[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * crond -d[#] -c <crondir> -f -b
|
---|
| 4 | *
|
---|
| 5 | * run as root, but NOT setuid root
|
---|
| 6 | *
|
---|
| 7 | * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
|
---|
[1770] | 8 | * (version 2.3.2)
|
---|
[821] | 9 | * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
|
---|
| 10 | *
|
---|
| 11 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
---|
| 12 | */
|
---|
| 13 |
|
---|
[1770] | 14 | #include <sys/syslog.h>
|
---|
| 15 | #include "libbb.h"
|
---|
[821] | 16 |
|
---|
| 17 | #ifndef CRONTABS
|
---|
| 18 | #define CRONTABS "/var/spool/cron/crontabs"
|
---|
| 19 | #endif
|
---|
| 20 | #ifndef TMPDIR
|
---|
| 21 | #define TMPDIR "/var/spool/cron"
|
---|
| 22 | #endif
|
---|
| 23 | #ifndef SENDMAIL
|
---|
[1770] | 24 | #define SENDMAIL "sendmail"
|
---|
[821] | 25 | #endif
|
---|
| 26 | #ifndef SENDMAIL_ARGS
|
---|
| 27 | #define SENDMAIL_ARGS "-ti", "oem"
|
---|
| 28 | #endif
|
---|
| 29 | #ifndef CRONUPDATE
|
---|
| 30 | #define CRONUPDATE "cron.update"
|
---|
| 31 | #endif
|
---|
| 32 | #ifndef MAXLINES
|
---|
| 33 | #define MAXLINES 256 /* max lines in non-root crontabs */
|
---|
| 34 | #endif
|
---|
| 35 |
|
---|
| 36 | typedef struct CronFile {
|
---|
| 37 | struct CronFile *cf_Next;
|
---|
| 38 | struct CronLine *cf_LineBase;
|
---|
| 39 | char *cf_User; /* username */
|
---|
| 40 | int cf_Ready; /* bool: one or more jobs ready */
|
---|
| 41 | int cf_Running; /* bool: one or more jobs running */
|
---|
| 42 | int cf_Deleted; /* marked for deletion, ignore */
|
---|
| 43 | } CronFile;
|
---|
| 44 |
|
---|
| 45 | typedef struct CronLine {
|
---|
| 46 | struct CronLine *cl_Next;
|
---|
| 47 | char *cl_Shell; /* shell command */
|
---|
| 48 | pid_t cl_Pid; /* running pid, 0, or armed (-1) */
|
---|
| 49 | int cl_MailFlag; /* running pid is for mail */
|
---|
| 50 | int cl_MailPos; /* 'empty file' size */
|
---|
| 51 | char cl_Mins[60]; /* 0-59 */
|
---|
| 52 | char cl_Hrs[24]; /* 0-23 */
|
---|
| 53 | char cl_Days[32]; /* 1-31 */
|
---|
| 54 | char cl_Mons[12]; /* 0-11 */
|
---|
| 55 | char cl_Dow[7]; /* 0-6, beginning sunday */
|
---|
| 56 | } CronLine;
|
---|
| 57 |
|
---|
| 58 | #define RUN_RANOUT 1
|
---|
| 59 | #define RUN_RUNNING 2
|
---|
| 60 | #define RUN_FAILED 3
|
---|
| 61 |
|
---|
| 62 | #define DaemonUid 0
|
---|
| 63 |
|
---|
| 64 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
[1770] | 65 | static unsigned DebugOpt;
|
---|
[821] | 66 | #endif
|
---|
| 67 |
|
---|
[1770] | 68 | static unsigned LogLevel = 8;
|
---|
[821] | 69 | static const char *LogFile;
|
---|
| 70 | static const char *CDir = CRONTABS;
|
---|
| 71 |
|
---|
| 72 | static void startlogger(void);
|
---|
| 73 |
|
---|
| 74 | static void CheckUpdates(void);
|
---|
| 75 | static void SynchronizeDir(void);
|
---|
| 76 | static int TestJobs(time_t t1, time_t t2);
|
---|
| 77 | static void RunJobs(void);
|
---|
| 78 | static int CheckJobs(void);
|
---|
| 79 |
|
---|
| 80 | static void RunJob(const char *user, CronLine * line);
|
---|
| 81 |
|
---|
| 82 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
| 83 | static void EndJob(const char *user, CronLine * line);
|
---|
| 84 | #else
|
---|
| 85 | #define EndJob(user, line) line->cl_Pid = 0
|
---|
| 86 | #endif
|
---|
| 87 |
|
---|
| 88 | static void DeleteFile(const char *userName);
|
---|
| 89 |
|
---|
| 90 | static CronFile *FileBase;
|
---|
| 91 |
|
---|
| 92 |
|
---|
| 93 | static void crondlog(const char *ctl, ...)
|
---|
| 94 | {
|
---|
| 95 | va_list va;
|
---|
| 96 | const char *fmt;
|
---|
| 97 | int level = (int) (ctl[0] & 0xf);
|
---|
| 98 | int type = level == 20 ?
