+++ /dev/null
-/* -*-c-*-
- *
- * $Id$
- *
- * Tunnel interface based on Linux TUN/TAP driver
- *
- * (c) 2003 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"
-
-#ifdef TUN_LINUX
-# include <sys/ioctl.h>
-# include <linux/if.h>
-# include <linux/if_tun.h>
-#endif
-
-/*----- Main code ---------------------------------------------------------*/
-
-#ifdef TUN_LINUX
-
-struct tunnel {
- const tunnel_ops *ops; /* Pointer to operations */
- sel_file f; /* Selector for TUN/TAP device */
- struct peer *p; /* Pointer to my peer */
- char ifn[IFNAMSIZ]; /* Interface name buffer */
-};
-
-/* --- @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->ifn, "read-error", "?ERRNO", A_END);
- return;
- }
- IF_TRACING(T_TUNNEL, {
- trace(T_TUNNEL, "tun-linux: packet arrived");
- trace_block(T_PACKET, "tun-linux: 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;
- int f;
- struct ifreq iff;
- tunnel *t;
-
- if ((fd = open("/dev/net/tun", O_RDWR)) < 0) {
- a_warn("TUN", "-", "linux",
- "open-error", "/dev/net/tun", "?ERRNO",
- A_END);
- return (0);
- }
- fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
- memset(&iff, 0, sizeof(iff));
- iff.ifr_name[0] = 0;
- iff.ifr_flags = IFF_TUN | IFF_NO_PI;
- if ((f = ioctl(fd, TUNSETIFF, &iff)) < 0) {
- a_warn("TUN", "-", "linux", "config-error", "?ERRNO", A_END);
- close(fd);
- return (0);
- }
- t = CREATE(tunnel);
- t->ops = &tun_linux;
- t->p = p;
- sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
- sel_addfile(&t->f);
- iff.ifr_name[IFNAMSIZ - 1] = 0;
- strcpy(t->ifn, iff.ifr_name);
- T( trace(T_TUNNEL, "tun-linux: attached interface %s to peer `%s'",
- t->ifn, p_name(p)); )
- return (t);
-}
-
-/* --- @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) { return (t->ifn); }
-
-/* --- @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-linux: inject decrypted packet");
- trace_block(T_PACKET, "tunnel: 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_linux = {
- "linux",
- t_init,
- t_create,
- t_ifname,
- t_inject,
- t_destroy
-};
-
-#endif
-
-/*----- That's all, folks -------------------------------------------------*/
~mdw / tripe / blobdiff