mirror of
https://github.com/sheumann/hush.git
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986 lines
20 KiB
C
986 lines
20 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* crond -d[#] -c <crondir> -f -b
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*
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* run as root, but NOT setuid root
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*
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* Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
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* Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#define VERSION "2.3.2"
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#include "libbb.h"
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#include <sys/syslog.h>
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#define arysize(ary) (sizeof(ary)/sizeof((ary)[0]))
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#ifndef CRONTABS
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#define CRONTABS "/var/spool/cron/crontabs"
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#endif
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#ifndef TMPDIR
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#define TMPDIR "/var/spool/cron"
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#endif
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#ifndef SENDMAIL
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#define SENDMAIL "/usr/sbin/sendmail"
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#endif
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#ifndef SENDMAIL_ARGS
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#define SENDMAIL_ARGS "-ti", "oem"
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#endif
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#ifndef CRONUPDATE
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#define CRONUPDATE "cron.update"
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#endif
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#ifndef MAXLINES
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#define MAXLINES 256 /* max lines in non-root crontabs */
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#endif
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typedef struct CronFile {
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struct CronFile *cf_Next;
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struct CronLine *cf_LineBase;
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char *cf_User; /* username */
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int cf_Ready; /* bool: one or more jobs ready */
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int cf_Running; /* bool: one or more jobs running */
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int cf_Deleted; /* marked for deletion, ignore */
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} CronFile;
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typedef struct CronLine {
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struct CronLine *cl_Next;
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char *cl_Shell; /* shell command */
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pid_t cl_Pid; /* running pid, 0, or armed (-1) */
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int cl_MailFlag; /* running pid is for mail */
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int cl_MailPos; /* 'empty file' size */
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char cl_Mins[60]; /* 0-59 */
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char cl_Hrs[24]; /* 0-23 */
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char cl_Days[32]; /* 1-31 */
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char cl_Mons[12]; /* 0-11 */
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char cl_Dow[7]; /* 0-6, beginning sunday */
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} CronLine;
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#define RUN_RANOUT 1
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#define RUN_RUNNING 2
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#define RUN_FAILED 3
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#define DaemonUid 0
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#if ENABLE_DEBUG_CROND_OPTION
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static unsigned DebugOpt;
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#endif
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static unsigned LogLevel = 8;
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static const char *LogFile;
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static const char *CDir = CRONTABS;
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static void startlogger(void);
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static void CheckUpdates(void);
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static void SynchronizeDir(void);
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static int TestJobs(time_t t1, time_t t2);
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static void RunJobs(void);
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static int CheckJobs(void);
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static void RunJob(const char *user, CronLine * line);
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#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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static void EndJob(const char *user, CronLine * line);
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#else
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#define EndJob(user, line) line->cl_Pid = 0
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#endif
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static void DeleteFile(const char *userName);
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static CronFile *FileBase;
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static void crondlog(const char *ctl, ...)
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{
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va_list va;
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const char *fmt;
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int level = (int) (ctl[0] & 0xf);
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int type = level == 20 ?
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LOG_ERR : ((ctl[0] & 0100) ? LOG_WARNING : LOG_NOTICE);
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va_start(va, ctl);
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fmt = ctl + 1;
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if (level >= LogLevel) {
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#if ENABLE_DEBUG_CROND_OPTION
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if (DebugOpt) {
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vfprintf(stderr, fmt, va);
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} else
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#endif
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if (LogFile == 0) {
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vsyslog(type, fmt, va);
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} else {
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#if !ENABLE_DEBUG_CROND_OPTION
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int logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
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#else
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int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
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#endif
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if (logfd >= 0) {
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vdprintf(logfd, fmt, va);
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close(logfd);
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}
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}
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}
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va_end(va);
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if (ctl[0] & 0200) {
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exit(20);
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}
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}
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int crond_main(int ac, char **av);
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int crond_main(int ac, char **av)
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{
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unsigned opt;
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char *lopt, *Lopt, *copt;
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USE_DEBUG_CROND_OPTION(char *dopt;)
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opt_complementary = "f-b:b-f:S-L:L-S" USE_DEBUG_CROND_OPTION(":d-l");
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opterr = 0; /* disable getopt 'errors' message. */
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opt = getopt32(ac, av, "l:L:fbSc:" USE_DEBUG_CROND_OPTION("d:"),
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&lopt, &Lopt, &copt USE_DEBUG_CROND_OPTION(, &dopt));
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if (opt & 1) /* -l */
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LogLevel = xatou(lopt);
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if (opt & 2) /* -L */
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if (*Lopt)
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LogFile = Lopt;
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if (opt & 32) /* -c */
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if (*copt)
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CDir = copt;
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#if ENABLE_DEBUG_CROND_OPTION
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if (opt & 64) { /* -d */
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DebugOpt = xatou(dopt);
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LogLevel = 0;
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}
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#endif
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/* close stdin and stdout, stderr.