|
---|
| 99 | LOG_ERR : ((ctl[0] & 0100) ? LOG_WARNING : LOG_NOTICE);
|
---|
| 100 |
|
---|
| 101 |
|
---|
| 102 | va_start(va, ctl);
|
---|
| 103 | fmt = ctl + 1;
|
---|
| 104 | if (level >= LogLevel) {
|
---|
| 105 |
|
---|
| 106 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 107 | if (DebugOpt) {
|
---|
| 108 | vfprintf(stderr, fmt, va);
|
---|
| 109 | } else
|
---|
| 110 | #endif
|
---|
| 111 | if (LogFile == 0) {
|
---|
| 112 | vsyslog(type, fmt, va);
|
---|
| 113 | } else {
|
---|
[1770] | 114 | #if !ENABLE_DEBUG_CROND_OPTION
|
---|
[821] | 115 | int logfd = open(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
|
---|
[1770] | 116 | #else
|
---|
| 117 | int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
|
---|
| 118 | #endif
|
---|
[821] | 119 | if (logfd >= 0) {
|
---|
| 120 | vdprintf(logfd, fmt, va);
|
---|
| 121 | close(logfd);
|
---|
| 122 | }
|
---|
| 123 | }
|
---|
| 124 | }
|
---|
| 125 | va_end(va);
|
---|
| 126 | if (ctl[0] & 0200) {
|
---|
| 127 | exit(20);
|
---|
| 128 | }
|
---|
| 129 | }
|
---|
| 130 |
|
---|
[1770] | 131 | int crond_main(int ac, char **av);
|
---|
[821] | 132 | int crond_main(int ac, char **av)
|
---|
| 133 | {
|
---|
[1770] | 134 | unsigned opt;
|
---|
[821] | 135 | char *lopt, *Lopt, *copt;
|
---|
[1770] | 136 | USE_DEBUG_CROND_OPTION(char *dopt;)
|
---|
[821] | 137 |
|
---|
[1770] | 138 | opt_complementary = "f-b:b-f:S-L:L-S" USE_DEBUG_CROND_OPTION(":d-l");
|
---|
[821] | 139 | opterr = 0; /* disable getopt 'errors' message. */
|
---|
[1770] | 140 | opt = getopt32(av, "l:L:fbSc:" USE_DEBUG_CROND_OPTION("d:"),
|
---|
| 141 | &lopt, &Lopt, &copt USE_DEBUG_CROND_OPTION(, &dopt));
|
---|
| 142 | if (opt & 1) /* -l */
|
---|
| 143 | LogLevel = xatou(lopt);
|
---|
| 144 | if (opt & 2) /* -L */
|
---|
| 145 | if (*Lopt)
|
---|
[821] | 146 | LogFile = Lopt;
|
---|
[1770] | 147 | if (opt & 32) /* -c */
|
---|
| 148 | if (*copt)
|
---|
[821] | 149 | CDir = copt;
|
---|
| 150 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
[1770] | 151 | if (opt & 64) { /* -d */
|
---|
| 152 | DebugOpt = xatou(dopt);
|
---|
[821] | 153 | LogLevel = 0;
|
---|
| 154 | }
|
---|
| 155 | #endif
|
---|
| 156 |
|
---|
[1770] | 157 | /* close stdin and stdout, stderr.
|
---|
[821] | 158 | * close unused descriptors - don't need.
|
---|
| 159 | * optional detach from controlling terminal
|
---|
| 160 | */
|
---|
[1770] | 161 | if (!(opt & 4))
|
---|
| 162 | bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, av);
|
---|
[821] | 163 |
|
---|
[1770] | 164 | xchdir(CDir);
|
---|
| 165 | signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
|
---|
[821] | 166 |
|
---|
[1770] | 167 | startlogger(); /* need if syslog mode selected */
|
---|
[821] | 168 |
|
---|
| 169 | /*
|
---|
| 170 | * main loop - synchronize to 1 second after the minute, minimum sleep
|
---|
| 171 | * of 1 second.
|
---|
| 172 | */
|
---|
[1770] | 173 | crondlog("\011%s " BB_VER " started, log level %d\n",
|
---|
| 174 | applet_name, LogLevel);
|
---|
[821] | 175 |
|
---|
| 176 | SynchronizeDir();
|
---|
| 177 |
|
---|
| 178 | {
|
---|
| 179 | time_t t1 = time(NULL);
|
---|
| 180 | time_t t2;
|
---|
| 181 | long dt;
|
---|
| 182 | int rescan = 60;
|
---|
| 183 | short sleep_time = 60;
|
---|
| 184 |
|
---|
[1770] | 185 | write_pidfile("/var/run/crond.pid");
|
---|
[821] | 186 | for (;;) {
|
---|
| 187 | sleep((sleep_time + 1) - (short) (time(NULL) % sleep_time));
|
---|
| 188 |
|
---|
| 189 | t2 = time(NULL);
|
---|
| 190 | dt = t2 - t1;
|
---|
| 191 |
|
---|
| 192 | /*
|
---|
| 193 | * The file 'cron.update' is checked to determine new cron
|
---|
| 194 | * jobs. The directory is rescanned once an hour to deal
|
---|
| 195 | * with any screwups.
|
---|
| 196 | *
|
---|
| 197 | * check for disparity. Disparities over an hour either way
|
---|
| 198 | * result in resynchronization. A reverse-indexed disparity
|
---|
| 199 | * less then an hour causes us to effectively sleep until we
|
---|
| 200 | * match the original time (i.e. no re-execution of jobs that
|
---|
| 201 | * have just been run). A forward-indexed disparity less then
|
---|
| 202 | * an hour causes intermediate jobs to be run, but only once
|
---|
| 203 | * in the worst case.
|
---|
| 204 | *
|
---|
| 205 | * when running jobs, the inequality used is greater but not
|
---|
| 206 | * equal to t1, and less then or equal to t2.
