Benson Wong
32 lines
689 B
Go
32 lines
689 B
Go
package shared
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import "net"
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// IsLoopbackAddr reports whether listenAddr binds exclusively to loopback.
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// Addresses with an empty or wildcard host (e.g. ":8080", "0.0.0.0:8080",
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// "[::]:8080") bind on all interfaces and return false.
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func IsLoopbackAddr(listenAddr string) bool {
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host, _, err := net.SplitHostPort(listenAddr)
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if err != nil {
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return false
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}
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if host == "" {
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return false
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}
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ip := net.ParseIP(host)
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if ip != nil {
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return ip.IsLoopback()
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}
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// hostname case (e.g. "localhost")
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addrs, err := net.LookupHost(host)
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if err != nil {
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return false
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}
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for _, a := range addrs {
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if !net.ParseIP(a).IsLoopback() {
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return false
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}
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}
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return len(addrs) > 0
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}
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