diff --git a/staticlibs/framework/com/android/net/module/util/ProxyUtils.java b/staticlibs/framework/com/android/net/module/util/ProxyUtils.java
index a7b8393..fdd7dca 100644
--- a/staticlibs/framework/com/android/net/module/util/ProxyUtils.java
+++ b/staticlibs/framework/com/android/net/module/util/ProxyUtils.java
@@ -22,6 +22,8 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 /**
  * Collection of network common utilities.
@@ -30,6 +32,28 @@
  */
 public final class ProxyUtils {
 
+    public static final int PROXY_VALID             = 0;
+    public static final int PROXY_HOSTNAME_EMPTY    = 1;
+    public static final int PROXY_HOSTNAME_INVALID  = 2;
+    public static final int PROXY_PORT_EMPTY        = 3;
+    public static final int PROXY_PORT_INVALID      = 4;
+    public static final int PROXY_EXCLLIST_INVALID  = 5;
+
+    // Hostname / IP REGEX validation
+    // Matches blank input, ips, and domain names
+    private static final String NAME_IP_REGEX =
+            "[a-zA-Z0-9]+(\\-[a-zA-Z0-9]+)*(\\.[a-zA-Z0-9]+(\\-[a-zA-Z0-9]+)*)*";
+    private static final Pattern HOSTNAME_PATTERN;
+    private static final String HOSTNAME_REGEXP = "^$|^" + NAME_IP_REGEX + "$";
+    private static final Pattern EXCLLIST_PATTERN;
+    private static final String EXCL_REGEX =
+            "[a-zA-Z0-9*]+(\\-[a-zA-Z0-9*]+)*(\\.[a-zA-Z0-9*]+(\\-[a-zA-Z0-9*]+)*)*";
+    private static final String EXCLLIST_REGEXP = "^$|^" + EXCL_REGEX + "(," + EXCL_REGEX + ")*$";
+    static {
+        HOSTNAME_PATTERN = Pattern.compile(HOSTNAME_REGEXP);
+        EXCLLIST_PATTERN = Pattern.compile(EXCLLIST_REGEXP);
+    }
+
     /** Converts exclusion list from String to List. */
     public static List<String> exclusionStringAsList(String exclusionList) {
         if (exclusionList == null) {
@@ -45,4 +69,30 @@
         }
         return TextUtils.join(",", exclusionList);
     }
+
+    /**
+     * Validate syntax of hostname, port and exclusion list entries
+     */
+    public static int validate(String hostname, String port, String exclList) {
+        Matcher match = HOSTNAME_PATTERN.matcher(hostname);
+        Matcher listMatch = EXCLLIST_PATTERN.matcher(exclList);
+
+        if (!match.matches()) return PROXY_HOSTNAME_INVALID;
+
+        if (!listMatch.matches()) return PROXY_EXCLLIST_INVALID;
+
+        if (hostname.length() > 0 && port.length() == 0) return PROXY_PORT_EMPTY;
+
+        if (port.length() > 0) {
+            if (hostname.length() == 0) return PROXY_HOSTNAME_EMPTY;
+            int portVal = -1;
+            try {
+                portVal = Integer.parseInt(port);
+            } catch (NumberFormatException ex) {
+                return PROXY_PORT_INVALID;
+            }
+            if (portVal <= 0 || portVal > 0xFFFF) return PROXY_PORT_INVALID;
+        }
+        return PROXY_VALID;
+    }
 }