#include <unistd.h>

#include <fcntl.h>

#include <errno.h>

#include <string.h>

#include <limits.h>

#include <dirent.h>

#include <grp.h>

#include <pwd.h>

#include <stdio.h>

#include <stdlib.h>

#include <stddef.h>

#include <getopt.h>

#include <stdbool.h>

#include <time.h>

#include <glob.h>

#include <fnmatch.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <sys/param.h>

#include <sys/xattr.h>

#include "log.h"

#include "util.h"

#include "macro.h"

#include "missing.h"

#include "mkdir.h"

#include "path-util.h"

#include "strv.h"

#include "label.h"

#include "set.h"

#include "conf-files.h"

#include "capability.h"

#include "specifier.h"

#include "build.h"

#include "copy.h"

#include "selinux-util.h"

#include "btrfs-util.h"

typedef enum ItemType {

/* These ones take file names */

CREATE_FILE = 'f',

TRUNCATE_FILE = 'F',

CREATE_DIRECTORY = 'd',

TRUNCATE_DIRECTORY = 'D',

CREATE_SUBVOLUME = 'v',

CREATE_FIFO = 'p',

CREATE_SYMLINK = 'L',

CREATE_CHAR_DEVICE = 'c',

CREATE_BLOCK_DEVICE = 'b',

COPY_FILES = 'C',

SET_XATTR = 't',

/* These ones take globs */

WRITE_FILE = 'w',

IGNORE_PATH = 'x',

IGNORE_DIRECTORY_PATH = 'X',

REMOVE_PATH = 'r',

RECURSIVE_REMOVE_PATH = 'R',

ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */

RELABEL_PATH = 'z',

RECURSIVE_RELABEL_PATH = 'Z',

} ItemType;

typedef struct Item {

ItemType type;

char *path;

char *argument;

char **xattrs;

uid_t uid;

gid_t gid;

mode_t mode;

usec_t age;

dev_t major_minor;

bool uid_set:1;

bool gid_set:1;

bool mode_set:1;

bool age_set:1;

bool mask_perms:1;

bool keep_first_level:1;

bool force:1;

bool done:1;

} Item;

static bool arg_create = false;

static bool arg_clean = false;

static bool arg_remove = false;

static bool arg_boot = false;

static char **arg_include_prefixes = NULL;

static char **arg_exclude_prefixes = NULL;

static char *arg_root = NULL;

static const char conf_file_dirs[] = CONF_DIRS_NULSTR("tmpfiles");

#define MAX_DEPTH 256

static Hashmap *items = NULL, *globs = NULL;

static Set *unix_sockets = NULL;

static bool needs_glob(ItemType t) {

return IN_SET(t,

WRITE_FILE,

IGNORE_PATH,

IGNORE_DIRECTORY_PATH,

REMOVE_PATH,

RECURSIVE_REMOVE_PATH,

ADJUST_MODE,

RELABEL_PATH,

RECURSIVE_RELABEL_PATH);

}

static struct Item* find_glob(Hashmap *h, const char *match) {

Item *j;

Iterator i;

HASHMAP_FOREACH(j, h, i)

if (fnmatch(j->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)

return j;

return NULL;

}

static void load_unix_sockets(void) {

_cleanup_fclose_ FILE *f = NULL;

char line[LINE_MAX];

if (unix_sockets)

return;

/* We maintain a cache of the sockets we found in

unix_sockets = set_new(&string_hash_ops);

if (!unix_sockets)

return;

f = fopen("/proc/net/unix", "re");

if (!f)

return;

/* Skip header */

if (!fgets(line, sizeof(line), f))

goto fail;

for (;;) {

char *p, *s;

int k;

if (!fgets(line, sizeof(line), f))

break;

truncate_nl(line);

p = strchr(line, ':');

if (!p)

continue;

if (strlen(p) < 37)

continue;

p += 37;

p += strspn(p, WHITESPACE);

p += strcspn(p, WHITESPACE); /* skip one more word */

p += strspn(p, WHITESPACE);

if (*p != '/')

continue;

s = strdup(p);

if (!s)

goto fail;

path_kill_slashes(s);

k = set_consume(unix_sockets, s);

if (k < 0 && k != -EEXIST)

goto fail;

}

return;

fail:

set_free_free(unix_sockets);

unix_sockets = NULL;

}

static bool unix_socket_alive(const char *fn) {

assert(fn);

load_unix_sockets();

if (unix_sockets)

return !!set_get(unix_sockets, (char*) fn);

/* We don't know, so assume yes */

return true;

}

static int dir_is_mount_point(DIR *d, const char *subdir) {

union file_handle_union h = FILE_HANDLE_INIT;

int mount_id_parent, mount_id;

int r_p, r;

r_p = name_to_handle_at(dirfd(d), ".", &h.handle, &mount_id_parent, 0);

if (r_p < 0)

r_p = -errno;

h.handle.handle_bytes = MAX_HANDLE_SZ;

r = name_to_handle_at(dirfd(d), subdir, &h.handle, &mount_id, 0);

if (r < 0)

r = -errno;

/* got no handle; make no assumptions, return error */

if (r_p < 0 && r < 0)

return r_p;

