mirror of
https://github.com/sheumann/hush.git
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crond: rename HumpBack names. Note two TODOs/FIXMEs
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
dfc870fab7
commit
45963c873c
@ -40,33 +40,33 @@
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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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smallint cf_Ready; /* bool: one or more jobs ready */
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smallint cf_Running; /* bool: one or more jobs running */
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smallint cf_Deleted; /* marked for deletion, ignore */
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struct CronFile *cf_next;
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struct CronLine *cf_lines;
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char *cf_username;
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smallint cf_wants_starting; /* bool: one or more jobs ready */
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smallint cf_has_running; /* bool: one or more jobs running */
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smallint cf_deleted; /* marked for deletion (but still has running jobs) */
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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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struct CronLine *cl_next;
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char *cl_cmd; /* shell command */
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pid_t cl_pid; /* >0:running, <0:needs to be started in this minute, 0:dormant */
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#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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int cl_MailPos; /* 'empty file' size */
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char *cl_MailTo; /* whom to mail results */
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smallint cl_MailFlag; /* running pid is for mail */
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int cl_empty_mail_size; /* size of mail header only */
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char *cl_mailto; /* whom to mail results, may be NULL */
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smallint cl_mail_result; /* mail file is created, need to send it on completion */
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#endif
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/* ordered by size, not in natural order. makes code smaller: */
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char cl_Dow[7]; /* 0-6, beginning sunday */
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char cl_Mons[12]; /* 0-11 */
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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_Mins[60]; /* 0-59 */
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char cl_Dow[7]; /* 0-6, beginning sunday */
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char cl_Mons[12]; /* 0-11 */
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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_Mins[60]; /* 0-59 */
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} CronLine;
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#define DaemonUid 0
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#define DAEMON_UID 0
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enum {
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@ -79,18 +79,18 @@ enum {
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OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D,
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};
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#if ENABLE_FEATURE_CROND_D
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#define DebugOpt (option_mask32 & OPT_d)
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# define DebugOpt (option_mask32 & OPT_d)
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#else
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#define DebugOpt 0
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# define DebugOpt 0
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#endif
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struct globals {
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unsigned LogLevel; /* = 8; */
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time_t CDir_mtime;
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const char *LogFile;
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const char *CDir; /* = CRONTABS; */
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CronFile *FileBase;
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unsigned log_level; /* = 8; */
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time_t crontab_dir_mtime;
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const char *log_filename;
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const char *crontab_dir_name; /* = CRONTABS; */
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CronFile *cron_files;
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#if SETENV_LEAKS
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char *env_var_user;
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char *env_var_home;
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@ -98,8 +98,8 @@ struct globals {
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() do { \
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G.LogLevel = 8; \
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G.CDir = CRONTABS; \
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G.log_level = 8; \
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G.crontab_dir_name = CRONTABS; \
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} while (0)
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@ -119,12 +119,12 @@ static void crondlog(const char *ctl, ...)
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int level = (ctl[0] & 0x1f);
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va_start(va, ctl);
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if (level >= (int)G.LogLevel) {
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if (level >= (int)G.log_level) {
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/* Debug mode: all to (non-redirected) stderr, */
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/* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
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if (!DebugOpt && G.LogFile) {
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if (!DebugOpt && G.log_filename) {
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/* Otherwise (log to file): we reopen log file at every write: */
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int logfd = open3_or_warn(G.LogFile, O_WRONLY | O_CREAT | O_APPEND, 0666);
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int logfd = open3_or_warn(G.log_filename, O_WRONLY | O_CREAT | O_APPEND, 0666);
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if (logfd >= 0)
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xmove_fd(logfd, STDERR_FILENO);
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}
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@ -144,49 +144,6 @@ static void crondlog(const char *ctl, ...)
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exit(20);
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}
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#if SETENV_LEAKS
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/* We set environment *before* vfork (because we want to use vfork),
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* so we cannot use setenv() - repeated calls to setenv() may leak memory!
