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/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <stdbool.h>
#include <string.h>
#include <sys/stat.h>
#include "alloc-util.h"
#include "fs-util.h"
#include "macro.h"
#include "mkdir.h"
#include "path-util.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "user-util.h"
int mkdir_safe_internal(const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdir_func_t _mkdir) {
struct stat st;
int r;
assert(_mkdir != mkdir);
if (_mkdir(path, mode) >= 0) {
r = chmod_and_chown(path, mode, uid, gid);
if (r < 0)
return r;
}
if (lstat(path, &st) < 0)
return -errno;
if ((flags & MKDIR_FOLLOW_SYMLINK) && S_ISLNK(st.st_mode)) {
_cleanup_free_ char *p = NULL;
r = chase_symlinks(path, NULL, CHASE_NONEXISTENT, &p);
if (r < 0)
return r;
if (r == 0)
return mkdir_safe_internal(p, mode, uid, gid,
flags & ~MKDIR_FOLLOW_SYMLINK,
_mkdir);
if (lstat(p, &st) < 0)
return -errno;
}
if (!S_ISDIR(st.st_mode)) {
log_full(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG,
"Path \"%s\" already exists and is not a directory, refusing.", path);
return -ENOTDIR;
}
if ((st.st_mode & 0007) > (mode & 0007) ||
(st.st_mode & 0070) > (mode & 0070) ||
(st.st_mode & 0700) > (mode & 0700)) {
log_full(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG,
"Directory \"%s\" already exists, but has mode %04o that is too permissive (%04o was requested), refusing.",
path, st.st_mode & 0777, mode);
return -EEXIST;
}
if ((uid != UID_INVALID && st.st_uid != uid) ||
(gid != GID_INVALID && st.st_gid != gid)) {
char u[DECIMAL_STR_MAX(uid_t)] = "-", g[DECIMAL_STR_MAX(gid_t)] = "-";
if (uid != UID_INVALID)
xsprintf(u, UID_FMT, uid);
if (gid != UID_INVALID)
xsprintf(g, GID_FMT, gid);
log_full(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG,
"Directory \"%s\" already exists, but is owned by "UID_FMT":"GID_FMT" (%s:%s was requested), refusing.",
path, st.st_uid, st.st_gid, u, g);
return -EEXIST;
}
return 0;
}
int mkdir_errno_wrapper(const char *pathname, mode_t mode) {
if (mkdir(pathname, mode) < 0)
return -errno;
return 0;
}
int mkdirat_errno_wrapper(int dirfd, const char *pathname, mode_t mode) {
if (mkdirat(dirfd, pathname, mode) < 0)
return -errno;
return 0;
}
int mkdir_safe(const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {
return mkdir_safe_internal(path, mode, uid, gid, flags, mkdir_errno_wrapper);
}
int mkdir_parents_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
const char *p, *e;
int r;
assert(path);
assert(_mkdir != mkdir);
if (prefix && !path_startswith(path, prefix))
return -ENOTDIR;
/* return immediately if directory exists */
e = strrchr(path, '/');
if (!e)
return -EINVAL;
if (e == path)
return 0;
p = strndupa(path, e - path);
r = is_dir(p, true);
if (r > 0)
return 0;
if (r == 0)
return -ENOTDIR;
/* create every parent directory in the path, except the last component */
p = path + strspn(path, "/");
for (;;) {
char t[strlen(path) + 1];
e = p + strcspn(p, "/");
p = e + strspn(e, "/");
/* Is this the last component? If so, then we're done */
if (*p == 0)
return 0;
memcpy(t, path, e - path);
t[e-path] = 0;
if (prefix && path_startswith(prefix, t))
continue;
r = _mkdir(t, mode);
if (r < 0 && r != -EEXIST)
return r;
}
}
int mkdir_parents(const char *path, mode_t mode) {
return mkdir_parents_internal(NULL, path, mode, mkdir_errno_wrapper);
}
int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
int r;
/* Like mkdir -p */
assert(_mkdir != mkdir);
r = mkdir_parents_internal(prefix, path, mode, _mkdir);
if (r < 0)
return r;
r = _mkdir(path, mode);
if (r < 0 && (r != -EEXIST || is_dir(path, true) <= 0))
return r;
return 0;
}
int mkdir_p(const char *path, mode_t mode) {
return mkdir_p_internal(NULL, path, mode, mkdir_errno_wrapper);
}
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