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410c8acf | 1 | /* -*-c-*- |
2 | * | |
37941236 | 3 | * $Id$ |
410c8acf | 4 | * |
5 | * Various handy server-only utilities | |
6 | * | |
7 | * (c) 2001 Straylight/Edgeware | |
8 | */ | |
9 | ||
10 | /*----- Licensing notice --------------------------------------------------* | |
11 | * | |
12 | * This file is part of Trivial IP Encryption (TrIPE). | |
13 | * | |
14 | * TrIPE is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
18 | * | |
19 | * TrIPE is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public License | |
25 | * along with TrIPE; if not, write to the Free Software Foundation, | |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
27 | */ | |
28 | ||
410c8acf | 29 | /*----- Header files ------------------------------------------------------*/ |
30 | ||
31 | #include "tripe.h" | |
32 | ||
df9dfccf | 33 | /*----- Global variables --------------------------------------------------*/ |
34 | ||
35 | octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ]; | |
36 | ||
410c8acf | 37 | /*----- Main code ---------------------------------------------------------*/ |
38 | ||
39 | /* --- @mpstr@ --- * | |
40 | * | |
41 | * Arguments: @mp *m@ = a multiprecision integer | |
42 | * | |
43 | * Returns: A pointer to the integer's textual representation. | |
44 | * | |
45 | * Use: Converts a multiprecision integer to a string. Corrupts | |
a7880467 | 46 | * @buf_t@. |
410c8acf | 47 | */ |
48 | ||
49 | const char *mpstr(mp *m) | |
50 | { | |
a7880467 | 51 | if (mp_writestring(m, (char *)buf_t, sizeof(buf_t), 10)) |
410c8acf | 52 | return ("<failed>"); |
a7880467 | 53 | return ((const char *)buf_t); |
54 | } | |
55 | ||
52c03a2a | 56 | /* --- @gestr@ --- * |
57 | * | |
58 | * Arguments: @group *g@ = a group | |
59 | * @ge *x@ = a group element | |
60 | * | |
61 | * Returns: A pointer to the element's textual representation. | |
62 | * | |
63 | * Use: Converts a group element to a string. Corrupts | |
64 | * @buf_t@. | |
65 | */ | |
66 | ||
67 | const char *gestr(group *g, ge *x) | |
68 | { | |
69 | if (group_writestring(g, x, (char *)buf_t, sizeof(buf_t))) | |
70 | return ("<failed>"); | |
71 | return ((const char *)buf_t); | |
72 | } | |
73 | ||
a7880467 | 74 | /* --- @timestr@ --- * |
75 | * | |
76 | * Arguments: @time_t t@ = a time to convert | |
77 | * | |
78 | * Returns: A pointer to a textual representation of the time. | |
79 | * | |
80 | * Use: Converts a time to a textual representation. Corrupts | |
81 | * @buf_t@. | |
82 | */ | |
83 | ||
84 | const char *timestr(time_t t) | |
85 | { | |
86 | struct tm *tm; | |
87 | if (!t) | |
88 | return ("NEVER"); | |
89 | tm = localtime(&t); | |
90 | strftime((char *)buf_t, sizeof(buf_t), "%Y-%m-%dT%H:%M:%S", tm); | |
91 | return ((const char *)buf_t); | |
410c8acf | 92 | } |
93 | ||
37941236 | 94 | /* --- @seq_reset@ --- * |
95 | * | |
96 | * Arguments: @seqwin *s@ = sequence-checking window | |
97 | * | |
98 | * Returns: --- | |
99 | * | |
100 | * Use: Resets a sequence number window. | |
101 | */ | |
102 | ||
103 | void seq_reset(seqwin *s) { s->seq = 0; s->win = 0; } | |
104 | ||
105 | /* --- @seq_check@ --- * | |
106 | * | |
107 | * Arguments: @seqwin *s@ = sequence-checking window | |
108 | * @uint32 q@ = sequence number to check | |
f43df819 | 109 | * @const char *service@ = service to report message from |
37941236 | 110 | * |
f43df819 | 111 | * Returns: Zero on success, nonzero if the sequence number was bad. |
37941236 | 112 | * |
113 | * Use: Checks a sequence number against the window, updating things | |
114 | * as necessary. | |
115 | */ | |
116 | ||
f43df819 | 117 | int seq_check(seqwin *s, uint32 q, const char *service) |
37941236 | 118 | { |
119 | uint32 qbit; | |
120 | uint32 n; | |
121 | ||
f43df819 MW |
122 | if (q < s->seq) { |
123 | a_warn(service, "replay", "old-sequence", A_END); | |
124 | return (-1); | |
125 | } | |
37941236 | 126 | if (q >= s->seq + SEQ_WINSZ) { |
127 | n = q - (s->seq + SEQ_WINSZ - 1); | |
128 | if (n < SEQ_WINSZ) | |
129 | s->win >>= n; | |
130 | else | |
131 | s->win = 0; | |
132 | s->seq += n; | |
133 | } | |
134 | qbit = 1 << (q - s->seq); | |
f43df819 MW |
135 | if (s->win & qbit) { |
136 | a_warn(service, "replay", "duplicated-sequence", A_END); | |
137 | return (-1); | |
138 | } | |
37941236 | 139 | s->win |= qbit; |
140 | return (0); | |
141 | } | |
142 | ||
410c8acf | 143 | /*----- That's all, folks -------------------------------------------------*/ |