477 lines
9.1 KiB
C
477 lines
9.1 KiB
C
#ifndef lint
|
|
static char rcsid[] = "$Id: crontab.c,v 1.6 1993/12/07 10:27:05 mycroft Exp $";
|
|
#endif /* not lint */
|
|
|
|
#define MAIN_PROGRAM
|
|
|
|
|
|
#include "cron.h"
|
|
#include <pwd.h>
|
|
#include <errno.h>
|
|
#include <sys/file.h>
|
|
#if defined(BSD)
|
|
# include <sys/time.h>
|
|
#endif /*BSD*/
|
|
|
|
|
|
static int Pid;
|
|
static char User[MAX_UNAME], RealUser[MAX_UNAME];
|
|
static char Filename[MAX_FNAME];
|
|
static FILE *NewCrontab;
|
|
static int CheckErrorCount;
|
|
static enum {opt_unknown, opt_list, opt_delete, opt_edit, opt_replace}
|
|
Option;
|
|
|
|
extern char *getenv(), *strcpy();
|
|
extern int getuid();
|
|
extern struct passwd *getpwnam();
|
|
extern int getopt(), optind;
|
|
extern char *optarg;
|
|
extern void log_it(); /* misc.c */
|
|
|
|
#if DEBUGGING
|
|
static char *Options[] = {"???", "list", "delete", "edit", "replace"};
|
|
#endif
|
|
|
|
static void
|
|
usage()
|
|
{
|
|
fprintf(stderr, "usage: %s [-u user] ...\n", ProgramName);
|
|
fprintf(stderr, " ... -l (list user's crontab)\n");
|
|
fprintf(stderr, " ... -d (delete user's crontab)\n");
|
|
fprintf(stderr, " ... -e (edit user's crontab)\n");
|
|
fprintf(stderr, " ... -r file (replace user's crontab)\n");
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
static void parse_args(), list_cmd(), delete_cmd(), edit_cmd(), replace_cmd();
|
|
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
void set_cron_uid(), set_cron_cwd();
|
|
|
|
Pid = getpid();
|
|
ProgramName = argv[0];
|
|
#if defined(BSD)
|
|
setlinebuf(stderr);
|
|
#endif
|
|
parse_args(argc, argv); /* sets many globals, opens a file */
|
|
set_cron_uid();
|
|
set_cron_cwd();
|
|
if (!allowed(User)) {
|
|
fprintf(stderr,
|
|
"You (%s) are not allowed to use this program (%s)\n",
|
|
User, ProgramName);
|
|
fprintf(stderr, "See crontab(1) for more information\n");
|
|
log_it(RealUser, Pid, "AUTH", "crontab command not allowed");
|
|
exit(ERROR_EXIT);
|
|
}
|
|
switch (Option)
|
|
{
|
|
case opt_list: list_cmd();
|
|
break;
|
|
case opt_delete: delete_cmd();
|
|
break;
|
|
case opt_edit: edit_cmd();
|
|
break;
|
|
case opt_replace: replace_cmd();
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
parse_args(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
void usage();
|
|
|
|
struct passwd *pw;
|
|
int argch;
|
|
|
|
if (!(pw = getpwuid(getuid())))
|
|
{
|
|
fprintf(stderr, "%s: your UID isn't in the passwd file.\n",
|
|
ProgramName);
|
|
fprintf(stderr, "bailing out.\n");
|
|
exit(ERROR_EXIT);
|
|
}
|
|
strcpy(User, pw->pw_name);
|
|
strcpy(RealUser, User);
|
|
Filename[0] = '\0';
|
|
Option = opt_unknown;
|
|
while (EOF != (argch = getopt(argc, argv, "u:lder:x:")))
|
|
{
|
|
switch (argch)
|
|
{
|
|
case 'x':
|
|
if (!set_debug_flags(optarg))
|
|
usage();
|
|
break;
|
|
case 'u':
|
|
if (getuid() != ROOT_UID)
|
|
{
|
|
fprintf(stderr,
|
|
"must be privileged to use -u\n");
|
|
exit(ERROR_EXIT);
|
|
}
|
|
if ((struct passwd *)NULL == getpwnam(optarg))
|
|
{
|
|
fprintf(stderr, "%s: user `%s' unknown\n",
|
|
ProgramName, optarg);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
(void) strcpy(User, optarg);
|
|
break;
|
|
case 'l':
|
|
if (Option != opt_unknown)
|
|
usage();
|
|
Option = opt_list;
|
|
break;
|
|
case 'd':
|
|
if (Option != opt_unknown)
|
|
usage();
|
|
Option = opt_delete;
|
|
break;
|
|
case 'e':
|
|
if (Option != opt_unknown)
|
|
usage();
|
|
Option = opt_edit;
|
|
break;
|
|
case 'r':
|
|
if (Option != opt_unknown)
|
|
usage();
|
|
Option = opt_replace;
|
|
(void) strcpy(Filename, optarg);
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
|
|
endpwent();
|
|
|
|
if (Option == opt_unknown || argv[optind] != NULL)
|
|
usage();
|
|
|
|
if (Option == opt_replace) {
|
|
if (!Filename[0]) {
|
|
/* getopt(3) says this can't be true
|
|
* but I'm feeling extra paranoid today.
