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 -------------------------------------------------*/