如何在 iOS/macOS 上以编程方式获取我的 IP 地址？

Question

我想以编程方式获取我的 iPad 的 IP 地址。 如何查询网络子系统以找出我的 IPv4（和 IPv6）地址是什么？

PS：我可以以某种方式禁用 IPv6 吗？

Answer 1

以下代码在 iOS 或 OSX 设备上查找所有 IPv4 和 IPv6 地址。 第一个getIPAddress方法或多或少地充当此答案中的旧代码：您可以更喜欢一种或另一种类型的地址，并且它总是更喜欢 WIFI 而不是蜂窝网络（显然您可以更改此设置）。

更有趣的是，它可以返回找到的所有地址的字典，跳过not up接口的地址或与loopback关联的地址。 前面的代码以及关于此主题的其他解决方案将无法正确解码 IPv6（inet_ntoa 无法处理它们）。 Jens Alfke在 Apple 论坛上向我指出了这一点 - 正确使用的 function 是 inet_ntop（查看手册页，或参考 Jens 提供的这篇inet_ntop文章。

字典键的格式为“interface”“/”“ipv4 或 ipv6”。

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

#define IOS_CELLULAR    @"pdp_ip0"
#define IOS_WIFI        @"en0"
//#define IOS_VPN       @"utun0"
#define IP_ADDR_IPv4    @"ipv4"
#define IP_ADDR_IPv6    @"ipv6"

- (NSString *)getIPAddress:(BOOL)preferIPv4
{
    NSArray *searchArray = preferIPv4 ?
                            @[ /*IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6,*/ IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6 ] :
                            @[ /*IOS_VPN @"/" IP_ADDR_IPv6, IOS_VPN @"/" IP_ADDR_IPv4,*/ IOS_WIFI @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4 ] ;

    NSDictionary *addresses = [self getIPAddresses];
    NSLog(@"addresses: %@", addresses);

    __block NSString *address;
    [searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
        {
            address = addresses[key];
            if(address) *stop = YES;
        } ];
    return address ? address : @"0.0.0.0";
}

- (NSDictionary *)getIPAddresses
{
    NSMutableDictionary *addresses = [NSMutableDictionary dictionaryWithCapacity:8];

    // retrieve the current interfaces - returns 0 on success
    struct ifaddrs *interfaces;
    if(!getifaddrs(&interfaces)) {
        // Loop through linked list of interfaces
        struct ifaddrs *interface;
        for(interface=interfaces; interface; interface=interface->ifa_next) {
            if(!(interface->ifa_flags & IFF_UP) /* || (interface->ifa_flags & IFF_LOOPBACK) */ ) {
                continue; // deeply nested code harder to read
            }
            const struct sockaddr_in *addr = (const struct sockaddr_in*)interface->ifa_addr;
            char addrBuf[ MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN) ];
            if(addr && (addr->sin_family==AF_INET || addr->sin_family==AF_INET6)) {
                NSString *name = [NSString stringWithUTF8String:interface->ifa_name];
                NSString *type;
                if(addr->sin_family == AF_INET) {
                    if(inet_ntop(AF_INET, &addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv4;
                    }
                } else {
                    const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)interface->ifa_addr;
                    if(inet_ntop(AF_INET6, &addr6->sin6_addr, addrBuf, INET6_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv6;
                    }
                }
                if(type) {
                    NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];
                    addresses[key] = [NSString stringWithUTF8String:addrBuf];
                }
            }
        }
        // Free memory
        freeifaddrs(interfaces);
    }
    return [addresses count] ? addresses : nil;
}

EDIT1：代码于 2014 年 5 月 16 日更新（lhunath 指出的错误，请参阅评论）。 环回地址现已返回，但您可以轻松取消注释测试以自行排除它们。

EDIT2：（由一些不知名的人）：2015 年 3 月 13 日进一步改进：如果用户使用 VPN（无论是通过 WiFi 还是蜂窝网络），之前的代码都会失败。 现在，它甚至可以使用 VPN 连接。 VPN 连接优先于 WiFi 和 Cell，因为这就是设备处理它的方式。 这甚至应该适用于 Mac，因为 Mac 上的 VPN 连接也使用 IF utun0 但未经测试。

