[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/miscutils/crontab.c b/ap/app/busybox/src/miscutils/crontab.c
new file mode 100644
index 0000000..4731d8d
--- /dev/null
+++ b/ap/app/busybox/src/miscutils/crontab.c
@@ -0,0 +1,222 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * CRONTAB
+ *
+ * usually setuid root, -c option only works if getuid() == geteuid()
+ *
+ * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
+ * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
+ *
+ * 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"
+#ifndef CRONUPDATE
+#define CRONUPDATE "cron.update"
+#endif
+
+static void edit_file(const struct passwd *pas, const char *file)
+{
+ const char *ptr;
+ pid_t pid;
+
+ pid = xvfork();
+ if (pid) { /* parent */
+ wait4pid(pid);
+ return;
+ }
+
+ /* CHILD - change user and run editor */
+ /* initgroups, setgid, setuid */
+ change_identity(pas);
+ setup_environment(pas->pw_shell,
+ SETUP_ENV_CHANGEENV | SETUP_ENV_TO_TMP,
+ pas);
+ ptr = getenv("VISUAL");
+ if (!ptr) {
+ ptr = getenv("EDITOR");
+ if (!ptr)
+ ptr = "vi";
+ }
+
+ BB_EXECLP(ptr, ptr, file, NULL);
+ bb_perror_msg_and_die("can't execute '%s'", ptr);
+}
+
+static int open_as_user(const struct passwd *pas, const char *file)
+{
+ pid_t pid;
+ char c;
+
+ pid = xvfork();
+ 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);
+}
+
+int crontab_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int crontab_main(int argc UNUSED_PARAM, char **argv)
+{
+ const struct passwd *pas;
+ const char *crontab_dir = CRONTABS;
+ char *tmp_fname;
+ char *new_fname;
+ char *user_name; /* -u USER */
+ int fd;
+ int src_fd;
+ int opt_ler;
+
+ /* file [opts] Replace crontab from file
+ * - [opts] Replace crontab from stdin
+ * -u user User
+ * -c dir Crontab directory
+ * -l List crontab for user
+ * -e Edit crontab for user
+ * -r Delete crontab for user
+ * bbox also supports -d == -r, but most other crontab
+ * implementations do not. Deprecated.
+ */
+ enum {
+ OPT_u = (1 << 0),
+ OPT_c = (1 << 1),
+ OPT_l = (1 << 2),
+ OPT_e = (1 << 3),
+ OPT_r = (1 << 4),
+ OPT_ler = OPT_l + OPT_e + OPT_r,
+ };
+
+ opt_complementary = "?1:dr"; /* max one argument; -d implies -r */
+ opt_ler = getopt32(argv, "u:c:lerd", &user_name, &crontab_dir);
+ argv += optind;
+
+ if (sanitize_env_if_suid()) { /* Clears dangerous stuff, sets PATH */
+ /* Run by non-root */
+ if (opt_ler & (OPT_u|OPT_c))
+ bb_error_msg_and_die(bb_msg_you_must_be_root);
+ }
+
+ if (opt_ler & OPT_u) {
+ pas = xgetpwnam(user_name);
+ } else {
+ pas = xgetpwuid(getuid());
+ }
+
+#define user_name DONT_USE_ME_BEYOND_THIS_POINT
+
+ /* From now on, keep only -l, -e, -r bits */
+ opt_ler &= OPT_ler;
+ if ((opt_ler - 1) & opt_ler) /* more than one bit set? */
+ bb_show_usage();
+
+ /* Read replacement file under user's UID/GID/group vector */
+ src_fd = STDIN_FILENO;
+ if (!opt_ler) { /* Replace? */
+ 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]);
+ }
+ }
+
+ /* cd to our crontab directory */
+ xchdir(crontab_dir);
+
+ tmp_fname = NULL;
+
+ /* Handle requested operation */
+ switch (opt_ler) {
+
+ default: /* case OPT_r: Delete */
+ unlink(pas->pw_name);
+ break;
+
+ case OPT_l: /* List */
+ {
+ char *args[2] = { pas->pw_name, NULL };
+ return bb_cat(args);
+ /* list exits,
+ * the rest go play with cron update file */
+ }
+
+ case OPT_e: /* Edit */
+ tmp_fname = xasprintf("%s.%u", crontab_dir, (unsigned)getpid());
+ /* No O_EXCL: we don't want to be stuck if earlier crontabs
+ * were killed, leaving stale temp file behind */
+ src_fd = xopen3(tmp_fname, O_RDWR|O_CREAT|O_TRUNC, 0600);
+ fchown(src_fd, pas->pw_uid, pas->pw_gid);
+ fd = open(pas->pw_name, O_RDONLY);
+ if (fd >= 0) {
+ bb_copyfd_eof(fd, src_fd);
+ close(fd);
+ xlseek(src_fd, 0, SEEK_SET);
+ }
+ close_on_exec_on(src_fd); /* don't want editor to see this fd */
+ edit_file(pas, tmp_fname);
+ /* fall through */
+
+ case 0: /* Replace (no -l, -e, or -r were given) */
+ new_fname = xasprintf("%s.new", pas->pw_name);
+ fd = open(new_fname, O_WRONLY|O_CREAT|O_TRUNC|O_APPEND, 0600);
+ if (fd >= 0) {
+ bb_copyfd_eof(src_fd, fd);
+ close(fd);
+ xrename(new_fname, pas->pw_name);
+ } else {
+ bb_error_msg("can't create %s/%s",
+ crontab_dir, new_fname);
+ }
+ if (tmp_fname)
+ unlink(tmp_fname);
+ /*free(tmp_fname);*/
+ /*free(new_fname);*/
+
+ } /* switch */
+
+ /* Bump notification file. Handle window where crond picks file up
+ * before we can write our entry out.
+ */
+ while ((fd = open(CRONUPDATE, O_WRONLY|O_CREAT|O_APPEND, 0600)) >= 0) {
+ struct stat st;
+
+ fdprintf(fd, "%s\n", pas->pw_name);
+ if (fstat(fd, &st) != 0 || st.st_nlink != 0) {
+ /*close(fd);*/
+ break;
+ }
+ /* st.st_nlink == 0:
+ * file was deleted, maybe crond missed our notification */
+ close(fd);
+ /* loop */
+ }
+ if (fd < 0) {
+ bb_error_msg("can't append to %s/%s",
+ crontab_dir, CRONUPDATE);
+ }
+ return 0;
+}