From 8ff8d219c3d9a0b6f604bb99ca4a27ad77cdb69b Mon Sep 17 00:00:00 2001 From: Gregory Maxwell Date: Fri, 20 Jan 2017 02:38:12 +0000 Subject: [PATCH] Send final alert message to older peers after connecting. The old Bitcoin alert system has long since been retired. ( See also: https://bitcoin.org/en/alert/2016-11-01-alert-retirement ) This change causes each node to send any old peers that it connects with a copy of the final alert. The alert it hardcode cancels all other alerts including other final alerts. --- src/net_processing.cpp | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/net_processing.cpp b/src/net_processing.cpp index 36a525763..e49333ed2 100644 --- a/src/net_processing.cpp +++ b/src/net_processing.cpp @@ -1324,6 +1324,12 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv, pfrom->nTimeOffset = nTimeOffset; AddTimeData(pfrom->addr, nTimeOffset); + // If the peer is old enough to have the old alert system, send it the final alert. + if (pfrom->nVersion <= 70012) { + CDataStream finalAlert(ParseHex("60010000000000000000000000ffffff7f00000000ffffff7ffeffff7f01ffffff7f00000000ffffff7f00ffffff7f002f555247454e543a20416c657274206b657920636f6d70726f6d697365642c2075706772616465207265717569726564004630440220653febd6410f470f6bae11cad19c48413becb1ac2c17f908fd0fd53bdc3abd5202206d0e9c96fe88d4a0f01ed9dedae2b6f9e00da94cad0fecaae66ecf689bf71b50"), SER_NETWORK, PROTOCOL_VERSION); + connman.PushMessage(pfrom, CNetMsgMaker(nSendVersion).Make("alert", finalAlert)); + } + // Feeler connections exist only to verify if address is online. if (pfrom->fFeeler) { assert(pfrom->fInbound == false);