EDIT3：（2016 年 9 月 8 日）鉴于@Qiulang（见评论）与 VPN 代码（其他人添加）遇到的问题，我已将其注释掉。 如果有人明确知道如何指定用户 VPN，请发表评论。

Answer 2

在您的实现 file.m 中，

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



// Get IP Address
- (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;

} 

Answer 3

许多现有的解决方案只考虑无线接口，这不适用于通过以太网适配器进行的有线连接（即没有 Wifi 或 3G）； 请参阅此更新的解决方案，该解决方案也考虑了通过有线接口获得的 IP 地址。

iPad：如何以编程方式有线（不通过无线）获取 IP 地址

Answer 4

使用 Swift 3 获取 IP 地址：

func getIPAddress() -> String {
    var address: String = "error"

    var interfaces: ifaddrs? = nil

    var temp_addr: ifaddrs? = nil
    var success: Int = 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 != nil {
            if temp_addr?.ifa_addr?.sa_family == AF_INET {
                // Check if interface is en0 which is the wifi connection on the iPhone
                if (String(utf8String: temp_addr?.ifa_name) == "en0") {
                    // Get NSString from C String
                    address = String(utf8String: inet_ntoa((temp_addr?.ifa_addr as? sockaddr_in)?.sin_addr))
                }
            }
            temp_addr = temp_addr?.ifa_next
        }
    }
        // Free memory
    freeifaddrs(interfaces)
    return address
}

Answer 5

当前解决方案在 OS X 上不返回 en0 设备，以下代码使用系统配置框架获取接口，然后使用标准 C 函数获取 IP 地址。

#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/ioctl.h>
#include <net/if.h>
#define IFT_ETHER 0x6

#include <SystemConfiguration/SCDynamicStore.h>

+(void)getInterfaces
{
    SCDynamicStoreRef storeRef = SCDynamicStoreCreate(NULL, (CFStringRef)@"FindCurrentInterfaceIpMac", NULL, NULL);
    CFPropertyListRef global = SCDynamicStoreCopyValue (storeRef,CFSTR("State:/Network/Interface"));
    id primaryInterface = [(__bridge NSDictionary *)global valueForKey:@"Interfaces"];

    for (NSString* item in primaryInterface)
    {
        if(get_iface_address([item UTF8String]))
        {
            NSString *ip = [NSString stringWithUTF8String:get_iface_address([item UTF8String])];
            NSLog(@"interface: %@ - %@",item,ip);
        } else
            NSLog(@"interface: %@",item);
    }
}

static char * get_iface_address (char *interface)
{
    int sock;
    uint32_t ip;
    struct ifreq ifr;
    char *val;

    if (!interface)
        return NULL;

    /* determine UDN according to MAC address */
    sock = socket (AF_INET, SOCK_STREAM, 0);
    if (sock < 0)
    {
        perror ("socket");
        return NULL;
    }

    strcpy (ifr.ifr_name, interface);
    ifr.ifr_addr.sa_family = AF_INET;

    if (ioctl (sock, SIOCGIFADDR, &ifr) < 0)
    {
        perror ("ioctl");
        close (sock);
        return NULL;
    }

    val = (char *) malloc (16 * sizeof (char));
    ip = ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr;
    ip = ntohl (ip);
    sprintf (val, "%d.%d.%d.%d",
             (ip >> 24) & 0xFF, (ip >> 16) & 0xFF, (ip >> 8) & 0xFF, ip & 0xFF);

    close (sock);

    return val;
}

Answer 6

这个答案的灵感来自@DavidH 的答案。 我修复了一些问题，用getnameinfo替换inet_ntop ，它允许使用更简洁的方法。 请注意，这会产生一个字典，它将接口名称映射到 IP 地址数组（从技术上讲，一个接口可以有多个与之关联的 IPv4 和 IPv6）。 它不区分 IPv4 和 IPv6：

