Kenny Levinsen
4 years ago
committed by
Simon Ser
parent
9f012cac2f
commit
d50bbf0bbc
@ -1,728 +0,0 @@
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#define _POSIX_C_SOURCE 200809L
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include <unistd.h>
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#include <wayland-server-core.h>
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#include <wlr/backend/session/interface.h>
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#include <wlr/config.h>
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#include <wlr/util/log.h>
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#include "backend/session/session.h"
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#include "util/signal.h"
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#if WLR_HAS_SYSTEMD
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#include <systemd/sd-bus.h>
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#include <systemd/sd-login.h>
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#elif WLR_HAS_ELOGIND
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#include <elogind/sd-bus.h>
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#include <elogind/sd-login.h>
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#endif
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enum { DRM_MAJOR = 226 };
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const struct session_impl session_logind;
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struct logind_session {
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struct wlr_session base;
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sd_bus *bus;
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struct wl_event_source *event;
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char *id;
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char *path;
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// specifies whether a drm device was taken
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// if so, the session will be (de)activated with the drm fd,
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// otherwise with the dbus PropertiesChanged on "active" signal
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bool has_drm;
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};
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static struct logind_session *logind_session_from_session(
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struct wlr_session *base) {
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assert(base->impl == &session_logind);
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return (struct logind_session *)base;
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}
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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 fd = -1;
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int ret;
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sd_bus_message *msg = NULL;
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sd_bus_error error = SD_BUS_ERROR_NULL;
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struct stat st;
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if (stat(path, &st) < 0) {
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wlr_log(WLR_ERROR, "Failed to stat '%s'", path);
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return -1;
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}
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if (major(st.st_rdev) == DRM_MAJOR) {
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session->has_drm = true;
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}
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ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
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session->path, "org.freedesktop.login1.Session", "TakeDevice",
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&error, &msg, "uu", major(st.st_rdev), minor(st.st_rdev));
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to take device '%s': %s", path,
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error.message);
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goto out;
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}
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int paused = 0;
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ret = sd_bus_message_read(msg, "hb", &fd, &paused);
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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));
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goto out;
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}
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// The original fd seems to be closed when the message is freed
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// so we just clone it.
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fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
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if (fd < 0) {
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wlr_log(WLR_ERROR, "Failed to clone file descriptor for '%s': %s",
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path, strerror(errno));
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goto out;
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}
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out:
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sd_bus_error_free(&error);
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sd_bus_message_unref(msg);
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return fd;
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}
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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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struct stat st;
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if (fstat(fd, &st) < 0) {
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wlr_log(WLR_ERROR, "Failed to stat device '%d': %s", fd,
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strerror(errno));
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close(fd);
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return;
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}
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close(fd);
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sd_bus_message *msg = NULL;
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sd_bus_error error = SD_BUS_ERROR_NULL;
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int ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
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session->path, "org.freedesktop.login1.Session", "ReleaseDevice",
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&error, &msg, "uu", major(st.st_rdev), minor(st.st_rdev));
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to release device '%d': %s", fd,
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error.message);
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}
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sd_bus_error_free(&error);
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sd_bus_message_unref(msg);
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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 if seat has VTs associated with it
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if (!sd_seat_can_tty(session->base.seat)) {
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return true;
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}
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int ret;
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sd_bus_message *msg = NULL;
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sd_bus_error error = SD_BUS_ERROR_NULL;
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ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
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"/org/freedesktop/login1/seat/seat0", "org.freedesktop.login1.Seat", "SwitchTo",
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&error, &msg, "u", (uint32_t)vt);
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to change to vt '%u'", vt);
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}
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sd_bus_error_free(&error);
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sd_bus_message_unref(msg);
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return ret >= 0;
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}
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static bool find_session_path(struct logind_session *session) {
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int ret;
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sd_bus_message *msg = NULL;
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sd_bus_error error = SD_BUS_ERROR_NULL;
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ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
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"/org/freedesktop/login1", "org.freedesktop.login1.Manager",
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"GetSession", &error, &msg, "s", session->id);
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to get session path: %s", error.message);
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goto out;
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}
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const char *path;
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ret = sd_bus_message_read(msg, "o", &path);
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Could not parse session path: %s", error.message);