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* close unused descriptors - don't need.
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* optional detach from controlling terminal
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*/
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if (!(opt & 4))
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bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, av);
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xchdir(CDir);
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signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
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startlogger(); /* need if syslog mode selected */
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/*
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* main loop - synchronize to 1 second after the minute, minimum sleep
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* of 1 second.
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*/
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crondlog("\011%s " VERSION " dillon, started, log level %d\n",
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applet_name, LogLevel);
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SynchronizeDir();
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{
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time_t t1 = time(NULL);
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time_t t2;
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long dt;
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int rescan = 60;
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short sleep_time = 60;
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write_pidfile("/var/run/crond.pid");
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for (;;) {
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sleep((sleep_time + 1) - (short) (time(NULL) % sleep_time));
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t2 = time(NULL);
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dt = t2 - t1;
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/*
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* The file 'cron.update' is checked to determine new cron
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* jobs. The directory is rescanned once an hour to deal
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* with any screwups.
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*
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* check for disparity. Disparities over an hour either way
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* result in resynchronization. A reverse-indexed disparity
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* less then an hour causes us to effectively sleep until we
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* match the original time (i.e. no re-execution of jobs that
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* have just been run). A forward-indexed disparity less then
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* an hour causes intermediate jobs to be run, but only once
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* in the worst case.
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*
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* when running jobs, the inequality used is greater but not
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* equal to t1, and less then or equal to t2.
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*/
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if (--rescan == 0) {
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rescan = 60;
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SynchronizeDir();
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}
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CheckUpdates();
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#if ENABLE_DEBUG_CROND_OPTION
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if (DebugOpt)
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crondlog("\005Wakeup dt=%d\n", dt);
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#endif
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if (dt < -60 * 60 || dt > 60 * 60) {
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t1 = t2;
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crondlog("\111time disparity of %d minutes detected\n", dt / 60);
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} else if (dt > 0) {
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TestJobs(t1, t2);
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RunJobs();
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sleep(5);
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if (CheckJobs() > 0) {
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sleep_time = 10;
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} else {
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sleep_time = 60;
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}
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t1 = t2;
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}
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}
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}
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return 0; /* not reached */
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}
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static int ChangeUser(const char *user)
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{
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struct passwd *pas;
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const char *err_msg;
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/*
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* Obtain password entry and change privileges
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*/
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pas = getpwnam(user);
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if (pas == 0) {
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crondlog("\011failed to get uid for %s", user);
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return -1;
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}
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setenv("USER", pas->pw_name, 1);
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setenv("HOME", pas->pw_dir, 1);
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setenv("SHELL", DEFAULT_SHELL, 1);
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/*
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* Change running state to the user in question
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*/
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err_msg = change_identity_e2str(pas);
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if (err_msg) {
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crondlog("\011%s for user %s", err_msg, user);
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return -1;
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}
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if (chdir(pas->pw_dir) < 0) {
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crondlog("\011chdir failed: %s: %m", pas->pw_dir);
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if (chdir(TMPDIR) < 0) {
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crondlog("\011chdir failed: %s: %m", TMPDIR);
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return -1;
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}
