88ce83d08d1b216be7b2905eaaccba252bb1a867
3 * Tunnel interface based on Linux Usernet
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 ------------------------------------------------------*/
34 # include <sys/ioctl.h>
39 /*----- Main code ---------------------------------------------------------*/
44 const tunnel_ops
*ops
; /* Pointer to operations */
45 sel_file f
; /* Selector for Usernet device */
46 struct peer
*p
; /* Pointer to my peer */
51 * Arguments: @int fd@ = file descriptor to read
52 * @unsigned mode@ = what's happened
53 * @void *v@ = pointer to tunnel block
57 * Use: Reads data from the tunnel.
60 static void t_read(int fd
, unsigned mode
, void *v
)
66 n
= read(fd
, buf_i
, sizeof(buf_i
));
68 a_warn("TUN", "%s", p_ifname(t
->p
), "read-error", "?ERRNO", A_END
);
71 IF_TRACING(T_TUNNEL
, {
72 trace(T_TUNNEL
, "tun-unet: packet arrived");
73 trace_block(T_PACKET
, "tun-unet: packet contents", buf_i
, n
);
75 buf_init(&b
, buf_i
, n
);
85 * Use: Initializes the tunneling system. Maybe this will require
86 * opening file descriptors or something.
89 static void t_init(void) { return; }
93 * Arguments: @char **ifn@ = where to put the interface name
95 * Returns: A file descriptor, or @-1@ on failure.
97 * Use: Opens a tunnel device. This will run with root privileges
98 * even if the rest of the server has dropped them.
101 static int t_open(char **ifn
)
105 struct unet_info uni
;
107 if ((fd
= open("/dev/unet", O_RDWR
)) < 0) {
108 a_warn("TUN", "-", "unet", "open-error", "/dev/unet", "?ERRNO", A_END
);
111 if ((f
= ioctl(fd
, UNIOCGIFFLAGS
)) < 0 ||
112 ioctl(fd
, UNIOCSIFFLAGS
, f
| IFF_POINTOPOINT
)) {
113 a_warn("TUN", "-", "unet", "config-error", "?ERRNO", A_END
);
116 if (ioctl(t
->f
.fd
, UNIOCGINFO
, &uni
)) {
117 a_warn("TUN", "-", "unet", "getinfo-error", "?ERRNO", A_END
);
120 *ifn
= xstrdup(uni
.uni_ifname
);
129 /* --- @t_create@ --- *
131 * Arguments: @peer *p@ = pointer to peer block
132 * @int fd@ = file descriptor of tunnel device
133 * @char **ifn@ = where to put the interface name
135 * Returns: A tunnel block if it worked, or null on failure.
137 * Use: Initializes a new tunnel.
140 static tunnel
*t_create(peer
*p
, int fd
, char **ifn
)
144 fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, FD_CLOEXEC
, FD_CLOEXEC
);
148 sel_initfile(&sel
, &t
->f
, fd
, SEL_READ
, t_read
, t
);
153 /* --- @t_inject@ --- *
155 * Arguments: @tunnel *t@ = pointer to tunnel block
156 * @buf *b@ = buffer to send
160 * Use: Injects a packet into the local network stack.
163 static void t_inject(tunnel
*t
, buf
*b
)
165 IF_TRACING(T_TUNNEL
, {
166 trace(T_TUNNEL
, "tun-unet: inject decrypted packet");
167 trace_block(T_PACKET
, "tun-unet: packet contents", BBASE(b
), BLEN(b
));
169 write(t
->f
.fd
, BBASE(b
), BLEN(b
));
172 /* --- @t_destroy@ --- *
174 * Arguments: @tunnel *t@ = pointer to tunnel block
178 * Use: Destroys a tunnel.
181 static void t_destroy(tunnel
*t
)
182 { sel_rmfile(&t
->f
); close(t
->f
.fd
); DESTROY(t
); }
184 const tunnel_ops tun_unet
= {
196 /*----- That's all, folks -------------------------------------------------*/