aboutsummaryrefslogtreecommitdiff
path: root/test/functional/p2p_addr_relay.py
blob: e2e9b6dcb24db143a413e46ea583bb40912a0bcf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
#!/usr/bin/env python3
# Copyright (c) 2020-2021 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""
Test addr relay
"""

import random
import time

from test_framework.messages import (
    CAddress,
    msg_addr,
    msg_getaddr,
    msg_verack,
)
from test_framework.p2p import (
    P2PInterface,
    p2p_lock,
    P2P_SERVICES,
)
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
    assert_equal,
    assert_greater_than,
    assert_greater_than_or_equal
)

ONE_MINUTE  = 60
TEN_MINUTES = 10 * ONE_MINUTE
ONE_HOUR    = 60 * ONE_MINUTE
TWO_HOURS   =  2 * ONE_HOUR
ONE_DAY     = 24 * ONE_HOUR

ADDR_DESTINATIONS_THRESHOLD = 4

class AddrReceiver(P2PInterface):
    num_ipv4_received = 0
    test_addr_contents = False
    _tokens = 1
    send_getaddr = True

    def __init__(self, test_addr_contents=False, send_getaddr=True):
        super().__init__()
        self.test_addr_contents = test_addr_contents
        self.send_getaddr = send_getaddr

    def on_addr(self, message):
        for addr in message.addrs:
            self.num_ipv4_received += 1
            if(self.test_addr_contents):
                # relay_tests checks the content of the addr messages match
                # expectations based on the message creation in setup_addr_msg
                assert_equal(addr.nServices, 9)
                if not 8333 <= addr.port < 8343:
                    raise AssertionError("Invalid addr.port of {} (8333-8342 expected)".format(addr.port))
                assert addr.ip.startswith('123.123.')

    def on_getaddr(self, message):
        # When the node sends us a getaddr, it increments the addr relay tokens for the connection by 1000
        self._tokens += 1000

    @property
    def tokens(self):
        with p2p_lock:
            return self._tokens

    def increment_tokens(self, n):
        # When we move mocktime forward, the node increments the addr relay tokens for its peers
        with p2p_lock:
            self._tokens += n

    def addr_received(self):
        return self.num_ipv4_received != 0

    def on_version(self, message):
        self.send_message(msg_verack())
        if (self.send_getaddr):
            self.send_message(msg_getaddr())

    def getaddr_received(self):
        return self.message_count['getaddr'] > 0


class AddrTest(BitcoinTestFramework):
    counter = 0
    mocktime = int(time.time())

    def set_test_params(self):
        self.num_nodes = 1
        self.extra_args = [["-whitelist=addr@127.0.0.1"]]

    def run_test(self):
        self.oversized_addr_test()
        self.relay_tests()
        self.inbound_blackhole_tests()

        self.destination_rotates_once_in_24_hours_test()
        self.destination_rotates_more_than_once_over_several_days_test()

        # This test populates the addrman, which can impact the node's behavior
        # in subsequent tests
        self.getaddr_tests()
        self.blocksonly_mode_tests()
        self.rate_limit_tests()

    def setup_addr_msg(self, num, sequential_ips=True):
        addrs = []
        for i in range(num):
            addr = CAddress()
            addr.time = self.mocktime + random.randrange(-100, 100)
            addr.nServices = P2P_SERVICES
            if sequential_ips:
                assert self.counter < 256 ** 2  # Don't allow the returned ip addresses to wrap.
                addr.ip = f"123.123.{self.counter // 256}.{self.counter % 256}"
                self.counter += 1
            else:
                addr.ip = f"{random.randrange(128,169)}.{random.randrange(1,255)}.{random.randrange(1,255)}.{random.randrange(1,255)}"
            addr.port = 8333 + i
            addrs.append(addr)

