获取Linux本地IP信息

灰太狼 2022-10-18 12:42 253阅读 0赞

#include<stdlib.h> 
    #include<stdio.h> 
    #include<unistd.h> 
    #include<net/if.h> 
    #include<net/if_arp.h> 
    #include<arpa/inet.h> 
    #include<sys/ioctl.h> 
    #include<errno.h> 
    #include <string.h>
      
    
    //  出处\src\http.c文件的setLocalHost函数, 换种方式获取ip地址 (ipv4)
    //#define ETH_NAME "eth0" 
    #define ETH_NAME "ens33" 
    
    static void get_local_ip(int sock_fd);  
    static void get_netmask_addr(int sock_fd);  
    static void get_mac_addr(int sock_fd);  
    static void get_broad_addr(int sock_fd);  
    struct sockaddr_in  sin;  
    struct sockaddr_in  netmask;  
    struct sockaddr_in  broad;  
    struct ifreq ifr;  
    unsigned char arp[6];  
    
    int main()  
    {   
    	int sockfd;  
    	//create socket  
    	sockfd = socket(AF_INET,SOCK_DGRAM,0);  
    	if (sockfd == -1)  
    	{   
    		perror("socket");  
    		return -1;  
    	}  
    
    	get_local_ip(sockfd);       /* get ip */
    	get_mac_addr(sockfd);       /* get mac */
    	get_netmask_addr(sockfd);   /* get netmask */
    	get_broad_addr(sockfd);     /* get broad addr 广播地址 */
      
    	return 0;  
    }  
    static void get_local_ip(int sock_fd)  
    {   
    	strncpy(ifr.ifr_name, ETH_NAME, IFNAMSIZ);  
    	ifr.ifr_name[IFNAMSIZ - 1] = 0;  
    	if (ioctl(sock_fd, SIOCGIFADDR, &ifr) == 0)  
    	{   
    		memcpy(&sin, &ifr.ifr_addr, sizeof(sin));  
    		fprintf(stdout,"%s: %s\n", ETH_NAME, inet_ntoa(sin.sin_addr));  
    	}  
    }  
    static void get_mac_addr(int sock_fd)  
    {   
    	if (ioctl(sock_fd,SIOCGIFHWADDR, &ifr) == 0)  
    	{   
    		memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);  
    		printf("adapter hardware address %x:%x:%x:%x:%x:%x\n", 
                                  arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);  
    	}  
    }  
    static void get_netmask_addr(int sock_fd)  
    {   
    	if (ioctl(sock_fd, SIOCGIFNETMASK,&ifr) == 0)  
    	{   
    		memcpy(&netmask,&ifr.ifr_netmask,sizeof(netmask));  
    		printf("netmask: %s\n",inet_ntoa(netmask.sin_addr));  
    	}  
    }  
    static void get_broad_addr(int sock_fd)  
    {   
    	if (ioctl(sock_fd, SIOCGIFBRDADDR, &ifr) == 0)  
    	{   
    		memcpy(&broad, &ifr.ifr_broadaddr, sizeof(broad));  
    		printf("broad: %s\n", inet_ntoa(broad.sin_addr));  
    	}  
    }