last_patch63 from vodz: add in crond and crontab applets

4 files changed, 1543 insertions, 0 deletions

diff --git a/miscutils/Makefile.in b/miscutils/Makefile.in
index 078f87001..a5e12e7ee 100644
--- a/miscutils/Makefile.in
+++ b/miscutils/Makefile.in
@@ -25,6 +25,8 @@ endif
 
 MISCUTILS-y:=
 MISCUTILS-$(CONFIG_ADJTIMEX)		+= adjtimex.o
+MISCUTILS-$(CONFIG_CROND)               += crond.o
+MISCUTILS-$(CONFIG_CRONTAB)             += crontab.o
 MISCUTILS-$(CONFIG_DC)			+= dc.o
 MISCUTILS-$(CONFIG_DUTMP)		+= dutmp.o
 MISCUTILS-$(CONFIG_MAKEDEVS)		+= makedevs.o
diff --git a/miscutils/config.in b/miscutils/config.in
index 20310eb6c..1d2751444 100644
--- a/miscutils/config.in
+++ b/miscutils/config.in
@@ -7,6 +7,8 @@ mainmenu_option next_comment
 comment 'Miscellaneous Utilities'
 
 bool 'adjtimex'	    CONFIG_ADJTIMEX
+bool 'crond'        CONFIG_CROND
+bool 'crontab'      CONFIG_CRONTAB
 bool 'dc'	    CONFIG_DC
 bool 'dutmp'	    CONFIG_DUTMP
 bool 'makedevs'	    CONFIG_MAKEDEVS
diff --git a/miscutils/crond.c b/miscutils/crond.c
new file mode 100644
index 000000000..225d5026c
--- /dev/null
+++ b/miscutils/crond.c
@@ -0,0 +1,1146 @@
+/*
+ * crond -d[#] -c <crondir> -f -b
+ *
+ * run as root, but NOT setuid root
+ *
+ * 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
+ */
+
+#define VERSION "2.3.2"
+
+#undef FEATURE_DEBUG_OPT
+
+
+#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 <pwd.h>
+#include <unistd.h>
+#include <grp.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>
+
+#include "busybox.h"
+
+#define arysize(ary)    (sizeof(ary)/sizeof((ary)[0]))
+
+#ifndef CRONTABS
+#define CRONTABS        "/var/spool/cron/crontabs"
+#endif
+#ifndef TMPDIR
+#define TMPDIR          "/var/spool/cron"
+#endif
+#ifndef LOG_FILE
+#define LOG_FILE        "/var/log/cron"
+#endif
+#ifndef SENDMAIL
+#define SENDMAIL        "/usr/sbin/sendmail"
+#endif
+#ifndef SENDMAIL_ARGS
+#define SENDMAIL_ARGS   "-t", "-oem", "-i"
+#endif
+#ifndef CRONUPDATE
+#define CRONUPDATE      "cron.update"
+#endif
+#ifndef MAXLINES
+#define MAXLINES        256             /* max lines in non-root crontabs */
+#endif
+
+
+
+typedef struct CronFile {
+    struct CronFile *cf_Next;
+    struct CronLine *cf_LineBase;
+    char        *cf_User;       /* username                     */
+    int         cf_Ready;       /* bool: one or more jobs ready */
+    int         cf_Running;     /* bool: one or more jobs running */
+    int         cf_Deleted;     /* marked for deletion, ignore  */
+} CronFile;
+
+typedef struct CronLine {
+    struct CronLine *cl_Next;
+    char        *cl_Shell;      /* shell command                        */
+    int         cl_Pid;         /* running pid, 0, or armed (-1)        */
+    int         cl_MailFlag;    /* running pid is for mail              */
+    int         cl_MailPos;     /* 'empty file' size                    */
+    char        cl_Mins[60];    /* 0-59                                 */
+    char        cl_Hrs[24];     /* 0-23                                 */
+    char        cl_Days[32];    /* 1-31                                 */
+    char        cl_Mons[12];    /* 0-11                                 */
+    char        cl_Dow[7];      /* 0-6, beginning sunday                */
+} CronLine;
+
+#define RUN_RANOUT      1
+#define RUN_RUNNING     2
+#define RUN_FAILED      3
+
+#define DaemonUid 0
+
+#ifdef FEATURE_DEBUG_OPT
+static short DebugOpt;
+#endif
+
+static short LogLevel = 8;
+static short ForegroundOpt;
+static short LoggerOpt;
+static const char  *LogFile = LOG_FILE;
+static const char  *CDir = CRONTABS;
+
+static void log(int level, const char *ctl, ...);
+static void log9(const char *ctl, ...);
+static void startlogger(void);
+
+static void CheckUpdates(void);
+static void SynchronizeDir(void);
+static int TestJobs(time_t t1, time_t t2);
+static void RunJobs(void);
+static int CheckJobs(void);
+static void RunJob(CronFile *file, CronLine *line);
+static void EndJob(const CronFile *file, CronLine *line);
+
+static void DeleteFile(const char *userName);
+
+static CronFile *FileBase;
+
+
+int
+crond_main(int ac, char **av)
+{
+    int i;
+
+    opterr = 0;         /* disable getopt 'errors' message.*/
+
+    while ((i = getopt(ac,av,
+#ifdef FEATURE_DEBUG_OPT
+				"d:"
+#endif
+					"l:L:fbSc:")) != EOF){
+
+	switch (i){
+	    case 'l':
+		LogLevel = atoi(optarg);
+		break;
+#ifdef FEATURE_DEBUG_OPT
+	    case 'd':
+		DebugOpt = atoi(optarg);
+		LogLevel = 0;
+		break;
+#endif
+	    case 'f':
+		ForegroundOpt = 1;
+		break;
+	    case 'b':
+		ForegroundOpt = 0;
+		break;
+	    case 'S':                   /* select logging to syslog */
+		LoggerOpt = 0;
+		break;
+	    case 'L':                   /* select internal file logger */
+		LoggerOpt = 1;
+		if (*optarg != 0) LogFile = optarg;
+		break;
+	    case 'c':
+		if (*optarg != 0) CDir = optarg;
+		break;
+	    default: /*  parse error */
+		show_usage();
+	}
+    }
+
+    /*
+     * change directory
+     */
+
+    if (chdir(CDir) != 0)
+	perror_msg_and_die("chdir");
+
+    /*
+     * close stdin and stdout, stderr.
