#include <errno.h>

#include <fcntl.h>

#include <string.h>

#include <unistd.h>

#include "util.h"

#include "mkdir.h"

#include "path-util.h"

#include "logind-inhibit.h"

#include "fileio.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 finish;

r = fopen_temporary(i->state_file, &f, &temp_path);

if (r < 0)

goto finish;

fchmod(fileno(f), 0644);

fprintf(f,

"# This is private data. Do not parse.\n"

"WHAT=%s\n"

"MODE=%s\n"

"UID=%lu\n"

"PID=%lu\n",

inhibit_what_to_string(i->what),

inhibit_mode_to_string(i->mode),

(unsigned long) i->uid,

(unsigned long) i->pid);

if (i->who) {

_cleanup_free_ char *cc = NULL;

cc = cescape(i->who);

if (!cc)

r = -ENOMEM;

else

fprintf(f, "WHO=%s\n", cc);

}

if (i->why) {

_cleanup_free_ char *cc = NULL;

cc = cescape(i->why);

if (!cc)

r = -ENOMEM;

else

fprintf(f, "WHY=%s\n", cc);

}

if (i->fifo_path)

fprintf(f, "FIFO=%s\n", i->fifo_path);

fflush(f);

if (ferror(f) || rename(temp_path, i->state_file) < 0) {

r = -errno;

unlink(i->state_file);

unlink(temp_path);

}

finish:

if (r < 0)

log_error("Failed to save inhibit data for %s: %s", i->id, strerror(-r));

return r;

}

int inhibitor_start(Inhibitor *i) {

assert(i);

if (i->started)

return 0;

dual_timestamp_get(&i->since);

log_debug("Inhibitor %s (%s) pid=%lu uid=%lu mode=%s started.",

strna(i->who), strna(i->why),

(unsigned long) i->pid, (unsigned long) 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=%lu uid=%lu mode=%s stopped.",

strna(i->who), strna(i->why),

(unsigned long) i->pid, (unsigned long) 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) {

cc = cunescape(who);

if (!cc)

return -ENOMEM;

free(i->who);

i->who = cc;

}

if (why) {

cc = cunescape(why);

if (!cc)

return -ENOMEM;

free(i->why);

i->why = cc;

}

if (i->fifo_path) {

int fd;

fd = inhibitor_create_fifo(i);

if (fd >= 0)

close_nointr_nofail(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->fifo_fd, 0, inhibitor_dispatch_fifo, i, &i->event_source);

if (r < 0)

return r;

r = sd_event_source_set_priority(i->event_source, SD_EVENT_PRIORITY_IDLE);

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);

if (i->event_source)

i->event_source = sd_event_source_unref(i->event_source);

if (i->fifo_fd >= 0) {

close_nointr_nofail(i->fifo_fd);

i->fifo_fd = -1;

}

if (i->fifo_path) {

unlink(i->fifo_path);

free(i->fifo_path);

i->fifo_path = NULL;

}

}

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

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 = { 0, 0 };

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;

char *w, *state;

size_t l;

FOREACH_WORD_SEPARATOR(w, l, s, ":", state) {

if (l == 8 && strneq(w, "shutdown", l))

what |= INHIBIT_SHUTDOWN;

else if (l == 5 && strneq(w, "sleep", l))

what |= INHIBIT_SLEEP;

else if (l == 4 && strneq(w, "idle", l))

what |= INHIBIT_IDLE;

else if (l == 16 && strneq(w, "handle-power-key", l))

what |= INHIBIT_HANDLE_POWER_KEY;

else if (l == 18 && strneq(w, "handle-suspend-key", l))

what |= INHIBIT_HANDLE_SUSPEND_KEY;

else if (l == 20 && strneq(w, "handle-hibernate-key", l))

what |= INHIBIT_HANDLE_HIBERNATE_KEY;

else if (l == 17 && strneq(w, "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);