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* Using putenv(), and freeing memory after unsetenv() won't leak */
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static void safe_setenv(char **pvar_val, const char *var, const char *val)
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{
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char *var_val = *pvar_val;
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if (var_val) {
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bb_unsetenv_and_free(var_val);
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}
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*pvar_val = xasprintf("%s=%s", var, val);
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putenv(*pvar_val);
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}
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#endif
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static void SetEnv(struct passwd *pas)
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{
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#if SETENV_LEAKS
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safe_setenv(&G.env_var_user, "USER", pas->pw_name);
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safe_setenv(&G.env_var_home, "HOME", pas->pw_dir);
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/* if we want to set user's shell instead: */
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/*safe_setenv(G.env_var_shell, "SHELL", pas->pw_shell);*/
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#else
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xsetenv("USER", pas->pw_name);
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xsetenv("HOME", pas->pw_dir);
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#endif
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/* currently, we use constant one: */
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/*setenv("SHELL", DEFAULT_SHELL, 1); - done earlier */
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}
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static void ChangeUser(struct passwd *pas)
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{
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/* careful: we're after vfork! */
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change_identity(pas); /* - initgroups, setgid, setuid */
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if (chdir(pas->pw_dir) < 0) {
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crondlog(WARN9 "chdir(%s)", pas->pw_dir);
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if (chdir(TMPDIR) < 0) {
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crondlog(DIE9 "chdir(%s)", TMPDIR); /* exits */
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}
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}
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}
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static const char DowAry[] ALIGN1 =
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"sun""mon""tue""wed""thu""fri""sat"
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/* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
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@ -303,7 +260,7 @@ static void ParseField(char *user, char *ary, int modvalue, int off,
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return;
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}
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if (DebugOpt && (G.LogLevel <= 5)) { /* like LVL5 */
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if (DebugOpt && (G.log_level <= 5)) { /* like LVL5 */
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/* can't use crondlog, it inserts '\n' */
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int i;
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for (i = 0; i < modvalue; ++i)
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@ -339,48 +296,57 @@ static void FixDayDow(CronLine *line)
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}
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/*
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* DeleteFile() - delete user database
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* delete_cronfile() - delete user database
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*
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* Note: multiple entries for same user may exist if we were unable to
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* completely delete a database due to running processes.
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*/
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static void DeleteFile(const char *userName)
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//FIXME: we will start a new job even if the old job is running
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//if crontab was reloaded: crond thinks that "new" job is different from "old"
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//even if they are in fact completely the same. Example
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//Crontab was:
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// 0-59 * * * job1
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// 0-59 * * * long_running_job2
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//User edits crontab to:
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// 0-59 * * * job1_updated
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// 0-59 * * * long_running_job2
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//Bug: crond can now start another long_running_job2 even if old one
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//is still running.
