blob: 27f24dd8570748dd7607dd9e2f03d2089d278715 [file] [log] [blame]
Bernhard Reutner-Fischer2c998512006-04-12 18:09:26 +00001/* vi: set sw=4 ts=4: */
Eric Andersenf6f7bfb2002-10-22 12:24:59 +00002/*
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)
Denis Vlasenkob9c02dd2007-08-18 15:48:00 +00008 * (version 2.3.2)
Mike Frysingerf284c762006-04-16 20:38:26 +00009 * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000010 *
Mike Frysingerf284c762006-04-16 20:38:26 +000011 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000012 */
13
Denis Vlasenkob9c02dd2007-08-18 15:48:00 +000014#include "libbb.h"
Bernhard Reutner-Fischerf4701962008-01-27 12:50:12 +000015#include <syslog.h>
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000016
Denis Vlasenko4e6c8122008-03-12 22:10:25 +000017/* glibc frees previous setenv'ed value when we do next setenv()
18 * of the same variable. uclibc does not do this! */
19#if (defined(__GLIBC__) && !defined(__UCLIBC__)) /* || OTHER_SAFE_LIBC... */
20#define SETENV_LEAKS 0
21#else
22#define SETENV_LEAKS 1
23#endif
24
25
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000026#ifndef CRONTABS
27#define CRONTABS "/var/spool/cron/crontabs"
28#endif
29#ifndef TMPDIR
30#define TMPDIR "/var/spool/cron"
31#endif
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000032#ifndef SENDMAIL
Denis Vlasenkob9c02dd2007-08-18 15:48:00 +000033#define SENDMAIL "sendmail"
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000034#endif
35#ifndef SENDMAIL_ARGS
Denis Vlasenko6ea75e22008-06-28 21:46:41 +000036#define SENDMAIL_ARGS "-ti", "oem"
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000037#endif
38#ifndef CRONUPDATE
39#define CRONUPDATE "cron.update"
40#endif
41#ifndef MAXLINES
Glenn L McGrath9079ad02004-02-22 04:44:21 +000042#define MAXLINES 256 /* max lines in non-root crontabs */
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000043#endif
44
Denis Vlasenko4e6c8122008-03-12 22:10:25 +000045
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000046typedef struct CronFile {
Glenn L McGrath9079ad02004-02-22 04:44:21 +000047 struct CronFile *cf_Next;
48 struct CronLine *cf_LineBase;
Denis Vlasenko4e6c8122008-03-12 22:10:25 +000049 char *cf_User; /* username */
50 smallint cf_Ready; /* bool: one or more jobs ready */
51 smallint cf_Running; /* bool: one or more jobs running */
52 smallint cf_Deleted; /* marked for deletion, ignore */
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000053} CronFile;
54
55typedef struct CronLine {
Glenn L McGrath9079ad02004-02-22 04:44:21 +000056 struct CronLine *cl_Next;
Denis Vlasenko4e6c8122008-03-12 22:10:25 +000057 char *cl_Shell; /* shell command */
58 pid_t cl_Pid; /* running pid, 0, or armed (-1) */
59#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
60 int cl_MailPos; /* 'empty file' size */
61 smallint cl_MailFlag; /* running pid is for mail */
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +000062 char *cl_MailTo; /* whom to mail results */
Denis Vlasenko4e6c8122008-03-12 22:10:25 +000063#endif
64 /* ordered by size, not in natural order. makes code smaller: */
65 char cl_Dow[7]; /* 0-6, beginning sunday */
66 char cl_Mons[12]; /* 0-11 */
67 char cl_Hrs[24]; /* 0-23 */
68 char cl_Days[32]; /* 1-31 */
69 char cl_Mins[60]; /* 0-59 */
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000070} CronLine;
71
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000072
73#define DaemonUid 0
74
Denis Vlasenko4e6c8122008-03-12 22:10:25 +000075
76enum {
77 OPT_l = (1 << 0),
78 OPT_L = (1 << 1),
79 OPT_f = (1 << 2),
80 OPT_b = (1 << 3),
81 OPT_S = (1 << 4),
82 OPT_c = (1 << 5),
83 OPT_d = (1 << 6) * ENABLE_DEBUG_CROND_OPTION,
84};
Bernhard Reutner-Fischeref216292006-05-20 14:14:05 +000085#if ENABLE_DEBUG_CROND_OPTION
Denis Vlasenko4e6c8122008-03-12 22:10:25 +000086#define DebugOpt (option_mask32 & OPT_d)
87#else
88#define DebugOpt 0
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000089#endif
90
Eric Andersenf6f7bfb2002-10-22 12:24:59 +000091
Denis Vlasenko4e6c8122008-03-12 22:10:25 +000092struct globals {
93 unsigned LogLevel; /* = 8; */
94 const char *LogFile;
95 const char *CDir; /* = CRONTABS; */
96 CronFile *FileBase;
97#if SETENV_LEAKS
98 char *env_var_user;
