iOS: 如何获取ios设备的当前IP地址

有的时候，我们项目上线后，需要根据ip地址去统计不同地区的用户情况，此时IP地址的收取显得尤其重要，一般情况下，在用户登录时去获取用户的ip是准确的，当然实时追踪ip的变化而统计是更安全可靠的。

ip地址长度现在是有区别的，分为IPv4和IPv6.IPv4地址是类似 A.B.C.D 的格式，它是32位，用\".\"分成四段，用10进制表示；而IPv6地址类似X:X:X:X:X:X:X:X的格式，它是128位的，用\":\"分成8段，用16进制表示；可见，IPv6地址空间相对于IPv4地址有了极大的扩充。

IPv4是32位地址长度
IPv6是128位地址长度

下面有两个方法，可供使用，如下：

方法一：单独创建一个c文件，写一套方法去获取

IPAddress.h：声明文件

//
//  IPAddress.h
//  IP_Test
//
//  Created by mac on 16/7/15.
//  Copyright © 2016年 xiayuanquan. All rights reserved.
//


#ifndef IPAddress_h
#define IPAddress_h

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <errno.h>
#include <net/if_dl.h>
#include <net/ethernet.h>

#define BUFFERSIZE  4000
#define MAXADDRS    32
#define min(a,b)    ((a) < (b) ? (a) : (b))
#define max(a,b)    ((a) > (b) ? (a) : (b))

extern char *if_names[MAXADDRS];
extern char *ip_names[MAXADDRS];
extern char *hw_addrs[MAXADDRS];
extern unsigned long ip_addrs[MAXADDRS];

// Function prototypes
void InitAddresses();
void FreeAddresses();
void GetIPAddresses();
void GetHWAddresses();


#endif /* IPAddress_h */

IPAddress.c：实现文件

//
//  IPAddress.c
//  IP_Test
//
//  Created by mac on 16/7/15.
//  Copyright © 2016年 xiayuanquan. All rights reserved.
//

#include "IPAddress.h"

char *if_names[MAXADDRS];
char *ip_names[MAXADDRS];
char *hw_addrs[MAXADDRS];
unsigned long ip_addrs[MAXADDRS];

static int   nextAddr = 0;

void InitAddresses()
{
int i;
for (i=0; i<MAXADDRS; ++i)
    {
        if_names[i] = ip_names[i] = hw_addrs[i] = NULL;
        ip_addrs[i] = 0;
    }
}

void FreeAddresses()
{
int i;
for (i=0; i<MAXADDRS; ++i)
    {
if (if_names[i] != 0) free(if_names[i]);
if (ip_names[i] != 0) free(ip_names[i]);
if (hw_addrs[i] != 0) free(hw_addrs[i]);
        ip_addrs[i] = 0;
    }
    InitAddresses();
}

void GetIPAddresses()
{
int                 i, len, flags;
char                buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;
struct ifconf       ifc;
struct ifreq        *ifr, ifrcopy;
struct sockaddr_in  *sin;

char temp[80];

int sockfd;

for (i=0; i<MAXADDRS; ++i)
    {
        if_names[i] = ip_names[i] = NULL;
        ip_addrs[i] = 0;
    }

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
    {
        perror("socket failed");
return;
    }

    ifc.ifc_len = BUFFERSIZE;
    ifc.ifc_buf = buffer;

if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
    {
        perror("ioctl error");
return;
    }

    lastname[0] = 0;

for (ptr = buffer; ptr < buffer + ifc.ifc_len; )
    {
        ifr = (struct ifreq *)ptr;
        len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);
        ptr += sizeof(ifr->ifr_name) + len;   // for next one in buffer

if (ifr->ifr_addr.sa_family != AF_INET)
        {
continue; // ignore if not desired address family
        }

if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL)
        {
*cptr = 0;        // replace colon will null
        }

if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0)
        {
continue; /* already processed this interface */
        }

        memcpy(lastname, ifr->ifr_name, IFNAMSIZ);

        ifrcopy = *ifr;
        ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
        flags = ifrcopy.ifr_flags;
if ((flags & IFF_UP) == 0)
        {
continue; // ignore if interface not up
        }

        if_names[nextAddr] = (char *)malloc(strlen(ifr->ifr_name)+1);
if (if_names[nextAddr] == NULL)
        {
return;
        }
        strcpy(if_names[nextAddr], ifr->ifr_name);

        sin = (struct sockaddr_in *)&ifr->ifr_addr;
        strcpy(temp, inet_ntoa(sin->sin_addr));

        ip_names[nextAddr] = (char *)malloc(strlen(temp)+1);
if (ip_names[nextAddr] == NULL)
        {
return;
        }
        strcpy(ip_names[nextAddr], temp);

        ip_addrs[nextAddr] = sin->sin_addr.s_addr;

