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-rw-r--r--src/grp-login/systemd-logind/logind-inhibit.c486
1 files changed, 486 insertions, 0 deletions
diff --git a/src/grp-login/systemd-logind/logind-inhibit.c b/src/grp-login/systemd-logind/logind-inhibit.c
new file mode 100644
index 0000000000..cea4850a47
--- /dev/null
+++ b/src/grp-login/systemd-logind/logind-inhibit.c
@@ -0,0 +1,486 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ 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 <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/escape.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/formats-util.h"
+#include "systemd-basic/mkdir.h"
+#include "systemd-basic/parse-util.h"
+#include "systemd-basic/string-table.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/user-util.h"
+#include "systemd-basic/util.h"
+
+#include "logind-inhibit.h"
+
+Inhibitor* inhibitor_new(Manager *m, const char* id) {
+ Inhibitor *i;
+
+ assert(m);
+
+ i = new0(Inhibitor, 1);
+ if (!i)
+ return NULL;
+
+ i->state_file = strappend("/run/systemd/inhibit/", id);
+ if (!i->state_file) {
+ free(i);
+ return NULL;
+ }
+
+ i->id = basename(i->state_file);
+
+ if (hashmap_put(m->inhibitors, i->id, i) < 0) {
+ free(i->state_file);
+ free(i);
+ return NULL;
+ }
+
+ i->manager = m;
+ i->fifo_fd = -1;
+
+ return i;
+}
+
+void inhibitor_free(Inhibitor *i) {
+ assert(i);
+
+ hashmap_remove(i->manager->inhibitors, i->id);
+
+ inhibitor_remove_fifo(i);
+
+ free(i->who);
+ free(i->why);
+
+ if (i->state_file) {
+ unlink(i->state_file);
+ free(i->state_file);
+ }
+
+ free(i);
+}
+
+int inhibitor_save(Inhibitor *i) {
+ _cleanup_free_ char *temp_path = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+
+ assert(i);
+
+ r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0);
+ if (r < 0)
+ goto fail;
+
+ r = fopen_temporary(i->state_file, &f, &temp_path);
+ if (r < 0)
+ goto fail;
+
+ fchmod(fileno(f), 0644);
+
+ fprintf(f,
+ "# This is private data. Do not parse.\n"
+ "WHAT=%s\n"
+ "MODE=%s\n"
+ "UID="UID_FMT"\n"
+ "PID="PID_FMT"\n",
+ inhibit_what_to_string(i->what),
+ inhibit_mode_to_string(i->mode),
+ i->uid,
+ i->pid);
+
+ if (i->who) {
+ _cleanup_free_ char *cc = NULL;
+
+ cc = cescape(i->who);
+ if (!cc) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ fprintf(f, "WHO=%s\n", cc);
+ }
+
+ if (i->why) {
+ _cleanup_free_ char *cc = NULL;
+
+ cc = cescape(i->why);
+ if (!cc) {
+ r = -ENOMEM;
+ goto fail;
+ }
+
+ fprintf(f, "WHY=%s\n", cc);
+ }
+
+ if (i->fifo_path)
+ fprintf(f, "FIFO=%s\n", i->fifo_path);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ goto fail;
+
+ if (rename(temp_path, i->state_file) < 0) {
+ r = -errno;
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ (void) unlink(i->state_file);
+
+ if (temp_path)
+ (void) unlink(temp_path);
+
+ return log_error_errno(r, "Failed to save inhibit data %s: %m", i->state_file);
+}
+
+int inhibitor_start(Inhibitor *i) {
+ assert(i);
+
+ if (i->started)
+ return 0;
+
+ dual_timestamp_get(&i->since);
+
+ log_debug("Inhibitor %s (%s) pid="PID_FMT" uid="UID_FMT" mode=%s started.",
+ strna(i->who), strna(i->why),