99 char *env_var_home;
100#endif
101};
102#define G (*(struct globals*)&bb_common_bufsiz1)
103#define LogLevel (G.LogLevel )
104#define LogFile (G.LogFile )
105#define CDir (G.CDir )
106#define FileBase (G.FileBase )
107#define env_var_user (G.env_var_user )
108#define env_var_home (G.env_var_home )
109#define INIT_G() do { \
110 LogLevel = 8; \
111 CDir = CRONTABS; \
112} while (0)
113
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000114
115static void CheckUpdates(void);
116static void SynchronizeDir(void);
117static int TestJobs(time_t t1, time_t t2);
118static void RunJobs(void);
119static int CheckJobs(void);
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000120static void RunJob(const char *user, CronLine *line);
Bernhard Reutner-Fischeref216292006-05-20 14:14:05 +0000121#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000122static void EndJob(const char *user, CronLine *line);
Eric Andersen35e643b2003-07-28 07:40:39 +0000123#else
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000124#define EndJob(user, line) ((line)->cl_Pid = 0)
Eric Andersen35e643b2003-07-28 07:40:39 +0000125#endif
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000126static void DeleteFile(const char *userName);
127
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000128
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000129#define LVL5 "\x05"
130#define LVL7 "\x07"
131#define LVL8 "\x08"
132#define LVL9 "\x09"
133#define WARN9 "\x49"
134#define DIE9 "\xc9"
135/* level >= 20 is "error" */
136#define ERR20 "\x14"
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000137
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000138static void crondlog(const char *ctl, ...)
Eric Andersen35e643b2003-07-28 07:40:39 +0000139{
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000140 va_list va;
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000141 int level = (ctl[0] & 0x1f);
Eric Andersen35e643b2003-07-28 07:40:39 +0000142
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000143 va_start(va, ctl);
Denis Vlasenko77ad97f2008-05-13 02:27:31 +0000144 if (level >= (int)LogLevel) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000145 /* Debug mode: all to (non-redirected) stderr, */
146 /* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
147 if (!DebugOpt && LogFile) {
148 /* Otherwise (log to file): we reopen log file at every write: */
Denis Vlasenko50f7f442007-04-11 23:20:53 +0000149 int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0600);
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000150 if (logfd >= 0)
151 xmove_fd(logfd, STDERR_FILENO);
Eric Andersen35e643b2003-07-28 07:40:39 +0000152 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000153// TODO: ERR -> error, WARN -> warning, LVL -> info
154 bb_verror_msg(ctl + 1, va, /* strerr: */ NULL);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000155 }
156 va_end(va);
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000157 if (ctl[0] & 0x80)
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000158 exit(20);
Eric Andersen35e643b2003-07-28 07:40:39 +0000159}
160
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +0000161int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkob44c7902008-03-17 09:29:43 +0000162int crond_main(int argc ATTRIBUTE_UNUSED, char **argv)
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000163{
Denis Vlasenko67b23e62006-10-03 21:00:06 +0000164 unsigned opt;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000165
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000166 INIT_G();
167
168 /* "-b after -f is ignored", and so on for every pair a-b */
169 opt_complementary = "f-b:b-f:S-L:L-S" USE_DEBUG_CROND_OPTION(":d-l")
170 ":l+:d+"; /* -l and -d have numeric param */
Denis Vlasenkob44c7902008-03-17 09:29:43 +0000171 opt = getopt32(argv, "l:L:fbSc:" USE_DEBUG_CROND_OPTION("d:"),
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000172 &LogLevel, &LogFile, &CDir
173 USE_DEBUG_CROND_OPTION(,&LogLevel));
174 /* both -d N and -l N set the same variable: LogLevel */
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000175
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000176 if (!(opt & OPT_f)) {
177 /* close stdin, stdout, stderr.
