[3320] | 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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| 8 | * (version 2.3.2)
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| 9 | * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
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| 10 | *
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| 11 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 12 | */
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| 13 |
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| 14 | #include "libbb.h"
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| 15 | #include <syslog.h>
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| 16 |
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| 17 | /* glibc frees previous setenv'ed value when we do next setenv()
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| 18 | * of the same variable. uclibc does not do this! */
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| 19 | #if (defined(__GLIBC__) && !defined(__UCLIBC__)) /* || OTHER_SAFE_LIBC... */
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| 20 | # define SETENV_LEAKS 0
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| 21 | #else
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| 22 | # define SETENV_LEAKS 1
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| 23 | #endif
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| 24 |
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| 25 |
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| 26 | #define TMPDIR CONFIG_FEATURE_CROND_DIR
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| 27 | #define CRONTABS CONFIG_FEATURE_CROND_DIR "/crontabs"
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| 28 | #ifndef SENDMAIL
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| 29 | # define SENDMAIL "sendmail"
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| 30 | #endif
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| 31 | #ifndef SENDMAIL_ARGS
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| 32 | # define SENDMAIL_ARGS "-ti"
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| 33 | #endif
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| 34 | #ifndef CRONUPDATE
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| 35 | # define CRONUPDATE "cron.update"
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| 36 | #endif
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| 37 | #ifndef MAXLINES
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| 38 | # define MAXLINES 256 /* max lines in non-root crontabs */
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| 39 | #endif
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| 40 |
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| 41 |
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| 42 | typedef struct CronFile {
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| 43 | struct CronFile *cf_next;
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| 44 | struct CronLine *cf_lines;
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| 45 | char *cf_username;
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| 46 | smallint cf_wants_starting; /* bool: one or more jobs ready */
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| 47 | smallint cf_has_running; /* bool: one or more jobs running */
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| 48 | smallint cf_deleted; /* marked for deletion (but still has running jobs) */
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| 49 | } CronFile;
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| 50 |
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| 51 | typedef struct CronLine {
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| 52 | struct CronLine *cl_next;
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| 53 | char *cl_cmd; /* shell command */
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| 54 | pid_t cl_pid; /* >0:running, <0:needs to be started in this minute, 0:dormant */
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| 55 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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| 56 | int cl_empty_mail_size; /* size of mail header only, 0 if no mailfile */
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| 57 | char *cl_mailto; /* whom to mail results, may be NULL */
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| 58 | #endif
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| 59 | /* ordered by size, not in natural order. makes code smaller: */
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| 60 | char cl_Dow[7]; /* 0-6, beginning sunday */
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| 61 | char cl_Mons[12]; /* 0-11 */
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| 62 | char cl_Hrs[24]; /* 0-23 */
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| 63 | char cl_Days[32]; /* 1-31 */
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| 64 | char cl_Mins[60]; /* 0-59 */
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| 65 | } CronLine;
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| 66 |
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| 67 |
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| 68 | #define DAEMON_UID 0
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| 69 |
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| 70 |
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| 71 | enum {
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| 72 | OPT_l = (1 << 0),
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| 73 | OPT_L = (1 << 1),
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| 74 | OPT_f = (1 << 2),
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| 75 | OPT_b = (1 << 3),
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| 76 | OPT_S = (1 << 4),
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| 77 | OPT_c = (1 << 5),
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| 78 | OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D,
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| 79 | };
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| 80 | #if ENABLE_FEATURE_CROND_D
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| 81 | # define DebugOpt (option_mask32 & OPT_d)
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| 82 | #else
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| 83 | # define DebugOpt 0
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| 84 | #endif
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| 85 |
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| 86 |
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| 87 | struct globals {
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| 88 | unsigned log_level; /* = 8; */
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| 89 | time_t crontab_dir_mtime;
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| 90 | const char *log_filename;
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| 91 | const char *crontab_dir_name; /* = CRONTABS; */
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| 92 | CronFile *cron_files;
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| 93 | #if SETENV_LEAKS
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| 94 | char *env_var_user;
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| 95 | char *env_var_home;
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| 96 | #endif
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| 97 | } FIX_ALIASING;
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| 98 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 99 | #define INIT_G() do { \
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| 100 | G.log_level = 8; \
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| 101 | G.crontab_dir_name = CRONTABS; \
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| 102 | } while (0)
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| 103 |
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| 104 |
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| 105 | /* 0 is the most verbose, default 8 */
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| 106 | #define LVL5 "\x05"
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| 107 | #define LVL7 "\x07"
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| 108 | #define LVL8 "\x08"
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| 109 | #define WARN9 "\x49"
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| 110 | #define DIE9 "\xc9"
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| 111 | /* level >= 20 is "error" */
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| 112 | #define ERR20 "\x14"
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| 113 |
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| 114 | static void crondlog(const char *ctl, ...) __attribute__ ((format (printf, 1, 2)));
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| 115 | static void crondlog(const char *ctl, ...)
