(ip: string | undefined)
| 41 | // unspecified and link-local addresses (no useful reverse record); everything |
| 42 | // else — private LAN or public, IPv4 or IPv6 — is allowed. |
| 43 | export function isResolvableIP(ip: string | undefined): boolean { |
| 44 | if (!ip) return false |
| 45 | |
| 46 | if (ip.includes(':')) { |
| 47 | const lower = ip.split('%')[0]!.toLowerCase() |
| 48 | if (lower === '::' || lower === '::1') return false |
| 49 | if (/^fe[89ab]/.test(lower)) return false // fe80::/10 link-local |
| 50 | return true |
| 51 | } |
| 52 | |
| 53 | const parts = ip.split('.') |
| 54 | if (parts.length !== 4) return false |
| 55 | for (const part of parts) { |
| 56 | if (!/^\d{1,3}$/.test(part) || Number(part) > 255) return false |
| 57 | } |
| 58 | const a = Number(parts[0]) |
| 59 | const b = Number(parts[1]) |
| 60 | if (a === 127 || a === 0) return false // loopback / unspecified |
| 61 | if (a === 169 && b === 254) return false // 169.254.0.0/16 link-local |
| 62 | return true |
| 63 | } |
| 64 | |
| 65 | // 192.168.50.62 -> 62.50.168.192.in-addr.arpa |
| 66 | function reverseNameV4(ip: string): string | null { |
no outgoing calls
no test coverage detected