+ i->pid, i->uid,
+ inhibit_mode_to_string(i->mode));
+
+ inhibitor_save(i);
+
+ i->started = true;
+
+ manager_send_changed(i->manager, i->mode == INHIBIT_BLOCK ? "BlockInhibited" : "DelayInhibited", NULL);
+
+ return 0;
+}
+
+int inhibitor_stop(Inhibitor *i) {
+ assert(i);
+
+ if (i->started)
+ log_debug("Inhibitor %s (%s) pid="PID_FMT" uid="UID_FMT" mode=%s stopped.",
+ strna(i->who), strna(i->why),
+ i->pid, i->uid,
+ inhibit_mode_to_string(i->mode));
+
+ if (i->state_file)
+ unlink(i->state_file);
+
+ i->started = false;
+
+ manager_send_changed(i->manager, i->mode == INHIBIT_BLOCK ? "BlockInhibited" : "DelayInhibited", NULL);
+
+ return 0;
+}
+
+int inhibitor_load(Inhibitor *i) {
+
+ _cleanup_free_ char
+ *what = NULL,
+ *uid = NULL,
+ *pid = NULL,
+ *who = NULL,
+ *why = NULL,
+ *mode = NULL;
+
+ InhibitWhat w;
+ InhibitMode mm;
+ char *cc;
+ int r;
+
+ r = parse_env_file(i->state_file, NEWLINE,
+ "WHAT", &what,
+ "UID", &uid,
+ "PID", &pid,
+ "WHO", &who,
+ "WHY", &why,
+ "MODE", &mode,
+ "FIFO", &i->fifo_path,
+ NULL);
+ if (r < 0)
+ return r;
+
+ w = what ? inhibit_what_from_string(what) : 0;
+ if (w >= 0)
+ i->what = w;
+
+ mm = mode ? inhibit_mode_from_string(mode) : INHIBIT_BLOCK;
+ if (mm >= 0)
+ i->mode = mm;
+
+ if (uid) {
+ r = parse_uid(uid, &i->uid);
+ if (r < 0)
+ return r;
+ }
+
+ if (pid) {
+ r = parse_pid(pid, &i->pid);
+ if (r < 0)
+ return r;
+ }
+
+ if (who) {
+ r = cunescape(who, 0, &cc);
+ if (r < 0)
+ return r;
+
+ free(i->who);
+ i->who = cc;
+ }
+
+ if (why) {
+ r = cunescape(why, 0, &cc);
+ if (r < 0)
+ return r;
+
+ free(i->why);
+ i->why = cc;
+ }
+
+ if (i->fifo_path) {
+ int fd;
+
+ fd = inhibitor_create_fifo(i);
+ safe_close(fd);
+ }
+
+ return 0;
+}
+
+static int inhibitor_dispatch_fifo(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+ Inhibitor *i = userdata;
+
+ assert(s);
+ assert(fd == i->fifo_fd);
+ assert(i);
+
+ inhibitor_stop(i);
+ inhibitor_free(i);
+
+ return 0;
+}
+
+int inhibitor_create_fifo(Inhibitor *i) {
+ int r;
+
+ assert(i);
+
+ /* Create FIFO */
+ if (!i->fifo_path) {
+ r = mkdir_safe_label("/run/systemd/inhibit", 0755, 0, 0);
+ if (r < 0)
+ return r;
+
+ i->fifo_path = strjoin("/run/systemd/inhibit/", i->id, ".ref", NULL);
+ if (!i->fifo_path)
+ return -ENOMEM;
+
+ if (mkfifo(i->fifo_path, 0600) < 0 && errno != EEXIST)
+ return -errno;
+ }
+
+ /* Open reading side */
+ if (i->fifo_fd < 0) {
+ i->fifo_fd = open(i->fifo_path, O_RDONLY|O_CLOEXEC|O_NDELAY);
+ if (i->fifo_fd < 0)
+ return -errno;
+ }
+
+ if (!i->event_source) {
+ r = sd_event_add_io(i->manager->event, &i->event_source, i->fifo_fd, 0, inhibitor_dispatch_fifo, i);
+ if (r < 0)
+ return r;
+
+ r = sd_event_source_set_priority(i->event_source, SD_EVENT_PRIORITY_IDLE-10);
+ if (r < 0)
+ return r;
+ }
+
+ /* Open writing side */
+ r = open(i->fifo_path, O_WRONLY|O_CLOEXEC|O_NDELAY);
+ if (r < 0)
+ return -errno;
+
+ return r;
+}
+
+void inhibitor_remove_fifo(Inhibitor *i) {
+ assert(i);
+
+ i->event_source = sd_event_source_unref(i->event_source);
+ i->fifo_fd = safe_close(i->fifo_fd);
+
+ if (i->fifo_path) {
+ unlink(i->fifo_path);
