61 lines
1.1 KiB
Go
61 lines
1.1 KiB
Go
package server
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import (
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"net"
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"github.com/pkg/errors"
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"github.com/wlynxg/anet"
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)
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var (
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_, lanA, _ = net.ParseCIDR("10.0.0.0/8")
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_, lanB, _ = net.ParseCIDR("172.16.0.0/12")
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_, lanC, _ = net.ParseCIDR("192.168.0.0/16")
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)
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func getLANIPv4Addrs() ([]string, error) {
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ips := make([]string, 0)
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addrs, err := anet.InterfaceAddrs()
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if err != nil {
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return nil, errors.WithStack(err)
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}
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for _, address := range addrs {
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if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
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ipv4 := ipnet.IP.To4()
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if ipv4 == nil {
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continue
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}
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isLAN := lanA.Contains(ipv4) || lanB.Contains(ipv4) || lanC.Contains(ipv4)
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if !isLAN {
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continue
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}
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ips = append(ips, ipv4.String())
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}
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}
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return ips, nil
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}
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func FindPreferredLocalAddress(ips ...net.IP) (string, error) {
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localAddrs, err := anet.InterfaceAddrs()
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if err != nil {
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return "", errors.WithStack(err)
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}
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for _, addr := range localAddrs {
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if ipnet, ok := addr.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
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for _, ip := range ips {
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if ipnet.Contains(ip) {
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return ip.String(), nil
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}
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}
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}
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}
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return ips[0].String(), nil
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}
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