wlroots/backend/session/logind.c

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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
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#include <errno.h>
#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
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#include <sys/sysmacros.h>
#include <unistd.h>
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#include <wayland-server.h>
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#include <wlr/backend/session/interface.h>
#include <wlr/config.h>
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#include <wlr/util/log.h>
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#include "util/signal.h"
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#ifdef WLR_HAS_SYSTEMD
#include <systemd/sd-bus.h>
#include <systemd/sd-login.h>
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#elif defined(WLR_HAS_ELOGIND)
#include <elogind/sd-bus.h>
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#include <elogind/sd-login.h>
#endif
enum { DRM_MAJOR = 226 };
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const struct session_impl session_logind;
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struct logind_session {
struct wlr_session base;
sd_bus *bus;
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struct wl_event_source *event;
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char *id;
char *path;
};
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static struct logind_session *logind_session_from_session(
struct wlr_session *base) {
assert(base->impl == &session_logind);
return (struct logind_session *)base;
}
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static int logind_take_device(struct wlr_session *base, const char *path) {
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struct logind_session *session = logind_session_from_session(base);
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int ret;
int fd = -1;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
struct stat st;
if (stat(path, &st) < 0) {
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wlr_log(WLR_ERROR, "Failed to stat '%s'", path);
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return -1;
}
ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
session->path, "org.freedesktop.login1.Session", "TakeDevice",
&error, &msg, "uu", major(st.st_rdev), minor(st.st_rdev));
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to take device '%s': %s", path, error.message);
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goto error;
}
int paused = 0;
ret = sd_bus_message_read(msg, "hb", &fd, &paused);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to parse D-Bus response for '%s': %s",
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path, strerror(-ret));
goto error;
}
// The original fd seems to be closed when the message is freed
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// so we just clone it.
fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
if (fd == -1) {
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wlr_log(WLR_ERROR, "Failed to clone file descriptor for '%s': %s",
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path, strerror(errno));
goto error;
}
error:
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
return fd;
}
static void logind_release_device(struct wlr_session *base, int fd) {
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struct logind_session *session = logind_session_from_session(base);
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int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
struct stat st;
if (fstat(fd, &st) < 0) {
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wlr_log(WLR_ERROR, "Failed to stat device '%d'", fd);
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return;
}
ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
session->path, "org.freedesktop.login1.Session", "ReleaseDevice",
&error, &msg, "uu", major(st.st_rdev), minor(st.st_rdev));
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to release device '%d'", fd);
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}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
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close(fd);
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}
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static bool logind_change_vt(struct wlr_session *base, unsigned vt) {
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struct logind_session *session = logind_session_from_session(base);
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// Only seat0 has VTs associated with it
if (strcmp(session->base.seat, "seat0") != 0) {
return true;
}
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int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
"/org/freedesktop/login1/seat/self", "org.freedesktop.login1.Seat", "SwitchTo",
&error, &msg, "u", (uint32_t)vt);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to change to vt '%d'", vt);
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}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
return ret >= 0;
}
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static bool find_session_path(struct logind_session *session) {
int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
"/org/freedesktop/login1", "org.freedesktop.login1.Manager",
"GetSession", &error, &msg, "s", session->id);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to get session path: %s", strerror(-ret));
goto out;
}
const char *path;
ret = sd_bus_message_read(msg, "o", &path);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Could not parse session path: %s", strerror(-ret));
goto out;
}
session->path = strdup(path);
out:
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
return ret >= 0;
}
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static bool session_activate(struct logind_session *session) {
int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
session->path, "org.freedesktop.login1.Session", "Activate",
&error, &msg, "");
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to activate session");
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}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
return ret >= 0;
}
static bool take_control(struct logind_session *session) {
int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
session->path, "org.freedesktop.login1.Session", "TakeControl",
&error, &msg, "b", false);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to take control of session");
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}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
return ret >= 0;
}
static void release_control(struct logind_session *session) {
int ret;
sd_bus_message *msg = NULL;
sd_bus_error error = SD_BUS_ERROR_NULL;
ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
session->path, "org.freedesktop.login1.Session", "ReleaseControl",
&error, &msg, "");
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to release control of session");
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}
sd_bus_error_free(&error);
sd_bus_message_unref(msg);
}
static void logind_session_destroy(struct wlr_session *base) {
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struct logind_session *session = logind_session_from_session(base);
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release_control(session);
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wl_event_source_remove(session->event);
