[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * crond -d[#] -c <crondir> -f -b
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| 4 | *
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| 5 | * run as root, but NOT setuid root
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| 6 | *
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| 7 | * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
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| 8 | * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
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| 9 | *
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| 10 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 11 | */
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| 12 |
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| 13 | #define VERSION "2.3.2"
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| 14 |
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| 15 | #include "busybox.h"
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| 16 | #include <stdio.h>
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| 17 | #include <stdlib.h>
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| 18 | #include <stdarg.h>
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| 19 | #include <string.h>
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| 20 | #include <errno.h>
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| 21 | #include <time.h>
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| 22 | #include <dirent.h>
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| 23 | #include <fcntl.h>
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| 24 | #include <unistd.h>
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| 25 | #include <syslog.h>
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| 26 | #include <signal.h>
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| 27 | #include <getopt.h>
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| 28 | #include <sys/ioctl.h>
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| 29 | #include <sys/wait.h>
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| 30 | #include <sys/stat.h>
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| 31 | #include <sys/resource.h>
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| 32 |
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| 33 | #define arysize(ary) (sizeof(ary)/sizeof((ary)[0]))
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| 34 |
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| 35 | #ifndef CRONTABS
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| 36 | #define CRONTABS "/var/spool/cron/crontabs"
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| 37 | #endif
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| 38 | #ifndef TMPDIR
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| 39 | #define TMPDIR "/var/spool/cron"
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| 40 | #endif
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| 41 | #ifndef SENDMAIL
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| 42 | #define SENDMAIL "/usr/sbin/sendmail"
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| 43 | #endif
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| 44 | #ifndef SENDMAIL_ARGS
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| 45 | #define SENDMAIL_ARGS "-ti", "oem"
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| 46 | #endif
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| 47 | #ifndef CRONUPDATE
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| 48 | #define CRONUPDATE "cron.update"
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| 49 | #endif
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| 50 | #ifndef MAXLINES
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| 51 | #define MAXLINES 256 /* max lines in non-root crontabs */
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| 52 | #endif
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| 53 |
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| 54 | typedef struct CronFile {
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| 55 | struct CronFile *cf_Next;
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| 56 | struct CronLine *cf_LineBase;
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| 57 | char *cf_User; /* username */
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| 58 | int cf_Ready; /* bool: one or more jobs ready */
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| 59 | int cf_Running; /* bool: one or more jobs running */
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| 60 | int cf_Deleted; /* marked for deletion, ignore */
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| 61 | } CronFile;
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| 62 |
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| 63 | typedef struct CronLine {
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| 64 | struct CronLine *cl_Next;
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| 65 | char *cl_Shell; /* shell command */
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| 66 | pid_t cl_Pid; /* running pid, 0, or armed (-1) */
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| 67 | int cl_MailFlag; /* running pid is for mail */
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| 68 | int cl_MailPos; /* 'empty file' size */
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| 69 | char cl_Mins[60]; /* 0-59 */
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| 70 | char cl_Hrs[24]; /* 0-23 */
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| 71 | char cl_Days[32]; /* 1-31 */
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| 72 | char cl_Mons[12]; /* 0-11 */
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| 73 | char cl_Dow[7]; /* 0-6, beginning sunday */
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| 74 | } CronLine;
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| 75 |
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| 76 | #define RUN_RANOUT 1
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| 77 | #define RUN_RUNNING 2
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| 78 | #define RUN_FAILED 3
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| 79 |
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| 80 | #define DaemonUid 0
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| 81 |
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| 82 | #if ENABLE_DEBUG_CROND_OPTION
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| 83 | static short DebugOpt;
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| 84 | #endif
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| 85 |
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| 86 | static short LogLevel = 8;
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| 87 | static const char *LogFile;
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| 88 | static const char *CDir = CRONTABS;
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| 89 |
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| 90 | static void startlogger(void);
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| 91 |
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| 92 | static void CheckUpdates(void);
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| 93 | static void SynchronizeDir(void);
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| 94 | static int TestJobs(time_t t1, time_t t2);
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| 95 | static void RunJobs(void);
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| 96 | static int CheckJobs(void);
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| 97 |
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| 98 | static void RunJob(const char *user, CronLine * line);
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| 99 |
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| 100 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
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| 101 | static void EndJob(const char *user, CronLine * line);
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| 102 | #else
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| 103 | #define EndJob(user, line) line->cl_Pid = 0
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| 104 | #endif
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| 105 |
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| 106 | static void DeleteFile(const char *userName);
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| 107 |
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| 108 | static CronFile *FileBase;
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| 109 |
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| 110 |
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| 111 | static void crondlog(const char *ctl, ...)
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| 112 | {
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| 113 | va_list va;
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| 114 | const char *fmt;
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| 115 | int level = (int) (ctl[0] & 0xf);
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| 116 | int type = level == 20 ?
