1/* newseed.c: The opienewseed() library function.
2
3%%% copyright-cmetz-96
4This software is Copyright 1996-2001 by Craig Metz, All Rights Reserved.
5The Inner Net License Version 3 applies to this software.
6You should have received a copy of the license with this software. If
7you didn't get a copy, you may request one from <license@inner.net>.
8
9	History:
10
11	Modified by cmetz for OPIE 2.4. Greatly simplified increment. Now does
12		not add digits. Reformatted the code.
13	Modified by cmetz for OPIE 2.32. Added syslog.h if DEBUG.
14	Modified by cmetz for OPIE 2.31. Added time.h.
15	Created by cmetz for OPIE 2.22.
16
17$FreeBSD$
18*/
19
20#include "opie_cfg.h"
21#ifndef HAVE_TIME_H
22#define HAVE_TIME_H 1
23#endif
24#if HAVE_TIME_H
25#include <time.h>
26#endif /* HAVE_TIME_H */
27#if HAVE_STRING_H
28#include <string.h>
29#endif /* HAVE_STRING_H */
30#include <ctype.h>
31#if HAVE_UNISTD_H
32#include <unistd.h>
33#endif /* HAVE_UNISTD_H */
34#if HAVE_SYS_UTSNAME_H
35#include <sys/utsname.h>
36#endif /* HAVE_SYS_UTSNAME_H */
37#include <errno.h>
38#if DEBUG
39#include <syslog.h>
40#endif /* DEBUG */
41#include <stdio.h>
42#include <stdlib.h>
43#include "opie.h"
44
45int opienewseed FUNCTION((seed), char *seed)
46{
47	if (!seed)
48		return -1;
49
50	if (seed[0]) {
51		char *c;
52		unsigned int i, max;
53
54		if ((i = strlen(seed)) > OPIE_SEED_MAX)
55			i = OPIE_SEED_MAX;
56
57		for (c = seed + i - 1, max = 1;
58				(c >= seed) && isdigit(*c); c--)
59			max *= 10;
60
61		if ((i = strtoul(++c, (char **)0, 10)) < max) {
62			if (++i >= max)
63				i = 1;
64
65			sprintf(c, "%d", i);
66			return 0;
67		}
68	}
69
70	{
71		time_t now;
72
73		time(&now);
74		srand(now);
75	}
76
77	{
78		struct utsname utsname;
79
80		if (uname(&utsname) < 0) {
81#if DEBUG
82			syslog(LOG_DEBUG, "uname: %s(%d)", strerror(errno),
83				errno);
84#endif /* DEBUG */
85			utsname.nodename[0] = 'k';
86			utsname.nodename[1] = 'e';
87		}
88		utsname.nodename[2] = 0;
89
90		if (snprintf(seed, OPIE_SEED_MAX+1, "%s%04d", utsname.nodename,
91				(rand() % 9999) + 1) >= OPIE_SEED_MAX+1)
92			return -1;
93		return 0;
94	}
95}
96
97