  // Get all our interface addresses.
  struct ifaddrs *ifAddresses;
  if (getifaddrs( &ifAddresses ) != 0) {
    NSLog( @"Couldn't get interface addresses: %d", errno );
    return nil;
  }

  int error;
  char host[MAX( INET_ADDRSTRLEN, INET6_ADDRSTRLEN )];
  _ipAddressesByInterface = [NSMutableDictionary dictionaryWithCapacity:8];

  for (struct ifaddrs *ifAddress = ifAddresses; ifAddress; ifAddress = ifAddress->ifa_next) {
    if (!(ifAddress->ifa_flags & IFF_UP) || (ifAddress->ifa_flags & IFF_LOOPBACK))
      // Ignore interfaces that aren't up and loopback interfaces.
      continue;

    if (ifAddress->ifa_addr->sa_family != AF_INET && ifAddress->ifa_addr->sa_family != AF_INET6)
      // Ignore non-internet addresses.
      continue;

    if ((error = getnameinfo( ifAddress->ifa_addr, ifAddress->ifa_addr->sa_len, host, sizeof( host ), NULL, 0, NI_NUMERICHOST )) != noErr) {
      // Couldn't to format host name for this address.
      NSLog( @"Couldn't resolve host name for address: %s", gai_strerror( error ) );
      continue;
    }

    NSString *ifName = [NSString stringWithCString:ifAddress->ifa_name encoding: NSUTF8StringEncoding];
    NSMutableArray *ifIpAddresses = _ipAddressesByInterface[ifName];
    if (!ifIpAddresses)
      ifIpAddresses = _ipAddressesByInterface[ifName] = [NSMutableArray arrayWithCapacity:2];
    [ifIpAddresses addObject:[NSString stringWithCString:host encoding: NSUTF8StringEncoding]];
  }

  freeifaddrs( ifAddresses );
  return _ipAddressesByInterface;

Answer 7

@DavidH 的回答很好，直到我从一些 4G 蜂窝网络得到这个结果：

{
    "lo0/ipv4" = "127.0.0.1";
    "lo0/ipv6" = "fe80::1";
    "pdp_ip0/ipv4" = "10.132.76.168";
    "utun0/ipv6" = "fe80::72c3:e25e:da85:b730";
}

我没有使用 vpn，所以我不知道为什么我有一个 utun0/ipv6。

- - 更新 - -

我进一步调试了这个问题，发现即使在其他4G网络中我也可以得到一个假的vpn地址（这是iOS错误吗？？），

{
    ""awdl0/ipv6"" = ""fe80::c018:9fff:feb2:988"";
    ""en0/ipv6"" = ""fe80::181a:2e43:f91b:db2b"";
    ""lo0/ipv4"" = ""127.0.0.1"";
    ""lo0/ipv6"" = ""fe80::1"";
    ""pdp_ip0/ipv4"" = ""10.48.10.210"";
    ""utun0/ipv4"" = ""192.168.99.2"";
}

如果我确实使用了 vpn，我会得到这个：

{
    "lo0/ipv4" = "127.0.0.1";
    "lo0/ipv6" = "fe80::1";
    "pdp_ip0/ipv4" = "10.49.187.23";
    "utun0/ipv6" = "fe80::5748:5b5d:2bf0:658d";
    "utun1/ipv4" = "192.168.99.2"; //the real one
}

所以它是utun1 而不是utun0

不知道为什么我只需要放弃 vpn 检查:(

- - 更新 - -

我向苹果提出了一个错误（28131847）并回答“并非所有 utun 接口都用于 VPN。还有其他使用 utun 接口的操作系统功能。”

但是当我问如何获得有效的 vpn IP 地址时，他们的回答相当失望，“你可以 go 进入设置 - > VPN 并查看你的 VPN 配置以查看 VPN 是否处于活动状态。在某些情况下，你可以看到在那里也分配了 IP 地址。我们现在关闭此错误报告。":(

