[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * run as root, but NOT setuid root
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| 4 | *
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| 5 | * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
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[1765] | 6 | * (version 2.3.2)
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[821] | 7 | * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
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| 8 | *
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[2725] | 9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 10 | */
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[3621] | 11 | //config:config CROND
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| 12 | //config: bool "crond"
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| 13 | //config: default y
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| 14 | //config: select FEATURE_SYSLOG
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| 15 | //config: help
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| 16 | //config: Crond is a background daemon that parses individual crontab
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| 17 | //config: files and executes commands on behalf of the users in question.
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| 18 | //config: This is a port of dcron from slackware. It uses files of the
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| 19 | //config: format /var/spool/cron/crontabs/<username> files, for example:
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| 20 | //config: $ cat /var/spool/cron/crontabs/root
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| 21 | //config: # Run daily cron jobs at 4:40 every day:
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| 22 | //config: 40 4 * * * /etc/cron/daily > /dev/null 2>&1
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| 23 | //config:
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| 24 | //config:config FEATURE_CROND_D
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| 25 | //config: bool "Support option -d to redirect output to stderr"
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| 26 | //config: depends on CROND
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| 27 | //config: default y
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| 28 | //config: help
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| 29 | //config: -d N sets loglevel (0:most verbose) and directs all output to stderr.
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| 30 | //config:
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| 31 | //config:config FEATURE_CROND_CALL_SENDMAIL
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| 32 | //config: bool "Report command output via email (using sendmail)"
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| 33 | //config: default y
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| 34 | //config: depends on CROND
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| 35 | //config: help
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| 36 | //config: Command output will be sent to corresponding user via email.
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| 37 | //config:
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| 38 | //config:config FEATURE_CROND_DIR
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| 39 | //config: string "crond spool directory"
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| 40 | //config: default "/var/spool/cron"
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| 41 | //config: depends on CROND || CRONTAB
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| 42 | //config: help
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| 43 | //config: Location of crond spool.
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[821] | 44 |
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[3621] | 45 | //applet:IF_CROND(APPLET(crond, BB_DIR_USR_SBIN, BB_SUID_DROP))
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| 46 |
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| 47 | //kbuild:lib-$(CONFIG_CROND) += crond.o
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| 48 |
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[3232] | 49 | //usage:#define crond_trivial_usage
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| 50 | //usage: "-fbS -l N " IF_FEATURE_CROND_D("-d N ") "-L LOGFILE -c DIR"
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| 51 | //usage:#define crond_full_usage "\n\n"
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| 52 | //usage: " -f Foreground"
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| 53 | //usage: "\n -b Background (default)"
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| 54 | //usage: "\n -S Log to syslog (default)"
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[3621] | 55 | //usage: "\n -l N Set log level. Most verbose:0, default:8"
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[3232] | 56 | //usage: IF_FEATURE_CROND_D(
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[3621] | 57 | //usage: "\n -d N Set log level, log to stderr"
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[3232] | 58 | //usage: )
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[3621] | 59 | //usage: "\n -L FILE Log to FILE"
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| 60 | //usage: "\n -c DIR Cron dir. Default:"CONFIG_FEATURE_CROND_DIR"/crontabs"
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[3232] | 61 |
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[1765] | 62 | #include "libbb.h"
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[3621] | 63 | #include "common_bufsiz.h"
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[2725] | 64 | #include <syslog.h>
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[821] | 65 |
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[2725] | 66 | /* glibc frees previous setenv'ed value when we do next setenv()
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| 67 | * of the same variable. uclibc does not do this! */
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| 68 | #if (defined(__GLIBC__) && !defined(__UCLIBC__)) /* || OTHER_SAFE_LIBC... */
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| 69 | # define SETENV_LEAKS 0
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| 70 | #else
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| 71 | # define SETENV_LEAKS 1
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[821] | 72 | #endif
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[2725] | 73 |
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| 74 |
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[3621] | 75 | #define CRON_DIR CONFIG_FEATURE_CROND_DIR
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[2725] | 76 | #define CRONTABS CONFIG_FEATURE_CROND_DIR "/crontabs"
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[821] | 77 | #ifndef SENDMAIL
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[2725] | 78 | # define SENDMAIL "sendmail"
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[821] | 79 | #endif
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| 80 | #ifndef SENDMAIL_ARGS
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[2725] | 81 | # define SENDMAIL_ARGS "-ti"
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[821] | 82 | #endif
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| 83 | #ifndef CRONUPDATE
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[2725] | 84 | # define CRONUPDATE "cron.update"
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[821] | 85 | #endif
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| 86 | #ifndef MAXLINES
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[2725] | 87 | # define MAXLINES 256 /* max lines in non-root crontabs */
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[821] | 88 | #endif
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| 89 |
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[2725] | 90 |
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[821] | 91 | typedef struct CronFile {
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[2725] | 92 | struct CronFile *cf_next;
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| 93 | struct CronLine *cf_lines;
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| 94 | char *cf_username;
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| 95 | smallint cf_wants_starting; /* bool: one or more jobs ready */
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| 96 | smallint cf_has_running; /* bool: one or more jobs running */
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| 97 | smallint cf_deleted; /* marked for deletion (but still has running jobs) */
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[821] | 98 | } CronFile;
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| 99 |
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| 100 | typedef struct CronLine {
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[2725] | 101 | struct CronLine *cl_next;
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| 102 | char *cl_cmd; /* shell command */
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| 103 | pid_t cl_pid; /* >0:running, <0:needs to be started in this minute, 0:dormant */
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| 104 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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| 105 | int cl_empty_mail_size; /* size of mail header only, 0 if no mailfile */
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| 106 | char *cl_mailto; /* whom to mail results, may be NULL */
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| 107 | #endif
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[3621] | 108 | char *cl_shell;
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[2725] | 109 | /* ordered by size, not in natural order. makes code smaller: */
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| 110 | char cl_Dow[7]; /* 0-6, beginning sunday */
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| 111 | char cl_Mons[12]; /* 0-11 */
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| 112 | char cl_Hrs[24]; /* 0-23 */
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| 113 | char cl_Days[32]; /* 1-31 */
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| 114 | char cl_Mins[60]; /* 0-59 */
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[821] | 115 | } CronLine;
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| 116 |
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| 117 |
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[2725] | 118 | #define DAEMON_UID 0
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[821] | 119 |
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[2725] | 120 |
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| 121 | enum {
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| 122 | OPT_l = (1 << 0),
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| 123 | OPT_L = (1 << 1),
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| 124 | OPT_f = (1 << 2),
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| 125 | OPT_b = (1 << 3),
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| 126 | OPT_S = (1 << 4),
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| 127 | OPT_c = (1 << 5),
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| 128 | OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D,
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| 129 | };
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[821] | 130 |
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[2725] | 131 | struct globals {
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| 132 | unsigned log_level; /* = 8; */
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| 133 | time_t crontab_dir_mtime;
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| 134 | const char *log_filename;
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| 135 | const char *crontab_dir_name; /* = CRONTABS; */
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| 136 | CronFile *cron_files;
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| 137 | #if SETENV_LEAKS
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| 138 | char *env_var_user;
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| 139 | char *env_var_home;
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[3621] | 140 | char *env_var_shell;
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| 141 | char *env_var_logname;
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[821] | 142 | #endif
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[2725] | 143 | } FIX_ALIASING;
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[3621] | 144 | #define G (*(struct globals*)bb_common_bufsiz1)
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[2725] | 145 | #define INIT_G() do { \
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[3621] | 146 | setup_common_bufsiz(); \
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[2725] | 147 | G.log_level = 8; \
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| 148 | G.crontab_dir_name = CRONTABS; \
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| 149 | } while (0)
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[821] | 150 |
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[3621] | 151 | /* Log levels:
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| 152 | * 0 is the most verbose, default 8.