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| 116 | {
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| 117 | va_list va;
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| 118 | int level = (ctl[0] & 0x1f);
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| 119 |
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| 120 | va_start(va, ctl);
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| 121 | if (level >= (int)G.log_level) {
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| 122 | /* Debug mode: all to (non-redirected) stderr, */
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| 123 | /* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
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| 124 | if (!DebugOpt && G.log_filename) {
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| 125 | /* Otherwise (log to file): we reopen log file at every write: */
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| 126 | int logfd = open_or_warn(G.log_filename, O_WRONLY | O_CREAT | O_APPEND);
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| 127 | if (logfd >= 0)
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| 128 | xmove_fd(logfd, STDERR_FILENO);
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| 129 | }
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| 130 | /* When we log to syslog, level > 8 is logged at LOG_ERR
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| 131 | * syslog level, level <= 8 is logged at LOG_INFO. */
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| 132 | if (level > 8) {
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| 133 | bb_verror_msg(ctl + 1, va, /* strerr: */ NULL);
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| 134 | } else {
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| 135 | char *msg = NULL;
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| 136 | vasprintf(&msg, ctl + 1, va);
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| 137 | bb_info_msg("%s: %s", applet_name, msg);
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| 138 | free(msg);
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| 139 | }
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| 140 | }
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| 141 | va_end(va);
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| 142 | if (ctl[0] & 0x80)
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| 143 | exit(20);
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| 144 | }
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| 145 |
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| 146 | static const char DowAry[] ALIGN1 =
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| 147 | "sun""mon""tue""wed""thu""fri""sat"
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| 148 | /* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
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| 149 | ;
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| 150 |
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| 151 | static const char MonAry[] ALIGN1 =
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| 152 | "jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
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| 153 | /* "Jan""Feb""Mar""Apr""May""Jun""Jul""Aug""Sep""Oct""Nov""Dec" */
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| 154 | ;
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| 155 |
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| 156 | static void ParseField(char *user, char *ary, int modvalue, int off,
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| 157 | const char *names, char *ptr)
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| 158 | /* 'names' is a pointer to a set of 3-char abbreviations */
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| 159 | {
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| 160 | char *base = ptr;
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| 161 | int n1 = -1;
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| 162 | int n2 = -1;
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| 163 |
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| 164 | // this can't happen due to config_read()
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| 165 | /*if (base == NULL)
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| 166 | return;*/
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| 167 |
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| 168 | while (1) {
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| 169 | int skip = 0;
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| 170 |
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| 171 | /* Handle numeric digit or symbol or '*' */
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| 172 | if (*ptr == '*') {
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| 173 | n1 = 0; /* everything will be filled */
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| 174 | n2 = modvalue - 1;
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| 175 | skip = 1;
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| 176 | ++ptr;
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| 177 | } else if (isdigit(*ptr)) {
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| 178 | char *endp;
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| 179 | if (n1 < 0) {
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| 180 | n1 = strtol(ptr, &endp, 10) + off;
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| 181 | } else {
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| 182 | n2 = strtol(ptr, &endp, 10) + off;
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| 183 | }
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| 184 | ptr = endp; /* gcc likes temp var for &endp */
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| 185 | skip = 1;
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| 186 | } else if (names) {
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| 187 | int i;
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| 188 |
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| 189 | for (i = 0; names[i]; i += 3) {
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| 190 | /* was using strncmp before... */
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| 191 | if (strncasecmp(ptr, &names[i], 3) == 0) {
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| 192 | ptr += 3;
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| 193 | if (n1 < 0) {
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| 194 | n1 = i / 3;
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| 195 | } else {
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| 196 | n2 = i / 3;
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| 197 | }
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| 198 | skip = 1;
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| 199 | break;
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| 200 | }
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| 201 | }
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| 202 | }
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| 203 |
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| 204 | /* handle optional range '-' */
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| 205 | if (skip == 0) {
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| 206 | goto err;
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| 207 | }
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| 208 | if (*ptr == '-' && n2 < 0) {
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| 209 | ++ptr;
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| 210 | continue;
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| 211 | }
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| 212 |
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| 213 | /*
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| 214 | * collapse single-value ranges, handle skipmark, and fill
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| 215 | * in the character array appropriately.
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| 216 | */
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| 217 | if (n2 < 0) {
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| 218 | n2 = n1;
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| 219 | }
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| 220 | if (*ptr == '/') {
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| 221 | char *endp;
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| 222 | skip = strtol(ptr + 1, &endp, 10);
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| 223 | ptr = endp; /* gcc likes temp var for &endp */
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| 224 | }
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| 225 |
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| 226 | /*
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| 227 | * fill array, using a failsafe is the easiest way to prevent
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| 228 | * an endless loop
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| 229 | */
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| 230 | {
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| 231 | int s0 = 1;
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| 232 | int failsafe = 1024;
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| 233 |
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| 234 | --n1;
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| 235 | do {
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| 236 | n1 = (n1 + 1) % modvalue;
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| 237 |
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| 238 | if (--s0 == 0) {
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| 239 | ary[n1 % modvalue] = 1;
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| 240 | s0 = skip;
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| 241 | }
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| 242 | if (--failsafe == 0) {
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| 243 | goto err;
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| 244 | }
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| 245 | } while (n1 != n2);
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| 246 | }
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| 247 | if (*ptr != ',') {
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| 248 | break;
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| 249 | }
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| 250 | ++ptr;
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| 251 | n1 = -1;
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| 252 | n2 = -1;
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| 253 | }
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| 254 |
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| 255 | if (*ptr) {
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| 256 | err:
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| 257 | crondlog(WARN9 "user %s: parse error at %s", user, base);
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| 258 | return;
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| 259 | }
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| 260 |
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| 261 | if (DebugOpt && (G.log_level <= 5)) { /* like LVL5 */
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| 262 | /* can't use crondlog, it inserts '\n' */
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| 263 | int i;
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| 264 | for (i = 0; i < modvalue; ++i)
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| 265 | fprintf(stderr, "%d", (unsigned char)ary[i]);
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| 266 | bb_putchar_stderr('\n');
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| 267 | }
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| 268 | }
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| 269 |
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| 270 | static void FixDayDow(CronLine *line)
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| 271 | {
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| 272 | unsigned i;
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| 273 | int weekUsed = 0;
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| 274 | int daysUsed = 0;
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| 275 |
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| 276 | for (i = 0; i < ARRAY_SIZE(line->cl_Dow); ++i) {
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| 277 | if (line->cl_Dow[i] == 0) {
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| 278 | weekUsed = 1;
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| 279 | break;
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| 280 | }
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| 281 | }
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| 282 | for (i = 0; i < ARRAY_SIZE(line->cl_Days); ++i) {
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| 283 | if (line->cl_Days[i] == 0) {
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| 284 | daysUsed = 1;
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| 285 | break;
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| 286 | }
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| 287 | }
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| 288 | if (weekUsed != daysUsed) {
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| 289 | if (weekUsed)
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| 290 | memset(line->cl_Days, 0, sizeof(line->cl_Days));
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| 291 | else /* daysUsed */
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| 292 | memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
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| 293 | }
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| 294 | }
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| 295 |
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| 296 | /*
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| 297 | * delete_cronfile() - delete user database
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| 298 | *
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| 299 | * Note: multiple entries for same user may exist if we were unable to
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| 300 | * completely delete a database due to running processes.