+ i->fifo_path = mfree(i->fifo_path);
+ }
+}
+
+InhibitWhat manager_inhibit_what(Manager *m, InhibitMode mm) {
+ Inhibitor *i;
+ Iterator j;
+ InhibitWhat what = 0;
+
+ assert(m);
+
+ HASHMAP_FOREACH(i, m->inhibitors, j)
+ if (i->mode == mm)
+ what |= i->what;
+
+ return what;
+}
+
+static int pid_is_active(Manager *m, pid_t pid) {
+ Session *s;
+ int r;
+
+ r = manager_get_session_by_pid(m, pid, &s);
+ if (r < 0)
+ return r;
+
+ /* If there's no session assigned to it, then it's globally
+ * active on all ttys */
+ if (r == 0)
+ return 1;
+
+ return session_is_active(s);
+}
+
+bool manager_is_inhibited(
+ Manager *m,
+ InhibitWhat w,
+ InhibitMode mm,
+ dual_timestamp *since,
+ bool ignore_inactive,
+ bool ignore_uid,
+ uid_t uid,
+ Inhibitor **offending) {
+
+ Inhibitor *i;
+ Iterator j;
+ struct dual_timestamp ts = DUAL_TIMESTAMP_NULL;
+ bool inhibited = false;
+
+ assert(m);
+ assert(w > 0 && w < _INHIBIT_WHAT_MAX);
+
+ HASHMAP_FOREACH(i, m->inhibitors, j) {
+ if (!(i->what & w))
+ continue;
+
+ if (i->mode != mm)
+ continue;
+
+ if (ignore_inactive && pid_is_active(m, i->pid) <= 0)
+ continue;
+
+ if (ignore_uid && i->uid == uid)
+ continue;
+
+ if (!inhibited ||
+ i->since.monotonic < ts.monotonic)
+ ts = i->since;
+
+ inhibited = true;
+
+ if (offending)
+ *offending = i;
+ }
+
+ if (since)
+ *since = ts;
+
+ return inhibited;
+}
+
+const char *inhibit_what_to_string(InhibitWhat w) {
+ static thread_local char buffer[97];
+ char *p;
+
+ if (w < 0 || w >= _INHIBIT_WHAT_MAX)
+ return NULL;
+
+ p = buffer;
+ if (w & INHIBIT_SHUTDOWN)
+ p = stpcpy(p, "shutdown:");
+ if (w & INHIBIT_SLEEP)
+ p = stpcpy(p, "sleep:");
+ if (w & INHIBIT_IDLE)
+ p = stpcpy(p, "idle:");
+ if (w & INHIBIT_HANDLE_POWER_KEY)
+ p = stpcpy(p, "handle-power-key:");
+ if (w & INHIBIT_HANDLE_SUSPEND_KEY)
+ p = stpcpy(p, "handle-suspend-key:");
+ if (w & INHIBIT_HANDLE_HIBERNATE_KEY)
+ p = stpcpy(p, "handle-hibernate-key:");
+ if (w & INHIBIT_HANDLE_LID_SWITCH)
+ p = stpcpy(p, "handle-lid-switch:");
+
+ if (p > buffer)
+ *(p-1) = 0;
+ else
+ *p = 0;
+
+ return buffer;
+}
+
+InhibitWhat inhibit_what_from_string(const char *s) {
+ InhibitWhat what = 0;
+ const char *word, *state;
+ size_t l;
+
+ FOREACH_WORD_SEPARATOR(word, l, s, ":", state) {
+ if (l == 8 && strneq(word, "shutdown", l))
+ what |= INHIBIT_SHUTDOWN;
+ else if (l == 5 && strneq(word, "sleep", l))
+ what |= INHIBIT_SLEEP;
+ else if (l == 4 && strneq(word, "idle", l))
+ what |= INHIBIT_IDLE;
+ else if (l == 16 && strneq(word, "handle-power-key", l))
+ what |= INHIBIT_HANDLE_POWER_KEY;
+ else if (l == 18 && strneq(word, "handle-suspend-key", l))
+ what |= INHIBIT_HANDLE_SUSPEND_KEY;
+ else if (l == 20 && strneq(word, "handle-hibernate-key", l))
+ what |= INHIBIT_HANDLE_HIBERNATE_KEY;
+ else if (l == 17 && strneq(word, "handle-lid-switch", l))
+ what |= INHIBIT_HANDLE_LID_SWITCH;
+ else
+ return _INHIBIT_WHAT_INVALID;
+ }
+
+ return what;
+}
+
+static const char* const inhibit_mode_table[_INHIBIT_MODE_MAX] = {
+ [INHIBIT_BLOCK] = "block",
+ [INHIBIT_DELAY] = "delay"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(inhibit_mode, InhibitMode);