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| 117 | LOG_ERR : ((ctl[0] & 0100) ? LOG_WARNING : LOG_NOTICE);
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| 118 |
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| 119 |
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| 120 | va_start(va, ctl);
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| 121 | fmt = ctl + 1;
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| 122 | if (level >= LogLevel) {
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| 123 |
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| 124 | #if ENABLE_DEBUG_CROND_OPTION
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| 125 | if (DebugOpt) {
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| 126 | vfprintf(stderr, fmt, va);
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| 127 | } else
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| 128 | #endif
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| 129 | if (LogFile == 0) {
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| 130 | vsyslog(type, fmt, va);
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| 131 | } else {
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| 132 | int logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
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| 133 | if (logfd >= 0) {
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| 134 | vdprintf(logfd, fmt, va);
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| 135 | close(logfd);
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| 136 | #if ENABLE_DEBUG_CROND_OPTION
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| 137 | } else {
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| 138 | bb_perror_msg("Can't open log file");
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| 139 | #endif
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| 140 | }
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| 141 | }
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| 142 | }
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| 143 | va_end(va);
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| 144 | if (ctl[0] & 0200) {
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| 145 | exit(20);
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| 146 | }
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| 147 | }
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| 148 |
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| 149 | int crond_main(int ac, char **av)
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| 150 | {
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| 151 | unsigned long opt;
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| 152 | char *lopt, *Lopt, *copt;
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| 153 |
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| 154 | #if ENABLE_DEBUG_CROND_OPTION
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| 155 | char *dopt;
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| 156 |
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| 157 | bb_opt_complementally = "f-b:b-f:S-L:L-S:d-l";
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| 158 | #else
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| 159 | bb_opt_complementally = "f-b:b-f:S-L:L-S";
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| 160 | #endif
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| 161 |
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| 162 | opterr = 0; /* disable getopt 'errors' message. */
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| 163 | opt = bb_getopt_ulflags(ac, av, "l:L:fbSc:"
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| 164 | #if ENABLE_DEBUG_CROND_OPTION
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| 165 | "d:"
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| 166 | #endif
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| 167 | , &lopt, &Lopt, &copt
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| 168 | #if ENABLE_DEBUG_CROND_OPTION
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| 169 | , &dopt
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| 170 | #endif
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| 171 | );
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| 172 | if (opt & 1) {
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| 173 | LogLevel = atoi(lopt);
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| 174 | }
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| 175 | if (opt & 2) {
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| 176 | if (*Lopt != 0) {
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| 177 | LogFile = Lopt;
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| 178 | }
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| 179 | }
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| 180 | if (opt & 32) {
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| 181 | if (*copt != 0) {
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| 182 | CDir = copt;
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| 183 | }
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| 184 | }
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| 185 | #if ENABLE_DEBUG_CROND_OPTION
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| 186 | if (opt & 64) {
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| 187 | DebugOpt = atoi(dopt);
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| 188 | LogLevel = 0;
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| 189 | }
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| 190 | #endif
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| 191 |
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| 192 | /*
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| 193 | * change directory
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| 194 | */
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| 195 |
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| 196 | bb_xchdir(CDir);
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| 197 | signal(SIGHUP, SIG_IGN); /* hmm.. but, if kill -HUP original
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| 198 | * version - his died. ;(
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| 199 | */
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| 200 | /*
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| 201 | * close stdin and stdout, stderr.
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| 202 | * close unused descriptors - don't need.
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| 203 | * optional detach from controlling terminal
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| 204 | */
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| 205 |
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| 206 | if (!(opt & 4)) {
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| 207 | #ifdef BB_NOMMU
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| 208 | /* reexec for vfork() do continue parent */
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| 209 | vfork_daemon_rexec(1, 0, ac, av, "-f");
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| 210 | #else
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| 211 | bb_xdaemon(1, 0);
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| 212 | #endif
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| 213 | }
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| 214 |
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| 215 | (void) startlogger(); /* need if syslog mode selected */
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| 216 |
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| 217 | /*
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| 218 | * main loop - synchronize to 1 second after the minute, minimum sleep
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| 219 | * of 1 second.
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| 220 | */
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| 221 |
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| 222 | crondlog("\011%s " VERSION " dillon, started, log level %d\n",
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| 223 | bb_applet_name, LogLevel);
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| 224 |
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| 225 | SynchronizeDir();
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| 226 |
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| 227 | {
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| 228 | time_t t1 = time(NULL);
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| 229 | time_t t2;
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| 230 | long dt;
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| 231 | int rescan = 60;
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| 232 | short sleep_time = 60;
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| 233 |
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| 234 | for (;;) {
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| 235 | sleep((sleep_time + 1) - (short) (time(NULL) % sleep_time));
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| 236 |
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| 237 | t2 = time(NULL);
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| 238 | dt = t2 - t1;
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| 239 |
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| 240 | /*
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| 241 | * The file 'cron.update' is checked to determine new cron
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| 242 | * jobs. The directory is rescanned once an hour to deal
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| 243 | * with any screwups.
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| 244 | *
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| 245 | * check for disparity. Disparities over an hour either way
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| 246 | * result in resynchronization. A reverse-indexed disparity
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| 247 | * less then an hour causes us to effectively sleep until we
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| 248 | * match the original time (i.e. no re-execution of jobs that
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| 249 | * have just been run). A forward-indexed disparity less then
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| 250 | * an hour causes intermediate jobs to be run, but only once
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| 251 | * in the worst case.
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| 252 | *
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| 253 | * when running jobs, the inequality used is greater but not
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| 254 | * equal to t1, and less then or equal to t2.
