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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <inttypes.h>
#include <time.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <termios.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include "config.h"
#ifdef HAVE_SYSTEMD
# include <systemd/sd-bus.h>
#endif
#include "logind.h"
#ifdef HAVE_SYSTEMD
/* ---------------------------------------------------------------------- */
static int logind_debug = 0;
static sd_bus *logind_dbus = NULL;
/* ---------------------------------------------------------------------- */
static int logind_take_control(void)
{
sd_bus_error error = SD_BUS_ERROR_NULL;
sd_bus_message *m = NULL;
int r;
if (!logind_dbus)
return -1;
if (logind_debug)
fprintf(stderr, "call : TakeControl()\n");
r = sd_bus_call_method(logind_dbus,
"org.freedesktop.login1",
"/org/freedesktop/login1/session/self",
"org.freedesktop.login1.Session",
"TakeControl",
&error,
&m,
"b",
false);
if (r < 0) {
fprintf(stderr, "error : TakeControl failed: %s\n",
error.message);
sd_bus_error_free(&error);
}
sd_bus_message_unref(m);
return r;
}
static int logind_release_control(void)
{
sd_bus_error error = SD_BUS_ERROR_NULL;
sd_bus_message *m = NULL;
int r;
if (!logind_dbus)
return -1;
if (logind_debug)
fprintf(stderr, "call : ReleaseControl()\n");
r = sd_bus_call_method(logind_dbus,
"org.freedesktop.login1",
"/org/freedesktop/login1/session/self",
"org.freedesktop.login1.Session",
"ReleaseControl",
&error,
&m,
"");
if (r < 0) {
fprintf(stderr, "error : ReleaseControl failed: %s\n",
error.message);
sd_bus_error_free(&error);
}
sd_bus_message_unref(m);
return r;
}
/* ---------------------------------------------------------------------- */
void logind_init(void)
{
const char *session_id, *seat;
int r;
if (logind_dbus)
return;
seat = getenv("XDG_SEAT");
session_id = getenv("XDG_SESSION_ID");
if (!seat || !session_id)
return;
r = sd_bus_open_system(&logind_dbus);
if (r < 0) {
fprintf(stderr, "Failed to connect to system bus: %s\n", strerror(-r));
return;
}
r = logind_take_control();
if (r < 0)
goto err;
return;
err:
sd_bus_unref(logind_dbus);
logind_dbus = NULL;
}
void logind_fini(void)
{
if (!logind_dbus)
return;
logind_release_control();
sd_bus_unref(logind_dbus);
logind_dbus = NULL;
}
int logind_open(const char *path)
{
sd_bus_error error = SD_BUS_ERROR_NULL;
sd_bus_message *m = NULL;
struct stat st;
unsigned int maj, min;
int inactive;
int handle, fd, r;
if (!logind_dbus)
return -1;
r = stat(path, &st);
if (r < 0) {
fprintf(stderr, "stat %s failed: %s\n", path, strerror(errno));
return -1;
}
maj = major(st.st_rdev);
min = minor(st.st_rdev);
if (logind_debug)
fprintf(stderr, "call : TakeDevice(%d,%d)\n", maj, min);
r = sd_bus_call_method(logind_dbus,
"org.freedesktop.login1",
"/org/freedesktop/login1/session/self",
"org.freedesktop.login1.Session",
"TakeDevice",
&error,
&m,
"uu",
maj,
min);
if (r < 0) {
fprintf(stderr, "error : TakeDevice failed: %s\n",
error.message);
sd_bus_error_free(&error);
return -1;
}
handle = -1;
inactive = -1;
r = sd_bus_message_read(m, "hb", &handle, &inactive);
if (r < 0) {
fd = -1;
fprintf(stderr, "error : Parsing TakeDevice reply failed: %s\n",
strerror(-r));
} else {
fd = fcntl(handle, F_DUPFD_CLOEXEC, 0);
fprintf(stderr, "open %s: got fd %d via logind.\n",
path, fd);
}
sd_bus_message_unref(m);
return fd;
}
#else
/* ---------------------------------------------------------------------- */
void logind_init(void)
{
}
void logind_fini(void)
{
}
int logind_open(const char *path)
{
fprintf(stderr, "%s(%s): compiled without logind support.\n",
__func__, path);
return -1;
}
#endif
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