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// +build linux
package main
import (
"fmt"
"os"
"syscall"
)
// scutil --get ComputerName
// getDomainName fetches the domain name using the getdomainname syscall.
func getDomainName() (string, error) {
var buf [256]byte
err := syscall.Getdomainname(buf[:])
if err != nil {
return "", fmt.Errorf("failed to get domain name: %w", err)
}
// Trim null bytes
n := 0
for ; n < len(buf); n++ {
if buf[n] == 0 {
break
}
}
return string(buf[:n]), nil
}
// GetFullHostname returns the hostname + domain name (if set).
func GetFullHostname() (string, error) {
host, err := os.Hostname()
if err != nil {
return "", fmt.Errorf("failed to get hostname: %w", err)
}
domain, err := getDomainName()
if err != nil || domain == "" {
return host, nil // fallback to short hostname
}
return fmt.Sprintf("%s.%s", host, domain), nil
}
func main() {
fqdn, err := GetFullHostname()
if err != nil {
fmt.Println("Error:", err)
return
}
fmt.Println("Hostname + Domain:", fqdn)
}
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