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1 | /* |
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2 | * Encrypting tunnel for userv-ipif tunnels, header file |
3 | */ |
4 | /* |
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5 | * Copyright (C) 2000,2003 Ian Jackson |
6 | * This file is part of ipif, part of userv-utils |
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7 | * |
8 | * This is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU General Public License as published by |
10 | * the Free Software Foundation; either version 2 of the License, or |
11 | * (at your option) any later version. |
12 | * |
13 | * This program is distributed in the hope that it will be useful, but |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | * General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU General Public License |
19 | * along with userv-utils; if not, write to the Free Software |
20 | * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 | */ |
22 | |
23 | #ifndef MECHS_H |
24 | #define MECHS_H |
25 | |
26 | #include <stdio.h> |
27 | #include <time.h> |
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28 | #include <string.h> |
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29 | #include <sys/utsname.h> |
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30 | |
31 | #include "automech.h" |
32 | |
33 | struct buffer { |
34 | unsigned char *base; |
35 | unsigned char *start; |
36 | size_t size; |
37 | }; |
38 | |
39 | struct mechdata; |
40 | |
41 | typedef void mes_functype(struct mechdata **md_r, int *maxprefix_io, int *maxsuffix_io); |
42 | typedef void mds_functype(struct mechdata **md_r); |
43 | |
44 | typedef void menc_functype(struct mechdata *md, struct buffer*); |
45 | typedef const char *mdec_functype(struct mechdata *md, struct buffer*); |
46 | |
47 | struct mechanism { |
48 | const char *name; |
49 | mes_functype *encsetup; |
50 | mds_functype *decsetup; |
51 | menc_functype *encode; |
52 | mdec_functype *decode; |
53 | }; |
54 | |
55 | extern const struct mechanism *const mechanismlists[]; |
56 | |
57 | /* setup function may call getarg_xxx functions and then |
58 | * reads/writes key material to/from fd |
59 | * |
60 | * setup_in function may increase maxprefix and maxsuffix |
61 | * code functions modify buffer in place |
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62 | * decode function returns 0 meaning packet decoded ok, |
63 | * "" meaning discard it quietly, or message to print for verbose discard |
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64 | */ |
65 | |
66 | const char *getarg_string(void); |
67 | unsigned long getarg_ulong(void); |
68 | |
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69 | #define PROGRAM "udptunnel-forwarder" |
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70 | extern char programid[]; |
71 | |
72 | void *buf_append(struct buffer *buf, size_t amount); |
73 | void *buf_prepend(struct buffer *buf, size_t amount); |
74 | void *buf_unappend(struct buffer *buf, size_t amount); /* may give 0 */ |
75 | void *buf_unprepend(struct buffer *buf, size_t amount); /* may give 0 */ |
76 | |
77 | void sysfail(const char *msg); |
78 | void fail(const char *msg); |
79 | void sysdiag(const char *msg); |
80 | void diag(const char *msg); |
81 | |
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82 | extern const char *const *argv; |
83 | |
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84 | time_t now(void); |
85 | void *xmalloc(size_t sz); |
86 | void get_random(void *ptr, size_t sz); |
87 | void random_key(void *ptr, size_t sz); |
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88 | void write_must(int fd, const void *p_in, int sz, const char *what); |
89 | void read_must(int fd, void *p_in, int sz, const char *what); |
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90 | |
91 | void arg_assert_fail(const char *msg); |
92 | #define arg_assert(v) (v ? (void)0 : arg_assert_fail(#v)) |
93 | |
94 | #define XMALLOC(variable) ((variable)= xmalloc(sizeof(*(variable)))) |
95 | |
96 | #define BUF_UNSOMEEND(var,buf,sz,whichend) \ |
97 | do { var= whichend(buf,sz); if (!var) return "message truncated"; } while(0) |
98 | #define BUF_UNAPPEND(var,buf,sz) BUF_UNSOMEEND(var,buf,sz,buf_unappend) |
99 | #define BUF_UNPREPEND(var,buf,sz) BUF_UNSOMEEND(var,buf,sz,buf_unprepend) |
100 | |
101 | #define STANDARD_MECHANISMLIST(mechstring,filename) \ |
102 | const struct mechanism mechlist_##filename []= { \ |
103 | STANDARD_MECHANISM(mechstring,filename) \ |
104 | { 0 } \ |
105 | }; |
106 | |
107 | #define STANDARD_MECHANISM(mechstring,mechname) \ |
108 | { mechstring, mes_##mechname, mds_##mechname, menc_##mechname, mdec_##mechname }, |
109 | |
110 | #endif |