178 * close unused descriptors - don't need them. */
Denis Vlasenkoc52248e2008-03-20 14:04:30 +0000179 bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000180 }
181
182 if (!DebugOpt && LogFile == NULL) {
183 /* logging to syslog */
184 openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
185 logmode = LOGMODE_SYSLOG;
186 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000187
Denis Vlasenko5a142022007-03-26 13:20:54 +0000188 xchdir(CDir);
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000189 //signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
190 setenv("SHELL", DEFAULT_SHELL, 1); /* once, for all future children */
191 crondlog(LVL9 "crond (busybox "BB_VER") started, log level %d", LogLevel);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000192 SynchronizeDir();
193
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000194 /* main loop - synchronize to 1 second after the minute, minimum sleep
195 * of 1 second. */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000196 {
197 time_t t1 = time(NULL);
198 time_t t2;
199 long dt;
"Vladimir N. Oleynik"cd5c15d2006-01-30 13:36:03 +0000200 int rescan = 60;
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000201 int sleep_time = 60;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000202
Denis Vlasenko10457b92007-03-27 22:01:31 +0000203 write_pidfile("/var/run/crond.pid");
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000204 for (;;) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000205 sleep((sleep_time + 1) - (time(NULL) % sleep_time));
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000206
207 t2 = time(NULL);
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000208 dt = (long)t2 - (long)t1;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000209
210 /*
211 * The file 'cron.update' is checked to determine new cron
212 * jobs. The directory is rescanned once an hour to deal
213 * with any screwups.
214 *
215 * check for disparity. Disparities over an hour either way
216 * result in resynchronization. A reverse-indexed disparity
217 * less then an hour causes us to effectively sleep until we
218 * match the original time (i.e. no re-execution of jobs that
219 * have just been run). A forward-indexed disparity less then
220 * an hour causes intermediate jobs to be run, but only once
221 * in the worst case.
222 *
223 * when running jobs, the inequality used is greater but not
224 * equal to t1, and less then or equal to t2.
225 */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000226 if (--rescan == 0) {
227 rescan = 60;
228 SynchronizeDir();
229 }
230 CheckUpdates();
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000231 if (DebugOpt)
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000232 crondlog(LVL5 "wakeup dt=%ld", dt);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000233 if (dt < -60 * 60 || dt > 60 * 60) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000234 crondlog(WARN9 "time disparity of %d minutes detected", dt / 60);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000235 } else if (dt > 0) {
236 TestJobs(t1, t2);
237 RunJobs();
238 sleep(5);
239 if (CheckJobs() > 0) {
240 sleep_time = 10;
241 } else {
242 sleep_time = 60;
243 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000244 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000245 t1 = t2;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000246 }
247 }
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000248 return 0; /* not reached */
Glenn L McGrathb89fcd42003-12-23 07:21:33 +0000249}
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000250
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000251#if SETENV_LEAKS
252/* We set environment *before* vfork (because we want to use vfork),
253 * so we cannot use setenv() - repeated calls to setenv() may leak memory!
254 * Using putenv(), and freeing memory after unsetenv() won't leak */
255static void safe_setenv4(char **pvar_val, const char *var, const char *val /*, int len*/)
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000256{
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000257 const int len = 4; /* both var names are 4 char long */
258 char *var_val = *pvar_val;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000259
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000260 if (var_val) {
261 var_val[len] = '\0'; /* nuke '=' */
262 unsetenv(var_val);
263 free(var_val);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000264 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000265 *pvar_val = xasprintf("%s=%s", var, val);
266 putenv(*pvar_val);
267}
268#endif
269
270static void SetEnv(struct passwd *pas)
271{
272#if SETENV_LEAKS
273 safe_setenv4(&env_var_user, "USER", pas->pw_name);
274 safe_setenv4(&env_var_home, "HOME", pas->pw_dir);
275 /* if we want to set user's shell instead: */
276 /*safe_setenv(env_var_user, "SHELL", pas->pw_shell, 5);*/
277#else
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000278 setenv("USER", pas->pw_name, 1);
279 setenv("HOME", pas->pw_dir, 1);
Eric Andersen35e643b2003-07-28 07:40:39 +0000280#endif
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000281 /* currently, we use constant one: */
282 /*setenv("SHELL", DEFAULT_SHELL, 1); - done earlier */
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000283}
284
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000285static void ChangeUser(struct passwd *pas)
286{
287 /* careful: we're after vfork! */
288 change_identity(pas); /* - initgroups, setgid, setuid */
289 if (chdir(pas->pw_dir) < 0) {
290 crondlog(LVL9 "can't chdir(%s)", pas->pw_dir);
291 if (chdir(TMPDIR) < 0) {
292 crondlog(DIE9 "can't chdir(%s)", TMPDIR); /* exits */
293 }
294 }
295}
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000296
Denis Vlasenkof9000c52007-08-19 18:49:21 +0000297static const char DowAry[] ALIGN1 =
