/* -*-c-*-
*
- * $Id: tun-bsd.c,v 1.1 2001/02/05 19:48:18 mdw Exp $
+ * $Id$
*
* Tunnel interface for 4.4BSD-derived systems
*
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: tun-bsd.c,v $
- * Revision 1.1 2001/02/05 19:48:18 mdw
- * Initial support for BSD tunnel devices.
- *
- */
-
/*----- Header files ------------------------------------------------------*/
+#define TUN_INTERNALS
+
#include "tripe.h"
/*----- Main code ---------------------------------------------------------*/
-#if TUN_TYPE != TUN_BSD
-# error "Tunnel type mismatch: fix the Makefile"
-#endif
+#ifdef TUN_BSD
+
+struct tunnel {
+ const tunnel_ops *ops; /* Pointer to operations */
+ sel_file f; /* Selector for tunnel device */
+ struct peer *p; /* Pointer to my peer */
+ unsigned n; /* Number of my tunnel device */
+};
+
+/* --- @t_ifname@ --- *
+ *
+ * Arguments: @tunnel *t@ = pointer to tunnel block
+ *
+ * Returns: A pointer to the tunnel's interface name.
+ */
+
+static const char *t_ifname(tunnel *t)
+{
+ static char buf[8];
+ sprintf(buf, "tun%u", t->n);
+ return (buf);
+}
/* --- @t_read@ --- *
*
* Use: Reads data from the tunnel.
*/
-void t_read(int fd, unsigned mode, void *v)
+static void t_read(int fd, unsigned mode, void *v)
{
tunnel *t = v;
ssize_t n;
n = read(fd, buf_i, sizeof(buf_i));
if (n < 0) {
- a_warn("tunnel read failed (%s): %s", tun_ifname(t), strerror(errno));
+ a_warn("TUN", "%s", t_ifname(t), "read-error", "?ERRNO", A_END);
return;
}
IF_TRACING(T_TUNNEL, {
- trace(T_TUNNEL, "tunnel: packet arrived");
- trace_block(T_PACKET, "tunnel: packet contents", buf_i, n);
+ trace(T_TUNNEL, "tun-bsd: packet arrived");
+ trace_block(T_PACKET, "tun-bsd: packet contents", buf_i, n);
})
buf_init(&b, buf_i, n);
p_tun(t->p, &b);
}
-/* --- @tun_init@ --- *
+/* --- @t_init@ --- *
*
* Arguments: ---
*
* opening file descriptors or something.
*/
-void tun_init(void)
-{
- return;
-}
+static void t_init(void) { return; }
-/* --- @tun_create@ --- *
+/* --- @t_create@ --- *
*
- * Arguments: @tunnel *t@ = pointer to tunnel block
- * @peer *p@ = pointer to peer block
+ * Arguments: @peer *p@ = pointer to peer block
*
- * Returns: Zero if it worked, nonzero on failure.
+ * Returns: A tunnel block if it worked, or null on failure.
*
* Use: Initializes a new tunnel.
*/
-int tun_create(tunnel *t, peer *p)
+static tunnel *t_create(peer *p)
{
int fd;
unsigned n;
+ tunnel *t;
char buf[16];
n = 0;
for (;;) {
sprintf(buf, "/dev/tun%u", n);
- if ((fd = open("/dev/unet", O_RDWR)) >= 0)
+ if ((fd = open(buf, O_RDWR)) >= 0)
break;
switch (errno) {
case EBUSY:
T( trace(T_TUNNEL, "tunnel device %u busy: skipping", n); )
break;
case ENOENT:
- a_warn("no suitable tunnel devices found");
- return (-1);
+ a_warn("TUN", "-", "bsd", "no-tunnel-devices", A_END);
+ return (0);
default:
- a_warn("error opening `%s': %s (skipping)", buf, strerror(errno));
+ a_warn("TUN", "-", "open-error", "%s", buf, "?ERRNO", A_END);
break;
}
n++;
}
+ t = CREATE(tunnel);
+ t->ops = &tun_bsd;
fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
t->p = p;
t->n = n;
sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
sel_addfile(&t->f);
- T( trace(T_TUNNEL, "tunnel: attached interface %s to peer `%s'",
- tun_ifname(t), p_name(p)); )
- return (0);
-}
-
-/* --- @tun_ifname@ --- *
- *
- * Arguments: @tunnel *t@ = pointer to tunnel block
- *
- * Returns: A pointer to the tunnel's interface name.
- */
-
-const char *tun_ifname(tunnel *t)
-{
- static char buf[8];
- sprintf(buf, "tun%u", t->n);
- return (buf);
+ T( trace(T_TUNNEL, "tun-bsd: attached interface %s to peer `%s'",
+ t_ifname(t), p_name(p)); )
+ return (t);
}
-/* --- @tun_inject@ --- *
+/* --- @t_inject@ --- *
*
* Arguments: @tunnel *t@ = pointer to tunnel block
* @buf *b@ = buffer to send
* Use: Injects a packet into the local network stack.
*/
-void tun_inject(tunnel *t, buf *b)
+static void t_inject(tunnel *t, buf *b)
{
IF_TRACING(T_TUNNEL, {
- trace(T_TUNNEL, "tunnel: inject decrypted packet");
- trace_block(T_PACKET, "tunnel: packet contents", BBASE(b), BLEN(b));
+ trace(T_TUNNEL, "tun-bsd: inject decrypted packet");
+ trace_block(T_PACKET, "tun-bsd: packet contents", BBASE(b), BLEN(b));
})
write(t->f.fd, BBASE(b), BLEN(b));
}
-/* --- @tun_destroy@ --- *
+/* --- @t_destroy@ --- *
*
* Arguments: @tunnel *t@ = pointer to tunnel block
*
* Use: Destroys a tunnel.
*/
-void tun_destroy(tunnel *t)
+static void t_destroy(tunnel *t)
{
sel_rmfile(&t->f);
close(t->f.fd);
+ DESTROY(t);
}
+const tunnel_ops tun_bsd = {
+ "bsd",
+ t_init,
+ t_create,
+ t_ifname,
+ t_inject,
+ t_destroy
+};
+
+#endif
+
/*----- That's all, folks -------------------------------------------------*/