469 lines
12 KiB
C
469 lines
12 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/epoll.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "util.h"
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#include "mkdir.h"
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#include "path-util.h"
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#include "logind-inhibit.h"
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Inhibitor* inhibitor_new(Manager *m, const char* id) {
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Inhibitor *i;
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assert(m);
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i = new0(Inhibitor, 1);
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if (!i)
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return NULL;
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i->state_file = strappend("/run/systemd/inhibit/", id);
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if (!i->state_file) {
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free(i);
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return NULL;
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}
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i->id = path_get_file_name(i->state_file);
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if (hashmap_put(m->inhibitors, i->id, i) < 0) {
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free(i->state_file);
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free(i);
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return NULL;
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}
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i->manager = m;
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i->fifo_fd = -1;
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return i;
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}
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void inhibitor_free(Inhibitor *i) {
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assert(i);
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free(i->who);
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free(i->why);
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hashmap_remove(i->manager->inhibitors, i->id);
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inhibitor_remove_fifo(i);
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if (i->state_file) {
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unlink(i->state_file);
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free(i->state_file);
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}
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free(i);
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}
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int inhibitor_save(Inhibitor *i) {
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char *temp_path, *cc;
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int r;
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FILE *f;
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assert(i);
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r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0);
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if (r < 0)
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goto finish;
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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 finish;
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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=%lu\n"
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"PID=%lu\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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(unsigned long) i->uid,
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(unsigned long) i->pid);
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if (i->who) {
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cc = cescape(i->who);
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if (!cc)
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r = -ENOMEM;
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else {
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fprintf(f, "WHO=%s\n", cc);
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free(cc);
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}
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}
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if (i->why) {
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cc = cescape(i->why);
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if (!cc)
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r = -ENOMEM;
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else {
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fprintf(f, "WHY=%s\n", cc);
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free(cc);
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}
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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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fflush(f);
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if (ferror(f) || rename(temp_path, i->state_file) < 0) {
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r = -errno;
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unlink(i->state_file);
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unlink(temp_path);
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}
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fclose(f);
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free(temp_path);
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finish:
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if (r < 0)
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log_error("Failed to save inhibit data for %s: %s", i->id, strerror(-r));
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return r;
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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=%lu uid=%lu mode=%s started.",
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strna(i->who), strna(i->why),
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(unsigned long) i->pid, (unsigned long) i->uid,
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inhibit_mode_to_string(i->mode));
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inhibitor_save(i);
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i->started = true;
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manager_send_changed(i->manager, i->mode == INHIBIT_BLOCK ? "BlockInhibited\0" : "DelayInhibited\0");
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return 0;
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}
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int 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=%lu uid=%lu mode=%s stopped.",
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strna(i->who), strna(i->why),
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(unsigned long) i->pid, (unsigned long) i->uid,
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inhibit_mode_to_string(i->mode));
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if (i->state_file)
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unlink(i->state_file);
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i->started = false;
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manager_send_changed(i->manager, i->mode == INHIBIT_BLOCK ? "BlockInhibited\0" : "DelayInhibited\0");
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return 0;
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}
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int inhibitor_load(Inhibitor *i) {
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InhibitWhat w;
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InhibitMode mm;
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int r;
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char *cc,
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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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r = parse_env_file(i->state_file, NEWLINE,
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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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NULL);
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if (r < 0)
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goto finish;
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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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goto finish;
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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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goto finish;
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}
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if (who) {
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cc = cunescape(who);
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if (!cc) {
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r = -ENOMEM;
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goto finish;
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}
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free(i->who);
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i->who = cc;
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}
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if (why) {
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cc = cunescape(why);
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if (!cc) {
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r = -ENOMEM;
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goto finish;
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}
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free(i->why);
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i->why = cc;
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}
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if (i->fifo_path) {
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int fd;
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fd = inhibitor_create_fifo(i);
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if (fd >= 0)
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close_nointr_nofail(fd);
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}
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finish:
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free(what);
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free(uid);
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free(pid);
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free(who);
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free(why);
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return r;
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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);
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if (r < 0)
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return r;
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if (asprintf(&i->fifo_path, "/run/systemd/inhibit/%s.ref", i->id) < 0)
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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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struct epoll_event ev;
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i->fifo_fd = open(i->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
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if (i->fifo_fd < 0)
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return -errno;
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r = hashmap_put(i->manager->inhibitor_fds, INT_TO_PTR(i->fifo_fd + 1), i);
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if (r < 0)
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return r;
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zero(ev);
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ev.events = 0;
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ev.data.u32 = FD_OTHER_BASE + i->fifo_fd;
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if (epoll_ctl(i->manager->epoll_fd, EPOLL_CTL_ADD, i->fifo_fd, &ev) < 0)
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return -errno;
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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_NDELAY);
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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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void inhibitor_remove_fifo(Inhibitor *i) {
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assert(i);
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if (i->fifo_fd >= 0) {
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assert_se(hashmap_remove(i->manager->inhibitor_fds, INT_TO_PTR(i->fifo_fd + 1)) == i);
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assert_se(epoll_ctl(i->manager->epoll_fd, EPOLL_CTL_DEL, i->fifo_fd, NULL) == 0);
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close_nointr_nofail(i->fifo_fd);
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i->fifo_fd = -1;
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}
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if (i->fifo_path) {
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unlink(i->fifo_path);
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free(i->fifo_path);
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i->fifo_path = NULL;
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}
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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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Iterator j;
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InhibitWhat what = 0;
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assert(m);
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HASHMAP_FOREACH(i, m->inhibitor_fds, j)
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if (i->mode == mm)
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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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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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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 *i;
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Iterator j;
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struct dual_timestamp ts = { 0, 0 };
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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->inhibitor_fds, j) {
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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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}
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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 char buffer[97];
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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 (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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InhibitWhat inhibit_what_from_string(const char *s) {
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InhibitWhat what = 0;
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char *w, *state;
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size_t l;
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FOREACH_WORD_SEPARATOR(w, l, s, ":", state) {
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if (l == 8 && strncmp(w, "shutdown", l) == 0)
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what |= INHIBIT_SHUTDOWN;
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else if (l == 5 && strncmp(w, "sleep", l) == 0)
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what |= INHIBIT_SLEEP;
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else if (l == 4 && strncmp(w, "idle", l) == 0)
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what |= INHIBIT_IDLE;
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else if (l == 16 && strncmp(w, "handle-power-key", l) == 0)
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what |= INHIBIT_HANDLE_POWER_KEY;
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else if (l == 18 && strncmp(w, "handle-suspend-key", l) == 0)
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what |= INHIBIT_HANDLE_SUSPEND_KEY;
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else if (l == 20 && strncmp(w, "handle-hibernate-key", l) == 0)
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what |= INHIBIT_HANDLE_HIBERNATE_KEY;
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else if (l == 17 && strncmp(w, "handle-lid-switch", l) == 0)
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what |= INHIBIT_HANDLE_LID_SWITCH;
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else
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return _INHIBIT_WHAT_INVALID;
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}
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return what;
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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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