298 "sun""mon""tue""wed""thu""fri""sat"
299 /* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
300;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000301
Denis Vlasenkof9000c52007-08-19 18:49:21 +0000302static const char MonAry[] ALIGN1 =
303 "jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
304 /* "Jan""Feb""Mar""Apr""May""Jun""Jul""Aug""Sep""Oct""Nov""Dec" */
305;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000306
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000307static char *ParseField(char *user, char *ary, int modvalue, int off,
Denis Vlasenkof9000c52007-08-19 18:49:21 +0000308 const char *names, char *ptr)
309/* 'names' is a pointer to a set of 3-char abbreviations */
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000310{
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000311 char *base = ptr;
312 int n1 = -1;
313 int n2 = -1;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000314
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000315 if (base == NULL) {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000316 return NULL;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000317 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000318
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000319 while (!isspace(*ptr)) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000320 int skip = 0;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000321
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000322 /* Handle numeric digit or symbol or '*' */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000323 if (*ptr == '*') {
324 n1 = 0; /* everything will be filled */
325 n2 = modvalue - 1;
326 skip = 1;
327 ++ptr;
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000328 } else if (isdigit(*ptr)) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000329 if (n1 < 0) {
330 n1 = strtol(ptr, &ptr, 10) + off;
331 } else {
332 n2 = strtol(ptr, &ptr, 10) + off;
333 }
334 skip = 1;
335 } else if (names) {
336 int i;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000337
Denis Vlasenkof9000c52007-08-19 18:49:21 +0000338 for (i = 0; names[i]; i += 3) {
339 /* was using strncmp before... */
340 if (strncasecmp(ptr, &names[i], 3) == 0) {
341 ptr += 3;
342 if (n1 < 0) {
343 n1 = i / 3;
344 } else {
345 n2 = i / 3;
346 }
347 skip = 1;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000348 break;
349 }
350 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000351 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000352
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000353 /* handle optional range '-' */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000354 if (skip == 0) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000355 crondlog(WARN9 "user %s: parse error at %s", user, base);
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000356 return NULL;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000357 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000358 if (*ptr == '-' && n2 < 0) {
359 ++ptr;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000360 continue;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000361 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000362
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000363 /*
364 * collapse single-value ranges, handle skipmark, and fill
365 * in the character array appropriately.
366 */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000367 if (n2 < 0) {
368 n2 = n1;
369 }
370 if (*ptr == '/') {
371 skip = strtol(ptr + 1, &ptr, 10);
372 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000373
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000374 /*
375 * fill array, using a failsafe is the easiest way to prevent
376 * an endless loop
377 */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000378 {
379 int s0 = 1;
380 int failsafe = 1024;
381
382 --n1;
383 do {
384 n1 = (n1 + 1) % modvalue;
385
386 if (--s0 == 0) {
387 ary[n1 % modvalue] = 1;
388 s0 = skip;
389 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000390 if (--failsafe == 0) {
391 crondlog(WARN9 "user %s: parse error at %s", user, base);
392 return NULL;
393 }
394 } while (n1 != n2);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000395
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000396 }
397 if (*ptr != ',') {
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000398 break;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000399 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000400 ++ptr;
401 n1 = -1;
402 n2 = -1;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000403 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000404
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000405 if (!isspace(*ptr)) {
406 crondlog(WARN9 "user %s: parse error at %s", user, base);
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000407 return NULL;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000408 }
409
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000410 if (DebugOpt && (LogLevel <= 5)) { /* like LVL5 */
411 /* can't use crondlog, it inserts '\n' */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000412 int i;
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000413 for (i = 0; i < modvalue; ++i)
414 fprintf(stderr, "%d", (unsigned char)ary[i]);
415 fputc('\n', stderr);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000416 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000417 return skip_whitespace(ptr);
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000418}
419
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000420static void FixDayDow(CronLine *line)
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000421{
Denis Vlasenko6b06cb82008-05-15 21:30:45 +0000422 unsigned i;
"Vladimir N. Oleynik"cd5c15d2006-01-30 13:36:03 +0000423 int weekUsed = 0;
