busybox/miscutils/crond.c

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/* vi: set sw=4 ts=4: */
/*
* run as root, but NOT setuid root
*
* Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
* (version 2.3.2)
2006-04-17 02:08:26 +05:30
* Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config CROND
//config: bool "crond (14 kb)"
//config: default y
//config: select FEATURE_SYSLOG
//config: help
//config: Crond is a background daemon that parses individual crontab
//config: files and executes commands on behalf of the users in question.
//config: This is a port of dcron from slackware. It uses files of the
//config: format /var/spool/cron/crontabs/<username> files, for example:
//config: $ cat /var/spool/cron/crontabs/root
//config: # Run daily cron jobs at 4:40 every day:
//config: 40 4 * * * /etc/cron/daily > /dev/null 2>&1
//config:
//config:config FEATURE_CROND_D
//config: bool "Support -d (redirect output to stderr)"
//config: depends on CROND
//config: default y
//config: help
//config: -d N sets loglevel (0:most verbose) and directs all output to stderr.
//config:
//config:config FEATURE_CROND_CALL_SENDMAIL
//config: bool "Report command output via email (using sendmail)"
//config: default y
//config: depends on CROND
//config: help
//config: Command output will be sent to corresponding user via email.
//config:
//config:config FEATURE_CROND_SPECIAL_TIMES
//config: bool "Support special times (@reboot, @daily, etc) in crontabs"
//config: default y
//config: depends on CROND
//config: help
//config: string meaning
//config: ------ -------
//config: @reboot Run once, at startup
//config: @yearly Run once a year: "0 0 1 1 *"
//config: @annually Same as @yearly: "0 0 1 1 *"
//config: @monthly Run once a month: "0 0 1 * *"
//config: @weekly Run once a week: "0 0 * * 0"
//config: @daily Run once a day: "0 0 * * *"
//config: @midnight Same as @daily: "0 0 * * *"
//config: @hourly Run once an hour: "0 * * * *"
//config:
//config:config FEATURE_CROND_DIR
//config: string "crond spool directory"
//config: default "/var/spool/cron"
//config: depends on CROND || CRONTAB
//config: help
//config: Location of crond spool.
//applet:IF_CROND(APPLET(crond, BB_DIR_USR_SBIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_CROND) += crond.o
//usage:#define crond_trivial_usage
//usage: "[-fbS] [-l N] " IF_FEATURE_CROND_D("[-d N] ") "[-L LOGFILE] [-c DIR]"
//usage:#define crond_full_usage "\n\n"
//usage: " -f Foreground"
//usage: "\n -b Background (default)"
//usage: "\n -S Log to syslog (default)"
//usage: "\n -l N Set log level. Most verbose 0, default 8"
//usage: IF_FEATURE_CROND_D(
//usage: "\n -d N Set log level, log to stderr"
//usage: )
//usage: "\n -L FILE Log to FILE"
//usage: "\n -c DIR Cron dir. Default:"CONFIG_FEATURE_CROND_DIR"/crontabs"
#include "libbb.h"
#include "common_bufsiz.h"
#include <syslog.h>
#if 0
/* If libc tracks and reuses setenv()-allocated memory, ok to set this to 0 */
/* Neither glibc nor uclibc do that! */
# define SETENV_LEAKS 0
#else
# define SETENV_LEAKS 1
#endif
#define CRON_DIR CONFIG_FEATURE_CROND_DIR
#define CRONTABS CONFIG_FEATURE_CROND_DIR "/crontabs"
#define CRON_REBOOT CONFIG_PID_FILE_PATH "/crond.reboot"
#ifndef SENDMAIL
# define SENDMAIL "sendmail"
#endif
#ifndef SENDMAIL_ARGS
# define SENDMAIL_ARGS "-ti"
#endif
#ifndef CRONUPDATE
# define CRONUPDATE "cron.update"
#endif
#ifndef MAXLINES
# define MAXLINES 256 /* max lines in non-root crontabs */
#endif
typedef struct CronFile {
struct CronFile *cf_next;
struct CronLine *cf_lines;
char *cf_username;
smallint cf_wants_starting; /* bool: one or more jobs ready */
smallint cf_has_running; /* bool: one or more jobs running */
smallint cf_deleted; /* marked for deletion (but still has running jobs) */
} CronFile;
typedef struct CronLine {
struct CronLine *cl_next;
char *cl_cmd; /* shell command */
pid_t cl_pid; /* >0:running, <0:needs to be started in this minute, 0:dormant */
#define START_ME_REBOOT -2
#define START_ME_NORMAL -1
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
int cl_empty_mail_size; /* size of mail header only, 0 if no mailfile */
char *cl_mailto; /* whom to mail results, may be NULL */
#endif
char *cl_shell;
/* ordered by size, not in natural order. makes code smaller: */
char cl_Dow[7]; /* 0-6, beginning sunday */
char cl_Mons[12]; /* 0-11 */
char cl_Hrs[24]; /* 0-23 */
char cl_Days[32]; /* 1-31 */
char cl_Mins[60]; /* 0-59 */
} CronLine;
#define DAEMON_UID 0
enum {
OPT_l = (1 << 0),
OPT_L = (1 << 1),
OPT_f = (1 << 2),
OPT_b = (1 << 3),
OPT_S = (1 << 4),
OPT_c = (1 << 5),
OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D,
};
struct globals {
unsigned log_level; /* = 8; */
time_t crontab_dir_mtime;
const char *log_filename;
const char *crontab_dir_name; /* = CRONTABS; */
CronFile *cron_files;
char *default_shell;
#if SETENV_LEAKS
char *env_var_user;
char *env_var_home;
char *env_var_shell;
char *env_var_logname;
#endif
} FIX_ALIASING;
#define G (*(struct globals*)bb_common_bufsiz1)
#define INIT_G() do { \
setup_common_bufsiz(); \
G.log_level = 8; \
G.crontab_dir_name = CRONTABS; \
} while (0)
/* Log levels:
* 0 is the most verbose, default 8.