/* got both handles; if they differ, it is a mount point */

if (r_p >= 0 && r >= 0)

return mount_id_parent != mount_id;

/* got only one handle; assume different mount points if one

if (r_p == -ENOSYS || r_p == -EOPNOTSUPP || r == -ENOSYS || r == -EOPNOTSUPP)

return true;

/* return error */

if (r_p < 0)

return r_p;

return r;

}

static int dir_cleanup(

Item *i,

const char *p,

DIR *d,

const struct stat *ds,

usec_t cutoff,

dev_t rootdev,

bool mountpoint,

int maxdepth,

bool keep_this_level) {

struct dirent *dent;

struct timespec times[2];

bool deleted = false;

int r = 0;

while ((dent = readdir(d))) {

struct stat s;

usec_t age;

_cleanup_free_ char *sub_path = NULL;

if (streq(dent->d_name, ".") ||

streq(dent->d_name, ".."))

continue;

if (fstatat(dirfd(d), dent->d_name, &s, AT_SYMLINK_NOFOLLOW) < 0) {

if (errno == ENOENT)

continue;

/* FUSE, NFS mounts, SELinux might return EACCES */

if (errno == EACCES)

log_debug_errno(errno, "stat(%s/%s) failed: %m", p, dent->d_name);

else

log_error_errno(errno, "stat(%s/%s) failed: %m", p, dent->d_name);

r = -errno;

continue;

}

/* Stay on the same filesystem */

if (s.st_dev != rootdev)

continue;

/* Try to detect bind mounts of the same filesystem instance; they

if (S_ISDIR(s.st_mode) && dir_is_mount_point(d, dent->d_name) > 0)

continue;

/* Do not delete read-only files owned by root */

if (s.st_uid == 0 && !(s.st_mode & S_IWUSR))

continue;

sub_path = strjoin(p, "/", dent->d_name, NULL);

if (!sub_path) {

r = log_oom();

goto finish;

}

/* Is there an item configured for this path? */

if (hashmap_get(items, sub_path))

continue;

if (find_glob(globs, sub_path))

continue;

if (S_ISDIR(s.st_mode)) {

if (mountpoint &&

streq(dent->d_name, "lost+found") &&

s.st_uid == 0)

continue;

if (maxdepth <= 0)

log_warning("Reached max depth on %s.", sub_path);

else {

_cleanup_closedir_ DIR *sub_dir;

int q;

sub_dir = xopendirat(dirfd(d), dent->d_name, O_NOFOLLOW|O_NOATIME);

if (!sub_dir) {

if (errno != ENOENT) {

log_error_errno(errno, "opendir(%s/%s) failed: %m", p, dent->d_name);

r = -errno;

}

continue;

}

q = dir_cleanup(i, sub_path, sub_dir, &s, cutoff, rootdev, false, maxdepth-1, false);

if (q < 0)

r = q;

}

/* Note: if you are wondering why we don't

if (keep_this_level)

continue;

/* Ignore ctime, we change it when deleting */

age = MAX(timespec_load(&s.st_mtim),

timespec_load(&s.st_atim));

if (age >= cutoff)

continue;

if (i->type != IGNORE_DIRECTORY_PATH || !streq(dent->d_name, p)) {

log_debug("rmdir '%s'", sub_path);

if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0) {

if (errno != ENOENT && errno != ENOTEMPTY) {

log_error_errno(errno, "rmdir(%s): %m", sub_path);

r = -errno;

}

}

}

} else {

/* Skip files for which the sticky bit is

if (s.st_mode & S_ISVTX)

continue;

if (mountpoint && S_ISREG(s.st_mode)) {

if (streq(dent->d_name, ".journal") &&

s.st_uid == 0)

continue;

if (streq(dent->d_name, "aquota.user") ||

streq(dent->d_name, "aquota.group"))

continue;

}

/* Ignore sockets that are listed in /proc/net/unix */

if (S_ISSOCK(s.st_mode) && unix_socket_alive(sub_path))

continue;

/* Ignore device nodes */

if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode))

continue;

/* Keep files on this level around if this is

if (keep_this_level)

continue;

age = MAX3(timespec_load(&s.st_mtim),

timespec_load(&s.st_atim),

timespec_load(&s.st_ctim));

if (age >= cutoff)

continue;

log_debug("unlink '%s'", sub_path);

if (unlinkat(dirfd(d), dent->d_name, 0) < 0) {

if (errno != ENOENT) {

log_error_errno(errno, "unlink(%s): %m", sub_path);

r = -errno;

}

}

deleted = true;

}

}

finish:

if (deleted) {

/* Restore original directory timestamps */

times[0] = ds->st_atim;

times[1] = ds->st_mtim;

if (futimens(dirfd(d), times) < 0)

log_error_errno(errno, "utimensat(%s): %m", p);

}

return r;

}

static int item_set_perms(Item *i, const char *path) {

struct stat st;

bool st_valid;

assert(i);

assert(path);

st_valid = stat(path, &st) == 0;

