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Disconnect peers violating blocks-only mode

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If we set fRelay=false in our VERSION message, and a peer sends an INV or TX
message anyway, disconnect. Since we use fRelay=false to minimize bandwidth,
we should not tolerate remaining connected to a peer violating the protocol.
This commit is contained in:
Suhas Daftuar 2019-08-28 17:23:45 -04:00
parent 937eba91e1
commit 0ba08020c9
2 changed files with 13 additions and 5 deletions
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8
src/net_processing.cpp
View file

@ -2266,7 +2266,9 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
{
pfrom->AddInventoryKnown(inv);
if (fBlocksOnly) {
LogPrint(BCLog::NET, "transaction (%s) inv sent in violation of protocol peer=%d\n", inv.hash.ToString(), pfrom->GetId());
LogPrint(BCLog::NET, "transaction (%s) inv sent in violation of protocol, disconnecting peer=%d\n", inv.hash.ToString(), pfrom->GetId());
pfrom->fDisconnect = true;
return true;
} else if (!fAlreadyHave && !fImporting && !fReindex && !::ChainstateActive().IsInitialBlockDownload()) {
RequestTx(State(pfrom->GetId()), inv.hash, current_time);
}
@ -2483,9 +2485,11 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
if (strCommand == NetMsgType::TX) {
// Stop processing the transaction early if
// We are in blocks only mode and peer is either not whitelisted or whitelistrelay is off
if (!g_relay_txes && !pfrom->HasPermission(PF_RELAY))
// or if this peer is supposed to be a block-relay-only peer
if ((!g_relay_txes && !pfrom->HasPermission(PF_RELAY)) || (pfrom->m_tx_relay == nullptr))
{
LogPrint(BCLog::NET, "transaction sent in violation of protocol peer=%d\n", pfrom->GetId());
pfrom->fDisconnect = true;
return true;
}

10
test/functional/p2p_blocksonly.py
View file

@ -19,7 +19,7 @@ class P2PBlocksOnly(BitcoinTestFramework):
def run_test(self):
self.nodes[0].add_p2p_connection(P2PInterface())
self.log.info('Check that txs from p2p are rejected')
self.log.info('Check that txs from p2p are rejected and result in disconnect')
prevtx = self.nodes[0].getblock(self.nodes[0].getblockhash(1), 2)['tx'][0]
rawtx = self.nodes[0].createrawtransaction(
inputs=[{
@ -42,13 +42,17 @@ class P2PBlocksOnly(BitcoinTestFramework):
assert_equal(self.nodes[0].getnetworkinfo()['localrelay'], False)
with self.nodes[0].assert_debug_log(['transaction sent in violation of protocol peer=0']):
self.nodes[0].p2p.send_message(msg_tx(FromHex(CTransaction(), sigtx)))
self.nodes[0].p2p.sync_with_ping()
self.nodes[0].p2p.wait_for_disconnect()
assert_equal(self.nodes[0].getmempoolinfo()['size'], 0)
# Remove the disconnected peer and add a new one.
del self.nodes[0].p2ps[0]
self.nodes[0].add_p2p_connection(P2PInterface())
self.log.info('Check that txs from rpc are not rejected and relayed to other peers')
assert_equal(self.nodes[0].getpeerinfo()[0]['relaytxes'], True)
txid = self.nodes[0].testmempoolaccept([sigtx])[0]['txid']
with self.nodes[0].assert_debug_log(['received getdata for: tx {} peer=0'.format(txid)]):
with self.nodes[0].assert_debug_log(['received getdata for: tx {} peer=1'.format(txid)]):
self.nodes[0].sendrawtransaction(sigtx)
self.nodes[0].p2p.wait_for_tx(txid)
assert_equal(self.nodes[0].getmempoolinfo()['size'], 1)