        msg = msg_addr()
        msg.addrs = addrs
        return msg

    def send_addr_msg(self, source, msg, receivers):
        source.send_and_ping(msg)
        # invoke m_next_addr_send timer:
        # `addr` messages are sent on an exponential distribution with mean interval of 30s.
        # Setting the mocktime 600s forward gives a probability of (1 - e^-(600/30)) that
        # the event will occur (i.e. this fails once in ~500 million repeats).
        self.mocktime += 10 * 60
        self.nodes[0].setmocktime(self.mocktime)
        for peer in receivers:
            peer.sync_send_with_ping()

    def oversized_addr_test(self):
        self.log.info('Send an addr message that is too large')
        addr_source = self.nodes[0].add_p2p_connection(P2PInterface())

        msg = self.setup_addr_msg(1010)
        with self.nodes[0].assert_debug_log(['addr message size = 1010']):
            addr_source.send_and_ping(msg)

        self.nodes[0].disconnect_p2ps()

    def relay_tests(self):
        self.log.info('Test address relay')
        self.log.info('Check that addr message content is relayed and added to addrman')
        addr_source = self.nodes[0].add_p2p_connection(P2PInterface())
        num_receivers = 7
        receivers = []
        for _ in range(num_receivers):
            receivers.append(self.nodes[0].add_p2p_connection(AddrReceiver(test_addr_contents=True)))

        # Keep this with length <= 10. Addresses from larger messages are not
        # relayed.
        num_ipv4_addrs = 10
        msg = self.setup_addr_msg(num_ipv4_addrs)
        with self.nodes[0].assert_debug_log(
            [
                'received: addr (301 bytes) peer=1',
            ]
        ):
            self.send_addr_msg(addr_source, msg, receivers)

        total_ipv4_received = sum(r.num_ipv4_received for r in receivers)

        # Every IPv4 address must be relayed to two peers, other than the
        # originating node (addr_source).
        ipv4_branching_factor = 2
        assert_equal(total_ipv4_received, num_ipv4_addrs * ipv4_branching_factor)

        self.nodes[0].disconnect_p2ps()

        self.log.info('Check relay of addresses received from outbound peers')
        inbound_peer = self.nodes[0].add_p2p_connection(AddrReceiver(test_addr_contents=True, send_getaddr=False))
        full_outbound_peer = self.nodes[0].add_outbound_p2p_connection(AddrReceiver(), p2p_idx=0, connection_type="outbound-full-relay")
        msg = self.setup_addr_msg(2)
        self.send_addr_msg(full_outbound_peer, msg, [inbound_peer])
        self.log.info('Check that the first addr message received from an outbound peer is not relayed')
        # Currently, there is a flag that prevents the first addr message received
        # from a new outbound peer to be relayed to others. Originally meant to prevent
        # large GETADDR responses from being relayed, it now typically affects the self-announcement
        # of the outbound peer which is often sent before the GETADDR response.
        assert_equal(inbound_peer.num_ipv4_received, 0)

        # Send an empty ADDR message to initialize address relay on this connection.
        inbound_peer.send_and_ping(msg_addr())

        self.log.info('Check that subsequent addr messages sent from an outbound peer are relayed')
        msg2 = self.setup_addr_msg(2)
        self.send_addr_msg(full_outbound_peer, msg2, [inbound_peer])
        assert_equal(inbound_peer.num_ipv4_received, 2)

        self.log.info('Check address relay to outbound peers')
        block_relay_peer = self.nodes[0].add_outbound_p2p_connection(AddrReceiver(), p2p_idx=1, connection_type="block-relay-only")
        msg3 = self.setup_addr_msg(2)
        self.send_addr_msg(inbound_peer, msg3, [full_outbound_peer, block_relay_peer])

        self.log.info('Check that addresses are relayed to full outbound peers')
        assert_equal(full_outbound_peer.num_ipv4_received, 2)
        self.log.info('Check that addresses are not relayed to block-relay-only outbound peers')
        assert_equal(block_relay_peer.num_ipv4_received, 0)

        self.nodes[0].disconnect_p2ps()

