Find IP address in iphone - iphone

Question

I want to find IP address in an application. I am able to find it. But, problem is, it works fins in iphone os 2.0 or so. But, in iphone os 3.0 it is giving me a warning:
warning: no '+currentHost' method found
warning: (Messages without a matching method signature)
I am using this code, and it works fine with os version 2.0.
-(NSString*)getAddress {
char iphone_ip[255];
strcpy(iphone_ip,"127.0.0.1"); // if everything fails
NSHost* myhost = [NSHost currentHost];
if (myhost)
{
NSString *ad = [myhost address];
if (ad)
strcpy(iphone_ip,[ad cStringUsingEncoding: NSISOLatin1StringEncoding]);
}
return [NSString stringWithFormat:#"%s",iphone_ip];
}
How to find IP address in iphone os 3.0 or greater os version?
Thanks in advance.

Answer 1

#include <arpa/inet.h>
#include <netdb.h>
#include <net/if.h>
#include <ifaddrs.h>
// retun the host name
+ (NSString *)hostname
{
char baseHostName[256];
int success = gethostname(baseHostName, 255);
if (success != 0) return nil;
baseHostName[255] = '\0';
#if !TARGET_IPHONE_SIMULATOR
return [NSString stringWithFormat:#"%s.local", baseHostName];
#else
return [NSString stringWithFormat:#"%s", baseHostName];
#endif
}
// return IP Address
+ (NSString *)localIPAddress
{
struct hostent *host = gethostbyname([[self hostname] UTF8String]);
if (!host) {herror("resolv"); return nil;}
struct in_addr **list = (struct in_addr **)host->h_addr_list;
return [NSString stringWithCString:inet_ntoa(*list[0]) encoding:NSUTF8StringEncoding];
}

Answer 2

As far as I know there is only one hacky way to do that. You basically open a socket and get its address using POSIX functions. Here is the code I used for this:
http://iphonesdksnippets.com/post/2009/09/07/Get-IP-address-of-iPhone.aspx
[NSHost currentHost] will also work, but it is deprecated and considered a "Private API" by Apple, so you won't be able to submit your application to App Store.

Answer 3

Put this script on a web server running PHP:
<?php
$ip = getenv("REMOTE_ADDR");
echo $ip;
?>
Call this on the device:
NSURL *scriptURL = [[NSURL alloc] initWithString:#"http://yourserver.com/script.php"];
NSString *ip = [NSString stringWithContentsOfURL: scriptURL encoding:NSASCIIStringEncoding error:nil];

Answer 4

- (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
// it may also be en1 on your ipad3.
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;
}
Use this to get your IP
If any errors
Please use
#include <ifaddrs.h>
#include <arpa/inet.h>

Answer 5

Getting the IP address is a bit hacky. Are you sure you couldn't live with the device ID (UDID) that is unique to each iPhone and can be retrieved easily via the public API ?
[UIDevice currentDevice].uniqueIdentifier

Answer 6

There is one more way to get the IP address and that too Global IP
NSString* ip=#"http://www.whatismyip.org/";
NSURL *url = [[NSURL alloc] initWithString:ip];
NSString *ans = [NSString stringWithContentsOfURL:url encoding:NSASCIIStringEncoding error:&error];
NSLog(#"%#",ans);
The above site will give you the Global IP.
Just put this in your code and use the IP address where ever you want and also get the location of the user using your app as this gives global IP.

Answer 7

You should have a look to this good project:
uidevice-extension
Specialy this class
Import UIDevice-Reachability.h in your project then try with one of those commands:
NSString *myIp = [UIDevice localIPAddress];
NSString *myIp = [UIDevice localWiFiIPAddress];
NSString *myIp = [UIDevice whatismyipdotcom]; // is using #aamritrao solution

Answer 8

bool success;
struct ifaddrs *addrs;
const struct ifaddrs *cursor;
const struct sockaddr_dl *dlAddr;
const uint8_t *base;
int i;
success = getifaddrs(&addrs) == 0;
if (success) {
cursor = addrs;
while (cursor != NULL) {
if ( (cursor->ifa_addr->sa_family == AF_LINK)
&& (((const struct sockaddr_dl *) cursor->ifa_addr)->sdl_type ==IFT_ETHER)
) {
dlAddr = (const struct sockaddr_dl *) cursor->ifa_addr;
// fprintf(stderr, " sdl_nlen = %d\n", dlAddr->sdl_nlen);
// fprintf(stderr, " sdl_alen = %d\n", dlAddr->sdl_alen);
base = (const uint8_t *) &dlAddr->sdl_data[dlAddr->sdl_nlen];
printf(" MAC address ");
for (i = 0; i < dlAddr->sdl_alen; i++) {
if (i != 0) {
printf(":");
}
printf("%02x", base[i]);
}
printf("\n");
}
cursor = cursor->ifa_next;
}
}