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410c8acf | 1 | /* -*-c-*- |
2 | * | |
3cdc3f3a | 3 | * $Id$ |
410c8acf | 4 | * |
5 | * Tunnel interface based on Linux Usernet | |
6 | * | |
7 | * (c) 2001 Straylight/Edgeware | |
8 | */ | |
9 | ||
e04c2d50 | 10 | /*----- Licensing notice --------------------------------------------------* |
410c8acf | 11 | * |
12 | * This file is part of Trivial IP Encryption (TrIPE). | |
13 | * | |
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. | |
e04c2d50 | 18 | * |
410c8acf | 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. | |
e04c2d50 | 23 | * |
410c8acf | 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. | |
27 | */ | |
28 | ||
410c8acf | 29 | /*----- Header files ------------------------------------------------------*/ |
30 | ||
42da2a58 | 31 | #define TUN_INTERNALS |
32 | ||
410c8acf | 33 | #include "tripe.h" |
34 | ||
42da2a58 | 35 | #ifdef TUN_UNET |
36 | # include <sys/ioctl.h> | |
37 | # include <net/if.h> | |
38 | # include <unet.h> | |
39 | #endif | |
410c8acf | 40 | |
41 | /*----- Main code ---------------------------------------------------------*/ | |
42 | ||
42da2a58 | 43 | #ifdef TUN_UNET |
44 | ||
45 | struct tunnel { | |
46 | const tunnel_ops *ops; /* Pointer to operations */ | |
47 | sel_file f; /* Selector for Usernet device */ | |
48 | struct peer *p; /* Pointer to my peer */ | |
49 | }; | |
50 | ||
410c8acf | 51 | /* --- @t_read@ --- * |
52 | * | |
53 | * Arguments: @int fd@ = file descriptor to read | |
54 | * @unsigned mode@ = what's happened | |
55 | * @void *v@ = pointer to tunnel block | |
56 | * | |
57 | * Returns: --- | |
58 | * | |
59 | * Use: Reads data from the tunnel. | |
60 | */ | |
61 | ||
60a837d8 | 62 | static void t_read(int fd, unsigned mode, void *v) |
410c8acf | 63 | { |
64 | tunnel *t = v; | |
65 | ssize_t n; | |
66 | buf b; | |
67 | ||
68 | n = read(fd, buf_i, sizeof(buf_i)); | |
69 | if (n < 0) { | |
72917fe7 | 70 | a_warn("TUN", "%s", p_ifname(t->p), "read-error", "?ERRNO", A_END); |
410c8acf | 71 | return; |
72 | } | |
73 | IF_TRACING(T_TUNNEL, { | |
060ca767 | 74 | trace(T_TUNNEL, "tun-unet: packet arrived"); |
75 | trace_block(T_PACKET, "tun-unet: packet contents", buf_i, n); | |
410c8acf | 76 | }) |
77 | buf_init(&b, buf_i, n); | |
78 | p_tun(t->p, &b); | |
79 | } | |
80 | ||
42da2a58 | 81 | /* --- @t_init@ --- * |
410c8acf | 82 | * |
83 | * Arguments: --- | |
84 | * | |
85 | * Returns: --- | |
86 | * | |
87 | * Use: Initializes the tunneling system. Maybe this will require | |
88 | * opening file descriptors or something. | |
89 | */ | |
90 | ||
42da2a58 | 91 | static void t_init(void) { return; } |
410c8acf | 92 | |
42da2a58 | 93 | /* --- @t_create@ --- * |
410c8acf | 94 | * |
95 | * Arguments: @tunnel *t@ = pointer to tunnel block | |
96 | * @peer *p@ = pointer to peer block | |
72917fe7 | 97 | * @char *ifn@ = where to put the interface name |
410c8acf | 98 | * |
