Xcode 获取本地IP

 //
 //  GetIPAddress.h //
 //

 #define MAXADDRS    32  

 extern char *ip_names[MAXADDRS];  

 void InitAddresses();
 void GetIPAddresses();
 void GetHWAddresses();  

//
//  GetIPAddress.m//

#include "GetIPAddress.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/ethernet.h>
#include <net/if.h>
#include <errno.h>
#include <net/if_dl.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 = ;  

void InitAddresses();
void FreeAddresses();
void GetIPAddresses();
void GetHWAddresses();

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

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

    int sockfd;  

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

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

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

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

    lastname[] = ;
    nextAddr = ;
    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 = ;        // replace colon will null
        }  

        if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == )  {
            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) == )  {
            continue;    // ignore if interface not up
        }  

        if_names[nextAddr] = (char *)malloc(strlen(ifr->ifr_name)+);
        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)+);
        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[];  

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

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

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

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

    close(sockfd);
}