974 lines
27 KiB
C
974 lines
27 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2010-2012 Lennart Poettering
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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 <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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/* When we include libgen.h because we need dirname() we immediately
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* undefine basename() since libgen.h defines it as a macro to the
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* POSIX version which is really broken. We prefer GNU basename(). */
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#include <libgen.h>
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#undef basename
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#include "alloc-util.h"
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#include "extract-word.h"
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#include "fs-util.h"
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#include "glob-util.h"
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#include "log.h"
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#include "macro.h"
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#include "missing.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "stat-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "time-util.h"
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bool path_is_absolute(const char *p) {
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return p[0] == '/';
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}
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bool is_path(const char *p) {
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return !!strchr(p, '/');
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}
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int path_split_and_make_absolute(const char *p, char ***ret) {
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char **l;
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int r;
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assert(p);
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assert(ret);
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l = strv_split(p, ":");
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if (!l)
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return -ENOMEM;
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r = path_strv_make_absolute_cwd(l);
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if (r < 0) {
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strv_free(l);
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return r;
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}
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*ret = l;
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return r;
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}
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char *path_make_absolute(const char *p, const char *prefix) {
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assert(p);
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/* Makes every item in the list an absolute path by prepending
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* the prefix, if specified and necessary */
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if (path_is_absolute(p) || isempty(prefix))
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return strdup(p);
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if (endswith(prefix, "/"))
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return strjoin(prefix, p);
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else
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return strjoin(prefix, "/", p);
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}
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int safe_getcwd(char **ret) {
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char *cwd;
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cwd = get_current_dir_name();
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if (!cwd)
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return negative_errno();
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/* Let's make sure the directory is really absolute, to protect us from the logic behind
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* CVE-2018-1000001 */
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if (cwd[0] != '/') {
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free(cwd);
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return -ENOMEDIUM;
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}
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*ret = cwd;
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return 0;
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}
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int path_make_absolute_cwd(const char *p, char **ret) {
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char *c;
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int r;
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assert(p);
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assert(ret);
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/* Similar to path_make_absolute(), but prefixes with the
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* current working directory. */
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if (path_is_absolute(p))
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c = strdup(p);
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else {
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_cleanup_free_ char *cwd = NULL;
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r = safe_getcwd(&cwd);
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if (r < 0)
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return r;
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if (endswith(cwd, "/"))
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c = strjoin(cwd, p);
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else
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c = strjoin(cwd, "/", p);
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}
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if (!c)
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return -ENOMEM;
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*ret = c;
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return 0;
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}
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int path_make_relative(const char *from_dir, const char *to_path, char **_r) {
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char *r, *p;
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unsigned n_parents;
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assert(from_dir);
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assert(to_path);
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assert(_r);
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/* Strips the common part, and adds ".." elements as necessary. */
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if (!path_is_absolute(from_dir))
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return -EINVAL;
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if (!path_is_absolute(to_path))
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return -EINVAL;
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/* Skip the common part. */
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for (;;) {
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size_t a, b;
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from_dir += strspn(from_dir, "/");
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to_path += strspn(to_path, "/");
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if (!*from_dir) {
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if (!*to_path)
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/* from_dir equals to_path. */
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r = strdup(".");
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else
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/* from_dir is a parent directory of to_path. */
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r = strdup(to_path);
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if (!r)
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return -ENOMEM;
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path_kill_slashes(r);
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*_r = r;
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return 0;
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}
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if (!*to_path)
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break;
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a = strcspn(from_dir, "/");
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b = strcspn(to_path, "/");
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if (a != b)
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break;
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if (memcmp(from_dir, to_path, a) != 0)
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break;
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from_dir += a;
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to_path += b;
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}
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/* If we're here, then "from_dir" has one or more elements that need to
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* be replaced with "..". */
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/* Count the number of necessary ".." elements. */
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for (n_parents = 0;;) {
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size_t w;
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from_dir += strspn(from_dir, "/");
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if (!*from_dir)
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break;
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w = strcspn(from_dir, "/");
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/* If this includes ".." we can't do a simple series of "..", refuse */
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if (w == 2 && from_dir[0] == '.' && from_dir[1] == '.')
