Commit | Line | Data |
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410c8acf | 1 | /* -*-c-*- |
410c8acf | 2 | * |
3 | * Tunnel interface based on Linux Usernet | |
4 | * | |
5 | * (c) 2001 Straylight/Edgeware | |
6 | */ | |
7 | ||
e04c2d50 | 8 | /*----- Licensing notice --------------------------------------------------* |
410c8acf | 9 | * |
10 | * This file is part of Trivial IP Encryption (TrIPE). | |
11 | * | |
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. | |
e04c2d50 | 16 | * |
410c8acf | 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. | |
e04c2d50 | 21 | * |
410c8acf | 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. | |
25 | */ | |
26 | ||
410c8acf | 27 | /*----- Header files ------------------------------------------------------*/ |
28 | ||
42da2a58 | 29 | #define TUN_INTERNALS |
30 | ||
410c8acf | 31 | #include "tripe.h" |
32 | ||
42da2a58 | 33 | #ifdef TUN_UNET |
34 | # include <sys/ioctl.h> | |
35 | # include <net/if.h> | |
36 | # include <unet.h> | |
37 | #endif | |
410c8acf | 38 | |
39 | /*----- Main code ---------------------------------------------------------*/ | |
40 | ||
42da2a58 | 41 | #ifdef TUN_UNET |
42 | ||
43 | struct tunnel { | |
44 | const tunnel_ops *ops; /* Pointer to operations */ | |
45 | sel_file f; /* Selector for Usernet device */ | |
46 | struct peer *p; /* Pointer to my peer */ | |
47 | }; | |
48 | ||
410c8acf | 49 | /* --- @t_read@ --- * |
50 | * | |
51 | * Arguments: @int fd@ = file descriptor to read | |
52 | * @unsigned mode@ = what's happened | |
53 | * @void *v@ = pointer to tunnel block | |
54 | * | |
55 | * Returns: --- | |
56 | * | |
57 | * Use: Reads data from the tunnel. | |
58 | */ | |
59 | ||
60a837d8 | 60 | static void t_read(int fd, unsigned mode, void *v) |
410c8acf | 61 | { |
62 | tunnel *t = v; | |
63 | ssize_t n; | |
64 | buf b; | |
65 | ||
66 | n = read(fd, buf_i, sizeof(buf_i)); | |
67 | if (n < 0) { | |
72917fe7 | 68 | a_warn("TUN", "%s", p_ifname(t->p), "read-error", "?ERRNO", A_END); |
410c8acf | 69 | return; |
70 | } | |
71 | IF_TRACING(T_TUNNEL, { | |
060ca767 | 72 | trace(T_TUNNEL, "tun-unet: packet arrived"); |
73 | trace_block(T_PACKET, "tun-unet: packet contents", buf_i, n); | |
410c8acf | 74 | }) |
75 | buf_init(&b, buf_i, n); | |
76 | p_tun(t->p, &b); | |
77 | } | |
78 | ||
42da2a58 | 79 | /* --- @t_init@ --- * |
410c8acf | 80 | * |
81 | * Arguments: --- | |
82 | * | |
83 | * Returns: --- | |
84 | * | |
85 | * Use: Initializes the tunneling system. Maybe this will require | |
86 | * opening file descriptors or something. | |
87 | */ | |
88 | ||
42da2a58 | 89 | static void t_init(void) { return; } |
410c8acf | 90 | |
eb5f3fea | 91 | /* --- @t_open@ --- * |
410c8acf | 92 | * |
eb5f3fea | 93 | * Arguments: @char **ifn@ = where to put the interface name |
410c8acf | 94 | * |
eb5f3fea | 95 | * Returns: A file descriptor, or @-1@ on failure. |
410c8acf | 96 | * |
eb5f3fea MW |
97 | * Use: Opens a tunnel device. This will run with root privileges |
98 | * even if the rest of the server has dropped them. | |
