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chase-symlinks: add chase_symlinks_and_access() helper

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This is similar to chase_symlinks_and_access() but wraps access() rather
than stat()
This commit is contained in:
Lennart Poettering
2022-08-22 11:36:12 +02:00
parent 37b9bc56fc
commit 2b2caea21d
2 changed files with 44 additions and 1 deletions
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43
src/basic/chase-symlinks.c
View File

@@ -530,6 +530,49 @@ int chase_symlinks_and_stat(
return 1;
}
int chase_symlinks_and_access(
const char *path,
const char *root,
ChaseSymlinksFlags chase_flags,
int access_mode,
char **ret_path,
int *ret_fd) {
_cleanup_close_ int path_fd = -1;
_cleanup_free_ char *p = NULL;
int r;
assert(path);
if (chase_flags & (CHASE_NONEXISTENT|CHASE_STEP))
return -EINVAL;
if (empty_or_root(root) && !ret_path && (chase_flags & (CHASE_NO_AUTOFS|CHASE_SAFE)) == 0 && !ret_fd) {
/* Shortcut this call if none of the special features of this call are requested */
if (faccessat(AT_FDCWD, path, access_mode, FLAGS_SET(chase_flags, CHASE_NOFOLLOW) ? AT_SYMLINK_NOFOLLOW : 0) < 0)
return -errno;
return 1;
}
r = chase_symlinks(path, root, chase_flags, ret_path ? &p : NULL, &path_fd);
if (r < 0)
return r;
assert(path_fd >= 0);
r = access_fd(path_fd, access_mode);
if (r < 0)
return r;
if (ret_path)
*ret_path = TAKE_PTR(p);
if (ret_fd)
*ret_fd = TAKE_FD(path_fd);
return 1;
}
int chase_symlinks_and_fopen_unlocked(
const char *path,
const char *root,

2
src/basic/chase-symlinks.h
View File

@@ -28,5 +28,5 @@ int chase_symlinks(const char *path_with_prefix, const char *root, ChaseSymlinks
int chase_symlinks_and_open(const char *path, const char *root, ChaseSymlinksFlags chase_flags, int open_flags, char **ret_path);
int chase_symlinks_and_opendir(const char *path, const char *root, ChaseSymlinksFlags chase_flags, char **ret_path, DIR **ret_dir);
int chase_symlinks_and_stat(const char *path, const char *root, ChaseSymlinksFlags chase_flags, char **ret_path, struct stat *ret_stat, int *ret_fd);
int chase_symlinks_and_access(const char *path, const char *root, ChaseSymlinksFlags chase_flags, int access_mode, char **ret_path, int *ret_fd);
int chase_symlinks_and_fopen_unlocked(const char *path, const char *root, ChaseSymlinksFlags chase_flags, const char *open_flags, char **ret_path, FILE **ret_file);