chiark / gitweb /
Expunge CVS cruft.
[tripe] / tun-unet.c
CommitLineData
410c8acf 1/* -*-c-*-
2 *
b4e56668 3 * $Id: tun-unet.c,v 1.6 2004/04/08 01:36:17 mdw Exp $
410c8acf 4 *
5 * Tunnel interface based on Linux Usernet
6 *
7 * (c) 2001 Straylight/Edgeware
8 */
9
10/*----- Licensing notice --------------------------------------------------*
11 *
12 * This file is part of Trivial IP Encryption (TrIPE).
13 *
14 * TrIPE is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * TrIPE is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with TrIPE; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 */
28
410c8acf 29/*----- Header files ------------------------------------------------------*/
30
31#include "tripe.h"
32
33#include <sys/ioctl.h>
a368bfbc 34#include <net/if.h>
410c8acf 35#include <unet.h>
36
37/*----- Main code ---------------------------------------------------------*/
38
e78f24a2 39#if TUN_TYPE != TUN_UNET
40# error "Tunnel type mismatch: fix the Makefile"
41#endif
42
410c8acf 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
60a837d8 54static void t_read(int fd, unsigned mode, void *v)
410c8acf 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) {
62 a_warn("tunnel read failed (%s): %s", tun_ifname(t), strerror(errno));
63 return;
64 }
65 IF_TRACING(T_TUNNEL, {
66 trace(T_TUNNEL, "tunnel: packet arrived");
67 trace_block(T_PACKET, "tunnel: packet contents", buf_i, n);
68 })
69 buf_init(&b, buf_i, n);
70 p_tun(t->p, &b);
71}
72
73/* --- @tun_init@ --- *
74 *
75 * Arguments: ---
76 *
77 * Returns: ---
78 *
79 * Use: Initializes the tunneling system. Maybe this will require
80 * opening file descriptors or something.
81 */
82
83void tun_init(void)
84{
85 return;
86}
87
88/* --- @tun_create@ --- *
89 *
90 * Arguments: @tunnel *t@ = pointer to tunnel block
91 * @peer *p@ = pointer to peer block
92 *
93 * Returns: Zero if it worked, nonzero on failure.
94 *
95 * Use: Initializes a new tunnel.
96 */
97
98int tun_create(tunnel *t, peer *p)
99{
100 int fd;
a368bfbc 101 int f;
410c8acf 102
103 if ((fd = open("/dev/unet", O_RDWR)) < 0) {
104 a_warn("open `/dev/unet' failed: %s", strerror(errno));
105 return (-1);
106 }
650a6624 107 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
a368bfbc 108 if ((f = ioctl(fd, UNIOCGIFFLAGS)) < 0 ||
109 ioctl(fd, UNIOCSIFFLAGS, f | IFF_POINTOPOINT)) {
110 a_warn("couldn't set point-to-point flag: %s", strerror(errno));
111 close(fd);
112 return (-1);
113 }
410c8acf 114 t->p = p;
115 sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
116 sel_addfile(&t->f);
117 T( trace(T_TUNNEL, "tunnel: attached interface %s to peer `%s'",
118 tun_ifname(t), p_name(p)); )
119 return (0);
120}
121
122/* --- @tun_ifname@ --- *
123 *
124 * Arguments: @tunnel *t@ = pointer to tunnel block
125 *
126 * Returns: A pointer to the tunnel's interface name.
127 */
128
129const char *tun_ifname(tunnel *t)
130{
131 static char b[UNET_NAMEMAX];
132 struct unet_info uni;
133 if (ioctl(t->f.fd, UNIOCGINFO, &uni)) {
134 a_warn("ioctl(UNIOCGINFO) failed: %s", strerror(errno));
135 return ("<error>");
136 }
137 if (strlen(uni.uni_ifname) + 1 > sizeof(b)) {
138 a_warn("interface name too long!");
139 return ("<error>");
140 }
141 strcpy(b, uni.uni_ifname);
142 return (b);
143}
144
145/* --- @tun_inject@ --- *
146 *
147 * Arguments: @tunnel *t@ = pointer to tunnel block
148 * @buf *b@ = buffer to send
149 *
150 * Returns: ---
151 *
152 * Use: Injects a packet into the local network stack.
153 */
154
155void tun_inject(tunnel *t, buf *b)
156{
157 IF_TRACING(T_TUNNEL, {
158 trace(T_TUNNEL, "tunnel: inject decrypted packet");
159 trace_block(T_PACKET, "tunnel: packet contents", BBASE(b), BLEN(b));
160 })
161 write(t->f.fd, BBASE(b), BLEN(b));
162}
163
164/* --- @tun_destroy@ --- *
165 *
166 * Arguments: @tunnel *t@ = pointer to tunnel block
167 *
168 * Returns: ---
169 *
170 * Use: Destroys a tunnel.
171 */
172
173void tun_destroy(tunnel *t)
174{
175 sel_rmfile(&t->f);
176 close(t->f.fd);
177}
178
179/*----- That's all, folks -------------------------------------------------*/