* For some reason, in fact only 5, 7 and 8 are used.
*/
static void crondlog(unsigned level, const char *msg, va_list va)
{
if (level >= G.log_level) {
/*
* We are called only for info meesages.
* Warnings/errors use plain bb_[p]error_msg's, which
* need not touch syslog_level
* (they are ok with LOG_ERR default).
*/
Optionally re-introduce bb_info_msg() Between Busybox 1.24.2 and 1.25.0 the bb_info_msg() function was eliminated and calls to it changed to be bb_error_msg(). The downside of this is that daemons now log all messages to syslog at the LOG_ERR level which makes it hard to filter errors from informational messages. This change optionally re-introduces bb_info_msg(), controlled by a new option FEATURE_SYSLOG_INFO, restores all the calls to bb_info_msg() that were removed (only in applets that set logmode to LOGMODE_SYSLOG or LOGMODE_BOTH), and also changes informational messages in ifplugd and ntpd. The code size change of this is as follows (using 'defconfig' on x86_64 with gcc 7.3.0-27ubuntu1~18.04) function old new delta bb_info_msg - 182 +182 bb_vinfo_msg - 27 +27 static.log7 194 198 +4 log8 190 191 +1 log5 190 191 +1 crondlog 45 - -45 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 3/0 up/down: 215/-45) Total: 170 bytes If you don't care about everything being logged at LOG_ERR level then when FEATURE_SYSLOG_INFO is disabled Busybox actually gets smaller: function old new delta static.log7 194 200 +6 log8 190 193 +3 log5 190 193 +3 syslog_level 1 - -1 bb_verror_msg 583 581 -2 crondlog 45 - -45 ------------------------------------------------------------------------------ (add/remove: 0/2 grow/shrink: 3/1 up/down: 12/-48) Total: -36 bytes Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-12 22:31:51 +05:30
bb_vinfo_msg(msg, va);
}
}
static void log5(const char *msg, ...)
{
va_list va;
va_start(va, msg);
crondlog(4, msg, va);
va_end(va);
}
static void log7(const char *msg, ...)
{
va_list va;
va_start(va, msg);
crondlog(7, msg, va);
va_end(va);
}
static void log8(const char *msg, ...)
{
va_list va;
va_start(va, msg);
crondlog(8, msg, va);
va_end(va);
}
2007-08-20 00:19:21 +05:30
static const char DowAry[] ALIGN1 =
"sun""mon""tue""wed""thu""fri""sat"
;
static const char MonAry[] ALIGN1 =
"jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
;
static void ParseField(char *user, char *ary, int modvalue, int off,
2007-08-20 00:19:21 +05:30
const char *names, char *ptr)
/* 'names' is a pointer to a set of 3-char abbreviations */
{
char *base = ptr;
int n1 = -1;
int n2 = -1;
// this can't happen due to config_read()
/*if (base == NULL)
return;*/
while (1) {
int skip = 0;
/* Handle numeric digit or symbol or '*' */
if (*ptr == '*') {
n1 = 0; /* everything will be filled */
n2 = modvalue - 1;
skip = 1;
++ptr;
} else if (isdigit(*ptr)) {
char *endp;
if (n1 < 0) {
n1 = strtol(ptr, &endp, 10) + off;
} else {
n2 = strtol(ptr, &endp, 10) + off;
}
ptr = endp; /* gcc likes temp var for &endp */
skip = 1;
} else if (names) {
int i;
2007-08-20 00:19:21 +05:30
for (i = 0; names[i]; i += 3) {
/* was using strncmp before... */
if (strncasecmp(ptr, &names[i], 3) == 0) {
ptr += 3;
if (n1 < 0) {
n1 = i / 3;
} else {
n2 = i / 3;
}
skip = 1;
break;
}
}
}
/* handle optional range '-' */
if (skip == 0) {
goto err;
}
if (*ptr == '-' && n2 < 0) {
++ptr;
continue;
}
/*
* collapse single-value ranges, handle skipmark, and fill
* in the character array appropriately.
