IP validation

Change-Id: I9852efb8acf590242da762de2f9fcde445ec9a66

ios/iosremote/iosremote/Communication/Server.h

@@ -21,3 +21,9 @@ typedef enum protocol {NETWORK} Protocol_t;
                 ofName:(NSString*) name;
 
 @end
+
+@interface NSString (IPValidation)
+
+- (BOOL)isValidIPAddress;
+
+@end

ios/iosremote/iosremote/Communication/Server.m

@@ -7,13 +7,12 @@
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 #import "Server.h"
+#import <arpa/inet.h>
 
 @interface Server()
 
 @end
 
-
-
 @implementation Server
 
 
@@ -54,3 +53,23 @@
 }
 
 @end
+
+
+@implementation NSString (IPValidation)
+
+- (BOOL)isValidIPAddress
+{
+    const char *utf8 = [self UTF8String];
+    int success;
+    
+    struct in_addr dst;
+    success = inet_pton(AF_INET, utf8, &dst);
+    if (success != 1) {
+        struct in6_addr dst6;
+        success = inet_pton(AF_INET6, utf8, &dst6);
+    }
+    
+    return success;
+}
+
+@end

ios/iosremote/iosremote/newServer_vc.m

@@ -22,12 +22,20 @@
 - (IBAction)save:(id)sender {
     NSString *serverName = [self.nameCell.textField text];
     NSString *serverAddr = [self.addrCell.textField text];
-    if (!serverName) {
-        serverName = @"Computer";
+    if ([serverAddr isValidIPAddress]) {
+        if (!serverName)
+            serverName = @"Computer";
+        NSLog(@"New server name:%@ ip:%@", serverName, serverAddr);
+        [self.comManager addServersWithName:serverName AtAddress:serverAddr];
+        [self.navigationController popViewControllerAnimated:YES];
+    } else {
+        UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Invalid IP Address"
+                                                          message:@"A valid IP address should be like this: \"192.168.1.1\""
+                                                         delegate:nil
+                                                cancelButtonTitle:@"OK"
+                                                otherButtonTitles:nil];
+        [message show];
     }
-    NSLog(@"New server name:%@ ip:%@", serverName, serverAddr);
-    [self.comManager addServersWithName:serverName AtAddress:serverAddr];
-    [self.navigationController popViewControllerAnimated:YES];
 }
 
 - (BOOL)isModal