获取iOS设备当前ip地址

第一种方法是用系统api的方式获取，如下

#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() 

        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]); 

    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; 

        if_names[i] = ip_names[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, &ifc) < 0) 

        perror("ioctl error"); 

    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) 

        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; 

        hw_addrs[i] = null; 

    if (ioctl(sockfd, siocgifconf, (char *)&ifc) < 0) 

        close(sockfd); 

    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; 

                    } 

                } www.2cto.com

            } 

        cp += sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len); 

- (nsstring *)deviceipadress { 

    getipaddresses(); 

    gethwaddresses(); 

    return [nsstring stringwithformat:@"%s", ip_names[1]]; 

这样得到的ip，如果在内网中，那么就是内网的ip.

第二种方法是可以获取公网ip

- (void)getcurrentip 

    __block asihttprequest *request = [asihttprequest requestwithurl:url]; 

    [request setcompletionblock:^{ 

        nsstring *responsestring = [request responsestring]; 

        if (responsestring) { 

            nsstring *ip = [nsstring stringwithformat:@"%@", responsestring]; 

            nslog(@"responsestring = %@", ip); 

        }; 

    }]; 

    [request setfailedblock:^{ 

用到了asihttprequest这个网络开源库。

http://automation.whatismyip.com/n09230945.asp这个http url就可以获取你当前的ip地址。