*/
if (n2 < 0) {
n2 = n1;
}
if (*ptr == '/') {
char *endp;
skip = strtol(ptr + 1, &endp, 10);
ptr = endp; /* gcc likes temp var for &endp */
}
/*
* fill array, using a failsafe is the easiest way to prevent
* an endless loop
*/
{
int s0 = 1;
int failsafe = 1024;
--n1;
do {
n1 = (n1 + 1) % modvalue;
if (--s0 == 0) {
ary[n1 % modvalue] = 1;
s0 = skip;
}
if (--failsafe == 0) {
goto err;
}
} while (n1 != n2);
}
if (*ptr != ',') {
break;
}
++ptr;
n1 = -1;
n2 = -1;
}
if (*ptr) {
err:
bb_error_msg("user %s: parse error at %s", user, base);
return;
}
/* can't use log5 (it inserts newlines), open-coding it */
if (G.log_level <= 5 && logmode != LOGMODE_SYSLOG) {
int i;
for (i = 0; i < modvalue; ++i)
fprintf(stderr, "%d", (unsigned char)ary[i]);
bb_putchar_stderr('\n');
}
}
static void FixDayDow(CronLine *line)
{
unsigned i;
int weekUsed = 0;
int daysUsed = 0;
for (i = 0; i < ARRAY_SIZE(line->cl_Dow); ++i) {
if (line->cl_Dow[i] == 0) {
weekUsed = 1;
break;
}
}
for (i = 0; i < ARRAY_SIZE(line->cl_Days); ++i) {
if (line->cl_Days[i] == 0) {
daysUsed = 1;
break;
}
}
if (weekUsed != daysUsed) {
if (weekUsed)
memset(line->cl_Days, 0, sizeof(line->cl_Days));
else /* daysUsed */
memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
}
}
/*
* delete_cronfile() - delete user database
*
* Note: multiple entries for same user may exist if we were unable to
* completely delete a database due to running processes.
*/
//FIXME: we will start a new job even if the old job is running
//if crontab was reloaded: crond thinks that "new" job is different from "old"
//even if they are in fact completely the same. Example
//Crontab was:
// 0-59 * * * * job1
// 0-59 * * * * long_running_job2
//User edits crontab to:
// 0-59 * * * * job1_updated
// 0-59 * * * * long_running_job2
//Bug: crond can now start another long_running_job2 even if old one
//is still running.
//OTOH most other versions of cron do not wait for job termination anyway,
//they end up with multiple copies of jobs if they don't terminate soon enough.
static void delete_cronfile(const char *userName)
{
CronFile **pfile = &G.cron_files;
CronFile *file;
while ((file = *pfile) != NULL) {
if (strcmp(userName, file->cf_username) == 0) {
CronLine **pline = &file->cf_lines;
CronLine *line;
file->cf_has_running = 0;
file->cf_deleted = 1;
while ((line = *pline) != NULL) {
if (line->cl_pid > 0) {
file->cf_has_running = 1;
pline = &line->cl_next;
} else {
*pline = line->cl_next;
free(line->cl_cmd);
free(line);
}
}
if (file->cf_has_running == 0) {
*pfile = file->cf_next;
free(file->cf_username);
free(file);
continue;
}
}
pfile = &file->cf_next;
}
}
static void load_crontab(const char *fileName)
{
struct parser_t *parser;
struct stat sbuf;
int maxLines;
char *tokens[6];
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
char *mailTo = NULL;
#endif
char *shell = NULL;
delete_cronfile(fileName);
if (!getpwnam(fileName)) {
log7("ignoring file '%s' (no such user)", fileName);
return;
}
parser = config_open(fileName);
if (!parser)
return;
maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES;
if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DAEMON_UID) {
CronFile *file = xzalloc(sizeof(CronFile));
CronLine **pline;
int n;
file->cf_username = xstrdup(fileName);
pline = &file->cf_lines;
while (1) {
CronLine *line;
if (!--maxLines) {
bb_error_msg("user %s: too many lines", fileName);
break;
}
n = config_read(parser, tokens, 6, 1, "# \t", PARSE_NORMAL | PARSE_KEEP_COPY);
if (!n)
break;
log5("user:%s entry:%s", fileName, parser->data);
/* check if line is setting MAILTO= */