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| 153 | * For some reason, in fact only 5, 7 and 8 are used.
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| 154 | */
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| 155 | static void crondlog(unsigned level, const char *msg, va_list va)
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| 156 | {
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| 157 | if (level >= G.log_level) {
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| 158 | /*
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| 159 | * We are called only for info meesages.
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| 160 | * Warnings/errors use plain bb_[p]error_msg's, which
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| 161 | * need not touch syslog_level
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| 162 | * (they are ok with LOG_ERR default).
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| 163 | */
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| 164 | syslog_level = LOG_INFO;
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| 165 | bb_verror_msg(msg, va, /* strerr: */ NULL);
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| 166 | syslog_level = LOG_ERR;
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| 167 | }
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| 168 | }
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[821] | 169 |
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[3621] | 170 | static void log5(const char *msg, ...)
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| 171 | {
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| 172 | va_list va;
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| 173 | va_start(va, msg);
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| 174 | crondlog(4, msg, va);
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| 175 | va_end(va);
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| 176 | }
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[821] | 177 |
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[3621] | 178 | static void log7(const char *msg, ...)
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[821] | 179 | {
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| 180 | va_list va;
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[3621] | 181 | va_start(va, msg);
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| 182 | crondlog(7, msg, va);
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| 183 | va_end(va);
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| 184 | }
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[821] | 185 |
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[3621] | 186 | static void log8(const char *msg, ...)
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| 187 | {
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| 188 | va_list va;
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| 189 | va_start(va, msg);
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| 190 | crondlog(8, msg, va);
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[821] | 191 | va_end(va);
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| 192 | }
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| 193 |
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[3621] | 194 |
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[1765] | 195 | static const char DowAry[] ALIGN1 =
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| 196 | "sun""mon""tue""wed""thu""fri""sat"
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| 197 | ;
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[821] | 198 |
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[1765] | 199 | static const char MonAry[] ALIGN1 =
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| 200 | "jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
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| 201 | ;
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[821] | 202 |
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[2725] | 203 | static void ParseField(char *user, char *ary, int modvalue, int off,
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[1765] | 204 | const char *names, char *ptr)
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| 205 | /* 'names' is a pointer to a set of 3-char abbreviations */
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[821] | 206 | {
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| 207 | char *base = ptr;
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| 208 | int n1 = -1;
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| 209 | int n2 = -1;
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| 210 |
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[2725] | 211 | // this can't happen due to config_read()
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| 212 | /*if (base == NULL)
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| 213 | return;*/
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[821] | 214 |
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[2725] | 215 | while (1) {
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[821] | 216 | int skip = 0;
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| 217 |
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| 218 | /* Handle numeric digit or symbol or '*' */
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| 219 | if (*ptr == '*') {
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[2725] | 220 | n1 = 0; /* everything will be filled */
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[821] | 221 | n2 = modvalue - 1;
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| 222 | skip = 1;
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| 223 | ++ptr;
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[2725] | 224 | } else if (isdigit(*ptr)) {
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| 225 | char *endp;
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[821] | 226 | if (n1 < 0) {
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[2725] | 227 | n1 = strtol(ptr, &endp, 10) + off;
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[821] | 228 | } else {
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[2725] | 229 | n2 = strtol(ptr, &endp, 10) + off;
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[821] | 230 | }
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[2725] | 231 | ptr = endp; /* gcc likes temp var for &endp */
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[821] | 232 | skip = 1;
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| 233 | } else if (names) {
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| 234 | int i;
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| 235 |
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[1765] | 236 | for (i = 0; names[i]; i += 3) {
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| 237 | /* was using strncmp before... */
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| 238 | if (strncasecmp(ptr, &names[i], 3) == 0) {
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| 239 | ptr += 3;
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| 240 | if (n1 < 0) {
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| 241 | n1 = i / 3;
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| 242 | } else {
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| 243 | n2 = i / 3;
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| 244 | }
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| 245 | skip = 1;
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[821] | 246 | break;
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| 247 | }
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| 248 | }
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| 249 | }
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| 250 |
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| 251 | /* handle optional range '-' */
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| 252 | if (skip == 0) {
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[2725] | 253 | goto err;
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[821] | 254 | }
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| 255 | if (*ptr == '-' && n2 < 0) {
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| 256 | ++ptr;
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| 257 | continue;
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| 258 | }
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| 259 |
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| 260 | /*
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| 261 | * collapse single-value ranges, handle skipmark, and fill
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| 262 | * in the character array appropriately.
