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()

{

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);

}

- (NSString *)deviceIPAdress {

InitAddresses();

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

{

NSURL *url = [NSURL URLWithString:@"http://automation.whatismyip.com/n09230945.asp"];

__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。