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return -EINVAL;
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/* Count number of elements, except if they are "." */
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if (w != 1 || from_dir[0] != '.')
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n_parents++;
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from_dir += w;
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}
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r = new(char, n_parents * 3 + strlen(to_path) + 1);
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if (!r)
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return -ENOMEM;
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for (p = r; n_parents > 0; n_parents--)
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p = mempcpy(p, "../", 3);
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strcpy(p, to_path);
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path_kill_slashes(r);
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*_r = r;
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return 0;
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}
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int path_strv_make_absolute_cwd(char **l) {
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char **s;
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int r;
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/* Goes through every item in the string list and makes it
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* absolute. This works in place and won't rollback any
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* changes on failure. */
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STRV_FOREACH(s, l) {
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char *t;
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r = path_make_absolute_cwd(*s, &t);
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if (r < 0)
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return r;
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path_kill_slashes(t);
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free_and_replace(*s, t);
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}
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return 0;
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}
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char **path_strv_resolve(char **l, const char *root) {
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char **s;
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unsigned k = 0;
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bool enomem = false;
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int r;
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if (strv_isempty(l))
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return l;
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/* Goes through every item in the string list and canonicalize
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* the path. This works in place and won't rollback any
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* changes on failure. */
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STRV_FOREACH(s, l) {
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_cleanup_free_ char *orig = NULL;
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char *t, *u;
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if (!path_is_absolute(*s)) {
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free(*s);
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continue;
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}
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if (root) {
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orig = *s;
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t = prefix_root(root, orig);
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if (!t) {
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enomem = true;
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continue;
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}
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} else
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t = *s;
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r = chase_symlinks(t, root, 0, &u);
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if (r == -ENOENT) {
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if (root) {
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u = TAKE_PTR(orig);
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free(t);
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} else
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u = t;
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} else if (r < 0) {
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free(t);
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if (r == -ENOMEM)
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enomem = true;
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continue;
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} else if (root) {
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char *x;
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free(t);
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x = path_startswith(u, root);
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if (x) {
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/* restore the slash if it was lost */
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if (!startswith(x, "/"))
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*(--x) = '/';
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t = strdup(x);
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free(u);
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if (!t) {
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enomem = true;
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continue;
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}
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u = t;
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} else {
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/* canonicalized path goes outside of
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* prefix, keep the original path instead */
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free_and_replace(u, orig);
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}
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} else
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free(t);
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l[k++] = u;
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}
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l[k] = NULL;
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if (enomem)
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return NULL;
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return l;
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}
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char **path_strv_resolve_uniq(char **l, const char *root) {
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if (strv_isempty(l))
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return l;
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if (!path_strv_resolve(l, root))
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return NULL;
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return strv_uniq(l);
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}
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char *path_kill_slashes(char *path) {
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char *f, *t;
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bool slash = false;
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/* Removes redundant inner and trailing slashes. Modifies the
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* passed string in-place.
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*
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* ///foo///bar/ becomes /foo/bar
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*/
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for (f = path, t = path; *f; f++) {
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if (*f == '/') {
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slash = true;
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continue;
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}
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if (slash) {
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slash = false;
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*(t++) = '/';
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}
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*(t++) = *f;
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}
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/* Special rule, if we are talking of the root directory, a
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trailing slash is good */
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if (t == path && slash)
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*(t++) = '/';
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*t = 0;
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return path;
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}
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char* path_startswith(const char *path, const char *prefix) {
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assert(path);
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assert(prefix);
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/* Returns a pointer to the start of the first component after the parts matched by
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* the prefix, iff
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* - both paths are absolute or both paths are relative,
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* and
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* - each component in prefix in turn matches a component in path at the same position.
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* An empty string will be returned when the prefix and path are equivalent.
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*
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* Returns NULL otherwise.
