#if !defined(lint) && !defined(LINT)
static char rcsid
[] = "$Header: database.c,v 2.1 90/07/18 00:23:51 vixie Exp $";
/* vix 26jan87 [RCS has the log]
/* Copyright 1988,1990 by Paul Vixie
* Distribute freely, except: don't remove my name from the source or
* documentation (don't take credit for my work), mark your changes (don't
* get me blamed for your possible bugs), don't alter or remove this
* notice. May be sold if buildable source is provided to buyer. No
* warrantee of any kind, express or implied, is included with this
* software; use at your own risk, responsibility for damages (if any) to
* anyone resulting from the use of this software rests entirely with the
* Send bug reports, bug fixes, enhancements, requests, flames, etc., and
* I'll try to keep a version up to date. I can be reached as follows:
* Paul Vixie, 329 Noe Street, San Francisco, CA, 94114, (415) 864-7013,
* paul@vixie.sf.ca.us || {hoptoad,pacbell,decwrl,crash}!vixie!paul
extern void perror(), exit();
extern void link_user(), unlink_user(), free_user();
extern user
*load_user(), *find_user();
Debug(DLOAD
, ("[%d] load_database()\n", getpid()))
/* before we start loading any data, do a stat on SPOOL_DIR
* so that if anything changes as of this moment (i.e., before we've
* cached any of the database), we'll see the changes next time.
if (stat(SPOOL_DIR
, &statbuf
) < OK
)
log_it("CROND", getpid(), "STAT FAILED", SPOOL_DIR
);
/* if spooldir's mtime has not changed, we don't need to fiddle with
* the database. Note that if /etc/passwd changes (like, someone's
* UID/GID/HOME/SHELL, we won't see it. Maybe we should
* keep an mtime for the passwd file? HINT
* Note that old_db->mtime is initialized to 0 in main(), and
* so is guaranteed to be different than the stat() mtime the first
* time this function is called.
if (old_db
->mtime
== statbuf
.st_mtime
)
Debug(DLOAD
, ("[%d] spool dir mtime unch, no load needed.\n",
/* make sure the dir is open. only happens the first time, since
* the DIR is static and we don't close it. Rewind the dir.
if (!(dir
= opendir(SPOOL_DIR
)))
log_it("CROND", getpid(), "OPENDIR FAILED", SPOOL_DIR
);
/* something's different. make a new database, moving unchanged
* elements from the old database, reloading elements that have
* actually changed. Whatever is left in the old database when
* we're done is chaff -- crontabs that disappeared.
new_db
.mtime
= statbuf
.st_mtime
;
new_db
.head
= new_db
.tail
= NULL
;
while (NULL
!= (dp
= readdir(dir
)))
extern struct passwd
*getpwnam();
(void) strncpy(fname
, dp
->d_name
, (int) dp
->d_namlen
);
fname
[dp
->d_namlen
] = '\0';
/* avoid file names beginning with ".". this is good
* because we would otherwise waste two guaranteed calls
* to getpwnam() for . and .., and also because user names
* starting with a period are just too nasty to consider.
if (NULL
== (pw
= getpwnam(fname
)))
/* file doesn't have a user in passwd file.
log_it(fname
, getpid(), "ORPHAN", "no passwd entry");
sprintf(tabname
, CRON_TAB(fname
));
if ((crontab_fd
= open(tabname
, O_RDONLY
, 0)) < OK
)
/* crontab not accessible?
log_it(fname
, getpid(), "CAN'T OPEN", tabname
);
if (fstat(crontab_fd
, &statbuf
) < OK
)
log_it(fname
, getpid(), "FSTAT FAILED", tabname
);
Debug(DLOAD
, ("\t%s:", fname
))
u
= find_user(old_db
, fname
);
/* if crontab has not changed since we last read it
* in, then we can just use our existing entry.
* note that we do not check for changes in the
* passwd entry (uid, home dir, etc). HINT
if (u
->mtime
== statbuf
.st_mtime
)
Debug(DLOAD
, (" [no change, using old data]"))
/* before we fall through to the code that will reload
* the user, let's deallocate and unlink the user in
* the old database. This is more a point of memory
* efficiency than anything else, since all leftover
* users will be deleted from the old database when
* we finish with the crontab...
Debug(DLOAD
, (" [delete old data]"))
u
->mtime
= statbuf
.st_mtime
;
Debug(DLOAD
, (" [done]\n"))
/* if we don't do this, then when our children eventually call
* getpwnam() in do_command.c's child_process to verify MAILTO=,
* they will screw us up (and v-v).
* (this was lots of fun to find...)
/* whatever's left in the old database is now junk.
Debug(DLOAD
, ("unlinking old database:\n"))
for (u
= old_db
->head
; u
!= NULL
; u
= u
->next
)
Debug(DLOAD
, ("\t%s\n", env_get(USERENV
, u
->envp
)))
/* overwrite the database control block with the new one.
Debug(DLOAD
, ("installing new database\n"))
/* BSD has structure assignments */
/* ATT, well, I don't know. Use memcpy(). */
memcpy(old_db
, &new_db
, sizeof(cron_db
));
Debug(DLOAD
, ("load_database is done\n"))
for (u
= db
->head
; u
!= NULL
; u
= u
->next
)
if (!strcmp(env_get(USERENV
, u
->envp
), name
))