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extern crate x11rb;
use std::fs::{remove_file, File, OpenOptions};
use std::io::{Result as IOResult, Write};
use std::os::unix::io::AsRawFd;
use std::ptr::null_mut;
use libc::{mmap, MAP_FAILED, MAP_SHARED, PROT_READ, PROT_WRITE};
use rustix::fd::OwnedFd;
use x11rb::connection::Connection;
use x11rb::errors::{ConnectionError, ReplyError, ReplyOrIdError};
use x11rb::protocol::shm::{self, ConnectionExt as _};
use x11rb::protocol::xproto::{self, ImageFormat, PixmapWrapper};
const TEMP_FILE_CONTENT: [u8; 8] = [0x00, 0x01, 0x02, 0x03, 0xff, 0xfe, 0xfd, 0xfc];
/// Get the supported SHM version from the X11 server
fn check_shm_version<C: Connection>(conn: &C) -> Result<Option<(u16, u16)>, ReplyError> {
if conn
.extension_information(shm::X11_EXTENSION_NAME)?
.is_none()
{
return Ok(None);
}
let shm_version = conn.shm_query_version()?.reply()?;
Ok(Some((shm_version.major_version, shm_version.minor_version)))
}
/// Get the bytes describing the first pixel at the given offset of the given shared memory segment
/// (interpreted in the screen's root_visual)
fn get_shared_memory_content_at_offset<C: Connection>(
conn: &C,
screen: &xproto::Screen,
shmseg: shm::Seg,
offset: u32,
) -> Result<Vec<u8>, ReplyOrIdError> {
let width = match screen.root_depth {
24 => 1,
16 => 2,
8 => 4,
_ => panic!("I do not know how to handle depth {}", screen.root_depth),
};
let pixmap = conn.generate_id()?;
conn.shm_create_pixmap(
pixmap,
screen.root,
width,
1,
screen.root_depth,
shmseg,
offset,
)?;
let pixmap = PixmapWrapper::for_pixmap(conn, pixmap);
let image = xproto::get_image(
conn,
ImageFormat::Z_PIXMAP,
pixmap.pixmap(),
0,
0,
width,
1,
!0,
)?
.reply()?;
Ok(image.data)
}
fn use_shared_mem<C: Connection>(
conn: &C,
screen_num: usize,
shmseg: shm::Seg,
) -> Result<(), ReplyOrIdError> {
let screen = &conn.setup().roots[screen_num];
let content = get_shared_memory_content_at_offset(conn, screen, shmseg, 0)?;
assert_eq!(content[..], TEMP_FILE_CONTENT[0..4]);
let content = get_shared_memory_content_at_offset(conn, screen, shmseg, 4)?;
assert_eq!(content[..], TEMP_FILE_CONTENT[4..8]);
Ok(())
}
/// Make a temporary file
fn make_file() -> IOResult<File> {
let file_name = "shared_memory.bin";
let mut file = OpenOptions::new()
.create(true)
.read(true)
.write(true)
.truncate(true)
.open(file_name)?;
file.write_all(&TEMP_FILE_CONTENT)?;
remove_file(file_name)?;
Ok(file)
}
fn send_fd<C: Connection>(conn: &C, screen_num: usize, file: File) -> Result<(), ReplyOrIdError> {
let shmseg = conn.generate_id()?;
conn.shm_attach_fd(shmseg, OwnedFd::from(file), false)?;
use_shared_mem(conn, screen_num, shmseg)?;
conn.shm_detach(shmseg)?;
Ok(())
}
fn receive_fd<C: Connection>(conn: &C, screen_num: usize) -> Result<(), ReplyOrIdError> {
let shmseg = conn.generate_id()?;
let segment_size = TEMP_FILE_CONTENT.len() as _;
let reply = conn
.shm_create_segment(shmseg, segment_size, false)?
.reply()?;
let shm::CreateSegmentReply { shm_fd, .. } = reply;
let addr = unsafe {
mmap(
null_mut(),
segment_size as _,
PROT_READ | PROT_WRITE,
MAP_SHARED,
shm_fd.as_raw_fd(),
0,
)
};
if addr == MAP_FAILED {
conn.shm_detach(shmseg)?;
return Err(ConnectionError::InsufficientMemory.into());
}
unsafe {
let slice = std::slice::from_raw_parts_mut(addr as *mut u8, segment_size as _);
slice.copy_from_slice(&TEMP_FILE_CONTENT);
}
use_shared_mem(conn, screen_num, shmseg)?;
conn.shm_detach(shmseg)?;
// Let's ignore the munmap() that we should do here
Ok(())
}
fn main() {
let file = make_file().expect("Failed to create temporary file for FD passing");
match connect(None) {
Err(err) => eprintln!("Failed to connect to the X11 server: {}", err),
Ok((conn, screen_num)) => {
// Check for SHM 1.2 support (needed for fd passing)
if let Some((major, minor)) = check_shm_version(&conn).unwrap() {
if major < 1 || (major == 1 && minor < 2) {
eprintln!(
"X11 server supports version {}.{} of the SHM extension, but version 1.2 \
is needed",
major, minor,
);
return;
}
} else {
eprintln!("X11 server does not support SHM extension");
return;
}
println!("Trying to send an FD");
send_fd(&conn, screen_num, file).unwrap();
println!("Trying to receive an FD");
receive_fd(&conn, screen_num).unwrap();
}
}
}
include!("integration_test_util/connect.rs");
|