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*/
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if ((path[0] == '/') != (prefix[0] == '/'))
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return NULL;
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for (;;) {
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size_t a, b;
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path += strspn(path, "/");
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prefix += strspn(prefix, "/");
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if (*prefix == 0)
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return (char*) path;
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if (*path == 0)
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return NULL;
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a = strcspn(path, "/");
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b = strcspn(prefix, "/");
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if (a != b)
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return NULL;
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if (memcmp(path, prefix, a) != 0)
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return NULL;
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path += a;
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prefix += b;
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}
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}
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int path_compare(const char *a, const char *b) {
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int d;
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assert(a);
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assert(b);
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/* A relative path and an abolute path must not compare as equal.
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* Which one is sorted before the other does not really matter.
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* Here a relative path is ordered before an absolute path. */
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d = (a[0] == '/') - (b[0] == '/');
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if (d != 0)
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return d;
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for (;;) {
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size_t j, k;
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a += strspn(a, "/");
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b += strspn(b, "/");
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if (*a == 0 && *b == 0)
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return 0;
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/* Order prefixes first: "/foo" before "/foo/bar" */
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if (*a == 0)
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return -1;
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if (*b == 0)
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return 1;
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j = strcspn(a, "/");
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k = strcspn(b, "/");
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/* Alphabetical sort: "/foo/aaa" before "/foo/b" */
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d = memcmp(a, b, MIN(j, k));
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if (d != 0)
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return (d > 0) - (d < 0); /* sign of d */
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/* Sort "/foo/a" before "/foo/aaa" */
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d = (j > k) - (j < k); /* sign of (j - k) */
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if (d != 0)
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return d;
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a += j;
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b += k;
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}
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}
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bool path_equal(const char *a, const char *b) {
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return path_compare(a, b) == 0;
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}
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bool path_equal_or_files_same(const char *a, const char *b, int flags) {
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return path_equal(a, b) || files_same(a, b, flags) > 0;
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}
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char* path_join(const char *root, const char *path, const char *rest) {
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assert(path);
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if (!isempty(root))
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return strjoin(root, endswith(root, "/") ? "" : "/",
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path[0] == '/' ? path+1 : path,
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rest ? (endswith(path, "/") ? "" : "/") : NULL,
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rest && rest[0] == '/' ? rest+1 : rest);
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else
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return strjoin(path,
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rest ? (endswith(path, "/") ? "" : "/") : NULL,
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rest && rest[0] == '/' ? rest+1 : rest);
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}
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int find_binary(const char *name, char **ret) {
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int last_error, r;
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const char *p;
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assert(name);
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|
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if (is_path(name)) {
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if (access(name, X_OK) < 0)
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return -errno;
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if (ret) {
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r = path_make_absolute_cwd(name, ret);
