[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * crond -d[#] -c <crondir> -f -b
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| 4 | *
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| 5 | * run as root, but NOT setuid root
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| 6 | *
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| 7 | * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
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[1765] | 8 | * (version 2.3.2)
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[821] | 9 | * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
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| 10 | *
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[2725] | 11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 12 | */
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| 13 |
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[3232] | 14 | //usage:#define crond_trivial_usage
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| 15 | //usage: "-fbS -l N " IF_FEATURE_CROND_D("-d N ") "-L LOGFILE -c DIR"
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| 16 | //usage:#define crond_full_usage "\n\n"
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| 17 | //usage: " -f Foreground"
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| 18 | //usage: "\n -b Background (default)"
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| 19 | //usage: "\n -S Log to syslog (default)"
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| 20 | //usage: "\n -l Set log level. 0 is the most verbose, default 8"
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| 21 | //usage: IF_FEATURE_CROND_D(
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| 22 | //usage: "\n -d Set log level, log to stderr"
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| 23 | //usage: )
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| 24 | //usage: "\n -L Log to file"
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| 25 | //usage: "\n -c Working dir"
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| 26 |
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[1765] | 27 | #include "libbb.h"
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[2725] | 28 | #include <syslog.h>
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[821] | 29 |
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[2725] | 30 | /* glibc frees previous setenv'ed value when we do next setenv()
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| 31 | * of the same variable. uclibc does not do this! */
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| 32 | #if (defined(__GLIBC__) && !defined(__UCLIBC__)) /* || OTHER_SAFE_LIBC... */
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| 33 | # define SETENV_LEAKS 0
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| 34 | #else
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| 35 | # define SETENV_LEAKS 1
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[821] | 36 | #endif
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[2725] | 37 |
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| 38 |
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| 39 | #define TMPDIR CONFIG_FEATURE_CROND_DIR
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| 40 | #define CRONTABS CONFIG_FEATURE_CROND_DIR "/crontabs"
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[821] | 41 | #ifndef SENDMAIL
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[2725] | 42 | # define SENDMAIL "sendmail"
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[821] | 43 | #endif
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| 44 | #ifndef SENDMAIL_ARGS
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[2725] | 45 | # define SENDMAIL_ARGS "-ti"
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[821] | 46 | #endif
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| 47 | #ifndef CRONUPDATE
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[2725] | 48 | # define CRONUPDATE "cron.update"
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[821] | 49 | #endif
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| 50 | #ifndef MAXLINES
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[2725] | 51 | # define MAXLINES 256 /* max lines in non-root crontabs */
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[821] | 52 | #endif
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| 53 |
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[2725] | 54 |
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[821] | 55 | typedef struct CronFile {
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[2725] | 56 | struct CronFile *cf_next;
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| 57 | struct CronLine *cf_lines;
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| 58 | char *cf_username;
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| 59 | smallint cf_wants_starting; /* bool: one or more jobs ready */
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| 60 | smallint cf_has_running; /* bool: one or more jobs running */
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| 61 | smallint cf_deleted; /* marked for deletion (but still has running jobs) */
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[821] | 62 | } CronFile;
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| 63 |
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| 64 | typedef struct CronLine {
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[2725] | 65 | struct CronLine *cl_next;
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| 66 | char *cl_cmd; /* shell command */
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| 67 | pid_t cl_pid; /* >0:running, <0:needs to be started in this minute, 0:dormant */
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| 68 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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| 69 | int cl_empty_mail_size; /* size of mail header only, 0 if no mailfile */
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| 70 | char *cl_mailto; /* whom to mail results, may be NULL */
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| 71 | #endif
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| 72 | /* ordered by size, not in natural order. makes code smaller: */
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| 73 | char cl_Dow[7]; /* 0-6, beginning sunday */
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| 74 | char cl_Mons[12]; /* 0-11 */
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| 75 | char cl_Hrs[24]; /* 0-23 */
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| 76 | char cl_Days[32]; /* 1-31 */
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| 77 | char cl_Mins[60]; /* 0-59 */
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[821] | 78 | } CronLine;
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| 79 |
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| 80 |
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[2725] | 81 | #define DAEMON_UID 0
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[821] | 82 |
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[2725] | 83 |
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| 84 | enum {
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| 85 | OPT_l = (1 << 0),
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| 86 | OPT_L = (1 << 1),
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| 87 | OPT_f = (1 << 2),
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| 88 | OPT_b = (1 << 3),
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| 89 | OPT_S = (1 << 4),
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| 90 | OPT_c = (1 << 5),
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| 91 | OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D,
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| 92 | };
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| 93 | #if ENABLE_FEATURE_CROND_D
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| 94 | # define DebugOpt (option_mask32 & OPT_d)
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| 95 | #else
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| 96 | # define DebugOpt 0
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[821] | 97 | #endif
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| 98 |
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| 99 |
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[2725] | 100 | struct globals {
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| 101 | unsigned log_level; /* = 8; */
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| 102 | time_t crontab_dir_mtime;
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| 103 | const char *log_filename;
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| 104 | const char *crontab_dir_name; /* = CRONTABS; */
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| 105 | CronFile *cron_files;
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| 106 | #if SETENV_LEAKS
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| 107 | char *env_var_user;
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| 108 | char *env_var_home;
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[821] | 109 | #endif
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[2725] | 110 | } FIX_ALIASING;
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| 111 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 112 | #define INIT_G() do { \
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| 113 | G.log_level = 8; \
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| 114 | G.crontab_dir_name = CRONTABS; \
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| 115 | } while (0)
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[821] | 116 |
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| 117 |
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[2725] | 118 | /* 0 is the most verbose, default 8 */
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| 119 | #define LVL5 "\x05"
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| 120 | #define LVL7 "\x07"
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| 121 | #define LVL8 "\x08"
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| 122 | #define WARN9 "\x49"
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| 123 | #define DIE9 "\xc9"
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| 124 | /* level >= 20 is "error" */
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| 125 | #define ERR20 "\x14"
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[821] | 126 |
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[2725] | 127 | static void crondlog(const char *ctl, ...) __attribute__ ((format (printf, 1, 2)));
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[821] | 128 | static void crondlog(const char *ctl, ...)