+     * close unused descriptors -  don't need.
+     * optional detach from controlling terminal
+     */
+
+    if (ForegroundOpt == 0) {
+	if(daemon(1, 0) < 0)
+		perror_msg_and_die("daemon");
+    }
+
+    (void)startlogger();                /* need if syslog mode selected */
+    signal(SIGHUP,SIG_IGN);   /* hmm.. but, if kill -HUP original
+				 * version - his died. ;(
+				 */
+
+    /*
+     * main loop - synchronize to 1 second after the minute, minimum sleep
+     *             of 1 second.
+     */
+
+    log(9,"%s " VERSION " dillon, started, log level %d\n", av[0], LogLevel);
+
+    SynchronizeDir();
+
+    {
+	time_t t1 = time(NULL);
+	time_t t2;
+	long dt;
+	short rescan = 60;
+	short sleep_time = 60;
+
+	for (;;) {
+	    sleep((sleep_time + 1) - (short)(time(NULL) % sleep_time));
+
+	    t2 = time(NULL);
+	    dt = t2 - t1;
+
+	    /*
+	     * The file 'cron.update' is checked to determine new cron
+	     * jobs.  The directory is rescanned once an hour to deal
+	     * with any screwups.
+	     *
+	     * check for disparity.  Disparities over an hour either way
+	     * result in resynchronization.  A reverse-indexed disparity
+	     * less then an hour causes us to effectively sleep until we
+	     * match the original time (i.e. no re-execution of jobs that
+	     * have just been run).  A forward-indexed disparity less then
+	     * an hour causes intermediate jobs to be run, but only once
+	     * in the worst case.
+	     *
+	     * when running jobs, the inequality used is greater but not
+	     * equal to t1, and less then or equal to t2.
+	     */
+
+	    if (--rescan == 0) {
+		rescan = 60;
+		SynchronizeDir();
+	    }
+	    CheckUpdates();
+#ifdef FEATURE_DEBUG_OPT
+	    if (DebugOpt)
+		log(5, "Wakeup dt=%d\n", dt);
+#endif
+	    if (dt < -60*60 || dt > 60*60) {
+		t1 = t2;
+		log9("time disparity of %d minutes detected\n", dt / 60);
+	    } else if (dt > 0) {
+		TestJobs(t1, t2);
+		RunJobs();
+		sleep(5);
+		if (CheckJobs() > 0)
+		   sleep_time = 10;
+		else
+		   sleep_time = 60;
+		t1 = t2;
+	    }
+	}
+    }
+    /* not reached */
+}
+
+
+static void
+vlog(int level, int MLOG_LEVEL, const char *ctl, va_list va)
+{
+    char buf[1024];
+    int  logfd;
+
+    if (level >= LogLevel) {
+
+	vsnprintf(buf,sizeof(buf), ctl, va);
+#ifdef FEATURE_DEBUG_OPT
+	if (DebugOpt) fprintf(stderr,"%s",buf);
+	else
+#endif
+	    if (LoggerOpt == 0) syslog(MLOG_LEVEL, "%s", buf);
+	    else {
+		 if ((logfd = open(LogFile,O_WRONLY|O_CREAT|O_APPEND,600)) >= 0){
+		    write(logfd, buf, strlen(buf));
+		    close(logfd);
+		 } else
+#ifdef FEATURE_DEBUG_OPT
+		    perror_msg("Can't open log file")
+#endif
+							;
+	    }
+    }
+}
+
+/*
+	set log_level=9 and log messages
+*/
+
+static void
+log9(const char *ctl, ...)
+{
+    va_list va;
+
+    va_start(va, ctl);
+    vlog(9, LOG_WARNING, ctl, va);
+    va_end(va);
+}
+
+/*
+	normal logger call point.
+*/
+
+static void
+log(int level, const char *ctl, ...)
+{
+    va_list va;
+
+    va_start(va, ctl);
+    vlog(level, LOG_NOTICE, ctl, va);
+    va_end(va);
+}
+
+/*
+	Original: void
+		  logfd(int fd, const char *ctl, ...)
