diff options
| -rw-r--r-- | miscutils/crond.c | 175 |
1 files changed, 88 insertions, 87 deletions
diff --git a/miscutils/crond.c b/miscutils/crond.c index 8441b6c..210da5f 100644 --- a/miscutils/crond.c +++ b/miscutils/crond.c @@ -125,12 +125,6 @@ enum { 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 DebugOpt 0 -#endif - struct globals { unsigned log_level; /* = 8; */ @@ -149,41 +143,50 @@ struct globals { G.crontab_dir_name = CRONTABS; \ } while (0) +/* Log levels: + * 0 is the most verbose, default 8. + * For some reason, in fact only 5, 7 and 8 are used. + */ +static void crondlog(unsigned level, const char *msg, va_list va) +{ + if (level >= G.log_level) { + /* + * We are called only for info meesages. + * Warnings/errors use plain bb_[p]error_msg's, which + * need not touch syslog_level + * (they are ok with LOG_ERR default). + */ + syslog_level = LOG_INFO; + bb_verror_msg(msg, va, /* strerr: */ NULL); + syslog_level = LOG_ERR; + } +} -/* 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 log5(const char *msg, ...) +{ + va_list va; + va_start(va, msg); + crondlog(4, msg, va); + va_end(va); +} -static void crondlog(const char *ctl, ...) __attribute__ ((format (printf, 1, 2))); -static void crondlog(const char *ctl, ...) +static void log7(const char *msg, ...) { va_list va; - unsigned level = (ctl[0] & 0x1f); + va_start(va, msg); + crondlog(7, msg, va); + va_end(va); +} - va_start(va, ctl); - if (level >= G.log_level) { - if (G.log_filename) { - /* If log to file, 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. - */ - syslog_level = (level > 8) ? LOG_ERR : LOG_INFO; - bb_verror_msg(ctl + 1, va, /* strerr: */ NULL); - } +static void log8(const char *msg, ...) +{ + va_list va; + va_start(va, msg); + crondlog(8, msg, va); va_end(va); - if (ctl[0] & 0x80) - exit(20); } + static const char DowAry[] ALIGN1 = "sun""mon""tue""wed""thu""fri""sat" ; @@ -293,12 +296,12 @@ static void ParseField(char *user, char *ary, int modvalue, int off, if (*ptr) { err: - crondlog(WARN9 "user %s: parse error at %s", user, base); + bb_error_msg("user %s: parse error at %s", user, base); return; } - if (DebugOpt && (G.log_level <= 5)) { /* like LVL5 */ - /* can't use crondlog, it inserts '\n' */ + /* can't use log5 (it inserts newlines), open-coding it */ + if (G.log_level <= 5 && logmode != LOGMODE_SYSLOG) { int i; for (i = 0; i < modvalue; ++i) fprintf(stderr, "%d", (unsigned char)ary[i]); @@ -398,7 +401,7 @@ static void load_crontab(const char *fileName) delete_cronfile(fileName); if (!getpwnam(fileName)) { - crondlog(LVL7 "ignoring file '%s' (no such user)", fileName); + log7("ignoring file '%s' (no such user)", fileName); return; } @@ -420,7 +423,7 @@ static void load_crontab(const char *fileName) CronLine *line; if (!--maxLines) { - crondlog(WARN9 "user %s: too many lines", fileName); + bb_error_msg("user %s: too many lines", fileName); break; } @@ -428,8 +431,7 @@ static void load_crontab(const char *fileName) if (!n) break; - if (DebugOpt) - crondlog(LVL5 "user:%s entry:%s", fileName, parser->data); + log5("user:%s entry:%s", fileName, parser->data); /* check if line is setting MAILTO= */ if (0 == strncmp(tokens[0], "MAILTO=", 7)) { @@ -472,9 +474,7 @@ static void load_crontab(const char *fileName) #endif /* copy command */ line->cl_cmd = xstrdup(tokens[5]); - if (DebugOpt) { - crondlog(LVL5 " command:%s", tokens[5]); - } + log5(" 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]); } @@ -519,17 +519,16 @@ static void rescan_crontab_dir(void) /* 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); - } + xchdir(G.crontab_dir_name); /* Scan directory and add associated users */ { DIR *dir = opendir("."); struct dirent *den; + /* xopendir exists, but "can't open '.'" is not informative */ if (!dir) - crondlog(DIE9 "chdir(%s)", "."); /* exits */ + bb_error_msg_and_die("can't open '%s'", G.crontab_dir_name); while ((den = readdir(dir)) != NULL) { if (strchr(den->d_name, '.') != NULL) { continue; @@ -576,10 +575,8 @@ 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(CRON_DIR) < 0) { - crondlog(DIE9 "chdir(%s)", CRON_DIR); /* exits */ - } + bb_error_msg("can't change directory to '%s'", pas->pw_dir); + xchdir(CRON_DIR); } } @@ -591,25 +588,25 @@ fork_job(const char *user, int mailFd, const char *prog, const char *shell_cmd /* if NULL, we run sendmail */ ) { + smallint sv_logmode; struct passwd *pas; pid_t pid; /* prepare things before vfork */ pas = getpwnam(user); if (!pas) { - crondlog(WARN9 "can't get uid for %s", user); + bb_error_msg("can't get uid for %s", user); goto err; } set_env_vars(pas); + sv_logmode = logmode; pid = vfork(); if (pid == 0) { /* CHILD */ /* initgroups, setgid, setuid, and chdir to home or CRON_DIR */ change_user(pas); - if (DebugOpt) { - crondlog(LVL5 "child running %s", prog); - } + log5("child running %s", prog); if (mailFd >= 0) { xmove_fd(mailFd, shell_cmd ? 