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