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Merge #18309: zmq: Add support to listen on multiple interfaces

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e66870c5a4 zmq: Append address to notify log output (nthumann)
241803da21 test: Add zmq test to support multiple interfaces (nthumann)
a0b2e5cb6a doc: Add release notes to support multiple interfaces (nthumann)
b1c3f180ec doc: Adjust ZMQ usage to support multiple interfaces (nthumann)
347c94f551 zmq: Add support to listen on multiple interfaces (Nicolas Thumann)

Pull request description:

  This PR adds support for ZeroMQ to listen on multiple interfaces, just like the RPC server.
  Currently, if you specify more than one e.g. `zmqpubhashblock` paramter, only the first one will be used. Therefore a user may be forced to listen on all interfaces (e.g. `zmqpubhashblock=0.0.0.0:28332`), which can result in an increased attack surface.
  With this PR a user can specify multiple interfaces to listen on, e.g.
  `-zmqpubhashblock=tcp://127.0.0.1:28332 -zmqpubhashblock=tcp://192.168.1.123:28332`.

ACKs for top commit:
  laanwj:
    Code review ACK e66870c5a4
  instagibbs:
    reACK e66870c5a4

Tree-SHA512: f38ab4a6ff00dc821e5f4842508cefadb701e70bb3893992c1b32049be20247c8aa9476a1f886050c5f17fe7f2ce99ee30193ce2c81a7482a5a51f8fc22300c7
This commit is contained in:
Wladimir J. van der Laan
2020-10-01 17:41:22 +02:00
parent 9fc2f011ba e66870c5a4
commit a0185d90a7
5 changed files with 40 additions and 12 deletions
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24
test/functional/interface_zmq.py
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@@ -75,6 +75,7 @@ class ZMQTest (BitcoinTestFramework):
self.test_sequence()
self.test_mempool_sync()
self.test_reorg()
self.test_multiple_interfaces()
finally:
# Destroy the ZMQ context.
self.log.debug("Destroying ZMQ context")
@@ -506,5 +507,28 @@ class ZMQTest (BitcoinTestFramework):
self.nodes[0].generatetoaddress(1, ADDRESS_BCRT1_UNSPENDABLE)
def test_multiple_interfaces(self):
# Set up two subscribers with different addresses
subscribers = []
for i in range(2):
address = 'tcp://127.0.0.1:%d' % (28334 + i)
socket = self.ctx.socket(zmq.SUB)
socket.set(zmq.RCVTIMEO, 60000)
hashblock = ZMQSubscriber(socket, b"hashblock")
socket.connect(address)
subscribers.append({'address': address, 'hashblock': hashblock})
self.restart_node(0, ['-zmqpub%s=%s' % (subscriber['hashblock'].topic.decode(), subscriber['address']) for subscriber in subscribers])
# Relax so that the subscriber is ready before publishing zmq messages
sleep(0.2)
# Generate 1 block in nodes[0] and receive all notifications
self.nodes[0].generatetoaddress(1, ADDRESS_BCRT1_UNSPENDABLE)
# Should receive the same block hash on both subscribers
assert_equal(self.nodes[0].getbestblockhash(), subscribers[0]['hashblock'].receive().hex())
assert_equal(self.nodes[0].getbestblockhash(), subscribers[1]['hashblock'].receive().hex())
if __name__ == '__main__':
ZMQTest().main()