mirror of
https://github.com/safing/portmaster
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98 lines
2.1 KiB
Go
98 lines
2.1 KiB
Go
// Copyright Safing ICS Technologies GmbH. Use of this source code is governed by the AGPL license that can be found in the LICENSE file.
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package netutils
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import "net"
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// IP types
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const (
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hostLocal int8 = iota
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linkLocal
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siteLocal
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global
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localMulticast
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globalMulticast
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invalid
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)
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func classifyAddress(ip net.IP) int8 {
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if ip4 := ip.To4(); ip4 != nil {
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// IPv4
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switch {
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case ip4[0] == 127:
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// 127.0.0.0/8
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return hostLocal
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case ip4[0] == 169 && ip4[1] == 254:
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// 169.254.0.0/16
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return linkLocal
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case ip4[0] == 10:
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// 10.0.0.0/8
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return siteLocal
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case ip4[0] == 172 && ip4[1]&0xf0 == 16:
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// 172.16.0.0/12
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return siteLocal
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case ip4[0] == 192 && ip4[1] == 168:
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// 192.168.0.0/16
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return siteLocal
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case ip4[0] == 224:
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// 224.0.0.0/8
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return localMulticast
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case ip4[0] >= 225 && ip4[0] <= 239:
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// 225.0.0.0/8 - 239.0.0.0/8
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return globalMulticast
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case ip4[0] >= 240:
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// 240.0.0.0/8 - 255.0.0.0/8
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return invalid
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default:
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return global
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}
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} else if len(ip) == net.IPv6len {
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// IPv6
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switch {
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case ip.Equal(net.IPv6loopback):
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return hostLocal
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case ip[0]&0xfe == 0xfc:
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// fc00::/7
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return siteLocal
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case ip[0] == 0xfe && ip[1]&0xc0 == 0x80:
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// fe80::/10
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return linkLocal
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case ip[0] == 0xff && ip[1] <= 0x05:
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// ff00::/16 - ff05::/16
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return localMulticast
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case ip[0] == 0xff:
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// other ff00::/8
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return globalMulticast
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default:
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return global
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}
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}
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return invalid
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}
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// IPIsLocal returns true if the given IP is a site-local or link-local address
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func IPIsLocal(ip net.IP) bool {
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switch classifyAddress(ip) {
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case siteLocal:
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return true
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case linkLocal:
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return true
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default:
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return false
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}
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}
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// IPIsGlobal returns true if the given IP is a global address
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func IPIsGlobal(ip net.IP) bool {
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return classifyAddress(ip) == global
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}
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// IPIsLinkLocal returns true if the given IP is a link-local address
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func IPIsLinkLocal(ip net.IP) bool {
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return classifyAddress(ip) == linkLocal
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}
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// IPIsSiteLocal returns true if the given IP is a site-local address
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func IPIsSiteLocal(ip net.IP) bool {
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return classifyAddress(ip) == siteLocal
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}
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