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| 255 | */
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| 256 |
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| 257 | if (--rescan == 0) {
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| 258 | rescan = 60;
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| 259 | SynchronizeDir();
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| 260 | }
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| 261 | CheckUpdates();
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| 262 | #if ENABLE_DEBUG_CROND_OPTION
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| 263 | if (DebugOpt)
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| 264 | crondlog("\005Wakeup dt=%d\n", dt);
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| 265 | #endif
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| 266 | if (dt < -60 * 60 || dt > 60 * 60) {
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| 267 | t1 = t2;
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| 268 | crondlog("\111time disparity of %d minutes detected\n", dt / 60);
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| 269 | } else if (dt > 0) {
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| 270 | TestJobs(t1, t2);
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| 271 | RunJobs();
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| 272 | sleep(5);
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| 273 | if (CheckJobs() > 0) {
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| 274 | sleep_time = 10;
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| 275 | } else {
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| 276 | sleep_time = 60;
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| 277 | }
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| 278 | t1 = t2;
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| 279 | }
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| 280 | }
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| 281 | }
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| 282 | bb_fflush_stdout_and_exit(EXIT_SUCCESS); /* not reached */
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| 283 | }
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| 284 |
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| 285 | static int ChangeUser(const char *user)
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| 286 | {
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| 287 | struct passwd *pas;
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| 288 | const char *err_msg;
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| 289 |
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| 290 | /*
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| 291 | * Obtain password entry and change privileges
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| 292 | */
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| 293 | pas = getpwnam(user);
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| 294 | if (pas == 0) {
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| 295 | crondlog("\011failed to get uid for %s", user);
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| 296 | return (-1);
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| 297 | }
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| 298 | setenv("USER", pas->pw_name, 1);
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| 299 | setenv("HOME", pas->pw_dir, 1);
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| 300 | setenv("SHELL", DEFAULT_SHELL, 1);
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| 301 |
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| 302 | /*
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| 303 | * Change running state to the user in question
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| 304 | */
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| 305 | err_msg = change_identity_e2str(pas);
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| 306 | if (err_msg) {
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| 307 | crondlog("\011%s for user %s", err_msg, user);
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| 308 | return (-1);
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| 309 | }
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| 310 | if (chdir(pas->pw_dir) < 0) {
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| 311 | crondlog("\011chdir failed: %s: %m", pas->pw_dir);
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| 312 | if (chdir(TMPDIR) < 0) {
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| 313 | crondlog("\011chdir failed: %s: %m", TMPDIR);
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| 314 | return (-1);
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| 315 | }
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| 316 | }
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| 317 | return (pas->pw_uid);
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| 318 | }
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| 319 |
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| 320 | static void startlogger(void)
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| 321 | {
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| 322 | if (LogFile == 0) {
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| 323 | openlog(bb_applet_name, LOG_CONS | LOG_PID, LOG_CRON);
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| 324 | }
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| 325 | #if ENABLE_DEBUG_CROND_OPTION
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| 326 | else { /* test logfile */
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| 327 | int logfd;
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| 328 |
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| 329 | if ((logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600)) >= 0) {
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| 330 | close(logfd);
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| 331 | } else {
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| 332 | bb_perror_msg("Failed to open log file '%s' reason", LogFile);
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| 333 | }
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| 334 | }
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| 335 | #endif
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| 336 | }
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| 337 |
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| 338 |
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| 339 | static const char *const DowAry[] = {
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| 340 | "sun",
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| 341 | "mon",
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| 342 | "tue",
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| 343 | "wed",
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| 344 | "thu",
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| 345 | "fri",
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| 346 | "sat",
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| 347 |
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| 348 | "Sun",
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| 349 | "Mon",
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| 350 | "Tue",
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| 351 | "Wed",
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| 352 | "Thu",
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| 353 | "Fri",
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| 354 | "Sat",
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| 355 | NULL
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| 356 | };
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| 357 |
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| 358 | static const char *const MonAry[] = {
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| 359 | "jan",
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| 360 | "feb",
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| 361 | "mar",
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| 362 | "apr",
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| 363 | "may",
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| 364 | "jun",
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| 365 | "jul",
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| 366 | "aug",
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| 367 | "sep",
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| 368 | "oct",
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| 369 | "nov",
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| 370 | "dec",
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| 371 |
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| 372 | "Jan",
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| 373 | "Feb",
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| 374 | "Mar",
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| 375 | "Apr",
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| 376 | "May",
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| 377 | "Jun",
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| 378 | "Jul",
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| 379 | "Aug",
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| 380 | "Sep",
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| 381 | "Oct",
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| 382 | "Nov",
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| 383 | "Dec",
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| 384 | NULL
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| 385 | };
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| 386 |
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| 387 | static char *ParseField(char *user, char *ary, int modvalue, int off,
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| 388 | const char *const *names, char *ptr)
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| 389 | {
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| 390 | char *base = ptr;
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| 391 | int n1 = -1;
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| 392 | int n2 = -1;
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| 393 |
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| 394 | if (base == NULL) {
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| 395 | return (NULL);
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| 396 | }
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| 397 |
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| 398 | while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
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| 399 | int skip = 0;
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| 400 |
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| 401 | /* Handle numeric digit or symbol or '*' */
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| 402 |
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| 403 | if (*ptr == '*') {
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| 404 | n1 = 0; /* everything will be filled */
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| 405 | n2 = modvalue - 1;
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| 406 | skip = 1;
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| 407 | ++ptr;
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| 408 | } else if (*ptr >= '0' && *ptr <= '9') {
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| 409 | if (n1 < 0) {
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| 410 | n1 = strtol(ptr, &ptr, 10) + off;
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| 411 | } else {
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| 412 | n2 = strtol(ptr, &ptr, 10) + off;
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| 413 | }
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| 414 | skip = 1;
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| 415 | } else if (names) {
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| 416 | int i;
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| 417 |
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| 418 | for (i = 0; names[i]; ++i) {
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| 419 | if (strncmp(ptr, names[i], strlen(names[i])) == 0) {
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| 420 | break;
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| 421 | }
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| 422 | }
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| 423 | if (names[i]) {
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| 424 | ptr += strlen(names[i]);
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| 425 | if (n1 < 0) {
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| 426 | n1 = i;
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| 427 | } else {
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| 428 | n2 = i;
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| 429 | }
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| 430 | skip = 1;
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| 431 | }
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| 432 | }
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| 433 |
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| 434 | /* handle optional range '-' */
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| 435 |
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| 436 | if (skip == 0) {
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| 437 | crondlog("\111failed user %s parsing %s\n", user, base);
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| 438 | return (NULL);
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| 439 | }
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| 440 | if (*ptr == '-' && n2 < 0) {
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| 441 | ++ptr;
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| 442 | continue;
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| 443 | }
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| 444 |
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| 445 | /*
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| 446 | * collapse single-value ranges, handle skipmark, and fill
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| 447 | * in the character array appropriately.
