Add tunctl.

diff --git a/toys/net/tunctl.c b/toys/net/tunctl.c
new file mode 100644 (file)
index 0000000..c7bf892
--- /dev/null
+++ b/toys/net/tunctl.c
@@ -0,0 +1,44 @@
+/* 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);
+}