+++ /dev/null
-/* -*-c-*-
- *
- * $Id$
- *
- * 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.
- */
-
-/*----- Header files ------------------------------------------------------*/
-
-#define TUN_INTERNALS
-
-#include "tripe.h"
-
-/*----- Main code ---------------------------------------------------------*/
-
-#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@ --- *
- *
- * 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.
- */
-
-static 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("TUN", "%s", t_ifname(t), "read-error", "?ERRNO", A_END);
- return;
- }
- IF_TRACING(T_TUNNEL, {
- 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);
-}
-
-/* --- @t_init@ --- *
- *
- * Arguments: ---
- *
- * Returns: ---
- *
- * Use: Initializes the tunneling system. Maybe this will require
- * opening file descriptors or something.
- */
-
-static void t_init(void) { return; }
-
-/* --- @t_create@ --- *
- *
- * Arguments: @peer *p@ = pointer to peer block
- *
- * Returns: A tunnel block if it worked, or null on failure.
- *
- * Use: Initializes a new tunnel.
- */
-
-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(buf, O_RDWR)) >= 0)
- break;
- switch (errno) {
- case EBUSY:
- T( trace(T_TUNNEL, "tunnel device %u busy: skipping", n); )
- break;
- case ENOENT:
- a_warn("TUN", "-", "bsd", "no-tunnel-devices", A_END);
- return (0);
- default:
- 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, "tun-bsd: attached interface %s to peer `%s'",
- t_ifname(t), p_name(p)); )
- return (t);
-}
-
-/* --- @t_inject@ --- *
- *
- * Arguments: @tunnel *t@ = pointer to tunnel block
- * @buf *b@ = buffer to send
- *
- * Returns: ---
- *
- * Use: Injects a packet into the local network stack.
- */
-
-static void t_inject(tunnel *t, buf *b)
-{
- IF_TRACING(T_TUNNEL, {
- 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));
-}
-
-/* --- @t_destroy@ --- *
- *
- * Arguments: @tunnel *t@ = pointer to tunnel block
- *
- * Returns: ---
- *
- * Use: Destroys a tunnel.
- */
-
-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 -------------------------------------------------*/
~mdw / tripe / blobdiff