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| 448 | */
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| 449 |
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| 450 | if (n2 < 0) {
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| 451 | n2 = n1;
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| 452 | }
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| 453 | if (*ptr == '/') {
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| 454 | skip = strtol(ptr + 1, &ptr, 10);
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| 455 | }
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| 456 | /*
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| 457 | * fill array, using a failsafe is the easiest way to prevent
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| 458 | * an endless loop
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| 459 | */
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| 460 |
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| 461 | {
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| 462 | int s0 = 1;
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| 463 | int failsafe = 1024;
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| 464 |
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| 465 | --n1;
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| 466 | do {
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| 467 | n1 = (n1 + 1) % modvalue;
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| 468 |
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| 469 | if (--s0 == 0) {
|
---|
| 470 | ary[n1 % modvalue] = 1;
|
---|
| 471 | s0 = skip;
|
---|
| 472 | }
|
---|
| 473 | }
|
---|
| 474 | while (n1 != n2 && --failsafe);
|
---|
| 475 |
|
---|
| 476 | if (failsafe == 0) {
|
---|
| 477 | crondlog("\111failed user %s parsing %s\n", user, base);
|
---|
| 478 | return (NULL);
|
---|
| 479 | }
|
---|
| 480 | }
|
---|
| 481 | if (*ptr != ',') {
|
---|
| 482 | break;
|
---|
| 483 | }
|
---|
| 484 | ++ptr;
|
---|
| 485 | n1 = -1;
|
---|
| 486 | n2 = -1;
|
---|
| 487 | }
|
---|
| 488 |
|
---|
| 489 | if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
|
---|
| 490 | crondlog("\111failed user %s parsing %s\n", user, base);
|
---|
| 491 | return (NULL);
|
---|
| 492 | }
|
---|
| 493 |
|
---|
| 494 | while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n') {
|
---|
| 495 | ++ptr;
|
---|
| 496 | }
|
---|
| 497 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 498 | if (DebugOpt) {
|
---|
| 499 | int i;
|
---|
| 500 |
|
---|
| 501 | for (i = 0; i < modvalue; ++i) {
|
---|
| 502 | crondlog("\005%d", ary[i]);
|
---|
| 503 | }
|
---|
| 504 | crondlog("\005\n");
|
---|
| 505 | }
|
---|
| 506 | #endif
|
---|
| 507 |
|
---|
| 508 | return (ptr);
|
---|
| 509 | }
|
---|
| 510 |
|
---|
| 511 | static void FixDayDow(CronLine * line)
|
---|
| 512 | {
|
---|
| 513 | int i;
|
---|
| 514 | int weekUsed = 0;
|
---|
| 515 | int daysUsed = 0;
|
---|
| 516 |
|
---|
| 517 | for (i = 0; i < (int)(arysize(line->cl_Dow)); ++i) {
|
---|
| 518 | if (line->cl_Dow[i] == 0) {
|
---|
| 519 | weekUsed = 1;
|
---|
| 520 | break;
|
---|
| 521 | }
|
---|
| 522 | }
|
---|
| 523 | for (i = 0; i < (int)(arysize(line->cl_Days)); ++i) {
|
---|
| 524 | if (line->cl_Days[i] == 0) {
|
---|
| 525 | daysUsed = 1;
|
---|
| 526 | break;
|
---|
| 527 | }
|
---|
| 528 | }
|
---|
| 529 | if (weekUsed && !daysUsed) {
|
---|
| 530 | memset(line->cl_Days, 0, sizeof(line->cl_Days));
|
---|
| 531 | }
|
---|
| 532 | if (daysUsed && !weekUsed) {
|
---|
| 533 | memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
|
---|
| 534 | }
|
---|
| 535 | }
|
---|
| 536 |
|
---|
| 537 |
|
---|
| 538 |
|
---|
| 539 | static void SynchronizeFile(const char *fileName)
|
---|
| 540 | {
|
---|
| 541 | int maxEntries = MAXLINES;
|
---|
| 542 | int maxLines;
|
---|
| 543 | char buf[1024];
|
---|
| 544 |
|
---|
| 545 | if (strcmp(fileName, "root") == 0) {
|
---|