++nextAddr;
    }

    close(sockfd);
}

void GetHWAddresses()
{
struct ifconf ifc;
struct ifreq *ifr;
int i, sockfd;
char buffer[BUFFERSIZE], *cp, *cplim;
char temp[80];

for (i=0; i<MAXADDRS; ++i)
    {
        hw_addrs[i] = NULL;
    }

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
    {
        perror("socket failed");
return;
    }

    ifc.ifc_len = BUFFERSIZE;
    ifc.ifc_buf = buffer;

if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0)
    {
        perror("ioctl error");
        close(sockfd);
return;
    }

    ifr = ifc.ifc_req;

    cplim = buffer + ifc.ifc_len;

for (cp=buffer; cp < cplim; )
    {
        ifr = (struct ifreq *)cp;
if (ifr->ifr_addr.sa_family == AF_LINK)
        {
struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
int a,b,c,d,e,f;
int i;

            strcpy(temp, (char *)ether_ntoa((const struct ether_addr *)LLADDR(sdl)));
            sscanf(temp, "%x:%x:%x:%x:%x:%x", &a, &b, &c, &d, &e, &f);
            sprintf(temp, "%02X:%02X:%02X:%02X:%02X:%02X",a,b,c,d,e,f);

for (i=0; i<MAXADDRS; ++i)
            {
if ((if_names[i] != NULL) && (strcmp(ifr->ifr_name, if_names[i]) == 0))
                {
if (hw_addrs[i] == NULL)
                    {
                        hw_addrs[i] = (char *)malloc(strlen(temp)+1);
                        strcpy(hw_addrs[i], temp);
break;
                    }
                }
            }
        }
        cp += sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len);
    }
    close(sockfd);
}

将头文件导入ViewController.m中进行测试

//
//  ViewController.m
//  IP_Test
//
//  Created by mac on 16/7/15.
//  Copyright © 2016年 xiayuanquan. All rights reserved.
//

#import "ViewController.h"
#import "IPAddress.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    [self getIPAddress];
}

//获取ip地址
- (void)getIPAddress
{
    InitAddresses();
    GetIPAddresses();
    GetHWAddresses();

int i;
//    NSString *deviceIP = nil;
for (i=0; i<MAXADDRS; ++i)
    {
static unsigned long localHost = 0x7F000001;            // 127.0.0.1
        unsigned long theAddr;

        theAddr = ip_addrs[i];

if (theAddr == 0) break;
if (theAddr == localHost) continue;

        NSLog(@"Name: %s MAC: %s IP: %s\n", if_names[i], hw_addrs[i], ip_names[i]);
    }
}

@end

测试结果：

模拟器上连接wifi：

2016-07-15 16:19:49.187 IP_Test[5674:205359] Name: lo0  MAC: 00:00:00:00:00:00  IP: 127.0.0.1
2016-07-15 16:19:49.187 IP_Test[5674:205359] Name: en1  MAC: BC:54:36:CC:9C:96  IP: 192.168.0.109

iphone上：

　　连接wifi时:

2016-07-15 17:32:08.884 IP_Test[4813:2032752] Name: lo0  MAC: 00:00:00:00:00:00  IP: 127.0.0.1
2016-07-15 17:32:08.885 IP_Test[4813:2032752] Name: pdp_ip0  MAC: 00:00:00:00:00:70  IP: 10.204.102.136
2016-07-15 17:32:08.885 IP_Test[4813:2032752] Name: en0  MAC: 02:00:00:00:00:00  IP: 192.168.0.111

　　使用4G时:

2016-07-15 17:32:44.163 IP_Test[4817:2033214] Name: lo0  MAC: 00:00:00:00:00:00  IP: 127.0.0.1
2016-07-15 17:32:44.164 IP_Test[4817:2033214] Name: pdp_ip0  MAC: 00:00:00:00:00:70  IP: 10.204.102.136

方法二：直接在ViewController.m中写获取ip地址的方法，该方法简单，而且能实时监测IP地址的变化

*参考地址为：http://*.com/questions/7072989/iphone-ipad-how-to-get-my-ip-address-programmatically

//
//  ViewController.m
//  IP_Test
//
//  Created by mac on 16/7/15.
//  Copyright © 2016年 xiayuanquan. All rights reserved.
//

#import "ViewController.h"


#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"


@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    NSLog(@"%@",[self getIPAddresses]);
}


- (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;
}

@end