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Golang get local IP
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package network | |
import ( | |
"errors" | |
"net" | |
) | |
// LocalIP get the host machine local IP address | |
func LocalIP() (net.IP, error) { | |
ifaces, err := net.Interfaces() | |
if err != nil { | |
return nil, err | |
} | |
for _, i := range ifaces { | |
addrs, err := i.Addrs() | |
if err != nil { | |
return nil, err | |
} | |
for _, addr := range addrs { | |
var ip net.IP | |
switch v := addr.(type) { | |
case *net.IPNet: | |
ip = v.IP | |
case *net.IPAddr: | |
ip = v.IP | |
} | |
if isPrivateIP(ip) { | |
return ip, nil | |
} | |
} | |
} | |
return nil, errors.New("no IP") | |
} | |
func isPrivateIP(ip net.IP) bool { | |
var privateIPBlocks []*net.IPNet | |
for _, cidr := range []string{ | |
// don't check loopback ips | |
//"127.0.0.0/8", // IPv4 loopback | |
//"::1/128", // IPv6 loopback | |
//"fe80::/10", // IPv6 link-local | |
"10.0.0.0/8", // RFC1918 | |
"172.16.0.0/12", // RFC1918 | |
"192.168.0.0/16", // RFC1918 | |
} { | |
_, block, _ := net.ParseCIDR(cidr) | |
privateIPBlocks = append(privateIPBlocks, block) | |
} | |
for _, block := range privateIPBlocks { | |
if block.Contains(ip) { | |
return true | |
} | |
} | |
return false | |
} |
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