| 546 | maxEntries = 65535;
|
---|
| 547 | }
|
---|
| 548 | maxLines = maxEntries * 10;
|
---|
| 549 |
|
---|
| 550 | if (fileName) {
|
---|
| 551 | FILE *fi;
|
---|
| 552 |
|
---|
| 553 | DeleteFile(fileName);
|
---|
| 554 |
|
---|
| 555 | fi = fopen(fileName, "r");
|
---|
| 556 | if (fi != NULL) {
|
---|
| 557 | struct stat sbuf;
|
---|
| 558 |
|
---|
| 559 | if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
|
---|
| 560 | CronFile *file = calloc(1, sizeof(CronFile));
|
---|
| 561 | CronLine **pline;
|
---|
| 562 |
|
---|
| 563 | file->cf_User = strdup(fileName);
|
---|
| 564 | pline = &file->cf_LineBase;
|
---|
| 565 |
|
---|
| 566 | while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
|
---|
| 567 | CronLine line;
|
---|
| 568 | char *ptr;
|
---|
| 569 |
|
---|
| 570 | trim(buf);
|
---|
| 571 | if (buf[0] == 0 || buf[0] == '#') {
|
---|
| 572 | continue;
|
---|
| 573 | }
|
---|
| 574 | if (--maxEntries == 0) {
|
---|
| 575 | break;
|
---|
| 576 | }
|
---|
| 577 | memset(&line, 0, sizeof(line));
|
---|
| 578 |
|
---|
| 579 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 580 | if (DebugOpt) {
|
---|
| 581 | crondlog("\111User %s Entry %s\n", fileName, buf);
|
---|
| 582 | }
|
---|
| 583 | #endif
|
---|
| 584 |
|
---|
| 585 | /* parse date ranges */
|
---|
| 586 | ptr = ParseField(file->cf_User, line.cl_Mins, 60, 0, NULL, buf);
|
---|
| 587 | ptr = ParseField(file->cf_User, line.cl_Hrs, 24, 0, NULL, ptr);
|
---|
| 588 | ptr = ParseField(file->cf_User, line.cl_Days, 32, 0, NULL, ptr);
|
---|
| 589 | ptr = ParseField(file->cf_User, line.cl_Mons, 12, -1, MonAry, ptr);
|
---|
| 590 | ptr = ParseField(file->cf_User, line.cl_Dow, 7, 0, DowAry, ptr);
|
---|
| 591 |
|
---|
| 592 | /* check failure */
|
---|
| 593 | if (ptr == NULL) {
|
---|
| 594 | continue;
|
---|
| 595 | }
|
---|
| 596 |
|
---|
| 597 | /*
|
---|
| 598 | * fix days and dow - if one is not * and the other
|
---|
| 599 | * is *, the other is set to 0, and vise-versa
|
---|
| 600 | */
|
---|
| 601 |
|
---|
| 602 | FixDayDow(&line);
|
---|
| 603 |
|
---|
| 604 | *pline = calloc(1, sizeof(CronLine));
|
---|
| 605 | **pline = line;
|
---|
| 606 |
|
---|
| 607 | /* copy command */
|
---|
| 608 | (*pline)->cl_Shell = strdup(ptr);
|
---|
| 609 |
|
---|
| 610 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 611 | if (DebugOpt) {
|
---|
| 612 | crondlog("\111 Command %s\n", ptr);
|
---|
| 613 | }
|
---|
| 614 | #endif
|
---|
| 615 |
|
---|
| 616 | pline = &((*pline)->cl_Next);
|
---|
| 617 | }
|
---|
| 618 | *pline = NULL;
|
---|
| 619 |
|
---|
| 620 | file->cf_Next = FileBase;
|
---|
| 621 | FileBase = file;
|
---|
| 622 |
|
---|
| 623 | if (maxLines == 0 || maxEntries == 0) {
|
---|
| 624 | crondlog("\111Maximum number of lines reached for user %s\n", fileName);
|
---|
| 625 | }
|
---|
| 626 | }
|
---|
| 627 | fclose(fi);
|
---|
| 628 | }
|
---|
| 629 | }
|
---|
| 630 | }
|
---|
| 631 |
|
---|
| 632 | static void CheckUpdates(void)
|
---|
| 633 | {
|
---|
| 634 | FILE *fi;
|
---|
| 635 | char buf[256];
|
---|
| 636 |
|
---|
| 637 | fi = fopen(CRONUPDATE, "r");
|
---|
| 638 | if (fi != NULL) {
|
---|
| 639 | remove(CRONUPDATE);
|
---|
| 640 | while (fgets(buf, sizeof(buf), fi) != NULL) {
|
---|
| 641 | SynchronizeFile(strtok(buf, " \t\r\n"));
|
---|
| 642 | }
|
---|
| 643 | fclose(fi);
|
---|
| 644 | }
|
---|
| 645 | }
|
---|
| 646 |
|
---|
| 647 | static void SynchronizeDir(void)
|
---|
| 648 | {
|
---|
| 649 | /* Attempt to delete the database. */
|
---|
| 650 |
|
---|
| 651 | for (;;) {
|
---|
| 652 | CronFile *file;
|
---|
| 653 |
|
---|
| 654 | for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next);
|
---|
| 655 | if (file == NULL) {
|
---|
| 656 | break;
|
---|
| 657 | }
|
---|
| 658 | DeleteFile(file->cf_User);
|
---|
| 659 | }
|
---|
| 660 |
|
---|
| 661 | /*
|
---|
| 662 | * Remove cron update file
|
---|
| 663 | *
|
---|
| 664 | * Re-chdir, in case directory was renamed & deleted, or otherwise
|
---|
| 665 | * screwed up.
