Certdump handles DER certificates as well now.

cmd/certdump/certdump.go

@@ -184,10 +184,13 @@ func displayCert(cert *x509.Certificate) {
 
 func displayAllCerts(in []byte, leafOnly bool) {
 	certs, err := helpers.ParseCertificatesPEM(in)
+	if err != nil {
+		certs, _, err = helpers.ParseCertificatesDER(in, "")
 		if err != nil {
 			Warn(TranslateCFSSLError(err), "failed to parse certificates")
 			return
 		}
+	}
 
 	if len(certs) == 0 {
 		Warnx("no certificates found")

lib/defs.go

@@ -4,6 +4,8 @@ package lib
 
 const (
 	// ExitSuccess is the successful exit status.
+	//
+	// It should be called on successful exit.
 	ExitSuccess = 0
 
 	// ExitFailure is the failing exit status.

lib/lib.go

@@ -11,6 +11,8 @@ var progname = filepath.Base(os.Args[0])
 
 // ProgName returns what lib thinks the program name is, namely the
 // basename of of argv0.
+//
+// It is similar to the Linux __progname.
 func ProgName() string {
 	return progname
 }