|
---|
| 207 | */
|
---|
| 208 |
|
---|
| 209 | if (--rescan == 0) {
|
---|
| 210 | rescan = 60;
|
---|
| 211 | SynchronizeDir();
|
---|
| 212 | }
|
---|
| 213 | CheckUpdates();
|
---|
| 214 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 215 | if (DebugOpt)
|
---|
| 216 | crondlog("\005Wakeup dt=%d\n", dt);
|
---|
| 217 | #endif
|
---|
| 218 | if (dt < -60 * 60 || dt > 60 * 60) {
|
---|
| 219 | t1 = t2;
|
---|
| 220 | crondlog("\111time disparity of %d minutes detected\n", dt / 60);
|
---|
| 221 | } else if (dt > 0) {
|
---|
| 222 | TestJobs(t1, t2);
|
---|
| 223 | RunJobs();
|
---|
| 224 | sleep(5);
|
---|
| 225 | if (CheckJobs() > 0) {
|
---|
| 226 | sleep_time = 10;
|
---|
| 227 | } else {
|
---|
| 228 | sleep_time = 60;
|
---|
| 229 | }
|
---|
| 230 | t1 = t2;
|
---|
| 231 | }
|
---|
| 232 | }
|
---|
| 233 | }
|
---|
[1770] | 234 | return 0; /* not reached */
|
---|
[821] | 235 | }
|
---|
| 236 |
|
---|
| 237 | static int ChangeUser(const char *user)
|
---|
| 238 | {
|
---|
| 239 | struct passwd *pas;
|
---|
| 240 | const char *err_msg;
|
---|
| 241 |
|
---|
| 242 | /*
|
---|
| 243 | * Obtain password entry and change privileges
|
---|
| 244 | */
|
---|
| 245 | pas = getpwnam(user);
|
---|
| 246 | if (pas == 0) {
|
---|
| 247 | crondlog("\011failed to get uid for %s", user);
|
---|
[1770] | 248 | return -1;
|
---|
[821] | 249 | }
|
---|
| 250 | setenv("USER", pas->pw_name, 1);
|
---|
| 251 | setenv("HOME", pas->pw_dir, 1);
|
---|
| 252 | setenv("SHELL", DEFAULT_SHELL, 1);
|
---|
| 253 |
|
---|
| 254 | /*
|
---|
| 255 | * Change running state to the user in question
|
---|
| 256 | */
|
---|
| 257 | err_msg = change_identity_e2str(pas);
|
---|
| 258 | if (err_msg) {
|
---|
| 259 | crondlog("\011%s for user %s", err_msg, user);
|
---|
[1770] | 260 | return -1;
|
---|
[821] | 261 | }
|
---|
| 262 | if (chdir(pas->pw_dir) < 0) {
|
---|
| 263 | crondlog("\011chdir failed: %s: %m", pas->pw_dir);
|
---|
| 264 | if (chdir(TMPDIR) < 0) {
|
---|
| 265 | crondlog("\011chdir failed: %s: %m", TMPDIR);
|
---|
[1770] | 266 | return -1;
|
---|
[821] | 267 | }
|
---|
| 268 | }
|
---|
[1770] | 269 | return pas->pw_uid;
|
---|
[821] | 270 | }
|
---|
| 271 |
|
---|
| 272 | static void startlogger(void)
|
---|
| 273 | {
|
---|
| 274 | if (LogFile == 0) {
|
---|
[1770] | 275 | openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
|
---|
[821] | 276 | }
|
---|
| 277 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 278 | else { /* test logfile */
|
---|
| 279 | int logfd;
|
---|
| 280 |
|
---|
[1770] | 281 | logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
|
---|
| 282 | if (logfd >= 0) {
|
---|
[821] | 283 | close(logfd);
|
---|
| 284 | }
|
---|
| 285 | }
|
---|
| 286 | #endif
|
---|
| 287 | }
|
---|
| 288 |
|
---|
| 289 |
|
---|
[1770] | 290 | static const char DowAry[] ALIGN1 =
|
---|
| 291 | "sun""mon""tue""wed""thu""fri""sat"
|
---|
| 292 | /* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
|
---|
| 293 | ;
|
---|
[821] | 294 |
|
---|
[1770] | 295 | static const char MonAry[] ALIGN1 =
|
---|
| 296 | "jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
|
---|
| 297 | /* "Jan""Feb""Mar""Apr""May""Jun""Jul""Aug""Sep""Oct""Nov""Dec" */
|
---|
| 298 | ;
|
---|
[821] | 299 |
|
---|
| 300 | static char *ParseField(char *user, char *ary, int modvalue, int off,
|
---|
[1770] | 301 | const char *names, char *ptr)
|
---|
| 302 | /* 'names' is a pointer to a set of 3-char abbreviations */
|
---|
[821] | 303 | {
|
---|
| 304 | char *base = ptr;
|
---|
| 305 | int n1 = -1;
|
---|
| 306 | int n2 = -1;
|
---|
| 307 |
|
---|
| 308 | if (base == NULL) {
|
---|
[1770] | 309 | return NULL;
|
---|
[821] | 310 | }
|
---|
| 311 |
|
---|
| 312 | while (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
|
---|
| 313 | int skip = 0;
|
---|
| 314 |
|
---|
| 315 | /* Handle numeric digit or symbol or '*' */
|
---|
| 316 |
|
---|
| 317 | if (*ptr == '*') {
|
---|
| 318 | n1 = 0; /* everything will be filled */
|
---|
| 319 | n2 = modvalue - 1;
|
---|
| 320 | skip = 1;
|
---|
| 321 | ++ptr;
|
---|
| 322 | } else if (*ptr >= '0' && *ptr <= '9') {
|
---|
| 323 | if (n1 < 0) {
|
---|
| 324 | n1 = strtol(ptr, &ptr, 10) + off;
|
---|
| 325 | } else {
|
---|
| 326 | n2 = strtol(ptr, &ptr, 10) + off;
|
---|
| 327 | }
|
---|
| 328 | skip = 1;
|
---|
| 329 | } else if (names) {
|
---|
| 330 | int i;
|
---|
| 331 |
|
---|
[1770] | 332 | for (i = 0; names[i]; i += 3) {
|
---|
| 333 | /* was using strncmp before... */
|
---|
| 334 | if (strncasecmp(ptr, &names[i], 3) == 0) {
|
---|
| 335 | ptr += 3;
|
---|
| 336 | if (n1 < 0) {
|
---|
| 337 | n1 = i / 3;
|
---|
| 338 | } else {
|
---|
| 339 | n2 = i / 3;
|
---|
| 340 | }
|
---|
| 341 | skip = 1;
|
---|
[821] | 342 | break;
|
---|
| 343 | }
|
---|
| 344 | }
|
---|
| 345 | }
|
---|
| 346 |
|
---|
| 347 | /* handle optional range '-' */
|
---|
| 348 |
|
---|
| 349 | if (skip == 0) {
|
---|
| 350 | crondlog("\111failed user %s parsing %s\n", user, base);
|
---|
[1770] | 351 | return NULL;
|
---|
[821] | 352 | }
|
---|
| 353 | if (*ptr == '-' && n2 < 0) {
|
---|
| 354 | ++ptr;
|
---|
| 355 | continue;
|
---|
| 356 | }
|
---|
| 357 |
|
---|
| 358 | /*
|
---|
| 359 | * collapse single-value ranges, handle skipmark, and fill
|
---|
| 360 | * in the character array appropriately.