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| 301 | */
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| 302 | //FIXME: we will start a new job even if the old job is running
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| 303 | //if crontab was reloaded: crond thinks that "new" job is different from "old"
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| 304 | //even if they are in fact completely the same. Example
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| 305 | //Crontab was:
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| 306 | // 0-59 * * * * job1
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| 307 | // 0-59 * * * * long_running_job2
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| 308 | //User edits crontab to:
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| 309 | // 0-59 * * * * job1_updated
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| 310 | // 0-59 * * * * long_running_job2
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| 311 | //Bug: crond can now start another long_running_job2 even if old one
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| 312 | //is still running.
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| 313 | //OTOH most other versions of cron do not wait for job termination anyway,
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| 314 | //they end up with multiple copies of jobs if they don't terminate soon enough.
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| 315 | static void delete_cronfile(const char *userName)
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| 316 | {
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| 317 | CronFile **pfile = &G.cron_files;
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| 318 | CronFile *file;
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| 319 |
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| 320 | while ((file = *pfile) != NULL) {
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| 321 | if (strcmp(userName, file->cf_username) == 0) {
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| 322 | CronLine **pline = &file->cf_lines;
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| 323 | CronLine *line;
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| 324 |
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| 325 | file->cf_has_running = 0;
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| 326 | file->cf_deleted = 1;
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| 327 |
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| 328 | while ((line = *pline) != NULL) {
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| 329 | if (line->cl_pid > 0) {
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| 330 | file->cf_has_running = 1;
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| 331 | pline = &line->cl_next;
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| 332 | } else {
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| 333 | *pline = line->cl_next;
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| 334 | free(line->cl_cmd);
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| 335 | free(line);
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| 336 | }
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| 337 | }
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| 338 | if (file->cf_has_running == 0) {
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| 339 | *pfile = file->cf_next;
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| 340 | free(file->cf_username);
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| 341 | free(file);
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| 342 | continue;
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| 343 | }
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| 344 | }
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| 345 | pfile = &file->cf_next;
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| 346 | }
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| 347 | }
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| 348 |
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| 349 | static void load_crontab(const char *fileName)
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| 350 | {
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| 351 | struct parser_t *parser;
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| 352 | struct stat sbuf;
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| 353 | int maxLines;
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| 354 | char *tokens[6];
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| 355 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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| 356 | char *mailTo = NULL;
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| 357 | #endif
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| 358 |
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| 359 | delete_cronfile(fileName);
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| 360 |
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| 361 | if (!getpwnam(fileName)) {
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| 362 | crondlog(LVL7 "ignoring file '%s' (no such user)", fileName);
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| 363 | return;
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| 364 | }
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| 365 |
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| 366 | parser = config_open(fileName);
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| 367 | if (!parser)
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| 368 | return;
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| 369 |
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| 370 | maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES;
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| 371 |
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| 372 | if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DAEMON_UID) {
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| 373 | CronFile *file = xzalloc(sizeof(CronFile));
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| 374 | CronLine **pline;
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| 375 | int n;
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| 376 |
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| 377 | file->cf_username = xstrdup(fileName);
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| 378 | pline = &file->cf_lines;
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| 379 |
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| 380 | while (1) {