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if (r < 0)
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return r;
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}
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return 0;
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}
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|
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/**
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* Plain getenv, not secure_getenv, because we want
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* to actually allow the user to pick the binary.
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*/
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p = getenv("PATH");
|
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if (!p)
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p = DEFAULT_PATH;
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last_error = -ENOENT;
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|
|
for (;;) {
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_cleanup_free_ char *j = NULL, *element = NULL;
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r = extract_first_word(&p, &element, ":", EXTRACT_RELAX|EXTRACT_DONT_COALESCE_SEPARATORS);
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if (r < 0)
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return r;
|
|
if (r == 0)
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break;
|
|
|
|
if (!path_is_absolute(element))
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|
continue;
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|
|
j = strjoin(element, "/", name);
|
|
if (!j)
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|
return -ENOMEM;
|
|
|
|
if (access(j, X_OK) >= 0) {
|
|
/* Found it! */
|
|
|
|
if (ret) {
|
|
*ret = path_kill_slashes(j);
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|
j = NULL;
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|
}
|
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|
|
return 0;
|
|
}
|
|
|
|
last_error = -errno;
|
|
}
|
|
|
|
return last_error;
|
|
}
|
|
|
|
bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool update) {
|
|
bool changed = false;
|
|
const char* const* i;
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|
|
assert(timestamp);
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|
|
if (!paths)
|
|
return false;
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|
|
STRV_FOREACH(i, paths) {
|
|
struct stat stats;
|
|
usec_t u;
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|
|
if (stat(*i, &stats) < 0)
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continue;
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|
u = timespec_load(&stats.st_mtim);
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|
|
/* first check */
|
|
if (*timestamp >= u)
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continue;
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|
log_debug("timestamp of '%s' changed", *i);
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|
|
/* update timestamp */
|
|
if (update) {
|
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*timestamp = u;
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changed = true;
|
|
} else
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|
return true;
|
|
}
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|
|
return changed;
|
|
}
|
|
|
|
static int binary_is_good(const char *binary) {
|
|
_cleanup_free_ char *p = NULL, *d = NULL;
|
|
int r;
|
|
|
|
r = find_binary(binary, &p);
|
|
if (r == -ENOENT)
|
|
return 0;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* An fsck that is linked to /bin/true is a non-existent
|
|
* fsck */
|
|
|
|
r = readlink_malloc(p, &d);
|
|
if (r == -EINVAL) /* not a symlink */
|
|
return 1;
|
|
if (r < 0)
|
|
return r;
|
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|
|
return !PATH_IN_SET(d, "true"
|
|
"/bin/true",
|
|
"/usr/bin/true",
|
|
"/dev/null");
|
|
}
|
|
|
|
int fsck_exists(const char *fstype) {
|
|
const char *checker;
|
|
|
|
assert(fstype);
|
|
|
|
if (streq(fstype, "auto"))
|
|
return -EINVAL;
|
|
|
|
checker = strjoina("fsck.", fstype);
|
|
return binary_is_good(checker);
|
|
}
|
|
|
|
int mkfs_exists(const char *fstype) {
|
|
const char *mkfs;
|
|
|
|
assert(fstype);
|
|
|
|
if (streq(fstype, "auto"))
|
|
return -EINVAL;
|
|
|
|
mkfs = strjoina("mkfs.", fstype);
|
|
return binary_is_good(mkfs);
|
|
}
|
|
|
|
char *prefix_root(const char *root, const char *path) {
|
|
char *n, *p;
|
|
size_t l;
|
|
|
|
/* If root is passed, prefixes path with it. Otherwise returns
|
|
* it as is. */
|
|
|
|
assert(path);
|
|
|
|
/* First, drop duplicate prefixing slashes from the path */
|
|
while (path[0] == '/' && path[1] == '/')
|
|
path++;
|
|
|
|
if (isempty(root) || path_equal(root, "/"))
|
|
return strdup(path);
|
|
|
|
l = strlen(root) + 1 + strlen(path) + 1;
|
|
|
|
n = new(char, l);
|
|
if (!n)
|
|
return NULL;
|
|
|
|
p = stpcpy(n, root);
|
|
|
|
while (p > n && p[-1] == '/')
|
|
p--;
|
|
|
|
if (path[0] != '/')
|
|
*(p++) = '/';
|
|
|
|
strcpy(p, path);
|
|
return n;
|
|
}
|
|
|
|
int parse_path_argument_and_warn(const char *path, bool suppress_root, char **arg) {
|
|
char *p;
|
|
int r;
|
|
|
|
/*
|
|
* This function is intended to be used in command line
|
|
* parsers, to handle paths that are passed in. It makes the
|
|
* path absolute, and reduces it to NULL if omitted or
|
|
* root (the latter optionally).
|
|
*
|
|
* NOTE THAT THIS WILL FREE THE PREVIOUS ARGUMENT POINTER ON
|
|
* SUCCESS! Hence, do not pass in uninitialized pointers.
|
|
*/
|
|
|
|
if (isempty(path)) {
|
|
*arg = mfree(*arg);
|
|
return 0;
|
|
}
|
|
|
|
r = path_make_absolute_cwd(path, &p);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to parse path \"%s\" and make it absolute: %m", path);
|
|
|
|
path_kill_slashes(p);
|
|
if (suppress_root && path_equal(p, "/"))
|
|
p = mfree(p);
|
|
|
|
free(*arg);
|
|
*arg = p;
|
|
return 0;
|
|
}
|
|
|
|
char* dirname_malloc(const char *path) {
|
|
char *d, *dir, *dir2;
|
|
|
|
assert(path);
|
|
|
|
d = strdup(path);
|
|
if (!d)
|
|
return NULL;
|
|
|
|
dir = dirname(d);
|
|
assert(dir);
|
|
|
|
if (dir == d)
|
|
return d;
|
|
|
|
dir2 = strdup(dir);
|
|
free(d);
|
|
|
|
return dir2;
|
|
}
|
|
|
|
const char *last_path_component(const char *path) {
|
|
/* Finds the last component of the path, preserving the
|
|
* optional trailing slash that signifies a directory.
