* run as root, but NOT setuid root
*
* Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
+ * (version 2.3.2)
* Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-#define VERSION "2.3.2"
-
-#include "busybox.h"
-#include <sys/syslog.h>
+//usage:#define crond_trivial_usage
+//usage: "-fbS -l N " IF_FEATURE_CROND_D("-d N ") "-L LOGFILE -c DIR"
+//usage:#define crond_full_usage "\n\n"
+//usage: " -f Foreground"
+//usage: "\n -b Background (default)"
+//usage: "\n -S Log to syslog (default)"
+//usage: "\n -l Set log level. 0 is the most verbose, default 8"
+//usage: IF_FEATURE_CROND_D(
+//usage: "\n -d Set log level, log to stderr"
+//usage: )
+//usage: "\n -L Log to file"
+//usage: "\n -c Working dir"
+
+#include "libbb.h"
+#include <syslog.h>
+
+/* glibc frees previous setenv'ed value when we do next setenv()
+ * of the same variable. uclibc does not do this! */
+#if (defined(__GLIBC__) && !defined(__UCLIBC__)) /* || OTHER_SAFE_LIBC... */
+# define SETENV_LEAKS 0
+#else
+# define SETENV_LEAKS 1
+#endif
-#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
+#define TMPDIR CONFIG_FEATURE_CROND_DIR
+#define CRONTABS CONFIG_FEATURE_CROND_DIR "/crontabs"
#ifndef SENDMAIL
-#define SENDMAIL "/usr/sbin/sendmail"
+# define SENDMAIL "sendmail"
#endif
#ifndef SENDMAIL_ARGS
-#define SENDMAIL_ARGS "-ti", "oem"
+# define SENDMAIL_ARGS "-ti"
#endif
#ifndef CRONUPDATE
-#define CRONUPDATE "cron.update"
+# define CRONUPDATE "cron.update"
#endif
#ifndef MAXLINES
-#define MAXLINES 256 /* max lines in non-root crontabs */
+# 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 */
+ struct CronFile *cf_next;
+ struct CronLine *cf_lines;
+ char *cf_username;
+ smallint cf_wants_starting; /* bool: one or more jobs ready */
+ smallint cf_has_running; /* bool: one or more jobs running */
+ smallint cf_deleted; /* marked for deletion (but still has running jobs) */
} CronFile;
typedef struct CronLine {
- struct CronLine *cl_Next;
- char *cl_Shell; /* shell command */
- pid_t 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
-
-#if ENABLE_DEBUG_CROND_OPTION
-static unsigned DebugOpt;
+ struct CronLine *cl_next;
+ char *cl_cmd; /* shell command */
+ pid_t cl_pid; /* >0:running, <0:needs to be started in this minute, 0:dormant */
+#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
+ int cl_empty_mail_size; /* size of mail header only, 0 if no mailfile */
+ char *cl_mailto; /* whom to mail results, may be NULL */
#endif
+ /* ordered by size, not in natural order. makes code smaller: */
+ char cl_Dow[7]; /* 0-6, beginning sunday */
+ char cl_Mons[12]; /* 0-11 */
+ char cl_Hrs[24]; /* 0-23 */
+ char cl_Days[32]; /* 1-31 */
+ char cl_Mins[60]; /* 0-59 */
+} CronLine;
-static unsigned LogLevel = 8;
-static const char *LogFile;
-static const char *CDir = CRONTABS;
-
-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);
+#define DAEMON_UID 0
-static void RunJob(const char *user, CronLine * line);
-#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
-static void EndJob(const char *user, CronLine * line);
+enum {
+ OPT_l = (1 << 0),
+ OPT_L = (1 << 1),
+ OPT_f = (1 << 2),
+ OPT_b = (1 << 3),
+ OPT_S = (1 << 4),
+ OPT_c = (1 << 5),
+ OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D,
+};
+#if ENABLE_FEATURE_CROND_D
+# define DebugOpt (option_mask32 & OPT_d)
#else
-#define EndJob(user, line) line->cl_Pid = 0
+# define DebugOpt 0
#endif
-static void DeleteFile(const char *userName);
-
-static CronFile *FileBase;
-
+struct globals {
+ unsigned log_level; /* = 8; */
+ time_t crontab_dir_mtime;
+ const char *log_filename;
+ const char *crontab_dir_name; /* = CRONTABS; */
+ CronFile *cron_files;
+#if SETENV_LEAKS
+ char *env_var_user;
+ char *env_var_home;
+#endif
+} FIX_ALIASING;
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { \
+ G.log_level = 8; \
+ G.crontab_dir_name = CRONTABS; \
+} while (0)
+
+
+/* 0 is the most verbose, default 8 */
+#define LVL5 "\x05"
+#define LVL7 "\x07"
+#define LVL8 "\x08"
+#define WARN9 "\x49"
+#define DIE9 "\xc9"
+/* level >= 20 is "error" */
+#define ERR20 "\x14"
+
+static void crondlog(const char *ctl, ...) __attribute__ ((format (printf, 1, 2)));
static void crondlog(const char *ctl, ...)