libbb: introduce and use is_prefixed_with() function old new delta is_prefixed_with - 18 +18 complete_username 78 77 -1 man_main 737 735 -2 fsck_device 429 427 -2 unpack_ar_archive 80 76 -4 strip_unsafe_prefix 105 101 -4 singlemount 1054 1050 -4 rtc_adjtime_is_utc 90 86 -4 resolve_mount_spec 88 84 -4 parse_one_line 1029 1025 -4 parse_conf 1460 1456 -4 may_wakeup 83 79 -4 loadkmap_main 219 215 -4 get_irqs_from_stat 103 99 -4 get_header_cpio 913 909 -4 findfs_main 79 75 -4 fbsplash_main 1230 1226 -4 load_crontab 776 771 -5 expand_vars_to_list 1151 1146 -5 date_main 881 876 -5 skip_dev_pfx 30 24 -6 make_device 2199 2193 -6 complete_cmd_dir_file 773 767 -6 run_applet_and_exit 715 708 -7 uudecode_main 321 313 -8 pwdx_main 197 189 -8 execute 568 560 -8 i2cdetect_main 1186 1176 -10 procps_scan 1242 1230 -12 procps_read_smaps 1017 1005 -12 process_module 746 734 -12 patch_main 1903 1891 -12 nfsmount 3572 3560 -12 stack_machine 126 112 -14 process_timer_stats 449 435 -14 match_fstype 111 97 -14 do_ipaddr 1344 1330 -14 open_list_and_close 359 343 -16 get_header_tar 1795 1779 -16 prepend_new_eth_table 340 323 -17 fsck_main 1811 1794 -17 find_iface_state 56 38 -18 dnsd_main 1321 1303 -18 base_device 179 158 -21 find_keyword 104 82 -22 handle_incoming_and_exit 2785 2762 -23 parse_and_put_prompt 774 746 -28 modinfo 347 317 -30 find_action 204 171 -33 update_passwd 1470 1436 -34 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540) Total: -522 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-03-12 22:18:34 +05:30
if (is_prefixed_with(tokens[0], "MAILTO=")) {
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
free(mailTo);
mailTo = (tokens[0][7]) ? xstrdup(&tokens[0][7]) : NULL;
#endif /* otherwise just ignore such lines */
continue;
}
libbb: introduce and use is_prefixed_with() function old new delta is_prefixed_with - 18 +18 complete_username 78 77 -1 man_main 737 735 -2 fsck_device 429 427 -2 unpack_ar_archive 80 76 -4 strip_unsafe_prefix 105 101 -4 singlemount 1054 1050 -4 rtc_adjtime_is_utc 90 86 -4 resolve_mount_spec 88 84 -4 parse_one_line 1029 1025 -4 parse_conf 1460 1456 -4 may_wakeup 83 79 -4 loadkmap_main 219 215 -4 get_irqs_from_stat 103 99 -4 get_header_cpio 913 909 -4 findfs_main 79 75 -4 fbsplash_main 1230 1226 -4 load_crontab 776 771 -5 expand_vars_to_list 1151 1146 -5 date_main 881 876 -5 skip_dev_pfx 30 24 -6 make_device 2199 2193 -6 complete_cmd_dir_file 773 767 -6 run_applet_and_exit 715 708 -7 uudecode_main 321 313 -8 pwdx_main 197 189 -8 execute 568 560 -8 i2cdetect_main 1186 1176 -10 procps_scan 1242 1230 -12 procps_read_smaps 1017 1005 -12 process_module 746 734 -12 patch_main 1903 1891 -12 nfsmount 3572 3560 -12 stack_machine 126 112 -14 process_timer_stats 449 435 -14 match_fstype 111 97 -14 do_ipaddr 1344 1330 -14 open_list_and_close 359 343 -16 get_header_tar 1795 1779 -16 prepend_new_eth_table 340 323 -17 fsck_main 1811 1794 -17 find_iface_state 56 38 -18 dnsd_main 1321 1303 -18 base_device 179 158 -21 find_keyword 104 82 -22 handle_incoming_and_exit 2785 2762 -23 parse_and_put_prompt 774 746 -28 modinfo 347 317 -30 find_action 204 171 -33 update_passwd 1470 1436 -34 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540) Total: -522 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-03-12 22:18:34 +05:30
if (is_prefixed_with(tokens[0], "SHELL=")) {
free(shell);
shell = xstrdup(&tokens[0][6]);
continue;
}
//TODO: handle HOME= too? "man crontab" says:
//name = value
//
//where the spaces around the equal-sign (=) are optional, and any subsequent
//non-leading spaces in value will be part of the value assigned to name.
//The value string may be placed in quotes (single or double, but matching)
//to preserve leading or trailing blanks.
//
//Several environment variables are set up automatically by the cron(8) daemon.
//SHELL is set to /bin/sh, and LOGNAME and HOME are set from the /etc/passwd
//line of the crontab's owner. HOME and SHELL may be overridden by settings
//in the crontab; LOGNAME may not.
#if ENABLE_FEATURE_CROND_SPECIAL_TIMES
if (tokens[0][0] == '@') {
/*
* "@daily /a/script/to/run PARAM1 PARAM2..."
*/
typedef struct SpecialEntry {
const char *name;
const char tokens[8];
} SpecialEntry;
static const SpecialEntry SpecAry[] ALIGN8 = {
/* hour day month weekday */
{ "yearly", "0\0" "1\0" "1\0" "*" },
{ "annually", "0\0" "1\0" "1\0" "*" },
{ "monthly", "0\0" "1\0" "*\0" "*" },
{ "weekly", "0\0" "*\0" "*\0" "0" },
{ "daily", "0\0" "*\0" "*\0" "*" },
{ "midnight", "0\0" "*\0" "*\0" "*" },
{ "hourly", "*\0" "*\0" "*\0" "*" },
{ "reboot", "" },
};
const SpecialEntry *e = SpecAry;
if (n < 2)
continue;
for (;;) {
if (strcmp(e->name, tokens[0] + 1) == 0) {
/*
* tokens[1] is only the first word of command,
* can'r use it.