+	Updated to: log_error (used by jobs.c)
+*/
+
+static void
+log_err(const char *ctl, ...)
+{
+    va_list va;
+
+    va_start(va, ctl);
+    vlog(20, LOG_ERR, ctl, va);
+    va_end(va);
+}
+
+/*
+	used by jobs.c (write to temp file..)
+*/
+
+static void
+fdprintf(int fd, const char *ctl, ...)
+{
+    va_list va;
+
+    va_start(va, ctl);
+    vdprintf(fd, ctl, va);
+    va_end(va);
+}
+
+
+static int
+ChangeUser(const char *user, short dochdir)
+{
+    struct passwd *pas;
+
+    /*
+     * Obtain password entry and change privilages
+     */
+
+    if ((pas = getpwnam(user)) == 0) {
+	log(9, "failed to get uid for %s", user);
+	return(-1);
+    }
+    setenv("USER", pas->pw_name, 1);
+    setenv("HOME", pas->pw_dir, 1);
+    setenv("SHELL", "/bin/sh", 1);
+
+    /*
+     * Change running state to the user in question
+     */
+
+    if (initgroups(user, pas->pw_gid) < 0) {
+	log(9, "initgroups failed: %s %m", user);
+	return(-1);
+    }
+    if (setregid(pas->pw_gid, pas->pw_gid) < 0) {
+	log(9, "setregid failed: %s %d", user, pas->pw_gid);
+	return(-1);
+    }
+    if (setreuid(pas->pw_uid, pas->pw_uid) < 0) {
+	log(9, "setreuid failed: %s %d", user, pas->pw_uid);
+	return(-1);
+    }
+    if (dochdir) {
+	if (chdir(pas->pw_dir) < 0) {
+	    log(8, "chdir failed: %s %s", user, pas->pw_dir);
+	    if (chdir(TMPDIR) < 0) {
+		log(9, "chdir failed: %s %s", TMPDIR, user);
+		return(-1);
+	    }
+	}
+    }
+    return(pas->pw_uid);
+}
+
+static void
+startlogger(void)
+{
+    int  logfd;
+
+    if (LoggerOpt == 0)
+	openlog(applet_name, LOG_CONS|LOG_PID,LOG_CRON);
+
+    else { /* test logfile */
+	if ((logfd = open(LogFile,O_WRONLY|O_CREAT|O_APPEND,600)) >= 0)
+	   close(logfd);
+	else
+#ifdef FEATURE_DEBUG_OPT
+	   printf("Failed to open log file '%s' reason: %m", LogFile)
+#endif
+									;
+    }
+}
+
+
+static const char * const DowAry[] = {
+    "sun",
+    "mon",
+    "tue",
+    "wed",
+    "thu",
+    "fri",
+    "sat",
+
+    "Sun",
+    "Mon",
+    "Tue",
+    "Wed",
+    "Thu",
+    "Fri",
+    "Sat",
+    NULL
+};
+
+static const char * const MonAry[] = {
+    "jan",
+    "feb",
+    "mar",
+    "apr",
+    "may",
+    "jun",
+    "jul",
+    "aug",
+    "sep",
+    "oct",
+    "nov",
+    "dec",
+
+    "Jan",
+    "Feb",
+    "Mar",
+    "Apr",
+    "May",
+    "Jun",
+    "Jul",
+    "Aug",
+    "Sep",
+    "Oct",
+    "Nov",
+    "Dec",
+    NULL
+};
+
+static char *
+ParseField(char *user, char *ary, int modvalue, int off,
+				const char * const *names, char *ptr)
+{
+    char *base = ptr;
+    int n1 = -1;
+    int n2 = -1;
+
+    if (base == NULL)
+	return(NULL);
+
+    while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
+	int skip = 0;
+
+	/*
+	 * Handle numeric digit or symbol or '*'
+	 */
+
+	if (*ptr == '*') {
+	    n1 = 0;                     /* everything will be filled */
+	    n2 = modvalue - 1;
+	    skip = 1;
+	    ++ptr;
+	} else if (*ptr >= '0' && *ptr <= '9') {
+	    if (n1 < 0)
+		n1 = strtol(ptr, &ptr, 10) + off;
+	    else
+		n2 = strtol(ptr, &ptr, 10) + off;
+	    skip = 1;
+	} else if (names) {
+	    int i;
+
+	    for (i = 0; names[i]; ++i) {
+		if (strncmp(ptr, names[i], strlen(names[i])) == 0) {
+		    break;
+		}
+	    }
+	    if (names[i]) {
+		ptr += strlen(names[i]);
+		if (n1 < 0)
+		    n1 = i;
+		else
+		    n2 = i;
+		skip = 1;
+	    }
+	}
+
+	/*
+	 * handle optional range '-'
+	 */
+
+	if (skip == 0) {
+	    log9("failed user %s parsing %s\n", user, base);
+	    return(NULL);
+	}
+	if (*ptr == '-' && n2 < 0) {
+	    ++ptr;
+	    continue;
+	}
+
+	/*
+	 * collapse single-value ranges, handle skipmark, and fill
+	 * in the character array appropriately.
