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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <dirent.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "conf-files.h"
#include "dirent-util.h"
#include "fd-util.h"
#include "hashmap.h"
#include "log.h"
#include "macro.h"
#include "missing.h"
#include "path-util.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
#include "util.h"
static int files_add(Hashmap *h, const char *suffix, const char *root, unsigned flags, const char *path) {
_cleanup_closedir_ DIR *dir = NULL;
const char *dirpath;
struct dirent *de;
int r;
assert(path);
dirpath = prefix_roota(root, path);
dir = opendir(dirpath);
if (!dir) {
if (errno == ENOENT)
return 0;
return -errno;
}
FOREACH_DIRENT(de, dir, return -errno) {
char *p;
if (!dirent_is_file_with_suffix(de, suffix)) {
log_debug("Ignoring %s/%s, because it's not a regular file with suffix %s.", dirpath, de->d_name, strna(suffix));
continue;
}
if (flags & CONF_FILES_EXECUTABLE) {
struct stat st;
/* As requested: check if the file is marked exectuable. Note that we don't check access(X_OK)
* here, as we care about whether the file is marked executable at all, and not whether it is
* executable for us, because if such errors are stuff we should log about. */
if (fstatat(dirfd(dir), de->d_name, &st, 0) < 0) {
log_debug_errno(errno, "Failed to stat %s/%s, ignoring: %m", dirpath, de->d_name);
continue;
}
if (!null_or_empty(&st)) {
/* A mask is a symlink to /dev/null or an empty file. It does not even
* have to be executable. Other entries must be regular executable files
* or symlinks to them. */
if (S_ISREG(st.st_mode)) {
if ((st.st_mode & 0111) == 0) { /* not executable */
log_debug("Ignoring %s/%s, as it is not marked executable.",
dirpath, de->d_name);
continue;
}
} else {
log_debug("Ignoring %s/%s, as it is neither a regular file nor a mask.",
dirpath, de->d_name);
continue;
}
}
}
p = strjoin(dirpath, "/", de->d_name);
if (!p)
return -ENOMEM;
r = hashmap_put(h, basename(p), p);
if (r == -EEXIST) {
log_debug("Skipping overridden file: %s.", p);
free(p);
} else if (r < 0) {
free(p);
return r;
} else if (r == 0) {
log_debug("Duplicate file %s", p);
free(p);
}
}
return 0;
}
static int base_cmp(const void *a, const void *b) {
const char *s1, *s2;
s1 = *(char * const *)a;
s2 = *(char * const *)b;
return strcmp(basename(s1), basename(s2));
}
static int conf_files_list_strv_internal(char ***strv, const char *suffix, const char *root, unsigned flags, char **dirs) {
_cleanup_hashmap_free_ Hashmap *fh = NULL;
char **files, **p;
int r;
assert(strv);
/* This alters the dirs string array */
if (!path_strv_resolve_uniq(dirs, root))
return -ENOMEM;
fh = hashmap_new(&string_hash_ops);
if (!fh)
return -ENOMEM;
STRV_FOREACH(p, dirs) {
r = files_add(fh, suffix, root, flags, *p);
if (r == -ENOMEM)
return r;
if (r < 0)
log_debug_errno(r, "Failed to search for files in %s, ignoring: %m", *p);
}
files = hashmap_get_strv(fh);
if (!files)
return -ENOMEM;
qsort_safe(files, hashmap_size(fh), sizeof(char *), base_cmp);
*strv = files;
return 0;
}
int conf_files_insert(char ***strv, const char *root, const char *dirs, const char *path) {
/* Insert a path into strv, at the place honouring the usual sorting rules:
* - we first compare by the basename
* - and then we compare by dirname, allowing just one file with the given
* basename.
* This means that we will
* - add a new entry if basename(path) was not on the list,
* - do nothing if an entry with higher priority was already present,
* - do nothing if our new entry matches the existing entry,
* - replace the existing entry if our new entry has higher priority.
*/
char *t;
unsigned i;
int r;
for (i = 0; i < strv_length(*strv); i++) {
int c;
c = base_cmp(*strv + i, &path);
if (c == 0) {
const char *dir;
/* Oh, we found our spot and it already contains something. */
NULSTR_FOREACH(dir, dirs) {
char *p1, *p2;
p1 = path_startswith((*strv)[i], root);
if (p1)
/* Skip "/" in dir, because p1 is without "/" too */
p1 = path_startswith(p1, dir + 1);
if (p1)
/* Existing entry with higher priority
* or same priority, no need to do anything. */
return 0;
p2 = path_startswith(path, dir);
if (p2) {
/* Our new entry has higher priority */
t = path_join(root, path, NULL);
if (!t)
return log_oom();
return free_and_replace((*strv)[i], t);
}
}
} else if (c > 0)
/* Following files have lower priority, let's go insert our
* new entry. */
break;
/* … we are not there yet, let's continue */
}
t = path_join(root, path, NULL);
if (!t)
return log_oom();
r = strv_insert(strv, i, t);
if (r < 0)
free(t);
return r;
}
int conf_files_list_strv(char ***strv, const char *suffix, const char *root, unsigned flags, const char* const* dirs) {
_cleanup_strv_free_ char **copy = NULL;
assert(strv);
copy = strv_copy((char**) dirs);
if (!copy)
return -ENOMEM;
return conf_files_list_strv_internal(strv, suffix, root, flags, copy);
}
int conf_files_list(char ***strv, const char *suffix, const char *root, unsigned flags, const char *dir, ...) {
_cleanup_strv_free_ char **dirs = NULL;
va_list ap;
assert(strv);
va_start(ap, dir);
dirs = strv_new_ap(dir, ap);
va_end(ap);
if (!dirs)
return -ENOMEM;
return conf_files_list_strv_internal(strv, suffix, root, flags, dirs);
}
int conf_files_list_nulstr(char ***strv, const char *suffix, const char *root, unsigned flags, const char *d) {
_cleanup_strv_free_ char **dirs = NULL;
assert(strv);
dirs = strv_split_nulstr(d);
if (!dirs)
return -ENOMEM;
return conf_files_list_strv_internal(strv, suffix, root, flags, dirs);
}
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