/* not using i->path directly because it may be a glob */

if (i->mode_set) {

mode_t m = i->mode;

if (i->mask_perms && st_valid) {

if (!(st.st_mode & 0111))

m &= ~0111;

if (!(st.st_mode & 0222))

m &= ~0222;

if (!(st.st_mode & 0444))

m &= ~0444;

if (!S_ISDIR(st.st_mode))

m &= ~07000; /* remove sticky/sgid/suid bit, unless directory */

}

if (!st_valid || m != (st.st_mode & 07777)) {

if (chmod(path, m) < 0)

return log_error_errno(errno, "chmod(%s) failed: %m", path);

}

}

if ((!st_valid || (i->uid != st.st_uid || i->gid != st.st_gid)) &&

(i->uid_set || i->gid_set))

if (chown(path,

i->uid_set ? i->uid : UID_INVALID,

i->gid_set ? i->gid : GID_INVALID) < 0)

return log_error_errno(errno, "chown(%s) failed: %m", path);

return label_fix(path, false, false);

}

static int get_xattrs_from_arg(Item *i) {

char *xattr;

const char *p;

int r;

assert(i);

assert(i->argument);

p = i->argument;

while ((r = unquote_first_word(&p, &xattr, false)) > 0) {

_cleanup_free_ char *tmp = NULL, *name = NULL,

*value = NULL, *value2 = NULL, *_xattr = xattr;

r = split_pair(xattr, "=", &name, &value);

if (r < 0) {

log_warning("Illegal xattr found: \"%s\" - ignoring.", xattr);

continue;

}

if (strempty(name) || strempty(value)) {

log_warning("Malformed xattr found: \"%s\" - ignoring.", xattr);

continue;

}

tmp = unquote(value, "\"");

if (!tmp)

return log_oom();

value2 = cunescape(tmp);

if (!value2)

return log_oom();

if (strv_push_pair(&i->xattrs, name, value2) < 0)

return log_oom();

name = value2 = NULL;

}

return r;

}

static int item_set_xattrs(Item *i, const char *path) {

char **name, **value;

assert(i);

assert(path);

STRV_FOREACH_PAIR(name, value, i->xattrs) {

int n;

n = strlen(*value);

if (lsetxattr(path, *name, *value, n, 0) < 0) {

log_error("Setting extended attribute %s=%s on %s failed: %m",

*name, *value, path);

return -errno;

}

}

return 0;

}

static int write_one_file(Item *i, const char *path) {

_cleanup_close_ int fd = -1;

int flags, r = 0;

struct stat st;

assert(i);

assert(path);

flags = i->type == CREATE_FILE ? O_CREAT|O_APPEND|O_NOFOLLOW :

i->type == TRUNCATE_FILE ? O_CREAT|O_TRUNC|O_NOFOLLOW : 0;

RUN_WITH_UMASK(0000) {

mac_selinux_create_file_prepare(path, S_IFREG);

fd = open(path, flags|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);

mac_selinux_create_file_clear();

}

if (fd < 0) {

if (i->type == WRITE_FILE && errno == ENOENT)

return 0;

log_error_errno(errno, "Failed to create file %s: %m", path);

return -errno;

}

if (i->argument) {

_cleanup_free_ char *unescaped;

ssize_t n;

size_t l;

unescaped = cunescape(i->argument);

if (!unescaped)

return log_oom();

l = strlen(unescaped);

n = write(fd, unescaped, l);

if (n < 0 || (size_t) n < l) {

log_error("Failed to write file %s: %s", path, n < 0 ? strerror(-n) : "Short write");

return n < 0 ? n : -EIO;

}

}

fd = safe_close(fd);

if (stat(path, &st) < 0)

return log_error_errno(errno, "stat(%s) failed: %m", path);

if (!S_ISREG(st.st_mode)) {

log_error("%s is not a file.", path);

return -EEXIST;

}

r = item_set_perms(i, path);

if (r < 0)

return r;

r = item_set_xattrs(i, i->path);

if (r < 0)

return r;

return 0;

}

static int item_set_perms_children(Item *i, const char *path) {

_cleanup_closedir_ DIR *d;

int r = 0;

assert(i);

assert(path);

/* This returns the first error we run into, but nevertheless

d = opendir(path);

if (!d)

return errno == ENOENT || errno == ENOTDIR ? 0 : -errno;

for (;;) {

_cleanup_free_ char *p = NULL;

struct dirent *de;

int q;

errno = 0;

de = readdir(d);

if (!de) {

if (errno != 0 && r == 0)

r = -errno;

break;

}

if (streq(de->d_name, ".") || streq(de->d_name, ".."))

continue;

p = strjoin(path, "/", de->d_name, NULL);

if (!p)

return -ENOMEM;

q = item_set_perms(i, p);

if (q < 0 && q != -ENOENT && r == 0)

r = q;

if (IN_SET(de->d_type, DT_UNKNOWN, DT_DIR)) {

q = item_set_perms_children(i, p);

if (q < 0 && r == 0)

r = q;

}

}

return r;

}

static int item_set_perms_recursive(Item *i, const char *path) {

int r, q;

assert(i);

assert(path);

r = item_set_perms(i, path);

if (r < 0)

return r;

q = item_set_perms_children(i, path);

if (q < 0 && r == 0)

r = q;

return r;

