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-rw-r--r--toys/net/tunctl.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/toys/net/tunctl.c b/toys/net/tunctl.c
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+++ b/toys/net/tunctl.c
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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);
+}