chiark / gitweb /
server/tests.at: Fix TRIPECTL_INTERACT argument order.
[tripe] / server / tun-unet.c
CommitLineData
410c8acf 1/* -*-c-*-
2 *
410c8acf 3 * Tunnel interface based on Linux Usernet
4 *
5 * (c) 2001 Straylight/Edgeware
6 */
7
e04c2d50 8/*----- Licensing notice --------------------------------------------------*
410c8acf 9 *
10 * This file is part of Trivial IP Encryption (TrIPE).
11 *
12 * TrIPE is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
e04c2d50 16 *
410c8acf 17 * TrIPE is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
e04c2d50 21 *
410c8acf 22 * You should have received a copy of the GNU General Public License
23 * along with TrIPE; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 */
26
410c8acf 27/*----- Header files ------------------------------------------------------*/
28
42da2a58 29#define TUN_INTERNALS
30
410c8acf 31#include "tripe.h"
32
42da2a58 33#ifdef TUN_UNET
34# include <sys/ioctl.h>
388e0319 35# include <linux/if.h>
42da2a58 36# include <unet.h>
37#endif
410c8acf 38
39/*----- Main code ---------------------------------------------------------*/
40
42da2a58 41#ifdef TUN_UNET
42
43struct tunnel {
44 const tunnel_ops *ops; /* Pointer to operations */
45 sel_file f; /* Selector for Usernet device */
46 struct peer *p; /* Pointer to my peer */
47};
48
410c8acf 49/* --- @t_read@ --- *
50 *
51 * Arguments: @int fd@ = file descriptor to read
52 * @unsigned mode@ = what's happened
53 * @void *v@ = pointer to tunnel block
54 *
55 * Returns: ---
56 *
57 * Use: Reads data from the tunnel.
58 */
59
60a837d8 60static void t_read(int fd, unsigned mode, void *v)
410c8acf 61{
62 tunnel *t = v;
63 ssize_t n;
64 buf b;
65
66 n = read(fd, buf_i, sizeof(buf_i));
67 if (n < 0) {
b476642f
MW
68 a_warn("TUN", "%s", p_ifname(t->p), "unet",
69 "read-error", "?ERRNO", A_END);
410c8acf 70 return;
71 }
72 IF_TRACING(T_TUNNEL, {
060ca767 73 trace(T_TUNNEL, "tun-unet: packet arrived");
74 trace_block(T_PACKET, "tun-unet: packet contents", buf_i, n);
410c8acf 75 })
76 buf_init(&b, buf_i, n);
77 p_tun(t->p, &b);
78}
79
42da2a58 80/* --- @t_init@ --- *
410c8acf 81 *
82 * Arguments: ---
83 *
84 * Returns: ---
85 *
86 * Use: Initializes the tunneling system. Maybe this will require
87 * opening file descriptors or something.
88 */
89
42da2a58 90static void t_init(void) { return; }
410c8acf 91
eb5f3fea
MW
92/* --- @t_create@ --- *
93 *
94 * Arguments: @peer *p@ = pointer to peer block
95 * @int fd@ = file descriptor of tunnel device
96 * @char **ifn@ = where to put the interface name
97 *
98 * Returns: A tunnel block if it worked, or null on failure.
99 *
100 * Use: Initializes a new tunnel.
101 */
102
103static tunnel *t_create(peer *p, int fd, char **ifn)
104{
105 tunnel *t;
106
107 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
42da2a58 108 t = CREATE(tunnel);
109 t->ops = &tun_unet;
410c8acf 110 t->p = p;
111 sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
112 sel_addfile(&t->f);
42da2a58 113 return (t);
410c8acf 114}
115
42da2a58 116/* --- @t_inject@ --- *
410c8acf 117 *
118 * Arguments: @tunnel *t@ = pointer to tunnel block
119 * @buf *b@ = buffer to send
120 *
121 * Returns: ---
122 *
123 * Use: Injects a packet into the local network stack.
124 */
125
42da2a58 126static void t_inject(tunnel *t, buf *b)
410c8acf 127{
3fe0fc3a
MW
128 int hunoz;
129
410c8acf 130 IF_TRACING(T_TUNNEL, {
060ca767 131 trace(T_TUNNEL, "tun-unet: inject decrypted packet");
132 trace_block(T_PACKET, "tun-unet: packet contents", BBASE(b), BLEN(b));
410c8acf 133 })
3fe0fc3a 134 hunoz = write(t->f.fd, BBASE(b), BLEN(b));
410c8acf 135}
136
42da2a58 137/* --- @t_destroy@ --- *
410c8acf 138 *
139 * Arguments: @tunnel *t@ = pointer to tunnel block
140 *
141 * Returns: ---
142 *
143 * Use: Destroys a tunnel.
144 */
145
42da2a58 146static void t_destroy(tunnel *t)
6047fbac 147 { sel_rmfile(&t->f); close(t->f.fd); DESTROY(t); }
410c8acf 148
42da2a58 149const tunnel_ops tun_unet = {
150 "unet",
388e0319 151 TUNF_PRIVOPEN,
42da2a58 152 t_init,
153 t_create,
72917fe7 154 0,
42da2a58 155 t_inject,
156 t_destroy
157};
158
159#endif
160
410c8acf 161/*----- That's all, folks -------------------------------------------------*/