「Objective-C」iosデバイスのIPアドレスを取得する方法

参考コード:
#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; // 次のバッファ
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; // コロンを交換してnull結果
}
if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0)
{
continue; /* インタフェースを処理済み */
}
memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
ifrcopy = *ifr;
ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
flags = ifrcopy.ifr_flags;
if ((flags & IFF_UP) == 0)
{
continue; //インターフェースを無視
}
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エラー”);
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);
}
– (NSString *)deviceIPAdress {
InitAddresses();
GetIPAddresses();
GetHWAddresses();
return [NSString stringWithFormat:@”%s”, ip_names[1]];
}

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