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goto out;
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}
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session->path = strdup(path);
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out:
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sd_bus_error_free(&error);
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sd_bus_message_unref(msg);
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return ret >= 0;
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}
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static bool session_activate(struct logind_session *session) {
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int ret;
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sd_bus_message *msg = NULL;
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sd_bus_error error = SD_BUS_ERROR_NULL;
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ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
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session->path, "org.freedesktop.login1.Session", "Activate",
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&error, &msg, "");
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to activate session: %s", error.message);
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}
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sd_bus_error_free(&error);
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sd_bus_message_unref(msg);
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return ret >= 0;
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}
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static bool take_control(struct logind_session *session) {
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int ret;
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sd_bus_message *msg = NULL;
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sd_bus_error error = SD_BUS_ERROR_NULL;
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ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
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session->path, "org.freedesktop.login1.Session", "TakeControl",
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&error, &msg, "b", false);
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to take control of session: %s",
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error.message);
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}
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sd_bus_error_free(&error);
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sd_bus_message_unref(msg);
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return ret >= 0;
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}
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static void set_type(struct logind_session *session) {
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int ret;
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sd_bus_message *msg = NULL;
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sd_bus_error error = SD_BUS_ERROR_NULL;
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ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
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session->path, "org.freedesktop.login1.Session", "SetType",
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&error, &msg, "s", "wayland");
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if (ret < 0) {
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wlr_log(WLR_DEBUG, "Failed to set logind session type for session: %s",
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error.message);
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}
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sd_bus_error_free(&error);
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sd_bus_message_unref(msg);
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if (ret < 0) {
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return;
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}
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ret = setenv("XDG_SESSION_TYPE", "wayland", 1);
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to set XDG_SESSION_TYPE for session");
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}
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}
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static void release_control(struct logind_session *session) {
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int ret;
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sd_bus_message *msg = NULL;
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sd_bus_error error = SD_BUS_ERROR_NULL;
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ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
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session->path, "org.freedesktop.login1.Session", "ReleaseControl",
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&error, &msg, "");
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to release control of session: %s",
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error.message);
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}
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sd_bus_error_free(&error);
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sd_bus_message_unref(msg);
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}
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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);
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free(session->id);
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free(session->path);
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free(session);
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}
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static int session_removed(sd_bus_message *msg, void *userdata,
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sd_bus_error *ret_error) {
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wlr_log(WLR_INFO, "SessionRemoved signal received");
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return 0;
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}
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static struct wlr_device *find_device(struct wlr_session *session,
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dev_t devnum) {
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struct wlr_device *dev;
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wl_list_for_each(dev, &session->devices, link) {
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if (dev->dev == devnum) {
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return dev;
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}
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}
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wlr_log(WLR_ERROR, "Tried to use dev_t %lu not opened by session",
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(unsigned long)devnum);
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assert(0);
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return NULL;
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}
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static int pause_device(sd_bus_message *msg, void *userdata,
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sd_bus_error *ret_error) {
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struct logind_session *session = userdata;
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int ret;
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uint32_t major, minor;
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const char *type;
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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));
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goto error;
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}
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if (major == DRM_MAJOR && strcmp(type, "gone") != 0) {
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assert(session->has_drm);
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session->base.active = false;
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wlr_signal_emit_safe(&session->base.events.active, NULL);
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}
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if (strcmp(type, "pause") == 0) {
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ret = sd_bus_call_method(session->bus, "org.freedesktop.login1",
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session->path, "org.freedesktop.login1.Session", "PauseDeviceComplete",
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ret_error, &msg, "uu", major, minor);
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to send PauseDeviceComplete signal: %s",
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strerror(-ret));
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}
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}
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error:
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return 0;
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}
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static int resume_device(sd_bus_message *msg, void *userdata,
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sd_bus_error *ret_error) {
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struct logind_session *session = userdata;
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int ret;
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int fd;
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uint32_t major, minor;
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ret = sd_bus_message_read(msg, "uuh", &major, &minor, &fd);
