set_addr.c

来自「一个基于linux的TCP/IP协议栈的实现」· C语言 代码 · 共 67 行

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/if.h>
#include "my_inet.h"
#include <stdio.h>
#include <errno.h>
#include <string.h>

int main()
{
	struct ifreq req;
	strncpy( req.ifr_name, "eth0:0", IFNAMSIZ );
	struct sockaddr_in *sin;

	int fd = socket( MY_PF_INET, SOCK_RAW, MY_IPPROTO_ICMP );
	if( fd < 0 ){
		perror("error: ");
		return -1;
	}

	sin = (struct sockaddr_in *)&req.ifr_addr;
	sin->sin_family = MY_PF_INET;
	if( inet_aton("172.16.48.13", &sin->sin_addr) == 0 ){
		perror("inet_aton error: ");
		return -1;
	}

	if( ioctl( fd, SIOCSIFADDR, &req ) == 0 ){
		printf("success!\n");
	}else{
		perror("ioctl failed: ");
	}

	req.ifr_flags = IFF_UP;
	if( ioctl( fd, SIOCSIFFLAGS, &req ) == 0 ){
		printf("success!\n");
	}else{
		perror("ioctl failed: ");
	}
	
	sin->sin_family = MY_PF_INET;
	if( inet_aton("172.16.48.255", &sin->sin_addr) == 0 ){
		perror("inet_aton error: ");
		return -1;
	}
	if( ioctl( fd, SIOCSIFBRDADDR, &req ) == 0 ){
		printf("success!\n");
	}else{
		perror("ioctl failed: ");
	}

	sin->sin_family = MY_PF_INET;
    if( inet_aton("255.255.255.0", &sin->sin_addr) == 0 ){
        perror("inet_aton error: ");
        return -1;
    }
    if( ioctl( fd, SIOCSIFNETMASK, &req ) == 0 ){
        printf("success!\n");
    }else{
        perror("ioctl failed: ");
    }

	close( fd );
	return 0;
}