1 /* Copyright 1988,1990,1993,1994 by Paul Vixie
4 * Distribute freely, except: don't remove my name from the source or
5 * documentation (don't take credit for my work), mark your changes (don't
6 * get me blamed for your possible bugs), don't alter or remove this
7 * notice. May be sold if buildable source is provided to buyer. No
8 * warrantee of any kind, express or implied, is included with this
9 * software; use at your own risk, responsibility for damages (if any) to
10 * anyone resulting from the use of this software rests entirely with the
13 * Send bug reports, bug fixes, enhancements, requests, flames, etc., and
14 * I'll try to keep a version up to date. I can be reached as follows:
15 * Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul
18 #if !defined(lint) && !defined(LINT)
19 static const char rcsid[] =
23 /* vix 26jan87 [RCS has the log]
33 #define TMAX(a,b) ((a)>(b)?(a):(b))
36 static void process_crontab(char *, char *, char *,
38 cron_db *, cron_db *);
47 struct stat syscron_stat, st;
61 Debug(DLOAD, ("[%d] load_database()\n", getpid()))
63 /* before we start loading any data, do a stat on SPOOL_DIR
64 * so that if anything changes as of this moment (i.e., before we've
65 * cached any of the database), we'll see the changes next time.
67 if (stat(SPOOL_DIR, &statbuf) < OK) {
68 log_it("CRON", getpid(), "STAT FAILED", SPOOL_DIR);
69 (void) exit(ERROR_EXIT);
72 /* track system crontab file
74 if (stat(SYSCRONTAB, &syscron_stat) < OK)
75 syscron_stat.st_mtime = 0;
77 maxmtime = TMAX(statbuf.st_mtime, syscron_stat.st_mtime);
79 for (i = 0; i < nitems(syscrontabs); i++) {
80 if (stat(syscrontabs[i].name, &syscrontabs[i].st) != -1) {
81 maxmtime = TMAX(syscrontabs[i].st.st_mtime, maxmtime);
83 syscrontabs[i].st.st_mtime = 0;
87 /* if spooldir's mtime has not changed, we don't need to fiddle with
90 * Note that old_db->mtime is initialized to 0 in main(), and
91 * so is guaranteed to be different than the stat() mtime the first
92 * time this function is called.
94 if (old_db->mtime == maxmtime) {
95 Debug(DLOAD, ("[%d] spool dir mtime unch, no load needed.\n",
100 /* something's different. make a new database, moving unchanged
101 * elements from the old database, reloading elements that have
102 * actually changed. Whatever is left in the old database when
103 * we're done is chaff -- crontabs that disappeared.
105 new_db.mtime = maxmtime;
106 new_db.head = new_db.tail = NULL;
108 if (syscron_stat.st_mtime) {
109 process_crontab("root", SYS_NAME,
110 SYSCRONTAB, &syscron_stat,
114 for (i = 0; i < nitems(syscrontabs); i++) {
115 char tabname[MAXPATHLEN];
116 if (syscrontabs[i].st.st_mtime == 0)
118 if (!(dir = opendir(syscrontabs[i].name))) {
119 log_it("CRON", getpid(), "OPENDIR FAILED",
120 syscrontabs[i].name);
121 (void) exit(ERROR_EXIT);
124 while (NULL != (dp = readdir(dir))) {
125 if (dp->d_name[0] == '.')
127 if (fstatat(dirfd(dir), dp->d_name, &st, 0) == 0 &&
128 !S_ISREG(st.st_mode))
130 snprintf(tabname, sizeof(tabname), "%s/%s",
131 syscrontabs[i].name, dp->d_name);
132 process_crontab("root", SYS_NAME, tabname,
133 &syscrontabs[i].st, &new_db, old_db);
138 /* we used to keep this dir open all the time, for the sake of
139 * efficiency. however, we need to close it in every fork, and
140 * we fork a lot more often than the mtime of the dir changes.
142 if (!(dir = opendir(SPOOL_DIR))) {
143 log_it("CRON", getpid(), "OPENDIR FAILED", SPOOL_DIR);
144 (void) exit(ERROR_EXIT);
147 while (NULL != (dp = readdir(dir))) {
148 char fname[MAXNAMLEN+1],
149 tabname[MAXNAMLEN+1];
151 /* avoid file names beginning with ".". this is good
152 * because we would otherwise waste two guaranteed calls
153 * to getpwnam() for . and .., and also because user names
154 * starting with a period are just too nasty to consider.
156 if (dp->d_name[0] == '.')
159 (void) strncpy(fname, dp->d_name, sizeof(fname));
160 fname[sizeof(fname)-1] = '\0';
161 (void) snprintf(tabname, sizeof tabname, CRON_TAB(fname));
163 process_crontab(fname, fname, tabname,
164 &statbuf, &new_db, old_db);
168 /* if we don't do this, then when our children eventually call
169 * getpwnam() in do_command.c's child_process to verify MAILTO=,
170 * they will screw us up (and v-v).
174 /* whatever's left in the old database is now junk.
176 Debug(DLOAD, ("unlinking old database:\n"))
177 for (u = old_db->head; u != NULL; u = nu) {
178 Debug(DLOAD, ("\t%s\n", u->name))
180 unlink_user(old_db, u);
184 /* overwrite the database control block with the new one.
187 Debug(DLOAD, ("load_database is done\n"))
196 if (db->head == NULL)
214 u->prev->next = u->next;
219 u->next->prev = u->prev;
231 for (u = db->head; u != NULL; u = u->next)
232 if (!strcmp(u->name, name))
239 process_crontab(uname, fname, tabname, statbuf, new_db, old_db)
243 struct stat *statbuf;
247 struct passwd *pw = NULL;
248 int crontab_fd = OK - 1;
251 if (strcmp(fname, SYS_NAME) && !(pw = getpwnam(uname))) {
252 /* file doesn't have a user in passwd file.
254 log_it(fname, getpid(), "ORPHAN", "no passwd entry");
258 if ((crontab_fd = open(tabname, O_RDONLY, 0)) < OK) {
259 /* crontab not accessible?
261 log_it(fname, getpid(), "CAN'T OPEN", tabname);
265 if (fstat(crontab_fd, statbuf) < OK) {
266 log_it(fname, getpid(), "FSTAT FAILED", tabname);
270 Debug(DLOAD, ("\t%s:", fname))
271 u = find_user(old_db, fname);
273 /* if crontab has not changed since we last read it
274 * in, then we can just use our existing entry.
276 if (u->mtime == statbuf->st_mtime) {
277 Debug(DLOAD, (" [no change, using old data]"))
278 unlink_user(old_db, u);
279 link_user(new_db, u);
283 /* before we fall through to the code that will reload
284 * the user, let's deallocate and unlink the user in
285 * the old database. This is more a point of memory
286 * efficiency than anything else, since all leftover
287 * users will be deleted from the old database when
288 * we finish with the crontab...
290 Debug(DLOAD, (" [delete old data]"))
291 unlink_user(old_db, u);
293 log_it(fname, getpid(), "RELOAD", tabname);
295 u = load_user(crontab_fd, pw, fname);
297 u->mtime = statbuf->st_mtime;
298 link_user(new_db, u);
302 if (crontab_fd >= OK) {
303 Debug(DLOAD, (" [done]\n"))