    def sum_addr_messages(self, msgs_dict):
        return sum(bytes_received for (msg, bytes_received) in msgs_dict.items() if msg in ['addr', 'addrv2', 'getaddr'])

    def inbound_blackhole_tests(self):
        self.log.info('Check that we only relay addresses to inbound peers who have previously sent us addr related messages')

        addr_source = self.nodes[0].add_p2p_connection(P2PInterface())
        receiver_peer = self.nodes[0].add_p2p_connection(AddrReceiver())
        blackhole_peer = self.nodes[0].add_p2p_connection(AddrReceiver(send_getaddr=False))
        initial_addrs_received = receiver_peer.num_ipv4_received

        peerinfo = self.nodes[0].getpeerinfo()
        assert_equal(peerinfo[0]['addr_relay_enabled'], True)  # addr_source
        assert_equal(peerinfo[1]['addr_relay_enabled'], True)  # receiver_peer
        assert_equal(peerinfo[2]['addr_relay_enabled'], False)  # blackhole_peer

        # addr_source sends 2 addresses to node0
        msg = self.setup_addr_msg(2)
        addr_source.send_and_ping(msg)
        self.mocktime += 30 * 60
        self.nodes[0].setmocktime(self.mocktime)
        receiver_peer.sync_with_ping()
        blackhole_peer.sync_with_ping()

        peerinfo = self.nodes[0].getpeerinfo()

        # Confirm node received addr-related messages from receiver peer
        assert_greater_than(self.sum_addr_messages(peerinfo[1]['bytesrecv_per_msg']), 0)
        # And that peer received addresses
        assert_equal(receiver_peer.num_ipv4_received - initial_addrs_received, 2)

        # Confirm node has not received addr-related messages from blackhole peer
        assert_equal(self.sum_addr_messages(peerinfo[2]['bytesrecv_per_msg']), 0)
        # And that peer did not receive addresses
        assert_equal(blackhole_peer.num_ipv4_received, 0)

        self.log.info("After blackhole peer sends addr message, it becomes eligible for addr gossip")
        blackhole_peer.send_and_ping(msg_addr())

        # Confirm node has now received addr-related messages from blackhole peer
        assert_greater_than(self.sum_addr_messages(peerinfo[1]['bytesrecv_per_msg']), 0)
        assert_equal(self.nodes[0].getpeerinfo()[2]['addr_relay_enabled'], True)

        msg = self.setup_addr_msg(2)
        self.send_addr_msg(addr_source, msg, [receiver_peer, blackhole_peer])

        # And that peer received addresses
        assert_equal(blackhole_peer.num_ipv4_received, 2)

        self.nodes[0].disconnect_p2ps()

    def getaddr_tests(self):
        # In the previous tests, the node answered GETADDR requests with an
        # empty addrman. Due to GETADDR response caching (see
        # CConnman::GetAddresses), the node would continue to provide 0 addrs
        # in response until enough time has passed or the node is restarted.
        self.restart_node(0)

        self.log.info('Test getaddr behavior')
        self.log.info('Check that we send a getaddr message upon connecting to an outbound-full-relay peer')
        full_outbound_peer = self.nodes[0].add_outbound_p2p_connection(AddrReceiver(), p2p_idx=0, connection_type="outbound-full-relay")
        full_outbound_peer.sync_with_ping()
        assert full_outbound_peer.getaddr_received()

        self.log.info('Check that we do not send a getaddr message upon connecting to a block-relay-only peer')
        block_relay_peer = self.nodes[0].add_outbound_p2p_connection(AddrReceiver(), p2p_idx=1, connection_type="block-relay-only")
        block_relay_peer.sync_with_ping()
        assert_equal(block_relay_peer.getaddr_received(), False)

        self.log.info('Check that we answer getaddr messages only from inbound peers')
        inbound_peer = self.nodes[0].add_p2p_connection(AddrReceiver(send_getaddr=False))
        inbound_peer.sync_with_ping()