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| 381 | CronLine *line;
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| 382 |
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| 383 | if (!--maxLines)
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| 384 | break;
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| 385 | n = config_read(parser, tokens, 6, 1, "# \t", PARSE_NORMAL | PARSE_KEEP_COPY);
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| 386 | if (!n)
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| 387 | break;
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| 388 |
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| 389 | if (DebugOpt)
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| 390 | crondlog(LVL5 "user:%s entry:%s", fileName, parser->data);
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| 391 |
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| 392 | /* check if line is setting MAILTO= */
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| 393 | if (0 == strncmp(tokens[0], "MAILTO=", 7)) {
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| 394 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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| 395 | free(mailTo);
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| 396 | mailTo = (tokens[0][7]) ? xstrdup(&tokens[0][7]) : NULL;
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| 397 | #endif /* otherwise just ignore such lines */
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| 398 | continue;
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| 399 | }
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| 400 | /* check if a minimum of tokens is specified */
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| 401 | if (n < 6)
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| 402 | continue;
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| 403 | *pline = line = xzalloc(sizeof(*line));
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| 404 | /* parse date ranges */
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| 405 | ParseField(file->cf_username, line->cl_Mins, 60, 0, NULL, tokens[0]);
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| 406 | ParseField(file->cf_username, line->cl_Hrs, 24, 0, NULL, tokens[1]);
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| 407 | ParseField(file->cf_username, line->cl_Days, 32, 0, NULL, tokens[2]);
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| 408 | ParseField(file->cf_username, line->cl_Mons, 12, -1, MonAry, tokens[3]);
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| 409 | ParseField(file->cf_username, line->cl_Dow, 7, 0, DowAry, tokens[4]);
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| 410 | /*
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| 411 | * fix days and dow - if one is not "*" and the other
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| 412 | * is "*", the other is set to 0, and vise-versa
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| 413 | */
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| 414 | FixDayDow(line);
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| 415 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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| 416 | /* copy mailto (can be NULL) */
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| 417 | line->cl_mailto = xstrdup(mailTo);
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| 418 | #endif
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| 419 | /* copy command */
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| 420 | line->cl_cmd = xstrdup(tokens[5]);
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| 421 | if (DebugOpt) {
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| 422 | crondlog(LVL5 " command:%s", tokens[5]);
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| 423 | }
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| 424 | pline = &line->cl_next;
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| 425 | //bb_error_msg("M[%s]F[%s][%s][%s][%s][%s][%s]", mailTo, tokens[0], tokens[1], tokens[2], tokens[3], tokens[4], tokens[5]);
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| 426 | }
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| 427 | *pline = NULL;
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| 428 |
|
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| 429 | file->cf_next = G.cron_files;
|
---|
| 430 | G.cron_files = file;
|
---|
| 431 |
|
---|
| 432 | if (maxLines == 0) {
|
---|
| 433 | crondlog(WARN9 "user %s: too many lines", fileName);
|
---|
| 434 | }
|
---|
| 435 | }
|
---|
| 436 | config_close(parser);
|
---|
| 437 | }
|
---|
| 438 |
|
---|
| 439 | static void process_cron_update_file(void)
|
---|
| 440 | {
|
---|
| 441 | FILE *fi;
|
---|
| 442 | char buf[256];
|
---|
| 443 |
|
---|
| 444 | fi = fopen_for_read(CRONUPDATE);
|
---|
| 445 | if (fi != NULL) {
|
---|
| 446 | unlink(CRONUPDATE);
|
---|
| 447 | while (fgets(buf, sizeof(buf), fi) != NULL) {
|
---|
| 448 | /* use first word only */
|
---|
| 449 | skip_non_whitespace(buf)[0] = '\0';
|
---|
| 450 | load_crontab(buf);
|
---|
| 451 | }
|
---|
| 452 | fclose(fi);
|
---|
| 453 | }
|
---|
| 454 | }
|
---|
| 455 |
|
---|
| 456 | static void rescan_crontab_dir(void)
|
---|
| 457 | {
|
---|
| 458 | CronFile *file;
|
---|
| 459 |
|
---|
| 460 | /* Delete all files until we only have ones with running jobs (or none) */
|
---|
| 461 | again:
|
---|
| 462 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 463 | if (!file->cf_deleted) {
|
---|
| 464 | delete_cronfile(file->cf_username);
|
---|
| 465 | goto again;
|
---|
| 466 | }
|
---|
| 467 | }
|
---|
| 468 |
|
---|
| 469 | /* Remove cron update file */
|
---|
| 470 | unlink(CRONUPDATE);
|
---|
| 471 | /* Re-chdir, in case directory was renamed & deleted */
|
---|
| 472 | if (chdir(G.crontab_dir_name) < 0) {
|
---|
| 473 | crondlog(DIE9 "chdir(%s)", G.crontab_dir_name);
|
---|
| 474 | }
|
---|
| 475 |
|
---|
| 476 | /* Scan directory and add associated users */
|
---|
| 477 | {
|
---|
| 478 | DIR *dir = opendir(".");
|
---|
| 479 | struct dirent *den;
|
---|
| 480 |
|
---|
| 481 | if (!dir)
|
---|
| 482 | crondlog(DIE9 "chdir(%s)", "."); /* exits */
|
---|
| 483 | while ((den = readdir(dir)) != NULL) {
|
---|
| 484 | if (strchr(den->d_name, '.') != NULL) {
|
---|
| 485 | continue;
|
---|
| 486 | }
|
---|
| 487 | load_crontab(den->d_name);
|
---|
| 488 | }
|
---|
| 489 | closedir(dir);
|
---|
| 490 | }
|
---|
| 491 | }
|
---|
| 492 |
|
---|
| 493 | #if SETENV_LEAKS
|
---|
| 494 | /* We set environment *before* vfork (because we want to use vfork),
|
---|
| 495 | * so we cannot use setenv() - repeated calls to setenv() may leak memory!