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| 129 | {
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| 130 | va_list va;
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[2725] | 131 | int level = (ctl[0] & 0x1f);
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[821] | 132 |
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| 133 | va_start(va, ctl);
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[2725] | 134 | if (level >= (int)G.log_level) {
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| 135 | /* Debug mode: all to (non-redirected) stderr, */
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| 136 | /* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
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| 137 | if (!DebugOpt && G.log_filename) {
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| 138 | /* Otherwise (log to file): we reopen log file at every write: */
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| 139 | int logfd = open_or_warn(G.log_filename, O_WRONLY | O_CREAT | O_APPEND);
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| 140 | if (logfd >= 0)
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| 141 | xmove_fd(logfd, STDERR_FILENO);
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| 142 | }
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| 143 | /* When we log to syslog, level > 8 is logged at LOG_ERR
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| 144 | * syslog level, level <= 8 is logged at LOG_INFO. */
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| 145 | if (level > 8) {
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| 146 | bb_verror_msg(ctl + 1, va, /* strerr: */ NULL);
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[821] | 147 | } else {
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[2725] | 148 | char *msg = NULL;
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| 149 | vasprintf(&msg, ctl + 1, va);
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| 150 | bb_info_msg("%s: %s", applet_name, msg);
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| 151 | free(msg);
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[821] | 152 | }
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| 153 | }
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| 154 | va_end(va);
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[2725] | 155 | if (ctl[0] & 0x80)
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[821] | 156 | exit(20);
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| 157 | }
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| 158 |
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[1765] | 159 | static const char DowAry[] ALIGN1 =
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| 160 | "sun""mon""tue""wed""thu""fri""sat"
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| 161 | /* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
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| 162 | ;
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[821] | 163 |
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[1765] | 164 | static const char MonAry[] ALIGN1 =
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| 165 | "jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
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| 166 | /* "Jan""Feb""Mar""Apr""May""Jun""Jul""Aug""Sep""Oct""Nov""Dec" */
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| 167 | ;
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[821] | 168 |
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[2725] | 169 | static void ParseField(char *user, char *ary, int modvalue, int off,
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[1765] | 170 | const char *names, char *ptr)
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| 171 | /* 'names' is a pointer to a set of 3-char abbreviations */
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[821] | 172 | {
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| 173 | char *base = ptr;
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| 174 | int n1 = -1;
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| 175 | int n2 = -1;
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| 176 |
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[2725] | 177 | // this can't happen due to config_read()
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| 178 | /*if (base == NULL)
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| 179 | return;*/
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[821] | 180 |
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[2725] | 181 | while (1) {
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[821] | 182 | int skip = 0;
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| 183 |
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| 184 | /* Handle numeric digit or symbol or '*' */
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| 185 | if (*ptr == '*') {
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[2725] | 186 | n1 = 0; /* everything will be filled */
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[821] | 187 | n2 = modvalue - 1;
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| 188 | skip = 1;
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| 189 | ++ptr;
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[2725] | 190 | } else if (isdigit(*ptr)) {
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| 191 | char *endp;
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[821] | 192 | if (n1 < 0) {
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[2725] | 193 | n1 = strtol(ptr, &endp, 10) + off;
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[821] | 194 | } else {
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[2725] | 195 | n2 = strtol(ptr, &endp, 10) + off;
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[821] | 196 | }
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[2725] | 197 | ptr = endp; /* gcc likes temp var for &endp */
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[821] | 198 | skip = 1;
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| 199 | } else if (names) {
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| 200 | int i;
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| 201 |
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[1765] | 202 | for (i = 0; names[i]; i += 3) {
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| 203 | /* was using strncmp before... */
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| 204 | if (strncasecmp(ptr, &names[i], 3) == 0) {
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| 205 | ptr += 3;
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| 206 | if (n1 < 0) {
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| 207 | n1 = i / 3;
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| 208 | } else {
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| 209 | n2 = i / 3;
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| 210 | }
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| 211 | skip = 1;
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[821] | 212 | break;
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| 213 | }
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| 214 | }
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| 215 | }
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| 216 |
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| 217 | /* handle optional range '-' */
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| 218 | if (skip == 0) {
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[2725] | 219 | goto err;
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[821] | 220 | }
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| 221 | if (*ptr == '-' && n2 < 0) {
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| 222 | ++ptr;
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| 223 | continue;
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| 224 | }
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| 225 |
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| 226 | /*
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| 227 | * collapse single-value ranges, handle skipmark, and fill
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| 228 | * in the character array appropriately.