---- 更新 2016/11/04 ----

我再次遇到了这个问题，我需要进一步修改@DavidH 的答案来解决它：

我在4G网络中，我得到了这个地址：

addresses: {
    "awdl0/ipv6" = "fe80::98fd:e6ff:fea9:3afd";
    "en0/ipv6" = "fe80::8dd:7d92:4159:170e";
    "lo0/ipv4" = "127.0.0.1";
    "lo0/ipv6" = "fe80::1";
    "pdp_ip0/ipv4" = "10.37.212.102";
    "utun0/ipv6" = "fe80::279c:ea56:a2ef:d128";
}

通过他的原始答案，我将获得 wifi IP fe80::8dd:7d92:4159:170e，这是假的并且连接失败。

所以我将代码修改为喜欢，

[searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
 {
     if ((internetReach.isReachableViaWiFi && [key hasPrefix:IOS_WIFI]) ||
         (internetReach.isReachableViaWWAN && [key hasPrefix:IOS_CELLULAR])) {
         address = addresses[key];
         if(address) *stop = YES;
     }
 } ];

Answer 8

此文件中 swift 的绝佳解决方案，提供所有详细信息。

在我的一个应用程序中，我需要获取 wifi IP 地址。 我在 swift 3 中使用了上面的答案，如下所示：

let WIFI_IF = "en0"
let UNKNOWN_IP_ADDRESS = ""
var addresses: [AnyHashable: Any] = ["wireless": UNKNOWN_IP_ADDRESS, "wired": UNKNOWN_IP_ADDRESS, "cell": UNKNOWN_IP_ADDRESS]
var interfaces: UnsafeMutablePointer<ifaddrs>? = nil
var temp_addr: UnsafeMutablePointer<ifaddrs>? = nil
var success: Int = 0
success = Int(getifaddrs(&interfaces))
if success == 0 {
   temp_addr = interfaces
   while temp_addr != nil {
      if temp_addr?.pointee.ifa_addr == nil {
           continue
      }
      if temp_addr?.pointee.ifa_addr.pointee.sa_family == UInt8(AF_INET) {
         if (String(utf8String: (temp_addr?.pointee.ifa_name)!) == WIFI_IF) {
             addresses["wireless"] = String(utf8String: inet_ntoa(((temp_addr?.pointee.ifa_addr as? sockaddr_in)?.sin_addr)!))
         }
      }
      temp_addr = temp_addr?.pointee.ifa_next
   }
}

在这段代码中，它崩溃了，因为我必须在我用作可选的每个语句中检查nil ? . 所以我最好在我的 class 中使用给定的链接文件。 我现在很容易检查如下：

class func getWifiIPAddress() -> String {
    var wifiIp = ""

    let WIFI_IF = "en0"
    let allInterface = Interface.allInterfaces()

    for interf in allInterface {
        if interf.name == WIFI_IF {
            if let address = interf.address {

                if address.contains(".") {
                wifiIp = address
                break
                }
            }
        }
    }

    return wifiIp
}

我已经为"."解析了字符串。 因为接口 Class 在我的 iPhone 中返回两个接口，用于en0地址如“fb00::”和地址如“101.10.1.1”

Answer 9

我创建了一个简单的文件来获取 ip 地址。 我将此解决方案基于@lundhjem、@DavidH 和@Ihunath 的答案。 它考虑有线连接。 虽然我没有在这个解决方案中包含 VPN。

PCNetwork.h

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface PCNetwork : NSObject
+ (NSString *)getIPAddress; // Prefers IPv4
+ (NSString *)getIPAddress:(BOOL)preferIPv4;
+ (NSDictionary *)getIPAddresses;
@end

NS_ASSUME_NONNULL_END

个人电脑网络.m

#import "PCNetwork.h"
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <net/if.h>

#define IP_UNKNOWN          @"0.0.0.0"
#define IP_ADDR_IPv4        @"ipv4"
#define IP_ADDR_IPv6        @"ipv6"

@implementation PCNetwork
#pragma mark - IP
+ (NSString *)getIPAddress {
    return [self getIPAddress:YES];
}