* find the entire command in unmodified string:
*/
tokens[5] = skip_whitespace(
skip_non_whitespace(
skip_whitespace(parser->data)));
if (e->tokens[0]) {
char *et = (char*)e->tokens;
/* minute is "0" for all specials */
tokens[0] = (char*)"0";
tokens[1] = et;
tokens[2] = et + 2;
tokens[3] = et + 4;
tokens[4] = et + 6;
}
goto got_it;
}
if (!e->tokens[0])
break;
e++;
}
continue; /* bad line (unrecognized '@foo') */
}
#endif
/* check if a minimum of tokens is specified */
if (n < 6)
continue;
IF_FEATURE_CROND_SPECIAL_TIMES(
got_it:
)
*pline = line = xzalloc(sizeof(*line));
#if ENABLE_FEATURE_CROND_SPECIAL_TIMES
if (tokens[0][0] == '@') { /* "@reboot" line */
file->cf_wants_starting = 1;
line->cl_pid = START_ME_REBOOT; /* wants to start */
/* line->cl_Mins/Hrs/etc stay zero: never match any time */
} else
#endif
{
/* parse date ranges */
ParseField(file->cf_username, line->cl_Mins, 60, 0, NULL, tokens[0]);
ParseField(file->cf_username, line->cl_Hrs, 24, 0, NULL, tokens[1]);
ParseField(file->cf_username, line->cl_Days, 32, 0, NULL, tokens[2]);
ParseField(file->cf_username, line->cl_Mons, 12, -1, MonAry, tokens[3]);
ParseField(file->cf_username, line->cl_Dow, 7, 0, DowAry, tokens[4]);
/*
* fix days and dow - if one is not "*" and the other
* is "*", the other is set to 0, and vise-versa
*/
FixDayDow(line);
}
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
/* copy mailto (can be NULL) */
line->cl_mailto = xstrdup(mailTo);
#endif
line->cl_shell = xstrdup(shell);
/* copy command */
line->cl_cmd = xstrdup(tokens[5]);
pline = &line->cl_next;
//bb_error_msg("M[%s]F[%s][%s][%s][%s][%s][%s]", mailTo, tokens[0], tokens[1], tokens[2], tokens[3], tokens[4], tokens[5]);
}
*pline = NULL;
file->cf_next = G.cron_files;
G.cron_files = file;
}
config_close(parser);
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
free(mailTo);
#endif
free(shell);
}
static void process_cron_update_file(void)
{
FILE *fi;
char buf[256];
fi = fopen_for_read(CRONUPDATE);
if (fi != NULL) {
unlink(CRONUPDATE);
while (fgets(buf, sizeof(buf), fi) != NULL) {
/* use first word only */
skip_non_whitespace(buf)[0] = '\0';
load_crontab(buf);
}
fclose(fi);
}
}
static void rescan_crontab_dir(void)
{
CronFile *file;
/* Delete all files until we only have ones with running jobs (or none) */
again:
for (file = G.cron_files; file; file = file->cf_next) {
if (!file->cf_deleted) {
delete_cronfile(file->cf_username);
goto again;
}
}
/* Remove cron update file */
unlink(CRONUPDATE);
/* Re-chdir, in case directory was renamed & deleted */
xchdir(G.crontab_dir_name);
/* Scan directory and add associated users */
{
DIR *dir = opendir(".");
struct dirent *den;
/* xopendir exists, but "can't open '.'" is not informative */
if (!dir)
bb_error_msg_and_die("can't open '%s'", G.crontab_dir_name);
while ((den = readdir(dir)) != NULL) {
if (strchr(den->d_name, '.') != NULL) {
continue;
}
load_crontab(den->d_name);
}
closedir(dir);
}
}
#if SETENV_LEAKS
/* We set environment *before* vfork (because we want to use vfork),
* so we cannot use setenv() - repeated calls to setenv() may leak memory!
* Using putenv(), and freeing memory after unsetenv() won't leak */
static void safe_setenv(char **pvar_val, const char *var, const char *val)
{
char *var_val = *pvar_val;
if (var_val) {
bb_unsetenv_and_free(var_val);
}
*pvar_val = xasprintf("%s=%s", var, val);
putenv(*pvar_val);
}
#endif
static void set_env_vars(struct passwd *pas, const char *shell)
{
/* POSIX requires crond to set up at least HOME, LOGNAME, PATH, SHELL.
* We assume crond inherited suitable PATH.