|
---|
| 666 | *
|
---|
| 667 | * scan directory and add associated users
|
---|
| 668 | */
|
---|
| 669 |
|
---|
| 670 | remove(CRONUPDATE);
|
---|
| 671 | if (chdir(CDir) < 0) {
|
---|
| 672 | crondlog("\311unable to find %s\n", CDir);
|
---|
| 673 | }
|
---|
| 674 | {
|
---|
| 675 | DIR *dir = opendir(".");
|
---|
| 676 | struct dirent *den;
|
---|
| 677 |
|
---|
| 678 | if (dir) {
|
---|
| 679 | while ((den = readdir(dir))) {
|
---|
| 680 | if (strchr(den->d_name, '.') != NULL) {
|
---|
| 681 | continue;
|
---|
| 682 | }
|
---|
| 683 | if (getpwnam(den->d_name)) {
|
---|
| 684 | SynchronizeFile(den->d_name);
|
---|
| 685 | } else {
|
---|
| 686 | crondlog("\007ignoring %s\n", den->d_name);
|
---|
| 687 | }
|
---|
| 688 | }
|
---|
| 689 | closedir(dir);
|
---|
| 690 | } else {
|
---|
| 691 | crondlog("\311Unable to open current dir!\n");
|
---|
| 692 | }
|
---|
| 693 | }
|
---|
| 694 | }
|
---|
| 695 |
|
---|
| 696 |
|
---|
| 697 | /*
|
---|
| 698 | * DeleteFile() - delete user database
|
---|
| 699 | *
|
---|
| 700 | * Note: multiple entries for same user may exist if we were unable to
|
---|
| 701 | * completely delete a database due to running processes.
|
---|
| 702 | */
|
---|
| 703 |
|
---|
| 704 | static void DeleteFile(const char *userName)
|
---|
| 705 | {
|
---|
| 706 | CronFile **pfile = &FileBase;
|
---|
| 707 | CronFile *file;
|
---|
| 708 |
|
---|
| 709 | while ((file = *pfile) != NULL) {
|
---|
| 710 | if (strcmp(userName, file->cf_User) == 0) {
|
---|
| 711 | CronLine **pline = &file->cf_LineBase;
|
---|
| 712 | CronLine *line;
|
---|
| 713 |
|
---|
| 714 | file->cf_Running = 0;
|
---|
| 715 | file->cf_Deleted = 1;
|
---|
| 716 |
|
---|
| 717 | while ((line = *pline) != NULL) {
|
---|
| 718 | if (line->cl_Pid > 0) {
|
---|
| 719 | file->cf_Running = 1;
|
---|
| 720 | pline = &line->cl_Next;
|
---|
| 721 | } else {
|
---|
| 722 | *pline = line->cl_Next;
|
---|
| 723 | free(line->cl_Shell);
|
---|
| 724 | free(line);
|
---|
| 725 | }
|
---|
| 726 | }
|
---|
| 727 | if (file->cf_Running == 0) {
|
---|
| 728 | *pfile = file->cf_Next;
|
---|
| 729 | free(file->cf_User);
|
---|
| 730 | free(file);
|
---|
| 731 | } else {
|
---|
| 732 | pfile = &file->cf_Next;
|
---|
| 733 | }
|
---|
| 734 | } else {
|
---|
| 735 | pfile = &file->cf_Next;
|
---|
| 736 | }
|
---|
| 737 | }
|
---|
| 738 | }
|
---|
| 739 |
|
---|
| 740 | /*
|
---|
| 741 | * TestJobs()
|
---|
| 742 | *
|
---|
| 743 | * determine which jobs need to be run. Under normal conditions, the
|
---|
| 744 | * period is about a minute (one scan). Worst case it will be one
|
---|
| 745 | * hour (60 scans).
|
---|
| 746 | */
|
---|
| 747 |
|
---|
| 748 | static int TestJobs(time_t t1, time_t t2)
|
---|
| 749 | {
|
---|
| 750 | int nJobs = 0;
|
---|
| 751 | time_t t;
|
---|
| 752 |
|
---|
| 753 | /* Find jobs > t1 and <= t2 */
|
---|
| 754 |
|
---|
| 755 | for (t = t1 - t1 % 60; t <= t2; t += 60) {
|
---|
| 756 | if (t > t1) {
|
---|
| 757 | struct tm *tp = localtime(&t);
|
---|
| 758 | CronFile *file;
|
---|
| 759 | CronLine *line;
|
---|
| 760 |
|
---|
| 761 | for (file = FileBase; file; file = file->cf_Next) {
|
---|
| 762 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 763 | if (DebugOpt)
|
---|
| 764 | crondlog("\005FILE %s:\n", file->cf_User);
|
---|
| 765 | #endif
|
---|
| 766 | if (file->cf_Deleted)
|
---|
| 767 | continue;
|
---|
| 768 | for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
---|
| 769 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 770 | if (DebugOpt)
|
---|
| 771 | crondlog("\005 LINE %s\n", line->cl_Shell);
|
---|
| 772 | #endif
|
---|
| 773 | if (line->cl_Mins[tp->tm_min] && line->cl_Hrs[tp->tm_hour] &&
|
---|
| 774 | (line->cl_Days[tp->tm_mday] || line->cl_Dow[tp->tm_wday])
|
---|
| 775 | && line->cl_Mons[tp->tm_mon]) {
|
---|
| 776 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 777 | if (DebugOpt) {
|
---|
| 778 | crondlog("\005 JobToDo: %d %s\n",
|
---|
| 779 | line->cl_Pid, line->cl_Shell);
|
---|
| 780 | }
|
---|
| 781 | #endif
|
---|
| 782 | if (line->cl_Pid > 0) {
|
---|
| 783 | crondlog("\010 process already running: %s %s\n",
|
---|
| 784 | file->cf_User, line->cl_Shell);
|
---|
| 785 | } else if (line->cl_Pid == 0) {
|
---|
| 786 | line->cl_Pid = -1;
|
---|
| 787 | file->cf_Ready = 1;
|
---|
| 788 | ++nJobs;
|
---|
| 789 | }
|
---|
| 790 | }
|
---|
| 791 | }
|
---|
| 792 | }
|
---|
| 793 | }
|
---|
| 794 | }
|
---|
| 795 | return (nJobs);
|
---|
| 796 | }
|
---|
| 797 |
|
---|
| 798 | static void RunJobs(void)
|
---|
| 799 | {
|
---|
| 800 | CronFile *file;
|
---|
| 801 | CronLine *line;
|
---|
| 802 |
|
---|
| 803 | for (file = FileBase; file; file = file->cf_Next) {
|
---|
| 804 | if (file->cf_Ready) {
|
---|
| 805 | file->cf_Ready = 0;
|
---|
| 806 |
|
---|
| 807 | for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
---|
| 808 | if (line->cl_Pid < 0) {
|
---|
| 809 |
|
---|
| 810 | RunJob(file->cf_User, line);
|
---|
| 811 |
|
---|
| 812 | crondlog("\010USER %s pid %3d cmd %s\n",
|
---|
| 813 | file->cf_User, line->cl_Pid, line->cl_Shell);
|
---|
| 814 | if (line->cl_Pid < 0) {
|
---|
| 815 | file->cf_Ready = 1;
|
---|
| 816 | }
|
---|
| 817 | else if (line->cl_Pid > 0) {
|
---|
| 818 | file->cf_Running = 1;
|
---|
| 819 | }
|
---|
| 820 | }
|
---|
| 821 | }
|
---|
| 822 | }
|
---|
| 823 | }
|
---|
| 824 | }
|
---|
| 825 |
|
---|
| 826 | /*
|
---|
| 827 | * CheckJobs() - check for job completion
|
---|
| 828 | *
|
---|
| 829 | * Check for job completion, return number of jobs still running after
|
---|
| 830 | * all done.