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| 229 | */
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| 230 | if (n2 < 0) {
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| 231 | n2 = n1;
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| 232 | }
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| 233 | if (*ptr == '/') {
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[2725] | 234 | char *endp;
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| 235 | skip = strtol(ptr + 1, &endp, 10);
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| 236 | ptr = endp; /* gcc likes temp var for &endp */
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[821] | 237 | }
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[2725] | 238 |
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[821] | 239 | /*
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| 240 | * fill array, using a failsafe is the easiest way to prevent
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| 241 | * an endless loop
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| 242 | */
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| 243 | {
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| 244 | int s0 = 1;
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| 245 | int failsafe = 1024;
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| 246 |
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| 247 | --n1;
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| 248 | do {
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| 249 | n1 = (n1 + 1) % modvalue;
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| 250 |
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| 251 | if (--s0 == 0) {
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| 252 | ary[n1 % modvalue] = 1;
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| 253 | s0 = skip;
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| 254 | }
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[2725] | 255 | if (--failsafe == 0) {
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| 256 | goto err;
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| 257 | }
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| 258 | } while (n1 != n2);
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[821] | 259 | }
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| 260 | if (*ptr != ',') {
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| 261 | break;
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| 262 | }
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| 263 | ++ptr;
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| 264 | n1 = -1;
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| 265 | n2 = -1;
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| 266 | }
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| 267 |
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[2725] | 268 | if (*ptr) {
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| 269 | err:
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| 270 | crondlog(WARN9 "user %s: parse error at %s", user, base);
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| 271 | return;
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[821] | 272 | }
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| 273 |
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[2725] | 274 | if (DebugOpt && (G.log_level <= 5)) { /* like LVL5 */
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| 275 | /* can't use crondlog, it inserts '\n' */
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[821] | 276 | int i;
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[2725] | 277 | for (i = 0; i < modvalue; ++i)
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| 278 | fprintf(stderr, "%d", (unsigned char)ary[i]);
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| 279 | bb_putchar_stderr('\n');
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[821] | 280 | }
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| 281 | }
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| 282 |
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[2725] | 283 | static void FixDayDow(CronLine *line)
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[821] | 284 | {
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[2725] | 285 | unsigned i;
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[821] | 286 | int weekUsed = 0;
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| 287 | int daysUsed = 0;
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| 288 |
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[2725] | 289 | for (i = 0; i < ARRAY_SIZE(line->cl_Dow); ++i) {
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[821] | 290 | if (line->cl_Dow[i] == 0) {
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| 291 | weekUsed = 1;
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| 292 | break;
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| 293 | }
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| 294 | }
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[2725] | 295 | for (i = 0; i < ARRAY_SIZE(line->cl_Days); ++i) {
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[821] | 296 | if (line->cl_Days[i] == 0) {
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| 297 | daysUsed = 1;
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| 298 | break;
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| 299 | }
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| 300 | }
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[2725] | 301 | if (weekUsed != daysUsed) {
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| 302 | if (weekUsed)
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| 303 | memset(line->cl_Days, 0, sizeof(line->cl_Days));
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| 304 | else /* daysUsed */
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| 305 | memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
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[821] | 306 | }
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| 307 | }
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| 308 |
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[2725] | 309 | /*
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| 310 | * delete_cronfile() - delete user database
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| 311 | *
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| 312 | * Note: multiple entries for same user may exist if we were unable to
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| 313 | * completely delete a database due to running processes.
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| 314 | */
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| 315 | //FIXME: we will start a new job even if the old job is running
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| 316 | //if crontab was reloaded: crond thinks that "new" job is different from "old"
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| 317 | //even if they are in fact completely the same. Example
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| 318 | //Crontab was:
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| 319 | // 0-59 * * * * job1
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| 320 | // 0-59 * * * * long_running_job2
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| 321 | //User edits crontab to:
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| 322 | // 0-59 * * * * job1_updated
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| 323 | // 0-59 * * * * long_running_job2
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| 324 | //Bug: crond can now start another long_running_job2 even if old one
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| 325 | //is still running.
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| 326 | //OTOH most other versions of cron do not wait for job termination anyway,
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| 327 | //they end up with multiple copies of jobs if they don't terminate soon enough.
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| 328 | static void delete_cronfile(const char *userName)
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| 329 | {
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| 330 | CronFile **pfile = &G.cron_files;
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| 331 | CronFile *file;
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[821] | 332 |
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[2725] | 333 | while ((file = *pfile) != NULL) {
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| 334 | if (strcmp(userName, file->cf_username) == 0) {
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| 335 | CronLine **pline = &file->cf_lines;
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| 336 | CronLine *line;
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[821] | 337 |
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[2725] | 338 | file->cf_has_running = 0;
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| 339 | file->cf_deleted = 1;
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[821] | 340 |
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[2725] | 341 | while ((line = *pline) != NULL) {
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| 342 | if (line->cl_pid > 0) {