|
---|
| 361 | */
|
---|
| 362 |
|
---|
| 363 | if (n2 < 0) {
|
---|
| 364 | n2 = n1;
|
---|
| 365 | }
|
---|
| 366 | if (*ptr == '/') {
|
---|
| 367 | skip = strtol(ptr + 1, &ptr, 10);
|
---|
| 368 | }
|
---|
| 369 | /*
|
---|
| 370 | * fill array, using a failsafe is the easiest way to prevent
|
---|
| 371 | * an endless loop
|
---|
| 372 | */
|
---|
| 373 |
|
---|
| 374 | {
|
---|
| 375 | int s0 = 1;
|
---|
| 376 | int failsafe = 1024;
|
---|
| 377 |
|
---|
| 378 | --n1;
|
---|
| 379 | do {
|
---|
| 380 | n1 = (n1 + 1) % modvalue;
|
---|
| 381 |
|
---|
| 382 | if (--s0 == 0) {
|
---|
| 383 | ary[n1 % modvalue] = 1;
|
---|
| 384 | s0 = skip;
|
---|
| 385 | }
|
---|
| 386 | }
|
---|
| 387 | while (n1 != n2 && --failsafe);
|
---|
| 388 |
|
---|
| 389 | if (failsafe == 0) {
|
---|
| 390 | crondlog("\111failed user %s parsing %s\n", user, base);
|
---|
[1770] | 391 | return NULL;
|
---|
[821] | 392 | }
|
---|
| 393 | }
|
---|
| 394 | if (*ptr != ',') {
|
---|
| 395 | break;
|
---|
| 396 | }
|
---|
| 397 | ++ptr;
|
---|
| 398 | n1 = -1;
|
---|
| 399 | n2 = -1;
|
---|
| 400 | }
|
---|
| 401 |
|
---|
| 402 | if (*ptr != ' ' && *ptr != '\t' && *ptr != '\n') {
|
---|
| 403 | crondlog("\111failed user %s parsing %s\n", user, base);
|
---|
[1770] | 404 | return NULL;
|
---|
[821] | 405 | }
|
---|
| 406 |
|
---|
| 407 | while (*ptr == ' ' || *ptr == '\t' || *ptr == '\n') {
|
---|
| 408 | ++ptr;
|
---|
| 409 | }
|
---|
| 410 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 411 | if (DebugOpt) {
|
---|
| 412 | int i;
|
---|
| 413 |
|
---|
| 414 | for (i = 0; i < modvalue; ++i) {
|
---|
| 415 | crondlog("\005%d", ary[i]);
|
---|
| 416 | }
|
---|
| 417 | crondlog("\005\n");
|
---|
| 418 | }
|
---|
| 419 | #endif
|
---|
| 420 |
|
---|
[1770] | 421 | return ptr;
|
---|
[821] | 422 | }
|
---|
| 423 |
|
---|
| 424 | static void FixDayDow(CronLine * line)
|
---|
| 425 | {
|
---|
| 426 | int i;
|
---|
| 427 | int weekUsed = 0;
|
---|
| 428 | int daysUsed = 0;
|
---|
| 429 |
|
---|
[1770] | 430 | for (i = 0; i < (int)(ARRAY_SIZE(line->cl_Dow)); ++i) {
|
---|
[821] | 431 | if (line->cl_Dow[i] == 0) {
|
---|
| 432 | weekUsed = 1;
|
---|
| 433 | break;
|
---|
| 434 | }
|
---|
| 435 | }
|
---|
[1770] | 436 | for (i = 0; i < (int)(ARRAY_SIZE(line->cl_Days)); ++i) {
|
---|
[821] | 437 | if (line->cl_Days[i] == 0) {
|
---|
| 438 | daysUsed = 1;
|
---|
| 439 | break;
|
---|
| 440 | }
|
---|
| 441 | }
|
---|
| 442 | if (weekUsed && !daysUsed) {
|
---|
| 443 | memset(line->cl_Days, 0, sizeof(line->cl_Days));
|
---|
| 444 | }
|
---|
| 445 | if (daysUsed && !weekUsed) {
|
---|
| 446 | memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
|
---|
| 447 | }
|
---|
| 448 | }
|
---|
| 449 |
|
---|
| 450 |
|
---|
| 451 |
|
---|
| 452 | static void SynchronizeFile(const char *fileName)
|
---|
| 453 | {
|
---|
| 454 | int maxEntries = MAXLINES;
|
---|
| 455 | int maxLines;
|
---|
| 456 | char buf[1024];
|
---|
| 457 |
|
---|
| 458 | if (strcmp(fileName, "root") == 0) {
|
---|
| 459 | maxEntries = 65535;
|
---|
| 460 | }
|
---|
| 461 | maxLines = maxEntries * 10;
|
---|
| 462 |
|
---|
| 463 | if (fileName) {
|
---|
| 464 | FILE *fi;
|
---|
| 465 |
|
---|
| 466 | DeleteFile(fileName);
|
---|
| 467 |
|
---|
| 468 | fi = fopen(fileName, "r");
|
---|
| 469 | if (fi != NULL) {
|
---|
| 470 | struct stat sbuf;
|
---|
| 471 |
|
---|
| 472 | if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
|
---|
[1770] | 473 | CronFile *file = xzalloc(sizeof(CronFile));
|
---|