|
---|
| 831 | */
|
---|
| 832 |
|
---|
| 833 | static int CheckJobs(void)
|
---|
| 834 | {
|
---|
| 835 | CronFile *file;
|
---|
| 836 | CronLine *line;
|
---|
| 837 | int nStillRunning = 0;
|
---|
| 838 |
|
---|
| 839 | for (file = FileBase; file; file = file->cf_Next) {
|
---|
| 840 | if (file->cf_Running) {
|
---|
| 841 | file->cf_Running = 0;
|
---|
| 842 |
|
---|
| 843 | for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
---|
| 844 | if (line->cl_Pid > 0) {
|
---|
| 845 | int status;
|
---|
| 846 | int r = wait4(line->cl_Pid, &status, WNOHANG, NULL);
|
---|
| 847 |
|
---|
| 848 | if (r < 0 || r == line->cl_Pid) {
|
---|
| 849 | EndJob(file->cf_User, line);
|
---|
| 850 | if (line->cl_Pid) {
|
---|
| 851 | file->cf_Running = 1;
|
---|
| 852 | }
|
---|
| 853 | } else if (r == 0) {
|
---|
| 854 | file->cf_Running = 1;
|
---|
| 855 | }
|
---|
| 856 | }
|
---|
| 857 | }
|
---|
| 858 | }
|
---|
| 859 | nStillRunning += file->cf_Running;
|
---|
| 860 | }
|
---|
| 861 | return (nStillRunning);
|
---|
| 862 | }
|
---|
| 863 |
|
---|
| 864 |
|
---|
| 865 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
| 866 | static void
|
---|
| 867 | ForkJob(const char *user, CronLine * line, int mailFd,
|
---|
| 868 | const char *prog, const char *cmd, const char *arg, const char *mailf)
|
---|
| 869 | {
|
---|
| 870 | /* Fork as the user in question and run program */
|
---|
| 871 | pid_t pid = fork();
|
---|
| 872 |
|
---|
| 873 | line->cl_Pid = pid;
|
---|
| 874 | if (pid == 0) {
|
---|
| 875 | /* CHILD */
|
---|
| 876 |
|
---|
| 877 | /* Change running state to the user in question */
|
---|
| 878 |
|
---|
| 879 | if (ChangeUser(user) < 0) {
|
---|
| 880 | exit(0);
|
---|
| 881 | }
|
---|
| 882 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 883 | if (DebugOpt) {
|
---|
| 884 | crondlog("\005Child Running %s\n", prog);
|
---|
| 885 | }
|
---|
| 886 | #endif
|
---|
| 887 |
|
---|
| 888 | if (mailFd >= 0) {
|
---|
| 889 | dup2(mailFd, mailf != NULL);
|
---|
| 890 | dup2((mailf ? mailFd : 1), 2);
|
---|
| 891 | close(mailFd);
|
---|
| 892 | }
|
---|
| 893 | execl(prog, prog, cmd, arg, NULL);
|
---|
| 894 | crondlog("\024unable to exec, user %s cmd %s %s %s\n", user, prog, cmd, arg);
|
---|
| 895 | if (mailf) {
|
---|
| 896 | fdprintf(1, "Exec failed: %s -c %s\n", prog, arg);
|
---|
| 897 | }
|
---|
| 898 | exit(0);
|
---|
| 899 | } else if (pid < 0) {
|
---|
| 900 | /* FORK FAILED */
|
---|
| 901 | crondlog("\024couldn't fork, user %s\n", user);
|
---|
| 902 | line->cl_Pid = 0;
|
---|
| 903 | if (mailf) {
|
---|
| 904 | remove(mailf);
|
---|
| 905 | }
|
---|
| 906 | } else if (mailf) {
|
---|
| 907 | /* PARENT, FORK SUCCESS
|
---|
| 908 | * rename mail-file based on pid of process
|
---|
| 909 | */
|
---|
| 910 | char mailFile2[128];
|
---|
| 911 |
|
---|
| 912 | snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d", user, pid);
|
---|
| 913 | rename(mailf, mailFile2);
|
---|
| 914 | }
|
---|
| 915 | /*
|
---|
| 916 | * Close the mail file descriptor.. we can't just leave it open in
|
---|
| 917 | * a structure, closing it later, because we might run out of descriptors
|
---|
| 918 | */
|
---|
| 919 |
|
---|
| 920 | if (mailFd >= 0) {
|
---|
| 921 | close(mailFd);
|
---|
| 922 | }
|
---|
| 923 | }
|
---|
| 924 |
|
---|
| 925 | static void RunJob(const char *user, CronLine * line)
|
---|
| 926 | {
|
---|
| 927 | char mailFile[128];
|
---|
| 928 | int mailFd;
|
---|
| 929 |
|
---|
| 930 | line->cl_Pid = 0;
|
---|
| 931 | line->cl_MailFlag = 0;
|
---|
| 932 |
|
---|
| 933 | /* open mail file - owner root so nobody can screw with it. */
