538 lines
14 KiB
C
538 lines
14 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "env-file.h"
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#include "errno-list.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "format-util.h"
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#include "io-util.h"
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#include "logind-dbus.h"
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#include "logind-inhibit.h"
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#include "mkdir.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "tmpfile-util.h"
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#include "user-util.h"
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#include "util.h"
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static void inhibitor_remove_fifo(Inhibitor *i);
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int inhibitor_new(Inhibitor **ret, Manager *m, const char* id) {
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_cleanup_(inhibitor_freep) Inhibitor *i = NULL;
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int r;
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assert(ret);
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assert(m);
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assert(id);
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i = new(Inhibitor, 1);
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if (!i)
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return -ENOMEM;
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*i = (Inhibitor) {
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.manager = m,
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.what = _INHIBIT_WHAT_INVALID,
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.mode = _INHIBIT_MODE_INVALID,
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.uid = UID_INVALID,
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.fifo_fd = -1,
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};
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i->state_file = path_join("/run/systemd/inhibit", id);
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if (!i->state_file)
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return -ENOMEM;
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i->id = basename(i->state_file);
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r = hashmap_put(m->inhibitors, i->id, i);
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if (r < 0)
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return r;
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*ret = TAKE_PTR(i);
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return 0;
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}
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Inhibitor* inhibitor_free(Inhibitor *i) {
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if (!i)
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return NULL;
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free(i->who);
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free(i->why);
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sd_event_source_unref(i->event_source);
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safe_close(i->fifo_fd);
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hashmap_remove(i->manager->inhibitors, i->id);
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/* Note that we don't remove neither the state file nor the fifo path here, since we want both to
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* survive daemon restarts */
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free(i->state_file);
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free(i->fifo_path);
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return mfree(i);
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}
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static int inhibitor_save(Inhibitor *i) {
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_cleanup_free_ char *temp_path = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(i);
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r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0, MKDIR_WARN_MODE);
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if (r < 0)
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goto fail;
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r = fopen_temporary(i->state_file, &f, &temp_path);
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if (r < 0)
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goto fail;
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(void) fchmod(fileno(f), 0644);
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fprintf(f,
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"# This is private data. Do not parse.\n"
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"WHAT=%s\n"
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"MODE=%s\n"
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"UID="UID_FMT"\n"
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"PID="PID_FMT"\n",
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inhibit_what_to_string(i->what),
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inhibit_mode_to_string(i->mode),
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i->uid,
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i->pid);
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if (i->who) {
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_cleanup_free_ char *cc = NULL;
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cc = cescape(i->who);
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if (!cc) {
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r = -ENOMEM;
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goto fail;
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}
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fprintf(f, "WHO=%s\n", cc);
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}
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if (i->why) {
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_cleanup_free_ char *cc = NULL;
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cc = cescape(i->why);
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if (!cc) {
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r = -ENOMEM;
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goto fail;
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}
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fprintf(f, "WHY=%s\n", cc);
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}
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if (i->fifo_path)
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fprintf(f, "FIFO=%s\n", i->fifo_path);
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r = fflush_and_check(f);
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if (r < 0)
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goto fail;
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if (rename(temp_path, i->state_file) < 0) {
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r = -errno;
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goto fail;
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}
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return 0;
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fail:
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(void) unlink(i->state_file);
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if (temp_path)
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(void) unlink(temp_path);
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return log_error_errno(r, "Failed to save inhibit data %s: %m", i->state_file);
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}
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static int bus_manager_send_inhibited_change(Inhibitor *i) {
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const char *property;
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assert(i);
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property = i->mode == INHIBIT_BLOCK ? "BlockInhibited" : "DelayInhibited";
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return manager_send_changed(i->manager, property, NULL);
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}
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int inhibitor_start(Inhibitor *i) {
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assert(i);
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if (i->started)
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return 0;
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dual_timestamp_get(&i->since);
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log_debug("Inhibitor %s (%s) pid="PID_FMT" uid="UID_FMT" mode=%s started.",
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strna(i->who), strna(i->why),
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i->pid, i->uid,
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inhibit_mode_to_string(i->mode));
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i->started = true;
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inhibitor_save(i);
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bus_manager_send_inhibited_change(i);
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return 0;
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}
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void inhibitor_stop(Inhibitor *i) {
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assert(i);
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if (i->started)
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log_debug("Inhibitor %s (%s) pid="PID_FMT" uid="UID_FMT" mode=%s stopped.",
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strna(i->who), strna(i->why),
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i->pid, i->uid,
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inhibit_mode_to_string(i->mode));
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inhibitor_remove_fifo(i);
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if (i->state_file)
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(void) unlink(i->state_file);
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i->started = false;
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bus_manager_send_inhibited_change(i);
