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Fix FuzzRPCClientPartialLength test (MSSQL Server) #25658

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merged 1 commit into from
May 15, 2023
Merged

Fix FuzzRPCClientPartialLength test (MSSQL Server) #25658

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17 changes: 14 additions & 3 deletions lib/srv/db/sqlserver/protocol/fixtures/packets.go
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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,8 @@ var (
// partially Length-prefixed Bytes request, as described here: https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-tds/3f983fde-0509-485a-8c40-a9fa6679a828
func RPCClientPartiallyLength(length uint64, chunks uint64) []byte {
packet := []byte{
0x03, 0x01, 0x00, 0x00, // Length placeholder
0x03, 0x01,
0x00, 0x00, // Length placeholder
0x00, 0x00, 0x01, 0x00, 0x16, 0x00, 0x00, 0x00,
0x12, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
Expand All @@ -104,22 +105,32 @@ func RPCClientPartiallyLength(length uint64, chunks uint64) []byte {
0x00, 0x00, 0x00, 0x00, 0x00, // NVARCHARTYPE flags
}

// NVARCHARTYPE must have even length
if length%2 != 0 {
length += 1
}

packet = binary.LittleEndian.AppendUint64(packet, length)

if length > 0 && chunks > 1 {
chunkSize := length / chunks
rem := length
for rem > 0 {
for i := uint64(0); i < chunks-1; i++ {
packet = binary.LittleEndian.AppendUint32(packet, uint32(chunkSize))
data := make([]byte, chunkSize)
packet = append(packet, data...)
rem -= chunkSize
}

// Last chunk will contain the remaining data.
packet = binary.LittleEndian.AppendUint32(packet, uint32(rem))
data := make([]byte, rem)
packet = append(packet, data...)
}

// PLP_TERMINATOR
packet = append(packet, []byte{0x00, 0x00, 0x00, 0x00}...)

packet[3] = byte(len(packet))
binary.BigEndian.PutUint16(packet[2:], uint16(len(packet)))
return packet
}