807 lines
23 KiB
C
807 lines
23 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering, Kay Sievers
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <limits.h>
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#include <dirent.h>
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#include <grp.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <getopt.h>
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#include <stdbool.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include "log.h"
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#include "util.h"
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#include "strv.h"
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#include "label.h"
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#include "set.h"
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/* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
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* them in the file system. This is intended to be used to create
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* properly owned directories beneath /tmp, /var/tmp, /var/run and
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* /var/lock which are volatile and hence need to be recreated on
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* bootup. */
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enum {
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CREATE_FILE = 'f',
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TRUNCATE_FILE = 'F',
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CREATE_DIRECTORY = 'd',
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TRUNCATE_DIRECTORY = 'D',
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IGNORE_PATH = 'x',
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REMOVE_PATH = 'r',
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RECURSIVE_REMOVE_PATH = 'R'
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};
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typedef struct Item {
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char type;
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char *path;
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uid_t uid;
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gid_t gid;
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mode_t mode;
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usec_t age;
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bool uid_set:1;
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bool gid_set:1;
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bool mode_set:1;
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bool age_set:1;
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} Item;
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static Hashmap *items = NULL;
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static bool arg_create = false;
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static bool arg_clean = false;
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static bool arg_remove = false;
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#define MAX_DEPTH 256
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static int dir_cleanup(
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const char *p,
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DIR *d,
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const struct stat *ds,
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usec_t cutoff,
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dev_t rootdev,
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bool mountpoint,
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int maxdepth)
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{
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struct dirent *dent;
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struct timespec times[2];
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bool deleted = false;
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char *sub_path = NULL;
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int r = 0;
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while ((dent = readdir(d))) {
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struct stat s;
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usec_t age;
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if (streq(dent->d_name, ".") ||
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streq(dent->d_name, ".."))
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continue;
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if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {
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if (errno != ENOENT) {
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log_error("stat(%s/%s) failed: %m", p, dent->d_name);
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r = -errno;
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}
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continue;
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}
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/* Stay on the same filesystem */
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if (s.st_dev != rootdev)
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continue;
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/* Do not delete read-only files owned by root */
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if (s.st_uid == 0 && !(s.st_mode & S_IWUSR))
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continue;
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free(sub_path);
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sub_path = NULL;
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if (asprintf(&sub_path, "%s/%s", p, dent->d_name) < 0) {
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log_error("Out of memory");
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r = -ENOMEM;
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goto finish;
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}
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/* Is there an item configured for this path? */
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if (hashmap_get(items, sub_path))
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continue;
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if (S_ISDIR(s.st_mode)) {
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if (mountpoint &&
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streq(dent->d_name, "lost+found") &&
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s.st_uid == 0)
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continue;
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if (maxdepth <= 0)
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log_warning("Reached max depth on %s.", sub_path);
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else {
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DIR *sub_dir;
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int q;
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sub_dir = xopendirat(dirfd(d), dent->d_name);