{
va_list va;
- const char *fmt;
- int level = (int) (ctl[0] & 0xf);
- int type = level == 20 ?
- LOG_ERR : ((ctl[0] & 0100) ? LOG_WARNING : LOG_NOTICE);
-
+ int level = (ctl[0] & 0x1f);
va_start(va, ctl);
- fmt = ctl + 1;
- if (level >= LogLevel) {
-
-#if ENABLE_DEBUG_CROND_OPTION
- if (DebugOpt) {
- vfprintf(stderr, fmt, va);
- } else
-#endif
- if (LogFile == 0) {
- vsyslog(type, fmt, va);
+ if (level >= (int)G.log_level) {
+ /* Debug mode: all to (non-redirected) stderr, */
+ /* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
+ if (!DebugOpt && G.log_filename) {
+ /* Otherwise (log to file): we reopen log file at every write: */
+ int logfd = open_or_warn(G.log_filename, O_WRONLY | O_CREAT | O_APPEND);
+ if (logfd >= 0)
+ xmove_fd(logfd, STDERR_FILENO);
+ }
+ /* When we log to syslog, level > 8 is logged at LOG_ERR
+ * syslog level, level <= 8 is logged at LOG_INFO. */
+ if (level > 8) {
+ bb_verror_msg(ctl + 1, va, /* strerr: */ NULL);
} else {
- int logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
- if (logfd >= 0) {
- vdprintf(logfd, fmt, va);
- close(logfd);
-#if ENABLE_DEBUG_CROND_OPTION
- } else {
- bb_perror_msg("can't open log file");
-#endif
- }
+ char *msg = NULL;
+ vasprintf(&msg, ctl + 1, va);
+ bb_info_msg("%s: %s", applet_name, msg);
+ free(msg);
}
}
va_end(va);
- if (ctl[0] & 0200) {
+ if (ctl[0] & 0x80)
exit(20);
- }
-}
-
-int crond_main(int ac, char **av)
-{
- unsigned opt;
- char *lopt, *Lopt, *copt;
-
-#if ENABLE_DEBUG_CROND_OPTION
- char *dopt;
-
- opt_complementary = "f-b:b-f:S-L:L-S:d-l";
-#else
- opt_complementary = "f-b:b-f:S-L:L-S";
-#endif
-
- opterr = 0; /* disable getopt 'errors' message. */
- opt = getopt32(ac, av, "l:L:fbSc:"
-#if ENABLE_DEBUG_CROND_OPTION
- "d:"
-#endif
- , &lopt, &Lopt, &copt
-#if ENABLE_DEBUG_CROND_OPTION
- , &dopt
-#endif
- );
- if (opt & 1) {
- LogLevel = xatou(lopt);
- }
- if (opt & 2) {
- if (*Lopt != 0) {
- LogFile = Lopt;
- }
- }
- if (opt & 32) {
- if (*copt != 0) {
- CDir = copt;
- }
- }
-#if ENABLE_DEBUG_CROND_OPTION
- if (opt & 64) {
- DebugOpt = xatou(dopt);
- LogLevel = 0;
- }
-#endif
-
- /*
- * change directory
- */
-
- xchdir(CDir);
- signal(SIGHUP, SIG_IGN); /* hmm.. but, if kill -HUP original
- * version - his died. ;(
- */
- /*
- * close stdin and stdout, stderr.
- * close unused descriptors - don't need.
- * optional detach from controlling terminal
- */
-
- if (!(opt & 4)) {
-#ifdef BB_NOMMU
- /* reexec for vfork() do continue parent */
- vfork_daemon_rexec(1, 0, ac, av, "-f");
-#else
- xdaemon(1, 0);
-#endif
- }
-
- (void) startlogger(); /* need if syslog mode selected */
-
- /*
- * main loop - synchronize to 1 second after the minute, minimum sleep
- * of 1 second.
