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410c8acf | 1 | /* -*-c-*- |
2 | * | |
410c8acf | 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 | |
82ba25cf | 34 | /*----- Sequence numbers --------------------------------------------------*/ |
52b86648 | 35 | |
37941236 | 36 | /* --- @seq_reset@ --- * |
37 | * | |
38 | * Arguments: @seqwin *s@ = sequence-checking window | |
39 | * | |
40 | * Returns: --- | |
41 | * | |
42 | * Use: Resets a sequence number window. | |
43 | */ | |
44 | ||
45 | void seq_reset(seqwin *s) { s->seq = 0; s->win = 0; } | |
46 | ||
47 | /* --- @seq_check@ --- * | |
48 | * | |
49 | * Arguments: @seqwin *s@ = sequence-checking window | |
50 | * @uint32 q@ = sequence number to check | |
f43df819 | 51 | * @const char *service@ = service to report message from |
37941236 | 52 | * |
f43df819 | 53 | * Returns: Zero on success, nonzero if the sequence number was bad. |
37941236 | 54 | * |
55 | * Use: Checks a sequence number against the window, updating things | |
56 | * as necessary. | |
57 | */ | |
58 | ||
f43df819 | 59 | int seq_check(seqwin *s, uint32 q, const char *service) |
37941236 | 60 | { |
61 | uint32 qbit; | |
62 | uint32 n; | |
63 | ||
f43df819 MW |
64 | if (q < s->seq) { |
65 | a_warn(service, "replay", "old-sequence", A_END); | |
66 | return (-1); | |
67 | } | |
37941236 | 68 | if (q >= s->seq + SEQ_WINSZ) { |
69 | n = q - (s->seq + SEQ_WINSZ - 1); | |
70 | if (n < SEQ_WINSZ) | |
71 | s->win >>= n; | |
72 | else | |
73 | s->win = 0; | |
74 | s->seq += n; | |
75 | } | |
76 | qbit = 1 << (q - s->seq); | |
f43df819 MW |
77 | if (s->win & qbit) { |
78 | a_warn(service, "replay", "duplicated-sequence", A_END); | |
79 | return (-1); | |
80 | } | |
37941236 | 81 | s->win |= qbit; |
82 | return (0); | |
83 | } | |
84 | ||
82ba25cf MW |
85 | /*----- Random odds and sods ----------------------------------------------*/ |
86 | ||
87 | /* --- @timestr@ --- * | |
88 | * | |
89 | * Arguments: @time_t t@ = a time to convert | |
90 | * | |
91 | * Returns: A pointer to a textual representation of the time. | |
92 | * | |
93 | * Use: Converts a time to a textual representation. Corrupts | |
94 | * @buf_u@. | |
95 | */ | |
96 | ||
97 | const char *timestr(time_t t) | |
98 | { | |
99 | struct tm *tm; | |
100 | if (!t) | |
101 | return ("NEVER"); | |
102 | tm = localtime(&t); | |
103 | strftime((char *)buf_u, sizeof(buf_u), "%Y-%m-%dT%H:%M:%S", tm); | |
104 | return ((const char *)buf_u); | |
105 | } | |
106 | ||
107 | /* --- @mystrieq@ --- * | |
108 | * | |
109 | * Arguments: @const char *x, *y@ = two strings | |
110 | * | |
111 | * Returns: True if @x@ and @y are equal, up to case. | |
112 | */ | |
113 | ||
114 | int mystrieq(const char *x, const char *y) | |
115 | { | |
116 | for (;;) { | |
117 | if (!*x && !*y) return (1); | |
118 | if (tolower((unsigned char)*x) != tolower((unsigned char)*y)) | |
119 | return (0); | |
120 | x++; y++; | |
121 | } | |
122 | } | |
123 | ||
410c8acf | 124 | /*----- That's all, folks -------------------------------------------------*/ |