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if (sub_dir == NULL) {
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if (errno != ENOENT) {
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log_error("opendir(%s/%s) failed: %m", p, dent->d_name);
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r = -errno;
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}
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continue;
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}
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q = dir_cleanup(sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1);
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closedir(sub_dir);
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if (q < 0)
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r = q;
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}
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/* Ignore ctime, we change it when deleting */
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age = MAX(timespec_load(&s.st_mtim),
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timespec_load(&s.st_atim));
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if (age >= cutoff)
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continue;
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log_debug("rmdir '%s'\n", sub_path);
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if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0) {
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if (errno != ENOENT && errno != ENOTEMPTY) {
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log_error("rmdir(%s): %m", sub_path);
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r = -errno;
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}
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}
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} else {
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/* Skip files for which the sticky bit is
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* set. These are semantics we define, and are
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* unknown elsewhere. See XDG_RUNTIME_DIR
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* specification for details. */
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if (s.st_mode & S_ISVTX)
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continue;
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if (mountpoint) {
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if (streq(dent->d_name, ".journal") &&
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s.st_uid == 0)
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continue;
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if (streq(dent->d_name, "aquota.user") ||
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streq(dent->d_name, "aquota.group"))
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continue;
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}
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age = MAX3(timespec_load(&s.st_mtim),
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timespec_load(&s.st_atim),
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timespec_load(&s.st_ctim));
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if (age >= cutoff)
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continue;
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log_debug("unlink '%s'\n", sub_path);
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if (unlinkat(dirfd(d), dent->d_name, 0) < 0) {
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if (errno != ENOENT) {
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log_error("unlink(%s): %m", sub_path);
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r = -errno;
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}
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}
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deleted = true;
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}
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}
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finish:
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if (deleted) {
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/* Restore original directory timestamps */
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times[0] = ds->st_atim;
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times[1] = ds->st_mtim;
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if (futimens(dirfd(d), times) < 0)
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log_error("utimensat(%s): %m", p);
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}
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free(sub_path);
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return r;
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}
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static int clean_item(Item *i) {
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DIR *d;
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struct stat s, ps;
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bool mountpoint;
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int r;
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usec_t cutoff, n;
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assert(i);
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if (i->type != CREATE_DIRECTORY &&
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i->type != TRUNCATE_DIRECTORY &&
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i->type != IGNORE_PATH)
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return 0;
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if (!i->age_set || i->age <= 0)
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return 0;
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n = now(CLOCK_REALTIME);
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if (n < i->age)
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return 0;
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cutoff = n - i->age;
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d = opendir(i->path);
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if (!d) {
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if (errno == ENOENT)
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return 0;
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log_error("Failed to open directory %s: %m", i->path);
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return -errno;
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}
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if (fstat(dirfd(d), &s) < 0) {
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log_error("stat(%s) failed: %m", i->path);
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r = -errno;
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goto finish;
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}
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if (!S_ISDIR(s.st_mode)) {
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log_error("%s is not a directory.", i->path);
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r = -ENOTDIR;