1 : 0); dup2(1, 2); @@ -617,15 +614,17 @@ fork_job(const char *user, int mailFd, /* 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(EXIT_SUCCESS); + /* + * I want this error message on stderr too, + * even if other messages go only to syslog: + */ + logmode |= LOGMODE_STDIO; + bb_error_msg_and_die("can't execute '%s' for user %s", prog, user); } + logmode = sv_logmode; if (pid < 0) { - crondlog(ERR20 "can't vfork"); + bb_perror_msg("vfork"); err: pid = 0; } /* else: PARENT, FORK SUCCESS */ @@ -658,7 +657,7 @@ static void start_one_job(const char *user, CronLine *line) 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, " + bb_error_msg("can't create mail file %s for user %s, " "discarding output", mailFile, user); } } @@ -731,7 +730,7 @@ static void start_one_job(const char *user, CronLine *line) pas = getpwnam(user); if (!pas) { - crondlog(WARN9 "can't get uid for %s", user); + bb_error_msg("can't get uid for %s", user); goto err; } @@ -744,18 +743,14 @@ static void start_one_job(const char *user, CronLine *line) /* CHILD */ /* initgroups, setgid, setuid, and chdir to home or CRON_DIR */ change_user(pas); - if (DebugOpt) { - crondlog(LVL5 "child running %s", DEFAULT_SHELL); - } + log5("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); + bb_error_msg_and_die("can't execute '%s' for user %s", DEFAULT_SHELL, user); } if (pid < 0) { - /* FORK FAILED */ - crondlog(ERR20 "can't vfork"); + bb_perror_msg("vfork"); err: pid = 0; } @@ -787,24 +782,20 @@ static void flag_starting_jobs(time_t t1, time_t t2) ptm = localtime(&t); for (file = G.cron_files; file; file = file->cf_next) { - if (DebugOpt) - crondlog(LVL5 "file %s:", file->cf_username); + log5("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); + log5(" 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", + log5(" job: %d %s", (int)line->cl_pid, line->cl_cmd); - } if (line->cl_pid > 0) { - crondlog(LVL8 "user %s: process already running: %s", + log8("user %s: process already running: %s", file->cf_username, line->cl_cmd); } else if (line->cl_pid == 0) { line->cl_pid = -1; @@ -833,7 +824,7 @@ static void start_jobs(void) start_one_job(file->cf_username, line); pid = line->cl_pid; - crondlog(LVL8 "USER %s pid %3d cmd %s", + log8("USER %s pid %3d cmd %s", file->cf_username, (int)pid, line->cl_cmd); if (pid < 0) { file->cf_wants_starting = 1; @@ -885,6 +876,15 @@ static int check_completions(void) return num_still_running; } +static void reopen_logfile_to_stderr(void) +{ + if (G.log_filename) { + int logfd = open_or_warn(G.log_filename, O_WRONLY | O_CREAT | O_APPEND); + if (logfd >= 0) + xmove_fd(logfd, STDERR_FILENO); + } +} + int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int crond_main(int argc UNUSED_PARAM, char **argv) { @@ -916,10 +916,12 @@ int crond_main(int argc UNUSED_PARAM, char **argv) logmode = LOGMODE_SYSLOG; } + reopen_logfile_to_stderr(); + 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); + log8("crond (busybox "BB_VER") started, log level %d", G.log_level); rescan_crontab_dir(); write_pidfile(CONFIG_PID_FILE_PATH "/crond.pid"); @@ -932,14 +934,14 @@ int crond_main(int argc UNUSED_PARAM, char **argv) time_t t1; long dt; - t1 = t2; - /* Synchronize to 1 minute, minimum 1 second */ - sleep(sleep_time - (time(NULL) % sleep_time) + 1); - + t1 = t2; + sleep(sleep_time - (time(NULL) % sleep_time)); t2 = time(NULL); dt = (long)t2 - (long)t1; + reopen_logfile_to_stderr(); + /* * The file 'cron.update' is checked to determine new cron * jobs. The directory is rescanned once an hour to deal @@ -967,10 +969,9 @@ int crond_main(int argc UNUSED_PARAM, char **argv) rescan_crontab_dir(); } process_cron_update_file(); - if (DebugOpt) - crondlog(LVL5 "wakeup dt=%ld", dt); + log5("wakeup dt=%ld", dt); if (dt < -60 * 60 || dt > 60 * 60) { - crondlog(WARN9 "time disparity of %ld minutes detected", dt / 60); + bb_error_msg("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 */ |