- */
-
- crondlog("\011%s " VERSION " dillon, started, log level %d\n",
- applet_name, LogLevel);
-
- SynchronizeDir();
-
- {
- time_t t1 = time(NULL);
- time_t t2;
- long dt;
- int 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();
-#if ENABLE_DEBUG_CROND_OPTION
- if (DebugOpt)
- crondlog("\005Wakeup dt=%d\n", dt);
-#endif
- if (dt < -60 * 60 || dt > 60 * 60) {
- t1 = t2;
- crondlog("\111time 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;
- }
- }
- }
- bb_fflush_stdout_and_exit(EXIT_SUCCESS); /* not reached */
-}
-
-static int ChangeUser(const char *user)
-{
- struct passwd *pas;
- const char *err_msg;
-
- /*
- * Obtain password entry and change privileges
- */
- pas = getpwnam(user);
- if (pas == 0) {
- crondlog("\011failed to get uid for %s", user);
- return (-1);
- }
- setenv("USER", pas->pw_name, 1);
- setenv("HOME", pas->pw_dir, 1);
- setenv("SHELL", DEFAULT_SHELL, 1);
-
- /*
- * Change running state to the user in question
- */
- err_msg = change_identity_e2str(pas);
- if (err_msg) {
- crondlog("\011%s for user %s", err_msg, user);
- return (-1);
- }
- if (chdir(pas->pw_dir) < 0) {
- crondlog("\011chdir failed: %s: %m", pas->pw_dir);
- if (chdir(TMPDIR) < 0) {
- crondlog("\011chdir failed: %s: %m", TMPDIR);
- return (-1);
- }
- }
- return (pas->pw_uid);
-}
-
-static void startlogger(void)
-{
- if (LogFile == 0) {
- openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
- }
-#if ENABLE_DEBUG_CROND_OPTION
- else { /* test logfile */
- int logfd;
-
- if ((logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600)) >= 0) {
- close(logfd);
- } else {
- bb_perror_msg("failed to open log file '%s': ", LogFile);
- }
- }
-#endif
}
+static const char DowAry[] ALIGN1 =
+ "sun""mon""tue""wed""thu""fri""sat"
+ /* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
+;
-static const char *const DowAry[] = {
- "sun",
- "mon",
- "tue",
- "wed",
- "thu",
- "fri",
- "sat",
-
- "Sun",
- "Mon",
- "Tue",
- "Wed",
- "Thu",
- "Fri",
- "Sat",
- NULL
-};
+static const char MonAry[] ALIGN1 =
+ "jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
+ /* "Jan""Feb""Mar""Apr""May""Jun""Jul""Aug""Sep""Oct""Nov""Dec" */
+;
-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)
+static void ParseField(char *user, char *ary, int modvalue, int off,
+ const char *names, char *ptr)
+/* 'names' is a pointer to a set of 3-char abbreviations */
{
char *base = ptr;
int n1 = -1;
int n2 = -1;
- if (base == NULL) {
- return (NULL);
- }
+ // this can't happen due to config_read()
+ /*if (base == NULL)
+ return;*/
- while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
+ while (1) {
int skip = 0;
/* Handle numeric digit or symbol or '*' */
-
if (*ptr == '*') {
- n1 = 0; /* everything will be filled */
+ n1 = 0; /* everything will be filled */
n2 = modvalue - 1;
skip = 1;
++ptr;
- } else if (*ptr >= '0' && *ptr <= '9') {
+ } else if (isdigit(*ptr)) {
+ char *endp;
if (n1 < 0) {
- n1 = strtol(ptr, &ptr, 10) + off;
+ n1 = strtol(ptr, &endp, 10) + off;
} else {
- n2 = strtol(ptr, &ptr, 10) + off;
+ n2 = strtol(ptr, &endp, 10) + off;
}
+ ptr = endp; /* gcc likes temp var for &endp */
skip = 1;
} else if (names) {
int i;
- for (i = 0; names[i]; ++i) {
- if (strncmp(ptr, names[i], strlen(names[i])) == 0) {
+ for (i = 0; names[i]; i += 3) {
+ /* was using strncmp before... */
+ if (strncasecmp(ptr, &names[i], 3) == 0) {
+ ptr += 3;
+ if (n1 < 0) {
+ n1 = i / 3;
+ } else {
+ n2 = i / 3;
+ }
+ skip = 1;
break;
}
}
- if (names[i]) {
- ptr += strlen(names[i]);
- if (n1 < 0) {
- n1 = i;
- } else {
- n2 = i;
- }
- skip = 1;
- }
}
/* handle optional range '-' */
-
if (skip == 0) {
- crondlog("\111failed user %s parsing %s\n", user, base);
- return (NULL);
+ goto err;
}
if (*ptr == '-' && n2 < 0) {
++ptr;
* 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);
+ char *endp;
+ skip = strtol(ptr + 1, &endp, 10);
+ ptr = endp; /* gcc likes temp var for &endp */
}
+
/*
* fill array, using a failsafe is the easiest way to prevent
* an endless loop
*/
-
{
int s0 = 1;
int failsafe = 1024;
ary[n1 % modvalue] = 1;
s0 = skip;
}
- }
- while (n1 != n2 && --failsafe);
-
- if (failsafe == 0) {
- crondlog("\111failed user %s parsing %s\n", user, base);
- return (NULL);
- }
+ if (--failsafe == 0) {
+ goto err;
+ }
+ } while (n1 != n2);
}
if (*ptr != ',') {
break;
n2 = -1;
}
- if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
- crondlog("\111failed user %s parsing %s\n", user, base);
- return (NULL);
+ if (*ptr) {
+ err:
+ crondlog(WARN9 "user %s: parse error at %s", user, base);
+ return;
}
- while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n') {
- ++ptr;
- }
-#if ENABLE_DEBUG_CROND_OPTION
- if (DebugOpt) {
+ if (DebugOpt && (G.log_level <= 5)) { /* like LVL5 */
+ /* can't use crondlog, it inserts '\n' */
int i;
-
- for (i = 0; i < modvalue; ++i) {
- crondlog("\005%d", ary[i]);
- }
- crondlog("\005\n");
+ for (i = 0; i < modvalue; ++i)
+ fprintf(stderr, "%d", (unsigned char)ary[i]);
+ bb_putchar_stderr('\n');
}
-#endif
-
- return (ptr);
}
-static void FixDayDow(CronLine * line)
+static void FixDayDow(CronLine *line)
{
- int i;
+ unsigned i;
int weekUsed = 0;
int daysUsed = 0;
- for (i = 0; i < (int)(arysize(line->cl_Dow)); ++i) {
+ for (i = 0; i < ARRAY_SIZE(line->cl_Dow); ++i) {
if (line->cl_Dow[i] == 0) {
weekUsed = 1;
break;
}
}
- for (i = 0; i < (int)(arysize(line->cl_Days)); ++i) {
+ for (i = 0; i < ARRAY_SIZE(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));
+ if (weekUsed != daysUsed) {
+ if (weekUsed)
+ memset(line->cl_Days, 0, sizeof(line->cl_Days));
+ else /* daysUsed */
+ memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
}
}
-
-
-static void SynchronizeFile(const char *fileName)
+/*
+ * delete_cronfile() - delete user database
+ *
+ * Note: multiple entries for same user may exist if we were unable to
+ * completely delete a database due to running processes.
