TrueCloudLab/neoneo-go
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network: do not allow to request invalid block count

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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.
This commit is contained in:
Anna Shaleva 2022-12-15 20:10:09 +03:00
parent c0a453a53b
commit 9b364aa7ee
4 changed files with 29 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

4
pkg/network/payload/getblockbyindex.go
View file

@ -1,7 +1,7 @@
package payload
import (
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/io"
)
@ -25,7 +25,7 @@ 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 {
br.Err = errors.New("invalid block count")
br.Err = fmt.Errorf("invalid block count: %d", d.Count)
}
}