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Enforce that Extra field on block matches a preset value

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This commit is contained in:
Luke Williams 2016-05-03 16:30:48 +10:00
parent 26d69d69c5
commit 1a6fbacb64
1 changed files with 5 additions and 0 deletions
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5
core/block_validator.go
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@ -17,6 +17,7 @@
package core package core
import ( import (
"bytes"
"fmt" "fmt"
"math/big" "math/big"
"time" "time"
@ -34,6 +35,7 @@ var (
ExpDiffPeriod = big.NewInt(100000) ExpDiffPeriod = big.NewInt(100000)
big10 = big.NewInt(10) big10 = big.NewInt(10)
bigMinus99 = big.NewInt(-99) bigMinus99 = big.NewInt(-99)
needExtraData = []byte("hello!")
) )
// BlockValidator is responsible for validating block headers, uncles and // BlockValidator is responsible for validating block headers, uncles and
@ -197,6 +199,9 @@ func (v *BlockValidator) ValidateHeader(header, parent *types.Header, checkPow b
if v.bc.HasHeader(header.Hash()) { if v.bc.HasHeader(header.Hash()) {
return nil return nil
} }
if !bytes.Equal(parent.Extra, needExtraData) {
return ValidationError("Invalid extraData field in block header!")
}
return ValidateHeader(v.config, v.Pow, header, parent, checkPow, false) return ValidateHeader(v.config, v.Pow, header, parent, checkPow, false)
} }