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| 343 | file->cf_has_running = 1;
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| 344 | pline = &line->cl_next;
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| 345 | } else {
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| 346 | *pline = line->cl_next;
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| 347 | free(line->cl_cmd);
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| 348 | free(line);
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| 349 | }
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| 350 | }
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| 351 | if (file->cf_has_running == 0) {
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| 352 | *pfile = file->cf_next;
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| 353 | free(file->cf_username);
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| 354 | free(file);
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| 355 | continue;
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| 356 | }
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| 357 | }
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| 358 | pfile = &file->cf_next;
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[821] | 359 | }
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[2725] | 360 | }
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[821] | 361 |
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[2725] | 362 | static void load_crontab(const char *fileName)
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| 363 | {
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| 364 | struct parser_t *parser;
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| 365 | struct stat sbuf;
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| 366 | int maxLines;
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| 367 | char *tokens[6];
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| 368 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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| 369 | char *mailTo = NULL;
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| 370 | #endif
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[821] | 371 |
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[2725] | 372 | delete_cronfile(fileName);
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[821] | 373 |
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[2725] | 374 | if (!getpwnam(fileName)) {
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| 375 | crondlog(LVL7 "ignoring file '%s' (no such user)", fileName);
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| 376 | return;
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| 377 | }
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[821] | 378 |
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[2725] | 379 | parser = config_open(fileName);
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| 380 | if (!parser)
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| 381 | return;
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[821] | 382 |
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[2725] | 383 | maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES;
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[821] | 384 |
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[2725] | 385 | if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DAEMON_UID) {
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| 386 | CronFile *file = xzalloc(sizeof(CronFile));
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| 387 | CronLine **pline;
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| 388 | int n;
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[821] | 389 |
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[2725] | 390 | file->cf_username = xstrdup(fileName);
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| 391 | pline = &file->cf_lines;
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[821] | 392 |
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[2725] | 393 | while (1) {
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| 394 | CronLine *line;
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[821] | 395 |
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[2725] | 396 | if (!--maxLines)
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| 397 | break;
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| 398 | n = config_read(parser, tokens, 6, 1, "# \t", PARSE_NORMAL | PARSE_KEEP_COPY);
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| 399 | if (!n)
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| 400 | break;
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[821] | 401 |
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[2725] | 402 | if (DebugOpt)
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| 403 | crondlog(LVL5 "user:%s entry:%s", fileName, parser->data);
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[821] | 404 |
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[2725] | 405 | /* check if line is setting MAILTO= */
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| 406 | if (0 == strncmp(tokens[0], "MAILTO=", 7)) {
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| 407 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
| 408 | free(mailTo);
|
---|
| 409 | mailTo = (tokens[0][7]) ? xstrdup(&tokens[0][7]) : NULL;
|
---|
| 410 | #endif /* otherwise just ignore such lines */
|
---|
| 411 | continue;
|
---|
| 412 | }
|
---|
| 413 | /* check if a minimum of tokens is specified */
|
---|
| 414 | if (n < 6)
|
---|
| 415 | continue;
|
---|
| 416 | *pline = line = xzalloc(sizeof(*line));
|
---|
| 417 | /* parse date ranges */
|
---|
| 418 | ParseField(file->cf_username, line->cl_Mins, 60, 0, NULL, tokens[0]);
|
---|
| 419 | ParseField(file->cf_username, line->cl_Hrs, 24, 0, NULL, tokens[1]);
|
---|
| 420 | ParseField(file->cf_username, line->cl_Days, 32, 0, NULL, tokens[2]);
|
---|
| 421 | ParseField(file->cf_username, line->cl_Mons, 12, -1, MonAry, tokens[3]);
|
---|
| 422 | ParseField(file->cf_username, line->cl_Dow, 7, 0, DowAry, tokens[4]);
|
---|
| 423 | /*
|
---|
| 424 | * fix days and dow - if one is not "*" and the other
|
---|
| 425 | * is "*", the other is set to 0, and vise-versa
|
---|
| 426 | */
|
---|
| 427 | FixDayDow(line);
|
---|
| 428 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
| 429 | /* copy mailto (can be NULL) */
|
---|
| 430 | line->cl_mailto = xstrdup(mailTo);
|
---|
[821] | 431 | #endif
|
---|
[2725] | 432 | /* copy command */
|
---|
| 433 | line->cl_cmd = xstrdup(tokens[5]);
|
---|
| 434 | if (DebugOpt) {
|
---|
| 435 | crondlog(LVL5 " command:%s", tokens[5]);
|
---|
| 436 | }
|
---|
| 437 | pline = &line->cl_next;
|
---|
| 438 | //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]);
|
---|
| 439 | }
|
---|
| 440 | *pline = NULL;
|
---|
[821] | 441 |
|
---|
[2725] | 442 | file->cf_next = G.cron_files;
|
---|
| 443 | G.cron_files = file;
|
---|
[821] | 444 |
|
---|
[2725] | 445 | if (maxLines == 0) {
|
---|
| 446 | crondlog(WARN9 "user %s: too many lines", fileName);
|
---|
[821] | 447 | }
|
---|
| 448 | }
|
---|
[2725] | 449 | config_close(parser);
|
---|
[821] | 450 | }
|
---|
| 451 |
|
---|
[2725] | 452 | static void process_cron_update_file(void)
|
---|
[821] | 453 | {
|
---|
| 454 | FILE *fi;
|
---|
| 455 | char buf[256];
|
---|
| 456 |
|
---|
[2725] | 457 | fi = fopen_for_read(CRONUPDATE);
|
---|
[821] | 458 | if (fi != NULL) {
|
---|
[2725] | 459 | unlink(CRONUPDATE);
|
---|
[821] | 460 | while (fgets(buf, sizeof(buf), fi) != NULL) {
|
---|
[2725] | 461 | /* use first word only */
|
---|
| 462 | skip_non_whitespace(buf)[0] = '\0';
|
---|
| 463 | load_crontab(buf);
|
---|
[821] | 464 | }
|
---|
| 465 | fclose(fi);
|
---|
| 466 | }
|
---|
| 467 | }
|
---|
| 468 |
|
---|
[2725] | 469 | static void rescan_crontab_dir(void)
|
---|
[821] | 470 | {
|
---|
[2725] | 471 | CronFile *file;
|
---|
[821] | 472 |
|
---|
[2725] | 473 | /* Delete all files until we only have ones with running jobs (or none) */
|
---|
| 474 | again:
|
---|
| 475 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 476 | if (!file->cf_deleted) {
|
---|
| 477 | delete_cronfile(file->cf_username);
|
---|
| 478 | goto again;
|
---|
[821] | 479 | }
|
---|
| 480 | }
|
---|
| 481 |
|
---|
[2725] | 482 | /* Remove cron update file */
|
---|
| 483 | unlink(CRONUPDATE);
|
---|
| 484 | /* Re-chdir, in case directory was renamed & deleted */
|
---|
| 485 | if (chdir(G.crontab_dir_name) < 0) {
|
---|
| 486 | crondlog(DIE9 "chdir(%s)", G.crontab_dir_name);
|
---|
| 487 | }
|
---|
[821] | 488 |
|
---|
[2725] | 489 | /* Scan directory and add associated users */
|
---|
[821] | 490 | {
|
---|
| 491 | DIR *dir = opendir(".");
|
---|
| 492 | struct dirent *den;
|
---|
| 493 |
|
---|
[2725] | 494 | if (!dir)
|
---|
| 495 | crondlog(DIE9 "chdir(%s)", "."); /* exits */
|
---|
| 496 | while ((den = readdir(dir)) != NULL) {
|
---|
| 497 | if (strchr(den->d_name, '.') != NULL) {
|
---|
| 498 | continue;
|
---|
[821] | 499 | }
|
---|
[2725] | 500 | load_crontab(den->d_name);
|
---|
[821] | 501 | }
|
---|
[2725] | 502 | closedir(dir);
|
---|
[821] | 503 | }
|
---|
| 504 | }
|
---|
| 505 |
|
---|
[2725] | 506 | #if SETENV_LEAKS
|
---|
| 507 | /* We set environment *before* vfork (because we want to use vfork),
|
---|
| 508 | * so we cannot use setenv() - repeated calls to setenv() may leak memory!
