* Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
* Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//usage:#define crontab_trivial_usage
+//usage: "[-c DIR] [-u USER] [-ler]|[FILE]"
+//usage:#define crontab_full_usage "\n\n"
+//usage: " -c Crontab directory"
+//usage: "\n -u User"
+//usage: "\n -l List crontab"
+//usage: "\n -e Edit crontab"
+//usage: "\n -r Delete crontab"
+//usage: "\n FILE Replace crontab by FILE ('-': stdin)"
+
#include "libbb.h"
#define CRONTABS CONFIG_FEATURE_CROND_DIR "/crontabs"
static void edit_file(const struct passwd *pas, const char *file)
{
const char *ptr;
- int pid = vfork();
+ pid_t pid;
- if (pid < 0) /* failure */
- bb_perror_msg_and_die("vfork");
+ pid = xvfork();
if (pid) { /* parent */
wait4pid(pid);
return;
/* CHILD - change user and run editor */
/* initgroups, setgid, setuid */
change_identity(pas);
- setup_environment(DEFAULT_SHELL,
+ setup_environment(pas->pw_shell,
SETUP_ENV_CHANGEENV | SETUP_ENV_TO_TMP,
pas);
ptr = getenv("VISUAL");
}
BB_EXECLP(ptr, ptr, file, NULL);
- bb_perror_msg_and_die("exec %s", ptr);
-}
-
-static int open_as_user(const struct passwd *pas, const char *file)
-{
- pid_t pid;
- char c;
-
- pid = vfork();
- if (pid < 0) /* ERROR */
- bb_perror_msg_and_die("vfork");
- if (pid) { /* PARENT */
- if (wait4pid(pid) == 0) {
- /* exitcode 0: child says it can read */
- return open(file, O_RDONLY);
- }
- return -1;
- }
-
- /* CHILD */
- /* initgroups, setgid, setuid */
- change_identity(pas);
- /* We just try to read one byte. If it works, file is readable
- * under this user. We signal that by exiting with 0. */
- _exit(safe_read(xopen(file, O_RDONLY), &c, 1) < 0);
+ bb_perror_msg_and_die("can't execute '%s'", ptr);
}
int crontab_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
if (!argv[0])
bb_show_usage();
if (NOT_LONE_DASH(argv[0])) {
- src_fd = open_as_user(pas, argv[0]);
- if (src_fd < 0)
- bb_error_msg_and_die("user %s cannot read %s",
- pas->pw_name, argv[0]);
+ src_fd = xopen_as_uid_gid(argv[0], O_RDONLY, pas->pw_uid, pas->pw_gid);
}
}
unlink(tmp_fname);
/*free(tmp_fname);*/
/*free(new_fname);*/
-
} /* switch */
/* Bump notification file. Handle window where crond picks file up