#include <stdlib.h>
#include <signal.h>
#include <libintl.h>
+#include <locale.h>
#include <stdio.h>
#include <syslog.h>
#include <sched.h>
return (char*) s + sl - pl;
}
-char* endswith_no_case(const char *s, const char *postfix) {
- size_t sl, pl;
-
- assert(s);
- assert(postfix);
-
- sl = strlen(s);
- pl = strlen(postfix);
-
- if (pl == 0)
- return (char*) s + sl;
-
- if (sl < pl)
- return NULL;
-
- if (strcasecmp(s + sl - pl, postfix) != 0)
- return NULL;
-
- return (char*) s + sl - pl;
-}
-
char* first_word(const char *s, const char *word) {
size_t sl, wl;
const char *p;
return r;
}
-int cunescape_length_with_prefix(const char *s, size_t length, const char *prefix, UnescapeFlags flags, char **ret) {
+char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix) {
char *r, *t;
const char *f;
size_t pl;
assert(s);
- assert(ret);
/* Undoes C style string escaping, and optionally prefixes it. */
r = new(char, pl+length+1);
if (!r)
- return -ENOMEM;
+ return NULL;
if (prefix)
memcpy(r, prefix, pl);
remaining = s + length - f;
assert(remaining > 0);
- if (*f != '\\') {
- /* A literal literal, copy verbatim */
+ if (*f != '\\' || remaining == 1) {
+ /* a literal literal, or a trailing backslash, copy verbatim */
*(t++) = *f;
continue;
}
- if (remaining == 1) {
- if (flags & UNESCAPE_RELAX) {
- /* A trailing backslash, copy verbatim */
- *(t++) = *f;
- continue;
- }
-
- return -EINVAL;
- }
-
k = cunescape_one(f + 1, remaining - 1, t);
if (k < 0) {
- if (flags & UNESCAPE_RELAX) {
- /* Invalid escape code, let's take it literal then */
- *(t++) = '\\';
- continue;
- }
-
- return k;
+ /* Invalid escape code, let's take it literal then */
+ *(t++) = '\\';
+ continue;
}
f += k;
}
*t = 0;
-
- *ret = r;
- return t - r;
+ return r;
}
-int cunescape_length(const char *s, size_t length, UnescapeFlags flags, char **ret) {
- return cunescape_length_with_prefix(s, length, NULL, flags, ret);
+char *cunescape_length(const char *s, size_t length) {
+ return cunescape_length_with_prefix(s, length, NULL);
}
-int cunescape(const char *s, UnescapeFlags flags, char **ret) {
- return cunescape_length(s, strlen(s), flags, ret);
+char *cunescape(const char *s) {
+ assert(s);
+
+ return cunescape_length(s, strlen(s));
}
char *xescape(const char *s, const char *bad) {
return 0;
}
-bool is_temporary_fs(const struct statfs *s) {
+int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
+ _cleanup_closedir_ DIR *d = NULL;
+ int ret = 0;
+
+ assert(fd >= 0);
+
+ /* This returns the first error we run into, but nevertheless
+ * tries to go on. This closes the passed fd. */
+
+ d = fdopendir(fd);
+ if (!d) {
+ safe_close(fd);
+
+ return errno == ENOENT ? 0 : -errno;
+ }
+
+ for (;;) {
+ struct dirent *de;
+ bool is_dir, keep_around;
+ struct stat st;
+ int r;
+
+ errno = 0;
+ de = readdir(d);
+ if (!de) {
+ if (errno != 0 && ret == 0)
+ ret = -errno;
+ return ret;
+ }
+
+ if (streq(de->d_name, ".") || streq(de->d_name, ".."))
