main.c

用ioctl来修改本地ip和netmask

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>

int main()
{
    struct ifreq req;
    strncpy(req.ifr_name, "eth0", IFNAMSIZ );
    struct sockaddr_in *sin;
    
    int fd = socket(AF_INET, SOCK_DGRAM, 0 );
    if( fd < 0 )
    {
        perror("error: ");
        return -1;
    }
    
    sin = (struct sockaddr_in *)&req.ifr_addr;
    sin->sin_family = AF_INET;
    
    if( inet_aton("172.16.48.10", &sin->sin_addr) == 0 ){
        perror("inet_aton error: ");
        return -1;
    }
    if( ioctl( fd, SIOCSIFADDR, &req ) == 0 ){
        printf("set ip success!\n");
    }else{
        perror("ioctl failed: ");
    }
    
    req.ifr_flags = IFF_UP;
    if( ioctl( fd, SIOCSIFFLAGS, &req ) == 0 ){
        printf("set flags success!\n");
    }else{
        perror("ioctl failed: ");
    }
    
    sin->sin_family = AF_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("set broadcast ip success!\n");
    }else{
        perror("ioctl failed: ");
    }
    
    sin->sin_family = AF_INET;
    if( inet_aton("255.255.0.0", &sin->sin_addr) == 0 ){
        perror("inet_aton error: ");
        return -1;
    }
    if( ioctl( fd, SIOCSIFNETMASK, &req ) == 0 ){
        printf("set netmask success!\n");
    }else{
        perror("ioctl failed: ");
    }
    close( fd );
    return 0;
}