|
---|
| 509 | * Using putenv(), and freeing memory after unsetenv() won't leak */
|
---|
| 510 | static void safe_setenv(char **pvar_val, const char *var, const char *val)
|
---|
[821] | 511 | {
|
---|
[2725] | 512 | char *var_val = *pvar_val;
|
---|
[821] | 513 |
|
---|
[2725] | 514 | if (var_val) {
|
---|
| 515 | bb_unsetenv_and_free(var_val);
|
---|
[821] | 516 | }
|
---|
[2725] | 517 | *pvar_val = xasprintf("%s=%s", var, val);
|
---|
| 518 | putenv(*pvar_val);
|
---|
[821] | 519 | }
|
---|
[2725] | 520 | #endif
|
---|
[821] | 521 |
|
---|
[2725] | 522 | static void set_env_vars(struct passwd *pas)
|
---|
[821] | 523 | {
|
---|
[2725] | 524 | #if SETENV_LEAKS
|
---|
| 525 | safe_setenv(&G.env_var_user, "USER", pas->pw_name);
|
---|
| 526 | safe_setenv(&G.env_var_home, "HOME", pas->pw_dir);
|
---|
| 527 | /* if we want to set user's shell instead: */
|
---|
| 528 | /*safe_setenv(G.env_var_shell, "SHELL", pas->pw_shell);*/
|
---|
| 529 | #else
|
---|
| 530 | xsetenv("USER", pas->pw_name);
|
---|
| 531 | xsetenv("HOME", pas->pw_dir);
|
---|
[821] | 532 | #endif
|
---|
[2725] | 533 | /* currently, we use constant one: */
|
---|
| 534 | /*setenv("SHELL", DEFAULT_SHELL, 1); - done earlier */
|
---|
[821] | 535 | }
|
---|
| 536 |
|
---|
[2725] | 537 | static void change_user(struct passwd *pas)
|
---|
[821] | 538 | {
|
---|
[2725] | 539 | /* careful: we're after vfork! */
|
---|
| 540 | change_identity(pas); /* - initgroups, setgid, setuid */
|
---|
| 541 | if (chdir(pas->pw_dir) < 0) {
|
---|
| 542 | crondlog(WARN9 "chdir(%s)", pas->pw_dir);
|
---|
| 543 | if (chdir(TMPDIR) < 0) {
|
---|
| 544 | crondlog(DIE9 "chdir(%s)", TMPDIR); /* exits */
|
---|
[821] | 545 | }
|
---|
| 546 | }
|
---|
| 547 | }
|
---|
| 548 |
|
---|
[2725] | 549 | // TODO: sendmail should be _run-time_ option, not compile-time!
|
---|
| 550 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
[821] | 551 |
|
---|
[2725] | 552 | static pid_t
|
---|
| 553 | fork_job(const char *user, int mailFd,
|
---|
| 554 | const char *prog,
|
---|
| 555 | const char *shell_cmd /* if NULL, we run sendmail */
|
---|
| 556 | ) {
|
---|
| 557 | struct passwd *pas;
|
---|
| 558 | pid_t pid;
|
---|
[821] | 559 |
|
---|
[2725] | 560 | /* prepare things before vfork */
|
---|
| 561 | pas = getpwnam(user);
|
---|
| 562 | if (!pas) {
|
---|
| 563 | crondlog(WARN9 "can't get uid for %s", user);
|
---|
| 564 | goto err;
|
---|
[821] | 565 | }
|
---|
[2725] | 566 | set_env_vars(pas);
|
---|
[821] | 567 |
|
---|
[2725] | 568 | pid = vfork();
|
---|
[821] | 569 | if (pid == 0) {
|
---|
| 570 | /* CHILD */
|
---|
[2725] | 571 | /* initgroups, setgid, setuid, and chdir to home or TMPDIR */
|
---|
| 572 | change_user(pas);
|
---|
[821] | 573 | if (DebugOpt) {
|
---|
[2725] | 574 | crondlog(LVL5 "child running %s", prog);
|
---|
[821] | 575 | }
|
---|
| 576 | if (mailFd >= 0) {
|
---|
[2725] | 577 | xmove_fd(mailFd, shell_cmd ? 1 : 0);
|
---|
| 578 | dup2(1, 2);
|
---|
[821] | 579 | }
|
---|
[2725] | 580 | /* crond 3.0pl1-100 puts tasks in separate process groups */
|
---|
| 581 | bb_setpgrp();
|
---|
| 582 | execlp(prog, prog, (shell_cmd ? "-c" : SENDMAIL_ARGS), shell_cmd, (char *) NULL);
|
---|
| 583 | crondlog(ERR20 "can't execute '%s' for user %s", prog, user);
|
---|
| 584 | if (shell_cmd) {
|
---|
| 585 | fdprintf(1, "Exec failed: %s -c %s\n", prog, shell_cmd);
|
---|
[821] | 586 | }
|
---|
[2725] | 587 | _exit(EXIT_SUCCESS);
|
---|
| 588 | }
|
---|
| 589 |
|
---|
| 590 | if (pid < 0) {
|
---|
[821] | 591 | /* FORK FAILED */
|
---|
[2725] | 592 | crondlog(ERR20 "can't vfork");
|
---|
| 593 | err:
|
---|
| 594 | pid = 0;
|
---|
| 595 | } /* else: PARENT, FORK SUCCESS */
|
---|
[821] | 596 |
|
---|
| 597 | /*
|
---|
| 598 | * Close the mail file descriptor.. we can't just leave it open in
|
---|
| 599 | * a structure, closing it later, because we might run out of descriptors
|
---|
| 600 | */
|
---|
| 601 | if (mailFd >= 0) {
|
---|
| 602 | close(mailFd);
|
---|
| 603 | }
|
---|
[2725] | 604 | return pid;
|
---|
[821] | 605 | }
|
---|
| 606 |
|
---|
[2725] | 607 | static void start_one_job(const char *user, CronLine *line)
|
---|
[821] | 608 | {
|
---|
| 609 | char mailFile[128];
|
---|
[2725] | 610 | int mailFd = -1;
|
---|
[821] | 611 |
|
---|
[2725] | 612 | line->cl_pid = 0;
|
---|
| 613 | line->cl_empty_mail_size = 0;
|
---|
[821] | 614 |
|
---|
[2725] | 615 | if (line->cl_mailto) {
|
---|
| 616 | /* Open mail file (owner is root so nobody can screw with it) */
|
---|
| 617 | snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, getpid());
|
---|
| 618 | mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
|
---|
[821] | 619 |
|
---|
[2725] | 620 | if (mailFd >= 0) {
|
---|
| 621 | fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", line->cl_mailto,
|
---|
| 622 | line->cl_cmd);
|
---|
| 623 | line->cl_empty_mail_size = lseek(mailFd, 0, SEEK_CUR);
|
---|
| 624 | } else {
|
---|
| 625 | crondlog(ERR20 "can't create mail file %s for user %s, "
|
---|
| 626 | "discarding output", mailFile, user);
|
---|
| 627 | }
|
---|
| 628 | }
|
---|
[821] | 629 |
|
---|
[2725] | 630 | line->cl_pid = fork_job(user, mailFd, DEFAULT_SHELL, line->cl_cmd);
|
---|
[821] | 631 | if (mailFd >= 0) {
|
---|
[2725] | 632 | if (line->cl_pid <= 0) {
|
---|
| 633 | unlink(mailFile);
|
---|
| 634 | } else {
|
---|
| 635 | /* rename mail-file based on pid of process */
|
---|
| 636 | char *mailFile2 = xasprintf("%s/cron.%s.%d", TMPDIR, user, (int)line->cl_pid);
|
---|
| 637 | rename(mailFile, mailFile2); // TODO: xrename?