+ */
+//FIXME: we will start a new job even if the old job is running
+//if crontab was reloaded: crond thinks that "new" job is different from "old"
+//even if they are in fact completely the same. Example
+//Crontab was:
+// 0-59 * * * * job1
+// 0-59 * * * * long_running_job2
+//User edits crontab to:
+// 0-59 * * * * job1_updated
+// 0-59 * * * * long_running_job2
+//Bug: crond can now start another long_running_job2 even if old one
+//is still running.
+//OTOH most other versions of cron do not wait for job termination anyway,
+//they end up with multiple copies of jobs if they don't terminate soon enough.
+static void delete_cronfile(const char *userName)
{
- int maxEntries = MAXLINES;
- int maxLines;
- char buf[1024];
-
- if (strcmp(fileName, "root") == 0) {
- maxEntries = 65535;
- }
- maxLines = maxEntries * 10;
-
- if (fileName) {
- FILE *fi;
+ CronFile **pfile = &G.cron_files;
+ CronFile *file;
- DeleteFile(fileName);
+ while ((file = *pfile) != NULL) {
+ if (strcmp(userName, file->cf_username) == 0) {
+ CronLine **pline = &file->cf_lines;
+ CronLine *line;
- fi = fopen(fileName, "r");
- if (fi != NULL) {
- struct stat sbuf;
+ file->cf_has_running = 0;
+ file->cf_deleted = 1;
- if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
- CronFile *file = calloc(1, sizeof(CronFile));
- CronLine **pline;
+ while ((line = *pline) != NULL) {
+ if (line->cl_pid > 0) {
+ file->cf_has_running = 1;
+ pline = &line->cl_next;
+ } else {
+ *pline = line->cl_next;
+ free(line->cl_cmd);
+ free(line);
+ }
+ }
+ if (file->cf_has_running == 0) {
+ *pfile = file->cf_next;
+ free(file->cf_username);
+ free(file);
+ continue;
+ }
+ }
+ pfile = &file->cf_next;
+ }
+}
- file->cf_User = strdup(fileName);
- pline = &file->cf_LineBase;
+static void load_crontab(const char *fileName)
+{
+ struct parser_t *parser;
+ struct stat sbuf;
+ int maxLines;
+ char *tokens[6];
+#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
+ char *mailTo = NULL;
+#endif
- while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
- CronLine line;
- char *ptr;
+ delete_cronfile(fileName);
- trim(buf);
- if (buf[0] == 0 || buf[0] == '#') {
- continue;
- }
- if (--maxEntries == 0) {
- break;
- }
- memset(&line, 0, sizeof(line));
+ if (!getpwnam(fileName)) {
+ crondlog(LVL7 "ignoring file '%s' (no such user)", fileName);
+ return;
+ }
-#if ENABLE_DEBUG_CROND_OPTION
- if (DebugOpt) {
- crondlog("\111User %s Entry %s\n", fileName, buf);
- }
-#endif
+ parser = config_open(fileName);
+ if (!parser)
+ return;
- /* 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);
+ maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES;
- /* check failure */
- if (ptr == NULL) {
- continue;
- }
+ if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DAEMON_UID) {
+ CronFile *file = xzalloc(sizeof(CronFile));
+ CronLine **pline;
+ int n;
- /*
- * fix days and dow - if one is not * and the other
- * is *, the other is set to 0, and vise-versa
- */
+ file->cf_username = xstrdup(fileName);
+ pline = &file->cf_lines;
- FixDayDow(&line);
+ while (1) {
+ CronLine *line;
- *pline = calloc(1, sizeof(CronLine));
- **pline = line;
+ if (!--maxLines)
+ break;
+ n = config_read(parser, tokens, 6, 1, "# \t", PARSE_NORMAL | PARSE_KEEP_COPY);
+ if (!n)
+ break;
- /* copy command */
- (*pline)->cl_Shell = strdup(ptr);
+ if (DebugOpt)
+ crondlog(LVL5 "user:%s entry:%s", fileName, parser->data);
-#if ENABLE_DEBUG_CROND_OPTION
- if (DebugOpt) {
- crondlog("\111 Command %s\n", ptr);
- }
+ /* check if line is setting MAILTO= */
