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-rw-r--r--src/basic/conf-files.c320
1 files changed, 320 insertions, 0 deletions
diff --git a/src/basic/conf-files.c b/src/basic/conf-files.c
new file mode 100644
index 0000000..532c9d1
--- /dev/null
+++ b/src/basic/conf-files.c
@@ -0,0 +1,320 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "chase-symlinks.h"
+#include "conf-files.h"
+#include "def.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "hashmap.h"
+#include "log.h"
+#include "macro.h"
+#include "path-util.h"
+#include "set.h"
+#include "sort-util.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+
+static int files_add(
+ Hashmap *h,
+ Set *masked,
+ const char *suffix,
+ const char *root,
+ unsigned flags,
+ const char *path) {
+
+ _cleanup_free_ char *dirpath = NULL;
+ _cleanup_closedir_ DIR *dir = NULL;
+ int r;
+
+ assert(h);
+ assert((flags & CONF_FILES_FILTER_MASKED) == 0 || masked);
+ assert(path);
+
+ r = chase_symlinks_and_opendir(path, root, CHASE_PREFIX_ROOT, &dirpath, &dir);
+ if (r == -ENOENT)
+ return 0;
+ if (r < 0)
+ return log_debug_errno(r, "Failed to open directory '%s/%s': %m", empty_or_root(root) ? "" : root, dirpath);
+
+ FOREACH_DIRENT(de, dir, return -errno) {
+ struct stat st;
+ char *p, *key;
+
+ /* Does this match the suffix? */
+ if (suffix && !endswith(de->d_name, suffix))
+ continue;
+
+ /* Has this file already been found in an earlier directory? */
+ if (hashmap_contains(h, de->d_name)) {
+ log_debug("Skipping overridden file '%s/%s'.", dirpath, de->d_name);
+ continue;
+ }
+
+ /* Has this been masked in an earlier directory? */
+ if ((flags & CONF_FILES_FILTER_MASKED) && set_contains(masked, de->d_name)) {
+ log_debug("File '%s/%s' is masked by previous entry.", dirpath, de->d_name);
+ continue;
+ }
+
+ /* Read file metadata if we shall validate the check for file masks, for node types or whether the node is marked executable. */
+ if (flags & (CONF_FILES_FILTER_MASKED|CONF_FILES_REGULAR|CONF_FILES_DIRECTORY|CONF_FILES_EXECUTABLE))
+ 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;
+ }
+
+ /* Is this a masking entry? */
+ if ((flags & CONF_FILES_FILTER_MASKED))
+ if (null_or_empty(&st)) {
+ assert(masked);
+
+ /* Mark this one as masked */
+ r = set_put_strdup(&masked, de->d_name);
+ if (r < 0)
+ return r;
+
+ log_debug("File '%s/%s' is a mask.", dirpath, de->d_name);
+ continue;
+ }
+
+ /* Does this node have the right type? */
+ if (flags & (CONF_FILES_REGULAR|CONF_FILES_DIRECTORY))
+ if (!((flags & CONF_FILES_DIRECTORY) && S_ISDIR(st.st_mode)) &&
+ !((flags & CONF_FILES_REGULAR) && S_ISREG(st.st_mode))) {
+ log_debug("Ignoring '%s/%s', as it does not have the right type.", dirpath, de->d_name);
+ continue;
+ }
+
+ /* Does this node have the executable bit set? */
+ if (flags & CONF_FILES_EXECUTABLE)
+ /* As requested: check if the file is marked executable. 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 so, such errors are stuff we should log about. */
+
+ if ((st.st_mode & 0111) == 0) { /* not executable */
+ log_debug("Ignoring '%s/%s', as it is not marked executable.", dirpath, de->d_name);
+ continue;
+ }
+
+ if (flags & CONF_FILES_BASENAME) {
+ p = strdup(de->d_name);
+ if (!p)
+ return -ENOMEM;
+
+ key = p;
+ } else {
+ p = path_join(dirpath, de->d_name);
+ if (!p)
+ return -ENOMEM;
+
+ key = basename(p);
+ }
+
+ r = hashmap_put(h, key, p);
+ if (r < 0) {
+ free(p);
+ return log_debug_errno(r, "Failed to add item to hashmap: %m");
+ }
+
+ assert(r > 0);
+ }
+
+ return 0;
+}
+
+static int base_cmp(char * const *a, char * const *b) {
+ return strcmp(basename(*a), basename(*b));
+}
+
+static int conf_files_list_strv_internal(
+ char ***ret,
+ const char *suffix,
+ const char *root,
+ unsigned flags,
+ char **dirs) {
+
+ _cleanup_hashmap_free_ Hashmap *fh = NULL;
+ _cleanup_set_free_free_ Set *masked = NULL;
+ char **files;
+ int r;
+
+ assert(ret);
+
+ /* This alters the dirs string array */
+ if (!path_strv_resolve_uniq(dirs, root))
+ return -ENOMEM;
+
+ fh = hashmap_new(&path_hash_ops);
+ if (!fh)
+ return -ENOMEM;
+
+ if (flags & CONF_FILES_FILTER_MASKED) {
+ masked = set_new(&path_hash_ops);
+ if (!masked)
+ return -ENOMEM;
+ }
+
+ STRV_FOREACH(p, dirs) {
+ r = files_add(fh, masked, 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;
+
+ typesafe_qsort(files, hashmap_size(fh), base_cmp);
+ *ret = files;
+
+ return 0;
+}
+
+int conf_files_insert(char ***strv, const char *root, 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.