|
|
*/
|
|
fprintf(stderr, "filename must be given for -r\n");
|
|
usage();
|
|
}
|
|
/* we have to open the file here because we're going to
|
|
* chdir(2) into /var/cron before we get around to
|
|
* reading the file.
|
|
*/
|
|
if (!strcmp(Filename, "-")) {
|
|
NewCrontab = stdin;
|
|
} else {
|
|
if (!(NewCrontab = fopen(Filename, "r"))) {
|
|
perror(Filename);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
}
|
|
}
|
|
|
|
Debug(DMISC, ("user=%s, file=%s, option=%s\n",
|
|
User, Filename, Options[(int)Option]))
|
|
}
|
|
|
|
|
|
static void
|
|
list_cmd()
|
|
{
|
|
char n[MAX_FNAME];
|
|
FILE *f;
|
|
int ch;
|
|
|
|
log_it(RealUser, Pid, "LIST", User);
|
|
(void) sprintf(n, CRON_TAB(User));
|
|
if (!(f = fopen(n, "r")))
|
|
{
|
|
if (errno == ENOENT)
|
|
fprintf(stderr, "no crontab for %s\n", User);
|
|
else
|
|
perror(n);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
/* file is open. copy to stdout, close.
|
|
*/
|
|
Set_LineNum(1)
|
|
while (EOF != (ch = get_char(f)))
|
|
putchar(ch);
|
|
fclose(f);
|
|
}
|
|
|
|
static void poke_daemon();
|
|
|
|
static void
|
|
delete_cmd()
|
|
{
|
|
extern errno;
|
|
int unlink();
|
|
char n[MAX_FNAME];
|
|
|
|
log_it(RealUser, Pid, "DELETE", User);
|
|
(void) sprintf(n, CRON_TAB(User));
|
|
if (unlink(n))
|
|
{
|
|
if (errno == ENOENT)
|
|
fprintf(stderr, "no crontab for %s\n", User);
|
|
else
|
|
perror(n);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
poke_daemon();
|
|
}
|
|
|
|
|
|
static void
|
|
check_error(msg)
|
|
char *msg;
|
|
{
|
|
CheckErrorCount += 1;
|
|
fprintf(stderr, "\"%s\", line %d: %s\n", Filename, LineNumber, msg);
|
|
}
|
|
|
|
|
|
static void
|
|
edit_cmd()
|
|
{
|
|
char n[MAX_FNAME], tn[MAX_FNAME], *editor;
|
|
FILE *f, *tf;
|
|
int ch, t, pid;
|
|
struct stat before, after;
|
|
|
|
log_it(RealUser, Pid, "BEGIN EDIT", User);
|
|
(void) sprintf(n, CRON_TAB(User));
|
|
if (!(f = fopen(n, "r")))
|
|
{
|
|
if (errno == ENOENT)
|
|
fprintf(stderr, "no crontab for %s\n", User);
|
|
else
|
|
perror(n);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
(void) sprintf(tn, "/tmp/crontab.%d", getpid());
|
|
if (-1 == (t = open(tn, O_CREAT|O_RDWR, 0600))) {
|
|
perror(tn);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
if (fchown(t, getuid(), -1) < OK)
|
|
{
|
|
perror("chown");
|
|
goto fatal;
|
|
}
|
|
if (!(tf = fdopen(t, "r+"))) {
|
|
perror("fdopen");
|
|
goto fatal;
|
|
}
|
|
|
|
/* copy the crontab to the temp file. skip top two comments since we
|
|
* added them during the 'replace'.