|
---|
| 496 | * Using putenv(), and freeing memory after unsetenv() won't leak */
|
---|
| 497 | static void safe_setenv(char **pvar_val, const char *var, const char *val)
|
---|
| 498 | {
|
---|
| 499 | char *var_val = *pvar_val;
|
---|
| 500 |
|
---|
| 501 | if (var_val) {
|
---|
| 502 | bb_unsetenv_and_free(var_val);
|
---|
| 503 | }
|
---|
| 504 | *pvar_val = xasprintf("%s=%s", var, val);
|
---|
| 505 | putenv(*pvar_val);
|
---|
| 506 | }
|
---|
| 507 | #endif
|
---|
| 508 |
|
---|
| 509 | static void set_env_vars(struct passwd *pas)
|
---|
| 510 | {
|
---|
| 511 | #if SETENV_LEAKS
|
---|
| 512 | safe_setenv(&G.env_var_user, "USER", pas->pw_name);
|
---|
| 513 | safe_setenv(&G.env_var_home, "HOME", pas->pw_dir);
|
---|
| 514 | /* if we want to set user's shell instead: */
|
---|
| 515 | /*safe_setenv(G.env_var_shell, "SHELL", pas->pw_shell);*/
|
---|
| 516 | #else
|
---|
| 517 | xsetenv("USER", pas->pw_name);
|
---|
| 518 | xsetenv("HOME", pas->pw_dir);
|
---|
| 519 | #endif
|
---|
| 520 | /* currently, we use constant one: */
|
---|
| 521 | /*setenv("SHELL", DEFAULT_SHELL, 1); - done earlier */
|
---|
| 522 | }
|
---|
| 523 |
|
---|
| 524 | static void change_user(struct passwd *pas)
|
---|
| 525 | {
|
---|
| 526 | /* careful: we're after vfork! */
|
---|
| 527 | change_identity(pas); /* - initgroups, setgid, setuid */
|
---|
| 528 | if (chdir(pas->pw_dir) < 0) {
|
---|
| 529 | crondlog(WARN9 "chdir(%s)", pas->pw_dir);
|
---|
| 530 | if (chdir(TMPDIR) < 0) {
|
---|
| 531 | crondlog(DIE9 "chdir(%s)", TMPDIR); /* exits */
|
---|
| 532 | }
|
---|
| 533 | }
|
---|
| 534 | }
|
---|
| 535 |
|
---|
| 536 | // TODO: sendmail should be _run-time_ option, not compile-time!
|
---|
| 537 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
| 538 |
|
---|
| 539 | static pid_t
|
---|
| 540 | fork_job(const char *user, int mailFd,
|
---|
| 541 | const char *prog,
|
---|
| 542 | const char *shell_cmd /* if NULL, we run sendmail */
|
---|
| 543 | ) {
|
---|
| 544 | struct passwd *pas;
|
---|
| 545 | pid_t pid;
|
---|
| 546 |
|
---|
| 547 | /* prepare things before vfork */
|
---|
| 548 | pas = getpwnam(user);
|
---|
| 549 | if (!pas) {
|
---|
| 550 | crondlog(WARN9 "can't get uid for %s", user);
|
---|
| 551 | goto err;
|
---|
| 552 | }
|
---|
| 553 | set_env_vars(pas);
|
---|
| 554 |
|
---|
| 555 | pid = vfork();
|
---|
| 556 | if (pid == 0) {
|
---|
| 557 | /* CHILD */
|
---|
| 558 | /* initgroups, setgid, setuid, and chdir to home or TMPDIR */
|
---|
| 559 | change_user(pas);
|
---|
| 560 | if (DebugOpt) {
|
---|
| 561 | crondlog(LVL5 "child running %s", prog);
|
---|
| 562 | }
|
---|
| 563 | if (mailFd >= 0) {
|
---|
| 564 | xmove_fd(mailFd, shell_cmd ? 1 : 0);
|
---|
| 565 | dup2(1, 2);
|
---|
| 566 | }
|
---|
| 567 | /* crond 3.0pl1-100 puts tasks in separate process groups */
|
---|
| 568 | bb_setpgrp();
|
---|
| 569 | execlp(prog, prog, (shell_cmd ? "-c" : SENDMAIL_ARGS), shell_cmd, (char *) NULL);
|
---|
| 570 | crondlog(ERR20 "can't execute '%s' for user %s", prog, user);
|
---|
| 571 | if (shell_cmd) {
|
---|
| 572 | fdprintf(1, "Exec failed: %s -c %s\n", prog, shell_cmd);
|
---|
| 573 | }
|
---|
| 574 | _exit(EXIT_SUCCESS);
|
---|
| 575 | }
|
---|
| 576 |
|
---|
| 577 | if (pid < 0) {
|
---|
| 578 | /* FORK FAILED */
|
---|
| 579 | crondlog(ERR20 "can't vfork");
|
---|
| 580 | err:
|
---|
| 581 | pid = 0;
|
---|
| 582 | } /* else: PARENT, FORK SUCCESS */
|
---|
| 583 |
|
---|
| 584 | /*
|
---|
| 585 | * Close the mail file descriptor.. we can't just leave it open in
|
---|
| 586 | * a structure, closing it later, because we might run out of descriptors
|
---|
| 587 | */
|
---|
| 588 | if (mailFd >= 0) {
|
---|
| 589 | close(mailFd);
|
---|
| 590 | }
|
---|
| 591 | return pid;
|
---|
| 592 | }
|
---|
| 593 |
|
---|
| 594 | static void start_one_job(const char *user, CronLine *line)
|
---|
| 595 | {
|
---|
| 596 | char mailFile[128];
|
---|
| 597 | int mailFd = -1;
|
---|
| 598 |
|
---|
| 599 | line->cl_pid = 0;
|
---|
| 600 | line->cl_empty_mail_size = 0;
|
---|
| 601 |
|
---|
| 602 | if (line->cl_mailto) {
|
---|
| 603 | /* Open mail file (owner is root so nobody can screw with it) */
|
---|
| 604 | snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, getpid());
|
---|
| 605 | mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
|
---|
| 606 |
|
---|
| 607 | if (mailFd >= 0) {
|
---|
| 608 | fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", line->cl_mailto,
|
---|
| 609 | line->cl_cmd);
|
---|
| 610 | line->cl_empty_mail_size = lseek(mailFd, 0, SEEK_CUR);
|
---|
| 611 | } else {
|
---|
| 612 | crondlog(ERR20 "can't create mail file %s for user %s, "
|
---|
| 613 | "discarding output", mailFile, user);
|
---|
| 614 | }
|
---|
| 615 | }
|
---|
| 616 |
|
---|
| 617 | line->cl_pid = fork_job(user, mailFd, DEFAULT_SHELL, line->cl_cmd);
|
---|
| 618 | if (mailFd >= 0) {
|
---|
| 619 | if (line->cl_pid <= 0) {
|
---|
| 620 | unlink(mailFile);
|
---|
| 621 | } else {
|
---|
| 622 | /* rename mail-file based on pid of process */
|
---|
| 623 | char *mailFile2 = xasprintf("%s/cron.%s.%d", TMPDIR, user, (int)line->cl_pid);
|
---|
| 624 | rename(mailFile, mailFile2); // TODO: xrename?
