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Change key exchange message interface. Maintain statistics.
[tripe] / tun-unet.c
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410c8acf 1/* -*-c-*-
2 *
e78f24a2 3 * $Id: tun-unet.c,v 1.3 2001/02/05 19:55:00 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
29/*----- Revision history --------------------------------------------------*
30 *
31 * $Log: tun-unet.c,v $
e78f24a2 32 * Revision 1.3 2001/02/05 19:55:00 mdw
33 * Guard against inappropriate compilation.
34 *
650a6624 35 * Revision 1.2 2001/02/04 17:10:58 mdw
36 * Make file descriptors be nonblocking and close-on-exec.
37 *
410c8acf 38 * Revision 1.1 2001/02/03 20:26:37 mdw
39 * Initial checkin.
40 *
41 */
42
43/*----- Header files ------------------------------------------------------*/
44
45#include "tripe.h"
46
47#include <sys/ioctl.h>
48#include <unet.h>
49
50/*----- Main code ---------------------------------------------------------*/
51
e78f24a2 52#if TUN_TYPE != TUN_UNET
53# error "Tunnel type mismatch: fix the Makefile"
54#endif
55
410c8acf 56/* --- @t_read@ --- *
57 *
58 * Arguments: @int fd@ = file descriptor to read
59 * @unsigned mode@ = what's happened
60 * @void *v@ = pointer to tunnel block
61 *
62 * Returns: ---
63 *
64 * Use: Reads data from the tunnel.
65 */
66
67void t_read(int fd, unsigned mode, void *v)
68{
69 tunnel *t = v;
70 ssize_t n;
71 buf b;
72
73 n = read(fd, buf_i, sizeof(buf_i));
74 if (n < 0) {
75 a_warn("tunnel read failed (%s): %s", tun_ifname(t), strerror(errno));
76 return;
77 }
78 IF_TRACING(T_TUNNEL, {
79 trace(T_TUNNEL, "tunnel: packet arrived");
80 trace_block(T_PACKET, "tunnel: packet contents", buf_i, n);
81 })
82 buf_init(&b, buf_i, n);
83 p_tun(t->p, &b);
84}
85
86/* --- @tun_init@ --- *
87 *
88 * Arguments: ---
89 *
90 * Returns: ---
91 *
92 * Use: Initializes the tunneling system. Maybe this will require
93 * opening file descriptors or something.
94 */
95
96void tun_init(void)
97{
98 return;
99}
100
101/* --- @tun_create@ --- *
102 *
103 * Arguments: @tunnel *t@ = pointer to tunnel block
104 * @peer *p@ = pointer to peer block
105 *
106 * Returns: Zero if it worked, nonzero on failure.
107 *
108 * Use: Initializes a new tunnel.
109 */
110
111int tun_create(tunnel *t, peer *p)
112{
113 int fd;
114
115 if ((fd = open("/dev/unet", O_RDWR)) < 0) {
116 a_warn("open `/dev/unet' failed: %s", strerror(errno));
117 return (-1);
118 }
650a6624 119 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
410c8acf 120 t->p = p;
121 sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
122 sel_addfile(&t->f);
123 T( trace(T_TUNNEL, "tunnel: attached interface %s to peer `%s'",
124 tun_ifname(t), p_name(p)); )
125 return (0);
126}
127
128/* --- @tun_ifname@ --- *
129 *
130 * Arguments: @tunnel *t@ = pointer to tunnel block
131 *
132 * Returns: A pointer to the tunnel's interface name.
133 */
134
135const char *tun_ifname(tunnel *t)
136{
137 static char b[UNET_NAMEMAX];
138 struct unet_info uni;
139 if (ioctl(t->f.fd, UNIOCGINFO, &uni)) {
140 a_warn("ioctl(UNIOCGINFO) failed: %s", strerror(errno));
141 return ("<error>");
142 }
143 if (strlen(uni.uni_ifname) + 1 > sizeof(b)) {
144 a_warn("interface name too long!");
145 return ("<error>");
146 }
147 strcpy(b, uni.uni_ifname);
148 return (b);
149}
150
151/* --- @tun_inject@ --- *
152 *
153 * Arguments: @tunnel *t@ = pointer to tunnel block
154 * @buf *b@ = buffer to send
155 *
156 * Returns: ---
157 *
158 * Use: Injects a packet into the local network stack.
159 */
160
161void tun_inject(tunnel *t, buf *b)
162{
163 IF_TRACING(T_TUNNEL, {
164 trace(T_TUNNEL, "tunnel: inject decrypted packet");
165 trace_block(T_PACKET, "tunnel: packet contents", BBASE(b), BLEN(b));
166 })
167 write(t->f.fd, BBASE(b), BLEN(b));
168}
169
170/* --- @tun_destroy@ --- *
171 *
172 * Arguments: @tunnel *t@ = pointer to tunnel block
173 *
174 * Returns: ---
175 *
176 * Use: Destroys a tunnel.
177 */
178
179void tun_destroy(tunnel *t)
180{
181 sel_rmfile(&t->f);
182 close(t->f.fd);
183}
184
185/*----- That's all, folks -------------------------------------------------*/