1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/* $Id$ */
/* standalone uhash loader -- jochang */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#ifdef __FreeBSD__
#include <machine/param.h>
#endif
#include "config.h"
#include "pttstruct.h"
#include "common.h"
unsigned string_hash(unsigned char *s);
void add_to_uhash(int n, userec_t *id);
void fill_uhash(void);
void load_uhash(void);
SHM_t *SHM;
int main() {
setgid(BBSGID);
setuid(BBSUID);
chdir(BBSHOME);
load_uhash();
return 0;
}
void load_uhash(void) {
int shmid;
shmid = shmget(SHM_KEY, sizeof(SHM_t), IPC_CREAT | 0600);
/* note we didn't use IPC_EXCL here.
so if the loading fails,
(like .PASSWD doesn't exist)
we may try again later.
*/
if (shmid < 0)
{
perror("shmget");
exit(1);
}
SHM = (void *) shmat(shmid, NULL, 0);
if (SHM == (void *) -1)
{
perror("shmat");
exit(1);
}
/* in case it's not assumed zero, this becomes a race... */
SHM->loaded = 0;
fill_uhash();
/* ok... */
SHM->loaded = 1;
}
void fill_uhash(void)
{
int fd, usernumber;
usernumber = 0;
for (fd = 0; fd < (1 << HASH_BITS); fd++)
SHM->hash_head[fd] = -1;
if ((fd = open(FN_PASSWD, O_RDONLY)) > 0)
{
struct stat stbuf;
caddr_t fimage, mimage;
fstat(fd, &stbuf);
fimage = mmap(NULL, stbuf.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (fimage == (char *) -1)
{
perror("mmap");
exit(1);
}
close(fd);
fd = stbuf.st_size / sizeof(userec_t);
if (fd > MAX_USERS)
fd = MAX_USERS;
for (mimage = fimage; usernumber < fd; mimage += sizeof(userec_t))
{
add_to_uhash(usernumber, (userec_t *)mimage);
usernumber++;
}
munmap(fimage, stbuf.st_size);
}
else
{
perror("open");
exit(1);
}
SHM->number = usernumber;
printf("total %d names loaded.\n", usernumber);
}
unsigned string_hash(unsigned char *s)
{
unsigned int v = 0;
while (*s)
{
v = (v << 8) | (v >> 24);
v ^= toupper(*s++); /* note this is case insensitive */
}
return (v * 2654435769UL) >> (32 - HASH_BITS);
}
void add_to_uhash(int n, userec_t *user)
{
int *p, h = string_hash(user->userid);
strcpy(SHM->userid[n], user->userid);
SHM->money[n] = user->money;
p = &(SHM->hash_head[h]);
while (*p != -1)
p = &(SHM->next_in_hash[*p]);
SHM->next_in_hash[*p = n] = -1;
}
|