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}
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return pas->pw_uid;
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}
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static void startlogger(void)
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{
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if (LogFile == 0) {
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openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
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}
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#if ENABLE_DEBUG_CROND_OPTION
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else { /* test logfile */
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int logfd;
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logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
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if (logfd >= 0) {
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close(logfd);
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}
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}
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#endif
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}
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static const char *const DowAry[] = {
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"sun",
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"mon",
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"tue",
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"wed",
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"thu",
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"fri",
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"sat",
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"Sun",
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"Mon",
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"Tue",
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"Wed",
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"Thu",
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"Fri",
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"Sat",
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NULL
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};
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static const char *const MonAry[] = {
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"jan",
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"feb",
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"mar",
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"apr",
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"may",
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"jun",
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"jul",
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"aug",
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"sep",
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"oct",
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"nov",
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"dec",
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"Jan",
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"Feb",
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"Mar",
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"Apr",
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"May",
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"Jun",
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"Jul",
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"Aug",
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"Sep",
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"Oct",
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"Nov",
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"Dec",
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NULL
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};
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static char *ParseField(char *user, char *ary, int modvalue, int off,
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const char *const *names, char *ptr)
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{
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char *base = ptr;
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int n1 = -1;
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int n2 = -1;
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if (base == NULL) {
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return NULL;
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}
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while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
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int skip = 0;
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/* Handle numeric digit or symbol or '*' */
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if (*ptr == '*') {
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n1 = 0; /* everything will be filled */
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n2 = modvalue - 1;
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skip = 1;
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++ptr;
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} else if (*ptr >= '0' && *ptr <= '9') {
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if (n1 < 0) {
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n1 = strtol(ptr, &ptr, 10) + off;
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} else {
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n2 = strtol(ptr, &ptr, 10) + off;
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}
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skip = 1;
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} else if (names) {
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int i;
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for (i = 0; names[i]; ++i) {
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if (strncmp(ptr, names[i], strlen(names[i])) == 0) {
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break;
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}
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}
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if (names[i]) {
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ptr += strlen(names[i]);
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if (n1 < 0) {
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n1 = i;
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} else {
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n2 = i;
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}
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skip = 1;
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}
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}
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/* handle optional range '-' */
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if (skip == 0) {
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crondlog("\111failed user %s parsing %s\n", user, base);
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return NULL;
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}
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if (*ptr == '-' && n2 < 0) {
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++ptr;
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continue;
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}
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/*
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* collapse single-value ranges, handle skipmark, and fill
