获取ethx 接口的IP地址

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获取ethx 接口的IP地址

#include <stdio.h>#include <unistd.h>#include <arpa/inet.h>#include <stdlib.h>#include <sys/ioctl.h>#include <sys/types.h>#include <sys/socket.h>#include <net/if.h>#include <string.h>#define MAXINTERFACES 16#define MAC_ADDR_LEN 18#define ADDR_LEN 16#define ETH_INTERFACE_NAME "eth"void err_quit(char *msg);void getIP(char *addr);int main(int argc, char *argv[]){        char addr[ADDR_LEN] = {0,};        getIP(addr);        printf("%s\n", addr);        return 0;}void err_quit(char *msg){        perror(msg);        exit(1);}void getIP(char *addr){        int sock_fd;        struct ifreq buf[MAXINTERFACES];        struct ifconf ifc;        int inter_num;        char *temp = NULL;        if((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)                err_quit("Create socket failed");        ifc.ifc_len = sizeof(buf);        ifc.ifc_req = buf;        if(ioctl(sock_fd, SIOCGIFCONF, (char *)&ifc) < 0)                err_quit("Get a list of interface addresses failed");        inter_num = ifc.ifc_len / sizeof(struct ifreq);        printf("The number of interfaces is %d\n", inter_num);        while(inter_num--) {                if(strstr(buf[inter_num].ifr_name, ETH_INTERFACE_NAME) == NULL)                        continue;                if(ioctl(sock_fd, SIOCGIFADDR, (char *)&buf[inter_num]) < 0)                        err_quit("Get interface address failed");                temp = inet_ntoa(((struct sockaddr_in*)(&buf[inter_num].ifr_addr))->sin_addr);                strncpy(addr, temp, ADDR_LEN);                printf("IP address is %s\n", addr);        }}

转载自：http://blog.chinaunix.net/uid-30441-id-2133844.html