Get DNS Server IP

gistfile1.m

+ (NSString *) getDNSServers
{
    NSMutableString *addresses = [[NSMutableString alloc]initWithString:@"DNS Addresses \n"];
    
    res_state res = malloc(sizeof(struct __res_state));
    
    int result = res_ninit(res);
    
    if ( result == 0 )
    {
        for ( int i = 0; i < res->nscount; i++ )
        {
            NSString *s = [NSString stringWithUTF8String :  inet_ntoa(res->nsaddr_list[i].sin_addr)];
            [addresses appendFormat:@"%@\n",s];
            NSLog(@"%@",s);
        }
    }
    else
        [addresses appendString:@" res_init result != 0"];
    
    return addresses;
}