410c8acf | 99 | */ |
100 | ||
eb5f3fea | 101 | static int t_open(char **ifn) |
410c8acf | 102 | { |
103 | int fd; | |
a368bfbc | 104 | int f; |
72917fe7 | 105 | struct unet_info uni; |
410c8acf | 106 | |
107 | if ((fd = open("/dev/unet", O_RDWR)) < 0) { | |
f43df819 | 108 | a_warn("TUN", "-", "unet", "open-error", "/dev/unet", "?ERRNO", A_END); |
eb5f3fea | 109 | goto fail_0; |
410c8acf | 110 | } |
a368bfbc | 111 | if ((f = ioctl(fd, UNIOCGIFFLAGS)) < 0 || |
112 | ioctl(fd, UNIOCSIFFLAGS, f | IFF_POINTOPOINT)) { | |
f43df819 | 113 | a_warn("TUN", "-", "unet", "config-error", "?ERRNO", A_END); |
eb5f3fea | 114 | goto fail_1; |
a368bfbc | 115 | } |
eb5f3fea MW |
116 | if (ioctl(t->f.fd, UNIOCGINFO, &uni)) { |
117 | a_warn("TUN", "-", "unet", "getinfo-error", "?ERRNO", A_END); | |
118 | goto fail_1; | |
119 | } | |
120 | *ifn = xstrdup(uni.uni_ifname); | |
121 | return (fd); | |
122 | ||
123 | fail_1: | |
124 | close(fd); | |
125 | fail_0: | |
126 | return (-1); | |
127 | } | |
128 | ||
129 | /* --- @t_create@ --- * | |
130 | * | |
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 | |
134 | * | |
135 | * Returns: A tunnel block if it worked, or null on failure. | |
136 | * | |
137 | * Use: Initializes a new tunnel. | |
138 | */ | |
139 | ||
140 | static tunnel *t_create(peer *p, int fd, char **ifn) | |
141 | { | |
142 | tunnel *t; | |
143 | ||
144 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); | |
42da2a58 | 145 | t = CREATE(tunnel); |
146 | t->ops = &tun_unet; | |
410c8acf | 147 | t->p = p; |
148 | sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t); | |
149 | sel_addfile(&t->f); | |
42da2a58 | 150 | return (t); |
410c8acf | 151 | } |
152 | ||
42da2a58 | 153 | /* --- @t_inject@ --- * |
410c8acf | 154 | * |
155 | * Arguments: @tunnel *t@ = pointer to tunnel block | |
156 | * @buf *b@ = buffer to send | |
157 | * | |
158 | * Returns: --- | |
159 | * | |
160 | * Use: Injects a packet into the local network stack. | |
161 | */ | |
162 | ||
42da2a58 | 163 | static void t_inject(tunnel *t, buf *b) |
410c8acf | 164 | { |
165 | IF_TRACING(T_TUNNEL, { | |
060ca767 | 166 | trace(T_TUNNEL, "tun-unet: inject decrypted packet"); |
167 | trace_block(T_PACKET, "tun-unet: packet contents", BBASE(b), BLEN(b)); | |
410c8acf | 168 | }) |
169 | write(t->f.fd, BBASE(b), BLEN(b)); | |
170 | } | |
171 | ||
42da2a58 | 172 | /* --- @t_destroy@ --- * |
410c8acf | 173 | * |
174 | * Arguments: @tunnel *t@ = pointer to tunnel block | |
175 | * | |
176 | * Returns: --- | |
177 | * | |
178 | * Use: Destroys a tunnel. | |
179 | */ | |
180 | ||
42da2a58 | 181 | static void t_destroy(tunnel *t) |
6047fbac | 182 | { sel_rmfile(&t->f); close(t->f.fd); DESTROY(t); } |
410c8acf | 183 | |
42da2a58 | 184 | const tunnel_ops tun_unet = { |
185 | "unet", | |
186 | t_init, | |
eb5f3fea | 187 | t_open, |
42da2a58 | 188 | t_create, |
72917fe7 | 189 | 0, |
42da2a58 | 190 | t_inject, |
191 | t_destroy | |
192 | }; | |
193 | ||
194 | #endif | |
195 | ||
410c8acf | 196 | /*----- That's all, folks -------------------------------------------------*/ |