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* in the character array appropriately.
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*/
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if (n2 < 0) {
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n2 = n1;
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}
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if (*ptr == '/') {
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skip = strtol(ptr + 1, &ptr, 10);
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}
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/*
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* fill array, using a failsafe is the easiest way to prevent
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* an endless loop
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*/
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{
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int s0 = 1;
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int failsafe = 1024;
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--n1;
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do {
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n1 = (n1 + 1) % modvalue;
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if (--s0 == 0) {
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ary[n1 % modvalue] = 1;
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s0 = skip;
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}
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}
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while (n1 != n2 && --failsafe);
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if (failsafe == 0) {
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crondlog("\111failed user %s parsing %s\n", user, base);
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return NULL;
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}
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}
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if (*ptr != ',') {
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break;
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}
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++ptr;
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n1 = -1;
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n2 = -1;
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}
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if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
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crondlog("\111failed user %s parsing %s\n", user, base);
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return NULL;
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}
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while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n') {
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++ptr;
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}
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#if ENABLE_DEBUG_CROND_OPTION
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if (DebugOpt) {
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int i;
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for (i = 0; i < modvalue; ++i) {
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crondlog("\005%d", ary[i]);
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}
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crondlog("\005\n");
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}
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#endif
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return ptr;
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}
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static void FixDayDow(CronLine * line)
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{
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int i;
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int weekUsed = 0;
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int daysUsed = 0;
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for (i = 0; i < (int)(arysize(line->cl_Dow)); ++i) {
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if (line->cl_Dow[i] == 0) {
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weekUsed = 1;
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break;
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}
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}
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for (i = 0; i < (int)(arysize(line->cl_Days)); ++i) {
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if (line->cl_Days[i] == 0) {
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daysUsed = 1;
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break;
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}
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}
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if (weekUsed && !daysUsed) {
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memset(line->cl_Days, 0, sizeof(line->cl_Days));
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}
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if (daysUsed && !weekUsed) {
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memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
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}
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}
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static void SynchronizeFile(const char *fileName)
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{
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int maxEntries = MAXLINES;
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int maxLines;
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char buf[1024];
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if (strcmp(fileName, "root") == 0) {
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maxEntries = 65535;
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}
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maxLines = maxEntries * 10;
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if (fileName) {
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FILE *fi;
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DeleteFile(fileName);
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fi = fopen(fileName, "r");
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if (fi != NULL) {
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struct stat sbuf;
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if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
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CronFile *file = xzalloc(sizeof(CronFile));
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CronLine **pline;
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file->cf_User = strdup(fileName);
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pline = &file->cf_LineBase;
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while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
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CronLine line;
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char *ptr;
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trim(buf);
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if (buf[0] == 0 || buf[0] == '#') {
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continue;
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}
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if (--maxEntries == 0) {