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static void delete_cronfile(const char *userName)
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{
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CronFile **pfile = &G.FileBase;
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CronFile **pfile = &G.cron_files;
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CronFile *file;
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while ((file = *pfile) != NULL) {
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if (strcmp(userName, file->cf_User) == 0) {
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CronLine **pline = &file->cf_LineBase;
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if (strcmp(userName, file->cf_username) == 0) {
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CronLine **pline = &file->cf_lines;
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CronLine *line;
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file->cf_Running = 0;
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file->cf_Deleted = 1;
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file->cf_has_running = 0;
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file->cf_deleted = 1;
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while ((line = *pline) != NULL) {
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if (line->cl_Pid > 0) {
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file->cf_Running = 1;
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pline = &line->cl_Next;
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if (line->cl_pid > 0) {
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file->cf_has_running = 1;
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pline = &line->cl_next;
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} else {
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*pline = line->cl_Next;
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free(line->cl_Shell);
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*pline = line->cl_next;
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free(line->cl_cmd);
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free(line);
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}
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}
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if (file->cf_Running == 0) {
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*pfile = file->cf_Next;
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free(file->cf_User);
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if (file->cf_has_running == 0) {
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*pfile = file->cf_next;
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free(file->cf_username);
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free(file);
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} else {
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pfile = &file->cf_Next;
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continue;
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}
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} else {
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pfile = &file->cf_Next;
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}
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pfile = &file->cf_next;
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}
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}
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static void SynchronizeFile(const char *fileName)
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static void load_crontab(const char *fileName)
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{
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struct parser_t *parser;
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struct stat sbuf;
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@ -390,23 +356,26 @@ static void SynchronizeFile(const char *fileName)
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char *mailTo = NULL;
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#endif
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if (!fileName)
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return;
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delete_cronfile(fileName);
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if (!getpwnam(fileName)) {
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crondlog(LVL7 "ignoring file '%s' (no such user)", fileName);
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return;
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}
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DeleteFile(fileName);
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parser = config_open(fileName);
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if (!parser)
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return;
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maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES;
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if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
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if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DAEMON_UID) {
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CronFile *file = xzalloc(sizeof(CronFile));
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CronLine **pline;
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int n;
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file->cf_User = xstrdup(fileName);
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pline = &file->cf_LineBase;
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file->cf_username = xstrdup(fileName);
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pline = &file->cf_lines;
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while (1) {
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CronLine *line;
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@ -433,11 +402,11 @@ static void SynchronizeFile(const char *fileName)
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continue;
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*pline = line = xzalloc(sizeof(*line));
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/* parse date ranges */
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ParseField(file->cf_User, line->cl_Mins, 60, 0, NULL, tokens[0]);
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ParseField(file->cf_User, line->cl_Hrs, 24, 0, NULL, tokens[1]);
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ParseField(file->cf_User, line->cl_Days, 32, 0, NULL, tokens[2]);
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ParseField(file->cf_User, line->cl_Mons, 12, -1, MonAry, tokens[3]);
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ParseField(file->cf_User, line->cl_Dow, 7, 0, DowAry, tokens[4]);
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ParseField(file->cf_username, line->cl_Mins, 60, 0, NULL, tokens[0]);
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ParseField(file->cf_username, line->cl_Hrs, 24, 0, NULL, tokens[1]);
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ParseField(file->cf_username, line->cl_Days, 32, 0, NULL, tokens[2]);
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ParseField(file->cf_username, line->cl_Mons, 12, -1, MonAry, tokens[3]);
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ParseField(file->cf_username, line->cl_Dow, 7, 0, DowAry, tokens[4]);
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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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@ -445,20 +414,20 @@ static void SynchronizeFile(const char *fileName)
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FixDayDow(line);
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#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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/* copy mailto (can be NULL) */
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line->cl_MailTo = xstrdup(mailTo);
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line->cl_mailto = xstrdup(mailTo);
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#endif
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/* copy command */
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line->cl_Shell = xstrdup(tokens[5]);
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line->cl_cmd = xstrdup(tokens[5]);
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if (DebugOpt) {
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crondlog(LVL5 " command:%s", tokens[5]);
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}
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pline = &line->cl_Next;
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pline = &line->cl_next;
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//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]);
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}
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*pline = NULL;
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file->cf_Next = G.FileBase;
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G.FileBase = file;
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file->cf_next = G.cron_files;
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G.cron_files = file;
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if (maxLines == 0) {
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crondlog(WARN9 "user %s: too many lines", fileName);
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@ -467,7 +436,7 @@ static void SynchronizeFile(const char *fileName)
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config_close(parser);
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}
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static void CheckUpdates(void)
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static void process_cron_update_file(void)
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{
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FILE *fi;
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char buf[256];
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@ -477,36 +446,34 @@ static void CheckUpdates(void)
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unlink(CRONUPDATE);
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while (fgets(buf, sizeof(buf), fi) != NULL) {
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/* use first word only */
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SynchronizeFile(strtok(buf, " \t\r\n"));
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skip_non_whitespace(buf)[0] = '\0';
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load_crontab(buf);
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}
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fclose(fi);
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}
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}
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static void SynchronizeDir(void)
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static void rescan_crontab_dir(void)
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{
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CronFile *file;
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/* Attempt to delete the database. */
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/* Delete all files until we only have ones with running jobs (or none) */
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again:
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for (file = G.FileBase; file; file = file->cf_Next) {
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if (!file->cf_Deleted) {
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DeleteFile(file->cf_User);
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for (file = G.cron_files; file; file = file->cf_next) {
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if (!file->cf_deleted) {
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delete_cronfile(file->cf_username);
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goto again;
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}
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}
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/*
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* Remove cron update file
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*
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* Re-chdir, in case directory was renamed & deleted, or otherwise
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* screwed up.