424 int daysUsed = 0;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000425
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000426 for (i = 0; i < ARRAY_SIZE(line->cl_Dow); ++i) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000427 if (line->cl_Dow[i] == 0) {
428 weekUsed = 1;
429 break;
430 }
431 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000432 for (i = 0; i < ARRAY_SIZE(line->cl_Days); ++i) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000433 if (line->cl_Days[i] == 0) {
434 daysUsed = 1;
435 break;
436 }
437 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000438 if (weekUsed != daysUsed) {
439 if (weekUsed)
440 memset(line->cl_Days, 0, sizeof(line->cl_Days));
441 else /* daysUsed */
442 memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000443 }
444}
445
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000446static void SynchronizeFile(const char *fileName)
447{
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000448 FILE *fi;
449 struct stat sbuf;
450 int maxEntries;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000451 int maxLines;
452 char buf[1024];
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000453#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
454 char *mailTo = NULL;
455#endif
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000456
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000457 if (!fileName)
458 return;
459
460 DeleteFile(fileName);
461 fi = fopen(fileName, "r");
462 if (!fi)
463 return;
464
465 maxEntries = MAXLINES;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000466 if (strcmp(fileName, "root") == 0) {
467 maxEntries = 65535;
468 }
469 maxLines = maxEntries * 10;
470
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000471 if (fstat(fileno(fi), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
472 CronFile *file = xzalloc(sizeof(CronFile));
473 CronLine **pline;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000474
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000475 file->cf_User = xstrdup(fileName);
476 pline = &file->cf_LineBase;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000477
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000478 while (fgets(buf, sizeof(buf), fi) != NULL && --maxLines) {
479 CronLine *line;
480 char *ptr;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000481
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000482 trim(buf);
483 if (buf[0] == '\0' || buf[0] == '#') {
484 continue;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000485 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000486 if (--maxEntries == 0) {
487 break;
488 }
489 if (DebugOpt) {
490 crondlog(LVL5 "user:%s entry:%s", fileName, buf);
491 }
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000492 /* check if line is setting MAILTO= */
493 if (0 == strncmp("MAILTO=", buf, 7)) {
494#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
495 free(mailTo);
496 mailTo = (buf[7]) ? xstrdup(buf+7) : NULL;
497#endif /* otherwise just ignore such lines */
498 continue;
499 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000500 *pline = line = xzalloc(sizeof(CronLine));
501 /* parse date ranges */
502 ptr = ParseField(file->cf_User, line->cl_Mins, 60, 0, NULL, buf);
503 ptr = ParseField(file->cf_User, line->cl_Hrs, 24, 0, NULL, ptr);
504 ptr = ParseField(file->cf_User, line->cl_Days, 32, 0, NULL, ptr);
505 ptr = ParseField(file->cf_User, line->cl_Mons, 12, -1, MonAry, ptr);
506 ptr = ParseField(file->cf_User, line->cl_Dow, 7, 0, DowAry, ptr);
507 /* check failure */
508 if (ptr == NULL) {
509 free(line);
510 continue;
511 }
512 /*
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000513 * fix days and dow - if one is not "*" and the other
514 * is "*", the other is set to 0, and vise-versa
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000515 */
516 FixDayDow(line);
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000517#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
518 /* copy mailto (can be NULL) */
519 line->cl_MailTo = xstrdup(mailTo);
520#endif
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000521 /* copy command */
522 line->cl_Shell = xstrdup(ptr);
523 if (DebugOpt) {
524 crondlog(LVL5 " command:%s", ptr);
525 }
526 pline = &line->cl_Next;
527 }
528 *pline = NULL;
529
530 file->cf_Next = FileBase;
531 FileBase = file;
532
533 if (maxLines == 0 || maxEntries == 0) {
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000534 crondlog(WARN9 "user %s: too many lines", fileName);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000535 }
536 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000537 fclose(fi);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000538}
539
540static void CheckUpdates(void)
541{
542 FILE *fi;
543 char buf[256];
544
545 fi = fopen(CRONUPDATE, "r");
546 if (fi != NULL) {
Denis Vlasenkocb448fe2008-02-17 14:28:53 +0000547 unlink(CRONUPDATE);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000548 while (fgets(buf, sizeof(buf), fi) != NULL) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000549 /* use first word only */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000550 SynchronizeFile(strtok(buf, " \t\r\n"));
551 }
552 fclose(fi);
553 }
554}
555
556static void SynchronizeDir(void)
557{
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000558 CronFile *file;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000559 /* Attempt to delete the database. */
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000560 again:
561 for (file = FileBase; file; file = file->cf_Next) {
562 if (!file->cf_Deleted) {
563 DeleteFile(file->cf_User);
564 goto again;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000565 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000566 }
567
568 /*
569 * Remove cron update file
570 *
571 * Re-chdir, in case directory was renamed & deleted, or otherwise
572 * screwed up.
