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56 lines
1.6 KiB
PowerShell
Executable File
56 lines
1.6 KiB
PowerShell
Executable File
<#
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.SYNOPSIS
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Checks an IPv6 address for validity
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.DESCRIPTION
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This PowerShell script checks the given IPv6 address for validity
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.PARAMETER Address
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Specifies the IPv6 address to check
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.EXAMPLE
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PS> ./check-ipv6-address fe80::200:5aee:feaa:20a2
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✅ IPv6 fe80::200:5aee:feaa:20a2 is valid
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.LINK
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https://github.com/fleschutz/PowerShell
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.NOTES
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Author: Markus Fleschutz | License: CC0
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#>
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param([string]$Address = "")
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function IsIPv6AddressValid { param([string]$IP)
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$IPv4Regex = '(((25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})\.){3}(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2}))'
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$G = '[a-f\d]{1,4}'
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$Tail = @(":",
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"(:($G)?|$IPv4Regex)",
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":($IPv4Regex|$G(:$G)?|)",
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"(:$IPv4Regex|:$G(:$IPv4Regex|(:$G){0,2})|:)",
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"((:$G){0,2}(:$IPv4Regex|(:$G){1,2})|:)",
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"((:$G){0,3}(:$IPv4Regex|(:$G){1,2})|:)",
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"((:$G){0,4}(:$IPv4Regex|(:$G){1,2})|:)")
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[string] $IPv6RegexString = $G
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$Tail | foreach { $IPv6RegexString = "${G}:($IPv6RegexString|$_)" }
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$IPv6RegexString = ":(:$G){0,5}((:$G){1,2}|:$IPv4Regex)|$IPv6RegexString"
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$IPv6RegexString = $IPv6RegexString -replace '\(' , '(?:' # make all groups non-capturing
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[regex] $IPv6Regex = $IPv6RegexString
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if ($IP -imatch "^$IPv6Regex$") {
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return $true
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} else {
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return $false
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}
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}
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try {
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if ($Address -eq "" ) {
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$Address = read-host "Enter IPv6 address to validate"
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}
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if (IsIPv6AddressValid $Address) {
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"✅ IPv6 $Address is valid"
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exit 0 # success
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} else {
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write-warning "Invalid IPv6 address: $Address"
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exit 1
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}
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} catch {
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"⚠️ Error in line $($_.InvocationInfo.ScriptLineNumber): $($Error[0])"
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exit 1
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}
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