chiark / gitweb /
server/tripe.h: Allow `break' from FOREACH_PEER.
[tripe] / server / tun-bsd.c
CommitLineData
fd528bde 1/* -*-c-*-
2 *
fd528bde 3 * Tunnel interface for 4.4BSD-derived systems
4 *
5 * (c) 2001 Straylight/Edgeware
6 */
7
e04c2d50 8/*----- Licensing notice --------------------------------------------------*
fd528bde 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 *
fd528bde 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 *
fd528bde 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
fd528bde 27/*----- Header files ------------------------------------------------------*/
28
42da2a58 29#define TUN_INTERNALS
30
fd528bde 31#include "tripe.h"
32
33/*----- Main code ---------------------------------------------------------*/
34
42da2a58 35#ifdef TUN_BSD
36
37struct tunnel {
38 const tunnel_ops *ops; /* Pointer to operations */
39 sel_file f; /* Selector for tunnel device */
40 struct peer *p; /* Pointer to my peer */
e04c2d50 41};
42da2a58 42
fd528bde 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
42da2a58 54static void t_read(int fd, unsigned mode, void *v)
fd528bde 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) {
b476642f
MW
62 a_warn("TUN", "%s", p_ifname(t->p), "bsd",
63 "read-error", "?ERRNO", A_END);
fd528bde 64 return;
65 }
66 IF_TRACING(T_TUNNEL, {
060ca767 67 trace(T_TUNNEL, "tun-bsd: packet arrived");
68 trace_block(T_PACKET, "tun-bsd: packet contents", buf_i, n);
fd528bde 69 })
70 buf_init(&b, buf_i, n);
71 p_tun(t->p, &b);
72}
73
42da2a58 74/* --- @t_init@ --- *
fd528bde 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; }
fd528bde 85
eb5f3fea
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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 */
fd528bde 96
eb5f3fea
MW
97static tunnel *t_create(peer *p, int fd, char **ifn)
98{
99 tunnel *t;
100
101 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
42da2a58 102 t = CREATE(tunnel);
103 t->ops = &tun_bsd;
fd528bde 104 t->p = p;
fd528bde 105 sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
106 sel_addfile(&t->f);
42da2a58 107 return (t);
fd528bde 108}
109
42da2a58 110/* --- @t_inject@ --- *
fd528bde 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)
fd528bde 121{
122 IF_TRACING(T_TUNNEL, {
060ca767 123 trace(T_TUNNEL, "tun-bsd: inject decrypted packet");
124 trace_block(T_PACKET, "tun-bsd: packet contents", BBASE(b), BLEN(b));
fd528bde 125 })
23df0e5b 126 IGNORE(write(t->f.fd, BBASE(b), BLEN(b)));
fd528bde 127}
128
42da2a58 129/* --- @t_destroy@ --- *
fd528bde 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); }
fd528bde 140
42da2a58 141const tunnel_ops tun_bsd = {
142 "bsd",
388e0319 143 TUNF_PRIVOPEN,
42da2a58 144 t_init,
145 t_create,
72917fe7 146 0,
42da2a58 147 t_inject,
148 t_destroy
149};
150
151#endif
152
fd528bde 153/*----- That's all, folks -------------------------------------------------*/