+ if (0 == strncmp(tokens[0], "MAILTO=", 7)) {
+#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
+ free(mailTo);
+ mailTo = (tokens[0][7]) ? xstrdup(&tokens[0][7]) : NULL;
+#endif /* otherwise just ignore such lines */
+ continue;
+ }
+ /* check if a minimum of tokens is specified */
+ if (n < 6)
+ continue;
+ *pline = line = xzalloc(sizeof(*line));
+ /* parse date ranges */
+ ParseField(file->cf_username, line->cl_Mins, 60, 0, NULL, tokens[0]);
+ ParseField(file->cf_username, line->cl_Hrs, 24, 0, NULL, tokens[1]);
+ ParseField(file->cf_username, line->cl_Days, 32, 0, NULL, tokens[2]);
+ ParseField(file->cf_username, line->cl_Mons, 12, -1, MonAry, tokens[3]);
+ ParseField(file->cf_username, line->cl_Dow, 7, 0, DowAry, tokens[4]);
+ /*
+ * fix days and dow - if one is not "*" and the other
+ * is "*", the other is set to 0, and vise-versa
+ */
+ FixDayDow(line);
+#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
+ /* copy mailto (can be NULL) */
+ line->cl_mailto = xstrdup(mailTo);
#endif
+ /* copy command */
+ line->cl_cmd = xstrdup(tokens[5]);
+ if (DebugOpt) {
+ crondlog(LVL5 " command:%s", tokens[5]);
+ }
+ pline = &line->cl_next;
+//bb_error_msg("M[%s]F[%s][%s][%s][%s][%s][%s]", mailTo, tokens[0], tokens[1], tokens[2], tokens[3], tokens[4], tokens[5]);
+ }
+ *pline = NULL;
- pline = &((*pline)->cl_Next);
- }
- *pline = NULL;
-
- file->cf_Next = FileBase;
- FileBase = file;
+ file->cf_next = G.cron_files;
+ G.cron_files = file;
- if (maxLines == 0 || maxEntries == 0) {
- crondlog("\111Maximum number of lines reached for user %s\n", fileName);
- }
- }
- fclose(fi);
+ if (maxLines == 0) {
+ crondlog(WARN9 "user %s: too many lines", fileName);
}
}
+ config_close(parser);
}
-static void CheckUpdates(void)
+static void process_cron_update_file(void)
{
FILE *fi;
char buf[256];
- fi = fopen(CRONUPDATE, "r");
+ fi = fopen_for_read(CRONUPDATE);
if (fi != NULL) {
- remove(CRONUPDATE);
+ unlink(CRONUPDATE);
while (fgets(buf, sizeof(buf), fi) != NULL) {
- SynchronizeFile(strtok(buf, " \t\r\n"));
+ /* use first word only */
+ skip_non_whitespace(buf)[0] = '\0';
+ load_crontab(buf);
}
fclose(fi);
}
}
-static void SynchronizeDir(void)
+static void rescan_crontab_dir(void)
{
- /* Attempt to delete the database. */
-
- for (;;) {
- CronFile *file;
+ CronFile *file;
- for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next);
- if (file == NULL) {
- break;
+ /* Delete all files until we only have ones with running jobs (or none) */
+ again:
+ for (file = G.cron_files; file; file = file->cf_next) {
+ if (!file->cf_deleted) {
+ delete_cronfile(file->cf_username);
+ goto again;
}
- 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("\311unable to find %s\n", CDir);
+ /* Remove cron update file */
+ unlink(CRONUPDATE);
+ /* Re-chdir, in case directory was renamed & deleted */
+ if (chdir(G.crontab_dir_name) < 0) {
+ crondlog(DIE9 "chdir(%s)", G.crontab_dir_name);
}
+
+ /* Scan directory and add associated users */
{
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);
- }
+ if (!dir)
+ crondlog(DIE9 "chdir(%s)", "."); /* exits */
+ while ((den = readdir(dir)) != NULL) {
+ if (strchr(den->d_name, '.') != NULL) {
+ continue;
}
- closedir(dir);
- } else {
- crondlog("\311Unable to open current dir!\n");
+ load_crontab(den->d_name);
}
+ closedir(dir);
}
}
-
-/*
- * 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)
+#if SETENV_LEAKS
+/* We set environment *before* vfork (because we want to use vfork),
+ * so we cannot use setenv() - repeated calls to setenv() may leak memory!