}

static int glob_item(Item *i, int (*action)(Item *, const char *)) {

_cleanup_globfree_ glob_t g = {};

int r = 0, k;

char **fn;

errno = 0;

k = glob(i->path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);

if (k != 0 && k != GLOB_NOMATCH) {

if (errno == 0)

errno = EIO;

log_error_errno(errno, "glob(%s) failed: %m", i->path);

return -errno;

}

STRV_FOREACH(fn, g.gl_pathv) {

k = action(i, *fn);

if (k < 0 && r == 0)

r = k;

}

return r;

}

static int create_item(Item *i) {

struct stat st;

int r = 0;

assert(i);

switch (i->type) {

case IGNORE_PATH:

case IGNORE_DIRECTORY_PATH:

case REMOVE_PATH:

case RECURSIVE_REMOVE_PATH:

return 0;

case CREATE_FILE:

case TRUNCATE_FILE:

r = write_one_file(i, i->path);

if (r < 0)

return r;

break;

case COPY_FILES:

r = copy_tree(i->argument, i->path, false);

if (r < 0) {

struct stat a, b;

if (r != -EEXIST)

return log_error_errno(r, "Failed to copy files to %s: %m", i->path);

if (stat(i->argument, &a) < 0)

return log_error_errno(errno, "stat(%s) failed: %m", i->argument);

if (stat(i->path, &b) < 0)

return log_error_errno(errno, "stat(%s) failed: %m", i->path);

if ((a.st_mode ^ b.st_mode) & S_IFMT) {

log_debug("Can't copy to %s, file exists already and is of different type", i->path);

return 0;

}

}

r = item_set_perms(i, i->path);

if (r < 0)

return r;

break;

case WRITE_FILE:

r = glob_item(i, write_one_file);

if (r < 0)

return r;

break;

case CREATE_DIRECTORY:

case TRUNCATE_DIRECTORY:

case CREATE_SUBVOLUME:

RUN_WITH_UMASK(0000)

mkdir_parents_label(i->path, 0755);

if (i->type == CREATE_SUBVOLUME) {

RUN_WITH_UMASK((~i->mode) & 0777)

r = btrfs_subvol_make(i->path);

} else

r = 0;

if (IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY) || r == -ENOTTY) {

RUN_WITH_UMASK(0000)

r = mkdir_label(i->path, i->mode);

}

if (r < 0) {

if (r != -EEXIST)

return log_error_errno(r, "Failed to create directory or subvolume %s: %m", i->path);

if (stat(i->path, &st) < 0)

return log_error_errno(errno, "stat(%s) failed: %m", i->path);

if (!S_ISDIR(st.st_mode)) {

log_debug("%s already exists and is not a directory.", i->path);

return 0;

}

}

r = item_set_perms(i, i->path);

if (r < 0)

return r;

r = item_set_xattrs(i, i->path);

if (r < 0)

return r;

break;

case CREATE_FIFO:

RUN_WITH_UMASK(0000) {

mac_selinux_create_file_prepare(i->path, S_IFIFO);

r = mkfifo(i->path, i->mode);

mac_selinux_create_file_clear();

}

if (r < 0) {

if (errno != EEXIST)

return log_error_errno(errno, "Failed to create fifo %s: %m", i->path);

if (stat(i->path, &st) < 0)

return log_error_errno(errno, "stat(%s) failed: %m", i->path);

if (!S_ISFIFO(st.st_mode)) {

if (i->force) {

RUN_WITH_UMASK(0000) {

mac_selinux_create_file_prepare(i->path, S_IFIFO);

r = mkfifo_atomic(i->path, i->mode);

mac_selinux_create_file_clear();

}

if (r < 0)

return log_error_errno(r, "Failed to create fifo %s: %m", i->path);

} else {

log_debug("%s is not a fifo.", i->path);

return 0;

}

}

}

r = item_set_perms(i, i->path);

if (r < 0)

return r;

r = item_set_xattrs(i, i->path);

if (r < 0)

return r;

break;

case CREATE_SYMLINK:

mac_selinux_create_file_prepare(i->path, S_IFLNK);

r = symlink(i->argument, i->path);

mac_selinux_create_file_clear();

if (r < 0) {

_cleanup_free_ char *x = NULL;

if (errno != EEXIST)

return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);

r = readlink_malloc(i->path, &x);

if (r < 0 || !streq(i->argument, x)) {

if (i->force) {

mac_selinux_create_file_prepare(i->path, S_IFLNK);

r = symlink_atomic(i->argument, i->path);

mac_selinux_create_file_clear();

if (r < 0)

return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);

} else {

log_debug("%s is not a symlink or does not point to the correct path.", i->path);

return 0;

}

}

}

r = item_set_xattrs(i, i->path);

if (r < 0)

return r;

break;

case CREATE_BLOCK_DEVICE:

case CREATE_CHAR_DEVICE: {

mode_t file_type;

if (have_effective_cap(CAP_MKNOD) == 0) {

/* In a container we lack CAP_MKNOD. We

log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);

return 0;

}

file_type = i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR;