*/
#if SETENV_LEAKS
safe_setenv(&G.env_var_logname, "LOGNAME", pas->pw_name);
safe_setenv(&G.env_var_user, "USER", pas->pw_name);
safe_setenv(&G.env_var_home, "HOME", pas->pw_dir);
safe_setenv(&G.env_var_shell, "SHELL", shell);
#else
xsetenv("LOGNAME", pas->pw_name);
xsetenv("USER", pas->pw_name);
xsetenv("HOME", pas->pw_dir);
xsetenv("SHELL", shell);
#endif
}
static void change_user(struct passwd *pas)
{
/* careful: we're after vfork! */
change_identity(pas); /* - initgroups, setgid, setuid */
if (chdir_or_warn(pas->pw_dir) != 0) {
xchdir(CRON_DIR);
}
}
// TODO: sendmail should be _run-time_ option, not compile-time!
#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
static pid_t
fork_job(const char *user, int mailFd, CronLine *line, bool run_sendmail)
{
struct passwd *pas;
const char *shell, *prog;
smallint sv_logmode;
pid_t pid;
/* prepare things before vfork */
pas = getpwnam(user);
if (!pas) {
bb_error_msg("can't get uid for %s", user);
goto err;
}
shell = line->cl_shell ? line->cl_shell : G.default_shell;
prog = run_sendmail ? SENDMAIL : shell;
set_env_vars(pas, shell);
sv_logmode = logmode;
pid = vfork();
if (pid == 0) {
/* CHILD */
/* initgroups, setgid, setuid, and chdir to home or CRON_DIR */
change_user(pas);
log5("child running %s", prog);
if (mailFd >= 0) {
xmove_fd(mailFd, run_sendmail ? 0 : 1);
dup2(1, 2);
}
/* crond 3.0pl1-100 puts tasks in separate process groups */
bb_setpgrp();
if (!run_sendmail)
execlp(prog, prog, "-c", line->cl_cmd, (char *) NULL);
else
execlp(prog, prog, SENDMAIL_ARGS, (char *) NULL);
/*
* I want this error message on stderr too,
* even if other messages go only to syslog:
*/
logmode |= LOGMODE_STDIO;
bb_error_msg_and_die("can't execute '%s' for user %s", prog, user);
}
logmode = sv_logmode;
if (pid < 0) {
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_perror_msg("vfork");
err:
pid = 0;
} /* else: PARENT, FORK SUCCESS */
/*
* Close the mail file descriptor.. we can't just leave it open in
* a structure, closing it later, because we might run out of descriptors
*/
if (mailFd >= 0) {
close(mailFd);
}
return pid;
}
static pid_t start_one_job(const char *user, CronLine *line)
{
char mailFile[128];
int mailFd = -1;
line->cl_pid = 0;
line->cl_empty_mail_size = 0;
if (line->cl_mailto) {
/* Open mail file (owner is root so nobody can screw with it) */
snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", CRON_DIR, user, getpid());
mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
if (mailFd >= 0) {
fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", line->cl_mailto,
line->cl_cmd);
line->cl_empty_mail_size = lseek(mailFd, 0, SEEK_CUR);
} else {
bb_error_msg("can't create mail file %s for user %s, "
"discarding output", mailFile, user);
}
}
line->cl_pid = fork_job(user, mailFd, line, /*sendmail?*/ 0);
if (mailFd >= 0) {
if (line->cl_pid <= 0) {
unlink(mailFile);
} else {
/* rename mail-file based on pid of process */
char *mailFile2 = xasprintf("%s/cron.%s.%d", CRON_DIR, user, (int)line->cl_pid);
rename(mailFile, mailFile2); // TODO: xrename?
free(mailFile2);
}
}
return line->cl_pid;
}
/*
* process_finished_job - called when job terminates and when mail terminates
*/
static void process_finished_job(const char *user, CronLine *line)
{
pid_t pid;
int mailFd;
char mailFile[128];
struct stat sbuf;
pid = line->cl_pid;
line->cl_pid = 0;
if (pid <= 0) {
/* No job */
return;
}
if (line->cl_empty_mail_size <= 0) {
/* End of job and no mail file, or end of sendmail job */
return;
}
/*
* End of primary job - check for mail file.
* If size has changed and the file is still valid, we send it.
