Validate host/target fields (hostname or IP; host allows */** wildcards)

Backend (utils/hostname_validate.js, enforced in routes/host.js on create/update):
- host: IPv4 or a wildcard pattern whose labels may be normal, "*" (one
  fragment) or "**" (any depth, incl. a bare "**" catch-all) — matching
  Host.lookUp. Lowered Host.host min length to 1 so "**"/"*" pass the model.
- target (ip): IPv4 or a strict hostname, no wildcards.
- Both reject scheme, "/", ":" and whitespace; 422 with per-field keys.

Frontend (val.js) mirrors the rules: host/target validators + hosts.ejs fields
point at them. Unit tests in test/unit/hostname_validate.test.js.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

nodejs/public/css/styles.css

@@ -11,8 +11,3 @@ nav.navbar{
 .card-title{
 	font-weight: bold;
 }
-
-.actionMessage{
-	position: fixed;
-}
-

nodejs/public/lib/js/val.js

@@ -61,7 +61,7 @@
 		//checks if empty to stop processing 
 		if(!isNaN(options) && value.length === 0) {
 		}else if(rule in settings.rule){
-			let message = settings.rule[rule].apply(this, [value, options]);
+			message = settings.rule[rule].apply(this, [value, options]);
 		}
 
 		this.validateMessage(message)
@@ -93,41 +93,95 @@
 
 }( jQuery ));
 
-$.validateSettings({
-	rule:{
-		ip: function( value ) {
-			value = value.split( '.' );
- 
-			if ( value.length != 4 ) {
-				return "Malformed IP";
-			}
- 
-			$.each( value, function( key, value ) {
-				if( value > 255 || value < 0 ) {
+// Host / target validation, mirrored from the backend (utils/hostname_validate.js):
+// a bare hostname or IPv4 address, no protocol / "/" / ":" / whitespace. The
+// incoming host may be a wildcard ("*.example.com"); the target may not.
+(function(){
+	var LABEL = /^[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?$/i;
+	var HOSTNAME = /^(?=.{1,253}$)(?:[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?\.)+[a-z]{2,63}$/i;
+	var FORBIDDEN = /[\s/:]/;
+
+	function isIPv4( value ) {
+		var parts = value.split( '.' );
+		if ( parts.length !== 4 ) return false;
+		return parts.every( function( p ) {
+			return /^(0|[1-9]\d{0,2})$/.test( p ) && Number( p ) <= 255;
+		});
+	}
+
+	// Incoming-host pattern: labels may be normal, "*" (one fragment), or "**"
+	// (any number of fragments, incl. a bare "**" global catch-all).
+	function isHostPattern( value ) {
+		if ( value.length > 253 ) return false;
+		return value.split( '.' ).every( function( l ) {
+			return l === '*' || l === '**' || LABEL.test( l );
+		});
+	}
+
+	function forbidden( value ) {
+		return FORBIDDEN.test( value ) || value.includes( '://' );
+	}
+
+	// Incoming host: IPv4 or a wildcard host pattern.
+	function checkHost( value ) {
+		if ( typeof value !== 'string' || value.length === 0 ) return "Required";
+		if ( forbidden( value ) ) return 'No protocol, "/", or ":"';
+		if ( isIPv4( value ) || isHostPattern( value ) ) return;
+		return "Enter a valid host or wildcard (*, **)";
+	}
+
+	// Downstream target: IPv4 or a strict hostname, no wildcard.
+	function checkTarget( value ) {
+		if ( typeof value !== 'string' || value.length === 0 ) return "Required";
+		if ( forbidden( value ) ) return 'No protocol, "/", or ":"';
+		if ( isIPv4( value ) || HOSTNAME.test( value ) ) return;
+		return "Enter a valid hostname or IP";
+	}
+
+	$.validateSettings({
+		rule:{
+			ip: function( value ) {
+				value = value.split( '.' );
+
+				if ( value.length != 4 ) {
 					return "Malformed IP";
 				}
-			});
-		},
 
-		host: function( value ) {
-			var reg = /^(?=.{1,255}$)[0-9A-Za-z](?:(?:[0-9A-Za-z]|-){0,61}[0-9A-Za-z])?(?:\.[0-9A-Za-z](?:(?:[0-9A-Za-z]|-){0,61}[0-9A-Za-z])?)*\.?$/;
-			if ( reg.test( value ) === false ) {
-				return "Invalid";
-			}
-		},
+				$.each( value, function( key, value ) {
+					if( value > 255 || value < 0 ) {
+						return "Malformed IP";
+					}
+				});
+			},
 
-		user: function( value ) {
-			var reg = /^[a-z0-9\_\-\@\.]{1,32}$/;
-			if ( reg.test( value ) === false ) {
-				return "Invalid";
-			}
-		},
- 
-		password: function( value ) {
-			var reg = /^(?=[^\d_].*?\d)\w(\w|[!@#$%]){1,48}/;
-			if ( reg.test( value ) === false ) {
-				return "Weak password, Try again";
+			// Incoming host name — hostname, IPv4, or wildcard pattern (*, **).
+			host: function( value ) {
+				return checkHost( value );
+			},
+
+			// Downstream target — hostname or IPv4, no wildcard.
+			target: function( value ) {
+				return checkTarget( value );
+			},
+
+			// Back-compat alias (no wildcard).
+			hostname: function( value ) {
+				return checkTarget( value );
+			},
+
+			user: function( value ) {
+				var reg = /^[a-z0-9\_\-\@\.]{1,32}$/;
+				if ( reg.test( value ) === false ) {
+					return "Invalid";
+				}
+			},
+
+			password: function( value ) {
+				var reg = /^(?=[^\d_].*?\d)\w(\w|[!@#$%]){1,48}/;
+				if ( reg.test( value ) === false ) {
+					return "Weak password, Try again";
+				}
 			}
 		}
-	}
-});
+	});
+})();