RUN_WITH_UMASK(0000) {

mac_selinux_create_file_prepare(i->path, file_type);

r = mknod(i->path, i->mode | file_type, i->major_minor);

mac_selinux_create_file_clear();

}

if (r < 0) {

if (errno == EPERM) {

log_debug("We lack permissions, possibly because of cgroup configuration; "

"skipping creation of device node %s.", i->path);

return 0;

}

if (errno != EEXIST)

return log_error_errno(errno, "Failed to create device node %s: %m", i->path);

if (stat(i->path, &st) < 0)

return log_error_errno(errno, "stat(%s) failed: %m", i->path);

if ((st.st_mode & S_IFMT) != file_type) {

if (i->force) {

RUN_WITH_UMASK(0000) {

mac_selinux_create_file_prepare(i->path, file_type);

r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);

mac_selinux_create_file_clear();

}

if (r < 0)

return log_error_errno(r, "Failed to create device node %s: %m", i->path);

} else {

log_debug("%s is not a device node.", i->path);

return 0;

}

}

}

r = item_set_perms(i, i->path);

if (r < 0)

return r;

r = item_set_xattrs(i, i->path);

if (r < 0)

return r;

break;

}

case ADJUST_MODE:

case RELABEL_PATH:

r = glob_item(i, item_set_perms);

if (r < 0)

return r;

break;

case RECURSIVE_RELABEL_PATH:

r = glob_item(i, item_set_perms_recursive);

if (r < 0)

return r;

break;

case SET_XATTR:

r = item_set_xattrs(i, i->path);

if (r < 0)

return r;

break;

}

log_debug("%s created successfully.", i->path);

return 0;

}

static int remove_item_instance(Item *i, const char *instance) {

int r;

assert(i);

switch (i->type) {

case CREATE_FILE:

case TRUNCATE_FILE:

case CREATE_DIRECTORY:

case CREATE_SUBVOLUME:

case CREATE_FIFO:

case CREATE_SYMLINK:

case CREATE_BLOCK_DEVICE:

case CREATE_CHAR_DEVICE:

case IGNORE_PATH:

case IGNORE_DIRECTORY_PATH:

case ADJUST_MODE:

case RELABEL_PATH:

case RECURSIVE_RELABEL_PATH:

case WRITE_FILE:

case COPY_FILES:

case SET_XATTR:

break;

case REMOVE_PATH:

if (remove(instance) < 0 && errno != ENOENT)

return log_error_errno(errno, "remove(%s): %m", instance);

break;

case TRUNCATE_DIRECTORY:

case RECURSIVE_REMOVE_PATH:

/* FIXME: we probably should use dir_cleanup() here

r = rm_rf_dangerous(instance, false, i->type == RECURSIVE_REMOVE_PATH, false);

if (r < 0 && r != -ENOENT)

return log_error_errno(r, "rm_rf(%s): %m", instance);

break;

}

return 0;

}

static int remove_item(Item *i) {

int r = 0;

assert(i);

switch (i->type) {

case CREATE_FILE:

case TRUNCATE_FILE:

case CREATE_DIRECTORY:

case CREATE_SUBVOLUME:

case CREATE_FIFO:

case CREATE_SYMLINK:

case CREATE_CHAR_DEVICE:

case CREATE_BLOCK_DEVICE:

case IGNORE_PATH:

case IGNORE_DIRECTORY_PATH:

case ADJUST_MODE:

case RELABEL_PATH:

case RECURSIVE_RELABEL_PATH:

case WRITE_FILE:

case COPY_FILES:

case SET_XATTR:

break;

case REMOVE_PATH:

case TRUNCATE_DIRECTORY:

case RECURSIVE_REMOVE_PATH:

r = glob_item(i, remove_item_instance);

break;

}

return r;

}

static int clean_item_instance(Item *i, const char* instance) {

_cleanup_closedir_ DIR *d = NULL;

struct stat s, ps;

bool mountpoint;

int r;

usec_t cutoff, n;

assert(i);

if (!i->age_set)

return 0;

n = now(CLOCK_REALTIME);

if (n < i->age)

return 0;

cutoff = n - i->age;

d = opendir(instance);

if (!d) {

if (errno == ENOENT || errno == ENOTDIR)

return 0;

log_error_errno(errno, "Failed to open directory %s: %m", i->path);

return -errno;

}

if (fstat(dirfd(d), &s) < 0)

return log_error_errno(errno, "stat(%s) failed: %m", i->path);

if (!S_ISDIR(s.st_mode)) {

log_error("%s is not a directory.", i->path);

return -ENOTDIR;

}

if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)

return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);

mountpoint = s.st_dev != ps.st_dev ||

(s.st_dev == ps.st_dev && s.st_ino == ps.st_ino);

r = dir_cleanup(i, instance, d, &s, cutoff, s.st_dev, mountpoint,

MAX_DEPTH, i->keep_first_level);

return r;

}

static int clean_item(Item *i) {

int r = 0;

assert(i);

switch (i->type) {

case CREATE_DIRECTORY:

case CREATE_SUBVOLUME:

case TRUNCATE_DIRECTORY:

case IGNORE_PATH:

case COPY_FILES:

clean_item_instance(i, i->path);

break;

case IGNORE_DIRECTORY_PATH:

r = glob_item(i, clean_item_instance);

break;

default:

break;

