From: mdw <mdw>
Date: Mon, 5 Feb 2001 19:48:18 +0000 (+0000)
Subject: Initial support for BSD tunnel devices.
X-Git-Tag: 1.0.0pre1~34
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/tripe/commitdiff_plain/fd528bdeb067dc6450ef8e795824539181e097d5?ds=sidebyside

Initial support for BSD tunnel devices.
---

diff --git a/Makefile.am b/Makefile.am
index afbee21d..f77fc6b4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 ## -*-makefile-*-
 ##
-## $Id: Makefile.am,v 1.1 2001/02/03 20:26:37 mdw Exp $
+## $Id: Makefile.am,v 1.2 2001/02/05 19:48:18 mdw Exp $
 ##
 ## Makefile for TrIPE
 ##
@@ -28,6 +28,9 @@
 ##----- Revision history ----------------------------------------------------
 ##
 ## $Log: Makefile.am,v $
+## Revision 1.2  2001/02/05 19:48:18  mdw
+## Initial support for BSD tunnel devices.
+##
 ## Revision 1.1  2001/02/03 20:26:37  mdw
 ## Initial checkin.
 ##
@@ -42,7 +45,10 @@ tripe_SOURCES = \
 	admin.c peer.c tun-$(tun).c \
 	keymgmt.c keyexch.c keyset.c \
 	buf.c servutil.c util.c util.h
+EXTRA_tripe_SOURCES = \
+	tun-unet.c tun-bsd.c
 tripectl_SOURCES = \
 	client.c util.c util.h
+	tun-unet.c tun-bsd.c
 
 ##----- That's all, folks ---------------------------------------------------
diff --git a/tun-bsd.c b/tun-bsd.c
new file mode 100644
index 00000000..39e3e108
--- /dev/null
+++ b/tun-bsd.c
@@ -0,0 +1,185 @@
+/* -*-c-*-
+ *
+ * $Id: tun-bsd.c,v 1.1 2001/02/05 19:48:18 mdw Exp $
+ *
+ * Tunnel interface for 4.4BSD-derived systems
+ *
+ * (c) 2001 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------* 
+ *
+ * This file is part of Trivial IP Encryption (TrIPE).
+ *
+ * TrIPE is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * TrIPE is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with TrIPE; if not, write to the Free Software Foundation,
+ * 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 ------------------------------------------------------*/
+
+#include "tripe.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+#if TUN_TYPE != TUN_BSD
+#  error "Tunnel type mismatch: fix the Makefile"
+#endif
+
+/* --- @t_read@ --- *
+ *
+ * Arguments:	@int fd@ = file descriptor to read
+ *		@unsigned mode@ = what's happened
+ *		@void *v@ = pointer to tunnel block
+ *
+ * Returns:	---
+ *
+ * Use:		Reads data from the tunnel.
+ */
+
+void t_read(int fd, unsigned mode, void *v)
+{
+  tunnel *t = v;
+  ssize_t n;
+  buf b;
+
+  n = read(fd, buf_i, sizeof(buf_i));
+  if (n < 0) {
+    a_warn("tunnel read failed (%s): %s", tun_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);
+  })
+  buf_init(&b, buf_i, n);
+  p_tun(t->p, &b);
+}
+
+/* --- @tun_init@ --- *
+ *
+ * Arguments:	---
+ *
+ * Returns:	---
+ *
+ * Use:		Initializes the tunneling system.  Maybe this will require
+ *		opening file descriptors or something.
+ */
+
+void tun_init(void)
+{
+  return;
+}
+
+/* --- @tun_create@ --- *
+ *
+ * Arguments:	@tunnel *t@ = pointer to tunnel block
+ *		@peer *p@ = pointer to peer block
+ *
+ * Returns:	Zero if it worked, nonzero on failure.
+ *
+ * Use:		Initializes a new tunnel.
+ */
+
+int tun_create(tunnel *t, peer *p)
+{
+  int fd;
+  unsigned n;
+  char buf[16];
+
+  n = 0;
+  for (;;) {
+    sprintf(buf, "/dev/tun%u", n);
+    if ((fd = open("/dev/unet", 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);
+      default:
+	a_warn("error opening `%s': %s (skipping)", buf, strerror(errno));
+	break;
+    }
+    n++;
+  }
+
+  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);
+}
+
+/* --- @tun_inject@ --- *
+ *
+ * Arguments:	@tunnel *t@ = pointer to tunnel block
+ *		@buf *b@ = buffer to send
+ *
+ * Returns:	---
+ *
+ * Use:		Injects a packet into the local network stack.
+ */
+
+void tun_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));
+  })
+  write(t->f.fd, BBASE(b), BLEN(b));
+}
+
+/* --- @tun_destroy@ --- *
+ *
+ * Arguments:	@tunnel *t@ = pointer to tunnel block
+ *
+ * Returns:	---
+ *
+ * Use:		Destroys a tunnel.
+ */
+
+void tun_destroy(tunnel *t)
+{
+  sel_rmfile(&t->f);
+  close(t->f.fd);
+}
+
+/*----- That's all, folks -------------------------------------------------*/