+	 */
+
+	if (n2 < 0)
+	    n2 = n1;
+
+	if (*ptr == '/')
+	    skip = strtol(ptr + 1, &ptr, 10);
+
+	/*
+	 * fill array, using a failsafe is the easiest way to prevent
+	 * an endless loop
+	 */
+
+	{
+	    int s0 = 1;
+	    int failsafe = 1024;
+
+	    --n1;
+	    do {
+		n1 = (n1 + 1) % modvalue;
+
+		if (--s0 == 0) {
+		    ary[n1 % modvalue] = 1;
+		    s0 = skip;
+		}
+	    } while (n1 != n2 && --failsafe);
+
+	    if (failsafe == 0) {
+		log9("failed user %s parsing %s\n", user, base);
+		return(NULL);
+	    }
+	}
+	if (*ptr != ',')
+	    break;
+	++ptr;
+	n1 = -1;
+	n2 = -1;
+    }
+
+    if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
+	log9("failed user %s parsing %s\n", user, base);
+	return(NULL);
+    }
+
+    while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')
+	++ptr;
+
+#ifdef FEATURE_DEBUG_OPT
+    if (DebugOpt) {
+	int i;
+
+	for (i = 0; i < modvalue; ++i)
+	    log(5, "%d", ary[i]);
+	log(5, "\n");
+    }
+#endif
+
+    return(ptr);
+}
+
+static void
+FixDayDow(CronLine *line)
+{
+    short i;
+    short weekUsed = 0;
+    short daysUsed = 0;
+
+    for (i = 0; i < arysize(line->cl_Dow); ++i) {
+	if (line->cl_Dow[i] == 0) {
+	    weekUsed = 1;
+	    break;
+	}
+    }
+    for (i = 0; i < arysize(line->cl_Days); ++i) {
+	if (line->cl_Days[i] == 0) {
+	    daysUsed = 1;
+	    break;
+	}
+    }
+    if (weekUsed && !daysUsed) {
+	memset(line->cl_Days, 0, sizeof(line->cl_Days));
+    }
+    if (daysUsed && !weekUsed) {
+	memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
+    }
+}
+
+
+
+static void
+SynchronizeFile(const char *fileName)
+{
+    int maxEntries = MAXLINES;
+    int maxLines;
+    char buf[1024];
+
+    if (strcmp(fileName, "root") == 0)
+	maxEntries = 65535;
+    maxLines = maxEntries * 10;
+
+    if (fileName) {
+	FILE *fi;
+
+	DeleteFile(fileName);
+
+	if ((fi = fopen(fileName, "r")) != NULL) {
+	    struct stat sbuf;
+
+	    if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
+		CronFile *file = calloc(1, sizeof(CronFile));
+		CronLine **pline;
+
+		file->cf_User = strdup(fileName);
+		pline = &file->cf_LineBase;
+
+		while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
+		    CronLine line;
+		    char *ptr;
+
+		    if (buf[0])
+			buf[strlen(buf)-1] = 0;
+
+		    if (buf[0] == 0 || buf[0] == '#' || buf[0] == ' ' || buf[0] == '\t')
+			continue;
+
+		    if (--maxEntries == 0)
+			break;
+
+		    memset(&line, 0, sizeof(line));
+
+#ifdef FEATURE_DEBUG_OPT
+		    if (DebugOpt)
+			log9("User %s Entry %s\n", fileName, buf);
+#endif
+
+		    /*
+		     * parse date ranges
+		     */
+
+		    ptr = ParseField(file->cf_User, line.cl_Mins, 60, 0, NULL, buf);
+		    ptr = ParseField(file->cf_User, line.cl_Hrs,  24, 0, NULL, ptr);
+		    ptr = ParseField(file->cf_User, line.cl_Days, 32, 0, NULL, ptr);
+		    ptr = ParseField(file->cf_User, line.cl_Mons, 12, -1, MonAry, ptr);
+		    ptr = ParseField(file->cf_User, line.cl_Dow, 7, 0, DowAry, ptr);
+
+		    /*
+		     * check failure
+		     */
+
+		    if (ptr == NULL)
+			continue;
+
+		    /*
+		     * fix days and dow - if one is not * and the other
+		     * is *, the other is set to 0, and vise-versa
+		     */
+
+		    FixDayDow(&line);
+
+		    *pline = calloc(1, sizeof(CronLine));
+		    **pline = line;
+
+		    /*
+		     * copy command
+		     */
+
+		    (*pline)->cl_Shell = strdup(ptr);
+
+#ifdef FEATURE_DEBUG_OPT
+		    if (DebugOpt) {
+			log9("    Command %s\n", ptr);
+		    }
+#endif
+
+		    pline = &((*pline)->cl_Next);
+		}
+		*pline = NULL;
+
+		file->cf_Next = FileBase;
+		FileBase = file;
+
+		if (maxLines == 0 || maxEntries == 0)
+		    log9("Maximum number of lines reached for user %s\n", fileName);
+	    }
+	    fclose(fi);
+	}
+    }
+}
+
+static void
+CheckUpdates(void)
+{
+    FILE *fi;
+    char buf[256];
+
+    if ((fi = fopen(CRONUPDATE, "r")) != NULL) {
+	remove(CRONUPDATE);
+	while (fgets(buf, sizeof(buf), fi) != NULL) {
+	    SynchronizeFile(strtok(buf, " \t\r\n"));
+	}
+	fclose(fi);
+    }
+}
+
+static void
+SynchronizeDir(void)
+{
+    /*
+     * Attempt to delete the database.  Note that we have to make a copy
+     * of the string
+     */
+
+    for (;;) {
+	CronFile *file;
+	char *user;
+
+	for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next)
+	    ;
+	if (file == NULL)
+	    break;
+	user = strdup(file->cf_User);
+	DeleteFile(user);
+	free(user);
+    }
+
+    /*
+     * Remove cron update file
+     *
+     * Re-chdir, in case directory was renamed & deleted, or otherwise
+     * screwed up.