|
---|
| 625 | free(mailFile2);
|
---|
| 626 | }
|
---|
| 627 | }
|
---|
| 628 | }
|
---|
| 629 |
|
---|
| 630 | /*
|
---|
| 631 | * process_finished_job - called when job terminates and when mail terminates
|
---|
| 632 | */
|
---|
| 633 | static void process_finished_job(const char *user, CronLine *line)
|
---|
| 634 | {
|
---|
| 635 | pid_t pid;
|
---|
| 636 | int mailFd;
|
---|
| 637 | char mailFile[128];
|
---|
| 638 | struct stat sbuf;
|
---|
| 639 |
|
---|
| 640 | pid = line->cl_pid;
|
---|
| 641 | line->cl_pid = 0;
|
---|
| 642 | if (pid <= 0) {
|
---|
| 643 | /* No job */
|
---|
| 644 | return;
|
---|
| 645 | }
|
---|
| 646 | if (line->cl_empty_mail_size <= 0) {
|
---|
| 647 | /* End of job and no mail file, or end of sendmail job */
|
---|
| 648 | return;
|
---|
| 649 | }
|
---|
| 650 |
|
---|
| 651 | /*
|
---|
| 652 | * End of primary job - check for mail file.
|
---|
| 653 | * If size has changed and the file is still valid, we send it.
|
---|
| 654 | */
|
---|
| 655 | snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, (int)pid);
|
---|
| 656 | mailFd = open(mailFile, O_RDONLY);
|
---|
| 657 | unlink(mailFile);
|
---|
| 658 | if (mailFd < 0) {
|
---|
| 659 | return;
|
---|
| 660 | }
|
---|
| 661 |
|
---|
| 662 | if (fstat(mailFd, &sbuf) < 0
|
---|
| 663 | || sbuf.st_uid != DAEMON_UID
|
---|
| 664 | || sbuf.st_nlink != 0
|
---|
| 665 | || sbuf.st_size == line->cl_empty_mail_size
|
---|
| 666 | || !S_ISREG(sbuf.st_mode)
|
---|
| 667 | ) {
|
---|
| 668 | close(mailFd);
|
---|
| 669 | return;
|
---|
| 670 | }
|
---|
| 671 | line->cl_empty_mail_size = 0;
|
---|
| 672 | /* if (line->cl_mailto) - always true if cl_empty_mail_size was nonzero */
|
---|
| 673 | line->cl_pid = fork_job(user, mailFd, SENDMAIL, NULL);
|
---|
| 674 | }
|
---|
| 675 |
|
---|
| 676 | #else /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|
| 677 |
|
---|
| 678 | static void start_one_job(const char *user, CronLine *line)
|
---|
| 679 | {
|
---|
| 680 | struct passwd *pas;
|
---|
| 681 | pid_t pid;
|
---|
| 682 |
|
---|
| 683 | pas = getpwnam(user);
|
---|
| 684 | if (!pas) {
|
---|
| 685 | crondlog(WARN9 "can't get uid for %s", user);
|
---|
| 686 | goto err;
|
---|
| 687 | }
|
---|
| 688 |
|
---|
| 689 | /* Prepare things before vfork */
|
---|
| 690 | set_env_vars(pas);
|
---|
| 691 |
|
---|
| 692 | /* Fork as the user in question and run program */
|
---|
| 693 | pid = vfork();
|
---|
| 694 | if (pid == 0) {
|
---|
| 695 | /* CHILD */
|
---|
| 696 | /* initgroups, setgid, setuid, and chdir to home or TMPDIR */
|
---|
| 697 | change_user(pas);
|
---|
| 698 | if (DebugOpt) {
|
---|
| 699 | crondlog(LVL5 "child running %s", DEFAULT_SHELL);
|
---|
| 700 | }
|
---|
| 701 | /* crond 3.0pl1-100 puts tasks in separate process groups */
|
---|
| 702 | bb_setpgrp();
|
---|
| 703 | execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_cmd, (char *) NULL);
|
---|
| 704 | crondlog(ERR20 "can't execute '%s' for user %s", DEFAULT_SHELL, user);
|
---|
| 705 | _exit(EXIT_SUCCESS);
|
---|
| 706 | }
|
---|
| 707 | if (pid < 0) {
|
---|
| 708 | /* FORK FAILED */
|
---|
| 709 | crondlog(ERR20 "can't vfork");
|
---|
| 710 | err:
|
---|
| 711 | pid = 0;
|
---|
| 712 | }
|
---|
| 713 | line->cl_pid = pid;
|
---|
| 714 | }
|
---|
| 715 |
|
---|
| 716 | #define process_finished_job(user, line) ((line)->cl_pid = 0)
|
---|
| 717 |
|
---|
| 718 | #endif /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|
| 719 |
|
---|
| 720 | /*
|
---|
| 721 | * Determine which jobs need to be run. Under normal conditions, the
|
---|
| 722 | * period is about a minute (one scan). Worst case it will be one
|
---|
| 723 | * hour (60 scans).