|
---|
| 934 |
|
---|
| 935 | snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d", user, getpid());
|
---|
| 936 | mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
|
---|
| 937 |
|
---|
| 938 | if (mailFd >= 0) {
|
---|
| 939 | line->cl_MailFlag = 1;
|
---|
| 940 | fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", user,
|
---|
| 941 | line->cl_Shell);
|
---|
| 942 | line->cl_MailPos = lseek(mailFd, 0, 1);
|
---|
| 943 | } else {
|
---|
| 944 | crondlog("\024unable to create mail file user %s file %s, output to /dev/null\n", user, mailFile);
|
---|
| 945 | }
|
---|
| 946 |
|
---|
| 947 | ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
|
---|
| 948 | }
|
---|
| 949 |
|
---|
| 950 | /*
|
---|
| 951 | * EndJob - called when job terminates and when mail terminates
|
---|
| 952 | */
|
---|
| 953 |
|
---|
| 954 | static void EndJob(const char *user, CronLine * line)
|
---|
| 955 | {
|
---|
| 956 | int mailFd;
|
---|
| 957 | char mailFile[128];
|
---|
| 958 | struct stat sbuf;
|
---|
| 959 |
|
---|
| 960 | /* No job */
|
---|
| 961 |
|
---|
| 962 | if (line->cl_Pid <= 0) {
|
---|
| 963 | line->cl_Pid = 0;
|
---|
| 964 | return;
|
---|
| 965 | }
|
---|
| 966 |
|
---|
| 967 | /*
|
---|
| 968 | * End of job and no mail file
|
---|
| 969 | * End of sendmail job
|
---|
| 970 | */
|
---|
| 971 |
|
---|
| 972 | snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d", user, line->cl_Pid);
|
---|
| 973 | line->cl_Pid = 0;
|
---|
| 974 |
|
---|
| 975 | if (line->cl_MailFlag != 1) {
|
---|
| 976 | return;
|
---|
| 977 | }
|
---|
| 978 | line->cl_MailFlag = 0;
|
---|
| 979 |
|
---|
| 980 | /*
|
---|
| 981 | * End of primary job - check for mail file. If size has increased and
|
---|
| 982 | * the file is still valid, we sendmail it.
|
---|
| 983 | */
|
---|
| 984 |
|
---|
| 985 | mailFd = open(mailFile, O_RDONLY);
|
---|
| 986 | remove(mailFile);
|
---|
| 987 | if (mailFd < 0) {
|
---|
| 988 | return;
|
---|
| 989 | }
|
---|
| 990 |
|
---|
| 991 | if (fstat(mailFd, &sbuf) < 0 || sbuf.st_uid != DaemonUid || sbuf.st_nlink != 0 ||
|
---|
| 992 | sbuf.st_size == line->cl_MailPos || !S_ISREG(sbuf.st_mode)) {
|
---|
| 993 | close(mailFd);
|
---|
| 994 | return;
|
---|
| 995 | }
|
---|
| 996 | ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
|
---|
| 997 | }
|
---|
| 998 | #else
|
---|
| 999 | /* crond without sendmail */
|
---|
| 1000 |
|
---|
| 1001 | static void RunJob(const char *user, CronLine * line)
|
---|
| 1002 | {
|
---|
| 1003 | /* Fork as the user in question and run program */
|
---|
| 1004 | pid_t pid = fork();
|
---|
| 1005 |
|
---|
| 1006 | if (pid == 0) {
|
---|
| 1007 | /* CHILD */
|
---|
| 1008 |
|
---|
| 1009 | /* Change running state to the user in question */
|
---|
| 1010 |
|
---|
| 1011 | if (ChangeUser(user) < 0) {
|
---|
| 1012 | exit(0);
|
---|
| 1013 | }
|
---|
| 1014 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 1015 | if (DebugOpt) {
|
---|
| 1016 | crondlog("\005Child Running %s\n", DEFAULT_SHELL);
|
---|
| 1017 | }
|
---|
| 1018 | #endif
|
---|
| 1019 |
|
---|
| 1020 | execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_Shell, NULL);
|
---|
| 1021 | crondlog("\024unable to exec, user %s cmd %s -c %s\n", user,
|
---|
| 1022 | DEFAULT_SHELL, line->cl_Shell);
|
---|
| 1023 | exit(0);
|
---|
| 1024 | } else if (pid < 0) {
|
---|
| 1025 | /* FORK FAILED */
|
---|
| 1026 | crondlog("\024couldn't fork, user %s\n", user);
|
---|
| 1027 | pid = 0;
|
---|
| 1028 | }
|
---|
| 1029 | line->cl_Pid = pid;
|
---|
| 1030 | }
|
---|
| 1031 | #endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|