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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));
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goto error;
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}
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if (major == DRM_MAJOR) {
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struct wlr_device *dev = find_device(&session->base, makedev(major, minor));
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close(dev->fd);
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if (fcntl(fd, F_DUPFD_CLOEXEC, dev->fd) < 0) {
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wlr_log_errno(WLR_ERROR, "Failed to duplicate file descriptor");
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goto error;
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}
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if (!session->base.active) {
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session->base.active = true;
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wlr_signal_emit_safe(&session->base.events.active, NULL);
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}
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}
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error:
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return 0;
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}
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static int session_properties_changed(sd_bus_message *msg, void *userdata,
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sd_bus_error *ret_error) {
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struct logind_session *session = userdata;
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int ret = 0;
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// if we have a drm fd we don't depend on this
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if (session->has_drm) {
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return 0;
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}
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// PropertiesChanged arg 1: interface
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const char *interface;
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ret = sd_bus_message_read_basic(msg, 's', &interface); // skip path
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if (ret < 0) {
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goto error;
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}
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if (strcmp(interface, "org.freedesktop.login1.Session") != 0) {
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// not interesting for us; ignore
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wlr_log(WLR_DEBUG, "ignoring PropertiesChanged from %s", interface);
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return 0;
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}
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// PropertiesChanged arg 2: changed properties with values
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ret = sd_bus_message_enter_container(msg, 'a', "{sv}");
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if (ret < 0) {
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goto error;
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}
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const char *s;
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while ((ret = sd_bus_message_enter_container(msg, 'e', "sv")) > 0) {
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ret = sd_bus_message_read_basic(msg, 's', &s);
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if (ret < 0) {
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goto error;
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}
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if (strcmp(s, "Active") == 0) {
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int ret;
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ret = sd_bus_message_enter_container(msg, 'v', "b");
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if (ret < 0) {
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goto error;
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}
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bool active;
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ret = sd_bus_message_read_basic(msg, 'b', &active);
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if (ret < 0) {
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goto error;
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}
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if (session->base.active != active) {
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session->base.active = active;
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wlr_signal_emit_safe(&session->base.events.active, NULL);
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}
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return 0;
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} else {
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sd_bus_message_skip(msg, "{sv}");
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}
|
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|
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ret = sd_bus_message_exit_container(msg);
|
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if (ret < 0) {
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goto error;
|
||||
}
|
||||
}
|
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|
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if (ret < 0) {
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goto error;
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}
|
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ret = sd_bus_message_exit_container(msg);
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if (ret < 0) {
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goto error;
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}
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|
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// PropertiesChanged arg 3: changed properties without values
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sd_bus_message_enter_container(msg, 'a', "s");
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while ((ret = sd_bus_message_read_basic(msg, 's', &s)) > 0) {
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if (strcmp(s, "Active") == 0) {
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sd_bus_error error = SD_BUS_ERROR_NULL;
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bool active;
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ret = sd_bus_get_property_trivial(session->bus,
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"org.freedesktop.login1", session->path,
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"org.freedesktop.login1.Session", "Active", &error,
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'b', &active);
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if (ret < 0) {
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wlr_log(WLR_ERROR, "Failed to get 'Active' property: %s",
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error.message);
|
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return 0;
|
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}
|
||||
|
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if (session->base.active != active) {
|
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session->base.active = active;
|
||||
wlr_signal_emit_safe(&session->base.events.active, NULL);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
}
|
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|
||||
if (ret < 0) {
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goto error;
|
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}
|
||||
|
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return 0;
|
||||
|
||||
error:
|
||||
wlr_log(WLR_ERROR, "Failed to parse D-Bus PropertiesChanged: %s",
|
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strerror(-ret));
|
||||
return 0;
|
||||
}
|
||||
|
||||
static bool add_signal_matches(struct logind_session *session) {
|
||||
static const char *logind = "org.freedesktop.login1";
|
||||
static const char *logind_path = "/org/freedesktop/login1";
|
||||
static const char *manager_interface = "org.freedesktop.login1.Manager";
|
||||
static const char *session_interface = "org.freedesktop.login1.Session";
|
||||
static const char *property_interface = "org.freedesktop.DBus.Properties";
|
||||
int ret;
|
||||
|
||||
ret = sd_bus_match_signal(session->bus, NULL, logind, logind_path,
|
||||
manager_interface, "SessionRemoved", session_removed, session);
|
||||
if (ret < 0) {
|
||||
wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
|
||||
return false;
|
||||
}
|
||||
|
||||
ret = sd_bus_match_signal(session->bus, NULL, logind, session->path,
|
||||
session_interface, "PauseDevice", pause_device, session);
|
||||
if (ret < 0) {
|
||||
wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
|
||||
return false;
|
||||
}
|
||||
|
||||
ret = sd_bus_match_signal(session->bus, NULL, logind, session->path,
|
||||
session_interface, "ResumeDevice", resume_device, session);
|
||||
if (ret < 0) {
|
||||
wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
|
||||
return false;
|
||||
}
|
||||
|
||||
ret = sd_bus_match_signal(session->bus, NULL, logind, session->path,
|
||||
property_interface, "PropertiesChanged",
|
||||
session_properties_changed, session);
|
||||
if (ret < 0) {
|
||||
wlr_log(WLR_ERROR, "Failed to add D-Bus match: %s", strerror(-ret));
|
||||
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.
