[iOS][iPhone] basic ifconfig view for Master-Detail project template

gistfile1.m

#import "BJMasterViewController.h"

#import "BJDetailViewController.h"

#include <ifaddrs.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <arpa/inet.h>

@interface BJMasterViewController ()

@property (strong) NSMutableArray *interfaces;

@end

@implementation BJMasterViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        self.title = NSLocalizedString(@"Master", @"Master");
        if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
            self.clearsSelectionOnViewWillAppear = NO;
            self.contentSizeForViewInPopover = CGSizeMake(320.0, 600.0);
        }
        self.interfaces = [NSMutableArray array];
        
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidBecomeActive:) name:UIApplicationDidBecomeActiveNotification object:nil];
    }
    return self;
}
  						
- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
    self.navigationItem.leftBarButtonItem = self.editButtonItem;

    UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)];
    self.navigationItem.rightBarButtonItem = addButton;
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)applicationDidBecomeActive:(NSNotification *)notif
{
    [self insertNewObject:nil];
}
- (void)insertNewObject:(id)sender
{
    self.interfaces = [NSMutableArray array];
    
    struct ifaddrs *ifbase;
    getifaddrs(&ifbase);
    
    for (struct ifaddrs *ifaddr = ifbase; ifaddr; ifaddr = ifaddr->ifa_next) {
        NSMutableDictionary *info = [NSMutableDictionary dictionaryWithDictionary:
                                     @{
                                     @"name": @(ifaddr->ifa_name),
                                     @"flags": @(ifaddr->ifa_flags),
                                     @"family": @(ifaddr->ifa_addr->sa_family),
                                     }];
        if (ifaddr->ifa_addr->sa_family == AF_LINK) {
            info[@"MAC"] = @(link_ntoa((struct sockaddr_dl *)ifaddr->ifa_addr));
        }
        if (ifaddr->ifa_addr->sa_family == AF_INET) {
            info[@"IP"] = @(inet_ntoa(((struct sockaddr_in *)ifaddr->ifa_addr)->sin_addr));
        }
        if (ifaddr->ifa_addr->sa_family == AF_INET6) {
            struct in6_addr addr = ((struct sockaddr_in6 *)ifaddr->ifa_addr)->sin6_addr;
            __uint32_t *addr32 = addr.__u6_addr.__u6_addr32;
            info[@"IP"] = [NSString stringWithFormat:@"%08x:%08x:%08x:%08x", ntohl(addr32[0]), ntohl(addr32[1]), ntohl(addr32[2]), ntohl(addr32[3])];
        }
        [self.interfaces addObject:info];
    }
    
    freeifaddrs(ifbase);
    
    [self.tableView reloadData];
}

#pragma mark - Table View

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.interfaces.count;
}

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        }
        cell.textLabel.font = [UIFont boldSystemFontOfSize:11];
    }


    NSDictionary *info = self.interfaces[indexPath.row];
    NSString *text = [NSString stringWithFormat:@"%@,%04X,%02d", info[@"name"], [info[@"flags"] intValue], [info[@"family"] intValue]];
    if (info[@"MAC"]) text = [text stringByAppendingFormat:@",%@", info[@"MAC"]];
    if (info[@"IP"]) text = [text stringByAppendingFormat:@",%@", info[@"IP"]];
    
    cell.textLabel.text = text;
    cell.textLabel.adjustsFontSizeToFitWidth = YES;
    return cell;
}

@end