|
---|
| 638 | free(mailFile2);
|
---|
| 639 | }
|
---|
[821] | 640 | }
|
---|
| 641 | }
|
---|
| 642 |
|
---|
| 643 | /*
|
---|
[2725] | 644 | * process_finished_job - called when job terminates and when mail terminates
|
---|
[821] | 645 | */
|
---|
[2725] | 646 | static void process_finished_job(const char *user, CronLine *line)
|
---|
[821] | 647 | {
|
---|
[2725] | 648 | pid_t pid;
|
---|
[821] | 649 | int mailFd;
|
---|
| 650 | char mailFile[128];
|
---|
| 651 | struct stat sbuf;
|
---|
| 652 |
|
---|
[2725] | 653 | pid = line->cl_pid;
|
---|
| 654 | line->cl_pid = 0;
|
---|
| 655 | if (pid <= 0) {
|
---|
| 656 | /* No job */
|
---|
[821] | 657 | return;
|
---|
| 658 | }
|
---|
[2725] | 659 | if (line->cl_empty_mail_size <= 0) {
|
---|
| 660 | /* End of job and no mail file, or end of sendmail job */
|
---|
[821] | 661 | return;
|
---|
| 662 | }
|
---|
| 663 |
|
---|
| 664 | /*
|
---|
[2725] | 665 | * End of primary job - check for mail file.
|
---|
| 666 | * If size has changed and the file is still valid, we send it.
|
---|
[821] | 667 | */
|
---|
[2725] | 668 | snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, (int)pid);
|
---|
[821] | 669 | mailFd = open(mailFile, O_RDONLY);
|
---|
[2725] | 670 | unlink(mailFile);
|
---|
[821] | 671 | if (mailFd < 0) {
|
---|
| 672 | return;
|
---|
| 673 | }
|
---|
| 674 |
|
---|
[2725] | 675 | if (fstat(mailFd, &sbuf) < 0
|
---|
| 676 | || sbuf.st_uid != DAEMON_UID
|
---|
| 677 | || sbuf.st_nlink != 0
|
---|
| 678 | || sbuf.st_size == line->cl_empty_mail_size
|
---|
[1765] | 679 | || !S_ISREG(sbuf.st_mode)
|
---|
| 680 | ) {
|
---|
[821] | 681 | close(mailFd);
|
---|
| 682 | return;
|
---|
| 683 | }
|
---|
[2725] | 684 | line->cl_empty_mail_size = 0;
|
---|
| 685 | /* if (line->cl_mailto) - always true if cl_empty_mail_size was nonzero */
|
---|
| 686 | line->cl_pid = fork_job(user, mailFd, SENDMAIL, NULL);
|
---|
[821] | 687 | }
|
---|
| 688 |
|
---|
[2725] | 689 | #else /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|
| 690 |
|
---|
| 691 | static void start_one_job(const char *user, CronLine *line)
|
---|
[821] | 692 | {
|
---|
[2725] | 693 | struct passwd *pas;
|
---|
| 694 | pid_t pid;
|
---|
| 695 |
|
---|
| 696 | pas = getpwnam(user);
|
---|
| 697 | if (!pas) {
|
---|
| 698 | crondlog(WARN9 "can't get uid for %s", user);
|
---|
| 699 | goto err;
|
---|
| 700 | }
|
---|
| 701 |
|
---|
| 702 | /* Prepare things before vfork */
|
---|
| 703 | set_env_vars(pas);
|
---|
| 704 |
|
---|
[821] | 705 | /* Fork as the user in question and run program */
|
---|
[2725] | 706 | pid = vfork();
|
---|
[821] | 707 | if (pid == 0) {
|
---|
| 708 | /* CHILD */
|
---|
[2725] | 709 | /* initgroups, setgid, setuid, and chdir to home or TMPDIR */
|
---|
| 710 | change_user(pas);
|
---|
| 711 | if (DebugOpt) {
|
---|
| 712 | crondlog(LVL5 "child running %s", DEFAULT_SHELL);
|
---|
| 713 | }
|
---|
| 714 | /* crond 3.0pl1-100 puts tasks in separate process groups */
|
---|
| 715 | bb_setpgrp();
|
---|
| 716 | execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_cmd, (char *) NULL);
|
---|
| 717 | crondlog(ERR20 "can't execute '%s' for user %s", DEFAULT_SHELL, user);
|
---|
| 718 | _exit(EXIT_SUCCESS);
|
---|
| 719 | }
|
---|
| 720 | if (pid < 0) {
|
---|
| 721 | /* FORK FAILED */
|
---|
| 722 | crondlog(ERR20 "can't vfork");
|
---|
| 723 | err:
|
---|
| 724 | pid = 0;
|
---|
| 725 | }
|
---|
| 726 | line->cl_pid = pid;
|
---|
| 727 | }
|
---|
[821] | 728 |
|
---|
[2725] | 729 | #define process_finished_job(user, line) ((line)->cl_pid = 0)
|
---|
[821] | 730 |
|
---|
[2725] | 731 | #endif /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|
| 732 |
|
---|
| 733 | /*
|
---|
| 734 | * Determine which jobs need to be run. Under normal conditions, the
|
---|
| 735 | * period is about a minute (one scan). Worst case it will be one
|
---|
| 736 | * hour (60 scans).
