diff options
| -rw-r--r-- | miscutils/crond.c | 633 |
1 files changed, 322 insertions, 311 deletions
diff --git a/miscutils/crond.c b/miscutils/crond.c index 481830f..2872256 100644 --- a/miscutils/crond.c +++ b/miscutils/crond.c @@ -40,33 +40,33 @@ typedef struct CronFile { - struct CronFile *cf_Next; - struct CronLine *cf_LineBase; - char *cf_User; /* username */ - smallint cf_Ready; /* bool: one or more jobs ready */ - smallint cf_Running; /* bool: one or more jobs running */ - smallint 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) */ + 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_MailPos; /* 'empty file' size */ - char *cl_MailTo; /* whom to mail results */ - smallint cl_MailFlag; /* running pid is for mail */ + int cl_empty_mail_size; /* size of mail header only */ + char *cl_mailto; /* whom to mail results, may be NULL */ + smallint cl_mail_result; /* mail file is created, need to send it on completion */ #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 */ + 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; -#define DaemonUid 0 +#define DAEMON_UID 0 enum { @@ -79,18 +79,18 @@ enum { OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D, }; #if ENABLE_FEATURE_CROND_D -#define DebugOpt (option_mask32 & OPT_d) +# define DebugOpt (option_mask32 & OPT_d) #else -#define DebugOpt 0 +# define DebugOpt 0 #endif struct globals { - unsigned LogLevel; /* = 8; */ - time_t CDir_mtime; - const char *LogFile; - const char *CDir; /* = CRONTABS; */ - CronFile *FileBase; + 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; @@ -98,8 +98,8 @@ struct globals { } FIX_ALIASING; #define G (*(struct globals*)&bb_common_bufsiz1) #define INIT_G() do { \ - G.LogLevel = 8; \ - G.CDir = CRONTABS; \ + G.log_level = 8; \ + G.crontab_dir_name = CRONTABS; \ } while (0) @@ -119,12 +119,12 @@ static void crondlog(const char *ctl, ...) int level = (ctl[0] & 0x1f); va_start(va, ctl); - if (level >= (int)G.LogLevel) { + if (level >= (int)G.log_level) { /* Debug mode: all to (non-redirected) stderr, */ /* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */ - if (!DebugOpt && G.LogFile) { + if (!DebugOpt && G.log_filename) { /* Otherwise (log to file): we reopen log file at every write: */ - int logfd = open3_or_warn(G.LogFile, O_WRONLY | O_CREAT | O_APPEND, 0666); + int logfd = open3_or_warn(G.log_filename, O_WRONLY | O_CREAT | O_APPEND, 0666); if (logfd >= 0) xmove_fd(logfd, STDERR_FILENO); } @@ -144,49 +144,6 @@ static void crondlog(const char *ctl, ...) exit(20); } -#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) -{ - char *var_val = *pvar_val; - - if (var_val) { - bb_unsetenv_and_free(var_val); - } - *pvar_val = xasprintf("%s=%s", var, val); - putenv(*pvar_val); -} -#endif - -static void SetEnv(struct passwd *pas) -{ -#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 */ -} - -static void ChangeUser(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 */ - } - } -} - static const char DowAry[] ALIGN1 = "sun""mon""tue""wed""thu""fri""sat" /* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */ @@ -303,7 +260,7 @@ static void ParseField(char *user, char *ary, int modvalue, int off, return; } - if (DebugOpt && (G.LogLevel <= 5)) { /* like LVL5 */ + if (DebugOpt && (G.log_level <= 5)) { /* like LVL5 */ /* can't use crondlog, it inserts '\n' */ int i; for (i = 0; i < modvalue; ++i) @@ -339,48 +296,57 @@ static void FixDayDow(CronLine *line) } /* - * DeleteFile() - delete user database + * 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. */ -static void DeleteFile(const char *userName) +//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. +static void delete_cronfile(const char *userName) { - CronFile **pfile = &G.FileBase; + CronFile **pfile = &G.cron_files; CronFile *file; while ((file = *pfile) != NULL) { - if (strcmp(userName, file->cf_User) == 0) { - CronLine **pline = &file->cf_LineBase; + if (strcmp(userName, file->cf_username) == 0) { + CronLine **pline = &file->cf_lines; CronLine *line; - file->cf_Running = 0; - file->cf_Deleted = 1; + file->cf_has_running = 0; + file->cf_deleted = 1; while ((line = *pline) != NULL) { - if (line->cl_Pid > 0) { - file->cf_Running = 1; - pline = &line->cl_Next; + if (line->cl_pid > 0) { + file->cf_has_running = 1; + pline = &line->cl_next; } else { - *pline = line->cl_Next; - free(line->cl_Shell); + *pline = line->cl_next; + free(line->cl_cmd); free(line); } } - if (file->cf_Running == 0) { - *pfile = file->cf_Next; - free(file->cf_User); + if (file->cf_has_running == 0) { + *pfile = file->cf_next; + free(file->cf_username); free(file); - } else { - pfile = &file->cf_Next; + continue; } - } else { - pfile = &file->cf_Next; } + pfile = &file->cf_next; } } -static void SynchronizeFile(const char *fileName) +static void load_crontab(const char *fileName) { struct parser_t *parser; struct stat sbuf; @@ -390,23 +356,26 @@ static void SynchronizeFile(const char *fileName) char *mailTo = NULL; #endif - if (!fileName) + delete_cronfile(fileName); + + if (!getpwnam(fileName)) { + crondlog(LVL7 "ignoring file '%s' (no such user)", fileName); return; + } - DeleteFile(fileName); parser = config_open(fileName); if (!parser) return; maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES; - if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DaemonUid) { + if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DAEMON_UID) { CronFile *file = xzalloc(sizeof(CronFile)); CronLine **pline; int n; - file->cf_User = xstrdup(fileName); - pline = &file->cf_LineBase; + file->cf_username = xstrdup(fileName); + pline = &file->cf_lines; while (1) { CronLine *line; @@ -433,11 +402,11 @@ static void SynchronizeFile(const char *fileName) continue; *pline = line = xzalloc(sizeof(*line)); /* parse date ranges */ - ParseField(file->cf_User, line->cl_Mins, 60, 0, NULL, tokens[0]); - ParseField(file->cf_User, line->cl_Hrs, 24, 0, NULL, tokens[1]); - ParseField(file->cf_User, line->cl_Days, 32, 0, NULL, tokens[2]); - ParseField(file->cf_User, line->cl_Mons, 12, -1, MonAry, tokens[3]); - ParseField(file->cf_User, line->cl_Dow, 7, 0, DowAry, tokens[4]); + 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 @@ -445,20 +414,20 @@ static void SynchronizeFile(const char *fileName) FixDayDow(line); #if ENABLE_FEATURE_CROND_CALL_SENDMAIL /* copy mailto (can be NULL) */ - line->cl_MailTo = xstrdup(mailTo); + line->cl_mailto = xstrdup(mailTo); #endif /* copy command */ - line->cl_Shell = xstrdup(tokens[5]); + line->cl_cmd = xstrdup(tokens[5]); if (DebugOpt) { crondlog(LVL5 " command:%s", tokens[5]); } - pline = &line->cl_Next; + 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; - file->cf_Next = G.FileBase; - G.FileBase = file; + file->cf_next = G.cron_files; + G.cron_files = file; if (maxLines == 0) { crondlog(WARN9 "user %s: too many lines", fileName); @@ -467,7 +436,7 @@ static void SynchronizeFile(const char *fileName) config_close(parser); } -static void CheckUpdates(void) +static void process_cron_update_file(void) { FILE *fi; char buf[256]; @@ -477,36 +446,34 @@ static void CheckUpdates(void) unlink(CRONUPDATE); while (fgets(buf, sizeof(buf), fi) != NULL) { /* use first word only */ - SynchronizeFile(strtok(buf, " \t\r\n")); + skip_non_whitespace(buf)[0] = '\0'; + load_crontab(buf); } fclose(fi); } } -static void SynchronizeDir(void) +static void rescan_crontab_dir(void) { CronFile *file; - /* Attempt to delete the database. */ + + /* Delete all files until we only have ones with running jobs (or none) */ again: - for (file = G.FileBase; file; file = file->cf_Next) { - if (!file->cf_Deleted) { - DeleteFile(file->cf_User); + for (file = G.cron_files; file; file = file->cf_next) { + if (!file->cf_deleted) { + delete_cronfile(file->cf_username); goto again; } } - /* - * Remove cron update file - * - * Re-chdir, in case directory was renamed & deleted, or otherwise - * screwed up. - * - * scan directory and add associated users - */ + /* Remove cron update file */ unlink(CRONUPDATE); - if (chdir(G.CDir) < 0) { - crondlog(DIE9 "chdir(%s)", G.CDir); + /* 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; @@ -517,162 +484,62 @@ static void SynchronizeDir(void) if (strchr(den->d_name, '.') != NULL) { continue; } - if (getpwnam(den->d_name)) { - SynchronizeFile(den->d_name); - } else { - crondlog(LVL7 "ignoring %s", den->d_name); - } + load_crontab(den->d_name); } closedir(dir); } } -/* - * 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 TestJobs(time_t t1, time_t t2) +#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) { - 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; + char *var_val = *pvar_val; - ptm = localtime(&t); - for (file = G.FileBase; file; file = file->cf_Next) { - if (DebugOpt) - crondlog(LVL5 "file %s:", file->cf_User); - if (file->cf_Deleted) - continue; - for (line = file->cf_LineBase; line; line = line->cl_Next) { - if (DebugOpt) - crondlog(LVL5 " line %s", line->cl_Shell); - 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_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); } +#endif -#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) +static void set_env_vars(struct passwd *pas) { - 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); -} +#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 -# define EndJob(user, line) ((line)->cl_Pid = 0) + xsetenv("USER", pas->pw_name); + xsetenv("HOME", pas->pw_dir); #endif + /* currently, we use constant one: */ + /*setenv("SHELL", DEFAULT_SHELL, 1); - done earlier */ +} -/* - * Check for job completion, return number of jobs still running after - * all done. - */ -static int CheckJobs(void) +static void change_user(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; - } - } + /* 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 */ } - nStillRunning += file->cf_Running; } - return nStillRunning; } -#if ENABLE_FEATURE_CROND_CALL_SENDMAIL - // 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) { @@ -801,35 +714,130 @@ 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; @@ -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; |