33 lines
687 B
Go
33 lines
687 B
Go
package netutil
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import (
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"net"
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"strings"
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)
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func IsLocalOrPrivateHost(host string) bool {
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host = strings.ToLower(strings.TrimSpace(host))
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if host == "" {
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return false
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}
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if host == "localhost" || strings.HasSuffix(host, ".localhost") || host == "host.docker.internal" {
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return true
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}
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ip := net.ParseIP(host)
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return ip != nil && IsLocalOrPrivateIP(ip)
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}
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func IsLocalOrPrivateIP(ip net.IP) bool {
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if ip == nil {
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return false
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}
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if ip.IsLoopback() || ip.IsPrivate() || ip.IsUnspecified() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
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return true
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}
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ip4 := ip.To4()
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if ip4 == nil {
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return false
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}
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return ip4[0] == 100 && ip4[1] >= 64 && ip4[1] <= 127
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}
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