+     *
+     * scan directory and add associated users
+     */
+
+    remove(CRONUPDATE);
+    if (chdir(CDir) < 0) {
+	log9("unable to find %s\n", CDir);
+	exit(20);
+    }
+    {
+	DIR *dir;
+	struct dirent *den;
+
+	if ((dir = opendir("."))) {
+	    while ((den = readdir(dir))) {
+		if (strchr(den->d_name, '.') != NULL)
+		    continue;
+		if (getpwnam(den->d_name))
+		    SynchronizeFile(den->d_name);
+		else
+		    log(7, "ignoring %s\n", den->d_name);
+	    }
+	    closedir(dir);
+	} else {
+	    log9("Unable to open current dir!\n");
+	    exit(20);
+	}
+    }
+}
+
+
+/*
+ *  DeleteFile() - delete user database
+ *
+ *  Note: multiple entries for same user may exist if we were unable to
+ *  completely delete a database due to running processes.
+ */
+
+static void
+DeleteFile(const char *userName)
+{
+    CronFile **pfile = &FileBase;
+    CronFile *file;
+
+    while ((file = *pfile) != NULL) {
+	if (strcmp(userName, file->cf_User) == 0) {
+	    CronLine **pline = &file->cf_LineBase;
+	    CronLine *line;
+
+	    file->cf_Running = 0;
+	    file->cf_Deleted = 1;
+
+	    while ((line = *pline) != NULL) {
+		if (line->cl_Pid > 0) {
+		    file->cf_Running = 1;
+		    pline = &line->cl_Next;
+		} else {
+		    *pline = line->cl_Next;
+		    free(line->cl_Shell);
+		    free(line);
+		}
+	    }
+	    if (file->cf_Running == 0) {
+		*pfile = file->cf_Next;
+		free(file->cf_User);
+		free(file);
+	    } else {
+		pfile = &file->cf_Next;
+	    }
+	} else {
+	    pfile = &file->cf_Next;
+	}
+    }
+}
+
+/*
+ * TestJobs()
+ *
+ * determine which jobs need to be run.  Under normal conditions, the
+ * period is about a minute (one scan).  Worst case it will be one
+ * hour (60 scans).
+ */
+
+static int
+TestJobs(time_t t1, time_t t2)
+{
+    short nJobs = 0;
+    time_t t;
+
+    /*
+     * Find jobs > t1 and <= t2
+     */
+
+    for (t = t1 - t1 % 60; t <= t2; t += 60) {
+	if (t > t1) {
+	    struct tm *tp = localtime(&t);
+	    CronFile *file;
+	    CronLine *line;
+
+	    for (file = FileBase; file; file = file->cf_Next) {
+#ifdef FEATURE_DEBUG_OPT
+		if (DebugOpt)
+		    log(5, "FILE %s:\n", file->cf_User);
+#endif
+		if (file->cf_Deleted)
+		    continue;
+		for (line = file->cf_LineBase; line; line = line->cl_Next) {
+#ifdef FEATURE_DEBUG_OPT
+		    if (DebugOpt)
+			log(5, "    LINE %s\n", line->cl_Shell);
+#endif
+		    if (line->cl_Mins[tp->tm_min] &&
+			line->cl_Hrs[tp->tm_hour] &&
+			(line->cl_Days[tp->tm_mday] || line->cl_Dow[tp->tm_wday]) &&
+			line->cl_Mons[tp->tm_mon]
+		    ) {
+#ifdef FEATURE_DEBUG_OPT
+			if (DebugOpt)
+			    log(5, "    JobToDo: %d %s\n", line->cl_Pid, line->cl_Shell);
+#endif
+			if (line->cl_Pid > 0) {
+			    log(8, "    process already running: %s %s\n",
+				file->cf_User,
+				line->cl_Shell
+			    );
+			} else if (line->cl_Pid == 0) {
+			    line->cl_Pid = -1;
+			    file->cf_Ready = 1;
+			    ++nJobs;
+			}
+		    }
+		}
+	    }
+	}
+    }
+    return(nJobs);
+}
+
+static void
+RunJobs(void)
+{
+    CronFile *file;
+    CronLine *line;
+
+    for (file = FileBase; file; file = file->cf_Next) {
+	if (file->cf_Ready) {
+	    file->cf_Ready = 0;
+
+	    for (line = file->cf_LineBase; line; line = line->cl_Next) {
+		if (line->cl_Pid < 0) {
+
+		    RunJob(file, line);
+
+		    log(8, "USER %s pid %3d cmd %s\n",
+			file->cf_User,
+			line->cl_Pid,
+			line->cl_Shell
+		    );
+		    if (line->cl_Pid < 0)
+			file->cf_Ready = 1;
+		    else if (line->cl_Pid > 0)
+			file->cf_Running = 1;
+		}
+	    }
+	}
+    }
+}
+
+/*
+ * CheckJobs() - check for job completion
+ *
+ * Check for job completion, return number of jobs still running after
+ * all done.
