busybox

/*

 * CRONTAB

 *

 * usually setuid root, -c option only works if getuid() == geteuid()

 *

 * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)

 * May be distributed under the GNU General Public License

 *

 * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002 to be used in busybox

 *

 */

​

#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

#include <string.h>

#include <errno.h>

#include <time.h>

#include <dirent.h>

#include <fcntl.h>

#include <unistd.h>

#include <syslog.h>

#include <signal.h>

#include <getopt.h>

#include <sys/ioctl.h>

#include <sys/wait.h>

#include <sys/stat.h>

#include <sys/resource.h>

​

#ifndef CRONTABS

#define CRONTABS        "/var/spool/cron/crontabs"

#endif

#ifndef TMPDIR

#define TMPDIR          "/var/spool/cron"

#endif

#ifndef CRONUPDATE

#define CRONUPDATE      "cron.update"

#endif

#ifndef PATH_VI

#define PATH_VI         "/bin/vi"   /* location of vi       */

#endif

​

#include "busybox.h"

​

static const char  *CDir = CRONTABS;

​

static void EditFile(const char *user, const char *file);

static int GetReplaceStream(const char *user, const char *file);

static int  ChangeUser(const char *user, short dochdir);

​

int

crontab_main(int ac, char **av)

{

    enum { NONE, EDIT, LIST, REPLACE, DELETE } option = NONE;

    const struct passwd *pas;

    const char *repFile = NULL;

    int repFd = 0;

    int i;

    char caller[256];           /* user that ran program */

    int   UserId;

​

    UserId = getuid();

    if ((pas = getpwuid(UserId)) == NULL)

    bb_perror_msg_and_die("getpwuid");

​

    strncpy(caller, pas->pw_name, sizeof(caller));

​

    i = 1;

    if (ac > 1) {

    if (av[1][0] == '-' && av[1][1] == 0) {

        option = REPLACE;

        ++i;

    } else if (av[1][0] != '-') {

        option = REPLACE;

        ++i;

        repFile = av[1];

    }

    }

​

    for (; i < ac; ++i) {

    char *ptr = av[i];

​

    if (*ptr != '-')

        break;

    ptr += 2;

​

    switch(ptr[-1]) {

    case 'l':

        if (ptr[-1] == 'l')

        option = LIST;

        /* fall through */

    case 'e':