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}
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int inhibitor_load(Inhibitor *i) {
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_cleanup_free_ char
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*what = NULL,
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*uid = NULL,
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*pid = NULL,
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*who = NULL,
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*why = NULL,
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*mode = NULL;
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InhibitWhat w;
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InhibitMode mm;
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char *cc;
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int r;
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r = parse_env_file(NULL, i->state_file,
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"WHAT", &what,
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"UID", &uid,
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"PID", &pid,
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"WHO", &who,
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"WHY", &why,
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"MODE", &mode,
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"FIFO", &i->fifo_path);
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if (r < 0)
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return log_error_errno(r, "Failed to read %s: %m", i->state_file);
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w = what ? inhibit_what_from_string(what) : 0;
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if (w >= 0)
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i->what = w;
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mm = mode ? inhibit_mode_from_string(mode) : INHIBIT_BLOCK;
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if (mm >= 0)
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i->mode = mm;
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if (uid) {
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r = parse_uid(uid, &i->uid);
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if (r < 0)
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log_debug_errno(r, "Failed to parse UID of inhibitor: %s", uid);
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}
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if (pid) {
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r = parse_pid(pid, &i->pid);
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if (r < 0)
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log_debug_errno(r, "Failed to parse PID of inhibitor: %s", pid);
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}
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if (who) {
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r = cunescape(who, 0, &cc);
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if (r < 0)
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return log_oom();
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free_and_replace(i->who, cc);
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}
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if (why) {
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r = cunescape(why, 0, &cc);
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if (r < 0)
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return log_oom();
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free_and_replace(i->why, cc);
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}
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if (i->fifo_path) {
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_cleanup_close_ int fd = -1;
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/* Let's re-open the FIFO on both sides, and close the writing side right away */
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fd = inhibitor_create_fifo(i);
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if (fd < 0)
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return log_error_errno(fd, "Failed to reopen FIFO: %m");
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}
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return 0;
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}
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static int inhibitor_dispatch_fifo(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
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Inhibitor *i = userdata;
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assert(s);
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assert(fd == i->fifo_fd);
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assert(i);
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inhibitor_stop(i);
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inhibitor_free(i);
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return 0;
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}
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int inhibitor_create_fifo(Inhibitor *i) {
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int r;
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assert(i);
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/* Create FIFO */
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if (!i->fifo_path) {
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r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0, MKDIR_WARN_MODE);
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if (r < 0)
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return r;
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i->fifo_path = strjoin("/run/systemd/inhibit/", i->id, ".ref");
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if (!i->fifo_path)
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return -ENOMEM;
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if (mkfifo(i->fifo_path, 0600) < 0 && errno != EEXIST)
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return -errno;
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}
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/* Open reading side */
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if (i->fifo_fd < 0) {
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i->fifo_fd = open(i->fifo_path, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
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if (i->fifo_fd < 0)
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return -errno;
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}
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if (!i->event_source) {
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r = sd_event_add_io(i->manager->event, &i->event_source, i->fifo_fd, 0, inhibitor_dispatch_fifo, i);
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if (r < 0)
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return r;
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r = sd_event_source_set_priority(i->event_source, SD_EVENT_PRIORITY_IDLE-10);
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if (r < 0)
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return r;
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(void) sd_event_source_set_description(i->event_source, "inhibitor-ref");
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}
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/* Open writing side */
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r = open(i->fifo_path, O_WRONLY|O_CLOEXEC|O_NONBLOCK);
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if (r < 0)
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return -errno;
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return r;
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}
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static void inhibitor_remove_fifo(Inhibitor *i) {
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assert(i);
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i->event_source = sd_event_source_unref(i->event_source);
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i->fifo_fd = safe_close(i->fifo_fd);
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if (i->fifo_path) {
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(void) unlink(i->fifo_path);
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i->fifo_path = mfree(i->fifo_path);
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}
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}
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bool inhibitor_is_orphan(Inhibitor *i) {
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assert(i);
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if (!i->started)
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return true;
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if (!i->fifo_path)
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return true;
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if (i->fifo_fd < 0)
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return true;
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if (pipe_eof(i->fifo_fd) != 0)
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return true;
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return false;
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}
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InhibitWhat manager_inhibit_what(Manager *m, InhibitMode mm) {
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Inhibitor *i;
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InhibitWhat what = 0;
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assert(m);
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HASHMAP_FOREACH(i, m->inhibitors)
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if (i->mode == mm && i->started)
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what |= i->what;
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return what;
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}
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static int pid_is_active(Manager *m, pid_t pid) {
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Session *s;
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int r;
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/* Get client session. This is not what you are looking for these days.