|
|
* a/b/c → c
|
|
* a/b/c/ → c/
|
|
* / → /
|
|
* // → /
|
|
* /foo/a → a
|
|
* /foo/a/ → a/
|
|
* This is different than basename, which returns "" when
|
|
* a trailing slash is present.
|
|
*/
|
|
|
|
unsigned l, k;
|
|
|
|
l = k = strlen(path);
|
|
if (l == 0) /* special case — an empty string */
|
|
return path;
|
|
|
|
while (k > 0 && path[k-1] == '/')
|
|
k--;
|
|
|
|
if (k == 0) /* the root directory */
|
|
return path + l - 1;
|
|
|
|
while (k > 0 && path[k-1] != '/')
|
|
k--;
|
|
|
|
return path + k;
|
|
}
|
|
|
|
bool filename_is_valid(const char *p) {
|
|
const char *e;
|
|
|
|
if (isempty(p))
|
|
return false;
|
|
|
|
if (dot_or_dot_dot(p))
|
|
return false;
|
|
|
|
e = strchrnul(p, '/');
|
|
if (*e != 0)
|
|
return false;
|
|
|
|
if (e - p > FILENAME_MAX)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool path_is_normalized(const char *p) {
|
|
|
|
if (isempty(p))
|
|
return false;
|
|
|
|
if (dot_or_dot_dot(p))
|
|
return false;
|
|
|
|
if (startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../"))
|
|
return false;
|
|
|
|
if (strlen(p)+1 > PATH_MAX)
|
|
return false;
|
|
|
|
if (startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./"))
|
|
return false;
|
|
|
|
if (strstr(p, "//"))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
char *file_in_same_dir(const char *path, const char *filename) {
|
|
char *e, *ret;
|
|
size_t k;
|
|
|
|
assert(path);
|
|
assert(filename);
|
|
|
|
/* This removes the last component of path and appends
|
|
* filename, unless the latter is absolute anyway or the
|
|
* former isn't */
|
|
|
|
if (path_is_absolute(filename))
|
|
return strdup(filename);
|
|
|
|
e = strrchr(path, '/');
|
|
if (!e)
|
|
return strdup(filename);
|
|
|
|
k = strlen(filename);
|
|
ret = new(char, (e + 1 - path) + k + 1);
|
|
if (!ret)
|
|
return NULL;
|
|
|
|
memcpy(mempcpy(ret, path, e + 1 - path), filename, k + 1);
|
|
return ret;
|
|
}
|
|
|
|
bool hidden_or_backup_file(const char *filename) {
|
|
const char *p;
|
|
|
|
assert(filename);
|
|
|
|
if (filename[0] == '.' ||
|
|
streq(filename, "lost+found") ||
|
|
streq(filename, "aquota.user") ||
|
|
streq(filename, "aquota.group") ||
|
|
endswith(filename, "~"))
|
|
return true;
|
|
|
|
p = strrchr(filename, '.');
|
|
if (!p)
|
|
return false;
|
|
|
|
/* Please, let's not add more entries to the list below. If external projects think it's a good idea to come up
|
|
* with always new suffixes and that everybody else should just adjust to that, then it really should be on
|
|
* them. Hence, in future, let's not add any more entries. Instead, let's ask those packages to instead adopt
|
|
* one of the generic suffixes/prefixes for hidden files or backups, possibly augmented with an additional
|
|
* string. Specifically: there's now:
|
|
*
|
|
* The generic suffixes "~" and ".bak" for backup files
|
|
* The generic prefix "." for hidden files
|
|
*
|
|
* Thus, if a new package manager "foopkg" wants its own set of ".foopkg-new", ".foopkg-old", ".foopkg-dist"
|
|
* or so registered, let's refuse that and ask them to use ".foopkg.new", ".foopkg.old" or ".foopkg~" instead.
