| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package l2topology |
| 4 | |
| 5 | import ( |
| 6 | "encoding/hex" |
| 7 | "strings" |
| 8 | ) |
| 9 | |
| 10 | func normalizeLLDPPortIDForMatch(portID, subtype string) string { |
| 11 | portID = strings.TrimSpace(portID) |
| 12 | if portID == "" { |
| 13 | return "" |
| 14 | } |
| 15 | |
| 16 | switch normalizeLLDPPortSubtypeForMatch(subtype) { |
| 17 | case "mac": |
| 18 | if mac := canonicalLLDPMACToken(portID); mac != "" { |
| 19 | return mac |
| 20 | } |
| 21 | case "network": |
| 22 | if ip := canonicalIP(portID); ip != "" { |
| 23 | return ip |
| 24 | } |
| 25 | } |
| 26 | |
| 27 | return portID |
| 28 | } |
| 29 | |
| 30 | func normalizeLLDPPortSubtypeForMatch(subtype string) string { |
| 31 | switch strings.ToLower(strings.TrimSpace(subtype)) { |
| 32 | case "3", "macaddress": |
| 33 | return "mac" |
| 34 | case "4", "networkaddress": |
| 35 | return "network" |
| 36 | default: |
| 37 | return strings.ToLower(strings.TrimSpace(subtype)) |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | func normalizeLLDPChassisForMatch(v string) string { |
| 42 | v = strings.TrimSpace(v) |
| 43 | if v == "" { |
| 44 | return "" |
| 45 | } |
| 46 | if ip := canonicalIP(v); ip != "" { |
| 47 | return ip |
| 48 | } |
| 49 | if mac := canonicalLLDPMACToken(v); mac != "" { |
| 50 | return mac |
| 51 | } |
| 52 | return v |
| 53 | } |
| 54 | |
| 55 | func canonicalLLDPMACToken(v string) string { |
| 56 | v = strings.TrimSpace(strings.ToLower(v)) |
| 57 | if v == "" { |
| 58 | return "" |
| 59 | } |
| 60 | |
| 61 | clean := strings.TrimPrefix(v, "0x") |
| 62 | clean = strings.NewReplacer(":", "", "-", "", ".", "", " ", "").Replace(clean) |
| 63 | if len(clean) != 12 { |
| 64 | return "" |
| 65 | } |
| 66 | if _, err := hex.DecodeString(clean); err != nil { |
| 67 | return "" |
| 68 | } |
| 69 | return clean |
| 70 | } |