neoneo-go/pkg/network/payload/getblockbyindex.go

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package payload
import (
network: do not allow to request invalid block count The problem is in peer disconnection due to invalid GetBlockByIndex payload (the logs are from some patched neo-go version): ``` дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.490Z INFO new peer connected {"addr": "10.78.69.115:50846", "peerCount": 3} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.490Z WARN peer disconnected {"addr": "10.78.69.115:50846", "error": "invalid block count", "peerCount": 2} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.490Z INFO started protocol {"addr": "10.78.69.115:50846", "userAgent": "/NEO-GO:1.0.0/", "startHeight": 0, "id": 1339571820} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.491Z INFO new peer connected {"addr": "10.78.69.115:50856", "peerCount": 3} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.492Z WARN peer disconnected {"addr": "10.78.69.115:50856", "error": "invalid block count", "peerCount": 2} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.492Z INFO started protocol {"addr": "10.78.69.115:50856", "userAgent": "/NEO-GO:1.0.0/", "startHeight": 0, "id": 1339571820} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.492Z INFO new peer connected {"addr": "10.78.69.115:50858", "peerCount": 3} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.493Z INFO started protocol {"addr": "10.78.69.115:50858", "userAgent": "/NEO-GO:1.0.0/", "startHeight": 0, "id": 1339571820} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.493Z WARN peer disconnected {"addr": "10.78.69.115:50858", "error": "invalid block count", "peerCount": 2} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.494Z INFO new peer connected {"addr": "10.78.69.115:50874", "peerCount": 3} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.494Z INFO started protocol {"addr": "10.78.69.115:50874", "userAgent": "/NEO-GO:1.0.0/", "startHeight": 0, "id": 1339571820} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.494Z WARN peer disconnected {"addr": "10.78.69.115:50874", "error": "invalid block count", "peerCount": 2} ``` GetBlockByIndex payload can't be decoded, and the only possible cause is zero (or <-1, but it's probably not the case) block count requested. Error is improved as far.
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"fmt"
"github.com/nspcc-dev/neo-go/pkg/io"
)
// GetBlockByIndex payload.
type GetBlockByIndex struct {
IndexStart uint32
Count int16
}
// NewGetBlockByIndex returns GetBlockByIndex payload with the specified start index and count.
func NewGetBlockByIndex(indexStart uint32, count int16) *GetBlockByIndex {
return &GetBlockByIndex{
IndexStart: indexStart,
Count: count,
}
}
// DecodeBinary implements the Serializable interface.
func (d *GetBlockByIndex) DecodeBinary(br *io.BinReader) {
d.IndexStart = br.ReadU32LE()
d.Count = int16(br.ReadU16LE())
if d.Count < -1 || d.Count == 0 || d.Count > MaxHeadersAllowed {
network: do not allow to request invalid block count The problem is in peer disconnection due to invalid GetBlockByIndex payload (the logs are from some patched neo-go version): ``` дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.490Z INFO new peer connected {"addr": "10.78.69.115:50846", "peerCount": 3} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.490Z WARN peer disconnected {"addr": "10.78.69.115:50846", "error": "invalid block count", "peerCount": 2} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.490Z INFO started protocol {"addr": "10.78.69.115:50846", "userAgent": "/NEO-GO:1.0.0/", "startHeight": 0, "id": 1339571820} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.491Z INFO new peer connected {"addr": "10.78.69.115:50856", "peerCount": 3} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.492Z WARN peer disconnected {"addr": "10.78.69.115:50856", "error": "invalid block count", "peerCount": 2} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.492Z INFO started protocol {"addr": "10.78.69.115:50856", "userAgent": "/NEO-GO:1.0.0/", "startHeight": 0, "id": 1339571820} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.492Z INFO new peer connected {"addr": "10.78.69.115:50858", "peerCount": 3} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.493Z INFO started protocol {"addr": "10.78.69.115:50858", "userAgent": "/NEO-GO:1.0.0/", "startHeight": 0, "id": 1339571820} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.493Z WARN peer disconnected {"addr": "10.78.69.115:50858", "error": "invalid block count", "peerCount": 2} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.494Z INFO new peer connected {"addr": "10.78.69.115:50874", "peerCount": 3} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.494Z INFO started protocol {"addr": "10.78.69.115:50874", "userAgent": "/NEO-GO:1.0.0/", "startHeight": 0, "id": 1339571820} дек 15 16:02:39 glagoli neo-go[928530]: 2022-12-15T16:02:39.494Z WARN peer disconnected {"addr": "10.78.69.115:50874", "error": "invalid block count", "peerCount": 2} ``` GetBlockByIndex payload can't be decoded, and the only possible cause is zero (or <-1, but it's probably not the case) block count requested. Error is improved as far.
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br.Err = fmt.Errorf("invalid block count: %d", d.Count)
}
}
// EncodeBinary implements the Serializable interface.
func (d *GetBlockByIndex) EncodeBinary(bw *io.BinWriter) {
bw.WriteU32LE(d.IndexStart)
bw.WriteU16LE(uint16(d.Count))
}