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* FIXME #6852 */
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r = manager_get_session_by_pid(m, pid, &s);
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if (r < 0)
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return r;
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/* If there's no session assigned to it, then it's globally
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* active on all ttys */
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if (r == 0)
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return 1;
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return session_is_active(s);
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}
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bool manager_is_inhibited(
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Manager *m,
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InhibitWhat w,
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InhibitMode mm,
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dual_timestamp *since,
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bool ignore_inactive,
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bool ignore_uid,
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uid_t uid,
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Inhibitor **offending) {
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Inhibitor *i;
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struct dual_timestamp ts = DUAL_TIMESTAMP_NULL;
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bool inhibited = false;
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assert(m);
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assert(w > 0 && w < _INHIBIT_WHAT_MAX);
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HASHMAP_FOREACH(i, m->inhibitors) {
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if (!i->started)
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continue;
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if (!(i->what & w))
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continue;
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if (i->mode != mm)
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continue;
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if (ignore_inactive && pid_is_active(m, i->pid) <= 0)
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continue;
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if (ignore_uid && i->uid == uid)
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continue;
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if (!inhibited ||
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i->since.monotonic < ts.monotonic)
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ts = i->since;
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inhibited = true;
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if (offending)
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*offending = i;
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}
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if (since)
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*since = ts;
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return inhibited;
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}
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const char *inhibit_what_to_string(InhibitWhat w) {
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static thread_local char buffer[STRLEN(
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"shutdown:"
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"sleep:"
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"idle:"
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"handle-power-key:"
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"handle-suspend-key:"
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"handle-hibernate-key:"
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"handle-lid-switch:"
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"handle-reboot-key")+1];
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char *p;
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if (w < 0 || w >= _INHIBIT_WHAT_MAX)
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return NULL;
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p = buffer;
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if (w & INHIBIT_SHUTDOWN)
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p = stpcpy(p, "shutdown:");
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if (w & INHIBIT_SLEEP)
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p = stpcpy(p, "sleep:");
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if (w & INHIBIT_IDLE)
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p = stpcpy(p, "idle:");
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if (w & INHIBIT_HANDLE_POWER_KEY)
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p = stpcpy(p, "handle-power-key:");
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if (w & INHIBIT_HANDLE_SUSPEND_KEY)
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p = stpcpy(p, "handle-suspend-key:");
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if (w & INHIBIT_HANDLE_HIBERNATE_KEY)
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p = stpcpy(p, "handle-hibernate-key:");
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if (w & INHIBIT_HANDLE_LID_SWITCH)
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p = stpcpy(p, "handle-lid-switch:");
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if (w & INHIBIT_HANDLE_REBOOT_KEY)
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p = stpcpy(p, "handle-reboot-key:");
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if (p > buffer)
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*(p-1) = 0;
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else
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*p = 0;
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return buffer;
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}
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int inhibit_what_from_string(const char *s) {
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InhibitWhat what = 0;
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for (const char *p = s;;) {
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_cleanup_free_ char *word = NULL;
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int r;
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/* A sanity check that our return values fit in an int */
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assert_cc((int) _INHIBIT_WHAT_MAX == _INHIBIT_WHAT_MAX);
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r = extract_first_word(&p, &word, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
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if (r < 0)
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return r;
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if (r == 0)
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return what;
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if (streq(word, "shutdown"))
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what |= INHIBIT_SHUTDOWN;
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else if (streq(word, "sleep"))
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what |= INHIBIT_SLEEP;
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else if (streq(word, "idle"))
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what |= INHIBIT_IDLE;
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else if (streq(word, "handle-power-key"))
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what |= INHIBIT_HANDLE_POWER_KEY;
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else if (streq(word, "handle-suspend-key"))
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what |= INHIBIT_HANDLE_SUSPEND_KEY;
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else if (streq(word, "handle-hibernate-key"))
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what |= INHIBIT_HANDLE_HIBERNATE_KEY;
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else if (streq(word, "handle-lid-switch"))
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what |= INHIBIT_HANDLE_LID_SWITCH;
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else if (streq(word, "handle-reboot-key"))
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what |= INHIBIT_HANDLE_REBOOT_KEY;
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else
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return _INHIBIT_WHAT_INVALID;
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}
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}
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static const char* const inhibit_mode_table[_INHIBIT_MODE_MAX] = {
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[INHIBIT_BLOCK] = "block",
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[INHIBIT_DELAY] = "delay"
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};
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DEFINE_STRING_TABLE_LOOKUP(inhibit_mode, InhibitMode);
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