}

return r;

}

static int process_item(Item *i) {

int r, q, p, t = 0;

_cleanup_free_ char *prefix = NULL;

assert(i);

if (i->done)

return 0;

i->done = true;

prefix = malloc(strlen(i->path) + 1);

if (!prefix)

return log_oom();

PATH_FOREACH_PREFIX(prefix, i->path) {

Item *j;

j = hashmap_get(items, prefix);

if (j) {

int s;

s = process_item(j);

if (s < 0 && t == 0)

t = s;

}

}

r = arg_create ? create_item(i) : 0;

q = arg_remove ? remove_item(i) : 0;

p = arg_clean ? clean_item(i) : 0;

return t < 0 ? t :

r < 0 ? r :

q < 0 ? q :

p;

}

static void item_free(Item *i) {

if (!i)

return;

free(i->path);

free(i->argument);

strv_free(i->xattrs);

free(i);

}

DEFINE_TRIVIAL_CLEANUP_FUNC(Item*, item_free);

static bool item_equal(Item *a, Item *b) {

assert(a);

assert(b);

if (!streq_ptr(a->path, b->path))

return false;

if (a->type != b->type)

return false;

if (a->uid_set != b->uid_set ||

(a->uid_set && a->uid != b->uid))

return false;

if (a->gid_set != b->gid_set ||

(a->gid_set && a->gid != b->gid))

return false;

if (a->mode_set != b->mode_set ||

(a->mode_set && a->mode != b->mode))

return false;

if (a->age_set != b->age_set ||

(a->age_set && a->age != b->age))

return false;

if ((a->type == CREATE_FILE ||

a->type == TRUNCATE_FILE ||

a->type == WRITE_FILE ||

a->type == CREATE_SYMLINK ||

a->type == COPY_FILES) &&

!streq_ptr(a->argument, b->argument))

return false;

if ((a->type == CREATE_CHAR_DEVICE ||

a->type == CREATE_BLOCK_DEVICE) &&

a->major_minor != b->major_minor)

return false;

return true;

}

static bool should_include_path(const char *path) {

char **prefix;

STRV_FOREACH(prefix, arg_exclude_prefixes)

if (path_startswith(path, *prefix))

return false;

STRV_FOREACH(prefix, arg_include_prefixes)

if (path_startswith(path, *prefix))

return true;

/* no matches, so we should include this path only if we

return strv_length(arg_include_prefixes) == 0;

}

static int parse_line(const char *fname, unsigned line, const char *buffer) {

static const Specifier specifier_table[] = {

{ 'm', specifier_machine_id, NULL },

{ 'b', specifier_boot_id, NULL },

{ 'H', specifier_host_name, NULL },

{ 'v', specifier_kernel_release, NULL },

{}

};

_cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;

_cleanup_(item_freep) Item *i = NULL;

Item *existing;

Hashmap *h;

int r, n = -1, pos;

bool force = false, boot = false;

assert(fname);

assert(line >= 1);

assert(buffer);

r = sscanf(buffer,

"%ms %ms %ms %ms %ms %ms %n",

&action,

&path,

&mode,

&user,

&group,

&age,

&n);

if (r < 2) {

log_error("[%s:%u] Syntax error.", fname, line);

return -EIO;

}

if (isempty(action)) {

log_error("[%s:%u] Command too short '%s'.", fname, line, action);

return -EINVAL;

}

for (pos = 1; action[pos]; pos++) {

if (action[pos] == '!' && !boot)

boot = true;

else if (action[pos] == '+' && !force)

force = true;

else {

log_error("[%s:%u] Unknown modifiers in command '%s'",

fname, line, action);

return -EINVAL;

}

}

if (boot && !arg_boot)

return 0;

i = new0(Item, 1);

if (!i)

return log_oom();

i->type = action[0];

i->force = force;

r = specifier_printf(path, specifier_table, NULL, &i->path);

if (r < 0) {

log_error("[%s:%u] Failed to replace specifiers: %s", fname, line, path);

return r;

}

if (n >= 0) {

n += strspn(buffer+n, WHITESPACE);

if (buffer[n] != 0 && (buffer[n] != '-' || buffer[n+1] != 0)) {

i->argument = unquote(buffer+n, "\"");

if (!i->argument)

return log_oom();

}

}

switch (i->type) {

case CREATE_FILE:

case TRUNCATE_FILE:

case CREATE_DIRECTORY:

case CREATE_SUBVOLUME:

case TRUNCATE_DIRECTORY:

case CREATE_FIFO:

case IGNORE_PATH:

case IGNORE_DIRECTORY_PATH:

case REMOVE_PATH:

case RECURSIVE_REMOVE_PATH:

case ADJUST_MODE:

case RELABEL_PATH:

case RECURSIVE_RELABEL_PATH:

break;

case CREATE_SYMLINK:

if (!i->argument) {

i->argument = strappend("/usr/share/factory/", i->path);

if (!i->argument)

return log_oom();

