5 * Various handy server-only utilities
7 * (c) 2001 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Trivial IP Encryption (TrIPE).
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.
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.
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.
29 /*----- Header files ------------------------------------------------------*/
33 /*----- Global variables --------------------------------------------------*/
35 octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ];
37 /*----- Main code ---------------------------------------------------------*/
41 * Arguments: @mp *m@ = a multiprecision integer
43 * Returns: A pointer to the integer's textual representation.
45 * Use: Converts a multiprecision integer to a string. Corrupts
49 const char *mpstr(mp *m)
51 if (mp_writestring(m, (char *)buf_t, sizeof(buf_t), 10))
53 return ((const char *)buf_t);
58 * Arguments: @group *g@ = a group
59 * @ge *x@ = a group element
61 * Returns: A pointer to the element's textual representation.
63 * Use: Converts a group element to a string. Corrupts
67 const char *gestr(group *g, ge *x)
69 if (group_writestring(g, x, (char *)buf_t, sizeof(buf_t)))
71 return ((const char *)buf_t);
74 /* --- @timestr@ --- *
76 * Arguments: @time_t t@ = a time to convert
78 * Returns: A pointer to a textual representation of the time.
80 * Use: Converts a time to a textual representation. Corrupts
84 const char *timestr(time_t t)
90 strftime((char *)buf_t, sizeof(buf_t), "%Y-%m-%dT%H:%M:%S", tm);
91 return ((const char *)buf_t);
94 /* --- @seq_reset@ --- *
96 * Arguments: @seqwin *s@ = sequence-checking window
100 * Use: Resets a sequence number window.
103 void seq_reset(seqwin *s) { s->seq = 0; s->win = 0; }
105 /* --- @seq_check@ --- *
107 * Arguments: @seqwin *s@ = sequence-checking window
108 * @uint32 q@ = sequence number to check
109 * @const char *service@ = service to report message from
111 * Returns: Zero on success, nonzero if the sequence number was bad.
113 * Use: Checks a sequence number against the window, updating things
117 int seq_check(seqwin *s, uint32 q, const char *service)
123 a_warn(service, "replay", "old-sequence", A_END);
126 if (q >= s->seq + SEQ_WINSZ) {
127 n = q - (s->seq + SEQ_WINSZ - 1);
134 qbit = 1 << (q - s->seq);
136 a_warn(service, "replay", "duplicated-sequence", A_END);
143 /*----- That's all, folks -------------------------------------------------*/