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3fba9787 IJ |
1 | #!/usr/bin/python2 |
2 | ||
3 | from twisted.web.server import Site | |
4 | from twisted.web.resource import Resource | |
5 | from twisted.web.server import NOT_DONE_YET | |
6 | from twisted.internet import reactor | |
7 | ||
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 IJ |
31 | defcfg = u''' |
32 | [default] | |
33 | max_batch_down: 65536 | |
34 | max_queue_time: 10 | |
35 | max_request_time: 54 | |
36 | ||
37 | [global] | |
38 | max_batch_down: 262144 | |
39 | max_queue_time: 121 | |
40 | max_request_time: 121 | |
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) | |
67 | limit = cfg.getint('global',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 IJ |
83 | def queue_outbound(self, packet): |
84 | self._pq.append((time.time, packet)) | |
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 | |
105 | continue | |
106 | ||
107 | age = time.time() - queuetime | |
ec88b1f1 | 108 | |
3fba9787 IJ |
109 | def process_cfg(): |
110 | global network | |
111 | global ourself | |
112 | ||
ec88b1f1 | 113 | network = ipnetwork(cfg.get('virtual','network')) |
3fba9787 IJ |
114 | try: |
115 | ourself = cfg.get('virtual','server') | |
116 | except ConfigParser.NoOptionError: | |
117 | ourself = network.hosts().next() | |
118 | ||
ec88b1f1 IJ |
119 | for cs in cfg.sections(): |
120 | if not (':' in cs or '.' in cs): continue | |
121 | ci = ipaddress(cs) | |
122 | if ci not in network: | |
123 | raise ValueError('client %s not in network' % ci) | |
124 | if ci in clients: | |
125 | raise ValueError('multiple client cfg sections for %s' % ci) | |
126 | clients[ci] = Client(ci, cs) | |
3fba9787 IJ |
127 | |
128 | class FormPage(Resource): | |
129 | def render_POST(self, request): | |
ec88b1f1 IJ |
130 | # find client, update config, etc. |
131 | ci = ipaddress(request.args['i']) | |
132 | c = clients[ci] | |
133 | pw = request.args['pw'] | |
134 | if pw != c.pw: raise ValueError('bad password') | |
135 | ||
136 | # update config | |
137 | for r, w in (('mbd', 'max_batch_down'), | |
138 | ('mqt', 'max_queue_time'), | |
139 | ('mrt', 'max_request_time')): | |
140 | try: v = request.args[r] | |
141 | except KeyError: continue | |
142 | v = int(v) | |
c4b6d990 | 143 | c.__dict__[w] = v |
ec88b1f1 IJ |
144 | |
145 | try: d = request.args['d'] | |
146 | except KeyError: d = '' | |
147 | ||
148 | c.process_arriving_data(d) | |
c4b6d990 | 149 | c.new_request(request) |