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1# Copyright 2012 the V8 project authors. All rights reserved.
2# Redistribution and use in source and binary forms, with or without
3# modification, are permitted provided that the following conditions are
4# met:
5#
6#     * Redistributions of source code must retain the above copyright
7#       notice, this list of conditions and the following disclaimer.
8#     * Redistributions in binary form must reproduce the above
9#       copyright notice, this list of conditions and the following
10#       disclaimer in the documentation and/or other materials provided
11#       with the distribution.
12#     * Neither the name of Google Inc. nor the names of its
13#       contributors may be used to endorse or promote products derived
14#       from this software without specific prior written permission.
15#
16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28
29import socket
30import SocketServer
31
32from . import compression
33from . import constants
34
35
36def _StatusQuery(peer, query):
37  sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
38  code = sock.connect_ex((peer.address, constants.STATUS_PORT))
39  if code != 0:
40    # TODO(jkummerow): disconnect (after 3 failures?)
41    return
42  compression.Send(query, sock)
43  compression.Send(constants.END_OF_STREAM, sock)
44  rec = compression.Receiver(sock)
45  data = None
46  while not rec.IsDone():
47    data = rec.Current()
48    assert data[0] == query[0]
49    data = data[1]
50    rec.Advance()
51  sock.close()
52  return data
53
54
55def RequestTrustedPubkeys(peer, server):
56  pubkey_list = _StatusQuery(peer, [constants.LIST_TRUSTED_PUBKEYS])
57  for pubkey in pubkey_list:
58    if server.IsTrusted(pubkey): continue
59    result = _StatusQuery(peer, [constants.GET_SIGNED_PUBKEY, pubkey])
60    server.AcceptNewTrusted(result)
61
62
63def NotifyNewTrusted(peer, data):
64  _StatusQuery(peer, [constants.NOTIFY_NEW_TRUSTED] + data)
65
66
67def ITrustYouNow(peer):
68  _StatusQuery(peer, [constants.TRUST_YOU_NOW])
69
70
71def TryTransitiveTrust(peer, pubkey, server):
72  if _StatusQuery(peer, [constants.DO_YOU_TRUST, pubkey]):
73    result = _StatusQuery(peer, [constants.GET_SIGNED_PUBKEY, pubkey])
74    server.AcceptNewTrusted(result)
75
76
77class StatusHandler(SocketServer.BaseRequestHandler):
78  def handle(self):
79    rec = compression.Receiver(self.request)
80    while not rec.IsDone():
81      data = rec.Current()
82      action = data[0]
83
84      if action == constants.LIST_TRUSTED_PUBKEYS:
85        response = self.server.daemon.ListTrusted()
86        compression.Send([action, response], self.request)
87
88      elif action == constants.GET_SIGNED_PUBKEY:
89        response = self.server.daemon.SignTrusted(data[1])
90        compression.Send([action, response], self.request)
91
92      elif action == constants.NOTIFY_NEW_TRUSTED:
93        self.server.daemon.AcceptNewTrusted(data[1:])
94        pass  # No response.
95
96      elif action == constants.TRUST_YOU_NOW:
97        self.server.daemon.MarkPeerAsTrusting(self.client_address[0])
98        pass  # No response.
99
100      elif action == constants.DO_YOU_TRUST:
101        response = self.server.daemon.IsTrusted(data[1])
102        compression.Send([action, response], self.request)
103
104      rec.Advance()
105    compression.Send(constants.END_OF_STREAM, self.request)
106
107
108class StatusSocketServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
109  def __init__(self, daemon):
110    address = (daemon.ip, constants.STATUS_PORT)
111    SocketServer.TCPServer.__init__(self, address, StatusHandler)
112    self.daemon = daemon
113