/* -*-c-*-
*
- * $Id: tun-unet.c,v 1.6 2004/04/08 01:36:17 mdw Exp $
+ * $Id$
*
* Tunnel interface based on Linux Usernet
*
/*----- Header files ------------------------------------------------------*/
+#define TUN_INTERNALS
+
#include "tripe.h"
-#include <sys/ioctl.h>
-#include <net/if.h>
-#include <unet.h>
+#ifdef TUN_UNET
+# include <sys/ioctl.h>
+# include <net/if.h>
+# include <unet.h>
+#endif
/*----- Main code ---------------------------------------------------------*/
-#if TUN_TYPE != TUN_UNET
-# error "Tunnel type mismatch: fix the Makefile"
-#endif
+#ifdef TUN_UNET
+
+struct tunnel {
+ const tunnel_ops *ops; /* Pointer to operations */
+ sel_file f; /* Selector for Usernet device */
+ struct peer *p; /* Pointer to my peer */
+};
+
+/* --- @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 b[UNET_NAMEMAX];
+ struct unet_info uni;
+ if (ioctl(t->f.fd, UNIOCGINFO, &uni)) {
+ a_warn("TUN - unet getinfo-error -- %s", strerror(errno));
+ return ("<error>");
+ }
+ if (strlen(uni.uni_ifname) + 1 > sizeof(b)) {
+ a_warn("TUN - unet ifname-too-long");
+ return ("<error>");
+ }
+ strcpy(b, uni.uni_ifname);
+ return (b);
+}
/* --- @t_read@ --- *
*
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 read-error -- %s", t_ifname(t), strerror(errno));
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-unet: packet arrived");
+ trace_block(T_PACKET, "tun-unet: 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
*
- * 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;
+ tunnel *t;
int f;
if ((fd = open("/dev/unet", O_RDWR)) < 0) {
- a_warn("open `/dev/unet' failed: %s", strerror(errno));
- return (-1);
+ a_warn("TUN - open-error /dev/unet -- %s", strerror(errno));
+ return (0);
}
fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
if ((f = ioctl(fd, UNIOCGIFFLAGS)) < 0 ||
ioctl(fd, UNIOCSIFFLAGS, f | IFF_POINTOPOINT)) {
- a_warn("couldn't set point-to-point flag: %s", strerror(errno));
+ a_warn("TUN - unet config-error -- %s", strerror(errno));
close(fd);
- return (-1);
+ return (0);
}
+ t = CREATE(tunnel);
+ t->ops = &tun_unet;
t->p = p;
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);
+ T( trace(T_TUNNEL, "tun-unet: attached interface %s to peer `%s'",
+ t_ifname(t), p_name(p)); )
+ return (t);
}
-/* --- @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 b[UNET_NAMEMAX];
- struct unet_info uni;
- if (ioctl(t->f.fd, UNIOCGINFO, &uni)) {
- a_warn("ioctl(UNIOCGINFO) failed: %s", strerror(errno));
- return ("<error>");
- }
- if (strlen(uni.uni_ifname) + 1 > sizeof(b)) {
- a_warn("interface name too long!");
- return ("<error>");
- }
- strcpy(b, uni.uni_ifname);
- return (b);
-}
-
-/* --- @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-unet: inject decrypted packet");
+ trace_block(T_PACKET, "tun-unet: 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_unet = {
+ "unet",
+ t_init,
+ t_create,
+ t_ifname,
+ t_inject,
+ t_destroy
+};
+
+#endif
+
/*----- That's all, folks -------------------------------------------------*/
~mdw / tripe / blobdiff