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 /*----- Header files ------------------------------------------------------*/
36 # include <sys/ioctl.h>
41 /*----- Main code ---------------------------------------------------------*/
46 const tunnel_ops *ops; /* Pointer to operations */
47 sel_file f; /* Selector for Usernet device */
48 struct peer *p; /* Pointer to my peer */
51 /* --- @t_ifname@ --- *
53 * Arguments: @tunnel *t@ = pointer to tunnel block
55 * Returns: A pointer to the tunnel's interface name.
58 static const char *t_ifname(tunnel *t)
60 static char b[UNET_NAMEMAX];
62 if (ioctl(t->f.fd, UNIOCGINFO, &uni)) {
63 a_warn("TUN - unet getinfo-error -- %s", strerror(errno));
66 if (strlen(uni.uni_ifname) + 1 > sizeof(b)) {
67 a_warn("TUN - unet ifname-too-long");
70 strcpy(b, uni.uni_ifname);
76 * Arguments: @int fd@ = file descriptor to read
77 * @unsigned mode@ = what's happened
78 * @void *v@ = pointer to tunnel block
82 * Use: Reads data from the tunnel.
85 static void t_read(int fd, unsigned mode, void *v)
91 n = read(fd, buf_i, sizeof(buf_i));
93 a_warn("TUN %s read-error -- %s", t_ifname(t), strerror(errno));
96 IF_TRACING(T_TUNNEL, {
97 trace(T_TUNNEL, "tunnel: packet arrived");
98 trace_block(T_PACKET, "tunnel: packet contents", buf_i, n);
100 buf_init(&b, buf_i, n);
104 /* --- @t_init@ --- *
110 * Use: Initializes the tunneling system. Maybe this will require
111 * opening file descriptors or something.
114 static void t_init(void) { return; }
116 /* --- @t_create@ --- *
118 * Arguments: @tunnel *t@ = pointer to tunnel block
119 * @peer *p@ = pointer to peer block
121 * Returns: A tunnel block if it worked, or null on failure.
123 * Use: Initializes a new tunnel.
126 static tunnel *t_create(peer *p)
132 if ((fd = open("/dev/unet", O_RDWR)) < 0) {
133 a_warn("TUN - open-error /dev/unet -- %s", strerror(errno));
136 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
137 if ((f = ioctl(fd, UNIOCGIFFLAGS)) < 0 ||
138 ioctl(fd, UNIOCSIFFLAGS, f | IFF_POINTOPOINT)) {
139 a_warn("TUN - unet config-error -- %s", strerror(errno));
146 sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
148 T( trace(T_TUNNEL, "tunnel: attached interface %s to peer `%s'",
149 t_ifname(t), p_name(p)); )
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, "tunnel: inject decrypted packet");
167 trace_block(T_PACKET, "tunnel: 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)
188 const tunnel_ops tun_unet = {
199 /*----- That's all, folks -------------------------------------------------*/