|
|
*/
|
|
|
|
return STR_IN_SET(p + 1,
|
|
"rpmnew",
|
|
"rpmsave",
|
|
"rpmorig",
|
|
"dpkg-old",
|
|
"dpkg-new",
|
|
"dpkg-tmp",
|
|
"dpkg-dist",
|
|
"dpkg-bak",
|
|
"dpkg-backup",
|
|
"dpkg-remove",
|
|
"ucf-new",
|
|
"ucf-old",
|
|
"ucf-dist",
|
|
"swp",
|
|
"bak",
|
|
"old",
|
|
"new");
|
|
}
|
|
|
|
bool is_device_path(const char *path) {
|
|
|
|
/* Returns true on paths that refer to a device, either in
|
|
* sysfs or in /dev */
|
|
|
|
return path_startswith(path, "/dev/") ||
|
|
path_startswith(path, "/sys/");
|
|
}
|
|
|
|
bool is_deviceallow_pattern(const char *path) {
|
|
return path_startswith(path, "/dev/") ||
|
|
startswith(path, "block-") ||
|
|
startswith(path, "char-");
|
|
}
|
|
|
|
int systemd_installation_has_version(const char *root, unsigned minimal_version) {
|
|
const char *pattern;
|
|
int r;
|
|
|
|
/* Try to guess if systemd installation is later than the specified version. This
|
|
* is hacky and likely to yield false negatives, particularly if the installation
|
|
* is non-standard. False positives should be relatively rare.
|
|
*/
|
|
|
|
NULSTR_FOREACH(pattern,
|
|
/* /lib works for systems without usr-merge, and for systems with a sane
|
|
* usr-merge, where /lib is a symlink to /usr/lib. /usr/lib is necessary
|
|
* for Gentoo which does a merge without making /lib a symlink.
|
|
*/
|
|
"lib/systemd/libsystemd-shared-*.so\0"
|
|
"lib64/systemd/libsystemd-shared-*.so\0"
|
|
"usr/lib/systemd/libsystemd-shared-*.so\0"
|
|
"usr/lib64/systemd/libsystemd-shared-*.so\0") {
|
|
|
|
_cleanup_strv_free_ char **names = NULL;
|
|
_cleanup_free_ char *path = NULL;
|
|
char *c, **name;
|
|
|
|
path = prefix_root(root, pattern);
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
r = glob_extend(&names, path);
|
|
if (r == -ENOENT)
|
|
continue;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
assert_se((c = endswith(path, "*.so")));
|
|
*c = '\0'; /* truncate the glob part */
|
|
|
|
STRV_FOREACH(name, names) {
|
|
/* This is most likely to run only once, hence let's not optimize anything. */
|
|
char *t, *t2;
|
|
unsigned version;
|
|
|
|
t = startswith(*name, path);
|
|
if (!t)
|
|
continue;
|
|
|
|
t2 = endswith(t, ".so");
|
|
if (!t2)
|
|
continue;
|
|
|
|
t2[0] = '\0'; /* truncate the suffix */
|
|
|
|
r = safe_atou(t, &version);
|
|
if (r < 0) {
|
|
log_debug_errno(r, "Found libsystemd shared at \"%s.so\", but failed to parse version: %m", *name);
|
|
continue;
|
|
}
|
|
|
|
log_debug("Found libsystemd shared at \"%s.so\", version %u (%s).",
|
|
*name, version,
|
|
version >= minimal_version ? "OK" : "too old");
|
|
if (version >= minimal_version)
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool dot_or_dot_dot(const char *path) {
|
|
if (!path)
|
|
return false;
|
|
if (path[0] != '.')
|
|
return false;
|
|
if (path[1] == 0)
|
|
return true;
|
|
if (path[1] != '.')
|
|
return false;
|
|
|
|
return path[2] == 0;
|
|
}
|