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| 1 | +#!/usr/bin/env python3 |
| 2 | +# Copyright (c) 2017 The Bitcoin Core developers |
| 3 | +# Distributed under the MIT software license, see the accompanying |
| 4 | +# file COPYING or http://www.opensource.org/licenses/mit-license.php. |
| 5 | + |
| 6 | +from test_framework.mininode import * |
| 7 | +from test_framework.test_framework import BitcoinTestFramework |
| 8 | +from test_framework.util import * |
| 9 | + |
| 10 | +''' |
| 11 | +Test for message sending before handshake completion |
| 12 | +
|
| 13 | +A node should never send anything other than VERSION/VERACK/REJECT until it's |
| 14 | +received a VERACK. |
| 15 | +
|
| 16 | +This test connects to a node and sends it a few messages, trying to intice it |
| 17 | +into sending us something it shouldn't. |
| 18 | +''' |
| 19 | + |
| 20 | +banscore = 10 |
| 21 | + |
| 22 | +class CLazyNode(NodeConnCB): |
| 23 | + def __init__(self): |
| 24 | + self.connection = None |
| 25 | + self.unexpected_msg = False |
| 26 | + self.connected = False |
| 27 | + super().__init__() |
| 28 | + |
| 29 | + def add_connection(self, conn): |
| 30 | + self.connection = conn |
| 31 | + |
| 32 | + def send_message(self, message): |
| 33 | + self.connection.send_message(message) |
| 34 | + |
| 35 | + def bad_message(self, message): |
| 36 | + self.unexpected_msg = True |
| 37 | + print("should not have received message: %s" % message.command) |
| 38 | + |
| 39 | + def on_open(self, conn): |
| 40 | + self.connected = True |
| 41 | + |
| 42 | + def on_version(self, conn, message): self.bad_message(message) |
| 43 | + def on_verack(self, conn, message): self.bad_message(message) |
| 44 | + def on_reject(self, conn, message): self.bad_message(message) |
| 45 | + def on_inv(self, conn, message): self.bad_message(message) |
| 46 | + def on_addr(self, conn, message): self.bad_message(message) |
| 47 | + def on_alert(self, conn, message): self.bad_message(message) |
| 48 | + def on_getdata(self, conn, message): self.bad_message(message) |
| 49 | + def on_getblocks(self, conn, message): self.bad_message(message) |
| 50 | + def on_tx(self, conn, message): self.bad_message(message) |
| 51 | + def on_block(self, conn, message): self.bad_message(message) |
| 52 | + def on_getaddr(self, conn, message): self.bad_message(message) |
| 53 | + def on_headers(self, conn, message): self.bad_message(message) |
| 54 | + def on_getheaders(self, conn, message): self.bad_message(message) |
| 55 | + def on_ping(self, conn, message): self.bad_message(message) |
| 56 | + def on_mempool(self, conn): self.bad_message(message) |
| 57 | + def on_pong(self, conn, message): self.bad_message(message) |
| 58 | + def on_feefilter(self, conn, message): self.bad_message(message) |
| 59 | + def on_sendheaders(self, conn, message): self.bad_message(message) |
| 60 | + def on_sendcmpct(self, conn, message): self.bad_message(message) |
| 61 | + def on_cmpctblock(self, conn, message): self.bad_message(message) |
| 62 | + def on_getblocktxn(self, conn, message): self.bad_message(message) |
| 63 | + def on_blocktxn(self, conn, message): self.bad_message(message) |
| 64 | + |
| 65 | +# Node that never sends a version. We'll use this to send a bunch of messages |
| 66 | +# anyway, and eventually get disconnected. |
| 67 | +class CNodeNoVersionBan(CLazyNode): |
| 68 | + def __init__(self): |
| 69 | + super().__init__() |
| 70 | + |
| 71 | + # send a bunch of veracks without sending a message. This should get us disconnected. |
| 72 | + # NOTE: implementation-specific check here. Remove if bitcoind ban behavior changes |
| 73 | + def on_open(self, conn): |
| 74 | + super().on_open(conn) |
| 75 | + for i in range(banscore): |
| 76 | + self.send_message(msg_verack()) |
| 77 | + |
| 78 | + def on_reject(self, conn, message): pass |
| 79 | + |
| 80 | +# Node that never sends a version. This one just sits idle and hopes to receive |
| 81 | +# any message (it shouldn't!) |
| 82 | +class CNodeNoVersionIdle(CLazyNode): |
| 83 | + def __init__(self): |
| 84 | + super().__init__() |
| 85 | + |
| 86 | +# Node that sends a version but not a verack. |
| 87 | +class CNodeNoVerackIdle(CLazyNode): |
| 88 | + def __init__(self): |
| 89 | + self.version_received = False |
| 90 | + super().__init__() |
| 91 | + |
| 92 | + def on_reject(self, conn, message): pass |
| 93 | + def on_verack(self, conn, message): pass |
| 94 | + # When version is received, don't reply with a verack. Instead, see if the |
| 95 | + # node will give us a message that it shouldn't. This is not an exhaustive |
| 96 | + # list! |
| 97 | + def on_version(self, conn, message): |
| 98 | + self.version_received = True |
| 99 | + conn.send_message(msg_ping()) |
| 100 | + conn.send_message(msg_getaddr()) |
| 101 | + |
| 102 | +class P2PLeakTest(BitcoinTestFramework): |
| 103 | + def __init__(self): |
| 104 | + super().__init__() |
| 105 | + self.num_nodes = 1 |
| 106 | + def setup_network(self): |
| 107 | + extra_args = [['-debug', '-banscore='+str(banscore)] |
| 108 | + for i in range(self.num_nodes)] |
| 109 | + self.nodes = start_nodes(self.num_nodes, self.options.tmpdir, extra_args) |
| 110 | + |
| 111 | + def run_test(self): |
| 112 | + no_version_bannode = CNodeNoVersionBan() |
| 113 | + no_version_idlenode = CNodeNoVersionIdle() |
| 114 | + no_verack_idlenode = CNodeNoVerackIdle() |
| 115 | + |
| 116 | + connections = [] |
| 117 | + connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], no_version_bannode, send_version=False)) |
| 118 | + connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], no_version_idlenode, send_version=False)) |
| 119 | + connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], no_verack_idlenode)) |
| 120 | + no_version_bannode.add_connection(connections[0]) |
| 121 | + no_version_idlenode.add_connection(connections[1]) |
| 122 | + no_verack_idlenode.add_connection(connections[2]) |
| 123 | + |
| 124 | + NetworkThread().start() # Start up network handling in another thread |
| 125 | + |
| 126 | + assert(wait_until(lambda: no_version_bannode.connected and no_version_idlenode.connected and no_verack_idlenode.version_received, timeout=10)) |
| 127 | + |
| 128 | + # Mine a block and make sure that it's not sent to the connected nodes |
| 129 | + self.nodes[0].generate(1) |
| 130 | + |
| 131 | + #Give the node enough time to possibly leak out a message |
| 132 | + time.sleep(5) |
| 133 | + |
| 134 | + #This node should have been banned |
| 135 | + assert(no_version_bannode.connection.state == "closed") |
| 136 | + |
| 137 | + [conn.disconnect_node() for conn in connections] |
| 138 | + |
| 139 | + # Make sure no unexpected messages came in |
| 140 | + assert(no_version_bannode.unexpected_msg == False) |
| 141 | + assert(no_version_idlenode.unexpected_msg == False) |
| 142 | + assert(no_verack_idlenode.unexpected_msg == False) |
| 143 | + |
| 144 | +if __name__ == '__main__': |
| 145 | + P2PLeakTest().main() |
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