Differential D40260 Diff 122386 usr.sbin/cron/cron/database.c

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usr.sbin/cron/cron/database.c

/* Copyright 1988,1990,1993,1994 by Paul Vixie		/* Copyright 1988,1990,1993,1994 by Paul Vixie
* All rights reserved		* All rights reserved
		*/

		/*
		* Copyright (c) 1997 by Internet Software Consortium
*		*
* Distribute freely, except: don't remove my name from the source or		* Permission to use, copy, modify, and distribute this software for any
* documentation (don't take credit for my work), mark your changes (don't		* purpose with or without fee is hereby granted, provided that the above
* get me blamed for your possible bugs), don't alter or remove this		* copyright notice and this permission notice appear in all copies.
* 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
* user.
*		*
* Send bug reports, bug fixes, enhancements, requests, flames, etc., and		* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* I'll try to keep a version up to date. I can be reached as follows:		* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* Paul Vixie <paul@vix.com> uunet!decwrl!vixie!paul		* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
		* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
		* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
		* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
		* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
		* SOFTWARE.
*/		*/

#if !defined(lint) && !defined(LINT)		#if !defined(lint) && !defined(LINT)
static const char rcsid[] =		static const char rcsid[] =
"$FreeBSD$";		"$Id: database.c,v 1.3 1998/08/14 00:32:38 vixie Exp $";
#endif		#endif

/* vix 26jan87 [RCS has the log]		/* vix 26jan87 [RCS has the log]
*/		*/


#include "cron.h"		#include "cron.h"
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/file.h>


#define TMAX(a,b) ((a)>(b)?(a):(b))		#define TMAX(a,b) ((a)>(b)?(a):(b))

		static void process_crontab(const char , const char ,
static void process_crontab(char , char , char *,		const char , struct stat ,
struct stat *,
cron_db , cron_db );		cron_db , cron_db );


void		void
load_database(cron_db *old_db)		load_database(cron_db *old_db)
{		{
DIR *dir;		struct stat statbuf, syscron_stat, st;
struct stat statbuf;
struct stat syscron_stat, st;
time_t maxmtime;
DIR_T *dp;
cron_db new_db;		cron_db new_db;
		DIR_T *dp;
		DIR *dir;
user u, nu;		user u, nu;
		time_t maxmtime;
struct {		struct {
const char *name;		const char *name;
struct stat st;		struct stat st;
} syscrontabs [] = {		} syscrontabs [] = {
{ SYSCRONTABS },		{ SYSCRONTABS },
{ LOCALSYSCRONTABS }		{ LOCALSYSCRONTABS }
};		};
int i, ret;		int i, ret;
▲ Show 20 Lines • Show All 92 Lines • ▼ Show 20 Lines	load_database(cron_db *old_db)
* we fork a lot more often than the mtime of the dir changes.		* we fork a lot more often than the mtime of the dir changes.
*/		*/
if (!(dir = opendir(SPOOL_DIR))) {		if (!(dir = opendir(SPOOL_DIR))) {
log_it("CRON", getpid(), "OPENDIR FAILED", SPOOL_DIR);		log_it("CRON", getpid(), "OPENDIR FAILED", SPOOL_DIR);
(void) exit(ERROR_EXIT);		(void) exit(ERROR_EXIT);
}		}

while (NULL != (dp = readdir(dir))) {		while (NULL != (dp = readdir(dir))) {
char fname[MAXNAMLEN+1],		char fname[MAXNAMLEN+1], tabname[MAXNAMLEN+1];
tabname[MAXNAMLEN+1];

/* avoid file names beginning with ".". this is good		/* avoid file names beginning with ".". this is good
* because we would otherwise waste two guaranteed calls		* because we would otherwise waste two guaranteed calls
* to getpwnam() for . and .., and also because user names		* to getpwnam() for . and .., and also because user names
* starting with a period are just too nasty to consider.		* starting with a period are just too nasty to consider.
*/		*/
if (dp->d_name[0] == '.')		if (dp->d_name[0] == '.')
continue;		continue;