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*
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* scan directory and add associated users
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*/
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/* Remove cron update file */
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unlink(CRONUPDATE);
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if (chdir(G.CDir) < 0) {
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crondlog(DIE9 "chdir(%s)", G.CDir);
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/* Re-chdir, in case directory was renamed & deleted */
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if (chdir(G.crontab_dir_name) < 0) {
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crondlog(DIE9 "chdir(%s)", G.crontab_dir_name);
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}
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/* Scan directory and add associated users */
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{
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DIR *dir = opendir(".");
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struct dirent *den;
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@ -517,162 +484,62 @@ static void SynchronizeDir(void)
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if (strchr(den->d_name, '.') != NULL) {
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continue;
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}
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if (getpwnam(den->d_name)) {
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SynchronizeFile(den->d_name);
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} else {
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crondlog(LVL7 "ignoring %s", den->d_name);
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}
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load_crontab(den->d_name);
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}
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closedir(dir);
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}
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}
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/*
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* Determine which jobs need to be run. Under normal conditions, the
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* period is about a minute (one scan). Worst case it will be one
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* hour (60 scans).
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*/
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static void TestJobs(time_t t1, time_t t2)
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#if SETENV_LEAKS
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/* We set environment *before* vfork (because we want to use vfork),
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* so we cannot use setenv() - repeated calls to setenv() may leak memory!
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* Using putenv(), and freeing memory after unsetenv() won't leak */
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static void safe_setenv(char **pvar_val, const char *var, const char *val)
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{
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time_t t;
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char *var_val = *pvar_val;
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/* Find jobs > t1 and <= t2 */
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for (t = t1 - t1 % 60; t <= t2; t += 60) {
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struct tm *ptm;
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CronFile *file;
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CronLine *line;
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if (t <= t1)
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continue;
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ptm = localtime(&t);
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for (file = G.FileBase; file; file = file->cf_Next) {
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if (DebugOpt)
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crondlog(LVL5 "file %s:", file->cf_User);
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if (file->cf_Deleted)
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continue;
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for (line = file->cf_LineBase; line; line = line->cl_Next) {
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if (DebugOpt)
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crondlog(LVL5 " line %s", line->cl_Shell);
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if (line->cl_Mins[ptm->tm_min] && line->cl_Hrs[ptm->tm_hour]
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&& (line->cl_Days[ptm->tm_mday] || line->cl_Dow[ptm->tm_wday])
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&& line->cl_Mons[ptm->tm_mon]
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) {
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if (DebugOpt) {
|
||||
crondlog(LVL5 " job: %d %s",
|
||||
(int)line->cl_Pid, line->cl_Shell);
|
||||
}
|
||||
if (line->cl_Pid > 0) {
|
||||
crondlog(LVL8 "user %s: process already running: %s",
|
||||
file->cf_User, line->cl_Shell);
|
||||
} else if (line->cl_Pid == 0) {
|
||||
line->cl_Pid = -1;
|
||||
file->cf_Ready = 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
if (var_val) {
|
||||
bb_unsetenv_and_free(var_val);
|
||||
}
|
||||
*pvar_val = xasprintf("%s=%s", var, val);
|
||||
putenv(*pvar_val);
|
||||
}
|
||||
|
||||
#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 *mail_filename);
|
||||
/*
|
||||
* 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), "%s/cron.%s.%d", TMPDIR, user, line->cl_Pid);
|
||||
line->cl_Pid = 0;
|
||||
|
||||
if (line->cl_MailFlag == 0) {
|
||||
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);
|
||||
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)
|
||||
) {
|
||||
close(mailFd);
|
||||
return;
|
||||
}
|
||||
if (line->cl_MailTo)
|
||||
ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
|
||||
}
|
||||
#else
|
||||
# define EndJob(user, line) ((line)->cl_Pid = 0)
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Check for job completion, return number of jobs still running after
|
||||
* all done.