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
static bool contains_str(const char *needle, const char **haystack) {
|
||||
for (int i = 0; haystack[i]; i++) {
|
||||
if (strcmp(haystack[i], needle) == 0) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static bool get_greeter_session(char **session_id) {
|
||||
char *class = NULL;
|
||||
char **user_sessions = NULL;
|
||||
int user_session_count = sd_uid_get_sessions(getuid(), 1, &user_sessions);
|
||||
|
||||
if (user_session_count < 0) {
|
||||
wlr_log(WLR_ERROR, "Failed to get sessions");
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (user_session_count == 0) {
|
||||
wlr_log(WLR_ERROR, "User has no sessions");
|
||||
goto out;
|
||||
}
|
||||
|
||||
for (int i = 0; i < user_session_count; ++i) {
|
||||
int ret = sd_session_get_class(user_sessions[i], &class);
|
||||
if (ret < 0) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (strcmp(class, "greeter") == 0) {
|
||||
*session_id = strdup(user_sessions[i]);
|
||||
goto out;
|
||||
}
|
||||
}
|
||||
|
||||
out:
|
||||
free(class);
|
||||
for (int i = 0; i < user_session_count; ++i) {
|
||||
free(user_sessions[i]);
|
||||
}
|
||||
free(user_sessions);
|
||||
|
||||
return *session_id != NULL;
|
||||
}
|
||||
|
||||
static bool get_display_session(char **session_id) {
|
||||
assert(session_id != NULL);
|
||||
int ret;
|
||||
|
||||
char *type = NULL;
|
||||
char *state = NULL;
|
||||
char *xdg_session_id = getenv("XDG_SESSION_ID");
|
||||
|
||||
if (xdg_session_id) {
|
||||
wlr_log(WLR_INFO, "Selecting session from XDG_SESSION_ID: %s", xdg_session_id);
|
||||
|
||||
// This just checks whether the supplied session ID is valid
|
||||
if (sd_session_is_active(xdg_session_id) < 0) {
|
||||
wlr_log(WLR_ERROR, "Invalid XDG_SESSION_ID: '%s'", xdg_session_id);
|
||||
goto error;
|
||||
}
|
||||
*session_id = strdup(xdg_session_id);
|
||||
return true;
|
||||
}
|
||||
|
||||
// If there's a session active for the current process then just use that
|
||||
ret = sd_pid_get_session(getpid(), session_id);
|
||||
if (ret == 0) {
|
||||
return true;
|
||||
}
|
||||
|
||||
// Find any active sessions for the user if the process isn't part of an
|
||||
// active session itself
|
||||
ret = sd_uid_get_display(getuid(), session_id);
|
||||
if (ret < 0 && ret != -ENODATA) {
|
||||
wlr_log(WLR_ERROR, "Failed to get display: %s", strerror(-ret));
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (ret != 0 && !get_greeter_session(session_id)) {
|
||||
wlr_log(WLR_ERROR, "Couldn't find an active session or a greeter session");
|
||||
goto error;
|
||||
}
|
||||
|
||||
assert(*session_id != NULL);
|
||||
|
||||
// Check that the available session is graphical
|
||||
ret = sd_session_get_type(*session_id, &type);
|
||||
if (ret < 0) {
|
||||
wlr_log(WLR_ERROR, "Couldn't get a type for session '%s': %s",
|
||||
*session_id, strerror(-ret));
|
||||
goto error;
|
||||
}
|
||||
|
||||
const char *graphical_session_types[] = {"wayland", "x11", "mir", NULL};
|
||||
if (!contains_str(type, graphical_session_types)) {
|
||||