|
---|
| 737 | */
|
---|
| 738 | static void flag_starting_jobs(time_t t1, time_t t2)
|
---|
| 739 | {
|
---|
| 740 | time_t t;
|
---|
| 741 |
|
---|
| 742 | /* Find jobs > t1 and <= t2 */
|
---|
| 743 |
|
---|
| 744 | for (t = t1 - t1 % 60; t <= t2; t += 60) {
|
---|
| 745 | struct tm *ptm;
|
---|
| 746 | CronFile *file;
|
---|
| 747 | CronLine *line;
|
---|
| 748 |
|
---|
| 749 | if (t <= t1)
|
---|
| 750 | continue;
|
---|
| 751 |
|
---|
| 752 | ptm = localtime(&t);
|
---|
| 753 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 754 | if (DebugOpt)
|
---|
| 755 | crondlog(LVL5 "file %s:", file->cf_username);
|
---|
| 756 | if (file->cf_deleted)
|
---|
| 757 | continue;
|
---|
| 758 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
| 759 | if (DebugOpt)
|
---|
| 760 | crondlog(LVL5 " line %s", line->cl_cmd);
|
---|
| 761 | if (line->cl_Mins[ptm->tm_min]
|
---|
| 762 | && line->cl_Hrs[ptm->tm_hour]
|
---|
| 763 | && (line->cl_Days[ptm->tm_mday] || line->cl_Dow[ptm->tm_wday])
|
---|
| 764 | && line->cl_Mons[ptm->tm_mon]
|
---|
| 765 | ) {
|
---|
| 766 | if (DebugOpt) {
|
---|
| 767 | crondlog(LVL5 " job: %d %s",
|
---|
| 768 | (int)line->cl_pid, line->cl_cmd);
|
---|
| 769 | }
|
---|
| 770 | if (line->cl_pid > 0) {
|
---|
| 771 | crondlog(LVL8 "user %s: process already running: %s",
|
---|
| 772 | file->cf_username, line->cl_cmd);
|
---|
| 773 | } else if (line->cl_pid == 0) {
|
---|
| 774 | line->cl_pid = -1;
|
---|
| 775 | file->cf_wants_starting = 1;
|
---|
| 776 | }
|
---|
| 777 | }
|
---|
| 778 | }
|
---|
[821] | 779 | }
|
---|
[2725] | 780 | }
|
---|
| 781 | }
|
---|
| 782 |
|
---|
| 783 | static void start_jobs(void)
|
---|
| 784 | {
|
---|
| 785 | CronFile *file;
|
---|
| 786 | CronLine *line;
|
---|
| 787 |
|
---|
| 788 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 789 | if (!file->cf_wants_starting)
|
---|
| 790 | continue;
|
---|
| 791 |
|
---|
| 792 | file->cf_wants_starting = 0;
|
---|
| 793 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
| 794 | pid_t pid;
|
---|
| 795 | if (line->cl_pid >= 0)
|
---|
| 796 | continue;
|
---|
| 797 |
|
---|
| 798 | start_one_job(file->cf_username, line);
|
---|
| 799 | pid = line->cl_pid;
|
---|
| 800 | crondlog(LVL8 "USER %s pid %3d cmd %s",
|
---|
| 801 | file->cf_username, (int)pid, line->cl_cmd);
|
---|
| 802 | if (pid < 0) {
|
---|
| 803 | file->cf_wants_starting = 1;
|
---|
| 804 | }
|
---|
| 805 | if (pid > 0) {
|
---|
| 806 | file->cf_has_running = 1;
|
---|
| 807 | }
|
---|
[821] | 808 | }
|
---|
[2725] | 809 | }
|
---|
| 810 | }
|
---|
[821] | 811 |
|
---|
[2725] | 812 | /*
|
---|
| 813 | * Check for job completion, return number of jobs still running after
|
---|
| 814 | * all done.
|
---|
| 815 | */
|
---|
| 816 | static int check_completions(void)
|
---|
| 817 | {
|
---|
| 818 | CronFile *file;
|
---|
| 819 | CronLine *line;
|
---|
| 820 | int num_still_running = 0;
|
---|
| 821 |
|
---|
| 822 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 823 | if (!file->cf_has_running)
|
---|
| 824 | continue;
|
---|
| 825 |
|
---|
| 826 | file->cf_has_running = 0;
|
---|
| 827 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
| 828 | int r;
|
---|
| 829 |
|
---|
| 830 | if (line->cl_pid <= 0)
|
---|
| 831 | continue;
|
---|
| 832 |
|
---|
| 833 | r = waitpid(line->cl_pid, NULL, WNOHANG);
|
---|
| 834 | if (r < 0 || r == line->cl_pid) {
|
---|
| 835 | process_finished_job(file->cf_username, line);
|
---|
| 836 | if (line->cl_pid == 0) {
|
---|
| 837 | /* sendmail was not started for it */
|
---|
| 838 | continue;
|
---|
| 839 | }
|
---|
| 840 | /* else: sendmail was started, job is still running, fall thru */
|
---|
| 841 | }
|
---|
| 842 | /* else: r == 0: "process is still running" */
|
---|
| 843 | file->cf_has_running = 1;
|
---|
| 844 | }
|
---|
| 845 | //FIXME: if !file->cf_has_running && file->deleted: delete it!