*/
snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", CRON_DIR, user, (int)pid);
mailFd = open(mailFile, O_RDONLY);
unlink(mailFile);
if (mailFd < 0) {
return;
}
if (fstat(mailFd, &sbuf) < 0
|| sbuf.st_uid != DAEMON_UID
|| sbuf.st_nlink != 0
|| sbuf.st_size == line->cl_empty_mail_size
|| !S_ISREG(sbuf.st_mode)
) {
close(mailFd);
return;
}
line->cl_empty_mail_size = 0;
/* if (line->cl_mailto) - always true if cl_empty_mail_size was nonzero */
line->cl_pid = fork_job(user, mailFd, line, /*sendmail?*/ 1);
}
#else /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
static pid_t start_one_job(const char *user, CronLine *line)
{
const char *shell;
struct passwd *pas;
pid_t pid;
pas = getpwnam(user);
if (!pas) {
bb_error_msg("can't get uid for %s", user);
goto err;
}
/* Prepare things before vfork */
shell = line->cl_shell ? line->cl_shell : G.default_shell;
set_env_vars(pas, shell);
/* Fork as the user in question and run program */
pid = vfork();
if (pid == 0) {
/* CHILD */
/* initgroups, setgid, setuid, and chdir to home or CRON_DIR */
change_user(pas);
log5("child running %s", shell);
/* crond 3.0pl1-100 puts tasks in separate process groups */
bb_setpgrp();
execl(shell, shell, "-c", line->cl_cmd, (char *) NULL);
bb_error_msg_and_die("can't execute '%s' for user %s", shell, user);
}
if (pid < 0) {
libbb: reduce the overhead of single parameter bb_error_msg() calls Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02 15:05:03 +05:30
bb_simple_perror_msg("vfork");
err:
pid = 0;
}
line->cl_pid = pid;
return pid;
}
#define process_finished_job(user, line) ((line)->cl_pid = 0)
#endif /* !ENABLE_FEATURE_CROND_CALL_SENDMAIL */
/*
* Determine which jobs need to be run. Under normal conditions, the
* period is about a minute (one scan). Worst case it will be one
* hour (60 scans).
*/
static void flag_starting_jobs(time_t t1, time_t t2)
{
time_t t;
/* Find jobs > t1 and <= t2 */
for (t = t1 - t1 % 60; t <= t2; t += 60) {
struct tm *ptm;
CronFile *file;
CronLine *line;
if (t <= t1)
continue;
ptm = localtime(&t);
for (file = G.cron_files; file; file = file->cf_next) {
log5("file %s:", file->cf_username);
if (file->cf_deleted)
continue;
for (line = file->cf_lines; line; line = line->cl_next) {
log5(" line %s", line->cl_cmd);
if (line->cl_Mins[ptm->tm_min]
&& line->cl_Hrs[ptm->tm_hour]
&& (line->cl_Days[ptm->tm_mday] || line->cl_Dow[ptm->tm_wday])
&& line->cl_Mons[ptm->tm_mon]
) {
log5(" job: %d %s",
(int)line->cl_pid, line->cl_cmd);
if (line->cl_pid > 0) {
log8("user %s: process already running: %s",
file->cf_username, line->cl_cmd);
} else if (line->cl_pid == 0) {
line->cl_pid = START_ME_NORMAL;
file->cf_wants_starting = 1;
}
}
}
}
}
}
#if ENABLE_FEATURE_CROND_SPECIAL_TIMES
static int touch_reboot_file(void)
{
int fd = open(CRON_REBOOT, O_WRONLY | O_CREAT | O_EXCL | O_TRUNC, 0000);
if (fd >= 0) {
close(fd);
return 1;
}
/* File (presumably) exists - this is not the first run after reboot */
return 0;
}
#endif
static void start_jobs(int wants_start)
{
CronFile *file;
CronLine *line;
for (file = G.cron_files; file; file = file->cf_next) {
if (!file->cf_wants_starting)
continue;
file->cf_wants_starting = 0;
for (line = file->cf_lines; line; line = line->cl_next) {
pid_t pid;
if (line->cl_pid != wants_start)
continue;
pid = start_one_job(file->cf_username, line);
log8("USER %s pid %3d cmd %s",
file->cf_username, (int)pid, line->cl_cmd);
if (pid < 0) {
file->cf_wants_starting = 1;
}
if (pid > 0) {
file->cf_has_running = 1;
}
}
}
}
/*
* Check for job completion, return number of jobs still running after
* all done.
*/
static int check_completions(void)
{
CronFile *file;
CronLine *line;
int num_still_running = 0;
for (file = G.cron_files; file; file = file->cf_next) {
if (!file->cf_has_running)
continue;
file->cf_has_running = 0;
for (line = file->cf_lines; line; line = line->cl_next) {
int r;
if (line->cl_pid <= 0)
continue;
r = waitpid(line->cl_pid, NULL, WNOHANG);
if (r < 0 || r == line->cl_pid) {
process_finished_job(file->cf_username, line);
if (line->cl_pid == 0) {
/* sendmail was not started for it */
continue;
}
/* else: sendmail was started, job is still running, fall thru */
}
/* else: r == 0: "process is still running" */
file->cf_has_running = 1;
}
//FIXME: if !file->cf_has_running && file->deleted: delete it!