+ (NSString *)getIPAddress:(BOOL)preferIPv4 {
    NSArray *searchArray = [self getAllIFSearchArray:preferIPv4];
    NSDictionary *addresses = [self getIPAddresses];
    DLog(@"addresses: %@", addresses);

    __block NSString *address = nil;
    [searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop) {
         address = addresses[key];
         if(address) *stop = YES;
     }];
    return address ?: IP_UNKNOWN;
}

+ (NSDictionary *)getIPAddresses {
    NSMutableDictionary *addresses = [NSMutableDictionary dictionary];
    struct ifaddrs *interfaces;
    BOOL success = !getifaddrs(&interfaces); // Retrieve the current interfaces : returns 0 on success
    if (success) {
        struct ifaddrs *temp_interface;
        for (temp_interface = interfaces; temp_interface; temp_interface = temp_interface->ifa_next) { // Loop through linked list of interfaces
            if (!(temp_interface->ifa_flags & IFF_UP) || (temp_interface->ifa_flags & IFF_LOOPBACK)) { // Ignore interfaces that aren't up and loopback interfaces.
                continue;
            }

            if (!temp_interface->ifa_addr) {
                continue;
            }

            const struct sockaddr_in *temp_addr = (const struct sockaddr_in*)temp_interface->ifa_addr;
            if (temp_addr->sin_family == AF_INET || temp_addr->sin_family == AF_INET6) {
                char addrBuf[MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN)];
                NSString *name = [NSString stringWithUTF8String:temp_interface->ifa_name];
                NSString *type = nil;
                if (temp_addr->sin_family == AF_INET) {
                    if (inet_ntop(AF_INET, &temp_addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv4;
                    }
                } else {
                    const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)temp_interface->ifa_addr; // AF_INET6
                    if (inet_ntop(AF_INET6, &addr6->sin6_addr, addrBuf, INET6_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv6;
                    }
                }

                if (type) {
                    NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];
                    addresses[key] = [NSString stringWithUTF8String:addrBuf];
                }
            }
        }
        freeifaddrs(interfaces); // Free memory
    }
    return addresses.count ? addresses.copy : nil;
}

#pragma mark - Inter Frame Spacing
+ (NSArray *)getAllIFSearchArray:(BOOL)preferIPv4 {
    NSArray *KNOWN_WIFI_IFS = @[@"en0"];
    NSArray *KNOWN_WIRED_IFS = @[@"en1",@"en2",@"en3",@"en4"];
    NSArray *KNOWN_CELL_IFS = @[@"pdp_ip0",@"pdp_ip1",@"pdp_ip2",@"pdp_ip3"];

    NSMutableArray *searchArray = [NSMutableArray array];

    // Add wifi
    [searchArray addObjectsFromArray:[self getIFSearchArrayWith:KNOWN_WIFI_IFS preferIPv4:preferIPv4]];

    // Add cell
    [searchArray addObjectsFromArray:[self getIFSearchArrayWith:KNOWN_CELL_IFS preferIPv4:preferIPv4]];

    // Add wired
    [searchArray addObjectsFromArray:[self getIFSearchArrayWith:KNOWN_WIRED_IFS preferIPv4:preferIPv4]];

    return searchArray.copy;
}

+ (NSArray *)getIFSearchArrayWith:(NSArray *)iFList preferIPv4:(BOOL)preferIPv4 {
    NSMutableArray *searchArray = [NSMutableArray array];
    for (NSString *iFType in iFList) {
        if (preferIPv4) {
            [searchArray addObject:[NSString stringWithFormat:@"%@/%@", iFType, IP_ADDR_IPv4]];
            [searchArray addObject:[NSString stringWithFormat:@"%@/%@", iFType, IP_ADDR_IPv6]];
        } else {
            [searchArray addObject:[NSString stringWithFormat:@"%@/%@", iFType, IP_ADDR_IPv6]];
            [searchArray addObject:[NSString stringWithFormat:@"%@/%@", iFType, IP_ADDR_IPv4]];
        }
    }
    return searchArray.copy;
}

