owncast/utils/netutils.go

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