|
---|
| 724 | */
|
---|
| 725 | static void flag_starting_jobs(time_t t1, time_t t2)
|
---|
| 726 | {
|
---|
| 727 | time_t t;
|
---|
| 728 |
|
---|
| 729 | /* Find jobs > t1 and <= t2 */
|
---|
| 730 |
|
---|
| 731 | for (t = t1 - t1 % 60; t <= t2; t += 60) {
|
---|
| 732 | struct tm *ptm;
|
---|
| 733 | CronFile *file;
|
---|
| 734 | CronLine *line;
|
---|
| 735 |
|
---|
| 736 | if (t <= t1)
|
---|
| 737 | continue;
|
---|
| 738 |
|
---|
| 739 | ptm = localtime(&t);
|
---|
| 740 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 741 | if (DebugOpt)
|
---|
| 742 | crondlog(LVL5 "file %s:", file->cf_username);
|
---|
| 743 | if (file->cf_deleted)
|
---|
| 744 | continue;
|
---|
| 745 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
| 746 | if (DebugOpt)
|
---|
| 747 | crondlog(LVL5 " line %s", line->cl_cmd);
|
---|
| 748 | if (line->cl_Mins[ptm->tm_min]
|
---|
| 749 | && line->cl_Hrs[ptm->tm_hour]
|
---|
| 750 | && (line->cl_Days[ptm->tm_mday] || line->cl_Dow[ptm->tm_wday])
|
---|
| 751 | && line->cl_Mons[ptm->tm_mon]
|
---|
| 752 | ) {
|
---|
| 753 | if (DebugOpt) {
|
---|
| 754 | crondlog(LVL5 " job: %d %s",
|
---|
| 755 | (int)line->cl_pid, line->cl_cmd);
|
---|
| 756 | }
|
---|
| 757 | if (line->cl_pid > 0) {
|
---|
| 758 | crondlog(LVL8 "user %s: process already running: %s",
|
---|
| 759 | file->cf_username, line->cl_cmd);
|
---|
| 760 | } else if (line->cl_pid == 0) {
|
---|
| 761 | line->cl_pid = -1;
|
---|
| 762 | file->cf_wants_starting = 1;
|
---|
| 763 | }
|
---|
| 764 | }
|
---|
| 765 | }
|
---|
| 766 | }
|
---|
| 767 | }
|
---|
| 768 | }
|
---|
| 769 |
|
---|
| 770 | static void start_jobs(void)
|
---|
| 771 | {
|
---|
| 772 | CronFile *file;
|
---|
| 773 | CronLine *line;
|
---|
| 774 |
|
---|
| 775 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 776 | if (!file->cf_wants_starting)
|
---|
| 777 | continue;
|
---|
| 778 |
|
---|
| 779 | file->cf_wants_starting = 0;
|
---|
| 780 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
| 781 | pid_t pid;
|
---|
| 782 | if (line->cl_pid >= 0)
|
---|
| 783 | continue;
|
---|
| 784 |
|
---|
| 785 | start_one_job(file->cf_username, line);
|
---|
| 786 | pid = line->cl_pid;
|
---|
| 787 | crondlog(LVL8 "USER %s pid %3d cmd %s",
|
---|
| 788 | file->cf_username, (int)pid, line->cl_cmd);
|
---|
| 789 | if (pid < 0) {
|
---|
| 790 | file->cf_wants_starting = 1;
|
---|
| 791 | }
|
---|
| 792 | if (pid > 0) {
|
---|
| 793 | file->cf_has_running = 1;
|
---|
| 794 | }
|
---|
| 795 | }
|
---|
| 796 | }
|
---|
| 797 | }
|
---|
| 798 |
|
---|
| 799 | /*
|
---|
| 800 | * Check for job completion, return number of jobs still running after
|
---|
| 801 | * all done.
|
---|
| 802 | */
|
---|
| 803 | static int check_completions(void)
|
---|
| 804 | {
|
---|
| 805 | CronFile *file;
|
---|
| 806 | CronLine *line;
|
---|
| 807 | int num_still_running = 0;
|
---|
| 808 |
|
---|
| 809 | for (file = G.cron_files; file; file = file->cf_next) {
|
---|
| 810 | if (!file->cf_has_running)
|
---|
| 811 | continue;
|
---|
| 812 |
|
---|
| 813 | file->cf_has_running = 0;
|
---|
| 814 | for (line = file->cf_lines; line; line = line->cl_next) {
|
---|
| 815 | int r;
|
---|
| 816 |
|
---|
| 817 | if (line->cl_pid <= 0)
|
---|
| 818 | continue;
|
---|
| 819 |
|
---|
| 820 | r = waitpid(line->cl_pid, NULL, WNOHANG);
|
---|
| 821 | if (r < 0 || r == line->cl_pid) {
|
---|
| 822 | process_finished_job(file->cf_username, line);
|
---|
| 823 | if (line->cl_pid == 0) {
|
---|
| 824 | /* sendmail was not started for it */
|
---|
| 825 | continue;
|
---|
| 826 | }
|
---|
| 827 | /* else: sendmail was started, job is still running, fall thru */
|
---|
| 828 | }
|
---|
| 829 | /* else: r == 0: "process is still running" */
|
---|
| 830 | file->cf_has_running = 1;
|
---|
| 831 | }
|
---|
| 832 | //FIXME: if !file->cf_has_running && file->deleted: delete it!
|
---|
| 833 | //otherwise deleted entries will stay forever, right?
