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scrutiny/collector/pkg/detect/wwn.go

60 lines
1.9 KiB

package detect
import (
"fmt"
"strings"
)
type Wwn struct {
Naa uint64 `json:"naa"`
Oui uint64 `json:"oui"`
Id uint64 `json:"id"`
VendorCode string `json:"vendor_code"`
}
// this is an incredibly basic converter, that only works for "Registered" IEEE format - NAA5
// https://standards.ieee.org/content/dam/ieee-standards/standards/web/documents/tutorials/fibre.pdf
// references:
// - https://metacpan.org/pod/Device::WWN
// - https://en.wikipedia.org/wiki/World_Wide_Name
// - https://storagemeat.blogspot.com/2012/08/decoding-wwids-or-how-to-tell-whats-what.html
// - https://bryanchain.com/2016/01/20/breaking-down-an-naa-id-world-wide-name/
/*
+----------+---+---+---+---+---+---+---+---+
| Byte/Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
+----------+---+---+---+---+---+---+---+---+
| 0 | NAA (5h) | (MSB) |
+----------+---------------+ +
| 1 | |
+----------+ IEEE OUI |
| 2 | |
+----------+ +---------------+
| 3 | (LSB) | (MSB) |
+----------+---------------+ +
| 4 | |
| | |
+----------+ |
| 5 | Vendor ID |
+----------+ |
| 6 | |
+----------+ |
| 7 | (LSB) |
+----------+-------------------------------+
*/
func (wwn *Wwn) ToString() string {
var wwnBuffer uint64
wwnBuffer = wwn.Id //start with vendor ID
wwnBuffer += (wwn.Oui << 36) //add left-shifted OUI
wwnBuffer += (wwn.Naa << 60) //NAA is a number from 1-6, so decimal == hex.
//TODO: may need to support additional versions in the future.
return strings.ToLower(fmt.Sprintf("%#x", wwnBuffer))
}