网络编程 UDP 改变网关和网卡名字
在程序里动态改变网关和网卡名字
1,改变网卡名字
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
int main(){
int fd;
ifreq ifr;
fd = socket(AF_INET, SOCK_DGRAM, 0);
strncpy(ifr.ifr_name, "lo", IFNAMSIZ - 1);
strncpy(ifr.ifr_newname, "newloname", IFNAMSIZ - 1);
if(ioctl(fd, SIOCSIFNAME, &ifr) != 0){
perror("ioctl");
return 1;
}
close(fd);
return 0;
}
github源代码
2,改变网关
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
int main(){
int fd;
ifreq ifr;
sockaddr_in *s_in;
fd = socket(AF_INET, SOCK_DGRAM, 0);
s_in = (sockaddr_in*)&ifr.ifr_addr;
s_in->sin_family = AF_INET;
inet_pton(AF_INET, "255.0.0.0", &s_in->sin_addr);
strncpy(ifr.ifr_name, "enp0s3", IFNAMSIZ - 1);
if(ioctl(fd, SIOCSIFNETMASK, &ifr) != 0){
perror("ioctl");
return 1;
}
close(fd);
return 0;
}
github源代码
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