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| 263 | */
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| 264 | if (n2 < 0) {
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| 265 | n2 = n1;
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| 266 | }
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| 267 | if (*ptr == '/') {
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[2725] | 268 | char *endp;
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| 269 | skip = strtol(ptr + 1, &endp, 10);
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| 270 | ptr = endp; /* gcc likes temp var for &endp */
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[821] | 271 | }
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[2725] | 272 |
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[821] | 273 | /*
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| 274 | * fill array, using a failsafe is the easiest way to prevent
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| 275 | * an endless loop
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| 276 | */
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| 277 | {
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| 278 | int s0 = 1;
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| 279 | int failsafe = 1024;
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| 280 |
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| 281 | --n1;
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| 282 | do {
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| 283 | n1 = (n1 + 1) % modvalue;
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| 284 |
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| 285 | if (--s0 == 0) {
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| 286 | ary[n1 % modvalue] = 1;
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| 287 | s0 = skip;
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| 288 | }
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[2725] | 289 | if (--failsafe == 0) {
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| 290 | goto err;
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| 291 | }
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| 292 | } while (n1 != n2);
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[821] | 293 | }
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| 294 | if (*ptr != ',') {
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| 295 | break;
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| 296 | }
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| 297 | ++ptr;
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| 298 | n1 = -1;
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| 299 | n2 = -1;
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| 300 | }
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| 301 |
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[2725] | 302 | if (*ptr) {
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| 303 | err:
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[3621] | 304 | bb_error_msg("user %s: parse error at %s", user, base);
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[2725] | 305 | return;
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[821] | 306 | }
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| 307 |
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[3621] | 308 | /* can't use log5 (it inserts newlines), open-coding it */
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| 309 | if (G.log_level <= 5 && logmode != LOGMODE_SYSLOG) {
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[821] | 310 | int i;
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[2725] | 311 | for (i = 0; i < modvalue; ++i)
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| 312 | fprintf(stderr, "%d", (unsigned char)ary[i]);
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| 313 | bb_putchar_stderr('\n');
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[821] | 314 | }
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| 315 | }
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| 316 |
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[2725] | 317 | static void FixDayDow(CronLine *line)
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[821] | 318 | {
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[2725] | 319 | unsigned i;
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[821] | 320 | int weekUsed = 0;
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| 321 | int daysUsed = 0;
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| 322 |
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[2725] | 323 | for (i = 0; i < ARRAY_SIZE(line->cl_Dow); ++i) {
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[821] | 324 | if (line->cl_Dow[i] == 0) {
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| 325 | weekUsed = 1;
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| 326 | break;
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| 327 | }
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| 328 | }
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[2725] | 329 | for (i = 0; i < ARRAY_SIZE(line->cl_Days); ++i) {
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[821] | 330 | if (line->cl_Days[i] == 0) {
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| 331 | daysUsed = 1;
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| 332 | break;
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| 333 | }
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| 334 | }
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[2725] | 335 | if (weekUsed != daysUsed) {
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| 336 | if (weekUsed)
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| 337 | memset(line->cl_Days, 0, sizeof(line->cl_Days));
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| 338 | else /* daysUsed */
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| 339 | memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
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[821] | 340 | }
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| 341 | }
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| 342 |
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[2725] | 343 | /*
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| 344 | * delete_cronfile() - delete user database
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| 345 | *
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| 346 | * Note: multiple entries for same user may exist if we were unable to
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| 347 | * completely delete a database due to running processes.
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| 348 | */
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| 349 | //FIXME: we will start a new job even if the old job is running
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| 350 | //if crontab was reloaded: crond thinks that "new" job is different from "old"
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| 351 | //even if they are in fact completely the same. Example
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| 352 | //Crontab was:
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| 353 | // 0-59 * * * * job1
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| 354 | // 0-59 * * * * long_running_job2
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| 355 | //User edits crontab to:
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| 356 | // 0-59 * * * * job1_updated
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| 357 | // 0-59 * * * * long_running_job2
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| 358 | //Bug: crond can now start another long_running_job2 even if old one
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| 359 | //is still running.
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| 360 | //OTOH most other versions of cron do not wait for job termination anyway,
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| 361 | //they end up with multiple copies of jobs if they don't terminate soon enough.
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| 362 | static void delete_cronfile(const char *userName)
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| 363 | {
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| 364 | CronFile **pfile = &G.cron_files;
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| 365 | CronFile *file;
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[821] | 366 |
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[2725] | 367 | while ((file = *pfile) != NULL) {
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| 368 | if (strcmp(userName, file->cf_username) == 0) {
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| 369 | CronLine **pline = &file->cf_lines;
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| 370 | CronLine *line;
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[821] | 371 |
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[2725] | 372 | file->cf_has_running = 0;
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| 373 | file->cf_deleted = 1;
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[821] | 374 |
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[2725] | 375 | while ((line = *pline) != NULL) {
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| 376 | if (line->cl_pid > 0) {
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| 377 | file->cf_has_running = 1;
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| 378 | pline = &line->cl_next;
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| 379 | } else {
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| 380 | *pline = line->cl_next;
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| 381 | free(line->cl_cmd);
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| 382 | free(line);
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| 383 | }
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| 384 | }
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| 385 | if (file->cf_has_running == 0) {
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| 386 | *pfile = file->cf_next;
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| 387 | free(file->cf_username);
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| 388 | free(file);
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| 389 | continue;
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| 390 | }
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| 391 | }
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| 392 | pfile = &file->cf_next;
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[821] | 393 | }
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[2725] | 394 | }
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[821] | 395 |
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[2725] | 396 | static void load_crontab(const char *fileName)
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| 397 | {
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| 398 | struct parser_t *parser;
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| 399 | struct stat sbuf;
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| 400 | int maxLines;
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| 401 | char *tokens[6];
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| 402 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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| 403 | char *mailTo = NULL;
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| 404 | #endif
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[3621] | 405 | char *shell = NULL;
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[821] | 406 |
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[2725] | 407 | delete_cronfile(fileName);
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[821] | 408 |
|
---|
[2725] | 409 | if (!getpwnam(fileName)) {
|
---|
[3621] | 410 | log7("ignoring file '%s' (no such user)", fileName);
|
---|
[2725] | 411 | return;
|
---|
| 412 | }
|
---|
[821] | 413 |
|
---|
[2725] | 414 | parser = config_open(fileName);
|
---|
| 415 | if (!parser)
|
---|
| 416 | return;
|
---|
[821] | 417 |
|
---|
[2725] | 418 | maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES;
|
---|
[821] | 419 |
|
---|
[2725] | 420 | if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DAEMON_UID) {
|
---|
| 421 | CronFile *file = xzalloc(sizeof(CronFile));
|
---|
| 422 | CronLine **pline;
|
---|
| 423 | int n;
|
---|
[821] | 424 |
|
---|
[2725] | 425 | file->cf_username = xstrdup(fileName);
|
---|
| 426 | pline = &file->cf_lines;
|
---|
[821] | 427 |
|
---|
[2725] | 428 | while (1) {
|
---|
| 429 | CronLine *line;
|
---|
[821] | 430 |
|
---|
[3621] | 431 | if (!--maxLines) {
|
---|
| 432 | bb_error_msg("user %s: too many lines", fileName);
|
---|
[2725] | 433 | break;
|
---|
[3621] | 434 | }
|
---|
| 435 |
|
---|
[2725] | 436 | n = config_read(parser, tokens, 6, 1, "# \t", PARSE_NORMAL | PARSE_KEEP_COPY);
|
---|
| 437 | if (!n)
|
---|
| 438 | break;
|
---|
[821] | 439 |
|
---|
[3621] | 440 | log5("user:%s entry:%s", fileName, parser->data);
|
---|
[821] | 441 |
|
---|
[2725] | 442 | /* check if line is setting MAILTO= */
|
---|
[3621] | 443 | if (is_prefixed_with(tokens[0], "MAILTO=")) {
|
---|
[2725] | 444 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
| 445 | free(mailTo);
|
---|
| 446 | mailTo = (tokens[0][7]) ? xstrdup(&tokens[0][7]) : NULL;
|
---|
| 447 | #endif /* otherwise just ignore such lines */
|
---|
| 448 | continue;
|
---|
| 449 | }
|
---|
[3621] | 450 | if (is_prefixed_with(tokens[0], "SHELL=")) {
|
---|
| 451 | free(shell);
|
---|
| 452 | shell = xstrdup(&tokens[0][6]);
|
---|
| 453 | continue;
|
---|
| 454 | }
|
---|
| 455 | //TODO: handle HOME= too? "man crontab" says:
|
---|
| 456 | //name = value
|
---|
| 457 | //
|
---|
| 458 | //where the spaces around the equal-sign (=) are optional, and any subsequent
|
---|
| 459 | //non-leading spaces in value will be part of the value assigned to name.
