擷取指定網卡的IP

#include <stdio.h>

#include <stdlib.h>

#include <error.h>

#include <string.h>

#include <netdb.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#include <unistd.h>

#include <sys/ioctl.h>

#include <arpa/inet.h>

#include <net/if_arp.h>

#include <net/if.h>

#include <arpa/inet.h>

#include "string"

using namespace std;

int getlocaip(const char *eth, unsigned &ip)

{

int sockfd;

if(-1 == (sockfd = socket(PF_INET, SOCK_STREAM, 0)))

{

perror("socket");

return -1;

}

struct ifreq req;

bzero(&req, sizeof(struct ifreq));

strcpy(req.ifr_name, eth);

if(ioctl(sockfd, SIOCGIFADDR, &req) < 0)

{

fprintf(stderr, "ioctl failed.\n");

return -1;

}

struct sockaddr_in *host;

host = (struct sockaddr_in*)&req.ifr_addr;

ip = (unsigned)host->sin_addr.s_addr;

close(sockfd);

return 0;

}

int main(int argc, char **argv)

{

unsigned ip;

string str_ip = "eth0";

unsigned ret = getlocaip(str_ip.c_str(), ip);

if(ret == 0)

{

char c_ip[16];

memset(c_ip, 0, 16);

inet_ntop(AF_INET, &ip, c_ip, 16);

printf("loca_ip:%s\n", c_ip);

}

return 0;   

}

原文

http://blog.chinaunix.net/uid-26707720-id-3297624.html

http://wenku.baidu.com/view/59f4508d680203d8ce2f2412.html###