42da2a58 | 99 | * Returns: A tunnel block if it worked, or null on failure. |
410c8acf | 100 | * |
101 | * Use: Initializes a new tunnel. | |
102 | */ | |
103 | ||
72917fe7 | 104 | static tunnel *t_create(peer *p, char **ifn) |
410c8acf | 105 | { |
106 | int fd; | |
42da2a58 | 107 | tunnel *t; |
a368bfbc | 108 | int f; |
72917fe7 | 109 | struct unet_info uni; |
410c8acf | 110 | |
111 | if ((fd = open("/dev/unet", O_RDWR)) < 0) { | |
f43df819 | 112 | a_warn("TUN", "-", "unet", "open-error", "/dev/unet", "?ERRNO", A_END); |
42da2a58 | 113 | return (0); |
410c8acf | 114 | } |
650a6624 | 115 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); |
a368bfbc | 116 | if ((f = ioctl(fd, UNIOCGIFFLAGS)) < 0 || |
117 | ioctl(fd, UNIOCSIFFLAGS, f | IFF_POINTOPOINT)) { | |
f43df819 | 118 | a_warn("TUN", "-", "unet", "config-error", "?ERRNO", A_END); |
a368bfbc | 119 | close(fd); |
42da2a58 | 120 | return (0); |
a368bfbc | 121 | } |
42da2a58 | 122 | t = CREATE(tunnel); |
123 | t->ops = &tun_unet; | |
410c8acf | 124 | t->p = p; |
125 | sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t); | |
126 | sel_addfile(&t->f); | |
72917fe7 MW |
127 | |
128 | if (ioctl(t->f.fd, UNIOCGINFO, &uni)) { | |
129 | a_warn("TUN", "-", "unet", "getinfo-error", "?ERRNO", A_END); | |
130 | return ("<error>"); | |
131 | } | |
132 | *ifn = xstrdup(uni.uni_ifname); | |
060ca767 | 133 | T( trace(T_TUNNEL, "tun-unet: attached interface %s to peer `%s'", |
72917fe7 | 134 | *ifn, p_name(p)); ) |
42da2a58 | 135 | return (t); |
410c8acf | 136 | } |
137 | ||
42da2a58 | 138 | /* --- @t_inject@ --- * |
410c8acf | 139 | * |
140 | * Arguments: @tunnel *t@ = pointer to tunnel block | |
141 | * @buf *b@ = buffer to send | |
142 | * | |
143 | * Returns: --- | |
144 | * | |
145 | * Use: Injects a packet into the local network stack. | |
146 | */ | |
147 | ||
42da2a58 | 148 | static void t_inject(tunnel *t, buf *b) |
410c8acf | 149 | { |
150 | IF_TRACING(T_TUNNEL, { | |
060ca767 | 151 | trace(T_TUNNEL, "tun-unet: inject decrypted packet"); |
152 | trace_block(T_PACKET, "tun-unet: packet contents", BBASE(b), BLEN(b)); | |
410c8acf | 153 | }) |
154 | write(t->f.fd, BBASE(b), BLEN(b)); | |
155 | } | |
156 | ||
42da2a58 | 157 | /* --- @t_destroy@ --- * |
410c8acf | 158 | * |
159 | * Arguments: @tunnel *t@ = pointer to tunnel block | |
160 | * | |
161 | * Returns: --- | |
162 | * | |
163 | * Use: Destroys a tunnel. | |
164 | */ | |
165 | ||
42da2a58 | 166 | static void t_destroy(tunnel *t) |
410c8acf | 167 | { |
168 | sel_rmfile(&t->f); | |
169 | close(t->f.fd); | |
42da2a58 | 170 | DESTROY(t); |
410c8acf | 171 | } |
172 | ||
42da2a58 | 173 | const tunnel_ops tun_unet = { |
174 | "unet", | |
175 | t_init, | |
176 | t_create, | |
72917fe7 | 177 | 0, |
42da2a58 | 178 | t_inject, |
179 | t_destroy | |
180 | }; | |
181 | ||
182 | #endif | |
183 | ||
410c8acf | 184 | /*----- That's all, folks -------------------------------------------------*/ |