|
---|
| 460 | //The value string may be placed in quotes (single or double, but matching)
|
---|
| 461 | //to preserve leading or trailing blanks.
|
---|
| 462 | //
|
---|
| 463 | //Several environment variables are set up automatically by the cron(8) daemon.
|
---|
| 464 | //SHELL is set to /bin/sh, and LOGNAME and HOME are set from the /etc/passwd
|
---|
| 465 | //line of the crontab's owner. HOME and SHELL may be overridden by settings
|
---|
| 466 | //in the crontab; LOGNAME may not.
|
---|
| 467 |
|
---|
[2725] | 468 | /* check if a minimum of tokens is specified */
|
---|
| 469 | if (n < 6)
|
---|
| 470 | continue;
|
---|
| 471 | *pline = line = xzalloc(sizeof(*line));
|
---|
| 472 | /* parse date ranges */
|
---|
| 473 | ParseField(file->cf_username, line->cl_Mins, 60, 0, NULL, tokens[0]);
|
---|
| 474 | ParseField(file->cf_username, line->cl_Hrs, 24, 0, NULL, tokens[1]);
|
---|
| 475 | ParseField(file->cf_username, line->cl_Days, 32, 0, NULL, tokens[2]);
|
---|
| 476 | ParseField(file->cf_username, line->cl_Mons, 12, -1, MonAry, tokens[3]);
|
---|
| 477 | ParseField(file->cf_username, line->cl_Dow, 7, 0, DowAry, tokens[4]);
|
---|
| 478 | /*
|
---|
| 479 | * fix days and dow - if one is not "*" and the other
|
---|
| 480 | * is "*", the other is set to 0, and vise-versa
|
---|
| 481 | */
|
---|
| 482 | FixDayDow(line);
|
---|
| 483 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
| 484 | /* copy mailto (can be NULL) */
|
---|
| 485 | line->cl_mailto = xstrdup(mailTo);
|
---|
[821] | 486 | #endif
|
---|
[3621] | 487 | line->cl_shell = xstrdup(shell);
|
---|
[2725] | 488 | /* copy command */
|
---|
| 489 | line->cl_cmd = xstrdup(tokens[5]);
|
---|
| 490 | pline = &line->cl_next;
|
---|
| 491 | //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]);
|
---|
| 492 | }
|
---|
| 493 | *pline = NULL;
|
---|
[821] | 494 |
|
---|
[2725] | 495 | file->cf_next = G.cron_files;
|
---|
| 496 | G.cron_files = file;
|
---|
[821] | 497 | }
|
---|
[2725] | 498 | config_close(parser);
|
---|
[3621] | 499 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
| 500 | free(mailTo);
|
---|
| 501 | #endif
|
---|
| 502 | free(shell);
|
---|
[821] | 503 | }
|
---|
| 504 |
|
---|
[2725] | 505 | static void process_cron_update_file(void)
|
---|
[821] | 506 | {
|
---|
| 507 | FILE *fi;
|
---|
| 508 | char buf[256];
|
---|
| 509 |
|
---|
[2725] | 510 | fi = fopen_for_read(CRONUPDATE);
|
---|
[821] | 511 | if (fi != NULL) {
|
---|
[2725] | 512 | unlink(CRONUPDATE);
|
---|
[821] | 513 | while (fgets(buf, sizeof(buf), fi) != NULL) {
|
---|
[2725] | 514 | /* use first word only */
|
---|
| 515 | skip_non_whitespace(buf)[0] = '\0';
|
---|
| 516 | load_crontab(buf);
|
---|
[821] | 517 | }
|
---|
| 518 | fclose(fi);
|
---|
| 519 | }
|
---|
| 520 | }
|
---|
| 521 |
|
---|
[2725] | 522 | static void rescan_crontab_dir(void)
|
---|
[821] | 523 | {
|
---|
[2725] | 524 | CronFile *file;
|
---|
[821] | 525 |
|
---|
[2725] | 526 | /* Delete all files until we only have ones with running jobs (or none) */
|
---|
| 527 | again:
|
---|
| 528 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 529 | if (!file->cf_deleted) {
|
---|
| 530 | delete_cronfile(file->cf_username);
|
---|
| 531 | goto again;
|
---|
[821] | 532 | }
|
---|
| 533 | }
|
---|
| 534 |
|
---|
[2725] | 535 | /* Remove cron update file */
|
---|
| 536 | unlink(CRONUPDATE);
|
---|
| 537 | /* Re-chdir, in case directory was renamed & deleted */
|
---|
[3621] | 538 | xchdir(G.crontab_dir_name);
|
---|
[821] | 539 |
|
---|
[2725] | 540 | /* Scan directory and add associated users */
|
---|
[821] | 541 | {
|
---|
| 542 | DIR *dir = opendir(".");
|
---|
| 543 | struct dirent *den;
|
---|
| 544 |
|
---|
[3621] | 545 | /* xopendir exists, but "can't open '.'" is not informative */
|
---|
[2725] | 546 | if (!dir)
|
---|
[3621] | 547 | bb_error_msg_and_die("can't open '%s'", G.crontab_dir_name);
|
---|
[2725] | 548 | while ((den = readdir(dir)) != NULL) {
|
---|
| 549 | if (strchr(den->d_name, '.') != NULL) {
|
---|
| 550 | continue;
|
---|
[821] | 551 | }
|
---|
[2725] | 552 | load_crontab(den->d_name);
|
---|
[821] | 553 | }
|
---|
[2725] | 554 | closedir(dir);
|
---|
[821] | 555 | }
|
---|
| 556 | }
|
---|
| 557 |
|
---|
[2725] | 558 | #if SETENV_LEAKS
|
---|
| 559 | /* We set environment *before* vfork (because we want to use vfork),
|
---|
| 560 | * so we cannot use setenv() - repeated calls to setenv() may leak memory!
