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/* tunctl.c - Control tap/tun network devices.
*
* Copyright 2016 Rob Landley <rob@landley.net>
*
* See http://kernel.org/doc/Documentation/networking/tuntap.txt
USE_TUNCTL(NEWTOY(tunctl, "<1>1t|d|u:[!td]", TOYFLAG_USR|TOYFLAG_BIN))
config TUNCTL
bool "tunctl"
default y
help
usage: tunctl [-dt] [-u USER] NAME
Create and delete tun/tap virtual ethernet devices.
A tap device Template for new commands. You don't need this.
-d Delete tun device
-t Create tun device
-u Owner of new device
*/
#define FOR_tunctl
#include "toys.h"
#include <linux/if_tun.h>
GLOBALS(
char *user;
)
void tunctl_main(void)
{
struct ifreq *ifr = (void *)toybuf;
uid_t u = TT.user ? xgetuid(TT.user) : 0;
int fd = xopen("/dev/net/tun", O_RDWR);
ifr->ifr_flags = IFF_TAP|IFF_NO_PI;
strncpy(ifr->ifr_name, *toys.optargs, sizeof(ifr->ifr_name));
xioctl(fd, TUNSETIFF, toybuf);
if (toys.optflags&FLAG_t) {
xioctl(fd, TUNSETPERSIST, (void *)1);
xioctl(fd, TUNSETOWNER, (void *)(long)u);
} else xioctl(fd, TUNSETPERSIST, (void *)0);
}
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