path: root/util/util_passwd.c

/* $Id: util_passwd.c,v 1.3 2002/11/02 11:02:44 in2 Exp $ */
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include "config.h"
#include "pttstruct.h"
#include "modes.h"
#include "common.h"
#include "proto.h"

#ifndef SEM_R
#define SEM_R 0400
#endif

#ifndef SEM_A
#define SEM_A 0200
#endif

#ifndef __FreeBSD__
union semun {
        int     val;            /* value for SETVAL */
        struct  semid_ds *buf;  /* buffer for IPC_STAT & IPC_SET */
        u_short *array;         /* array for GETALL & SETALL */
        struct seminfo *__buf;  /* buffer for IPC_INFO */
};
#endif

static userec_t *passwd_image = NULL;
static int passwd_image_size;
static int semid = -1;

int passwd_mmap(void) {
    int fd;
    
    if(passwd_image!=NULL) return 0;
    fd = open(FN_PASSWD, O_RDWR);
    if(fd > 0) {
    struct stat st;
    
    fstat(fd, &st);
    passwd_image_size = st.st_size;
    passwd_image = mmap(NULL, passwd_image_size,
                PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    if(passwd_image == (userec_t *)-1) {
        perror("mmap");
        return -1;
    }
        close(fd);  
    semid = semget(PASSWDSEM_KEY, 1, SEM_R | SEM_A | IPC_CREAT | IPC_EXCL);
    if(semid == -1) {
        if(errno == EEXIST) {
        semid = semget(PASSWDSEM_KEY, 1, SEM_R | SEM_A);
        if(semid == -1) {
            perror("semget");
            exit(1);
        }
        } else {
        perror("semget");
        exit(1);
        }
    } else {
        union semun s;
        
        s.val = 1;
        if(semctl(semid, 0, SETVAL, s) == -1) {
        perror("semctl");
        exit(1);
        }
    }
    } else {
    perror(FN_PASSWD);
    return -1;
    }
    return 0;
}
int passwd_update_money(int num) {
    int money;
    if(num < 1 || num > MAX_USERS)
        return -1;
    money = moneyof(num);
    memcpy(&passwd_image[num - 1].money, &money, sizeof(int));
    return 0;
}

int passwd_update(int num, userec_t *buf) {
    if(num < 1 || num > MAX_USERS)
        return -1;
    buf->money = moneyof(num);
    memcpy(&passwd_image[num - 1], buf, sizeof(userec_t));
    return 0;
}

int passwd_query(int num, userec_t *buf) {
    if(num < 1 || num > MAX_USERS)
    return -1;
    memcpy(buf, &passwd_image[num - 1], sizeof(userec_t));
    return 0;
}

int passwd_apply(int (*fptr)(userec_t *)) {
    int i;

    for(i = 0; i < MAX_USERS; i++)
    if((*fptr)(&passwd_image[i]) == QUIT)
        return QUIT;
    return 0;
}

int passwd_apply2(int (*fptr)(int, userec_t *)) {
    int i;

    for(i = 0; i < MAX_USERS; i++)
    if((*fptr)(i, &passwd_image[i]) == QUIT)
        return QUIT;
    return 0;
}

void passwd_lock() {
    struct sembuf buf = { 0, -1, SEM_UNDO };
    
    if(semop(semid, &buf, 1)) {
    perror("semop");
    exit(1);
    }
}

void passwd_unlock() {
    struct sembuf buf = { 0, 1, SEM_UNDO };
    
    if(semop(semid, &buf, 1)) {
    perror("semop");
    exit(1);
    }
}