36 lines
759 B
Go
36 lines
759 B
Go
package utils
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import (
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"net"
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log "github.com/sirupsen/logrus"
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)
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// IsHostnameInternal will attempt to determine if the hostname is internal to
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// this server's network or is the loopback address.
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func IsHostnameInternal(hostname string) bool {
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// If this is already an IP address don't try to resolve it
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if ip := net.ParseIP(hostname); ip != nil {
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return isIPAddressInternal(ip)
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}
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ips, err := net.LookupIP(hostname)
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if err != nil {
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// Default to false if we can't resolve the hostname.
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log.Debugln("Unable to resolve hostname:", hostname)
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return false
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}
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for _, ip := range ips {
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if isIPAddressInternal(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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func isIPAddressInternal(ip net.IP) bool {
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return ip.IsLoopback() || ip.IsPrivate()
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}
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