[821] | 474 | CronLine **pline;
|
---|
| 475 |
|
---|
| 476 | file->cf_User = strdup(fileName);
|
---|
| 477 | pline = &file->cf_LineBase;
|
---|
| 478 |
|
---|
| 479 | while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
|
---|
| 480 | CronLine line;
|
---|
| 481 | char *ptr;
|
---|
| 482 |
|
---|
| 483 | trim(buf);
|
---|
| 484 | if (buf[0] == 0 || buf[0] == '#') {
|
---|
| 485 | continue;
|
---|
| 486 | }
|
---|
| 487 | if (--maxEntries == 0) {
|
---|
| 488 | break;
|
---|
| 489 | }
|
---|
| 490 | memset(&line, 0, sizeof(line));
|
---|
| 491 |
|
---|
| 492 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 493 | if (DebugOpt) {
|
---|
| 494 | crondlog("\111User %s Entry %s\n", fileName, buf);
|
---|
| 495 | }
|
---|
| 496 | #endif
|
---|
| 497 |
|
---|
| 498 | /* parse date ranges */
|
---|
| 499 | ptr = ParseField(file->cf_User, line.cl_Mins, 60, 0, NULL, buf);
|
---|
| 500 | ptr = ParseField(file->cf_User, line.cl_Hrs, 24, 0, NULL, ptr);
|
---|
| 501 | ptr = ParseField(file->cf_User, line.cl_Days, 32, 0, NULL, ptr);
|
---|
| 502 | ptr = ParseField(file->cf_User, line.cl_Mons, 12, -1, MonAry, ptr);
|
---|
| 503 | ptr = ParseField(file->cf_User, line.cl_Dow, 7, 0, DowAry, ptr);
|
---|
| 504 |
|
---|
| 505 | /* check failure */
|
---|
| 506 | if (ptr == NULL) {
|
---|
| 507 | continue;
|
---|
| 508 | }
|
---|
| 509 |
|
---|
| 510 | /*
|
---|
| 511 | * fix days and dow - if one is not * and the other
|
---|
| 512 | * is *, the other is set to 0, and vise-versa
|
---|
| 513 | */
|
---|
| 514 |
|
---|
| 515 | FixDayDow(&line);
|
---|
| 516 |
|
---|
[1770] | 517 | *pline = xzalloc(sizeof(CronLine));
|
---|
[821] | 518 | **pline = line;
|
---|
| 519 |
|
---|
| 520 | /* copy command */
|
---|
| 521 | (*pline)->cl_Shell = strdup(ptr);
|
---|
| 522 |
|
---|
| 523 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 524 | if (DebugOpt) {
|
---|
| 525 | crondlog("\111 Command %s\n", ptr);
|
---|
| 526 | }
|
---|
| 527 | #endif
|
---|
| 528 |
|
---|
| 529 | pline = &((*pline)->cl_Next);
|
---|
| 530 | }
|
---|
| 531 | *pline = NULL;
|
---|
| 532 |
|
---|
| 533 | file->cf_Next = FileBase;
|
---|
| 534 | FileBase = file;
|
---|
| 535 |
|
---|
| 536 | if (maxLines == 0 || maxEntries == 0) {
|
---|
| 537 | crondlog("\111Maximum number of lines reached for user %s\n", fileName);
|
---|
| 538 | }
|
---|
| 539 | }
|
---|
| 540 | fclose(fi);
|
---|
| 541 | }
|
---|
| 542 | }
|
---|
| 543 | }
|
---|
| 544 |
|
---|
| 545 | static void CheckUpdates(void)
|
---|
| 546 | {
|
---|
| 547 | FILE *fi;
|
---|
| 548 | char buf[256];
|
---|
| 549 |
|
---|
| 550 | fi = fopen(CRONUPDATE, "r");
|
---|
| 551 | if (fi != NULL) {
|
---|
| 552 | remove(CRONUPDATE);
|
---|
| 553 | while (fgets(buf, sizeof(buf), fi) != NULL) {
|
---|
| 554 | SynchronizeFile(strtok(buf, " \t\r\n"));
|
---|
| 555 | }
|
---|
| 556 | fclose(fi);
|
---|
| 557 | }
|
---|
| 558 | }
|
---|
| 559 |
|
---|
| 560 | static void SynchronizeDir(void)
|
---|
| 561 | {
|
---|
| 562 | /* Attempt to delete the database. */
|
---|
| 563 |
|
---|
| 564 | for (;;) {
|
---|
| 565 | CronFile *file;
|
---|
| 566 |
|
---|
| 567 | for (file = FileBase; file && file->cf_Deleted; file = file->cf_Next);
|
---|
| 568 | if (file == NULL) {
|
---|
| 569 | break;
|
---|
| 570 | }
|
---|
| 571 | DeleteFile(file->cf_User);
|
---|
| 572 | }
|
---|
| 573 |
|
---|
| 574 | /*
|
---|
| 575 | * Remove cron update file
|
---|
| 576 | *
|
---|
| 577 | * Re-chdir, in case directory was renamed & deleted, or otherwise
|
---|
| 578 | * screwed up.