+ * Using putenv(), and freeing memory after unsetenv() won't leak */
+static void safe_setenv(char **pvar_val, const char *var, const char *val)
{
- CronFile **pfile = &FileBase;
- CronFile *file;
-
- while ((file = *pfile) != NULL) {
- if (strcmp(userName, file->cf_User) == 0) {
- CronLine **pline = &file->cf_LineBase;
- CronLine *line;
+ char *var_val = *pvar_val;
- 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;
- }
+ if (var_val) {
+ bb_unsetenv_and_free(var_val);
}
+ *pvar_val = xasprintf("%s=%s", var, val);
+ putenv(*pvar_val);
}
+#endif
-/*
- * 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)
+static void set_env_vars(struct passwd *pas)
{
- 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);
- }
+#if SETENV_LEAKS
+ safe_setenv(&G.env_var_user, "USER", pas->pw_name);
+ safe_setenv(&G.env_var_home, "HOME", pas->pw_dir);
+ /* if we want to set user's shell instead: */
+ /*safe_setenv(G.env_var_shell, "SHELL", pas->pw_shell);*/
+#else
+ xsetenv("USER", pas->pw_name);
+ xsetenv("HOME", pas->pw_dir);
#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);
+ /* currently, we use constant one: */
+ /*setenv("SHELL", DEFAULT_SHELL, 1); - done earlier */
}
-static void RunJobs(void)
+static void change_user(struct passwd *pas)
{
- 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;
- }
- }
- }
+ /* careful: we're after vfork! */
+ change_identity(pas); /* - initgroups, setgid, setuid */
+ if (chdir(pas->pw_dir) < 0) {
+ crondlog(WARN9 "chdir(%s)", pas->pw_dir);
+ if (chdir(TMPDIR) < 0) {
+ crondlog(DIE9 "chdir(%s)", TMPDIR); /* exits */
}
}
}
-/*
- * 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);
-}
+// TODO: sendmail should be _run-time_ option, not compile-time!
+#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
+static pid_t
+fork_job(const char *user, int mailFd,
+ const char *prog,
+ const char *shell_cmd /* if NULL, we run sendmail */
+) {
+ struct passwd *pas;
+ pid_t pid;
-#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();
+ /* prepare things before vfork */
+ pas = getpwnam(user);
+ if (!pas) {
+ crondlog(WARN9 "can't get uid for %s", user);
+ goto err;
+ }
+ set_env_vars(pas);
- line->cl_Pid = pid;
+ pid = vfork();
if (pid == 0) {
/* CHILD */
-
- /* Change running state to the user in question */
-
- if (ChangeUser(user) < 0) {
- exit(0);
- }
-#if ENABLE_DEBUG_CROND_OPTION
+ /* initgroups, setgid, setuid, and chdir to home or TMPDIR */
+ change_user(pas);
if (DebugOpt) {
- crondlog("\005Child Running %s\n", prog);
+ crondlog(LVL5 "child running %s", prog);
}
-#endif
-
if (mailFd >= 0) {
- dup2(mailFd, mailf != NULL);
- dup2((mailf ? mailFd : 1), 2);
- close(mailFd);
+ xmove_fd(mailFd, shell_cmd ? 1 : 0);
+ dup2(1, 2);
}
- execl(prog, prog, cmd, arg, NULL);
- crondlog("\024unable to exec, user %s cmd %s %s %s\n", user, prog, cmd, arg);
- if (mailf) {
- fdprintf(1, "Exec failed: %s -c %s\n", prog, arg);
+ /* crond 3.0pl1-100 puts tasks in separate process groups */
+ bb_setpgrp();
+ execlp(prog, prog, (shell_cmd ? "-c" : SENDMAIL_ARGS), shell_cmd, (char *) NULL);
+ crondlog(ERR20 "can't execute '%s' for user %s", prog, user);
+ if (shell_cmd) {
+ fdprintf(1, "Exec failed: %s -c %s\n", prog, shell_cmd);
}
- exit(0);
- } else if (pid < 0) {
+ _exit(EXIT_SUCCESS);
+ }
+
+ 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];
+ crondlog(ERR20 "can't vfork");
+ err:
+ pid = 0;
+ } /* else: PARENT, FORK SUCCESS */
- 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);
}
+ return pid;
}
-static void RunJob(const char *user, CronLine * line)
+static void start_one_job(const char *user, CronLine *line)
{
char mailFile[128];
- int mailFd;
+ int mailFd = -1;
- line->cl_Pid = 0;
- line->cl_MailFlag = 0;
+ line->cl_pid = 0;
+ line->cl_empty_mail_size = 0;
- /* open mail file - owner root so nobody can screw with it. */
+ if (line->cl_mailto) {
+ /* Open mail file (owner is root so nobody can screw with it) */
+ snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, getpid());
+ mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
- 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) {
+ fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", line->cl_mailto,
+ line->cl_cmd);
+ line->cl_empty_mail_size = lseek(mailFd, 0, SEEK_CUR);
+ } else {
+ crondlog(ERR20 "can't create mail file %s for user %s, "
+ "discarding output", mailFile, user);
+ }
+ }
+ line->cl_pid = fork_job(user, mailFd, DEFAULT_SHELL, line->cl_cmd);
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("\024unable to create mail file user %s file %s, output to /dev/null\n", user, mailFile);
+ if (line->cl_pid <= 0) {
+ unlink(mailFile);
+ } else {
+ /* rename mail-file based on pid of process */
+ char *mailFile2 = xasprintf("%s/cron.%s.%d", TMPDIR, user, (int)line->cl_pid);
+ rename(mailFile, mailFile2); // TODO: xrename?