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goto finish;
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}
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if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0) {
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log_error("stat(%s/..) failed: %m", i->path);
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r = -errno;
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goto finish;
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}
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mountpoint = s.st_dev != ps.st_dev ||
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(s.st_dev == ps.st_dev && s.st_ino == ps.st_ino);
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r = dir_cleanup(i->path, d, &s, cutoff, s.st_dev, mountpoint, MAX_DEPTH);
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finish:
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if (d)
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closedir(d);
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return r;
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}
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static int create_item(Item *i) {
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int fd = -1, r;
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mode_t u;
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struct stat st;
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assert(i);
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switch (i->type) {
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case IGNORE_PATH:
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case REMOVE_PATH:
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case RECURSIVE_REMOVE_PATH:
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return 0;
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case CREATE_FILE:
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case TRUNCATE_FILE:
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u = umask(0);
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fd = open(i->path, O_CREAT|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY|O_NOFOLLOW|
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(i->type == TRUNCATE_FILE ? O_TRUNC : 0), i->mode);
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umask(u);
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if (fd < 0) {
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log_error("Failed to create file %s: %m", i->path);
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r = -errno;
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goto finish;
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}
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if (fstat(fd, &st) < 0) {
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log_error("stat(%s) failed: %m", i->path);
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r = -errno;
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goto finish;
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}
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if (!S_ISREG(st.st_mode)) {
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log_error("%s is not a file.", i->path);
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r = -EEXIST;
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goto finish;
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}
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if (i->mode_set)
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if (fchmod(fd, i->mode) < 0) {
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log_error("chmod(%s) failed: %m", i->path);
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r = -errno;
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goto finish;
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}
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if (i->uid_set || i->gid_set)
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if (fchown(fd,
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i->uid_set ? i->uid : (uid_t) -1,
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i->gid_set ? i->gid : (gid_t) -1) < 0) {
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log_error("chown(%s) failed: %m", i->path);
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r = -errno;
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goto finish;
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}
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break;
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case TRUNCATE_DIRECTORY:
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case CREATE_DIRECTORY:
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u = umask(0);
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r = mkdir(i->path, i->mode);
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umask(u);
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if (r < 0 && errno != EEXIST) {
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log_error("Failed to create directory %s: %m", i->path);
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r = -errno;
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goto finish;
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}
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if (stat(i->path, &st) < 0) {
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log_error("stat(%s) failed: %m", i->path);
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r = -errno;
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goto finish;
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}
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if (!S_ISDIR(st.st_mode)) {
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log_error("%s is not a directory.", i->path);
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r = -EEXIST;
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goto finish;
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}
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if (i->mode_set)
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if (chmod(i->path, i->mode) < 0) {
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log_error("chmod(%s) failed: %m", i->path);
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r = -errno;
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goto finish;
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}
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if (i->uid_set || i->gid_set)
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if (chown(i->path,
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i->uid_set ? i->uid : (uid_t) -1,
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i->gid_set ? i->gid : (gid_t) -1) < 0) {
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log_error("chown(%s) failed: %m", i->path);
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r = -errno;
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goto finish;
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}
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break;
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}
