ||
ec88b1f1 | 141 | network = ipnetwork(cfg.get('virtual','network')) |
3fba9787 IJ |
142 | try: |
143 | ourself = cfg.get('virtual','server') | |
144 | except ConfigParser.NoOptionError: | |
145 | ourself = network.hosts().next() | |
146 | ||
ec88b1f1 IJ |
147 | for cs in cfg.sections(): |
148 | if not (':' in cs or '.' in cs): continue | |
149 | ci = ipaddress(cs) | |
150 | if ci not in network: | |
151 | raise ValueError('client %s not in network' % ci) | |
152 | if ci in clients: | |
153 | raise ValueError('multiple client cfg sections for %s' % ci) | |
154 | clients[ci] = Client(ci, cs) | |
3fba9787 IJ |
155 | |
156 | class FormPage(Resource): | |
157 | def render_POST(self, request): | |
ec88b1f1 IJ |
158 | # find client, update config, etc. |
159 | ci = ipaddress(request.args['i']) | |
160 | c = clients[ci] | |
161 | pw = request.args['pw'] | |
162 | if pw != c.pw: raise ValueError('bad password') | |
163 | ||
164 | # update config | |
165 | for r, w in (('mbd', 'max_batch_down'), | |
166 | ('mqt', 'max_queue_time'), | |
167 | ('mrt', 'max_request_time')): | |
168 | try: v = request.args[r] | |
169 | except KeyError: continue | |
170 | v = int(v) | |
c4b6d990 | 171 | c.__dict__[w] = v |
ec88b1f1 IJ |
172 | |
173 | try: d = request.args['d'] | |
174 | except KeyError: d = '' | |
175 | ||
176 | c.process_arriving_data(d) | |
c4b6d990 | 177 | c.new_request(request) |