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server: accept UVC probe on mismatched iface

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This commit is contained in:
Brad Stein 2026-01-06 14:51:52 -03:00
parent f043634ce2
commit 83f2aac696
1 changed files with 34 additions and 3 deletions
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37
server/src/bin/lesavka-uvc.rs
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@ -349,7 +349,8 @@ fn handle_setup(
) {
let interface_lo = (req.w_index & 0xff) as u8;
let interface_hi = (req.w_index >> 8) as u8;
let interface = if interface_lo == interfaces.streaming || interface_lo == interfaces.control {
let interface_raw = if interface_lo == interfaces.streaming || interface_lo == interfaces.control
{
interface_lo
} else if interface_hi == interfaces.streaming || interface_hi == interfaces.control {
interface_hi
@ -358,6 +359,7 @@ fn handle_setup(
};
let selector = (req.w_value >> 8) as u8;
let is_in = (req.b_request_type & USB_DIR_IN) != 0;
let interface = map_interface(interface_raw, selector, interfaces, debug);
if !is_in && req.b_request == UVC_SET_CUR {
if interface != interfaces.streaming {
@ -382,8 +384,14 @@ fn handle_setup(
return;
}
let payload =
build_in_response(state, interfaces, interface, selector, req.b_request, req.w_length);
let payload = build_in_response(
state,
interfaces,
interface,
selector,
req.b_request,
req.w_length,
);
match payload {
Some(bytes) => {
let _ = send_response(fd, uvc_send_response, &bytes);
@ -394,6 +402,29 @@ fn handle_setup(
}
}
fn map_interface(raw: u8, selector: u8, interfaces: UvcInterfaces, debug: bool) -> u8 {
if raw == interfaces.streaming || raw == interfaces.control {
return raw;
}
let mapped = if matches!(selector, UVC_VS_PROBE_CONTROL | UVC_VS_COMMIT_CONTROL) {
interfaces.streaming
} else if selector == UVC_VC_REQUEST_ERROR_CODE_CONTROL {
interfaces.control
} else {
raw
};
if debug && mapped != raw {
eprintln!(
"[lesavka-uvc] remapped interface {} -> {} for selector {selector}",
raw, mapped
);
}
mapped
}
fn handle_data(
state: &mut UvcState,
pending: &mut Option<PendingRequest>,