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Claire 2026-01-07 14:14:42 +01:00 • committed by GitHub
parent a846ed17ff
commit 71ae4cf2cf
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2 changed files with 27 additions and 4 deletions
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11
app/lib/private_address_check.rb
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@ -1,9 +1,7 @@
# frozen_string_literal: true
module PrivateAddressCheck
module_function
CIDR_LIST = [
IP4_CIDR_LIST = [
IPAddr.new('0.0.0.0/8'), # Current network (only valid as source address)
IPAddr.new('100.64.0.0/10'), # Shared Address Space
IPAddr.new('172.16.0.0/12'), # Private network
@ -16,6 +14,9 @@ module PrivateAddressCheck
IPAddr.new('224.0.0.0/4'), # IP multicast (former Class D network)
IPAddr.new('240.0.0.0/4'), # Reserved (former Class E network)
IPAddr.new('255.255.255.255'), # Broadcast
].freeze
CIDR_LIST = (IP4_CIDR_LIST + IP4_CIDR_LIST.map(&:ipv4_mapped) + [
IPAddr.new('64:ff9b::/96'), # IPv4/IPv6 translation (RFC 6052)
IPAddr.new('100::/64'), # Discard prefix (RFC 6666)
IPAddr.new('2001::/32'), # Teredo tunneling
@ -25,7 +26,9 @@ module PrivateAddressCheck
IPAddr.new('2002::/16'), # 6to4
IPAddr.new('fc00::/7'), # Unique local address
IPAddr.new('ff00::/8'), # Multicast
].freeze
]).freeze
module_function
def private_address?(address)
address.private? || address.loopback? || address.link_local? || CIDR_LIST.any? { |cidr| cidr.include?(address) }