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410c8acf | 1 | /* -*-c-*- |
410c8acf | 2 | * |
3 | * Various handy server-only utilities | |
4 | * | |
5 | * (c) 2001 Straylight/Edgeware | |
6 | */ | |
7 | ||
e04c2d50 | 8 | /*----- Licensing notice --------------------------------------------------* |
410c8acf | 9 | * |
10 | * This file is part of Trivial IP Encryption (TrIPE). | |
11 | * | |
11ad66c2 MW |
12 | * TrIPE is free software: you can redistribute it and/or modify it under |
13 | * the terms of the GNU General Public License as published by the Free | |
14 | * Software Foundation; either version 3 of the License, or (at your | |
15 | * option) any later version. | |
e04c2d50 | 16 | * |
11ad66c2 MW |
17 | * TrIPE is distributed in the hope that it will be useful, but WITHOUT |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
20 | * for more details. | |
e04c2d50 | 21 | * |
410c8acf | 22 | * You should have received a copy of the GNU General Public License |
11ad66c2 | 23 | * along with TrIPE. If not, see <https://www.gnu.org/licenses/>. |
410c8acf | 24 | */ |
25 | ||
410c8acf | 26 | /*----- Header files ------------------------------------------------------*/ |
27 | ||
28 | #include "tripe.h" | |
29 | ||
df9dfccf | 30 | /*----- Global variables --------------------------------------------------*/ |
31 | ||
a4b808b0 | 32 | octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ], buf_u[PKBUFSZ]; |
df9dfccf | 33 | |
410c8acf | 34 | /*----- Main code ---------------------------------------------------------*/ |
35 | ||
a7880467 | 36 | /* --- @timestr@ --- * |
37 | * | |
38 | * Arguments: @time_t t@ = a time to convert | |
39 | * | |
40 | * Returns: A pointer to a textual representation of the time. | |
41 | * | |
42 | * Use: Converts a time to a textual representation. Corrupts | |
a4b808b0 | 43 | * @buf_u@. |
a7880467 | 44 | */ |
45 | ||
46 | const char *timestr(time_t t) | |
47 | { | |
48 | struct tm *tm; | |
49 | if (!t) | |
50 | return ("NEVER"); | |
51 | tm = localtime(&t); | |
a4b808b0 MW |
52 | strftime((char *)buf_u, sizeof(buf_u), "%Y-%m-%dT%H:%M:%S", tm); |
53 | return ((const char *)buf_u); | |
410c8acf | 54 | } |
55 | ||
52b86648 MW |
56 | /* --- @mystrieq@ --- * |
57 | * | |
58 | * Arguments: @const char *x, *y@ = two strings | |
59 | * | |
60 | * Returns: True if @x@ and @y are equal, up to case. | |
61 | */ | |
62 | ||
63 | int mystrieq(const char *x, const char *y) | |
64 | { | |
65 | for (;;) { | |
66 | if (!*x && !*y) return (1); | |
67 | if (tolower((unsigned char)*x) != tolower((unsigned char)*y)) | |
68 | return (0); | |
69 | x++; y++; | |
70 | } | |
71 | } | |
72 | ||
37941236 | 73 | /* --- @seq_reset@ --- * |
74 | * | |
75 | * Arguments: @seqwin *s@ = sequence-checking window | |
76 | * | |
77 | * Returns: --- | |
78 | * | |
79 | * Use: Resets a sequence number window. | |
80 | */ | |
81 | ||
82 | void seq_reset(seqwin *s) { s->seq = 0; s->win = 0; } | |
83 | ||
84 | /* --- @seq_check@ --- * | |
85 | * | |
86 | * Arguments: @seqwin *s@ = sequence-checking window | |
87 | * @uint32 q@ = sequence number to check | |
f43df819 | 88 | * @const char *service@ = service to report message from |
37941236 | 89 | * |
f43df819 | 90 | * Returns: Zero on success, nonzero if the sequence number was bad. |
37941236 | 91 | * |
92 | * Use: Checks a sequence number against the window, updating things | |
93 | * as necessary. | |
94 | */ | |
95 | ||
f43df819 | 96 | int seq_check(seqwin *s, uint32 q, const char *service) |
37941236 | 97 | { |
98 | uint32 qbit; | |
99 | uint32 n; | |
100 | ||
f43df819 MW |
101 | if (q < s->seq) { |
102 | a_warn(service, "replay", "old-sequence", A_END); | |
103 | return (-1); | |
104 | } | |
37941236 | 105 | if (q >= s->seq + SEQ_WINSZ) { |
106 | n = q - (s->seq + SEQ_WINSZ - 1); | |
107 | if (n < SEQ_WINSZ) | |
108 | s->win >>= n; | |
109 | else | |
110 | s->win = 0; | |
111 | s->seq += n; | |
112 | } | |
113 | qbit = 1 << (q - s->seq); | |
f43df819 MW |
114 | if (s->win & qbit) { |
115 | a_warn(service, "replay", "duplicated-sequence", A_END); | |
116 | return (-1); | |
117 | } | |
37941236 | 118 | s->win |= qbit; |
119 | return (0); | |
120 | } | |
121 | ||
410c8acf | 122 | /*----- That's all, folks -------------------------------------------------*/ |