}

break;

case WRITE_FILE:

if (!i->argument) {

log_error("[%s:%u] Write file requires argument.", fname, line);

return -EBADMSG;

}

break;

case COPY_FILES:

if (!i->argument) {

i->argument = strappend("/usr/share/factory/", i->path);

if (!i->argument)

return log_oom();

} else if (!path_is_absolute(i->argument)) {

log_error("[%s:%u] Source path is not absolute.", fname, line);

return -EBADMSG;

}

path_kill_slashes(i->argument);

break;

case CREATE_CHAR_DEVICE:

case CREATE_BLOCK_DEVICE: {

unsigned major, minor;

if (!i->argument) {

log_error("[%s:%u] Device file requires argument.", fname, line);

return -EBADMSG;

}

if (sscanf(i->argument, "%u:%u", &major, &minor) != 2) {

log_error("[%s:%u] Can't parse device file major/minor '%s'.", fname, line, i->argument);

return -EBADMSG;

}

i->major_minor = makedev(major, minor);

break;

}

case SET_XATTR:

if (!i->argument) {

log_error("[%s:%u] Set extended attribute requires argument.", fname, line);

return -EBADMSG;

}

r = get_xattrs_from_arg(i);

if (r < 0)

return r;

break;

default:

log_error("[%s:%u] Unknown command type '%c'.", fname, line, i->type);

return -EBADMSG;

}

if (!path_is_absolute(i->path)) {

log_error("[%s:%u] Path '%s' not absolute.", fname, line, i->path);

return -EBADMSG;

}

path_kill_slashes(i->path);

if (!should_include_path(i->path))

return 0;

if (arg_root) {

char *p;

p = strappend(arg_root, i->path);

if (!p)

return log_oom();

free(i->path);

i->path = p;

}

if (user && !streq(user, "-")) {

const char *u = user;

r = get_user_creds(&u, &i->uid, NULL, NULL, NULL);

if (r < 0) {

log_error("[%s:%u] Unknown user '%s'.", fname, line, user);

return r;

}

i->uid_set = true;

}

if (group && !streq(group, "-")) {

const char *g = group;

r = get_group_creds(&g, &i->gid);

if (r < 0) {

log_error("[%s:%u] Unknown group '%s'.", fname, line, group);

return r;

}

i->gid_set = true;

}

if (mode && !streq(mode, "-")) {

const char *mm = mode;

unsigned m;

if (*mm == '~') {

i->mask_perms = true;

mm++;

}

if (sscanf(mm, "%o", &m) != 1) {

log_error("[%s:%u] Invalid mode '%s'.", fname, line, mode);

return -ENOENT;

}

i->mode = m;

i->mode_set = true;

} else

i->mode =

i->type == CREATE_DIRECTORY ||

i->type == CREATE_SUBVOLUME ||

i->type == TRUNCATE_DIRECTORY ? 0755 : 0644;

if (age && !streq(age, "-")) {

const char *a = age;

if (*a == '~') {

i->keep_first_level = true;

a++;

}

if (parse_sec(a, &i->age) < 0) {

log_error("[%s:%u] Invalid age '%s'.", fname, line, age);

return -EBADMSG;

}

i->age_set = true;

}

h = needs_glob(i->type) ? globs : items;

existing = hashmap_get(h, i->path);

if (existing) {

if (i->type == SET_XATTR) {

r = strv_extend_strv(&existing->xattrs, i->xattrs);

if (r < 0)

return log_oom();

return 0;

} else if (existing->type == SET_XATTR) {

r = strv_extend_strv(&i->xattrs, existing->xattrs);

if (r < 0)

return log_oom();

r = hashmap_replace(h, i->path, i);

if (r < 0) {

log_error("Failed to replace item for %s.", i->path);

return r;

}

item_free(existing);

} else {

/* Two identical items are fine */

if (!item_equal(existing, i))

log_warning("[%s:%u] Duplicate line for path \"%s\", ignoring.",

fname, line, i->path);

return 0;

}

} else {

r = hashmap_put(h, i->path, i);

if (r < 0) {

log_error("Failed to insert item %s: %s", i->path, strerror(-r));

return r;

}

}

i = NULL; /* avoid cleanup */

return 0;

}

static void help(void) {

printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"

"Creates, deletes and cleans up volatile and temporary files and directories.\n\n"

" -h --help Show this help\n"

" --version Show package version\n"

" --create Create marked files/directories\n"

" --clean Clean up marked directories\n"

" --remove Remove marked files/directories\n"

" --boot Execute actions only safe at boot\n"

" --prefix=PATH Only apply rules that apply to paths with the specified prefix\n"

" --exclude-prefix=PATH Ignore rules that apply to paths with the specified prefix\n"

" --root=PATH Operate on an alternate filesystem root\n",

program_invocation_short_name);

