From b39042db5672e830ddec41ea97c642d93be61c30 Mon Sep 17 00:00:00 2001
From: Jeffrey Wilcke <geffobscura@gmail.com>
Date: Mon, 29 Jun 2015 12:42:47 +0200
Subject: core, miner: implemented canary
---
core/canary.go | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
create mode 100644 core/canary.go
(limited to 'core')
diff --git a/core/canary.go b/core/canary.go
new file mode 100644
index 000000000..de77c4bba
--- /dev/null
+++ b/core/canary.go
@@ -0,0 +1,28 @@
+package core
+
+import (
+ "math/big"
+
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/core/state"
+)
+
+var (
+ jeff = common.HexToAddress("9d38997c624a71b21278389ea2fdc460d000e4b2")
+ vitalik = common.HexToAddress("b1e570be07eaa673e4fd0c8265b64ef739385709")
+ christoph = common.HexToAddress("529bc43a5d93789fa28de1961db6a07e752204ae")
+ gav = common.HexToAddress("e3e942b2aa524293c84ff6c7f87a6635790ad5e4")
+)
+
+// Canary will check the 0'd address of the 4 contracts above.
+// If two or more are set to anything other than a 0 the canary
+// dies a horrible death.
+func Canary(statedb *state.StateDB) bool {
+ r := new(big.Int)
+ r.Add(r, statedb.GetState(jeff, common.Hash{}).Big())
+ r.Add(r, statedb.GetState(vitalik, common.Hash{}).Big())
+ r.Add(r, statedb.GetState(christoph, common.Hash{}).Big())
+ r.Add(r, statedb.GetState(gav, common.Hash{}).Big())
+
+ return r.Cmp(big.NewInt(1)) > 0
+}
--
cgit v1.2.3