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light: add canonical header verification to GetTransaction

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This commit is contained in:
Zsolt Felfoldi 2019-05-08 16:11:21 +02:00
parent 47da5b8886
commit ee1cb0cba0
1 changed files with 5 additions and 0 deletions
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5
light/odr_util.go
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@ -236,6 +236,11 @@ func GetTransaction(ctx context.Context, odr OdrBackend, txHash common.Hash) (*t
return nil, common.Hash{}, 0, 0, err
} else {
pos := r.Status[0].Lookup
// first ensure that we have the header, otherwise block body retrieval will fail
// also verify if this is a canonical block by getting the header by number and checking its hash
if header, err := GetHeaderByNumber(ctx, odr, pos.BlockIndex); err != nil || header.Hash() != pos.BlockHash {
return nil, common.Hash{}, 0, 0, err
}
if body, err := GetBody(ctx, odr, pos.BlockHash, pos.BlockIndex); err != nil || uint64(len(body.Transactions)) <= pos.Index || body.Transactions[pos.Index].Hash() != txHash {
return nil, common.Hash{}, 0, 0, err
} else {