1 | /* |
---|
2 | * magic.c - PPP Magic Number routines. |
---|
3 | * |
---|
4 | * Copyright (c) 1989 Carnegie Mellon University. |
---|
5 | * All rights reserved. |
---|
6 | * |
---|
7 | * Redistribution and use in source and binary forms are permitted |
---|
8 | * provided that the above copyright notice and this paragraph are |
---|
9 | * duplicated in all such forms and that any documentation, |
---|
10 | * advertising materials, and other materials related to such |
---|
11 | * distribution and use acknowledge that the software was developed |
---|
12 | * by Carnegie Mellon University. The name of the |
---|
13 | * University may not be used to endorse or promote products derived |
---|
14 | * from this software without specific prior written permission. |
---|
15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
---|
16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
---|
17 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
---|
18 | */ |
---|
19 | |
---|
20 | #ifndef lint |
---|
21 | /* static char rcsid[] = "$Id$"; */ |
---|
22 | #endif |
---|
23 | |
---|
24 | #include <stdio.h> |
---|
25 | #include <unistd.h> |
---|
26 | #include <stdlib.h> |
---|
27 | #include <sys/types.h> |
---|
28 | #include <sys/time.h> |
---|
29 | |
---|
30 | #include "pppd.h" |
---|
31 | #include "magic.h" |
---|
32 | |
---|
33 | extern long mrand48 __P((void)); |
---|
34 | extern void srand48 __P((long)); |
---|
35 | |
---|
36 | /* |
---|
37 | * magic_init - Initialize the magic number generator. |
---|
38 | * |
---|
39 | * Attempts to compute a random number seed which will not repeat. |
---|
40 | * The current method uses the current hostid, current process ID |
---|
41 | * and current time, currently. |
---|
42 | */ |
---|
43 | void |
---|
44 | magic_init() |
---|
45 | { |
---|
46 | long seed; |
---|
47 | struct timeval t; |
---|
48 | |
---|
49 | gettimeofday(&t, NULL); |
---|
50 | seed = get_host_seed() ^ t.tv_sec ^ t.tv_usec ^ getpid(); |
---|
51 | srand48(seed); |
---|
52 | } |
---|
53 | |
---|
54 | /* |
---|
55 | * magic - Returns the next magic number. |
---|
56 | */ |
---|
57 | u_int32_t |
---|
58 | magic() |
---|
59 | { |
---|
60 | return (u_int32_t) mrand48(); |
---|
61 | } |
---|
62 | |
---|
63 | /* |
---|
64 | * Substitute procedures for those systems which don't have |
---|
65 | * drand48 et al. |
---|
66 | */ |
---|
67 | /* #include <stdlib.h> */ |
---|
68 | double |
---|
69 | drand48() |
---|
70 | { |
---|
71 | return (double)rand() / (double)0x7fffffffL; /* 2**31-1 */ |
---|
72 | } |
---|
73 | |
---|
74 | long |
---|
75 | mrand48() |
---|
76 | { |
---|
77 | return rand(); |
---|
78 | } |
---|
79 | |
---|
80 | void |
---|
81 | srand48(seedval) |
---|
82 | long seedval; |
---|
83 | { |
---|
84 | srand((int)seedval); |
---|
85 | } |
---|
86 | |
---|