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if ((r = label_fix(i->path)) < 0)
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goto finish;
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log_debug("%s created successfully.", i->path);
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finish:
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if (fd >= 0)
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close_nointr_nofail(fd);
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return r;
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}
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static int remove_item(Item *i) {
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int r;
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assert(i);
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switch (i->type) {
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case CREATE_FILE:
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case TRUNCATE_FILE:
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case CREATE_DIRECTORY:
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case IGNORE_PATH:
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break;
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case REMOVE_PATH:
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if (remove(i->path) < 0 && errno != ENOENT) {
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log_error("remove(%s): %m", i->path);
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return -errno;
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}
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break;
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case TRUNCATE_DIRECTORY:
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case RECURSIVE_REMOVE_PATH:
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if ((r = rm_rf(i->path, false, i->type == RECURSIVE_REMOVE_PATH)) < 0 &&
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r != -ENOENT) {
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log_error("rm_rf(%s): %s", i->path, strerror(-r));
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return r;
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}
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break;
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}
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return 0;
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}
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static int process_item(Item *i) {
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int r, q, p;
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assert(i);
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r = arg_create ? create_item(i) : 0;
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q = arg_remove ? remove_item(i) : 0;
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p = arg_clean ? clean_item(i) : 0;
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if (r < 0)
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return r;
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if (q < 0)
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return q;
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return p;
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}
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static void item_free(Item *i) {
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assert(i);
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free(i->path);
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free(i);
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}
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static int parse_line(const char *fname, unsigned line, const char *buffer, const char *prefix) {
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Item *i;
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char *mode = NULL, *user = NULL, *group = NULL, *age = NULL;
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int r, n;
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assert(fname);
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assert(line >= 1);
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assert(buffer);
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if (!(i = new0(Item, 1))) {
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log_error("Out of memory");
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return -ENOMEM;
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}
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if ((n = sscanf(buffer,
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"%c "
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"%ms "
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"%ms "
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"%ms "
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"%ms "
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"%ms",
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&i->type,
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&i->path,
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&mode,
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&user,
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&group,
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&age)) < 2) {
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log_error("[%s:%u] Syntax error.", fname, line);
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r = -EIO;
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goto finish;
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}
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if (i->type != CREATE_FILE &&
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i->type != TRUNCATE_FILE &&
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i->type != CREATE_DIRECTORY &&
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i->type != TRUNCATE_DIRECTORY &&
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i->type != IGNORE_PATH &&
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i->type != REMOVE_PATH &&
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i->type != RECURSIVE_REMOVE_PATH) {
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log_error("[%s:%u] Unknown file type '%c'.", fname, line, i->type);
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r = -EBADMSG;
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goto finish;
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}
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if (!path_is_absolute(i->path)) {
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log_error("[%s:%u] Path '%s' not absolute.", fname, line, i->path);
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r = -EBADMSG;
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goto finish;
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}
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path_kill_slashes(i->path);
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if (prefix && !path_startswith(i->path, prefix)) {
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r = 0;
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goto finish;
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}
