Check if a string is a valid MAC address

How to test if a string is a valid MAC address?
You need:
- http://objective-c-functions.blogspot.com/2013/08/check-if-number-is-valid-hex.html


/** Check if a MAC address is valid.

 MAC address must be in the 12:34:56:78:9A:BC format.

 @param mac String representing the MAC address to check.
 @return Returns true if given MAC address is valid, false otherwise.
 @see macAddressWithColonsFromString:
 @see getMacAddressesFromFileAtPath:

 */
+ (BOOL)isValidMacAddress:(NSString *)mac {

    // Must be 17 chars.
    NSInteger len = [mac length];
    if (len != 17) {
        return NO;
    }

    // Let's valide all characters.
    NSString *tempStr;
    if (len == 17) {

        // Loop by couples plus separator (eg: "C6:").
        for (NSInteger i=0; i<=len; i+=3) {

            // Position 0: hex char.
            tempStr = [mac substringWithRange:NSMakeRange(i+0, 1)];
            if (![LMFunctions isHexadecimalNumber:tempStr]) { return NO; }

            // Position 1: hex char.
            tempStr = [mac substringWithRange:NSMakeRange(i+1, 1)];
            if (![LMFunctions isHexadecimalNumber:tempStr]) { return NO; }

            // Position 2: separator.
            if (i+2 < len) // Warning: last separator does not exist.
            {
                tempStr = [mac substringWithRange:NSMakeRange(i+2, 1)];
                if (![tempStr isEqualToString:@":"]) { return NO; }
            }
        }
    }

    return YES;
}


Download the ready-for-use source file (.m) of Check if a string is a valid MAC address

Check if a string is a valid IP address (IPv4 and IPv6)

This function checks if an IP address (either IPv4 or IPv6) is valid.


/** Check if an IP address is valid.

 Looks for both IPv4 and IPv6.
 Based on: http://stackoverflow.com/questions/1679152/how-to-validate-an-ip-address-with-regular-expression-in-objective-c/10971521#10971521

 @param ip IP address as string.
 @return Returns true if given IP address is valid, false otherwise.

 */
+ (BOOL)isValidIpAddress:(NSString *)ip {
    const char *utf8 = [ip UTF8String];

    // Check valid IPv4.
    struct in_addr dst;
    int success = inet_pton(AF_INET, utf8, &(dst.s_addr));
    if (success != 1) {
        // Check valid IPv6.
        struct in6_addr dst6;
        success = inet_pton(AF_INET6, utf8, &dst6);
    }
    return (success == 1);
}


Download the ready-for-use source file (.m) of Check if a string is a valid IP address (IPv4 and IPv6)

Get a list of items from a file (eg: MAC address)

I often save a set of items in a txt file so then I can "load" them directly from that file.
For example, this is a function which purpose is read MAC addresses from a given file. Of course you can adapt it to your needs.


/** Returns all the MAC addresses written in a file.

 This function treats every line as a MAC address.

 @param filePath The path of the file to search through.
 @return An array containing all the MAC addresses found in the file.
 @see macAddressWithColonsFromString:
 @see isValidMacAddress:

 */
+ (NSArray *)getMacAddressesFromFileAtPath:(NSString *)filePath {

    if (filePath) {
        NSString *str = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:NULL];
        NSArray *arr = [[NSArray alloc] initWithArray:[str componentsSeparatedByString:@"\n"]];
        return arr;
    } else {
        return nil;
    }
}


Download the ready-for-use source file (.m) of Get a list of items from a file (eg: MAC address)

Get my own IP address on iPhone (or iPad, iPod)

What's my IP?
It works on both iOS (iPhone, iPad, iPod) and Mac OS Xcode projects.


/** Returns the local own IP address.

 @return Returns the IP address as string.

 */
+ (NSString *)myIpAddress {
    NSString *address = @"127.0.0.1"; // Default value that means you're probably not connected to a network.
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = getifaddrs(&interfaces); // Retrieve the current interfaces - returns 0 on success.
    if (success == 0) {
        // Loop through linked list of interfaces.
        temp_addr = interfaces;
        while ( temp_addr != NULL ) {
            if ( temp_addr->ifa_addr->sa_family == AF_INET ) {
                // Check if interface is en0 which is the wifi connection on the iPhone.
                if ( [[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"] ) {
                    // Get NSString from C String.
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
    }
    // Free memory.
    freeifaddrs(interfaces);
    return address;
}


Download the ready-for-use source file (.m) of Get my own IP address on iPhone (or iPad, iPod)