Better error handling (no panic) for client connrefused

Server logs error w/o exiting if missing hkexsh.passwd file

Signed-off-by: Russ Magee <rmagee@gmail.com>

hkexauth.go

@@ -37,8 +37,7 @@ func AuthUserByPasswd(username string, auth string, fname string) (valid bool, a
 	b, e := ioutil.ReadFile(fname) // nolint: gosec
 	if e != nil {
 		valid = false
-		log.Println("ERROR: Cannot read hkexsh.passwd file!")
-		log.Fatal(e)
+		log.Printf("ERROR: Cannot read %s!\n", fname)
 	}
 	r := csv.NewReader(bytes.NewReader(b))
 

hkexsh/hkexsh.go

@@ -781,7 +781,7 @@ func main() {
 	conn, err := hkexnet.Dial("tcp", server, cipherAlg, hmacAlg, kexAlg)
 	if err != nil {
 		fmt.Println(err)
-		panic(err)
+		os.Exit(3)
 	}
 	defer conn.Close() // nolint: errcheck
 	// From this point on, conn is a secure encrypted channel