C语言获取本地所有网卡的ip地址及MAC信息

　　本程序在ubuntu下运行成功，后再centos系统下也能编译成功并运行。源代码如下
　　

// demo01.c#include <stdio.h>#include <stdlib.h>#include <string.h>#include <errno.h>#include <unistd.h>#include <netdb.h>#include <net/if.h>#include <arpa/inet.h>#include <sys/ioctl.h>#include <sys/types.h>#include <sys/socket.h>#define MAC_SIZE    18#define IP_SIZE     16// function declareint get_ip_by_domain(const char *domain, char *ip); // 根据域名获取ipint get_local_mac(const char *eth_inf, char *mac); // 获取本机macint get_local_ip(const char *eth_inf, char *ip); // 获取本机ip/****** main test **********/int main(void){    char ip[IP_SIZE];    char mac[MAC_SIZE];    //get all the information of interface    int sockfd;    struct ifconf ifconf;    struct ifreq *ifreq;    char buf[512];    ifconf.ifc_len=512;    ifconf.ifc_buf=buf;    if( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 )    {        perror("socket");        exit(1);    }    ioctl(sockfd, SIOCGIFCONF, &ifconf);    ifreq = (struct ifreq*)ifconf.ifc_buf;    int i=0;    printf("                        local ip&mac information\n");    printf("=======================================================================\n");    printf("    name                     ip                        mac      \n");    for(i=(ifconf.ifc_len/sizeof(struct ifreq)); i>0; i--)    {        if(ifreq->ifr_flags == AF_INET)        {            get_local_mac(ifreq->ifr_name, mac);            get_local_ip(ifreq->ifr_name, ip);            printf("    %-10s           %-20s   %-20s \n",ifreq->ifr_name, ip, mac);            ifreq++;        }    }    printf("=======================================================================\n");    return 0;}// get the ip address by domainint get_ip_by_domain(const char *domain, char *ip){    char **pptr;    struct hostent *hptr;    hptr = gethostbyname(domain);    if(NULL == hptr)    {        printf("gethostbyname error for host:%s/n", domain);        return -1;    }    for(pptr = hptr->h_addr_list ; *pptr != NULL; pptr++)    {        if (NULL != inet_ntop(hptr->h_addrtype, *pptr, ip, IP_SIZE) )        {            return 0; // 只获取第一个 ip        }    }    return -1;}// get the local host mac addressint get_local_mac(const char *eth_inf, char *mac){    struct ifreq ifr;    int sd;    bzero(&ifr, sizeof(struct ifreq));    if( (sd = socket(AF_INET, SOCK_STREAM, 0)) < 0)    {        printf("get %s mac address socket creat error\n", eth_inf);        return -1;    }    strncpy(ifr.ifr_name, eth_inf, sizeof(ifr.ifr_name) - 1);    if(ioctl(sd, SIOCGIFHWADDR, &ifr) < 0)    {        printf("get %s mac address error\n", eth_inf);        close(sd);        return -1;    }    snprintf(mac, MAC_SIZE, "%02x:%02x:%02x:%02x:%02x:%02x",        (unsigned char)ifr.ifr_hwaddr.sa_data[0],         (unsigned char)ifr.ifr_hwaddr.sa_data[1],        (unsigned char)ifr.ifr_hwaddr.sa_data[2],         (unsigned char)ifr.ifr_hwaddr.sa_data[3],        (unsigned char)ifr.ifr_hwaddr.sa_data[4],        (unsigned char)ifr.ifr_hwaddr.sa_data[5]);    close(sd);    return 0;}// get the local host ip addressint get_local_ip(const char *eth_inf, char *ip){    int sd;    struct sockaddr_in sin;    struct ifreq ifr;    sd = socket(AF_INET, SOCK_DGRAM, 0);    if (-1 == sd)    {        printf("socket error: %s\n", strerror(errno));        return -1;          }    strncpy(ifr.ifr_name, eth_inf, IFNAMSIZ);    ifr.ifr_name[IFNAMSIZ - 1] = 0;    // if error: No such device    if (ioctl(sd, SIOCGIFADDR, &ifr) < 0)    {        printf("ioctl error: %s\n", strerror(errno));        close(sd);        return -1;    }    memcpy(&sin, &ifr.ifr_addr, sizeof(sin));    snprintf(ip, IP_SIZE, "%s", inet_ntoa(sin.sin_addr));    close(sd);    return 0;}

编译脚本如下：

#This is the makefile of EpollTest.PHONY:allall:demo01server:    gcc demo01.c -o demo01clean:    rm -f demo01

结果如下：