|
|
*/
|
|
Set_LineNum(1)
|
|
t = 0;
|
|
while (EOF != (ch = get_char(f))) {
|
|
if (t < 2) {
|
|
t += (ch == '\n');
|
|
} else {
|
|
putc(ch, tf);
|
|
}
|
|
}
|
|
fflush(tf); rewind(tf);
|
|
fclose(f);
|
|
if (ferror(tf)) {
|
|
fprintf(stderr, "%s: error while writing new crontab to %s\n",
|
|
ProgramName, tn);
|
|
fclose(tf);
|
|
fatal:
|
|
unlink(tn);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
if ((!(editor = getenv("VISUAL")))
|
|
&& (!(editor = getenv("EDITOR")))
|
|
) {
|
|
editor = EDITOR;
|
|
}
|
|
|
|
(void) fstat(fileno(tf), &before);
|
|
fclose(tf);
|
|
|
|
pid = VFORK();
|
|
if (pid < 0) {
|
|
perror("fork");
|
|
goto fatal;
|
|
}
|
|
if (pid == 0) {
|
|
char *argv[3];
|
|
|
|
/* CHILD */
|
|
setuid(getuid()); /* give up euid which is root */
|
|
argv[0] = editor;
|
|
argv[1] = tn;
|
|
argv[2] = NULL;
|
|
fprintf(stderr, "[%s %s]\n", editor, tn);
|
|
execvp(editor, argv);
|
|
perror(editor);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
(void) wait((int *)0);
|
|
|
|
if (!(tf = fopen(tn, "r"))) {
|
|
perror(tn);
|
|
goto fatal;
|
|
}
|
|
(void) fstat(fileno(tf), &after);
|
|
if (after.st_mtime == before.st_mtime) {
|
|
fprintf(stderr, "[no changes were made to the crontab]\n");
|
|
fclose(tf);
|
|
} else {
|
|
fprintf(stderr, "[new crontab now being installed]\n");
|
|
NewCrontab = tf;
|
|
replace_cmd(); /* closes NewCrontab */
|
|
}
|
|
unlink(tn);
|
|
}
|
|
|
|
|
|
static void
|
|
replace_cmd()
|
|
{
|
|
entry *load_entry();
|
|
int load_env();
|
|
int unlink();
|
|
void free_entry();
|
|
void check_error();
|
|
void poke_daemon();
|
|
extern errno;
|
|
|
|
char n[MAX_FNAME], envstr[MAX_ENVSTR], tn[MAX_FNAME];
|
|
FILE *tmp;
|
|
int ch;
|
|
entry *e;
|
|
int status;
|
|
time_t now = time(NULL);
|
|
|
|
(void) sprintf(n, "tmp.%d", Pid);
|
|
(void) sprintf(tn, CRON_TAB(n));
|
|
if (!(tmp = fopen(tn, "w"))) {
|
|
perror(tn);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
/* write a signature at the top of the file. for brian.
|
|
*/
|
|
fprintf(tmp, "# (%s installed on %-24.24s)\n", Filename, ctime(&now));
|
|
fprintf(tmp, "# (Cron version -- %s)\n", rcsid);
|
|
|
|
/* copy the crontab to the tmp
|
|
*/
|
|
Set_LineNum(1)
|
|
while (EOF != (ch = get_char(NewCrontab)))
|
|
putc(ch, tmp);
|
|
fclose(NewCrontab);
|
|
fflush(tmp); rewind(tmp);
|
|
|
|
if (ferror(tmp)) {
|
|
fprintf(stderr, "%s: error while writing new crontab to %s\n",
|
|
ProgramName, tn);
|
|
fclose(tmp); unlink(tn);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
/* check the syntax of the file being installed.
|
|
*/
|
|
|
|
/* BUG: was reporting errors after the EOF if there were any errors
|
|
* in the file proper -- kludged it by stopping after first error.
|
|
* vix 31mar87
|
|
*/
|
|
CheckErrorCount = 0;
|
|
while (!CheckErrorCount && (status = load_env(envstr, tmp)) >= OK)
|
|
{
|
|
if (status == FALSE)
|
|
{
|
|
if (NULL != (e = load_entry(NewCrontab, check_error)))
|
|
free((char *) e);
|
|
}
|
|
}
|
|
|
|
if (CheckErrorCount != 0)
|
|
{
|
|
fprintf(stderr, "errors in crontab file, can't install.\n");
|
|
fclose(tmp); unlink(tn);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
if (fchown(fileno(tmp), ROOT_UID, -1) < OK)
|
|
{
|
|
perror("chown");
|
|
fclose(tmp); unlink(tn);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
if (fchmod(fileno(tmp), 0600) < OK)
|
|
{
|
|
perror("chown");
|
|
fclose(tmp); unlink(tn);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
if (fclose(tmp) == EOF) {
|
|
perror("fclose");
|
|
unlink(tn);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
|
|
(void) sprintf(n, CRON_TAB(User));
|
|
if (rename(tn, n))
|
|
{
|
|
fprintf(stderr, "%s: error renaming %s to %s\n",
|
|
ProgramName, tn, n);
|
|
perror("rename");
|
|
unlink(tn);
|
|
exit(ERROR_EXIT);
|
|
}
|
|
log_it(RealUser, Pid, "REPLACE", User);
|
|
|
|
poke_daemon();
|
|
}
|
|
|
|
|
|
static void
|
|
poke_daemon()
|
|
{
|
|
#if defined(BSD)
|
|
struct timeval tvs[2];
|
|
struct timezone tz;
|
|
|
|
(void) gettimeofday(&tvs[0], &tz);
|
|
tvs[1] = tvs[0];
|
|
if (utimes(SPOOL_DIR, tvs) < OK)
|
|
{
|
|
fprintf(stderr, "crontab: can't update mtime on spooldir\n");
|
|
perror(SPOOL_DIR);
|
|
return;
|
|
}
|
|
#endif /*BSD*/
|
|
#if defined(ATT)
|
|
if (utime(SPOOL_DIR, NULL) < OK)
|
|
{
|
|
fprintf(stderr, "crontab: can't update mtime on spooldir\n");
|
|
perror(SPOOL_DIR);
|
|
return;
|
|
}
|
|
#endif /*ATT*/
|
|
}
|