wlr_log(WLR_ERROR, "Session '%s' isn't a graphical session (type: '%s')",
|
||||
*session_id, type);
|
||||
goto error;
|
||||
}
|
||||
|
||||
// Check that the session is active
|
||||
ret = sd_session_get_state(*session_id, &state);
|
||||
if (ret < 0) {
|
||||
wlr_log(WLR_ERROR, "Couldn't get state for session '%s': %s",
|
||||
*session_id, strerror(-ret));
|
||||
goto error;
|
||||
}
|
||||
|
||||
const char *active_states[] = {"active", "online", NULL};
|
||||
if (!contains_str(state, active_states)) {
|
||||
wlr_log(WLR_ERROR, "Session '%s' is not active", *session_id);
|
||||
goto error;
|
||||
}
|
||||
|
||||
free(type);
|
||||
free(state);
|
||||
return true;
|
||||
|
||||
error:
|
||||
free(type);
|
||||
free(state);
|
||||
free(*session_id);
|
||||
*session_id = NULL;
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static struct wlr_session *logind_session_create(struct wl_display *disp) {
|
||||
int ret;
|
||||
struct logind_session *session = calloc(1, sizeof(*session));
|
||||
if (!session) {
|
||||
wlr_log(WLR_ERROR, "Allocation failed: %s", strerror(errno));
|
||||
return NULL;
|
||||
}
|
||||
|
||||
session_init(&session->base);
|
||||
|
||||
if (!get_display_session(&session->id)) {
|
||||
goto error;
|
||||
}
|
||||
|
||||
char *seat;
|
||||
ret = sd_session_get_seat(session->id, &seat);
|
||||
if (ret < 0) {
|
||||
wlr_log(WLR_ERROR, "Failed to get seat id: %s", strerror(-ret));
|
||||
goto error;
|
||||
}
|
||||
snprintf(session->base.seat, sizeof(session->base.seat), "%s", seat);
|
||||
|
||||
if (sd_seat_can_tty(seat)) {
|
||||
ret = sd_session_get_vt(session->id, &session->base.vtnr);
|
||||
if (ret < 0) {
|
||||
wlr_log(WLR_ERROR, "Session not running in virtual terminal");
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
free(seat);
|
||||
|
||||
ret = sd_bus_default_system(&session->bus);
|
||||
if (ret < 0) {
|
||||
wlr_log(WLR_ERROR, "Failed to open D-Bus connection: %s", strerror(-ret));
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (!find_session_path(session)) {
|
||||
sd_bus_unref(session->bus);
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (!add_signal_matches(session)) {
|
||||
goto error_bus;
|
||||
}
|
||||
|
||||
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)) {
|
||||
goto error_bus;
|
||||
}
|
||||
|
||||
if (!take_control(session)) {
|
||||
goto error_bus;
|
||||
}
|
||||
|
||||
set_type(session);
|
||||
|
||||
wlr_log(WLR_INFO, "Successfully loaded logind session");
|
||||
|
||||
session->base.impl = &session_logind;
|
||||
session->base.active = true;
|
||||
|
||||
return &session->base;
|
||||
|
||||
error_bus:
|
||||
sd_bus_unref(session->bus);
|
||||
free(session->path);
|
||||
|
||||
error:
|
||||
free(session->id);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
const struct session_impl session_logind = {
|
||||
.create = logind_session_create,
|
||||
.destroy = logind_session_destroy,
|
||||
.open = logind_take_device,
|
||||
.close = logind_release_device,
|
||||
.change_vt = logind_change_vt,
|
||||
};
|
||||
Loading…
Reference in new issue