+ free(mailFile2);
+ }
}
-
- ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
}
/*
- * EndJob - called when job terminates and when mail terminates
+ * process_finished_job - called when job terminates and when mail terminates
*/
-
-static void EndJob(const char *user, CronLine * line)
+static void process_finished_job(const char *user, CronLine *line)
{
+ pid_t pid;
int mailFd;
char mailFile[128];
struct stat sbuf;
- /* No job */
-
- if (line->cl_Pid <= 0) {
- line->cl_Pid = 0;
+ pid = line->cl_pid;
+ line->cl_pid = 0;
+ if (pid <= 0) {
+ /* No job */
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) {
+ if (line->cl_empty_mail_size <= 0) {
+ /* End of job and no mail file, or end of sendmail job */
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.
+ * End of primary job - check for mail file.
+ * If size has changed and the file is still valid, we send it.
*/
-
+ snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, (int)pid);
mailFd = open(mailFile, O_RDONLY);
- remove(mailFile);
+ unlink(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)) {
+ if (fstat(mailFd, &sbuf) < 0
+ || sbuf.st_uid != DAEMON_UID
+ || sbuf.st_nlink != 0
+ || sbuf.st_size == line->cl_empty_mail_size
+ || !S_ISREG(sbuf.st_mode)
+ ) {
close(mailFd);
return;
}
- ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
+ line->cl_empty_mail_size = 0;
+ /* if (line->cl_mailto) - always true if cl_empty_mail_size was nonzero */
+ line->cl_pid = fork_job(user, mailFd, SENDMAIL, NULL);
}
-#else
-/* crond without sendmail */
-static void RunJob(const char *user, CronLine * line)
+#else /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
+
+static void start_one_job(const char *user, CronLine *line)
{
- /* Fork as the user in question and run program */
- pid_t pid = fork();
+ struct passwd *pas;
+ pid_t pid;
+
+ pas = getpwnam(user);
+ if (!pas) {
+ crondlog(WARN9 "can't get uid for %s", user);
+ goto err;
+ }
+ /* Prepare things before vfork */
+ set_env_vars(pas);
+
+ /* Fork as the user in question and run program */
+ pid = vfork();
if (pid == 0) {
/* CHILD */
+ /* initgroups, setgid, setuid, and chdir to home or TMPDIR */
+ change_user(pas);
+ if (DebugOpt) {
+ crondlog(LVL5 "child running %s", DEFAULT_SHELL);
+ }
+ /* crond 3.0pl1-100 puts tasks in separate process groups */
+ bb_setpgrp();
+ execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_cmd, (char *) NULL);
+ crondlog(ERR20 "can't execute '%s' for user %s", DEFAULT_SHELL, user);
+ _exit(EXIT_SUCCESS);
+ }
+ if (pid < 0) {
+ /* FORK FAILED */
+ crondlog(ERR20 "can't vfork");
+ err:
+ pid = 0;
+ }
+ line->cl_pid = pid;
+}
- /* Change running state to the user in question */
+#define process_finished_job(user, line) ((line)->cl_pid = 0)
- if (ChangeUser(user) < 0) {
- exit(0);
+#endif /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
+
+/*
+ * 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 void flag_starting_jobs(time_t t1, time_t t2)
+{
+ time_t t;
+
+ /* Find jobs > t1 and <= t2 */
+
+ for (t = t1 - t1 % 60; t <= t2; t += 60) {
+ struct tm *ptm;
+ CronFile *file;
+ CronLine *line;
+
+ if (t <= t1)
+ continue;
+
+ ptm = localtime(&t);
+ for (file = G.cron_files; file; file = file->cf_next) {
+ if (DebugOpt)
+ crondlog(LVL5 "file %s:", file->cf_username);
+ if (file->cf_deleted)
+ continue;
+ for (line = file->cf_lines; line; line = line->cl_next) {
+ if (DebugOpt)
+ crondlog(LVL5 " line %s", line->cl_cmd);
+ if (line->cl_Mins[ptm->tm_min]
+ && line->cl_Hrs[ptm->tm_hour]
+ && (line->cl_Days[ptm->tm_mday] || line->cl_Dow[ptm->tm_wday])
+ && line->cl_Mons[ptm->tm_mon]
+ ) {
+ if (DebugOpt) {
+ crondlog(LVL5 " job: %d %s",
+ (int)line->cl_pid, line->cl_cmd);
+ }
+ if (line->cl_pid > 0) {
+ crondlog(LVL8 "user %s: process already running: %s",
+ file->cf_username, line->cl_cmd);
+ } else if (line->cl_pid == 0) {
+ line->cl_pid = -1;
+ file->cf_wants_starting = 1;
+ }
+ }
+ }
}
-#if ENABLE_DEBUG_CROND_OPTION
- if (DebugOpt) {
- crondlog("\005Child Running %s\n", DEFAULT_SHELL);
+ }
+}
+
+static void start_jobs(void)
+{
+ CronFile *file;
+ CronLine *line;
+
+ for (file = G.cron_files; file; file = file->cf_next) {
+ if (!file->cf_wants_starting)
+ continue;
+
+ file->cf_wants_starting = 0;
+ for (line = file->cf_lines; line; line = line->cl_next) {
+ pid_t pid;
+ if (line->cl_pid >= 0)
+ continue;
+
+ start_one_job(file->cf_username, line);
+ pid = line->cl_pid;
+ crondlog(LVL8 "USER %s pid %3d cmd %s",
+ file->cf_username, (int)pid, line->cl_cmd);
+ if (pid < 0) {
+ file->cf_wants_starting = 1;
+ }
+ if (pid > 0) {
+ file->cf_has_running = 1;
+ }
}
-#endif
+ }
+}
- execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_Shell, NULL);
- crondlog("\024unable to 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;
+/*
+ * Check for job completion, return number of jobs still running after
+ * all done.