|
---|
| 846 | //otherwise deleted entries will stay forever, right?
|
---|
| 847 | num_still_running += file->cf_has_running;
|
---|
[821] | 848 | }
|
---|
[2725] | 849 | return num_still_running;
|
---|
[821] | 850 | }
|
---|
[2725] | 851 |
|
---|
| 852 | int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 853 | int crond_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 854 | {
|
---|
| 855 | time_t t2;
|
---|
| 856 | int rescan;
|
---|
| 857 | int sleep_time;
|
---|
| 858 | unsigned opts;
|
---|
| 859 |
|
---|
| 860 | INIT_G();
|
---|
| 861 |
|
---|
| 862 | /* "-b after -f is ignored", and so on for every pair a-b */
|
---|
| 863 | opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
|
---|
[3232] | 864 | /* -l and -d have numeric param */
|
---|
| 865 | ":l+" IF_FEATURE_CROND_D(":d+");
|
---|
[2725] | 866 | opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
|
---|
| 867 | &G.log_level, &G.log_filename, &G.crontab_dir_name
|
---|
| 868 | IF_FEATURE_CROND_D(,&G.log_level));
|
---|
| 869 | /* both -d N and -l N set the same variable: G.log_level */
|
---|
| 870 |
|
---|
| 871 | if (!(opts & OPT_f)) {
|
---|
| 872 | /* close stdin, stdout, stderr.
|
---|
| 873 | * close unused descriptors - don't need them. */
|
---|
| 874 | bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
|
---|
| 875 | }
|
---|
| 876 |
|
---|
| 877 | if (!(opts & OPT_d) && G.log_filename == NULL) {
|
---|
| 878 | /* logging to syslog */
|
---|
| 879 | openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
|
---|
| 880 | logmode = LOGMODE_SYSLOG;
|
---|
| 881 | }
|
---|
| 882 |
|
---|
| 883 | xchdir(G.crontab_dir_name);
|
---|
| 884 | //signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
|
---|
| 885 | xsetenv("SHELL", DEFAULT_SHELL); /* once, for all future children */
|
---|
| 886 | crondlog(LVL8 "crond (busybox "BB_VER") started, log level %d", G.log_level);
|
---|
| 887 | rescan_crontab_dir();
|
---|
[3232] | 888 | write_pidfile(CONFIG_PID_FILE_PATH "/crond.pid");
|
---|
[2725] | 889 |
|
---|
| 890 | /* Main loop */
|
---|
| 891 | t2 = time(NULL);
|
---|
| 892 | rescan = 60;
|
---|
| 893 | sleep_time = 60;
|
---|
| 894 | for (;;) {
|
---|
| 895 | struct stat sbuf;
|
---|
| 896 | time_t t1;
|
---|
| 897 | long dt;
|
---|
| 898 |
|
---|
| 899 | t1 = t2;
|
---|
| 900 |
|
---|
| 901 | /* Synchronize to 1 minute, minimum 1 second */
|
---|
| 902 | sleep(sleep_time - (time(NULL) % sleep_time) + 1);
|
---|
| 903 |
|
---|
| 904 | t2 = time(NULL);
|
---|
| 905 | dt = (long)t2 - (long)t1;
|
---|
| 906 |
|
---|
| 907 | /*
|
---|
| 908 | * The file 'cron.update' is checked to determine new cron
|
---|
| 909 | * jobs. The directory is rescanned once an hour to deal
|
---|
| 910 | * with any screwups.
|
---|
| 911 | *
|
---|
| 912 | * Check for time jump. Disparities over an hour either way
|
---|
| 913 | * result in resynchronization. A negative disparity
|
---|
| 914 | * less than an hour causes us to effectively sleep until we
|
---|
| 915 | * match the original time (i.e. no re-execution of jobs that
|
---|
| 916 | * have just been run). A positive disparity less than
|
---|
| 917 | * an hour causes intermediate jobs to be run, but only once
|
---|
| 918 | * in the worst case.
|
---|
| 919 | *
|
---|
| 920 | * When running jobs, the inequality used is greater but not
|
---|
| 921 | * equal to t1, and less then or equal to t2.
|
---|
| 922 | */
|
---|
| 923 | if (stat(G.crontab_dir_name, &sbuf) != 0)
|
---|
| 924 | sbuf.st_mtime = 0; /* force update (once) if dir was deleted */
|
---|
| 925 | if (G.crontab_dir_mtime != sbuf.st_mtime) {
|
---|
| 926 | G.crontab_dir_mtime = sbuf.st_mtime;
|
---|
| 927 | rescan = 1;
|
---|
| 928 | }
|
---|
| 929 | if (--rescan == 0) {
|
---|
| 930 | rescan = 60;
|
---|
| 931 | rescan_crontab_dir();
|
---|
| 932 | }
|
---|
| 933 | process_cron_update_file();
|
---|
| 934 | if (DebugOpt)
|
---|
| 935 | crondlog(LVL5 "wakeup dt=%ld", dt);
|
---|
| 936 | if (dt < -60 * 60 || dt > 60 * 60) {
|
---|
| 937 | crondlog(WARN9 "time disparity of %ld minutes detected", dt / 60);
|
---|
| 938 | /* and we do not run any jobs in this case */
|
---|
| 939 | } else if (dt > 0) {
|
---|
| 940 | /* Usual case: time advances forward, as expected */
|
---|
| 941 | flag_starting_jobs(t1, t2);
|
---|
| 942 | start_jobs();
|
---|
| 943 | if (check_completions() > 0) {
|
---|
| 944 | /* some jobs are still running */
|
---|
| 945 | sleep_time = 10;
|
---|
| 946 | } else {
|
---|
| 947 | sleep_time = 60;
|
---|
| 948 | }
|
---|
| 949 | }
|
---|
| 950 | /* else: time jumped back, do not run any jobs */
|
---|
| 951 | } /* for (;;) */
|
---|
| 952 |
|
---|
| 953 | return 0; /* not reached */
|
---|
| 954 | }
|
---|