CODEWITHSUNDEEP
gofqdn
Kevin Bailey
Kevin Bailey

Reputation: 59

How do you find the FQDN of the local host?

How do you find the FQDN of the local host in Go?

BTW: net.LookupAddr() doesn't work on Windows. So that's not an option.

Upvotes: 4

Views: 11892

Answers (3)

Medhi Bechina
Medhi Bechina

Reputation: 69

By default there is no short way.

os.Hostname() doesn't provide the Fully Qualified Domain Name by default.

cmd := exec.Command("/bin/hostname", "-f")
var out bytes.Buffer
cmd.Stdout = &out
err := cmd.Run()
if err != nil {
    log.Errorf(err)
}
fqdn := out.String()
fqdn = fqdn[:len(fqdn)-1] // removing EOL

Upvotes: 5

Enrico Bianchi
Enrico Bianchi

Reputation: 2011

According to the documentation, function os.Hostname() returns the system host name reported by kernel. So, if your computer is named computer1, os.Hostname() returns computer1. If your computer is named computer1.my.office, os.Hostname() returns computer1.my.office. On Windows, is the same. If you want the domain name (as referred to the Active Directory domain) you have four ways:

  1. Parse the result of this command: wmic computersystem get domain
  2. Parse the result of this command: systeminfo | findstr /B /C:"Domain"
  3. Assume the existence of the environment variable USERDNSDOMAIN and evaluate his value (note that: the value of this variable is referred at the domain which user is stored)
  4. Check if one of the ip's assigned to the workstation can be resolved via DNS (for this point, you can view this: https://github.com/Showmax/go-fqdn)

Upvotes: 3

quikchange
quikchange

Reputation: 554

You can perform some gymnastics using the net lib as demonstrated here.

Upvotes: 1

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