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sd_bus_unref(session->bus);
free(session->id);
free(session->path);
free(session);
}
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static int session_removed(sd_bus_message *msg, void *userdata, sd_bus_error *ret_error) {
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wlr_log(WLR_INFO, "SessionRemoved signal received");
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return 0;
}
static struct wlr_device *find_device(struct wlr_session *session, dev_t devnum) {
struct wlr_device *dev;
wl_list_for_each(dev, &session->devices, link) {
if (dev->dev == devnum) {
return dev;
}
}
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wlr_log(WLR_ERROR, "Tried to use dev_t %lu not opened by session",
(unsigned long)devnum);
assert(0);
}
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static int pause_device(sd_bus_message *msg, void *userdata, sd_bus_error *ret_error) {
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struct logind_session *session = userdata;
int ret;
uint32_t major, minor;
const char *type;
ret = sd_bus_message_read(msg, "uus", &major, &minor, &type);
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to parse D-Bus response for PauseDevice: %s",
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strerror(-ret));
goto error;
}
if (major == DRM_MAJOR) {
session->base.active = false;
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wlr_signal_emit_safe(&session->base.session_signal, session);
}
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if (strcmp(type, "pause") == 0) {
ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
session->path, "org.freedesktop.login1.Session", "PauseDeviceComplete",
ret_error, &msg, "uu", major, minor);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to send PauseDeviceComplete signal: %s",
strerror(-ret));
}
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}
error:
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return 0;
}
static int resume_device(sd_bus_message *msg, void *userdata, sd_bus_error *ret_error) {
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struct logind_session *session = userdata;
int ret;
int fd;
uint32_t major, minor;
ret = sd_bus_message_read(msg, "uuh", &major, &minor, &fd);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to parse D-Bus response for ResumeDevice: %s",
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strerror(-ret));
goto error;
}
if (major == DRM_MAJOR) {
struct wlr_device *dev = find_device(&session->base, makedev(major, minor));
dup2(fd, dev->fd);
if (!session->base.active) {
session->base.active = true;
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wlr_signal_emit_safe(&session->base.session_signal, session);
}
}
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error:
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return 0;
}
static bool add_signal_matches(struct logind_session *session) {
int ret;
char str[256];
const char *fmt = "type='signal',"
"sender='org.freedesktop.login1',"
"interface='org.freedesktop.login1.%s',"
"member='%s',"
"path='%s'";
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snprintf(str, sizeof(str), fmt, "Manager", "SessionRemoved", "/org/freedesktop/login1");
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ret = sd_bus_add_match(session->bus, NULL, str, session_removed, session);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
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return false;
}
snprintf(str, sizeof(str), fmt, "Session", "PauseDevice", session->path);
ret = sd_bus_add_match(session->bus, NULL, str, pause_device, session);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
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return false;
}
snprintf(str, sizeof(str), fmt, "Session", "ResumeDevice", session->path);
ret = sd_bus_add_match(session->bus, NULL, str, resume_device, session);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
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return false;
}
return true;
}
static int dbus_event(int fd, uint32_t mask, void *data) {
sd_bus *bus = data;
while (sd_bus_process(bus, NULL) > 0) {
// Do nothing.
}
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return 1;
}
static struct wlr_session *logind_session_create(struct wl_display *disp) {
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int ret;
struct logind_session *session = calloc(1, sizeof(*session));
if (!session) {
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wlr_log(WLR_ERROR, "Allocation failed: %s", strerror(errno));
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return NULL;
}
ret = sd_pid_get_session(getpid(), &session->id);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to get session id: %s", strerror(-ret));
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goto error;
}
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char *seat;
ret = sd_session_get_seat(session->id, &seat);
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to get seat id: %s", strerror(-ret));
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goto error;
}
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snprintf(session->base.seat, sizeof(session->base.seat), "%s", seat);
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if (strcmp(seat, "seat0") == 0) {
ret = sd_session_get_vt(session->id, &session->base.vtnr);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Session not running in virtual terminal");
goto error;
}
}
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free(seat);
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ret = sd_bus_default_system(&session->bus);
if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to open D-Bus connection: %s", strerror(-ret));
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goto error;
}
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if (!find_session_path(session)) {
sd_bus_unref(session->bus);
goto error;
}
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if (!add_signal_matches(session)) {
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goto error_bus;
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}
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struct wl_event_loop *event_loop = wl_display_get_event_loop(disp);
session->event = wl_event_loop_add_fd(event_loop, sd_bus_get_fd(session->bus),
WL_EVENT_READABLE, dbus_event, session->bus);
if (!session_activate(session)) {
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goto error_bus;
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}
if (!take_control(session)) {
goto error_bus;
}
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wlr_log(WLR_INFO, "Successfully loaded logind session");
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session->base.impl = &session_logind;
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return &session->base;
error_bus:
sd_bus_unref(session->bus);
free(session->path);
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error:
free(session->id);
return NULL;
}
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const struct session_impl session_logind = {
.create = logind_session_create,
.destroy = logind_session_destroy,
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.open = logind_take_device,
.close = logind_release_device,
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.change_vt = logind_change_vt,
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};