cmd/cli: use wmi to get AD domain

Since using syscall.NetGetJoinInformation won't return the full domain
name.

Discovered while investigating issue with SRV ldap check.

cmd/cli/ad_windows.go

@@ -1,11 +1,13 @@
 package cli
 
 import (
+	"io"
+	"log"
+	"os"
 	"strings"
-	"syscall"
-	"unsafe"
 
-	"golang.org/x/sys/windows"
+	"github.com/microsoft/wmi/pkg/base/host"
+	hh "github.com/microsoft/wmi/pkg/hardware/host"
 
 	"github.com/Control-D-Inc/ctrld"
 )
@@ -50,15 +52,20 @@ func addSplitDnsRule(cfg *ctrld.Config, domain string) bool {
 
 // getActiveDirectoryDomain returns AD domain name of this computer.
 func getActiveDirectoryDomain() (string, error) {
-	var domain *uint16
-	var status uint32
-	err := syscall.NetGetJoinInformation(nil, &domain, &status)
+	log.SetOutput(io.Discard)
+	defer log.SetOutput(os.Stderr)
+	whost := host.NewWmiLocalHost()
+	cs, err := hh.GetComputerSystem(whost)
 	if err != nil {
 		return "", err
 	}
-	defer syscall.NetApiBufferFree((*byte)(unsafe.Pointer(domain)))
-	if status == syscall.NetSetupDomainName {
-		return windows.UTF16PtrToString(domain), nil
+	defer cs.Close()
+	pod, err := cs.GetPropertyPartOfDomain()
+	if err != nil {
+		return "", err
+	}
+	if pod {
+		return cs.GetPropertyDomain()
 	}
 	return "", nil
 }

go.mod

@@ -58,6 +58,7 @@ require (
 	github.com/golang/protobuf v1.5.4 // indirect
 	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/google/pprof v0.0.0-20240409012703-83162a5b38cd // indirect
+	github.com/google/uuid v1.6.0 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/jsimonetti/rtnetlink v1.4.0 // indirect

go.sum

@@ -166,6 +166,8 @@ github.com/google/pprof v0.0.0-20240409012703-83162a5b38cd h1:gbpYu9NMq8jhDVbvlG
 github.com/google/pprof v0.0.0-20240409012703-83162a5b38cd/go.mod h1:kf6iHlnVGwgKolg33glAes7Yg/8iWP8ukqeldJSO7jw=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
 github.com/googleapis/google-cloud-go-testing v0.0.0-20200911160855-bcd43fbb19e8/go.mod h1:dvDLG8qkwmyD9a/MJJN3XJcT3xFxOKAvTZGvuZmac9g=