|
---|
| 561 | * Using putenv(), and freeing memory after unsetenv() won't leak */
|
---|
| 562 | static void safe_setenv(char **pvar_val, const char *var, const char *val)
|
---|
[821] | 563 | {
|
---|
[2725] | 564 | char *var_val = *pvar_val;
|
---|
[821] | 565 |
|
---|
[2725] | 566 | if (var_val) {
|
---|
| 567 | bb_unsetenv_and_free(var_val);
|
---|
[821] | 568 | }
|
---|
[2725] | 569 | *pvar_val = xasprintf("%s=%s", var, val);
|
---|
| 570 | putenv(*pvar_val);
|
---|
[821] | 571 | }
|
---|
[2725] | 572 | #endif
|
---|
[821] | 573 |
|
---|
[3621] | 574 | static void set_env_vars(struct passwd *pas, const char *shell)
|
---|
[821] | 575 | {
|
---|
[3621] | 576 | /* POSIX requires crond to set up at least HOME, LOGNAME, PATH, SHELL.
|
---|
| 577 | * We assume crond inherited suitable PATH.
|
---|
| 578 | */
|
---|
[2725] | 579 | #if SETENV_LEAKS
|
---|
[3621] | 580 | safe_setenv(&G.env_var_logname, "LOGNAME", pas->pw_name);
|
---|
[2725] | 581 | safe_setenv(&G.env_var_user, "USER", pas->pw_name);
|
---|
| 582 | safe_setenv(&G.env_var_home, "HOME", pas->pw_dir);
|
---|
[3621] | 583 | safe_setenv(&G.env_var_shell, "SHELL", shell);
|
---|
[2725] | 584 | #else
|
---|
[3621] | 585 | xsetenv("LOGNAME", pas->pw_name);
|
---|
[2725] | 586 | xsetenv("USER", pas->pw_name);
|
---|
| 587 | xsetenv("HOME", pas->pw_dir);
|
---|
[3621] | 588 | xsetenv("SHELL", shell);
|
---|
[821] | 589 | #endif
|
---|
| 590 | }
|
---|
| 591 |
|
---|
[2725] | 592 | static void change_user(struct passwd *pas)
|
---|
[821] | 593 | {
|
---|
[2725] | 594 | /* careful: we're after vfork! */
|
---|
| 595 | change_identity(pas); /* - initgroups, setgid, setuid */
|
---|
| 596 | if (chdir(pas->pw_dir) < 0) {
|
---|
[3621] | 597 | bb_error_msg("can't change directory to '%s'", pas->pw_dir);
|
---|
| 598 | xchdir(CRON_DIR);
|
---|
[821] | 599 | }
|
---|
| 600 | }
|
---|
| 601 |
|
---|
[2725] | 602 | // TODO: sendmail should be _run-time_ option, not compile-time!
|
---|
| 603 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
[821] | 604 |
|
---|
[2725] | 605 | static pid_t
|
---|
[3621] | 606 | fork_job(const char *user, int mailFd, CronLine *line, bool run_sendmail)
|
---|
| 607 | {
|
---|
[2725] | 608 | struct passwd *pas;
|
---|
[3621] | 609 | const char *shell, *prog;
|
---|
| 610 | smallint sv_logmode;
|
---|
[2725] | 611 | pid_t pid;
|
---|
[821] | 612 |
|
---|
[2725] | 613 | /* prepare things before vfork */
|
---|
| 614 | pas = getpwnam(user);
|
---|
| 615 | if (!pas) {
|
---|
[3621] | 616 | bb_error_msg("can't get uid for %s", user);
|
---|
[2725] | 617 | goto err;
|
---|
[821] | 618 | }
|
---|
| 619 |
|
---|
[3621] | 620 | shell = line->cl_shell ? line->cl_shell : DEFAULT_SHELL;
|
---|
| 621 | prog = run_sendmail ? SENDMAIL : shell;
|
---|
| 622 |
|
---|
| 623 | set_env_vars(pas, shell);
|
---|
| 624 |
|
---|
| 625 | sv_logmode = logmode;
|
---|
[2725] | 626 | pid = vfork();
|
---|
[821] | 627 | if (pid == 0) {
|
---|
| 628 | /* CHILD */
|
---|
[3621] | 629 | /* initgroups, setgid, setuid, and chdir to home or CRON_DIR */
|
---|
[2725] | 630 | change_user(pas);
|
---|
[3621] | 631 | log5("child running %s", prog);
|
---|
[821] | 632 | if (mailFd >= 0) {
|
---|
[3621] | 633 | xmove_fd(mailFd, run_sendmail ? 0 : 1);
|
---|
[2725] | 634 | dup2(1, 2);
|
---|
[821] | 635 | }
|
---|
[2725] | 636 | /* crond 3.0pl1-100 puts tasks in separate process groups */
|
---|
| 637 | bb_setpgrp();
|
---|
[3621] | 638 | if (!run_sendmail)
|
---|
| 639 | execlp(prog, prog, "-c", line->cl_cmd, (char *) NULL);
|
---|
| 640 | else
|
---|
| 641 | execlp(prog, prog, SENDMAIL_ARGS, (char *) NULL);
|
---|
| 642 | /*
|
---|
| 643 | * I want this error message on stderr too,
|
---|
| 644 | * even if other messages go only to syslog:
|
---|
| 645 | */
|
---|
| 646 | logmode |= LOGMODE_STDIO;
|
---|
| 647 | bb_error_msg_and_die("can't execute '%s' for user %s", prog, user);
|
---|
[2725] | 648 | }
|
---|
[3621] | 649 | logmode = sv_logmode;
|
---|
[2725] | 650 |
|
---|
| 651 | if (pid < 0) {
|
---|
[3621] | 652 | bb_perror_msg("vfork");
|
---|
[2725] | 653 | err:
|
---|
| 654 | pid = 0;
|
---|
| 655 | } /* else: PARENT, FORK SUCCESS */
|
---|
[821] | 656 |
|
---|
| 657 | /*
|
---|
| 658 | * Close the mail file descriptor.. we can't just leave it open in
|
---|
| 659 | * a structure, closing it later, because we might run out of descriptors
|
---|
| 660 | */
|
---|
| 661 | if (mailFd >= 0) {
|
---|
| 662 | close(mailFd);
|
---|
| 663 | }
|
---|
[2725] | 664 | return pid;
|
---|
[821] | 665 | }
|
---|
| 666 |
|
---|
[2725] | 667 | static void start_one_job(const char *user, CronLine *line)
|
---|
[821] | 668 | {
|
---|
| 669 | char mailFile[128];
|
---|
[2725] | 670 | int mailFd = -1;
|
---|
[821] | 671 |
|
---|
[2725] | 672 | line->cl_pid = 0;
|
---|
| 673 | line->cl_empty_mail_size = 0;
|
---|
[821] | 674 |
|
---|
[2725] | 675 | if (line->cl_mailto) {
|
---|
| 676 | /* Open mail file (owner is root so nobody can screw with it) */
|
---|