//otherwise deleted entries will stay forever, right?
num_still_running += file->cf_has_running;
}
return num_still_running;
}
static void reopen_logfile_to_stderr(void)
{
if (G.log_filename) {
int logfd = open_or_warn(G.log_filename, O_WRONLY | O_CREAT | O_APPEND);
if (logfd >= 0)
xmove_fd(logfd, STDERR_FILENO);
}
}
int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int crond_main(int argc UNUSED_PARAM, char **argv)
{
time_t t2;
unsigned rescan;
unsigned sleep_time;
unsigned opts;
INIT_G();
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
opts = getopt32(argv, "^"
"l:L:fbSc:" IF_FEATURE_CROND_D("d:")
"\0"
/* "-b after -f is ignored", and so on for every pair a-b */
"f-b:b-f:S-L:L-S" IF_FEATURE_CROND_D(":d-l")
/* -l and -d have numeric param */
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
":l+" IF_FEATURE_CROND_D(":d+")
,
&G.log_level, &G.log_filename, &G.crontab_dir_name
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
IF_FEATURE_CROND_D(,&G.log_level)
);
/* both -d N and -l N set the same variable: G.log_level */
if (!(opts & OPT_f)) {
/* close stdin, stdout, stderr.
* close unused descriptors - don't need them. */
bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
}
if (!(opts & OPT_d) && G.log_filename == NULL) {
/* logging to syslog */
openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
logmode = LOGMODE_SYSLOG;
}
//signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
reopen_logfile_to_stderr();
xchdir(G.crontab_dir_name);
/* $SHELL, or current UID's shell, or DEFAULT_SHELL */
/* Useful on Android where DEFAULT_SHELL /bin/sh may not exist */
G.default_shell = xstrdup(get_shell_name());
log8("crond (busybox "BB_VER") started, log level %d", G.log_level);
rescan_crontab_dir();
write_pidfile_std_path_and_ext("crond");
#if ENABLE_FEATURE_CROND_SPECIAL_TIMES
if (touch_reboot_file())
start_jobs(START_ME_REBOOT); /* start @reboot entries, if any */
#endif
/* Main loop */
t2 = time(NULL);
rescan = 60;
sleep_time = 60;
for (;;) {
struct stat sbuf;
time_t t1;
long dt;
/* Synchronize to 1 minute, minimum 1 second */
t1 = t2;
sleep(sleep_time - (time(NULL) % sleep_time));
t2 = time(NULL);
dt = (long)t2 - (long)t1;
reopen_logfile_to_stderr();
/*
* The file 'cron.update' is checked to determine new cron
* jobs. The directory is rescanned once an hour to deal
* with any screwups.
*
* Check for time jump. Disparities over an hour either way
* result in resynchronization. A negative disparity
* less than an hour causes us to effectively sleep until we
* match the original time (i.e. no re-execution of jobs that
* have just been run). A positive disparity less than
* an hour causes intermediate jobs to be run, but only once
* in the worst case.
*
* When running jobs, the inequality used is greater but not
* equal to t1, and less then or equal to t2.
*/
if (stat(G.crontab_dir_name, &sbuf) != 0)
sbuf.st_mtime = 0; /* force update (once) if dir was deleted */
if (G.crontab_dir_mtime != sbuf.st_mtime) {
G.crontab_dir_mtime = sbuf.st_mtime;
rescan = 1;
}
if (--rescan == 0) {
rescan = 60;
rescan_crontab_dir();
}
process_cron_update_file();
log5("wakeup dt=%ld", dt);
if (dt < -60 * 60 || dt > 60 * 60) {
Optionally re-introduce bb_info_msg() Between Busybox 1.24.2 and 1.25.0 the bb_info_msg() function was eliminated and calls to it changed to be bb_error_msg(). The downside of this is that daemons now log all messages to syslog at the LOG_ERR level which makes it hard to filter errors from informational messages. This change optionally re-introduces bb_info_msg(), controlled by a new option FEATURE_SYSLOG_INFO, restores all the calls to bb_info_msg() that were removed (only in applets that set logmode to LOGMODE_SYSLOG or LOGMODE_BOTH), and also changes informational messages in ifplugd and ntpd. The code size change of this is as follows (using 'defconfig' on x86_64 with gcc 7.3.0-27ubuntu1~18.04) function old new delta bb_info_msg - 182 +182 bb_vinfo_msg - 27 +27 static.log7 194 198 +4 log8 190 191 +1 log5 190 191 +1 crondlog 45 - -45 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 3/0 up/down: 215/-45) Total: 170 bytes If you don't care about everything being logged at LOG_ERR level then when FEATURE_SYSLOG_INFO is disabled Busybox actually gets smaller: function old new delta static.log7 194 200 +6 log8 190 193 +3 log5 190 193 +3 syslog_level 1 - -1 bb_verror_msg 583 581 -2 crondlog 45 - -45 ------------------------------------------------------------------------------ (add/remove: 0/2 grow/shrink: 3/1 up/down: 12/-48) Total: -36 bytes Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-12 22:31:51 +05:30
bb_info_msg("time disparity of %ld minutes detected", dt / 60);
/* and we do not run any jobs in this case */
} else if (dt > 0) {
/* Usual case: time advances forward, as expected */
flag_starting_jobs(t1, t2);
start_jobs(START_ME_NORMAL);
sleep_time = 60;
if (check_completions() > 0) {
/* some jobs are still running */
sleep_time = 10;
}
}
/* else: time jumped back, do not run any jobs */
} /* for (;;) */
return 0; /* not reached */
}