|
---|
| 579 | *
|
---|
| 580 | * scan directory and add associated users
|
---|
| 581 | */
|
---|
| 582 |
|
---|
| 583 | remove(CRONUPDATE);
|
---|
| 584 | if (chdir(CDir) < 0) {
|
---|
[1770] | 585 | crondlog("\311cannot find %s\n", CDir);
|
---|
[821] | 586 | }
|
---|
| 587 | {
|
---|
| 588 | DIR *dir = opendir(".");
|
---|
| 589 | struct dirent *den;
|
---|
| 590 |
|
---|
| 591 | if (dir) {
|
---|
| 592 | while ((den = readdir(dir))) {
|
---|
| 593 | if (strchr(den->d_name, '.') != NULL) {
|
---|
| 594 | continue;
|
---|
| 595 | }
|
---|
| 596 | if (getpwnam(den->d_name)) {
|
---|
| 597 | SynchronizeFile(den->d_name);
|
---|
| 598 | } else {
|
---|
| 599 | crondlog("\007ignoring %s\n", den->d_name);
|
---|
| 600 | }
|
---|
| 601 | }
|
---|
| 602 | closedir(dir);
|
---|
| 603 | } else {
|
---|
[1770] | 604 | crondlog("\311cannot open current dir!\n");
|
---|
[821] | 605 | }
|
---|
| 606 | }
|
---|
| 607 | }
|
---|
| 608 |
|
---|
| 609 |
|
---|
| 610 | /*
|
---|
| 611 | * DeleteFile() - delete user database
|
---|
| 612 | *
|
---|
| 613 | * Note: multiple entries for same user may exist if we were unable to
|
---|
| 614 | * completely delete a database due to running processes.
|
---|
| 615 | */
|
---|
| 616 |
|
---|
| 617 | static void DeleteFile(const char *userName)
|
---|
| 618 | {
|
---|
| 619 | CronFile **pfile = &FileBase;
|
---|
| 620 | CronFile *file;
|
---|
| 621 |
|
---|
| 622 | while ((file = *pfile) != NULL) {
|
---|
| 623 | if (strcmp(userName, file->cf_User) == 0) {
|
---|
| 624 | CronLine **pline = &file->cf_LineBase;
|
---|
| 625 | CronLine *line;
|
---|
| 626 |
|
---|
| 627 | file->cf_Running = 0;
|
---|
| 628 | file->cf_Deleted = 1;
|
---|
| 629 |
|
---|
| 630 | while ((line = *pline) != NULL) {
|
---|
| 631 | if (line->cl_Pid > 0) {
|
---|
| 632 | file->cf_Running = 1;
|
---|
| 633 | pline = &line->cl_Next;
|
---|
| 634 | } else {
|
---|
| 635 | *pline = line->cl_Next;
|
---|
| 636 | free(line->cl_Shell);
|
---|
| 637 | free(line);
|
---|
| 638 | }
|
---|
| 639 | }
|
---|
| 640 | if (file->cf_Running == 0) {
|
---|
| 641 | *pfile = file->cf_Next;
|
---|
| 642 | free(file->cf_User);
|
---|
| 643 | free(file);
|
---|
| 644 | } else {
|
---|
| 645 | pfile = &file->cf_Next;
|
---|
| 646 | }
|
---|
| 647 | } else {
|
---|
| 648 | pfile = &file->cf_Next;
|
---|
| 649 | }
|
---|
| 650 | }
|
---|
| 651 | }
|
---|
| 652 |
|
---|
| 653 | /*
|
---|
| 654 | * TestJobs()
|
---|
| 655 | *
|
---|
| 656 | * determine which jobs need to be run. Under normal conditions, the
|
---|
| 657 | * period is about a minute (one scan). Worst case it will be one
|
---|
| 658 | * hour (60 scans).
|
---|
| 659 | */
|
---|
| 660 |
|
---|
| 661 | static int TestJobs(time_t t1, time_t t2)
|
---|
| 662 | {
|
---|
| 663 | int nJobs = 0;
|
---|
| 664 | time_t t;
|
---|
| 665 |
|
---|
| 666 | /* Find jobs > t1 and <= t2 */
|
---|
| 667 |
|
---|
| 668 | for (t = t1 - t1 % 60; t <= t2; t += 60) {
|
---|
| 669 | if (t > t1) {
|
---|
| 670 | struct tm *tp = localtime(&t);
|
---|
| 671 | CronFile *file;
|
---|
| 672 | CronLine *line;
|
---|
| 673 |
|
---|
| 674 | for (file = FileBase; file; file = file->cf_Next) {
|
---|
| 675 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 676 | if (DebugOpt)
|
---|
| 677 | crondlog("\005FILE %s:\n", file->cf_User);
|
---|
| 678 | #endif
|
---|
| 679 | if (file->cf_Deleted)
|
---|
| 680 | continue;
|
---|
| 681 | for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
---|
| 682 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 683 | if (DebugOpt)
|
---|
| 684 | crondlog("\005 LINE %s\n", line->cl_Shell);
|
---|
| 685 | #endif
|
---|
| 686 | if (line->cl_Mins[tp->tm_min] && line->cl_Hrs[tp->tm_hour] &&
|
---|
| 687 | (line->cl_Days[tp->tm_mday] || line->cl_Dow[tp->tm_wday])
|
---|
| 688 | && line->cl_Mons[tp->tm_mon]) {
|
---|
| 689 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 690 | if (DebugOpt) {
|
---|
| 691 | crondlog("\005 JobToDo: %d %s\n",
|
---|
| 692 | line->cl_Pid, line->cl_Shell);
|
---|
| 693 | }
|
---|
| 694 | #endif
|
---|
| 695 | if (line->cl_Pid > 0) {
|
---|
| 696 | crondlog("\010 process already running: %s %s\n",
|
---|
| 697 | file->cf_User, line->cl_Shell);
|
---|
| 698 | } else if (line->cl_Pid == 0) {
|
---|
| 699 | line->cl_Pid = -1;
|
---|
| 700 | file->cf_Ready = 1;
|
---|
| 701 | ++nJobs;
|
---|
| 702 | }
|
---|
| 703 | }
|
---|
| 704 | }
|
---|
| 705 | }
|
---|
| 706 | }
|
---|
| 707 | }
|
---|
[1770] | 708 | return nJobs;
|
---|
[821] | 709 | }
|
---|
| 710 |
|
---|
| 711 | static void RunJobs(void)
|
---|
| 712 | {
|
---|
| 713 | CronFile *file;
|
---|
| 714 | CronLine *line;
|
---|
| 715 |
|
---|
| 716 | for (file = FileBase; file; file = file->cf_Next) {
|
---|
| 717 | if (file->cf_Ready) {
|
---|
| 718 | file->cf_Ready = 0;
|
---|
| 719 |
|
---|
| 720 | for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
---|
| 721 | if (line->cl_Pid < 0) {
|
---|
| 722 |
|
---|
| 723 | RunJob(file->cf_User, line);
|
---|
| 724 |
|
---|
| 725 | crondlog("\010USER %s pid %3d cmd %s\n",
|
---|
| 726 | file->cf_User, line->cl_Pid, line->cl_Shell);
|
---|
| 727 | if (line->cl_Pid < 0) {
|
---|
| 728 | file->cf_Ready = 1;
|
---|
| 729 | }
|
---|
| 730 | else if (line->cl_Pid > 0) {
|
---|
| 731 | file->cf_Running = 1;
|
---|
| 732 | }
|
---|
| 733 | }
|
---|
| 734 | }
|
---|
| 735 | }
|
---|
| 736 | }
|
---|
| 737 | }
|
---|
| 738 |
|
---|
| 739 | /*
|
---|
| 740 | * CheckJobs() - check for job completion
|
---|
| 741 | *
|
---|
| 742 | * Check for job completion, return number of jobs still running after
|
---|
| 743 | * all done.
