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Get Block message: BlockTransferReadBlock validate limit. Fix in startBlockTransfer. New high-level function BlockDownload to download requested blocks.

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Kleissner
2021-12-11 12:59:50 +01:00
parent b65f53611a
commit d2bde58d4b
2 changed files with 49 additions and 2 deletions
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8
protocol/Message Encoding Get Block.go
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@@ -29,6 +29,8 @@ Offset Size Info
2 = Block range exceeds size limit.
1 16 Block range
17 8 Block size
The limit in block range must be 1 if a block is returned.
*/
package protocol
@@ -197,12 +199,16 @@ func BlockTransferReadBlock(reader io.Reader, maxBlockSize uint64) (data []byte,
targetBlock.Limit = binary.LittleEndian.Uint64(header[9:17])
blockSize = binary.LittleEndian.Uint64(header[17:25])
if availability != GetBlockStatusAvailable { // return if status isn't available
if targetBlock.Limit == 0 {
return nil, targetBlock, blockSize, availability, errors.New("empty target block limit")
} else if availability != GetBlockStatusAvailable { // return if status indicates the block is not available
return nil, targetBlock, blockSize, availability, nil
}
if blockSize > maxBlockSize {
return nil, targetBlock, blockSize, availability, errors.New("remote block size exceeds limit")
} else if targetBlock.Limit != 1 {
return nil, targetBlock, blockSize, availability, errors.New("invalid target block limit")
}
// read the block