49b5e0e2b2c806457e52639b5a782ff6a73941e7
3 * Tunnel interface for 4.4BSD-derived systems
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Trivial IP Encryption (TrIPE).
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.
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.
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.
27 /*----- Header files ------------------------------------------------------*/
33 /*----- Main code ---------------------------------------------------------*/
38 const tunnel_ops
*ops
; /* Pointer to operations */
39 sel_file f
; /* Selector for tunnel device */
40 struct peer
*p
; /* Pointer to my peer */
41 unsigned n
; /* Number of my tunnel device */
46 * Arguments: @int fd@ = file descriptor to read
47 * @unsigned mode@ = what's happened
48 * @void *v@ = pointer to tunnel block
52 * Use: Reads data from the tunnel.
55 static void t_read(int fd
, unsigned mode
, void *v
)
61 n
= read(fd
, buf_i
, sizeof(buf_i
));
63 a_warn("TUN", "%s", p_ifname(t
->p
), "read-error", "?ERRNO", A_END
);
66 IF_TRACING(T_TUNNEL
, {
67 trace(T_TUNNEL
, "tun-bsd: packet arrived");
68 trace_block(T_PACKET
, "tun-bsd: packet contents", buf_i
, n
);
70 buf_init(&b
, buf_i
, n
);
80 * Use: Initializes the tunneling system. Maybe this will require
81 * opening file descriptors or something.
84 static void t_init(void) { return; }
86 /* --- @t_create@ --- *
88 * Arguments: @peer *p@ = pointer to peer block
89 * @char **ifn@ = where to put the interface name
91 * Returns: A tunnel block if it worked, or null on failure.
93 * Use: Initializes a new tunnel.
96 static tunnel
*t_create(peer
*p
, char **ifn
)
105 sprintf(buf
, "/dev/tun%u", n
);
106 if ((fd
= open(buf
, O_RDWR
)) >= 0)
110 T( trace(T_TUNNEL
, "tunnel device %u busy: skipping", n
); )
113 a_warn("TUN", "-", "bsd", "no-tunnel-devices", A_END
);
116 a_warn("TUN", "-", "open-error", "%s", buf
, "?ERRNO", A_END
);
124 fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, FD_CLOEXEC
, FD_CLOEXEC
);
127 sel_initfile(&sel
, &t
->f
, fd
, SEL_READ
, t_read
, t
);
129 *ifn
= xstrdup(buf
+ 5);
130 T( trace(T_TUNNEL
, "tun-bsd: attached interface %s to peer `%s'",
135 /* --- @t_inject@ --- *
137 * Arguments: @tunnel *t@ = pointer to tunnel block
138 * @buf *b@ = buffer to send
142 * Use: Injects a packet into the local network stack.
145 static void t_inject(tunnel
*t
, buf
*b
)
147 IF_TRACING(T_TUNNEL
, {
148 trace(T_TUNNEL
, "tun-bsd: inject decrypted packet");
149 trace_block(T_PACKET
, "tun-bsd: packet contents", BBASE(b
), BLEN(b
));
151 write(t
->f
.fd
, BBASE(b
), BLEN(b
));
154 /* --- @t_destroy@ --- *
156 * Arguments: @tunnel *t@ = pointer to tunnel block
160 * Use: Destroys a tunnel.
163 static void t_destroy(tunnel
*t
)
164 { sel_rmfile(&t
->f
); close(t
->f
.fd
); DESTROY(t
); }
166 const tunnel_ops tun_bsd
= {
177 /*----- That's all, folks -------------------------------------------------*/