573 *
574 * scan directory and add associated users
575 */
Denis Vlasenkocb448fe2008-02-17 14:28:53 +0000576 unlink(CRONUPDATE);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000577 if (chdir(CDir) < 0) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000578 crondlog(DIE9 "can't chdir(%s)", CDir);
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000579 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000580 {
581 DIR *dir = opendir(".");
582 struct dirent *den;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000583
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000584 if (!dir)
585 crondlog(DIE9 "can't chdir(%s)", "."); /* exits */
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000586 while ((den = readdir(dir)) != NULL) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000587 if (strchr(den->d_name, '.') != NULL) {
588 continue;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000589 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000590 if (getpwnam(den->d_name)) {
591 SynchronizeFile(den->d_name);
592 } else {
593 crondlog(LVL7 "ignoring %s", den->d_name);
594 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000595 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000596 closedir(dir);
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000597 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000598}
599
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000600/*
601 * DeleteFile() - delete user database
602 *
603 * Note: multiple entries for same user may exist if we were unable to
604 * completely delete a database due to running processes.
605 */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000606static void DeleteFile(const char *userName)
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000607{
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000608 CronFile **pfile = &FileBase;
609 CronFile *file;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000610
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000611 while ((file = *pfile) != NULL) {
612 if (strcmp(userName, file->cf_User) == 0) {
613 CronLine **pline = &file->cf_LineBase;
614 CronLine *line;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000615
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000616 file->cf_Running = 0;
617 file->cf_Deleted = 1;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000618
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000619 while ((line = *pline) != NULL) {
620 if (line->cl_Pid > 0) {
621 file->cf_Running = 1;
622 pline = &line->cl_Next;
623 } else {
624 *pline = line->cl_Next;
625 free(line->cl_Shell);
626 free(line);
627 }
628 }
629 if (file->cf_Running == 0) {
630 *pfile = file->cf_Next;
631 free(file->cf_User);
632 free(file);
633 } else {
634 pfile = &file->cf_Next;
635 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000636 } else {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000637 pfile = &file->cf_Next;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000638 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000639 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000640}
641
642/*
643 * TestJobs()
644 *
645 * determine which jobs need to be run. Under normal conditions, the
646 * period is about a minute (one scan). Worst case it will be one
647 * hour (60 scans).
648 */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000649static int TestJobs(time_t t1, time_t t2)
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000650{
"Vladimir N. Oleynik"cd5c15d2006-01-30 13:36:03 +0000651 int nJobs = 0;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000652 time_t t;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000653
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000654 /* Find jobs > t1 and <= t2 */
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000655
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000656 for (t = t1 - t1 % 60; t <= t2; t += 60) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000657 struct tm *tp;
658 CronFile *file;
659 CronLine *line;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000660
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000661 if (t <= t1)
662 continue;
663
664 tp = localtime(&t);
665 for (file = FileBase; file; file = file->cf_Next) {
666 if (DebugOpt)
667 crondlog(LVL5 "file %s:", file->cf_User);
668 if (file->cf_Deleted)
669 continue;
670 for (line = file->cf_LineBase; line; line = line->cl_Next) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000671 if (DebugOpt)
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000672 crondlog(LVL5 " line %s", line->cl_Shell);
673 if (line->cl_Mins[tp->tm_min] && line->cl_Hrs[tp->tm_hour]
674 && (line->cl_Days[tp->tm_mday] || line->cl_Dow[tp->tm_wday])
675 && line->cl_Mons[tp->tm_mon]
676 ) {
677 if (DebugOpt) {
678 crondlog(LVL5 " job: %d %s",
679 (int)line->cl_Pid, line->cl_Shell);
680 }
681 if (line->cl_Pid > 0) {
682 crondlog(LVL8 "user %s: process already running: %s",
683 file->cf_User, line->cl_Shell);
684 } else if (line->cl_Pid == 0) {
685 line->cl_Pid = -1;
686 file->cf_Ready = 1;
687 ++nJobs;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000688 }
689 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000690 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000691 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000692 }
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000693 return nJobs;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000694}
695
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000696static void RunJobs(void)
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000697{
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000698 CronFile *file;
699 CronLine *line;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000700
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000701 for (file = FileBase; file; file = file->cf_Next) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000702 if (!file->cf_Ready)
703 continue;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000704
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000705 file->cf_Ready = 0;
706 for (line = file->cf_LineBase; line; line = line->cl_Next) {
707 if (line->cl_Pid >= 0)
708 continue;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000709
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000710 RunJob(file->cf_User, line);
711 crondlog(LVL8 "USER %s pid %3d cmd %s",
712 file->cf_User, (int)line->cl_Pid, line->cl_Shell);
713 if (line->cl_Pid < 0) {
714 file->cf_Ready = 1;
715 } else if (line->cl_Pid > 0) {
716 file->cf_Running = 1;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000717 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000718 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000719 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000720}
721
722/*
723 * CheckJobs() - check for job completion
724 *
725 * Check for job completion, return number of jobs still running after
726 * all done.