|
||||
*/
|
||||
static int CheckJobs(void)
|
||||
static void set_env_vars(struct passwd *pas)
|
||||
{
|
||||
CronFile *file;
|
||||
CronLine *line;
|
||||
int nStillRunning = 0;
|
||||
|
||||
for (file = G.FileBase; file; file = file->cf_Next) {
|
||||
if (file->cf_Running) {
|
||||
file->cf_Running = 0;
|
||||
|
||||
for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
||||
int status, r;
|
||||
if (line->cl_Pid <= 0)
|
||||
continue;
|
||||
|
||||
r = waitpid(line->cl_Pid, &status, WNOHANG);
|
||||
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 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
|
||||
/* currently, we use constant one: */
|
||||
/*setenv("SHELL", DEFAULT_SHELL, 1); - done earlier */
|
||||
}
|
||||
|
||||
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
||||
static void change_user(struct passwd *pas)
|
||||
{
|
||||
/* 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 */
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// TODO: sendmail should be _run-time_ option, not compile-time!
|
||||
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
||||
|
||||
//TODO: return pid (and stop passing line);
|
||||
// stop passing mail_filename here but process it in caller
|
||||
static void
|
||||
ForkJob(const char *user, CronLine *line, int mailFd,
|
||||
fork_job(const char *user, CronLine *line, int mailFd,
|
||||
const char *prog, const char *cmd, const char *arg,
|
||||
const char *mail_filename)
|
||||
{
|
||||
@ -685,13 +552,13 @@ ForkJob(const char *user, CronLine *line, int mailFd,
|
||||
crondlog(WARN9 "can't get uid for %s", user);
|
||||
goto err;
|
||||
}
|
||||
SetEnv(pas);
|
||||
set_env_vars(pas);
|
||||
|
||||
pid = vfork();
|
||||
if (pid == 0) {
|
||||
/* CHILD */
|
||||
/* change running state to the user in question */
|
||||
ChangeUser(pas);
|
||||
/* initgroups, setgid, setuid, and chdir to home or TMPDIR */
|
||||
change_user(pas);
|
||||
if (DebugOpt) {
|
||||
crondlog(LVL5 "child running %s", prog);
|
||||
}
|
||||
@ -709,12 +576,12 @@ ForkJob(const char *user, CronLine *line, int mailFd,
|
||||
_exit(EXIT_SUCCESS);
|
||||
}
|
||||
|
||||
line->cl_Pid = pid;
|
||||
line->cl_pid = pid;
|
||||
if (pid < 0) {
|
||||
/* FORK FAILED */
|
||||
crondlog(ERR20 "can't vfork");
|
||||
err:
|
||||
line->cl_Pid = 0;
|
||||
line->cl_pid = 0;
|
||||
if (mail_filename) {
|
||||
unlink(mail_filename);
|
||||
}
|
||||
@ -737,62 +604,108 @@ ForkJob(const char *user, CronLine *line, int mailFd,
|
||||
}
|
||||
}
|
||||
|
||||
static void RunJob(const char *user, CronLine *line)
|
||||
static void start_one_job(const char *user, CronLine *line)
|
||||
{
|
||||
char mailFile[128];
|
||||
int mailFd = -1;
|
||||
|
||||
line->cl_Pid = 0;
|
||||
line->cl_MailFlag = 0;
|
||||
line->cl_pid = 0;
|
||||
line->cl_mail_result = 0;
|
||||
|
||||
if (line->cl_MailTo) {
|
||||
/* 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);
|
||||
|
||||
if (mailFd >= 0) {
|
||||
line->cl_MailFlag = 1;
|
||||
fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", line->cl_MailTo,
|
||||
line->cl_Shell);
|
||||
