chiark / gitweb /
mon/tripemon.in: Add per-peer key selection and mobile options.
[tripe] / server / tun-std.c
CommitLineData
37075862 1/* -*-c-*-
2 *
cd1f3310 3 * Tunnel interface for Linux-tun-shaped arrangements
37075862 4 *
5 * (c) 2003 Straylight/Edgeware
6 */
7
e04c2d50 8/*----- Licensing notice --------------------------------------------------*
37075862 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 *
37075862 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 *
37075862 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
37075862 27/*----- Header files ------------------------------------------------------*/
28
42da2a58 29#define TUN_INTERNALS
30
37075862 31#include "tripe.h"
32
37075862 33/*----- Main code ---------------------------------------------------------*/
34
cd1f3310 35#if defined(TUN_LINUX) || defined(TUN_BSD) || defined(TUN_UNET)
42da2a58 36
37struct tunnel {
38 const tunnel_ops *ops; /* Pointer to operations */
39 sel_file f; /* Selector for TUN/TAP device */
40 struct peer *p; /* Pointer to my peer */
e04c2d50 41};
37075862 42
43/* --- @t_read@ --- *
44 *
45 * Arguments: @int fd@ = file descriptor to read
46 * @unsigned mode@ = what's happened
47 * @void *v@ = pointer to tunnel block
48 *
49 * Returns: ---
50 *
51 * Use: Reads data from the tunnel.
52 */
53
54static void t_read(int fd, unsigned mode, void *v)
55{
56 tunnel *t = v;
57 ssize_t n;
58 buf b;
59
60 n = read(fd, buf_i, sizeof(buf_i));
61 if (n < 0) {
cd1f3310 62 a_warn("TUN", "%s", p_ifname(t->p), "%s", t->ops->name,
b476642f 63 "read-error", "?ERRNO", A_END);
37075862 64 return;
65 }
66 IF_TRACING(T_TUNNEL, {
cd1f3310
MW
67 trace(T_TUNNEL, "tun-%s: packet arrived", t->ops->name);
68 trace_block(T_PACKET, "tunnel: packet contents", buf_i, n);
37075862 69 })
70 buf_init(&b, buf_i, n);
71 p_tun(t->p, &b);
72}
73
42da2a58 74/* --- @t_init@ --- *
37075862 75 *
76 * Arguments: ---
77 *
78 * Returns: ---
79 *
80 * Use: Initializes the tunneling system. Maybe this will require
81 * opening file descriptors or something.
82 */
83
42da2a58 84static void t_init(void) { return; }
37075862 85
eb5f3fea
MW
86/* --- @t_create@ --- *
87 *
88 * Arguments: @peer *p@ = pointer to peer block
89 * @int fd@ = file descriptor of tunnel device
90 * @char **ifn@ = where to put the interface name
91 *
92 * Returns: A tunnel block if it worked, or null on failure.
93 *
94 * Use: Initializes a new tunnel.
95 */
96
cd1f3310 97static tunnel *t_create(peer *p, int fd, char **ifn, const tunnel_ops *ops)
eb5f3fea
MW
98{
99 tunnel *t;
100
101 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
42da2a58 102 t = CREATE(tunnel);
cd1f3310 103 t->ops = ops;
37075862 104 t->p = p;
105 sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
106 sel_addfile(&t->f);
42da2a58 107 return (t);
37075862 108}
109
42da2a58 110/* --- @t_inject@ --- *
37075862 111 *
112 * Arguments: @tunnel *t@ = pointer to tunnel block
113 * @buf *b@ = buffer to send
114 *
115 * Returns: ---
116 *
117 * Use: Injects a packet into the local network stack.
118 */
119
42da2a58 120static void t_inject(tunnel *t, buf *b)
37075862 121{
122 IF_TRACING(T_TUNNEL, {
cd1f3310 123 trace(T_TUNNEL, "tun-%s: inject decrypted packet", t->ops->name);
37075862 124 trace_block(T_PACKET, "tunnel: packet contents", BBASE(b), BLEN(b));
125 })
99735357 126 DISCARD(write(t->f.fd, BBASE(b), BLEN(b)));
37075862 127}
128
42da2a58 129/* --- @t_destroy@ --- *
37075862 130 *
131 * Arguments: @tunnel *t@ = pointer to tunnel block
132 *
133 * Returns: ---
134 *
135 * Use: Destroys a tunnel.
136 */
137
42da2a58 138static void t_destroy(tunnel *t)
6047fbac 139 { sel_rmfile(&t->f); close(t->f.fd); DESTROY(t); }
37075862 140
cd1f3310
MW
141#define DEFOPS(name) \
142 \
143static tunnel *t_create_##name(peer *p, int fd, char **ifn); \
144 \
145const tunnel_ops tun_##name = { \
146 #name, TUNF_PRIVOPEN, \
147 t_init, t_create_##name, 0, t_inject, t_destroy \
148}; \
149 \
150static tunnel *t_create_##name(peer *p, int fd, char **ifn) \
151 { return t_create(p, fd, ifn, &tun_##name); }
152
153#ifdef TUN_LINUX
154 DEFOPS(linux)
155#endif
156
157#ifdef TUN_BSD
158 DEFOPS(bsd)
159#endif
160
161#ifdef TUN_UNET
162 DEFOPS(unet)
163#endif
42da2a58 164
165#endif
166
37075862 167/*----- That's all, folks -------------------------------------------------*/