727 */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000728static int CheckJobs(void)
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000729{
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000730 CronFile *file;
731 CronLine *line;
732 int nStillRunning = 0;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000733
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000734 for (file = FileBase; file; file = file->cf_Next) {
735 if (file->cf_Running) {
736 file->cf_Running = 0;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000737
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000738 for (line = file->cf_LineBase; line; line = line->cl_Next) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000739 int status, r;
740 if (line->cl_Pid <= 0)
741 continue;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000742
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000743 r = waitpid(line->cl_Pid, &status, WNOHANG);
744 if (r < 0 || r == line->cl_Pid) {
745 EndJob(file->cf_User, line);
746 if (line->cl_Pid) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000747 file->cf_Running = 1;
748 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000749 } else if (r == 0) {
750 file->cf_Running = 1;
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000751 }
752 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000753 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000754 nStillRunning += file->cf_Running;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000755 }
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000756 return nStillRunning;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000757}
758
Bernhard Reutner-Fischeref216292006-05-20 14:14:05 +0000759#if ENABLE_FEATURE_CROND_CALL_SENDMAIL
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000760
761// TODO: sendmail should be _run-time_ option, not compile-time!
762
Eric Andersen35e643b2003-07-28 07:40:39 +0000763static void
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000764ForkJob(const char *user, CronLine *line, int mailFd,
Denis Vlasenko314820e2008-01-24 01:33:12 +0000765 const char *prog, const char *cmd, const char *arg,
766 const char *mail_filename)
Eric Andersen35e643b2003-07-28 07:40:39 +0000767{
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000768 struct passwd *pas;
769 pid_t pid;
Eric Andersen35e643b2003-07-28 07:40:39 +0000770
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000771 /* prepare things before vfork */
772 pas = getpwnam(user);
773 if (!pas) {
774 crondlog(LVL9 "can't get uid for %s", user);
775 goto err;
776 }
777 SetEnv(pas);
778
779 pid = vfork();
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000780 if (pid == 0) {
781 /* CHILD */
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000782 /* change running state to the user in question */
783 ChangeUser(pas);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000784 if (DebugOpt) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000785 crondlog(LVL5 "child running %s", prog);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000786 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000787 if (mailFd >= 0) {
Denis Vlasenko314820e2008-01-24 01:33:12 +0000788 xmove_fd(mailFd, mail_filename ? 1 : 0);
789 dup2(1, 2);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000790 }
791 execl(prog, prog, cmd, arg, NULL);
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000792 crondlog(ERR20 "can't exec, user %s cmd %s %s %s", user, prog, cmd, arg);
Denis Vlasenko314820e2008-01-24 01:33:12 +0000793 if (mail_filename) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000794 fdprintf(1, "Exec failed: %s -c %s\n", prog, arg);
795 }
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +0000796 _exit(EXIT_SUCCESS);
Denis Vlasenko314820e2008-01-24 01:33:12 +0000797 }
798
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000799 line->cl_Pid = pid;
Denis Vlasenko314820e2008-01-24 01:33:12 +0000800 if (pid < 0) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000801 /* FORK FAILED */
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000802 crondlog(ERR20 "can't vfork");
803 err:
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000804 line->cl_Pid = 0;
Denis Vlasenko314820e2008-01-24 01:33:12 +0000805 if (mail_filename) {
Denis Vlasenkocb448fe2008-02-17 14:28:53 +0000806 unlink(mail_filename);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000807 }
Denis Vlasenko314820e2008-01-24 01:33:12 +0000808 } else if (mail_filename) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000809 /* PARENT, FORK SUCCESS
810 * rename mail-file based on pid of process
811 */
812 char mailFile2[128];
813
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000814 snprintf(mailFile2, sizeof(mailFile2), "%s/cron.%s.%d", TMPDIR, user, pid);
Denis Vlasenkocb448fe2008-02-17 14:28:53 +0000815 rename(mail_filename, mailFile2); // TODO: xrename?
