获取iphone的IP地址源码

最新推荐文章于 2025-09-05 14:52:30 发布

转载最新推荐文章于 2025-09-05 14:52:30 发布 · 3.6k 阅读

文章标签：

#iphone #struct #buffer #null #interface #socket

本文介绍了一种通过C语言实现的方法来获取iPhone设备上的IP地址。该方法包括初始化、释放资源、获取IP地址及硬件地址等功能，并展示了如何在iOS应用中使用这些功能。

定义了几个方法，获取iphone的IP地址。

IPAdress.h

IPAddress.c

#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 "GetAddresses.h"  
#define min(a,b)    ((a) < (b) ? (a) : (b))  
#define max(a,b)    ((a) > (b) ? (a) : (b))  
#define BUFFERSIZE  4000  
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(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);  
}

如何用呢，我们在MyAppAppDelegate.h中如下

MyAppDelegate.m

- (void)applicationDidFinishLaunching:(UIApplication *)application {  
    self.localIP = [self deviceIPAdress];  
        ...  
}  
- (NSString *)deviceIPAdress {  
    InitAddresses();  
    GetIPAddresses();  
    GetHWAddresses();  
      
        /*  
    int i; 
    NSString *deviceIP; 
    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(@"%s %s %s/n", if_names[i], hw_addrs[i], ip_names[i]); 
    } 
    deviceIP = [NSString stringWithFormat:@"%s", ip_names[i]]; 
    */  
      
        //this will get you the right IP from your device in format like 198.111.222.444. If you use the for loop above you will se that ip_names array will also contain localhost IP 127.0.0.1 that's why I don't use it. Eventualy this was code from mac that's why it uses arrays for ip_names as macs can have multiple IPs  
    return [NSString stringWithFormat:@"%s", ip_names[1]];  
}