        # Add some addresses to addrman
        for i in range(1000):
            first_octet = i >> 8
            second_octet = i % 256
            a = f"{first_octet}.{second_octet}.1.1"
            self.nodes[0].addpeeraddress(a, 8333)

        full_outbound_peer.send_and_ping(msg_getaddr())
        block_relay_peer.send_and_ping(msg_getaddr())
        inbound_peer.send_and_ping(msg_getaddr())

        # invoke m_next_addr_send timer, see under send_addr_msg() function for rationale
        self.mocktime += 10 * 60
        self.nodes[0].setmocktime(self.mocktime)
        inbound_peer.wait_until(lambda: inbound_peer.addr_received() is True)

        assert_equal(full_outbound_peer.num_ipv4_received, 0)
        assert_equal(block_relay_peer.num_ipv4_received, 0)
        assert inbound_peer.num_ipv4_received > 100

        self.nodes[0].disconnect_p2ps()

    def blocksonly_mode_tests(self):
        self.log.info('Test addr relay in -blocksonly mode')
        self.restart_node(0, ["-blocksonly", "-whitelist=addr@127.0.0.1"])
        self.mocktime = int(time.time())

        self.log.info('Check that we send getaddr messages')
        full_outbound_peer = self.nodes[0].add_outbound_p2p_connection(AddrReceiver(), p2p_idx=0, connection_type="outbound-full-relay")
        full_outbound_peer.sync_with_ping()
        assert full_outbound_peer.getaddr_received()

        self.log.info('Check that we relay address messages')
        addr_source = self.nodes[0].add_p2p_connection(P2PInterface())
        msg = self.setup_addr_msg(2)
        self.send_addr_msg(addr_source, msg, [full_outbound_peer])
        assert_equal(full_outbound_peer.num_ipv4_received, 2)

        self.nodes[0].disconnect_p2ps()

    def send_addrs_and_test_rate_limiting(self, peer, no_relay, *, new_addrs, total_addrs):
        """Send an addr message and check that the number of addresses processed and rate-limited is as expected"""

        peer.send_and_ping(self.setup_addr_msg(new_addrs, sequential_ips=False))

        peerinfo = self.nodes[0].getpeerinfo()[0]
        addrs_processed = peerinfo['addr_processed']
        addrs_rate_limited = peerinfo['addr_rate_limited']
        self.log.debug(f"addrs_processed = {addrs_processed}, addrs_rate_limited = {addrs_rate_limited}")

        if no_relay:
            assert_equal(addrs_processed, 0)
            assert_equal(addrs_rate_limited, 0)
        else:
            assert_equal(addrs_processed, min(total_addrs, peer.tokens))
            assert_equal(addrs_rate_limited, max(0, total_addrs - peer.tokens))

    def rate_limit_tests(self):
        self.mocktime = int(time.time())
        self.restart_node(0, [])
        self.nodes[0].setmocktime(self.mocktime)

        for conn_type, no_relay in [("outbound-full-relay", False), ("block-relay-only", True), ("inbound", False)]:
            self.log.info(f'Test rate limiting of addr processing for {conn_type} peers')
            if conn_type == "inbound":
                peer = self.nodes[0].add_p2p_connection(AddrReceiver())
            else:
                peer = self.nodes[0].add_outbound_p2p_connection(AddrReceiver(), p2p_idx=0, connection_type=conn_type)

            # Send 600 addresses. For all but the block-relay-only peer this should result in addresses being processed.
            self.send_addrs_and_test_rate_limiting(peer, no_relay, new_addrs=600, total_addrs=600)

            # Send 600 more addresses. For the outbound-full-relay peer (which we send a GETADDR, and thus will
            # process up to 1001 incoming addresses), this means more addresses will be processed.
            self.send_addrs_and_test_rate_limiting(peer, no_relay, new_addrs=600, total_addrs=1200)