(void) strncpy(fname, dp->d_name, sizeof(fname));		(void) strncpy(fname, dp->d_name, sizeof(fname));
fname[sizeof(fname)-1] = '\0';		fname[sizeof(fname)-1] = '\0';
(void) snprintf(tabname, sizeof tabname, CRON_TAB(fname));

		if (snprintf(tabname, sizeof tabname, CRON_TAB(fname))
		>= sizeof(tabname))
		continue; /* XXX log? */

process_crontab(fname, fname, tabname,		process_crontab(fname, fname, tabname,
&statbuf, &new_db, old_db);		&statbuf, &new_db, old_db);
}		}
closedir(dir);		closedir(dir);

/* if we don't do this, then when our children eventually call		/* if we don't do this, then when our children eventually call
* getpwnam() in do_command.c's child_process to verify MAILTO=,		* getpwnam() in do_command.c's child_process to verify MAILTO=,
* they will screw us up (and v-v).		* they will screw us up (and v-v).
Show All 11 Lines	load_database(cron_db *old_db)
}		}

/* overwrite the database control block with the new one.		/* overwrite the database control block with the new one.
*/		*/
*old_db = new_db;		*old_db = new_db;
Debug(DLOAD, ("load_database is done\n"))		Debug(DLOAD, ("load_database is done\n"))
}		}


void		void
link_user(cron_db db, user u)		link_user(cron_db db, user u)
{		{
if (db->head == NULL)		if (db->head == NULL)
db->head = u;		db->head = u;
if (db->tail)		if (db->tail)
db->tail->next = u;		db->tail->next = u;
u->prev = db->tail;		u->prev = db->tail;
u->next = NULL;		u->next = NULL;
db->tail = u;		db->tail = u;
}		}


void		void
unlink_user(cron_db db, user u)		unlink_user(cron_db db, user u)
{		{
if (u->prev == NULL)		if (u->prev == NULL)
db->head = u->next;		db->head = u->next;
else		else
u->prev->next = u->next;		u->prev->next = u->next;

if (u->next == NULL)		if (u->next == NULL)
db->tail = u->prev;		db->tail = u->prev;
else		else
u->next->prev = u->prev;		u->next->prev = u->prev;
}		}


user *		user *
find_user(cron_db db, char name)		find_user(cron_db db, const char name)
{		{
user *u;		user *u;

for (u = db->head; u != NULL; u = u->next)		for (u = db->head; u != NULL; u = u->next)
if (!strcmp(u->name, name))		if (strcmp(u->name, name) == 0)
break;		break;
return u;		return (u);
}		}


static void		static void
process_crontab(char uname, char fname, char tabname, struct stat statbuf,		process_crontab(const char uname, const char fname, const char *tabname,
cron_db new_db, cron_db old_db)		struct stat statbuf, cron_db new_db, cron_db *old_db)
{		{
struct passwd *pw = NULL;		struct passwd *pw = NULL;
int crontab_fd = OK - 1;		int crontab_fd = OK - 1;
user *u;		user *u;
entry *e;		entry *e;
time_t now;		time_t now;

if (strcmp(fname, SYS_NAME) && !(pw = getpwnam(uname))) {		if (strcmp(fname, SYS_NAME) != 0 && !(pw = getpwnam(uname))) {
/* file doesn't have a user in passwd file.		/* file doesn't have a user in passwd file.
*/		*/
log_it(fname, getpid(), "ORPHAN", "no passwd entry");		log_it(fname, getpid(), "ORPHAN", "no passwd entry");
goto next_crontab;		goto next_crontab;
}		}

if ((crontab_fd = open(tabname, O_RDONLY, 0)) < OK) {		if ((crontab_fd = open(tabname, O_RDONLY, 0)) < OK) {
/* crontab not accessible?		/* crontab not accessible?
▲ Show 20 Lines • Show All 48 Lines • ▼ Show 20 Lines	if (TargetTime != 0) {
for (e = u->crontab; e != NULL; e = e->next) {		for (e = u->crontab; e != NULL; e = e->next) {
if ((e->flags & INTERVAL) != 0)		if ((e->flags & INTERVAL) != 0)
e->lastexit = now;		e->lastexit = now;
}		}
}		}
link_user(new_db, u);		link_user(new_db, u);
}		}

next_crontab:		next_crontab:
if (crontab_fd >= OK) {		if (crontab_fd >= OK) {
Debug(DLOAD, (" [done]\n"))		Debug(DLOAD, (" [done]\n"))
close(crontab_fd);		close(crontab_fd);
}		}
}		}