|
---|
| 834 | num_still_running += file->cf_has_running;
|
---|
| 835 | }
|
---|
| 836 | return num_still_running;
|
---|
| 837 | }
|
---|
| 838 |
|
---|
| 839 | int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 840 | int crond_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 841 | {
|
---|
| 842 | time_t t2;
|
---|
| 843 | int rescan;
|
---|
| 844 | int sleep_time;
|
---|
| 845 | unsigned opts;
|
---|
| 846 |
|
---|
| 847 | INIT_G();
|
---|
| 848 |
|
---|
| 849 | /* "-b after -f is ignored", and so on for every pair a-b */
|
---|
| 850 | opt_complementary = "f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
|
---|
| 851 | ":l+:d+"; /* -l and -d have numeric param */
|
---|
| 852 | opts = getopt32(argv, "l:L:fbSc:" IF_FEATURE_CROND_D("d:"),
|
---|
| 853 | &G.log_level, &G.log_filename, &G.crontab_dir_name
|
---|
| 854 | IF_FEATURE_CROND_D(,&G.log_level));
|
---|
| 855 | /* both -d N and -l N set the same variable: G.log_level */
|
---|
| 856 |
|
---|
| 857 | if (!(opts & OPT_f)) {
|
---|
| 858 | /* close stdin, stdout, stderr.
|
---|
| 859 | * close unused descriptors - don't need them. */
|
---|
| 860 | bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
|
---|
| 861 | }
|
---|
| 862 |
|
---|
| 863 | if (!(opts & OPT_d) && G.log_filename == NULL) {
|
---|
| 864 | /* logging to syslog */
|
---|
| 865 | openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
|
---|
| 866 | logmode = LOGMODE_SYSLOG;
|
---|
| 867 | }
|
---|
| 868 |
|
---|
| 869 | xchdir(G.crontab_dir_name);
|
---|
| 870 | //signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
|
---|
| 871 | xsetenv("SHELL", DEFAULT_SHELL); /* once, for all future children */
|
---|
| 872 | crondlog(LVL8 "crond (busybox "BB_VER") started, log level %d", G.log_level);
|
---|
| 873 | rescan_crontab_dir();
|
---|
| 874 | write_pidfile("/var/run/crond.pid");
|
---|
| 875 |
|
---|
| 876 | /* Main loop */
|
---|
| 877 | t2 = time(NULL);
|
---|
| 878 | rescan = 60;
|
---|
| 879 | sleep_time = 60;
|
---|
| 880 | for (;;) {
|
---|
| 881 | struct stat sbuf;
|
---|
| 882 | time_t t1;
|
---|
| 883 | long dt;
|
---|
| 884 |
|
---|
| 885 | t1 = t2;
|
---|
| 886 |
|
---|
| 887 | /* Synchronize to 1 minute, minimum 1 second */
|
---|
| 888 | sleep(sleep_time - (time(NULL) % sleep_time) + 1);
|
---|
| 889 |
|
---|
| 890 | t2 = time(NULL);
|
---|
| 891 | dt = (long)t2 - (long)t1;
|
---|
| 892 |
|
---|
| 893 | /*
|
---|
| 894 | * The file 'cron.update' is checked to determine new cron
|
---|
| 895 | * jobs. The directory is rescanned once an hour to deal
|
---|
| 896 | * with any screwups.
|
---|
| 897 | *
|
---|
| 898 | * Check for time jump. Disparities over an hour either way
|
---|
| 899 | * result in resynchronization. A negative disparity
|
---|
| 900 | * less than an hour causes us to effectively sleep until we
|
---|
| 901 | * match the original time (i.e. no re-execution of jobs that
|
---|
| 902 | * have just been run). A positive disparity less than
|
---|
| 903 | * an hour causes intermediate jobs to be run, but only once
|
---|
| 904 | * in the worst case.
|
---|
| 905 | *
|
---|
| 906 | * When running jobs, the inequality used is greater but not
|
---|
| 907 | * equal to t1, and less then or equal to t2.
|
---|
| 908 | */
|
---|
| 909 | if (stat(G.crontab_dir_name, &sbuf) != 0)
|
---|
| 910 | sbuf.st_mtime = 0; /* force update (once) if dir was deleted */
|
---|
| 911 | if (G.crontab_dir_mtime != sbuf.st_mtime) {
|
---|
| 912 | G.crontab_dir_mtime = sbuf.st_mtime;
|
---|
| 913 | rescan = 1;
|
---|
| 914 | }
|
---|
| 915 | if (--rescan == 0) {
|
---|
| 916 | rescan = 60;
|
---|
| 917 | rescan_crontab_dir();
|
---|
| 918 | }
|
---|
| 919 | process_cron_update_file();
|
---|
| 920 | if (DebugOpt)
|
---|
| 921 | crondlog(LVL5 "wakeup dt=%ld", dt);
|
---|
| 922 | if (dt < -60 * 60 || dt > 60 * 60) {
|
---|
| 923 | crondlog(WARN9 "time disparity of %ld minutes detected", dt / 60);
|
---|
| 924 | /* and we do not run any jobs in this case */
|
---|
| 925 | } else if (dt > 0) {
|
---|
| 926 | /* Usual case: time advances forward, as expected */
|
---|
| 927 | flag_starting_jobs(t1, t2);
|
---|
| 928 | start_jobs();
|
---|
| 929 | if (check_completions() > 0) {
|
---|
| 930 | /* some jobs are still running */
|
---|
| 931 | sleep_time = 10;
|
---|
| 932 | } else {
|
---|
| 933 | sleep_time = 60;
|
---|
| 934 | }
|
---|
| 935 | }
|
---|
| 936 | /* else: time jumped back, do not run any jobs */
|
---|
| 937 | } /* for (;;) */
|
---|
| 938 |
|
---|
| 939 | return 0; /* not reached */
|
---|
| 940 | }
|
---|