            # Send 10 more. As we reached the processing limit for all nodes, no more addresses should be procesesd.
            self.send_addrs_and_test_rate_limiting(peer, no_relay, new_addrs=10, total_addrs=1210)

            # Advance the time by 100 seconds, permitting the processing of 10 more addresses.
            # Send 200 and verify that 10 are processed.
            self.mocktime += 100
            self.nodes[0].setmocktime(self.mocktime)
            peer.increment_tokens(10)

            self.send_addrs_and_test_rate_limiting(peer, no_relay, new_addrs=200, total_addrs=1410)

            # Advance the time by 1000 seconds, permitting the processing of 100 more addresses.
            # Send 200 and verify that 100 are processed.
            self.mocktime += 1000
            self.nodes[0].setmocktime(self.mocktime)
            peer.increment_tokens(100)

            self.send_addrs_and_test_rate_limiting(peer, no_relay, new_addrs=200, total_addrs=1610)

            self.nodes[0].disconnect_p2ps()

    def get_nodes_that_received_addr(self, peer, receiver_peer, addr_receivers,
                                     time_interval_1, time_interval_2):

        # Clean addr response related to the initial getaddr. There is no way to avoid initial
        # getaddr because the peer won't self-announce then.
        for addr_receiver in addr_receivers:
            addr_receiver.num_ipv4_received = 0

        for _ in range(10):
            self.mocktime += time_interval_1
            self.msg.addrs[0].time = self.mocktime + TEN_MINUTES
            self.nodes[0].setmocktime(self.mocktime)
            with self.nodes[0].assert_debug_log(['received: addr (31 bytes) peer=0']):
                peer.send_and_ping(self.msg)
                self.mocktime += time_interval_2
                self.nodes[0].setmocktime(self.mocktime)
                receiver_peer.sync_with_ping()
        return [node for node in addr_receivers if node.addr_received()]

    def destination_rotates_once_in_24_hours_test(self):
        self.restart_node(0, [])

        self.log.info('Test within 24 hours an addr relay destination is rotated at most once')
        self.mocktime = int(time.time())
        self.msg = self.setup_addr_msg(1)
        self.addr_receivers = []
        peer = self.nodes[0].add_p2p_connection(P2PInterface())
        receiver_peer = self.nodes[0].add_p2p_connection(AddrReceiver())
        addr_receivers = [self.nodes[0].add_p2p_connection(AddrReceiver()) for _ in range(20)]
        nodes_received_addr = self.get_nodes_that_received_addr(peer, receiver_peer, addr_receivers, 0, TWO_HOURS)  # 10 intervals of 2 hours
        # Per RelayAddress, we would announce these addrs to 2 destinations per day.
        # Since it's at most one rotation, at most 4 nodes can receive ADDR.
        assert_greater_than_or_equal(ADDR_DESTINATIONS_THRESHOLD, len(nodes_received_addr))
        self.nodes[0].disconnect_p2ps()

    def destination_rotates_more_than_once_over_several_days_test(self):
        self.restart_node(0, [])

        self.log.info('Test after several days an addr relay destination is rotated more than once')
        self.msg = self.setup_addr_msg(1)
        peer = self.nodes[0].add_p2p_connection(P2PInterface())
        receiver_peer = self.nodes[0].add_p2p_connection(AddrReceiver())
        addr_receivers = [self.nodes[0].add_p2p_connection(AddrReceiver()) for _ in range(20)]
        # 10 intervals of 1 day (+ 1 hour, which should be enough to cover 30-min Poisson in most cases)
        nodes_received_addr = self.get_nodes_that_received_addr(peer, receiver_peer, addr_receivers, ONE_DAY, ONE_HOUR)
        # Now that there should have been more than one rotation, more than
        # ADDR_DESTINATIONS_THRESHOLD nodes should have received ADDR.
        assert_greater_than(len(nodes_received_addr), ADDR_DESTINATIONS_THRESHOLD)
        self.nodes[0].disconnect_p2ps()


if __name__ == '__main__':
    AddrTest().main()