// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#import <Foundation/Foundation.h>

#import "SystemConfiguration/CaptiveNetwork.h"

#include <arpa/inet.h>
#include <ifaddrs.h>

NSString* getWifiIP() {
  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;
}