@end

Answer 10

在 iOS 13.4.1 中不适合我。 我用这个修复它。

+ (NSString *)getIPAddress{
    NSArray *searchArray =
    @[ IOS_VPN @"/" IP_ADDR_IPv4, IOS_VPN @"/" IP_ADDR_IPv6, IOS_WIFI @"/" IP_ADDR_IPv4, IOS_WIFI @"/" IP_ADDR_IPv6, IOS_4_3G @"/" IP_ADDR_IPv4, IOS_4_3G @"/" IP_ADDR_IPv6, IOS_CELLULAR @"/" IP_ADDR_IPv4, IOS_CELLULAR @"/" IP_ADDR_IPv6];

    __block NSDictionary *addresses = [self getIPAddressArray];

    __block NSString *address;
    [searchArray enumerateObjectsUsingBlock:^(NSString *key, NSUInteger idx, BOOL *stop)
    {
         address = addresses[key];
         if ([key rangeOfString:@"ipv6"].length > 0  && ![[NSString stringWithFormat:@"%@",addresses[key]] hasPrefix:@"(null)"] ) {
             if ( ![addresses[key] hasPrefix:@"fe80"]) {
                 //     isIpv6 = YES;
                 *stop = YES;
              }
         }else{
             if([self isValidatIP:address]) {
                 *stop = YES;
             }
         }
     } ];
    return address ? address : @"error";
}
+ (NSString *)getIPType{
    NSString *ipAddress = [self getIPAddress];
    if ([self isValidatIP:ipAddress]) {
        return @"04";//ipv4
    }else{
        return @"06";//ipv6
    }
}
+ (NSDictionary *)getIPAddressArray{
    NSMutableDictionary *addresses = [NSMutableDictionary dictionaryWithCapacity:8];
    // retrieve the current interfaces - returns 0 on success
    struct ifaddrs *interfaces;
    if(!getifaddrs(&interfaces)) {
        // Loop through linked list of interfaces
        struct ifaddrs *interface;
        for(interface=interfaces; interface; interface=interface->ifa_next) {
            if(!(interface->ifa_flags & IFF_UP) /* || (interface->ifa_flags & IFF_LOOPBACK) */ ) {
                continue; // deeply nested code harder to read
            }
            const struct sockaddr_in *addr = (const struct sockaddr_in*)interface->ifa_addr;
            char addrBuf[ MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN) ];
            if(addr && (addr->sin_family==AF_INET || addr->sin_family==AF_INET6)) {
                NSString *name = [NSString stringWithUTF8String:interface->ifa_name];
                NSString *type;
                if(addr->sin_family == AF_INET) {
                    if(inet_ntop(AF_INET, &addr->sin_addr, addrBuf, INET_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv4;
                    }
                } else {
                    const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6*)interface->ifa_addr;
                    if(inet_ntop(AF_INET6, &addr6->sin6_addr, addrBuf, INET6_ADDRSTRLEN)) {
                        type = IP_ADDR_IPv6;
                    }
                }
                if(type) {
                    NSString *key = [NSString stringWithFormat:@"%@/%@", name, type];
                    addresses[key] = [NSString stringWithUTF8String:addrBuf];
                }
            }
        }
        // Free memory
        freeifaddrs(interfaces);
    }
    return [addresses count] ? addresses : nil;
}
+ (BOOL)isValidatIP:(NSString *)ipAddress {
    if (ipAddress.length == 0) {
        return NO;
    }
    NSString *urlRegEx = @"^([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
    "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
    "([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\."
    "([01]?\\d\\d?|2[0-4]\\d|25[0-5])$";

    NSError *error;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:urlRegEx options:0 error:&error];

    if (regex != nil) {
        NSTextCheckingResult *firstMatch=[regex firstMatchInString:ipAddress options:0 range:NSMakeRange(0, [ipAddress length])];

        if (firstMatch) {
            NSRange resultRange = [firstMatch rangeAtIndex:0];
            NSString *result=[ipAddress substringWithRange:resultRange];
            //输出结果
            NSLog(@"%@",result);
            return YES;
        }
    }
    return NO;
}