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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 <sys/utsname.h> |
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29 | |
30 | #include "automech.h" |
31 | |
32 | struct buffer { |
33 | unsigned char *base; |
34 | unsigned char *start; |
35 | size_t size; |
36 | }; |
37 | |
38 | struct mechdata; |
39 | |
40 | typedef void mes_functype(struct mechdata **md_r, int *maxprefix_io, int *maxsuffix_io); |
41 | typedef void mds_functype(struct mechdata **md_r); |
42 | |
43 | typedef void menc_functype(struct mechdata *md, struct buffer*); |
44 | typedef const char *mdec_functype(struct mechdata *md, struct buffer*); |
45 | |
46 | struct mechanism { |
47 | const char *name; |
48 | mes_functype *encsetup; |
49 | mds_functype *decsetup; |
50 | menc_functype *encode; |
51 | mdec_functype *decode; |
52 | }; |
53 | |
54 | extern const struct mechanism *const mechanismlists[]; |
55 | |
56 | /* setup function may call getarg_xxx functions and then |
57 | * reads/writes key material to/from fd |
58 | * |
59 | * setup_in function may increase maxprefix and maxsuffix |
60 | * code functions modify buffer in place |
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61 | * decode function returns 0 meaning packet decoded ok, |
62 | * "" meaning discard it quietly, or message to print for verbose discard |
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63 | */ |
64 | |
65 | const char *getarg_string(void); |
66 | unsigned long getarg_ulong(void); |
67 | |
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68 | #define PROGRAM "udptunnel-forwarder" |
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69 | extern char programid[]; |
70 | |
71 | void *buf_append(struct buffer *buf, size_t amount); |
72 | void *buf_prepend(struct buffer *buf, size_t amount); |
73 | void *buf_unappend(struct buffer *buf, size_t amount); /* may give 0 */ |
74 | void *buf_unprepend(struct buffer *buf, size_t amount); /* may give 0 */ |
75 | |
76 | void sysfail(const char *msg); |
77 | void fail(const char *msg); |
78 | void sysdiag(const char *msg); |
79 | void diag(const char *msg); |
80 | |
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81 | extern const char *const *argv; |
82 | |
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83 | time_t now(void); |
84 | void *xmalloc(size_t sz); |
85 | void get_random(void *ptr, size_t sz); |
86 | void random_key(void *ptr, size_t sz); |
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87 | void write_must(int fd, const void *p_in, int sz, const char *what); |
88 | void read_must(int fd, void *p_in, int sz, const char *what); |
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89 | |
90 | void arg_assert_fail(const char *msg); |
91 | #define arg_assert(v) (v ? (void)0 : arg_assert_fail(#v)) |
92 | |
93 | #define XMALLOC(variable) ((variable)= xmalloc(sizeof(*(variable)))) |
94 | |
95 | #define BUF_UNSOMEEND(var,buf,sz,whichend) \ |
96 | do { var= whichend(buf,sz); if (!var) return "message truncated"; } while(0) |
97 | #define BUF_UNAPPEND(var,buf,sz) BUF_UNSOMEEND(var,buf,sz,buf_unappend) |
98 | #define BUF_UNPREPEND(var,buf,sz) BUF_UNSOMEEND(var,buf,sz,buf_unprepend) |
99 | |
100 | #define STANDARD_MECHANISMLIST(mechstring,filename) \ |
101 | const struct mechanism mechlist_##filename []= { \ |
102 | STANDARD_MECHANISM(mechstring,filename) \ |
103 | { 0 } \ |
104 | }; |
105 | |
106 | #define STANDARD_MECHANISM(mechstring,mechname) \ |
107 | { mechstring, mes_##mechname, mds_##mechname, menc_##mechname, mdec_##mechname }, |
108 | |
109 | #endif |