}

static int parse_argv(int argc, char *argv[]) {

enum {

ARG_VERSION = 0x100,

ARG_CREATE,

ARG_CLEAN,

ARG_REMOVE,

ARG_BOOT,

ARG_PREFIX,

ARG_EXCLUDE_PREFIX,

ARG_ROOT,

};

static const struct option options[] = {

{ "help", no_argument, NULL, 'h' },

{ "version", no_argument, NULL, ARG_VERSION },

{ "create", no_argument, NULL, ARG_CREATE },

{ "clean", no_argument, NULL, ARG_CLEAN },

{ "remove", no_argument, NULL, ARG_REMOVE },

{ "boot", no_argument, NULL, ARG_BOOT },

{ "prefix", required_argument, NULL, ARG_PREFIX },

{ "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },

{ "root", required_argument, NULL, ARG_ROOT },

{}

};

int c;

assert(argc >= 0);

assert(argv);

while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)

switch (c) {

case 'h':

help();

return 0;

case ARG_VERSION:

puts(PACKAGE_STRING);

puts(SYSTEMD_FEATURES);

return 0;

case ARG_CREATE:

arg_create = true;

break;

case ARG_CLEAN:

arg_clean = true;

break;

case ARG_REMOVE:

arg_remove = true;

break;

case ARG_BOOT:

arg_boot = true;

break;

case ARG_PREFIX:

if (strv_push(&arg_include_prefixes, optarg) < 0)

return log_oom();

break;

case ARG_EXCLUDE_PREFIX:

if (strv_push(&arg_exclude_prefixes, optarg) < 0)

return log_oom();

break;

case ARG_ROOT:

free(arg_root);

arg_root = path_make_absolute_cwd(optarg);

if (!arg_root)

return log_oom();

path_kill_slashes(arg_root);

break;

case '?':

return -EINVAL;

default:

assert_not_reached("Unhandled option");

}

if (!arg_clean && !arg_create && !arg_remove) {

log_error("You need to specify at least one of --clean, --create or --remove.");

return -EINVAL;

}

return 1;

}

static int read_config_file(const char *fn, bool ignore_enoent) {

_cleanup_fclose_ FILE *f = NULL;

char line[LINE_MAX];

Iterator iterator;

unsigned v = 0;

Item *i;

int r;

assert(fn);

r = search_and_fopen_nulstr(fn, "re", arg_root, conf_file_dirs, &f);

if (r < 0) {

if (ignore_enoent && r == -ENOENT)

return 0;

return log_error_errno(r, "Failed to open '%s', ignoring: %m", fn);

}

FOREACH_LINE(line, f, break) {

char *l;

int k;

v++;

l = strstrip(line);

if (*l == '#' || *l == 0)

continue;

k = parse_line(fn, v, l);

if (k < 0 && r == 0)

r = k;

}

/* we have to determine age parameter for each entry of type X */

HASHMAP_FOREACH(i, globs, iterator) {

Iterator iter;

Item *j, *candidate_item = NULL;

if (i->type != IGNORE_DIRECTORY_PATH)

continue;

HASHMAP_FOREACH(j, items, iter) {

if (j->type != CREATE_DIRECTORY && j->type != TRUNCATE_DIRECTORY && j->type != CREATE_SUBVOLUME)

continue;

if (path_equal(j->path, i->path)) {

candidate_item = j;

break;

}

if ((!candidate_item && path_startswith(i->path, j->path)) ||

(candidate_item && path_startswith(j->path, candidate_item->path) && (fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)))

candidate_item = j;

}

if (candidate_item && candidate_item->age_set) {

i->age = candidate_item->age;

i->age_set = true;

}

}

if (ferror(f)) {

log_error_errno(errno, "Failed to read from file %s: %m", fn);

if (r == 0)

r = -EIO;

}

return r;

}

int main(int argc, char *argv[]) {

int r, k;

Item *i;

Iterator iterator;

r = parse_argv(argc, argv);

if (r <= 0)

goto finish;

log_set_target(LOG_TARGET_AUTO);

log_parse_environment();

log_open();

umask(0022);

mac_selinux_init(NULL);

items = hashmap_new(&string_hash_ops);

globs = hashmap_new(&string_hash_ops);

if (!items || !globs) {

r = log_oom();

goto finish;

}

r = 0;

if (optind < argc) {

int j;

for (j = optind; j < argc; j++) {

k = read_config_file(argv[j], false);

if (k < 0 && r == 0)

r = k;

}

} else {

_cleanup_strv_free_ char **files = NULL;

char **f;

r = conf_files_list_nulstr(&files, ".conf", arg_root, conf_file_dirs);

if (r < 0) {

log_error_errno(r, "Failed to enumerate tmpfiles.d files: %m");

goto finish;

}

STRV_FOREACH(f, files) {

k = read_config_file(*f, true);

if (k < 0 && r == 0)

r = k;

}

}

HASHMAP_FOREACH(i, globs, iterator) {

k = process_item(i);

if (k < 0 && r == 0)

r = k;

}

HASHMAP_FOREACH(i, items, iterator) {

k = process_item(i);

if (k < 0 && r == 0)

r = k;

}

finish:

while ((i = hashmap_steal_first(items)))

item_free(i);

while ((i = hashmap_steal_first(globs)))

item_free(i);

hashmap_free(items);

hashmap_free(globs);

free(arg_include_prefixes);

free(arg_exclude_prefixes);

free(arg_root);

set_free_free(unix_sockets);

mac_selinux_finish();

return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;

}