/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering, Kay Sievers systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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" /* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates * them in the file system. This is intended to be used to create * properly owned directories beneath /tmp, /var/tmp, /run, which are * volatile and hence need to be recreated on bootup. */ typedef enum ItemType { /* These ones take file names */ CREATE_FILE = 'f', TRUNCATE_FILE = 'F', CREATE_DIRECTORY = 'd', TRUNCATE_DIRECTORY = 'D', CREATE_FIFO = 'p', CREATE_SYMLINK = 'L', CREATE_CHAR_DEVICE = 'c', CREATE_BLOCK_DEVICE = 'b', COPY_FILES = 'C', /* 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; 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 * /proc/net/unix to speed things up a little. */ 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 = { .handle.handle_bytes = MAX_HANDLE_SZ }; 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 * of both queries was not supported by the filesystem */ 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("stat(%s/%s) failed: %m", p, dent->d_name); else log_error("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 * do not differ in device major/minors. This type of query is not * supported on all kernels or filesystem types though. */ 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("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 * support the sticky bit for excluding * directories from cleaning like we do it for * other file system objects: well, the sticky * bit already has a meaning for directories, * so we don't want to overload that. */ 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("rmdir(%s): %m", sub_path); r = -errno; } } } } else { /* Skip files for which the sticky bit is * set. These are semantics we define, and are * unknown elsewhere. See XDG_RUNTIME_DIR * specification for details. */ 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 * requested */ 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("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("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) { log_error("chmod(%s) failed: %m", path); return -errno; } } } 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_t) -1, i->gid_set ? i->gid : (gid_t) -1) < 0) { log_error("chown(%s) failed: %m", path); return -errno; } return label_fix(path, false, false); } 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("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) { log_error("stat(%s) failed: %m", path); return -errno; } 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; 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 * tries to go on */ 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("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) { log_error_errno(r, "Failed to copy files to %s: %m", i->path); return -r; } if (stat(i->argument, &a) < 0) { log_error("stat(%s) failed: %m", i->argument); return -errno; } if (stat(i->path, &b) < 0) { log_error("stat(%s) failed: %m", i->path); return -errno; } 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 TRUNCATE_DIRECTORY: case CREATE_DIRECTORY: RUN_WITH_UMASK(0000) { mkdir_parents_label(i->path, 0755); r = mkdir_label(i->path, i->mode); } if (r < 0) { if (r != -EEXIST) return log_error_errno(r, "Failed to create directory %s: %m", i->path); if (stat(i->path, &st) < 0) { log_error("stat(%s) failed: %m", i->path); return -errno; } 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; 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) { log_error("Failed to create fifo %s: %m", i->path); return -errno; } if (stat(i->path, &st) < 0) { log_error("stat(%s) failed: %m", i->path); return -errno; } 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; 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) { log_error("symlink(%s, %s) failed: %m", i->argument, i->path); return -errno; } 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; } } } 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 shouldn't attempt to create the device node in that case to avoid noise, and we don't support virtualized devices in containers anyway. */ 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) { log_error("Failed to create device node %s: %m", i->path); return -errno; } if (stat(i->path, &st) < 0) { log_error("stat(%s) failed: %m", i->path); return -errno; } 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; 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; } 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_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: break; case REMOVE_PATH: if (remove(instance) < 0 && errno != ENOENT) { log_error("remove(%s): %m", instance); return -errno; } break; case TRUNCATE_DIRECTORY: case RECURSIVE_REMOVE_PATH: /* FIXME: we probably should use dir_cleanup() here * instead of rm_rf() so that 'x' is honoured. */ 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_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: 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("Failed to open directory %s: %m", i->path); return -errno; } if (fstat(dirfd(d), &s) < 0) { log_error("stat(%s) failed: %m", i->path); return -errno; } 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) { log_error("stat(%s/..) failed: %m", i->path); return -errno; } 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 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; _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) process_item(j); } r = arg_create ? create_item(i) : 0; q = arg_remove ? remove_item(i) : 0; p = arg_clean ? clean_item(i) : 0; if (r < 0) return r; if (q < 0) return q; return p; } static void item_free(Item *i) { if (!i) return; free(i->path); free(i->argument); 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 * have no whitelist at all */ 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; char type; Hashmap *h; int r, n = -1; 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; } if (strlen(action) > 1 && !in_charset(action+1, "!+")) { log_error("[%s:%u] Unknown modifiers in command '%s'", fname, line, action); return -EINVAL; } if (strchr(action+1, '!') && !arg_boot) return 0; type = action[0]; i = new0(Item, 1); if (!i) return log_oom(); i->force = !!strchr(action+1, '+'); 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 (type) { case CREATE_FILE: case TRUNCATE_FILE: case CREATE_DIRECTORY: 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(); } 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; } default: log_error("[%s:%u] Unknown command type '%c'.", fname, line, type); return -EBADMSG; } i->type = type; 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 == 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) { /* Two identical items are fine */ if (!item_equal(existing, i)) log_warning("Two or more conflicting lines for %s configured, ignoring.", i->path); return 0; } r = hashmap_put(h, i->path, i); if (r < 0) return log_error_errno(r, "Failed to insert item %s: %m", i->path); 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; log_error_errno(r, "Failed to open '%s', ignoring: %m", fn); return r; } 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) 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("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) process_item(i); HASHMAP_FOREACH(i, items, iterator) process_item(i); 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; }