Commit | Line | Data |
---|---|---|
fd528bde | 1 | /* -*-c-*- |
fd528bde | 2 | * |
3 | * Tunnel interface for 4.4BSD-derived systems | |
4 | * | |
5 | * (c) 2001 Straylight/Edgeware | |
6 | */ | |
7 | ||
e04c2d50 | 8 | /*----- Licensing notice --------------------------------------------------* |
fd528bde | 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 | * |
fd528bde | 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 | * |
fd528bde | 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 | ||
fd528bde | 27 | /*----- Header files ------------------------------------------------------*/ |
28 | ||
42da2a58 | 29 | #define TUN_INTERNALS |
30 | ||
fd528bde | 31 | #include "tripe.h" |
32 | ||
33 | /*----- Main code ---------------------------------------------------------*/ | |
34 | ||
42da2a58 | 35 | #ifdef TUN_BSD |
36 | ||
37 | struct tunnel { | |
38 | const tunnel_ops *ops; /* Pointer to operations */ | |
39 | sel_file f; /* Selector for tunnel device */ | |
40 | struct peer *p; /* Pointer to my peer */ | |
e04c2d50 | 41 | }; |
42da2a58 | 42 | |
fd528bde | 43 | /* --- @t_read@ --- * |
44 | * | |
45 | * Arguments: @int fd@ = file descriptor to read | |
46 | * @unsigned mode@ = what's happened | |
47 | * @void *v@ = pointer to tunnel block | |
48 | * | |
49 | * Returns: --- | |
50 | * | |
51 | * Use: Reads data from the tunnel. | |
52 | */ | |
53 | ||
42da2a58 | 54 | static void t_read(int fd, unsigned mode, void *v) |
fd528bde | 55 | { |
56 | tunnel *t = v; | |
57 | ssize_t n; | |
58 | buf b; | |
59 | ||
60 | n = read(fd, buf_i, sizeof(buf_i)); | |
61 | if (n < 0) { | |
72917fe7 | 62 | a_warn("TUN", "%s", p_ifname(t->p), "read-error", "?ERRNO", A_END); |
fd528bde | 63 | return; |
64 | } | |
65 | IF_TRACING(T_TUNNEL, { | |
060ca767 | 66 | trace(T_TUNNEL, "tun-bsd: packet arrived"); |
67 | trace_block(T_PACKET, "tun-bsd: packet contents", buf_i, n); | |
fd528bde | 68 | }) |
69 | buf_init(&b, buf_i, n); | |
70 | p_tun(t->p, &b); | |
71 | } | |
72 | ||
42da2a58 | 73 | /* --- @t_init@ --- * |
fd528bde | 74 | * |
75 | * Arguments: --- | |
76 | * | |
77 | * Returns: --- | |
78 | * | |
79 | * Use: Initializes the tunneling system. Maybe this will require | |
80 | * opening file descriptors or something. | |
81 | */ | |
82 | ||
42da2a58 | 83 | static void t_init(void) { return; } |
fd528bde | 84 | |
eb5f3fea MW |
85 | /* --- @t_create@ --- * |
86 | * | |
87 | * Arguments: @peer *p@ = pointer to peer block | |
88 | * @int fd@ = file descriptor of tunnel device | |
89 | * @char **ifn@ = where to put the interface name | |
90 | * | |
91 | * Returns: A tunnel block if it worked, or null on failure. | |
92 | * | |
93 | * Use: Initializes a new tunnel. | |
94 | */ | |
fd528bde | 95 | |
eb5f3fea MW |
96 | static tunnel *t_create(peer *p, int fd, char **ifn) |
97 | { | |
98 | tunnel *t; | |
99 | ||
100 | fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC); | |
42da2a58 | 101 | t = CREATE(tunnel); |
102 | t->ops = &tun_bsd; | |
fd528bde | 103 | t->p = p; |
fd528bde | 104 | sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t); |
105 | sel_addfile(&t->f); | |
42da2a58 | 106 | return (t); |
fd528bde | 107 | } |
108 | ||
42da2a58 | 109 | /* --- @t_inject@ --- * |
fd528bde | 110 | * |
111 | * Arguments: @tunnel *t@ = pointer to tunnel block | |
112 | * @buf *b@ = buffer to send | |
113 | * | |
114 | * Returns: --- | |
115 | * | |
116 | * Use: Injects a packet into the local network stack. | |
117 | */ | |
118 | ||
42da2a58 | 119 | static void t_inject(tunnel *t, buf *b) |
fd528bde | 120 | { |
121 | IF_TRACING(T_TUNNEL, { | |
060ca767 | 122 | trace(T_TUNNEL, "tun-bsd: inject decrypted packet"); |
123 | trace_block(T_PACKET, "tun-bsd: packet contents", BBASE(b), BLEN(b)); | |
fd528bde | 124 | }) |
125 | write(t->f.fd, BBASE(b), BLEN(b)); | |
126 | } | |
127 | ||
42da2a58 | 128 | /* --- @t_destroy@ --- * |
fd528bde | 129 | * |
130 | * Arguments: @tunnel *t@ = pointer to tunnel block | |
131 | * | |
132 | * Returns: --- | |
133 | * | |
134 | * Use: Destroys a tunnel. | |
135 | */ | |
136 | ||
42da2a58 | 137 | static void t_destroy(tunnel *t) |
6047fbac | 138 | { sel_rmfile(&t->f); close(t->f.fd); DESTROY(t); } |
fd528bde | 139 | |
42da2a58 | 140 | const tunnel_ops tun_bsd = { |
141 | "bsd", | |
388e0319 | 142 | TUNF_PRIVOPEN, |
42da2a58 | 143 | t_init, |
144 | t_create, | |
72917fe7 | 145 | 0, |
42da2a58 | 146 | t_inject, |
147 | t_destroy | |
148 | }; | |
149 | ||
150 | #endif | |
151 | ||
fd528bde | 152 | /*----- That's all, folks -------------------------------------------------*/ |