获取本地ip，mac地址---Linux C_linux c 获取本机ip mac-优快云博客

本文链接：https://blog.youkuaiyun.com/wml45454545/article/details/84850973

/*------------------------------------------------------------------

Filename : getLocalIP.c
CreateTime : 2018-05-28 17:15
Author : tobiu
Description : get local ip
------------------------------------------------------------------*/
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <unistd.h>

#define IF_NAME “ens33” //network port

/*************************************

@Function : get_local_ip
@param :
```
  ifname	:	network port
```
```
  ip 		:	store data
```
@Description : get local ip
*************************************/
int get_local_ip(char *ifname,char *ip)
{
char *temp = NULL;
int inet_sock;
struct ifreq ifr;

inet_sock = socket(AF_INET,SOCK_DGRAM,0);

memset(ifr.ifr_name,0,sizeof(ifr.ifr_name));
memcpy(ifr.ifr_name,ifname,strlen(ifname));

if(0 != ioctl(inet_sock,SIOCGIFADDR,&ifr))
{
perror(“ioctl error!”);
return 1;
}

temp = inet_ntoa(((struct sockaddr_in*)&(ifr.ifr_addr))->sin_addr);
memcpy(ip,temp,strlen(temp));

close(inet_sock);

return 0;

}

int main(int argc, char const argv[])
{
/ code */
char ip[32] = {0};
get_local_ip(IF_NAME,ip);

if(0 != strcmp(ip,""))
{
	printf("%s ip is : %s \n",IF_NAME,ip );
}
return 0;

}

作者：Tobiu
来源：优快云
原文：https://blog.youkuaiyun.com/localhostcom/article/details/80485165
版权声明：本文为博主原创文章，转载请附上博文链接！
在这里插入图片描述
获得mac地址：
int get_local_mac(unsigned char mac) {
/ get mac interface */
struct ifreq ifreq;
int sock;

if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
	perror("create socket falied...\r\n");
	return -1;
}
//strcpy(ifreq.ifr_name, "ens33");
strcpy(ifreq.ifr_name, "eth0");
if (ioctl(sock, SIOCGIFHWADDR, &ifreq) < 0) {
	perror("mac ioctl error:");
	return -1;
}
memcpy(mac, ifreq.ifr_hwaddr.sa_data, 6);

printf("%02x:%02x:%02x:%02x:%02x:%02x\n ", (unsigned char) ifreq.ifr_hwaddr.sa_data[0], (unsigned char) ifreq.ifr_hwaddr.sa_data[1], (unsigned char) ifreq.ifr_hwaddr.sa_data[2],
		(unsigned char) ifreq.ifr_hwaddr.sa_data[3], (unsigned char) ifreq.ifr_hwaddr.sa_data[4], (unsigned char) ifreq.ifr_hwaddr.sa_data[5]);

close(sock);
return 0;

}

作者：Tobiu
来源：优快云
原文：https://blog.youkuaiyun.com/localhostcom/article/details/80485165
版权声明：本文为博主原创文章，转载请附上博文链接！
使用到的是结构体：struct ifreq；
struct ifreq
{
#define IFHWADDRLEN 6
union
{
char ifrn_name[IFNAMSIZ];
} ifr_ifrn;

union {
struct sockaddr ifru_addr;
struct sockaddr ifru_dstaddr;
struct sockaddr ifru_broadaddr;
struct sockaddr ifru_netmask;
struct sockaddr ifru_hwaddr;
short ifru_flags;
int ifru_ivalue;
int ifru_mtu;
struct ifmap ifru_map;
char ifru_slave[IFNAMSIZ];
char ifru_newname[IFNAMSIZ];
void __user * ifru_data;
struct if_settings ifru_settings;
} ifr_ifru;
};