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/* $Id$ */
/* standalone uhash loader -- jochang */
#include "bbs.h"
unsigned string_hash(unsigned char *s);
void userec_add_to_uhash(int n, userec_t *id, int onfly);
void fill_uhash(int onfly);
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, err;
shmid = shmget(SHM_KEY, sizeof(SHM_t), IPC_CREAT | IPC_EXCL | 0600);
err = errno;
if( err == EEXIST)
shmid = shmget(SHM_KEY, sizeof(SHM_t), IPC_CREAT | 0600);
if (shmid < 0)
{
perror("shmget");
exit(1);
}
SHM = (void *) shmat(shmid, NULL, 0);
if (SHM == (void *) -1)
{
perror("shmat");
exit(1);
}
if( err != EEXIST)
SHM->number=SHM->loaded = 0;
// in case it's not assumed zero, this becomes a race...
if(SHM->number==0 && SHM->loaded == 0)
{
SHM->loaded = 0;
fill_uhash(0);
SHM->loaded = 1;
}
else
{
fill_uhash(1);
}
}
void checkhash(int h)
{
int *p = &(SHM->hash_head[h]), ch, deep=0;
while(*p != -1)
{
if(*p <-1 || *p >= MAX_USERS) {*p=-1; return;}
ch = string_hash( SHM->userid[*p]);
if(ch!=h)
{
printf("remove %d %d!=%d %d [%s] next:%d\n",
deep, h, ch, *p, SHM->userid[*p],
SHM->next_in_hash[*p]);
*p = SHM->next_in_hash[*p]; //remove from link
// *p=-1; Ptt: cut it?
//return;
}
else
p = &(SHM->next_in_hash[*p]);
deep++;
}
}
void fill_uhash(int onfly)
{
int fd, usernumber;
usernumber = 0;
for (fd = 0; fd < (1 << HASH_BITS); fd++)
if(!onfly)
SHM->hash_head[fd] = -1;
else
checkhash(fd);
if ((fd = open(FN_PASSWD, O_RDWR)) > 0)
{
struct stat stbuf;
caddr_t fimage, mimage;
fstat(fd, &stbuf);
fimage = mmap(NULL, stbuf.st_size, PROT_WRITE|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))
{
userec_add_to_uhash(usernumber, (userec_t *)mimage, onfly);
usernumber++;
}
munmap(fimage, stbuf.st_size);
}
else
{
perror("open");
exit(1);
}
SHM->number = usernumber;
printf("total %d names %s.\n", usernumber, onfly ? "checked":"loaded");
}
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 * 2654435769U) >> (32 - HASH_BITS);
}
void userec_add_to_uhash(int n, userec_t *user, int onfly)
{
int *p, h, l=0;
h = string_hash(user->userid);
p = &(SHM->hash_head[h]);
if(!onfly || SHM->userid[n][0] != user->userid[0] ||
strncmp(SHM->userid[n], user->userid, IDLEN-1))
{
strcpy(SHM->userid[n], user->userid);
SHM->money[n] = user->money;
if(onfly)
printf("add %s\n", user->userid);
}
while (*p != -1)
{
if(onfly && *p==n ) // already in hash
return;
l++;
p = &(SHM->next_in_hash[*p]);
}
if(onfly)
printf("add %d %d %d [%s] in hash\n", l, h, n, user->userid);
SHM->next_in_hash[*p = n] = -1;
}
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