line->cl_MailPos = lseek(mailFd, 0, SEEK_CUR);
|
||||
line->cl_mail_result = 1;
|
||||
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);
|
||||
}
|
||||
}
|
||||
|
||||
ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
|
||||
fork_job(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_cmd, mailFile);
|
||||
}
|
||||
|
||||
/*
|
||||
* process_finished_job - called when job terminates and when mail terminates
|
||||
*/
|
||||
static void process_finished_job(const char *user, CronLine *line)
|
||||
{
|
||||
pid_t pid;
|
||||
int mailFd;
|
||||
char mailFile[128];
|
||||
struct stat sbuf;
|
||||
|
||||
pid = line->cl_pid;
|
||||
line->cl_pid = 0;
|
||||
if (pid <= 0) {
|
||||
/* No job */
|
||||
return;
|
||||
}
|
||||
if (line->cl_mail_result == 0) {
|
||||
/* End of job and no mail file, or end of sendmail job */
|
||||
return;
|
||||
}
|
||||
line->cl_mail_result = 0;
|
||||
|
||||
/*
|
||||
* 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);
|
||||
unlink(mailFile);
|
||||
if (mailFd < 0) {
|
||||
return;
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
/* if (line->cl_mailto) - always true if cl_mail_result was true */
|
||||
fork_job(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
|
||||
}
|
||||
|
||||
#else /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
||||
|
||||
static void RunJob(const char *user, CronLine *line)
|
||||
static void start_one_job(const char *user, CronLine *line)
|
||||
{
|
||||
struct passwd *pas;
|
||||
pid_t pid;
|
||||
|
||||
/* prepare things before vfork */
|
||||
pas = getpwnam(user);
|
||||
if (!pas) {
|
||||
crondlog(WARN9 "can't get uid for %s", user);
|
||||
goto err;
|
||||
}
|
||||
SetEnv(pas);
|
||||
|
||||
/* fork as the user in question and run program */
|
||||
/* Prepare things before vfork */
|
||||
set_env_vars(pas);
|
||||
|
||||
/* Fork as the user in question and run program */
|
||||
pid = vfork();
|
||||
if (pid == 0) {
|
||||
/* CHILD */
|
||||
/* change running state to the user in question */
|
||||
ChangeUser(pas);
|
||||
/* 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_Shell, (char *) NULL);
|
||||
crondlog(ERR20 "can't exec, user %s cmd %s %s %s", user,
|
||||
DEFAULT_SHELL, "-c", line->cl_Shell);
|
||||
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) {
|
||||
@ -801,37 +714,132 @@ static void RunJob(const char *user, CronLine *line)
|
||||
err:
|
||||
pid = 0;
|
||||
}
|
||||
line->cl_Pid = pid;
|
||||
line->cl_pid = pid;
|
||||
}
|
||||
|
||||
#define process_finished_job(user, line) ((line)->cl_pid = 0)
|
||||
|
||||
#endif /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
||||
|
||||
static void RunJobs(void)
|
||||
/*
|
||||
* 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;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void start_jobs(void)
|
||||
{
|
||||
CronFile *file;
|
||||
CronLine *line;
|
||||
|
||||
for (file = G.FileBase; file; file = file->cf_Next) {
|
||||
if (!file->cf_Ready)
|
||||
for (file = G.cron_files; file; file = file->cf_next) {
|
||||
if (!file->cf_wants_starting)
|
||||
continue;
|
||||
|
||||
file->cf_Ready = 0;
|
||||
