73 lines
1.4 KiB
Go
73 lines
1.4 KiB
Go
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package home
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import "net"
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// ipDetector describes IP address properties.
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type ipDetector struct {
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nets []*net.IPNet
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}
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// newIPDetector returns a new IP detector.
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func newIPDetector() (ipd *ipDetector, err error) {
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specialNetworks := []string{
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"0.0.0.0/8",
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"10.0.0.0/8",
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"100.64.0.0/10",
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"127.0.0.0/8",
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"169.254.0.0/16",
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"172.16.0.0/12",
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"192.0.0.0/24",
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"192.0.0.0/29",
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"192.0.2.0/24",
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"192.88.99.0/24",
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"192.168.0.0/16",
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"198.18.0.0/15",
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"198.51.100.0/24",
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"203.0.113.0/24",
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"240.0.0.0/4",
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"255.255.255.255/32",
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"::1/128",
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"::/128",
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"64:ff9b::/96",
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// Since this network is used for mapping IPv4 addresses, we
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// don't include it.
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// "::ffff:0:0/96",
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"100::/64",
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"2001::/23",
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"2001::/32",
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"2001:2::/48",
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"2001:db8::/32",
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"2001:10::/28",
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"2002::/16",
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"fc00::/7",
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"fe80::/10",
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}
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ipd = &ipDetector{
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nets: make([]*net.IPNet, len(specialNetworks)),
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}
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for i, ipnetStr := range specialNetworks {
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_, ipnet, err := net.ParseCIDR(ipnetStr)
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if err != nil {
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return nil, err
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}
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ipd.nets[i] = ipnet
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}
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return ipd, nil
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}
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// detectSpecialNetwork returns true if IP address is contained by any of
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// special-purpose IP address registries according to RFC-6890
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// (https://tools.ietf.org/html/rfc6890).
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func (ipd *ipDetector) detectSpecialNetwork(ip net.IP) bool {
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for _, ipnet := range ipd.nets {
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if ipnet.Contains(ip) {
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return true
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}
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}
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return false
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}
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