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break;
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}
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memset(&line, 0, sizeof(line));
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#if ENABLE_DEBUG_CROND_OPTION
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if (DebugOpt) {
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crondlog("\111User %s Entry %s\n", fileName, buf);
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}
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#endif
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/* parse date ranges */
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ptr = ParseField(file->cf_User, line.cl_Mins, 60, 0, NULL, buf);
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ptr = ParseField(file->cf_User, line.cl_Hrs, 24, 0, NULL, ptr);
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ptr = ParseField(file->cf_User, line.cl_Days, 32, 0, NULL, ptr);
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ptr = ParseField(file->cf_User, line.cl_Mons, 12, -1, MonAry, ptr);
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ptr = ParseField(file->cf_User, line.cl_Dow, 7, 0, DowAry, ptr);
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/* check failure */
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if (ptr == NULL) {
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continue;
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}
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/*
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* fix days and dow - if one is not * and the other
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* is *, the other is set to 0, and vise-versa
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*/
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FixDayDow(&line);
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*pline = xzalloc(sizeof(CronLine));
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**pline = line;
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/* copy command */
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(*pline)->cl_Shell = strdup(ptr);
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#if ENABLE_DEBUG_CROND_OPTION
|
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if (DebugOpt) {
|
|
crondlog("\111 Command %s\n", ptr);
|
|
}
|
|
#endif
|
|
|
|
pline = &((*pline)->cl_Next);
|
|
}
|
|
*pline = NULL;
|
|
|
|
file->cf_Next = FileBase;
|
|
FileBase = file;
|
|
|
|
if (maxLines == 0 || maxEntries == 0) {
|
|
crondlog("\111Maximum number of lines reached for user %s\n", fileName);
|
|
}
|
|
}
|
|
fclose(fi);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void CheckUpdates(void)
|
|
{
|
|
FILE *fi;
|
|
char buf[256];
|
|
|
|
fi = fopen(CRONUPDATE, "r");
|
|
if (fi != 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. */
|
|
|
|
for (;;) {
|
|
CronFile *file;
|
|
|
|
for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next);
|
|
if (file == NULL) {
|
|
break;
|
|
}
|
|
DeleteFile(file->cf_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) {
|
|
crondlog("\311cannot find %s\n", CDir);
|
|
}
|
|
{
|
|
DIR *dir = opendir(".");
|
|
struct dirent *den;
|
|
|
|
if (dir) {
|
|
while ((den = readdir(dir))) {
|
|
if (strchr(den->d_name, '.') != NULL) {
|
|
continue;
|
|
}
|
|
if (getpwnam(den->d_name)) {
|
|
SynchronizeFile(den->d_name);
|
|
} else {
|
|
crondlog("\007ignoring %s\n", den->d_name);
|
|
}
|
|
}
|
|
closedir(dir);
|
|
} else {
|
|
crondlog("\311cannot open current dir!\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
int 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) {
|
|
#if ENABLE_DEBUG_CROND_OPTION
|
|
if (DebugOpt)
|
|
crondlog("\005FILE %s:\n", file->cf_User);
|
|
#endif
|
|
if (file->cf_Deleted)
|
|
continue;
|
|
for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
|
#if ENABLE_DEBUG_CROND_OPTION
|
|
if (DebugOpt)
|
|
crondlog("\005 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]) {
|
|
#if ENABLE_DEBUG_CROND_OPTION
|
|
if (DebugOpt) {
|
|
crondlog("\005 JobToDo: %d %s\n",
|
|
line->cl_Pid, line->cl_Shell);
|
|
}
|
|
#endif
|
|
if (line->cl_Pid > 0) {
|
|
crondlog("\010 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->cf_User, line);
|
|
|
|
crondlog("\010USER %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->cf_User, line);
|
|
if (line->cl_Pid) {
|
|
file->cf_Running = 1;
|
|
}
|
|
} else if (r == 0) {
|
|
file->cf_Running = 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
nStillRunning += file->cf_Running;
|
|
}
|
|
return nStillRunning;
|
|
}
|
|
|
|
|
|
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
|
static void
|
|
ForkJob(const char *user, CronLine * line, int mailFd,
|
|
const char *prog, const char *cmd, const char *arg, const char *mailf)
|
|
{
|
|
/* Fork as the user in question and run program */
|
|
pid_t pid = fork();
|
|
|
|
line->cl_Pid = pid;
|
|
if (pid == 0) {
|
|
/* CHILD */
|
|
|
|
/* Change running state to the user in question */
|
|
|
|
if (ChangeUser(user) < 0) {
|
|
exit(0);
|
|
}
|
|
#if ENABLE_DEBUG_CROND_OPTION
|
|
if (DebugOpt) {
|
|
crondlog("\005Child Running %s\n", prog);
|
|
}
|
|
#endif
|
|
|
|
if (mailFd >= 0) {
|
|
dup2(mailFd, mailf != NULL);
|
|
dup2((mailf ? mailFd : 1), 2);
|
|
close(mailFd);
|
|
}
|
|
execl(prog, prog, cmd, arg, NULL);
|
|
crondlog("\024cannot exec, user %s cmd %s %s %s\n", user, prog, cmd, arg);
|
|
if (mailf) {
|
|
fdprintf(1, "Exec failed: %s -c %s\n", prog, arg);
|
|
}
|
|
exit(0);
|
|
} else if (pid < 0) {
|
|
/* FORK FAILED */
|
|
crondlog("\024cannot fork, user %s\n", user);
|
|
line->cl_Pid = 0;
|
|
if (mailf) {
|
|
remove(mailf);
|
|
}
|
|
} else if (mailf) {
|
|
/* PARENT, FORK SUCCESS
|
|
* rename mail-file based on pid of process
|
|
*/
|
|
char mailFile2[128];
|
|
|
|
snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d", user, pid);
|
|
rename(mailf, 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);
|
|
}
|
|
}
|
|
|
|
static void RunJob(const char *user, 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", 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", user,
|
|
line->cl_Shell);
|
|
line->cl_MailPos = lseek(mailFd, 0, SEEK_CUR);
|
|
} else {
|
|
crondlog("\024cannot create mail file user %s file %s, output to /dev/null\n", user, mailFile);
|
|
}
|
|
|
|
ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
|
|
}
|
|
|
|
/*
|
|
* EndJob - called when job terminates and when mail terminates
|
|
*/
|
|
|
|
static void EndJob(const char *user, 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", 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;
|
|
}
|
|
ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
|
|
}
|
|
#else
|
|
/* crond without sendmail */
|
|
|
|
static void RunJob(const char *user, CronLine * line)
|
|
{
|
|
/* Fork as the user in question and run program */
|
|
pid_t pid = fork();
|
|
|
|
if (pid == 0) {
|
|
/* CHILD */
|
|
|
|
/* Change running state to the user in question */
|
|
|
|
if (ChangeUser(user) < 0) {
|
|
exit(0);
|
|
}
|
|
#if ENABLE_DEBUG_CROND_OPTION
|
|
if (DebugOpt) {
|
|
crondlog("\005Child Running %s\n", DEFAULT_SHELL);
|
|
}
|
|
#endif
|
|
|
|
execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_Shell, NULL);
|
|
crondlog("\024cannot exec, user %s cmd %s -c %s\n", user,
|
|
DEFAULT_SHELL, line->cl_Shell);
|
|
exit(0);
|
|
} else if (pid < 0) {
|
|
/* FORK FAILED */
|
|
crondlog("\024cannot, user %s\n", user);
|
|
pid = 0;
|
|
}
|
|
line->cl_Pid = pid;
|
|
}
|
|
#endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|