|
---|
| 744 | */
|
---|
| 745 |
|
---|
| 746 | static int CheckJobs(void)
|
---|
| 747 | {
|
---|
| 748 | CronFile *file;
|
---|
| 749 | CronLine *line;
|
---|
| 750 | int nStillRunning = 0;
|
---|
| 751 |
|
---|
| 752 | for (file = FileBase; file; file = file->cf_Next) {
|
---|
| 753 | if (file->cf_Running) {
|
---|
| 754 | file->cf_Running = 0;
|
---|
| 755 |
|
---|
| 756 | for (line = file->cf_LineBase; line; line = line->cl_Next) {
|
---|
| 757 | if (line->cl_Pid > 0) {
|
---|
| 758 | int status;
|
---|
| 759 | int r = wait4(line->cl_Pid, &status, WNOHANG, NULL);
|
---|
| 760 |
|
---|
| 761 | if (r < 0 || r == line->cl_Pid) {
|
---|
| 762 | EndJob(file->cf_User, line);
|
---|
| 763 | if (line->cl_Pid) {
|
---|
| 764 | file->cf_Running = 1;
|
---|
| 765 | }
|
---|
| 766 | } else if (r == 0) {
|
---|
| 767 | file->cf_Running = 1;
|
---|
| 768 | }
|
---|
| 769 | }
|
---|
| 770 | }
|
---|
| 771 | }
|
---|
| 772 | nStillRunning += file->cf_Running;
|
---|
| 773 | }
|
---|
[1770] | 774 | return nStillRunning;
|
---|
[821] | 775 | }
|
---|
| 776 |
|
---|
| 777 |
|
---|
| 778 | #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
|
---|
| 779 | static void
|
---|
| 780 | ForkJob(const char *user, CronLine * line, int mailFd,
|
---|
| 781 | const char *prog, const char *cmd, const char *arg, const char *mailf)
|
---|
| 782 | {
|
---|
| 783 | /* Fork as the user in question and run program */
|
---|
| 784 | pid_t pid = fork();
|
---|
| 785 |
|
---|
| 786 | line->cl_Pid = pid;
|
---|
| 787 | if (pid == 0) {
|
---|
| 788 | /* CHILD */
|
---|
| 789 |
|
---|
| 790 | /* Change running state to the user in question */
|
---|
| 791 |
|
---|
| 792 | if (ChangeUser(user) < 0) {
|
---|
| 793 | exit(0);
|
---|
| 794 | }
|
---|
| 795 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 796 | if (DebugOpt) {
|
---|
| 797 | crondlog("\005Child Running %s\n", prog);
|
---|
| 798 | }
|
---|
| 799 | #endif
|
---|
| 800 |
|
---|
| 801 | if (mailFd >= 0) {
|
---|
| 802 | dup2(mailFd, mailf != NULL);
|
---|
| 803 | dup2((mailf ? mailFd : 1), 2);
|
---|
| 804 | close(mailFd);
|
---|
| 805 | }
|
---|
| 806 | execl(prog, prog, cmd, arg, NULL);
|
---|
[1770] | 807 | crondlog("\024cannot exec, user %s cmd %s %s %s\n", user, prog, cmd, arg);
|
---|
[821] | 808 | if (mailf) {
|
---|
| 809 | fdprintf(1, "Exec failed: %s -c %s\n", prog, arg);
|
---|
| 810 | }
|
---|
| 811 | exit(0);
|
---|
| 812 | } else if (pid < 0) {
|
---|
| 813 | /* FORK FAILED */
|
---|
[1770] | 814 | crondlog("\024cannot fork, user %s\n", user);
|
---|
[821] | 815 | line->cl_Pid = 0;
|
---|
| 816 | if (mailf) {
|
---|
| 817 | remove(mailf);
|
---|
| 818 | }
|
---|
| 819 | } else if (mailf) {
|
---|
| 820 | /* PARENT, FORK SUCCESS
|
---|
| 821 | * rename mail-file based on pid of process
|
---|
| 822 | */
|
---|
| 823 | char mailFile2[128];
|
---|
| 824 |
|
---|
| 825 | snprintf(mailFile2, sizeof(mailFile2), TMPDIR "/cron.%s.%d", user, pid);
|
---|
| 826 | rename(mailf, mailFile2);
|
---|
| 827 | }
|
---|
| 828 | /*
|
---|
| 829 | * Close the mail file descriptor.. we can't just leave it open in
|
---|
| 830 | * a structure, closing it later, because we might run out of descriptors
|
---|
| 831 | */
|
---|
| 832 |
|
---|
| 833 | if (mailFd >= 0) {
|
---|
| 834 | close(mailFd);
|
---|
| 835 | }
|
---|
| 836 | }
|
---|
| 837 |
|
---|
| 838 | static void RunJob(const char *user, CronLine * line)
|
---|
| 839 | {
|
---|
| 840 | char mailFile[128];
|
---|
| 841 | int mailFd;
|
---|
| 842 |
|
---|
| 843 | line->cl_Pid = 0;
|
---|
| 844 | line->cl_MailFlag = 0;
|
---|
| 845 |
|
---|
| 846 | /* open mail file - owner root so nobody can screw with it. */
