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#define _POSIX_C_SOURCE 200809L
#include <errno.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/capability.h>
#include <linux/kd.h>
#include <linux/major.h>
#include <linux/vt.h>
#include <wayland-server.h>
#include <xf86drm.h>
#include <wlr/session/interface.h>
#include <wlr/util/log.h>
#ifndef KDSKBMUTE
#define KDSKBMUTE 0x4B51
#endif
enum { DRM_MAJOR = 226 };
const struct session_impl session_direct;
struct direct_session {
struct wlr_session base;
int tty_fd;
int drm_fd;
int kb_mode;
struct wl_event_source *vt_source;
};
static int direct_session_open(struct wlr_session *restrict base,
const char *restrict path) {
struct direct_session *session = wl_container_of(base, session, base);
int fd = open(path, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
if (fd == -1) {
wlr_log_errno(L_ERROR, "%s", path);
return -errno;
}
struct stat st;
if (fstat(fd, &st) == 0 && major(st.st_rdev) == DRM_MAJOR) {
session->drm_fd = fd;
drmSetMaster(fd);
}
return fd;
}
static void direct_session_close(struct wlr_session *base, int fd) {
struct direct_session *session = wl_container_of(base, session, base);
if (fd == session->drm_fd) {
drmDropMaster(fd);
session->drm_fd = -1;
}
close(fd);
}
static bool direct_change_vt(struct wlr_session *base, int vt) {
struct direct_session *session = wl_container_of(base, session, base);
return ioctl(session->tty_fd, VT_ACTIVATE, vt) == 0;
}
static void direct_session_finish(struct wlr_session *base) {
struct direct_session *session = wl_container_of(base, session, base);
struct vt_mode mode = {
.mode = VT_AUTO,
};
if (ioctl(session->tty_fd, KDSKBMUTE, 0)) {
ioctl(session->tty_fd, KDSKBMODE, session->kb_mode);
}
ioctl(session->tty_fd, KDSETMODE, KD_TEXT);
ioctl(session->tty_fd, VT_SETMODE, &mode);
wl_event_source_remove(session->vt_source);
close(session->tty_fd);
free(session);
}
static int vt_handler(int signo, void *data) {
struct direct_session *session = data;
if (session->base.active) {
session->base.active = false;
wl_signal_emit(&session->base.session_signal, session);
drmDropMaster(session->drm_fd);
ioctl(session->tty_fd, VT_RELDISP, 1);
} else {
ioctl(session->tty_fd, VT_RELDISP, VT_ACKACQ);
drmSetMaster(session->drm_fd);
session->base.active = true;
wl_signal_emit(&session->base.session_signal, session);
}
return 1;
}
static bool setup_tty(struct direct_session *session, struct wl_display *display) {
session->tty_fd = dup(STDIN_FILENO);
struct stat st;
if (fstat(session->tty_fd, &st) == -1 || major(st.st_rdev) != TTY_MAJOR ||
minor(st.st_rdev) == 0) {
wlr_log(L_ERROR, "Not running from a virtual terminal");
goto error;
}
int ret;
int kd_mode;
ret = ioctl(session->tty_fd, KDGETMODE, &kd_mode);
if (ret) {
wlr_log_errno(L_ERROR, "Failed to get tty mode");
goto error;
}
if (kd_mode != KD_TEXT) {
wlr_log(L_ERROR,
"tty already in graphics mode; is another display server running?");
goto error;
}
ioctl(session->tty_fd, VT_ACTIVATE, minor(st.st_rdev));
ioctl(session->tty_fd, VT_WAITACTIVE, minor(st.st_rdev));
if (ioctl(session->tty_fd, KDGKBMODE, &session->kb_mode)) {
wlr_log_errno(L_ERROR, "Failed to read keyboard mode");
goto error;
}
if (ioctl(session->tty_fd, KDSKBMUTE, 1) &&
ioctl(session->tty_fd, KDSKBMODE, K_OFF)) {
wlr_log_errno(L_ERROR, "Failed to set keyboard mode");
goto error;
}
if (ioctl(session->tty_fd, KDSETMODE, KD_GRAPHICS)) {
wlr_log_errno(L_ERROR, "Failed to get graphics mode on tty");
goto error;
}
struct vt_mode mode = {
.mode = VT_PROCESS,
.relsig = SIGUSR1,
.acqsig = SIGUSR1,
};
if (ioctl(session->tty_fd, VT_SETMODE, &mode) < 0) {
wlr_log(L_ERROR, "Failed to take control of tty");
goto error;
}
struct wl_event_loop *loop = wl_display_get_event_loop(display);
session->vt_source = wl_event_loop_add_signal(loop, SIGUSR1,
vt_handler, session);
if (!session->vt_source) {
goto error;
}
return true;
error:
close(session->tty_fd);
return false;
}
static struct wlr_session *direct_session_start(struct wl_display *disp) {
struct direct_session *session = calloc(1, sizeof(*session));
if (!session) {
wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
return NULL;
}
cap_t cap = cap_get_proc();
cap_flag_value_t val;
if (!cap || cap_get_flag(cap, CAP_SYS_ADMIN, CAP_PERMITTED, &val) || val != CAP_SET) {
wlr_log(L_ERROR, "Do not have CAP_SYS_ADMIN; cannot become DRM master");
cap_free(cap);
goto error_session;
}
cap_free(cap);
if (!setup_tty(session, disp)) {
goto error_session;
}
wlr_log(L_INFO, "Successfully loaded direct session");
session->base.impl = &session_direct;
session->base.active = true;
wl_signal_init(&session->base.session_signal);
return &session->base;
error_session:
free(session);
return NULL;
}
const struct session_impl session_direct = {
.start = direct_session_start,
.finish = direct_session_finish,
.open = direct_session_open,
.close = direct_session_close,
.change_vt = direct_change_vt,
};
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