for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
||||
if (line->cl_Pid >= 0)
|
||||
file->cf_wants_starting = 0;
|
||||
for (line = file->cf_lines; line; line = line->cl_next) {
|
||||
pid_t pid;
|
||||
if (line->cl_pid >= 0)
|
||||
continue;
|
||||
|
||||
RunJob(file->cf_User, line);
|
||||
start_one_job(file->cf_username, line);
|
||||
pid = line->cl_pid;
|
||||
crondlog(LVL8 "USER %s pid %3d cmd %s",
|
||||
file->cf_User, (int)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;
|
||||
file->cf_username, (int)pid, line->cl_cmd);
|
||||
if (pid < 0) {
|
||||
file->cf_wants_starting = 1;
|
||||
}
|
||||
if (pid > 0) {
|
||||
file->cf_has_running = 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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)
|
||||
{
|
||||
@ -846,9 +854,9 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
|
||||
opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
|
||||
":l+:d+"; /* -l and -d have numeric param */
|
||||
opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
|
||||
&G.LogLevel, &G.LogFile, &G.CDir
|
||||
IF_FEATURE_CROND_D(,&G.LogLevel));
|
||||
/* both -d N and -l N set the same variable: G.LogLevel */
|
||||
&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.
|
||||
@ -856,17 +864,17 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
|
||||
bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
|
||||
}
|
||||
|
||||
if (!(opts & OPT_d) && G.LogFile == NULL) {
|
||||
if (!(opts & OPT_d) && G.log_filename == NULL) {
|
||||
/* logging to syslog */
|
||||
openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
|
||||
logmode = LOGMODE_SYSLOG;
|
||||
}
|
||||
|
||||
xchdir(G.CDir);
|
||||
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.LogLevel);
|
||||
SynchronizeDir();
|
||||
crondlog(LVL8 "crond (busybox "BB_VER") started, log level %d", G.log_level);
|
||||
rescan_crontab_dir();
|
||||
write_pidfile("/var/run/crond.pid");
|
||||
|
||||
/* Main loop */
|
||||
@ -902,15 +910,17 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
|
||||
* When running jobs, the inequality used is greater but not
|
||||
* equal to t1, and less then or equal to t2.
|
||||
*/
|
||||
if (stat(G.CDir, &sbuf) == 0 && G.CDir_mtime != sbuf.st_mtime) {
|
||||
G.CDir_mtime = sbuf.st_mtime;
|
||||
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;
|
||||
SynchronizeDir();
|
||||
rescan_crontab_dir();
|
||||
}
|
||||
CheckUpdates();
|
||||
process_cron_update_file();
|
||||
if (DebugOpt)
|
||||
crondlog(LVL5 "wakeup dt=%ld", dt);
|
||||
if (dt < -60 * 60 || dt > 60 * 60) {
|
||||
@ -918,9 +928,10 @@ int crond_main(int argc UNUSED_PARAM, char **argv)
|
||||
/* and we do not run any jobs in this case */
|
||||
} else if (dt > 0) {
|
||||
/* Usual case: time advances forward, as expected */
|
||||
TestJobs(t1, t2);
|
||||
RunJobs();
|
||||
if (CheckJobs() > 0) {
|
||||
flag_starting_jobs(t1, t2);
|
||||
start_jobs();
|
||||
if (check_completions() > 0) {
|
||||
/* some jobs are still running */
|
||||
sleep_time = 10;
|
||||
} else {
|
||||
sleep_time = 60;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user