3 * $Id: tun-unet.c,v 1.5 2002/01/13 14:57:05 mdw Exp $
5 * Tunnel interface based on Linux Usernet
7 * (c) 2001 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Trivial IP Encryption (TrIPE).
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.
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.
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.
29 /*----- Revision history --------------------------------------------------*
31 * $Log: tun-unet.c,v $
32 * Revision 1.5 2002/01/13 14:57:05 mdw
33 * Make @t_read@ be static, as it always should have been.
35 * Revision 1.4 2001/02/19 19:10:45 mdw
36 * Set unet devices to be point-to-point.
38 * Revision 1.3 2001/02/05 19:55:00 mdw
39 * Guard against inappropriate compilation.
41 * Revision 1.2 2001/02/04 17:10:58 mdw
42 * Make file descriptors be nonblocking and close-on-exec.
44 * Revision 1.1 2001/02/03 20:26:37 mdw
49 /*----- Header files ------------------------------------------------------*/
53 #include <sys/ioctl.h>
57 /*----- Main code ---------------------------------------------------------*/
59 #if TUN_TYPE != TUN_UNET
60 # error "Tunnel type mismatch: fix the Makefile"
65 * Arguments: @int fd@ = file descriptor to read
66 * @unsigned mode@ = what's happened
67 * @void *v@ = pointer to tunnel block
71 * Use: Reads data from the tunnel.
74 static void t_read(int fd
, unsigned mode
, void *v
)
80 n
= read(fd
, buf_i
, sizeof(buf_i
));
82 a_warn("tunnel read failed (%s): %s", tun_ifname(t
), strerror(errno
));
85 IF_TRACING(T_TUNNEL
, {
86 trace(T_TUNNEL
, "tunnel: packet arrived");
87 trace_block(T_PACKET
, "tunnel: packet contents", buf_i
, n
);
89 buf_init(&b
, buf_i
, n
);
93 /* --- @tun_init@ --- *
99 * Use: Initializes the tunneling system. Maybe this will require
100 * opening file descriptors or something.
108 /* --- @tun_create@ --- *
110 * Arguments: @tunnel *t@ = pointer to tunnel block
111 * @peer *p@ = pointer to peer block
113 * Returns: Zero if it worked, nonzero on failure.
115 * Use: Initializes a new tunnel.
118 int tun_create(tunnel
*t
, peer
*p
)
123 if ((fd
= open("/dev/unet", O_RDWR
)) < 0) {
124 a_warn("open `/dev/unet' failed: %s", strerror(errno
));
127 fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, FD_CLOEXEC
, FD_CLOEXEC
);
128 if ((f
= ioctl(fd
, UNIOCGIFFLAGS
)) < 0 ||
129 ioctl(fd
, UNIOCSIFFLAGS
, f
| IFF_POINTOPOINT
)) {
130 a_warn("couldn't set point-to-point flag: %s", strerror(errno
));
135 sel_initfile(&sel
, &t
->f
, fd
, SEL_READ
, t_read
, t
);
137 T( trace(T_TUNNEL
, "tunnel: attached interface %s to peer `%s'",
138 tun_ifname(t
), p_name(p
)); )
142 /* --- @tun_ifname@ --- *
144 * Arguments: @tunnel *t@ = pointer to tunnel block
146 * Returns: A pointer to the tunnel's interface name.
149 const char *tun_ifname(tunnel
*t
)
151 static char b
[UNET_NAMEMAX
];
152 struct unet_info uni
;
153 if (ioctl(t
->f
.fd
, UNIOCGINFO
, &uni
)) {
154 a_warn("ioctl(UNIOCGINFO) failed: %s", strerror(errno
));
157 if (strlen(uni
.uni_ifname
) + 1 > sizeof(b
)) {
158 a_warn("interface name too long!");
161 strcpy(b
, uni
.uni_ifname
);
165 /* --- @tun_inject@ --- *
167 * Arguments: @tunnel *t@ = pointer to tunnel block
168 * @buf *b@ = buffer to send
172 * Use: Injects a packet into the local network stack.
175 void tun_inject(tunnel
*t
, buf
*b
)
177 IF_TRACING(T_TUNNEL
, {
178 trace(T_TUNNEL
, "tunnel: inject decrypted packet");
179 trace_block(T_PACKET
, "tunnel: packet contents", BBASE(b
), BLEN(b
));
181 write(t
->f
.fd
, BBASE(b
), BLEN(b
));
184 /* --- @tun_destroy@ --- *
186 * Arguments: @tunnel *t@ = pointer to tunnel block
190 * Use: Destroys a tunnel.
193 void tun_destroy(tunnel
*t
)
199 /*----- That's all, folks -------------------------------------------------*/