+ */
+
+static int
+CheckJobs(void)
+{
+    CronFile *file;
+    CronLine *line;
+    int nStillRunning = 0;
+
+    for (file = FileBase; file; file = file->cf_Next) {
+	if (file->cf_Running) {
+	    file->cf_Running = 0;
+
+	    for (line = file->cf_LineBase; line; line = line->cl_Next) {
+		if (line->cl_Pid > 0) {
+		    int status;
+		    int r = wait4(line->cl_Pid, &status, WNOHANG, NULL);
+
+		    if (r < 0 || r == line->cl_Pid) {
+			EndJob(file, line);
+			if (line->cl_Pid)
+			    file->cf_Running = 1;
+		    } else if (r == 0) {
+			file->cf_Running = 1;
+		    }
+		}
+	    }
+	}
+	nStillRunning += file->cf_Running;
+    }
+    return(nStillRunning);
+}
+
+
+
+static void
+RunJob(CronFile *file, CronLine *line)
+{
+    char mailFile[128];
+    int mailFd;
+
+    line->cl_Pid = 0;
+    line->cl_MailFlag = 0;
+
+    /*
+     * open mail file - owner root so nobody can screw with it.
+     */
+
+    snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d",
+	     file->cf_User, getpid());
+    mailFd = open(mailFile, O_CREAT|O_TRUNC|O_WRONLY|O_EXCL|O_APPEND, 0600);
+
+    if (mailFd >= 0) {
+	line->cl_MailFlag = 1;
+	fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n",
+	    file->cf_User,
+	    line->cl_Shell
+	);
+	line->cl_MailPos = lseek(mailFd, 0, 1);
+    }
+
+    /*
+     * Fork as the user in question and run program
+     */
+
+    if ((line->cl_Pid = fork()) == 0) {
+	/*
+	 * CHILD, FORK OK
+	 */
+
+	/*
+	 * Change running state to the user in question
+	 */
+
+	if (ChangeUser(file->cf_User, 1) < 0)
+	    return;
+
+#ifdef FEATURE_DEBUG_OPT
+	if (DebugOpt)
+	    log(5, "Child Running %s\n", line->cl_Shell);
+#endif
+
+	/*
+	 * stdin is already /dev/null, setup stdout and stderr
+	 */
+
+	if (mailFd >= 0) {
+	    dup2(mailFd, 1);
+	    dup2(mailFd, 2);
+	    close(mailFd);
+	} else {
+	    log_err("unable to create mail file user %s file %s, output to /dev/null\n",
+		file->cf_User,
+		mailFile
+	    );
+	}
+	execl("/bin/sh", "/bin/sh", "-c", line->cl_Shell, NULL, NULL);
+	log_err("unable to exec, user %s cmd /bin/sh -c %s\n",
+	    file->cf_User,
+	    line->cl_Shell
+	);
+	fdprintf(1, "Exec failed: /bin/sh -c %s\n", line->cl_Shell);
+	exit(0);
+    } else if (line->cl_Pid < 0) {
+	/*
+	 * PARENT, FORK FAILED
+	 */
+	log_err("couldn't fork, user %s\n", file->cf_User);
+	line->cl_Pid = 0;
+	remove(mailFile);
+    } else {
+	/*
+	 * PARENT, FORK SUCCESS
+	 *
+	 * rename mail-file based on pid of process
+	 */
+	char mailFile2[128];
+
+	snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d",
+		file->cf_User, line->cl_Pid);
+	rename(mailFile, mailFile2);
+    }
+
+    /*
+     * Close the mail file descriptor.. we can't just leave it open in
+     * a structure, closing it later, because we might run out of descriptors
+     */
+
+    if (mailFd >= 0)
+	close(mailFd);
+}
+
+/*
+ * EndJob - called when job terminates and when mail terminates
+ */
+
+static void
+EndJob(const CronFile *file, CronLine *line)
+{
+    int mailFd;
+    char mailFile[128];
+    struct stat sbuf;
+
+    /*
+     * No job
+     */
+
+    if (line->cl_Pid <= 0) {
+	line->cl_Pid = 0;
+	return;
+    }
+
+    /*
+     * End of job and no mail file
+     * End of sendmail job
+     */
+
+    snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d",
+	     file->cf_User, line->cl_Pid);
+    line->cl_Pid = 0;
+
+    if (line->cl_MailFlag != 1)
+	return;
+
+    line->cl_MailFlag = 0;
+
+    /*
+     * End of primary job - check for mail file.  If size has increased and
+     * the file is still valid, we sendmail it.