[3621] | 677 | snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", CRON_DIR, user, getpid());
|
---|
[2725] | 678 | mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
|
---|
[821] | 679 |
|
---|
[2725] | 680 | if (mailFd >= 0) {
|
---|
| 681 | fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", line->cl_mailto,
|
---|
| 682 | line->cl_cmd);
|
---|
| 683 | line->cl_empty_mail_size = lseek(mailFd, 0, SEEK_CUR);
|
---|
| 684 | } else {
|
---|
[3621] | 685 | bb_error_msg("can't create mail file %s for user %s, "
|
---|
[2725] | 686 | "discarding output", mailFile, user);
|
---|
| 687 | }
|
---|
| 688 | }
|
---|
[821] | 689 |
|
---|
[3621] | 690 | line->cl_pid = fork_job(user, mailFd, line, /*sendmail?*/ 0);
|
---|
[821] | 691 | if (mailFd >= 0) {
|
---|
[2725] | 692 | if (line->cl_pid <= 0) {
|
---|
| 693 | unlink(mailFile);
|
---|
| 694 | } else {
|
---|
| 695 | /* rename mail-file based on pid of process */
|
---|
[3621] | 696 | char *mailFile2 = xasprintf("%s/cron.%s.%d", CRON_DIR, user, (int)line->cl_pid);
|
---|
[2725] | 697 | rename(mailFile, mailFile2); // TODO: xrename?
|
---|
| 698 | free(mailFile2);
|
---|
| 699 | }
|
---|
[821] | 700 | }
|
---|
| 701 | }
|
---|
| 702 |
|
---|
| 703 | /*
|
---|
[2725] | 704 | * process_finished_job - called when job terminates and when mail terminates
|
---|
[821] | 705 | */
|
---|
[2725] | 706 | static void process_finished_job(const char *user, CronLine *line)
|
---|
[821] | 707 | {
|
---|
[2725] | 708 | pid_t pid;
|
---|
[821] | 709 | int mailFd;
|
---|
| 710 | char mailFile[128];
|
---|
| 711 | struct stat sbuf;
|
---|
| 712 |
|
---|
[2725] | 713 | pid = line->cl_pid;
|
---|
| 714 | line->cl_pid = 0;
|
---|
| 715 | if (pid <= 0) {
|
---|
| 716 | /* No job */
|
---|
[821] | 717 | return;
|
---|
| 718 | }
|
---|
[2725] | 719 | if (line->cl_empty_mail_size <= 0) {
|
---|
| 720 | /* End of job and no mail file, or end of sendmail job */
|
---|
[821] | 721 | return;
|
---|
| 722 | }
|
---|
| 723 |
|
---|
| 724 | /*
|
---|
[2725] | 725 | * End of primary job - check for mail file.
|
---|
| 726 | * If size has changed and the file is still valid, we send it.
|
---|
[821] | 727 | */
|
---|
[3621] | 728 | snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", CRON_DIR, user, (int)pid);
|
---|
[821] | 729 | mailFd = open(mailFile, O_RDONLY);
|
---|
[2725] | 730 | unlink(mailFile);
|
---|
[821] | 731 | if (mailFd < 0) {
|
---|
| 732 | return;
|
---|
| 733 | }
|
---|
| 734 |
|
---|
[2725] | 735 | if (fstat(mailFd, &sbuf) < 0
|
---|
| 736 | || sbuf.st_uid != DAEMON_UID
|
---|
| 737 | || sbuf.st_nlink != 0
|
---|
| 738 | || sbuf.st_size == line->cl_empty_mail_size
|
---|
[1765] | 739 | || !S_ISREG(sbuf.st_mode)
|
---|
| 740 | ) {
|
---|
[821] | 741 | close(mailFd);
|
---|
| 742 | return;
|
---|
| 743 | }
|
---|
[2725] | 744 | line->cl_empty_mail_size = 0;
|
---|
| 745 | /* if (line->cl_mailto) - always true if cl_empty_mail_size was nonzero */
|
---|
[3621] | 746 | line->cl_pid = fork_job(user, mailFd, line, /*sendmail?*/ 1);
|
---|
[821] | 747 | }
|
---|
| 748 |
|
---|
[2725] | 749 | #else /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|
| 750 |
|
---|
| 751 | static void start_one_job(const char *user, CronLine *line)
|
---|
[821] | 752 | {
|
---|
[3621] | 753 | const char *shell;
|
---|
[2725] | 754 | struct passwd *pas;
|
---|
| 755 | pid_t pid;
|
---|
| 756 |
|
---|
| 757 | pas = getpwnam(user);
|
---|
| 758 | if (!pas) {
|
---|
[3621] | 759 | bb_error_msg("can't get uid for %s", user);
|
---|
[2725] | 760 | goto err;
|
---|
| 761 | }
|
---|
| 762 |
|
---|
| 763 | /* Prepare things before vfork */
|
---|
[3621] | 764 | shell = line->cl_shell ? line->cl_shell : DEFAULT_SHELL;
|
---|
| 765 | set_env_vars(pas, shell);
|
---|
[2725] | 766 |
|
---|
[821] | 767 | /* Fork as the user in question and run program */
|
---|
[2725] | 768 | pid = vfork();
|
---|
[821] | 769 | if (pid == 0) {
|
---|
| 770 | /* CHILD */
|
---|
[3621] | 771 | /* initgroups, setgid, setuid, and chdir to home or CRON_DIR */
|
---|
[2725] | 772 | change_user(pas);
|
---|
[3621] | 773 | log5("child running %s", shell);
|
---|
[2725] | 774 | /* crond 3.0pl1-100 puts tasks in separate process groups */
|
---|
| 775 | bb_setpgrp();
|
---|
[3621] | 776 | execl(shell, shell, "-c", line->cl_cmd, (char *) NULL);
|
---|
| 777 | bb_error_msg_and_die("can't execute '%s' for user %s", shell, user);
|
---|
[2725] | 778 | }
|
---|
| 779 | if (pid < 0) {
|
---|
[3621] | 780 | bb_perror_msg("vfork");
|
---|
[2725] | 781 | err:
|
---|
| 782 | pid = 0;
|
---|
| 783 | }
|
---|
| 784 | line->cl_pid = pid;
|
---|
| 785 | }
|
---|
[821] | 786 |
|
---|
[2725] | 787 | #define process_finished_job(user, line) ((line)->cl_pid = 0)
|
---|
[821] | 788 |
|
---|
[2725] | 789 | #endif /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|
| 790 |
|
---|
| 791 | /*
|
---|
| 792 | * Determine which jobs need to be run. Under normal conditions, the
|
---|
| 793 | * period is about a minute (one scan). Worst case it will be one
|
---|
| 794 | * hour (60 scans).