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if (user && !streq(user, "-")) {
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unsigned long lu;
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struct passwd *p;
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if (streq(user, "root") || streq(user, "0"))
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i->uid = 0;
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else if (safe_atolu(user, &lu) >= 0)
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i->uid = (uid_t) lu;
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else if ((p = getpwnam(user)))
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i->uid = p->pw_uid;
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else {
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log_error("[%s:%u] Unknown user '%s'.", fname, line, user);
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r = -ENOENT;
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goto finish;
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}
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i->uid_set = true;
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}
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if (group && !streq(group, "-")) {
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unsigned long lu;
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struct group *g;
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if (streq(group, "root") || streq(group, "0"))
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i->gid = 0;
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else if (safe_atolu(group, &lu) >= 0)
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i->gid = (gid_t) lu;
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else if ((g = getgrnam(group)))
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i->gid = g->gr_gid;
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else {
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log_error("[%s:%u] Unknown group '%s'.", fname, line, group);
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r = -ENOENT;
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goto finish;
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}
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i->gid_set = true;
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}
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if (mode && !streq(mode, "-")) {
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unsigned m;
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if (sscanf(mode, "%o", &m) != 1) {
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log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);
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r = -ENOENT;
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goto finish;
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}
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|
|
i->mode = m;
|
|
i->mode_set = true;
|
|
} else
|
|
i->mode = i->type == CREATE_DIRECTORY ? 0755 : 0644;
|
|
|
|
if (age && !streq(age, "-")) {
|
|
if (parse_usec(age, &i->age) < 0) {
|
|
log_error("[%s:%u] Invalid age '%s'.", fname, line, age);
|
|
r = -EBADMSG;
|
|
goto finish;
|
|
}
|
|
|
|
i->age_set = true;
|
|
}
|
|
|
|
if ((r = hashmap_put(items, i->path, i)) < 0) {
|
|
log_error("Failed to insert item %s: %s", i->path, strerror(-r));
|
|
goto finish;
|
|
}
|
|
|
|
i = NULL;
|
|
r = 0;
|
|
|
|
finish:
|
|
free(user);
|
|
free(group);
|
|
free(mode);
|
|
free(age);
|
|
|
|
if (i)
|
|
item_free(i);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int scandir_filter(const struct dirent *d) {
|
|
assert(d);
|
|
|
|
if (ignore_file(d->d_name))
|
|
return 0;
|
|
|
|
if (d->d_type != DT_REG &&
|
|
d->d_type != DT_LNK)
|
|
return 0;
|
|
|
|
return endswith(d->d_name, ".conf");
|
|
}
|
|
|
|
static int help(void) {
|
|
|
|
printf("%s [OPTIONS...]\n\n"
|
|
"Create and clean up temporary directories.\n\n"
|
|
" -h --help Show this help\n"
|
|
" --create Create marked files/directories\n"
|
|
" --clean Clean up marked directories\n"
|
|
" --remove Remove marked files/directories\n",
|
|
program_invocation_short_name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_argv(int argc, char *argv[]) {
|
|
|
|
enum {
|
|
ARG_CREATE,
|
|
ARG_CLEAN,
|
|
ARG_REMOVE
|
|
};
|
|
|
|
static const struct option options[] = {
|
|
{ "help", no_argument, NULL, 'h' },
|
|
{ "create", no_argument, NULL, ARG_CREATE },
|
|
{ "clean", no_argument, NULL, ARG_CLEAN },
|
|
{ "remove", no_argument, NULL, ARG_REMOVE },
|
|
{ NULL, 0, NULL, 0 }
|
|
};
|
|
|
|
int c;
|
|
|
|
assert(argc >= 0);
|
|
assert(argv);
|
|
|
|
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
|
|
|
|
switch (c) {
|
|
|
|
case 'h':
|
|
help();
|
|
return 0;
|
|
|
|
case ARG_CREATE:
|
|
arg_create = true;
|
|
break;
|
|
|
|
case ARG_CLEAN:
|
|
arg_clean = true;
|
|
break;
|
|
|
|
case ARG_REMOVE:
|
|
arg_remove = true;
|
|
break;
|
|
|
|
case '?':
|
|
return -EINVAL;
|
|
|
|
default:
|
|
log_error("Unknown option code %c", c);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (!arg_clean && !arg_create && !arg_remove) {
|
|
help();
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
struct dirent **de = NULL;
|
|
int r, n, j;
|
|
const char *prefix = NULL;
|
|
Item *i;
|
|
Iterator iterator;
|
|
|
|
if ((r = parse_argv(argc, argv)) <= 0)
|
|
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
|
|
if (optind < argc)
|
|
prefix = argv[optind];
|
|
else
|
|
prefix = "/";
|
|
|
|
log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
label_init();
|
|
|
|
if (!(items = hashmap_new(string_hash_func, string_compare_func))) {
|
|
log_error("Out of memory");
|
|
r = EXIT_FAILURE;
|
|
goto finish;
|
|
}
|
|
|
|
if ((n = scandir("/etc/tmpfiles.d/", &de, scandir_filter, alphasort)) < 0) {
|
|
|
|
if (errno == ENOENT)
|
|
r = EXIT_SUCCESS;
|
|
else {
|
|
log_error("Failed to enumerate /etc/tmpfiles.d/ files: %m");
|
|
r = EXIT_FAILURE;
|
|
}
|
|
|
|
goto finish;
|
|
}
|
|
|
|
r = EXIT_SUCCESS;
|
|
|
|
for (j = 0; j < n; j++) {
|
|
int k;
|
|
char *fn;
|
|
FILE *f;
|
|
unsigned v;
|
|
|
|
k = asprintf(&fn, "/etc/tmpfiles.d/%s", de[j]->d_name);
|
|
free(de[j]);
|
|
|
|
if (k < 0) {
|
|
log_error("Failed to allocate file name.");
|
|
r = EXIT_FAILURE;
|
|
continue;
|
|
}
|
|
|
|
if (!(f = fopen(fn, "re"))) {
|
|
|
|
if (errno != ENOENT) {
|
|
log_error("Failed to open %s: %m", fn);
|
|
r = EXIT_FAILURE;
|
|
}
|
|
|
|
free(fn);
|
|
continue;
|
|
}
|
|
|
|
v = 0;
|
|
for (;;) {
|
|
char line[LINE_MAX], *l;
|
|
|
|
if (!(fgets(line, sizeof(line), f)))
|
|
break;
|
|
|
|
v++;
|
|
|
|
l = strstrip(line);
|
|
if (*l == '#' || *l == 0)
|
|
continue;
|
|
|
|
if (parse_line(fn, v, l, prefix) < 0)
|
|
r = EXIT_FAILURE;
|
|
}
|
|
|
|
if (ferror(f)) {
|
|
r = EXIT_FAILURE;
|
|
log_error("Failed to read from file %s: %m", fn);
|
|
}
|
|
|
|
free(fn);
|
|
|
|
fclose(f);
|
|
}
|
|
|
|
free(de);
|
|
|
|
HASHMAP_FOREACH(i, items, iterator)
|
|
if (process_item(i) < 0)
|
|
r = EXIT_FAILURE;
|
|
|
|
finish:
|
|
while ((i = hashmap_steal_first(items)))
|
|
item_free(i);
|
|
|
|
hashmap_free(items);
|
|
|
|
label_finish();
|
|
|
|
return r;
|
|
}
|