+     */
+
+    mailFd = open(mailFile, O_RDONLY);
+    remove(mailFile);
+    if (mailFd < 0) {
+	return;
+    }
+
+    if (fstat(mailFd, &sbuf) < 0 ||
+	sbuf.st_uid != DaemonUid ||
+	sbuf.st_nlink != 0 ||
+	sbuf.st_size == line->cl_MailPos ||
+	!S_ISREG(sbuf.st_mode)
+    ) {
+	close(mailFd);
+	return;
+    }
+
+    if ((line->cl_Pid = fork()) == 0) {
+	/*
+	 * CHILD, FORK OK
+	 */
+
+	/*
+	 * change user id - no way in hell security can be compromised
+	 * by the mailing and we already verified the mail file.
+	 */
+
+	if (ChangeUser(file->cf_User, 1) < 0)
+	    exit(0);
+
+	/*
+	 * run sendmail with mail file as standard input, only if
+	 * mail file exists!
+	 */
+
+	dup2(mailFd, 0);
+	dup2(1, 2);
+	close(mailFd);
+
+	execl(SENDMAIL, SENDMAIL, SENDMAIL_ARGS, NULL, NULL);
+	log_err("unable to exec %s %s, user %s, output to sink null",
+	    SENDMAIL,
+	    SENDMAIL_ARGS,
+	    file->cf_User
+	);
+	exit(0);
+    } else if (line->cl_Pid < 0) {
+	/*
+	 * PARENT, FORK FAILED
+	 */
+	log_err("unable to fork, user %s", file->cf_User);
+	line->cl_Pid = 0;
+    } else {
+	/*
+	 * PARENT, FORK OK
+	 */
+    }
+    close(mailFd);
+}
diff --git a/miscutils/crontab.c b/miscutils/crontab.c
new file mode 100644
index 000000000..c86990653
--- /dev/null
+++ b/miscutils/crontab.c
@@ -0,0 +1,393 @@
+/*
+ * 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 <pwd.h>
+#include <unistd.h>
+#include <grp.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         "/usr/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)
+	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':
+	    if (ptr[-1] == 'e')
+		option = EDIT;
+	    /* fall through */
+	case 'd':
+	    if (ptr[-1] == 'd')
+		option = DELETE;
+	    /* fall through */
+	case 'u':
+	    if (i + 1 < ac && av[i+1][0] != '-') {
+		++i;
+		if (getuid() == geteuid()) {
+		    pas = getpwnam(av[i]);
+		    if (pas) {
+			UserId = pas->pw_uid;
+		    } else {
+			error_msg_and_die("user %s unknown", av[i]);
+		    }
+		} else {
+		    error_msg_and_die("only the superuser may specify a user");
+		}
+	    }
+	    break;
+	case 'c':
+	    if (getuid() == geteuid()) {
+		CDir = (*ptr) ? ptr : av[++i];
+	    } else {
+		error_msg_and_die("-c option: superuser only");
+	    }
+	    break;
+	default:
+	    i = ac;
+	    break;
+	}
+    }
+    if (i != ac || option == NONE)
+	show_usage();
+
+    /*
+     * Get password entry
+     */
+
+    if ((pas = getpwuid(UserId)) == NULL)
+	perror_msg_and_die("getpwuid");
+
+    /*
+     * If there is a replacement file, obtain a secure descriptor to it.
+     */
+
+    if (repFile) {
+	repFd = GetReplaceStream(caller, repFile);
+	if (repFd < 0)
+	    error_msg_and_die("unable to read replacement file");
+    }
+
+    /*
+     * Change directory to our crontab directory
+     */
+
+    if (chdir(CDir) < 0)
+	perror_msg_and_die("cannot change dir to %s", CDir);
+
+    /*
+     * Handle options as appropriate
+     */
+
+    switch(option) {
+    case LIST:
+	{
+	    FILE *fi;
+	    char buf[1024];
+
+	    if ((fi = fopen(pas->pw_name, "r"))) {
+		while (fgets(buf, sizeof(buf), fi) != NULL)
+		    fputs(buf, stdout);
+		fclose(fi);
+	    } else {
+		error_msg("no crontab for %s", pas->pw_name);
+	    }
+	}
+	break;
+    case EDIT:
+	{
+	    FILE *fi;
+	    int fd;
+	    int n;
+	    char tmp[128];
+	    char buf[1024];
+
+	    snprintf(tmp, sizeof(tmp), TMPDIR "/crontab.%d", getpid());
+	    if ((fd = open(tmp, O_RDWR|O_CREAT|O_TRUNC|O_EXCL, 0600)) >= 0) {
+		chown(tmp, getuid(), getgid());
+		if ((fi = fopen(pas->pw_name, "r"))) {
+		    while ((n = fread(buf, 1, sizeof(buf), fi)) > 0)
+			write(fd, buf, n);
+		}
+		EditFile(caller, tmp);
+		remove(tmp);
+		lseek(fd, 0L, 0);
+		repFd = fd;
+	    } else {
+		error_msg_and_die("unable to create %s", tmp);
+	    }
+
+	}
+	option = REPLACE;
+	/* fall through */
+    case REPLACE:
+	{
+	    char buf[1024];
+	    char path[1024];
+	    int fd;
+	    int n;
+
+	    snprintf(path, sizeof(path), "%s.new", pas->pw_name);
+	    if ((fd = open(path, O_CREAT|O_TRUNC|O_EXCL|O_APPEND|O_WRONLY, 0600)) >= 0) {
+		while ((n = read(repFd, buf, sizeof(buf))) > 0) {
+		    write(fd, buf, n);
+		}
+		close(fd);
+		rename(path, pas->pw_name);
+	    } else {
+		error_msg("unable to create %s/%s", CDir, buf);
+	    }
+	    close(repFd);
+	}
+	break;
+    case DELETE:
+	remove(pas->pw_name);
+	break;
+    case NONE:
+    default:
+	break;
+    }
+
+    /*
+     *  Bump notification file.  Handle window where crond picks file up
+     *  before we can write our entry out.