+ */
+static int check_completions(void)
+{
+ CronFile *file;
+ CronLine *line;
+ int num_still_running = 0;
+
+ for (file = G.cron_files; file; file = file->cf_next) {
+ if (!file->cf_has_running)
+ continue;
+
+ file->cf_has_running = 0;
+ for (line = file->cf_lines; line; line = line->cl_next) {
+ int r;
+
+ if (line->cl_pid <= 0)
+ continue;
+
+ r = waitpid(line->cl_pid, NULL, WNOHANG);
+ if (r < 0 || r == line->cl_pid) {
+ process_finished_job(file->cf_username, line);
+ if (line->cl_pid == 0) {
+ /* sendmail was not started for it */
+ continue;
+ }
+ /* else: sendmail was started, job is still running, fall thru */
+ }
+ /* else: r == 0: "process is still running" */
+ file->cf_has_running = 1;
+ }
+//FIXME: if !file->cf_has_running && file->deleted: delete it!
+//otherwise deleted entries will stay forever, right?
+ num_still_running += file->cf_has_running;
+ }
+ return num_still_running;
+}
+
+int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int crond_main(int argc UNUSED_PARAM, char **argv)
+{
+ time_t t2;
+ int rescan;
+ int sleep_time;
+ unsigned opts;
+
+ INIT_G();
+
+ /* "-b after -f is ignored", and so on for every pair a-b */
+ opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
+ /* -l and -d have numeric param */
+ ":l+" IF_FEATURE_CROND_D(":d+");
+ opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
+ &G.log_level, &G.log_filename, &G.crontab_dir_name
+ IF_FEATURE_CROND_D(,&G.log_level));
+ /* both -d N and -l N set the same variable: G.log_level */
+
+ if (!(opts & OPT_f)) {
+ /* close stdin, stdout, stderr.
+ * close unused descriptors - don't need them. */
+ bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
+ }
+
+ if (!(opts & OPT_d) && G.log_filename == NULL) {
+ /* logging to syslog */
+ openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
+ logmode = LOGMODE_SYSLOG;
}
- line->cl_Pid = pid;
+
+ xchdir(G.crontab_dir_name);
+ //signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
+ xsetenv("SHELL", DEFAULT_SHELL); /* once, for all future children */
+ crondlog(LVL8 "crond (busybox "BB_VER") started, log level %d", G.log_level);
+ rescan_crontab_dir();
+ write_pidfile(CONFIG_PID_FILE_PATH "/crond.pid");
+
+ /* Main loop */
+ t2 = time(NULL);
+ rescan = 60;
+ sleep_time = 60;
+ for (;;) {
+ struct stat sbuf;
+ time_t t1;
+ long dt;
+
+ t1 = t2;
+
+ /* Synchronize to 1 minute, minimum 1 second */
+ sleep(sleep_time - (time(NULL) % sleep_time) + 1);
+
+ t2 = time(NULL);
+ dt = (long)t2 - (long)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 time jump. Disparities over an hour either way
+ * result in resynchronization. A negative disparity
+ * less than 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 positive disparity less than
+ * 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 (stat(G.crontab_dir_name, &sbuf) != 0)
+ sbuf.st_mtime = 0; /* force update (once) if dir was deleted */
+ if (G.crontab_dir_mtime != sbuf.st_mtime) {
+ G.crontab_dir_mtime = sbuf.st_mtime;
+ rescan = 1;
+ }
+ if (--rescan == 0) {
+ rescan = 60;
+ rescan_crontab_dir();
+ }
+ process_cron_update_file();
+ if (DebugOpt)
+ crondlog(LVL5 "wakeup dt=%ld", dt);
+ if (dt < -60 * 60 || dt > 60 * 60) {
+ crondlog(WARN9 "time disparity of %ld minutes detected", dt / 60);
+ /* and we do not run any jobs in this case */
+ } else if (dt > 0) {
+ /* Usual case: time advances forward, as expected */
+ flag_starting_jobs(t1, t2);
+ start_jobs();
+ if (check_completions() > 0) {
+ /* some jobs are still running */
+ sleep_time = 10;
+ } else {
+ sleep_time = 60;
+ }
+ }
+ /* else: time jumped back, do not run any jobs */
+ } /* for (;;) */
+
+ return 0; /* not reached */
}
-#endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */
projects / platform / upstream / busybox.git / blobdiff