CODEWITHSUNDEEP
iphoneobjective-ccocoa-touchios
YosiFZ
YosiFZ

Reputation: 7900

How to get the external ip in Objective-C

I looked for some code that will help me to get the ip that the iPhone connect with.

I find this one:

- (NSString *)getIPAddress
{
    NSString *address = @"error";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;

    // retrieve the current interfaces - returns 0 on success
    success = getifaddrs(&interfaces);
    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;
}

but the problem is that he get me this ip 10.0.0.1

How to get the external ip?

Upvotes: 6

Views: 12058

Answers (4)

Jan Ehrhardt
Jan Ehrhardt

Reputation: 405

Late to the party, but https://api4.ipify.org or http://api4.ipify.org returns nothing else but the external IPv4 address of your connection. Code:

NSURL *ipifyUrl = [NSURL URLWithString:@"https://api4.ipify.org/"];
NSString *externalAddr = [NSString stringWithContentsOfURL:ipifyUrl encoding:NSUTF8StringEncoding error:nil];

https://api6.ipify.org returns the external IPv6 address and https://api64.ipify.org either the IPv4 or the IPv6 address. Simple documentation can be found at https://www.ipify.org

Upvotes: 0

unexpectedvalue
unexpectedvalue

Reputation: 6139

Check Apple's PortMapper, does exactly what you want.

As of iOS7 this is irrelevant.

Upvotes: 2

markhunte
markhunte

Reputation: 6932

Have a look at the example in my second Answer here.

In a nutshell it uses *http://www.dyndns.org/cgi-bin/check_ip.cg*i to get the extenal I.P

Upvotes: 2

Black Frog
Black Frog

Reputation: 11725

The easiest way to get your internet ip address from code is to use NSURLConnection.

For the URL you can use: http://www.whatismyip.com/m/mobile.asp or http://checkip.dyndns.com/

Just parse the return data and you have your external ip address.

Upvotes: 4

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