|
---|
| 847 |
|
---|
| 848 | snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d", user, getpid());
|
---|
| 849 | mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
|
---|
| 850 |
|
---|
| 851 | if (mailFd >= 0) {
|
---|
| 852 | line->cl_MailFlag = 1;
|
---|
| 853 | fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", user,
|
---|
| 854 | line->cl_Shell);
|
---|
[1770] | 855 | line->cl_MailPos = lseek(mailFd, 0, SEEK_CUR);
|
---|
[821] | 856 | } else {
|
---|
[1770] | 857 | crondlog("\024cannot create mail file user %s file %s, output to /dev/null\n", user, mailFile);
|
---|
[821] | 858 | }
|
---|
| 859 |
|
---|
| 860 | ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
|
---|
| 861 | }
|
---|
| 862 |
|
---|
| 863 | /*
|
---|
| 864 | * EndJob - called when job terminates and when mail terminates
|
---|
| 865 | */
|
---|
| 866 |
|
---|
| 867 | static void EndJob(const char *user, CronLine * line)
|
---|
| 868 | {
|
---|
| 869 | int mailFd;
|
---|
| 870 | char mailFile[128];
|
---|
| 871 | struct stat sbuf;
|
---|
| 872 |
|
---|
| 873 | /* No job */
|
---|
| 874 |
|
---|
| 875 | if (line->cl_Pid <= 0) {
|
---|
| 876 | line->cl_Pid = 0;
|
---|
| 877 | return;
|
---|
| 878 | }
|
---|
| 879 |
|
---|
| 880 | /*
|
---|
| 881 | * End of job and no mail file
|
---|
| 882 | * End of sendmail job
|
---|
| 883 | */
|
---|
| 884 |
|
---|
| 885 | snprintf(mailFile, sizeof(mailFile), TMPDIR "/cron.%s.%d", user, line->cl_Pid);
|
---|
| 886 | line->cl_Pid = 0;
|
---|
| 887 |
|
---|
| 888 | if (line->cl_MailFlag != 1) {
|
---|
| 889 | return;
|
---|
| 890 | }
|
---|
| 891 | line->cl_MailFlag = 0;
|
---|
| 892 |
|
---|
| 893 | /*
|
---|
| 894 | * End of primary job - check for mail file. If size has increased and
|
---|
| 895 | * the file is still valid, we sendmail it.
|
---|
| 896 | */
|
---|
| 897 |
|
---|
| 898 | mailFd = open(mailFile, O_RDONLY);
|
---|
| 899 | remove(mailFile);
|
---|
| 900 | if (mailFd < 0) {
|
---|
| 901 | return;
|
---|
| 902 | }
|
---|
| 903 |
|
---|
[1770] | 904 | if (fstat(mailFd, &sbuf) < 0 || sbuf.st_uid != DaemonUid
|
---|
| 905 | || sbuf.st_nlink != 0 || sbuf.st_size == line->cl_MailPos
|
---|
| 906 | || !S_ISREG(sbuf.st_mode)
|
---|
| 907 | ) {
|
---|
[821] | 908 | close(mailFd);
|
---|
| 909 | return;
|
---|
| 910 | }
|
---|
| 911 | ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
|
---|
| 912 | }
|
---|
| 913 | #else
|
---|
| 914 | /* crond without sendmail */
|
---|
| 915 |
|
---|
| 916 | static void RunJob(const char *user, CronLine * line)
|
---|
| 917 | {
|
---|
| 918 | /* Fork as the user in question and run program */
|
---|
| 919 | pid_t pid = fork();
|
---|
| 920 |
|
---|
| 921 | if (pid == 0) {
|
---|
| 922 | /* CHILD */
|
---|
| 923 |
|
---|
| 924 | /* Change running state to the user in question */
|
---|
| 925 |
|
---|
| 926 | if (ChangeUser(user) < 0) {
|
---|
| 927 | exit(0);
|
---|
| 928 | }
|
---|
| 929 | #if ENABLE_DEBUG_CROND_OPTION
|
---|
| 930 | if (DebugOpt) {
|
---|
| 931 | crondlog("\005Child Running %s\n", DEFAULT_SHELL);
|
---|
| 932 | }
|
---|
| 933 | #endif
|
---|
| 934 |
|
---|
| 935 | execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_Shell, NULL);
|
---|
[1770] | 936 | crondlog("\024cannot exec, user %s cmd %s -c %s\n", user,
|
---|
[821] | 937 | DEFAULT_SHELL, line->cl_Shell);
|
---|
| 938 | exit(0);
|
---|
| 939 | } else if (pid < 0) {
|
---|
| 940 | /* FORK FAILED */
|
---|
[1770] | 941 | crondlog("\024cannot, user %s\n", user);
|
---|
[821] | 942 | pid = 0;
|
---|
| 943 | }
|
---|
| 944 | line->cl_Pid = pid;
|
---|
| 945 | }
|
---|
| 946 | #endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */
|
---|