|
---|
| 795 | */
|
---|
| 796 | static void flag_starting_jobs(time_t t1, time_t t2)
|
---|
| 797 | {
|
---|
| 798 | time_t t;
|
---|
| 799 |
|
---|
| 800 | /* Find jobs > t1 and <= t2 */
|
---|
| 801 |
|
---|
| 802 | for (t = t1 - t1 % 60; t <= t2; t += 60) {
|
---|
| 803 | struct tm *ptm;
|
---|
| 804 | CronFile *file;
|
---|
| 805 | CronLine *line;
|
---|
| 806 |
|
---|
| 807 | if (t <= t1)
|
---|
| 808 | continue;
|
---|
| 809 |
|
---|
| 810 | ptm = localtime(&t);
|
---|
| 811 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
[3621] | 812 | log5("file %s:", file->cf_username);
|
---|
[2725] | 813 | if (file->cf_deleted)
|
---|
| 814 | continue;
|
---|
| 815 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
[3621] | 816 | log5(" line %s", line->cl_cmd);
|
---|
[2725] | 817 | if (line->cl_Mins[ptm->tm_min]
|
---|
| 818 | && line->cl_Hrs[ptm->tm_hour]
|
---|
| 819 | && (line->cl_Days[ptm->tm_mday] || line->cl_Dow[ptm->tm_wday])
|
---|
| 820 | && line->cl_Mons[ptm->tm_mon]
|
---|
| 821 | ) {
|
---|
[3621] | 822 | log5(" job: %d %s",
|
---|
[2725] | 823 | (int)line->cl_pid, line->cl_cmd);
|
---|
| 824 | if (line->cl_pid > 0) {
|
---|
[3621] | 825 | log8("user %s: process already running: %s",
|
---|
[2725] | 826 | file->cf_username, line->cl_cmd);
|
---|
| 827 | } else if (line->cl_pid == 0) {
|
---|
| 828 | line->cl_pid = -1;
|
---|
| 829 | file->cf_wants_starting = 1;
|
---|
| 830 | }
|
---|
| 831 | }
|
---|
| 832 | }
|
---|
[821] | 833 | }
|
---|
[2725] | 834 | }
|
---|
| 835 | }
|
---|
| 836 |
|
---|
| 837 | static void start_jobs(void)
|
---|
| 838 | {
|
---|
| 839 | CronFile *file;
|
---|
| 840 | CronLine *line;
|
---|
| 841 |
|
---|
| 842 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 843 | if (!file->cf_wants_starting)
|
---|
| 844 | continue;
|
---|
| 845 |
|
---|
| 846 | file->cf_wants_starting = 0;
|
---|
| 847 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
| 848 | pid_t pid;
|
---|
| 849 | if (line->cl_pid >= 0)
|
---|
| 850 | continue;
|
---|
| 851 |
|
---|
| 852 | start_one_job(file->cf_username, line);
|
---|
| 853 | pid = line->cl_pid;
|
---|
[3621] | 854 | log8("USER %s pid %3d cmd %s",
|
---|
[2725] | 855 | file->cf_username, (int)pid, line->cl_cmd);
|
---|
| 856 | if (pid < 0) {
|
---|
| 857 | file->cf_wants_starting = 1;
|
---|
| 858 | }
|
---|
| 859 | if (pid > 0) {
|
---|
| 860 | file->cf_has_running = 1;
|
---|
| 861 | }
|
---|
[821] | 862 | }
|
---|
[2725] | 863 | }
|
---|
| 864 | }
|
---|
[821] | 865 |
|
---|
[2725] | 866 | /*
|
---|
| 867 | * Check for job completion, return number of jobs still running after
|
---|
| 868 | * all done.
|
---|
| 869 | */
|
---|
| 870 | static int check_completions(void)
|
---|
| 871 | {
|
---|
| 872 | CronFile *file;
|
---|
| 873 | CronLine *line;
|
---|
| 874 | int num_still_running = 0;
|
---|
| 875 |
|
---|
| 876 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 877 | if (!file->cf_has_running)
|
---|
| 878 | continue;
|
---|
| 879 |
|
---|
| 880 | file->cf_has_running = 0;
|
---|
| 881 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
| 882 | int r;
|
---|
| 883 |
|
---|
| 884 | if (line->cl_pid <= 0)
|
---|
| 885 | continue;
|
---|
| 886 |
|
---|
| 887 | r = waitpid(line->cl_pid, NULL, WNOHANG);
|
---|
| 888 | if (r < 0 || r == line->cl_pid) {
|
---|
| 889 | process_finished_job(file->cf_username, line);
|
---|
| 890 | if (line->cl_pid == 0) {
|
---|
| 891 | /* sendmail was not started for it */
|
---|
| 892 | continue;
|
---|
| 893 | }
|
---|
| 894 | /* else: sendmail was started, job is still running, fall thru */
|
---|
| 895 | }
|
---|
| 896 | /* else: r == 0: "process is still running" */
|
---|
| 897 | file->cf_has_running = 1;
|
---|
| 898 | }
|
---|
| 899 | //FIXME: if !file->cf_has_running && file->deleted: delete it!
|
---|
| 900 | //otherwise deleted entries will stay forever, right?