+     */
+
+    if (option == REPLACE || option == DELETE) {
+	FILE *fo;
+	struct stat st;
+
+	while ((fo = fopen(CRONUPDATE, "a"))) {
+	    fprintf(fo, "%s\n", pas->pw_name);
+	    fflush(fo);
+	    if (fstat(fileno(fo), &st) != 0 || st.st_nlink != 0) {
+		fclose(fo);
+		break;
+	    }
+	    fclose(fo);
+	    /* loop */
+	}
+	if (fo == NULL) {
+	    error_msg("unable to append to %s/%s", CDir, CRONUPDATE);
+	}
+    }
+    return 0;
+}
+
+static int
+GetReplaceStream(const char *user, const char *file)
+{
+    int filedes[2];
+    int pid;
+    int fd;
+    int n;
+    char buf[1024];
+
+    if (pipe(filedes) < 0) {
+	perror("pipe");
+	return(-1);
+    }
+    if ((pid = fork()) < 0) {
+	perror("fork");
+	return(-1);
+    }
+    if (pid > 0) {
+	/*
+	 * PARENT
+	 */
+
+	close(filedes[1]);
+	if (read(filedes[0], buf, 1) != 1) {
+	    close(filedes[0]);
+	    filedes[0] = -1;
+	}
+	return(filedes[0]);
+    }
+
+    /*
+     * CHILD
+     */
+
+    close(filedes[0]);
+
+    if (ChangeUser(user, 0) < 0)
+	exit(0);
+
+    fd = open(file, O_RDONLY);
+    if (fd < 0) {
+	error_msg("unable to open %s", file);
+	exit(0);
+    }
+    buf[0] = 0;
+    write(filedes[1], buf, 1);
+    while ((n = read(fd, buf, sizeof(buf))) > 0) {
+	write(filedes[1], buf, n);
+    }
+    exit(0);
+}
+
+static void
+EditFile(const char *user, const char *file)
+{
+    int pid;
+
+    if ((pid = fork()) == 0) {
+	/*
+	 * CHILD - change user and run editor
+	 */
+	char *ptr;
+	char visual[1024];
+
+	if (ChangeUser(user, 1) < 0)
+	    exit(0);
+	if ((ptr = getenv("VISUAL")) == NULL || strlen(ptr) > 256)
+	    ptr = PATH_VI;
+
+	snprintf(visual, sizeof(visual), "%s %s", ptr, file);
+	execl("/bin/sh", "/bin/sh", "-c", visual, NULL);
+	perror("exec");
+	exit(0);
+    }
+    if (pid < 0) {
+	/*
+	 * PARENT - failure
+	 */
+	perror_msg_and_die("fork");
+    }
+    wait4(pid, NULL, 0, NULL);
+}
+
+static void
+log(const char *ctl, ...)
+{
+    va_list va;
+    char buf[1024];
+
+    va_start(va, ctl);
+    vsnprintf(buf, sizeof(buf), ctl, va);
+    syslog(LOG_NOTICE, "%s",buf );
+    va_end(va);
+}
+
+static int
+ChangeUser(const char *user, short dochdir)
+{
+    struct passwd *pas;
+
+    /*
+     * Obtain password entry and change privilages
+     */
+
+    if ((pas = getpwnam(user)) == 0) {
+	log("failed to get uid for %s", user);
+	return(-1);
+    }
+    setenv("USER", pas->pw_name, 1);
+    setenv("HOME", pas->pw_dir, 1);
+    setenv("SHELL", "/bin/sh", 1);
+
+    /*
+     * Change running state to the user in question
+     */
+
+    if (initgroups(user, pas->pw_gid) < 0) {
+	log("initgroups failed: %s %m", user);
+	return(-1);
+    }
+    if (setregid(pas->pw_gid, pas->pw_gid) < 0) {
+	log("setregid failed: %s %d", user, pas->pw_gid);
+	return(-1);
+    }
+    if (setreuid(pas->pw_uid, pas->pw_uid) < 0) {
+	log("setreuid failed: %s %d", user, pas->pw_uid);
+	return(-1);
+    }
+    if (dochdir) {
+	if (chdir(pas->pw_dir) < 0) {
+	    if (chdir(TMPDIR) < 0) {
+		log("chdir failed: %s %s", user, pas->pw_dir);
+		log("chdir failed: %s " TMPDIR, user);
+		return(-1);
+	    }
+	}
+    }
+    return(pas->pw_uid);
+}