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fix: use magic bytes 0xff 0xff in idm to improve reliability

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This commit is contained in:
Alex Zenla
2024-04-14 12:25:37 +00:00
parent 66574235c2
commit 69838f7313
2 changed files with 26 additions and 9 deletions
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26
crates/daemon/src/idm.rs
View File

@ -120,16 +120,22 @@ impl DaemonIdm {
if let Some(data) = data {
let buffer = buffers.entry(domid).or_insert_with_key(|_| BytesMut::new());
buffer.extend_from_slice(&data);
if buffer.len() < 4 {
if buffer.len() < 6 {
continue;
}
let size = (buffer[0] as u32 | (buffer[1] as u32) << 8 | (buffer[2] as u32) << 16 | (buffer[3] as u32) << 24) as usize;
let needed = size + 4;
if buffer[0] != 0xff || buffer[1] != 0xff {
buffer.clear();
continue;
}
let size = (buffer[2] as u32 | (buffer[3] as u32) << 8 | (buffer[4] as u32) << 16 | (buffer[5] as u32) << 24) as usize;
let needed = size + 6;
if buffer.len() < needed {
continue;
}
let mut packet = buffer.split_to(needed);
packet.advance(4);
packet.advance(6);
match IdmPacket::decode(packet) {
Ok(packet) => {
let _ = client_or_create(domid, &self.tx_sender, &self.clients, &self.feeds).await?;
@ -159,12 +165,14 @@ impl DaemonIdm {
x = self.tx_receiver.recv() => match x {
Some((domid, packet)) => {
let data = packet.encode_to_vec();
let mut buffer = vec![0u8; 4];
let mut buffer = vec![0u8; 6];
let length = data.len() as u32;
buffer[0] = length as u8;
buffer[1] = (length << 8) as u8;
buffer[2] = (length << 16) as u8;
buffer[3] = (length << 24) as u8;
buffer[0] = 0xff;
buffer[1] = 0xff;
buffer[2] = length as u8;
buffer[3] = (length << 8) as u8;
buffer[4] = (length << 16) as u8;
buffer[5] = (length << 24) as u8;
buffer.extend_from_slice(&data);
self.tx_raw_sender.send((domid, buffer)).await?;
let _ = self.snoop_sender.send(DaemonIdmSnoopPacket { from: 0, to: domid, packet });

9
crates/krata/src/idm/client.rs
View File

@ -69,6 +69,14 @@ impl IdmBackend for IdmFileBackend {
async fn recv(&mut self) -> Result<IdmPacket> {
let mut fd = self.read_fd.lock().await;
let mut guard = fd.readable_mut().await?;
let b1 = guard.get_inner_mut().read_u8().await?;
if b1 != 0xff {
return Ok(IdmPacket::default());
}
let b2 = guard.get_inner_mut().read_u8().await?;
if b2 != 0xff {
return Ok(IdmPacket::default());
}
let size = guard.get_inner_mut().read_u32_le().await?;
if size == 0 {
return Ok(IdmPacket::default());
@ -84,6 +92,7 @@ impl IdmBackend for IdmFileBackend {
async fn send(&mut self, packet: IdmPacket) -> Result<()> {
let mut file = self.write.lock().await;
let data = packet.encode_to_vec();
file.write_all(&[0xff, 0xff]).await?;
file.write_u32_le(data.len() as u32).await?;
file.write_all(&data).await?;
Ok(())