+ continue;
+
+ if (de->d_type == DT_UNKNOWN ||
+ honour_sticky ||
+ (de->d_type == DT_DIR && root_dev)) {
+ if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
+ if (ret == 0 && errno != ENOENT)
+ ret = -errno;
+ continue;
+ }
+
+ is_dir = S_ISDIR(st.st_mode);
+ keep_around =
+ honour_sticky &&
+ (st.st_uid == 0 || st.st_uid == getuid()) &&
+ (st.st_mode & S_ISVTX);
+ } else {
+ is_dir = de->d_type == DT_DIR;
+ keep_around = false;
+ }
+
+ if (is_dir) {
+ int subdir_fd;
+
+ /* if root_dev is set, remove subdirectories only, if device is same as dir */
+ if (root_dev && st.st_dev != root_dev->st_dev)
+ continue;
+
+ subdir_fd = openat(fd, de->d_name,
+ O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
+ if (subdir_fd < 0) {
+ if (ret == 0 && errno != ENOENT)
+ ret = -errno;
+ continue;
+ }
+
+ r = rm_rf_children_dangerous(subdir_fd, only_dirs, honour_sticky, root_dev);
+ if (r < 0 && ret == 0)
+ ret = r;
+
+ if (!keep_around)
+ if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
+ if (ret == 0 && errno != ENOENT)
+ ret = -errno;
+ }
+
+ } else if (!only_dirs && !keep_around) {
+
+ if (unlinkat(fd, de->d_name, 0) < 0) {
+ if (ret == 0 && errno != ENOENT)
+ ret = -errno;
+ }
+ }
+ }
+}
+
+_pure_ static int is_temporary_fs(struct statfs *s) {
assert(s);
return F_TYPE_EQUAL(s->f_type, TMPFS_MAGIC) ||
F_TYPE_EQUAL(s->f_type, RAMFS_MAGIC);
}
-int fd_is_temporary_fs(int fd) {
+int is_fd_on_temporary_fs(int fd) {
struct statfs s;
if (fstatfs(fd, &s) < 0)
return is_temporary_fs(&s);
}
+int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
+ struct statfs s;
+
+ assert(fd >= 0);
+
+ if (fstatfs(fd, &s) < 0) {
+ safe_close(fd);
+ return -errno;
+ }
+
+ /* We refuse to clean disk file systems with this call. This
+ * is extra paranoia just to be sure we never ever remove
+ * non-state data */
+ if (!is_temporary_fs(&s)) {
+ log_error("Attempted to remove disk file system, and we can't allow that.");
+ safe_close(fd);
+ return -EPERM;
+ }
+
+ return rm_rf_children_dangerous(fd, only_dirs, honour_sticky, root_dev);
+}
+
+static int file_is_priv_sticky(const char *p) {
+ struct stat st;
+
+ assert(p);
+
+ if (lstat(p, &st) < 0)
+ return -errno;
+
+ return
+ (st.st_uid == 0 || st.st_uid == getuid()) &&
+ (st.st_mode & S_ISVTX);
+}
+
+static int rm_rf_internal(const char *path, bool only_dirs, bool delete_root, bool honour_sticky, bool dangerous) {
+ int fd, r;
+ struct statfs s;
+
+ assert(path);
+
+ /* We refuse to clean the root file system with this
+ * call. This is extra paranoia to never cause a really
+ * seriously broken system. */
+ if (path_equal(path, "/")) {
+ log_error("Attempted to remove entire root file system, and we can't allow that.");
+ return -EPERM;
+ }
+
+ fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
+ if (fd < 0) {
+
+ if (errno != ENOTDIR && errno != ELOOP)
+ return -errno;
+
+ if (!dangerous) {
+ if (statfs(path, &s) < 0)
+ return -errno;
+
+ if (!is_temporary_fs(&s)) {
+ log_error("Attempted to remove disk file system, and we can't allow that.");
+ return -EPERM;
+ }
+ }
+
+ if (delete_root && !only_dirs)
+ if (unlink(path) < 0 && errno != ENOENT)
+ return -errno;
+
+ return 0;
+ }
+
+ if (!dangerous) {
+ if (fstatfs(fd, &s) < 0) {
+ safe_close(fd);
+ return -errno;
+ }
+
+ if (!is_temporary_fs(&s)) {
+ log_error("Attempted to remove disk file system, and we can't allow that.");
+ safe_close(fd);
+ return -EPERM;
+ }
+ }
+
+ r = rm_rf_children_dangerous(fd, only_dirs, honour_sticky, NULL);
+ if (delete_root) {
+
+ if (honour_sticky && file_is_priv_sticky(path) > 0)
+ return r;
+
+ if (rmdir(path) < 0 && errno != ENOENT) {
+ if (r == 0)
+ r = -errno;
+ }
+ }
+
+ return r;
+}
+
+int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
+ return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, false);
+}
+
+int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
+ return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, true);
+}
+
int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
assert(path);
continue;
}
- r = cunescape(path, UNESCAPE_RELAX, &p);
- if (r < 0)
- return r;
+ p = cunescape(path);
+ if (!p)
+ return -ENOMEM;
if (!path_startswith(p, prefix))
continue;
continue;
}
- r = cunescape(path, UNESCAPE_RELAX, &p);
- if (r < 0)
- return r;
+ p = cunescape(path);
+ if (!p)
+ return -ENOMEM;
/* Let's ignore autofs mounts. If they aren't
* triggered yet, we want to avoid triggering
~ianmdlvl / elogind.git / blobdiff