这个改ip的程序怎么不能用？ - Chinaunix

/*
* changeIP.c : simple change ip address tool.
* author : r00tclown <rootclown@163.com>;
* creation : 05/8/14
* compile : gcc changeIP.c -o changeIP
* gcc 3.3.5
* kernel 2.6.8-2-686
*/
#include<unistd.h>;
#include<sys/types.h>;
#include<sys/socket.h>;
#include<sys/ioctl.h>;
#include<netinet/in.h>;
#include<arpa/inet.h>;
#include<linux/if.h>;
void change_ip(char *);
void err_quit(char *);
void usage(void);
main(int argc,char *argv[])
{
if(argc!=2)
{
usage();
exit(0);
}
change_ip(argv[1]);
}
void change_ip(char *newip)
{
int sock;
struct ifreq ifr,sifr;
struct sockaddr_in *sin;
char *dev="eth0";
if((sock=socket(AF_INET,SOCK_DGRAM,0))<0)
err_quit("socket");
memset(&ifr,0,sizeof(struct ifreq));
strcpy(ifr.ifr_name,dev);
if(ioctl(sock,SIOCGIFADDR,&ifr)<0) /*get original ip address*/
err_quit("ioctl");
sin=(struct sockaddr_in *)&ifr.ifr_addr;
printf("the original ip address:%s\n",inet_ntoa(sin->;sin_addr));
// memset(&ifr,0,sizeof(ifr));
if(!inet_aton(newip,&sin->;sin_addr)<0)
err_quit("inet_aton");
// sin->;sin_family=AF_INET;
// sin->;sin_port=0;
if(ioctl(sock,SIOCSIFADDR,&ifr)<0) /*set new ip address*/
err_quit("3 ioctl");
if(ioctl(sock,SIOCGIFFLAGS,&ifr)<0)
err_quit("ioctl");
ifr.ifr_flags|=IFF_UP;
if(ioctl(sock,SIOCSIFFLAGS,&ifr)<0)
err_quit("4 iotcl");
if(ioctl(sock,SIOCGIFADDR,&ifr)<0) /*check that we are right*/
err_quit("5 ioctl");
printf("current ip address :%s\n",inet_ntoa(sin->;sin_addr));
close(sock);
}
void err_quit(char *msg)
{
perror(msg);
exit(1);
}
void usage(void)
{
printf("changeIP : change ip address \n\
usage : changeIP <IP you wanted>;\n");
}

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