|
---|
| 901 | num_still_running += file->cf_has_running;
|
---|
[821] | 902 | }
|
---|
[2725] | 903 | return num_still_running;
|
---|
[821] | 904 | }
|
---|
[2725] | 905 |
|
---|
[3621] | 906 | static void reopen_logfile_to_stderr(void)
|
---|
| 907 | {
|
---|
| 908 | if (G.log_filename) {
|
---|
| 909 | int logfd = open_or_warn(G.log_filename, O_WRONLY | O_CREAT | O_APPEND);
|
---|
| 910 | if (logfd >= 0)
|
---|
| 911 | xmove_fd(logfd, STDERR_FILENO);
|
---|
| 912 | }
|
---|
| 913 | }
|
---|
| 914 |
|
---|
[2725] | 915 | int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 916 | int crond_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 917 | {
|
---|
| 918 | time_t t2;
|
---|
[3621] | 919 | unsigned rescan;
|
---|
| 920 | unsigned sleep_time;
|
---|
[2725] | 921 | unsigned opts;
|
---|
| 922 |
|
---|
| 923 | INIT_G();
|
---|
| 924 |
|
---|
| 925 | /* "-b after -f is ignored", and so on for every pair a-b */
|
---|
| 926 | opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
|
---|
[3232] | 927 | /* -l and -d have numeric param */
|
---|
| 928 | ":l+" IF_FEATURE_CROND_D(":d+");
|
---|
[2725] | 929 | opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
|
---|
| 930 | &G.log_level, &G.log_filename, &G.crontab_dir_name
|
---|
| 931 | IF_FEATURE_CROND_D(,&G.log_level));
|
---|
| 932 | /* both -d N and -l N set the same variable: G.log_level */
|
---|
| 933 |
|
---|
| 934 | if (!(opts & OPT_f)) {
|
---|
| 935 | /* close stdin, stdout, stderr.
|
---|
| 936 | * close unused descriptors - don't need them. */
|
---|
| 937 | bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
|
---|
| 938 | }
|
---|
| 939 |
|
---|
| 940 | if (!(opts & OPT_d) && G.log_filename == NULL) {
|
---|
| 941 | /* logging to syslog */
|
---|
| 942 | openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
|
---|
| 943 | logmode = LOGMODE_SYSLOG;
|
---|
| 944 | }
|
---|
| 945 |
|
---|
[3621] | 946 | //signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
|
---|
| 947 |
|
---|
| 948 | reopen_logfile_to_stderr();
|
---|
[2725] | 949 | xchdir(G.crontab_dir_name);
|
---|
[3621] | 950 | log8("crond (busybox "BB_VER") started, log level %d", G.log_level);
|
---|
[2725] | 951 | rescan_crontab_dir();
|
---|
[3232] | 952 | write_pidfile(CONFIG_PID_FILE_PATH "/crond.pid");
|
---|
[2725] | 953 |
|
---|
| 954 | /* Main loop */
|
---|
| 955 | t2 = time(NULL);
|
---|
| 956 | rescan = 60;
|
---|
| 957 | sleep_time = 60;
|
---|
| 958 | for (;;) {
|
---|
| 959 | struct stat sbuf;
|
---|
| 960 | time_t t1;
|
---|
| 961 | long dt;
|
---|
| 962 |
|
---|
[3621] | 963 | /* Synchronize to 1 minute, minimum 1 second */
|
---|
[2725] | 964 | t1 = t2;
|
---|
[3621] | 965 | sleep(sleep_time - (time(NULL) % sleep_time));
|
---|
[2725] | 966 | t2 = time(NULL);
|
---|
| 967 | dt = (long)t2 - (long)t1;
|
---|
| 968 |
|
---|
[3621] | 969 | reopen_logfile_to_stderr();
|
---|
| 970 |
|
---|
[2725] | 971 | /*
|
---|
| 972 | * The file 'cron.update' is checked to determine new cron
|
---|
| 973 | * jobs. The directory is rescanned once an hour to deal
|
---|
| 974 | * with any screwups.
|
---|
| 975 | *
|
---|
| 976 | * Check for time jump. Disparities over an hour either way
|
---|
| 977 | * result in resynchronization. A negative disparity
|
---|
| 978 | * less than an hour causes us to effectively sleep until we
|
---|
| 979 | * match the original time (i.e. no re-execution of jobs that
|
---|
| 980 | * have just been run). A positive disparity less than
|
---|
| 981 | * an hour causes intermediate jobs to be run, but only once
|
---|
| 982 | * in the worst case.
|
---|
| 983 | *
|
---|
| 984 | * When running jobs, the inequality used is greater but not
|
---|
| 985 | * equal to t1, and less then or equal to t2.
|
---|
| 986 | */
|
---|
| 987 | if (stat(G.crontab_dir_name, &sbuf) != 0)
|
---|
| 988 | sbuf.st_mtime = 0; /* force update (once) if dir was deleted */
|
---|
| 989 | if (G.crontab_dir_mtime != sbuf.st_mtime) {
|
---|
| 990 | G.crontab_dir_mtime = sbuf.st_mtime;
|
---|
| 991 | rescan = 1;
|
---|
| 992 | }
|
---|
| 993 | if (--rescan == 0) {
|
---|
| 994 | rescan = 60;
|
---|
| 995 | rescan_crontab_dir();
|
---|
| 996 | }
|
---|
| 997 | process_cron_update_file();
|
---|
[3621] | 998 | log5("wakeup dt=%ld", dt);
|
---|
[2725] | 999 | if (dt < -60 * 60 || dt > 60 * 60) {
|
---|
[3621] | 1000 | bb_error_msg("time disparity of %ld minutes detected", dt / 60);
|
---|
[2725] | 1001 | /* and we do not run any jobs in this case */
|
---|
| 1002 | } else if (dt > 0) {
|
---|
| 1003 | /* Usual case: time advances forward, as expected */
|
---|
| 1004 | flag_starting_jobs(t1, t2);
|
---|
| 1005 | start_jobs();
|
---|
[3621] | 1006 | sleep_time = 60;
|
---|
[2725] | 1007 | if (check_completions() > 0) {
|
---|
| 1008 | /* some jobs are still running */
|
---|
| 1009 | sleep_time = 10;
|
---|
| 1010 | }
|
---|
| 1011 | }
|
---|
| 1012 | /* else: time jumped back, do not run any jobs */
|
---|
| 1013 | } /* for (;;) */
|
---|
| 1014 |
|
---|
| 1015 | return 0; /* not reached */
|
---|
| 1016 | }
|
---|