Reject block versions lower than 4

Closes #1556
2016-10-20 15:26:34 -05:00
parent 7ac924cdb7
commit 80f4cdcf8f
4 changed files with 39 additions and 0 deletions
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2940,6 +2940,11 @@ bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos, unsigne

 bool CheckBlockHeader(const CBlockHeader& block, CValidationState& state, bool fCheckPOW)
 {
+    // Check block version
+    if (block.nVersion < MIN_BLOCK_VERSION)
+        return state.DoS(100, error("CheckBlockHeader(): block version too low"),
+                         REJECT_INVALID, "version-too-low");
+
    // Check Equihash solution is valid
    if (fCheckPOW && !CheckEquihashSolution(&block, Params()))
        return state.DoS(100, error("CheckBlockHeader(): Equihash solution invalid"),