#include <stdio.h> #include <stdlib.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <net/if.h> #include <sys/ioctl.h> int main(int argc, char *argv[]) { int inet_sock; struct ifreq ifr; //建立套接字 inet_sock = socket(AF_INET, SOCK_DGRAM, 0); //获得接口地址 bzero(&ifr, sizeof(ifr)); strcpy(ifr.ifr_name, "eth0"); if (ioctl(inet_sock, SIOCGIFADDR, &ifr) < 0) perror("ioctl"); printf("host:%s/n", inet_ntoa(((struct sockaddr_in*)&(ifr.ifr_addr))->sin_addr)); //获得广播地址 bzero(&ifr, sizeof(ifr)); strcpy(ifr.ifr_name, "eth0"); if (ioctl(inet_sock, SIOCGIFBRDADDR, &ifr) < 0) perror("ioctl"); printf("broadcast:%s/n", inet_ntoa(((struct sockaddr_in*)&(ifr.ifr_addr))->sin_addr)); return 0; }