+ */
+ size_t i, n;
+ char *t;
+ int r;
+
+ n = strv_length(*strv);
+ for (i = 0; i < n; i++) {
+ int c;
+
+ c = base_cmp((char* const*) *strv + i, (char* const*) &path);
+ if (c == 0)
+ /* Oh, there already is an entry with a matching name (the last component). */
+ STRV_FOREACH(dir, dirs) {
+ _cleanup_free_ char *rdir = NULL;
+ char *p1, *p2;
+
+ rdir = path_join(root, *dir);
+ if (!rdir)
+ return -ENOMEM;
+
+ p1 = path_startswith((*strv)[i], rdir);
+ 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);
+ 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 */
+ }
+
+ /* The new file has lower priority than all the existing entries */
+ t = path_join(root, path);
+ if (!t)
+ return -ENOMEM;
+
+ r = strv_insert(strv, i, t);
+ if (r < 0)
+ free(t);
+
+ return r;
+}
+
+int conf_files_list_strv(char ***ret, const char *suffix, const char *root, unsigned flags, const char* const* dirs) {
+ _cleanup_strv_free_ char **copy = NULL;
+
+ assert(ret);
+
+ copy = strv_copy((char**) dirs);
+ if (!copy)
+ return -ENOMEM;
+
+ return conf_files_list_strv_internal(ret, suffix, root, flags, copy);
+}
+
+int conf_files_list(char ***ret, const char *suffix, const char *root, unsigned flags, const char *dir) {
+ _cleanup_strv_free_ char **dirs = NULL;
+
+ assert(ret);
+
+ dirs = strv_new(dir);
+ if (!dirs)
+ return -ENOMEM;
+
+ return conf_files_list_strv_internal(ret, suffix, root, flags, dirs);
+}
+
+int conf_files_list_nulstr(char ***ret, const char *suffix, const char *root, unsigned flags, const char *dirs) {
+ _cleanup_strv_free_ char **d = NULL;
+
+ assert(ret);
+
+ d = strv_split_nulstr(dirs);
+ if (!d)
+ return -ENOMEM;
+
+ return conf_files_list_strv_internal(ret, suffix, root, flags, d);
+}
+
+int conf_files_list_with_replacement(
+ const char *root,
+ char **config_dirs,
+ const char *replacement,
+ char ***ret_files,
+ char **ret_replace_file) {
+
+ _cleanup_strv_free_ char **f = NULL;
+ _cleanup_free_ char *p = NULL;
+ int r;
+
+ assert(config_dirs);
+ assert(ret_files);
+ assert(ret_replace_file || !replacement);
+
+ r = conf_files_list_strv(&f, ".conf", root, 0, (const char* const*) config_dirs);
+ if (r < 0)
+ return log_error_errno(r, "Failed to enumerate config files: %m");
+
+ if (replacement) {
+ r = conf_files_insert(&f, root, config_dirs, replacement);
+ if (r < 0)
+ return log_error_errno(r, "Failed to extend config file list: %m");
+
+ p = path_join(root, replacement);
+ if (!p)
+ return log_oom();
+ }
+
+ *ret_files = TAKE_PTR(f);
+ if (ret_replace_file)
+ *ret_replace_file = TAKE_PTR(p);
+
+ return 0;
+}
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