Eric Andersen35e643b2003-07-28 07:40:39 +0000816 }
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000817
Eric Andersen35e643b2003-07-28 07:40:39 +0000818 /*
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000819 * Close the mail file descriptor.. we can't just leave it open in
820 * a structure, closing it later, because we might run out of descriptors
Eric Andersen35e643b2003-07-28 07:40:39 +0000821 */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000822 if (mailFd >= 0) {
823 close(mailFd);
824 }
Eric Andersen35e643b2003-07-28 07:40:39 +0000825}
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000826
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000827static void RunJob(const char *user, CronLine *line)
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000828{
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000829 char mailFile[128];
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000830 int mailFd = -1;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000831
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000832 line->cl_Pid = 0;
833 line->cl_MailFlag = 0;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000834
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000835 if (line->cl_MailTo) {
836 /* open mail file - owner root so nobody can screw with it. */
837 snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, getpid());
838 mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000839
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000840 if (mailFd >= 0) {
841 line->cl_MailFlag = 1;
842 fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", user,
843 line->cl_Shell);
844 line->cl_MailPos = lseek(mailFd, 0, SEEK_CUR);
845 } else {
846 crondlog(ERR20 "cannot create mail file %s for user %s, "
847 "discarding output", mailFile, user);
848 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000849 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000850
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000851 ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000852}
853
854/*
855 * EndJob - called when job terminates and when mail terminates
856 */
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000857static void EndJob(const char *user, CronLine *line)
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000858{
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000859 int mailFd;
860 char mailFile[128];
861 struct stat sbuf;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000862
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000863 /* No job */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000864 if (line->cl_Pid <= 0) {
865 line->cl_Pid = 0;
866 return;
867 }
868
869 /*
870 * End of job and no mail file
871 * End of sendmail job
872 */
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000873 snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, line->cl_Pid);
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000874 line->cl_Pid = 0;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000875
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000876 if (line->cl_MailFlag == 0) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000877 return;
878 }
879 line->cl_MailFlag = 0;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000880
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000881 /*
882 * End of primary job - check for mail file. If size has increased and
883 * the file is still valid, we sendmail it.
884 */
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000885 mailFd = open(mailFile, O_RDONLY);
Denis Vlasenkocb448fe2008-02-17 14:28:53 +0000886 unlink(mailFile);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000887 if (mailFd < 0) {
888 return;
889 }
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000890
Denis Vlasenkob9c02dd2007-08-18 15:48:00 +0000891 if (fstat(mailFd, &sbuf) < 0 || sbuf.st_uid != DaemonUid
892 || sbuf.st_nlink != 0 || sbuf.st_size == line->cl_MailPos
893 || !S_ISREG(sbuf.st_mode)
894 ) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000895 close(mailFd);
896 return;
897 }
Denis Vlasenko6fa1ba32008-04-07 21:02:35 +0000898 if (line->cl_MailTo)
899 ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
Eric Andersen35e643b2003-07-28 07:40:39 +0000900}
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000901
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000902#else /* crond without sendmail */
903
904static void RunJob(const char *user, CronLine *line)
Eric Andersen35e643b2003-07-28 07:40:39 +0000905{
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000906 struct passwd *pas;
907 pid_t pid;
Eric Andersen35e643b2003-07-28 07:40:39 +0000908
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000909 /* prepare things before vfork */
910 pas = getpwnam(user);
911 if (!pas) {
912 crondlog(LVL9 "can't get uid for %s", user);
913 goto err;
914 }
915 SetEnv(pas);
916
917 /* fork as the user in question and run program */
918 pid = vfork();
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000919 if (pid == 0) {
920 /* CHILD */
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000921 /* change running state to the user in question */
922 ChangeUser(pas);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000923 if (DebugOpt) {
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000924 crondlog(LVL5 "child running %s", DEFAULT_SHELL);
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000925 }
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000926 execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_Shell, NULL);
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000927 crondlog(ERR20 "can't exec, user %s cmd %s %s %s", user,
928 DEFAULT_SHELL, "-c", line->cl_Shell);
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +0000929 _exit(EXIT_SUCCESS);
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000930 }
931 if (pid < 0) {
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000932 /* FORK FAILED */
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000933 crondlog(ERR20 "can't vfork");
934 err:
Glenn L McGrath9079ad02004-02-22 04:44:21 +0000935 pid = 0;
936 }
937 line->cl_Pid = pid;
Eric Andersenf6f7bfb2002-10-22 12:24:59 +0000938}
Denis Vlasenko4e6c8122008-03-12 22:10:25 +0000939
Bernhard Reutner-Fischeref216292006-05-20 14:14:05 +0000940#endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */