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