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control.rs
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control.rs
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use embassy_net_driver_channel as ch;
use embassy_net_driver_channel::driver::{HardwareAddress, LinkState};
use heapless::String;
use crate::ioctl::Shared;
use crate::proto::{self, CtrlMsg};
/// Errors reported by control.
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub enum Error {
/// The operation failed with the given error code.
Failed(u32),
/// The operation timed out.
Timeout,
/// Internal error.
Internal,
}
/// Handle for managing the network and WiFI state.
pub struct Control<'a> {
state_ch: ch::StateRunner<'a>,
shared: &'a Shared,
}
/// WiFi mode.
#[allow(unused)]
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
enum WifiMode {
/// No mode.
None = 0,
/// Client station.
Sta = 1,
/// Access point mode.
Ap = 2,
/// Repeater mode.
ApSta = 3,
}
pub use proto::CtrlWifiSecProt as Security;
/// WiFi status.
#[derive(Clone, Debug)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct Status {
/// Service Set Identifier.
pub ssid: String<32>,
/// Basic Service Set Identifier.
pub bssid: [u8; 6],
/// Received Signal Strength Indicator.
pub rssi: i32,
/// WiFi channel.
pub channel: u32,
/// Security mode.
pub security: Security,
}
macro_rules! ioctl {
($self:ident, $req_variant:ident, $resp_variant:ident, $req:ident, $resp:ident) => {
let mut msg = proto::CtrlMsg {
msg_id: proto::CtrlMsgId::$req_variant as _,
msg_type: proto::CtrlMsgType::Req as _,
payload: Some(proto::CtrlMsgPayload::$req_variant($req)),
};
$self.ioctl(&mut msg).await?;
#[allow(unused_mut)]
let Some(proto::CtrlMsgPayload::$resp_variant(mut $resp)) = msg.payload
else {
warn!("unexpected response variant");
return Err(Error::Internal);
};
if $resp.resp != 0 {
return Err(Error::Failed($resp.resp));
}
};
}
impl<'a> Control<'a> {
pub(crate) fn new(state_ch: ch::StateRunner<'a>, shared: &'a Shared) -> Self {
Self { state_ch, shared }
}
/// Initialize device.
pub async fn init(&mut self) -> Result<(), Error> {
debug!("wait for init event...");
self.shared.init_wait().await;
debug!("set heartbeat");
self.set_heartbeat(10).await?;
debug!("set wifi mode");
self.set_wifi_mode(WifiMode::Sta as _).await?;
let mac_addr = self.get_mac_addr().await?;
debug!("mac addr: {:02x}", mac_addr);
self.state_ch.set_hardware_address(HardwareAddress::Ethernet(mac_addr));
Ok(())
}
/// Get the current status.
pub async fn get_status(&mut self) -> Result<Status, Error> {
let req = proto::CtrlMsgReqGetApConfig {};
ioctl!(self, ReqGetApConfig, RespGetApConfig, req, resp);
trim_nulls(&mut resp.ssid);
Ok(Status {
ssid: resp.ssid,
bssid: parse_mac(&resp.bssid)?,
rssi: resp.rssi as _,
channel: resp.chnl,
security: resp.sec_prot,
})
}
/// Connect to the network identified by ssid using the provided password.
pub async fn connect(&mut self, ssid: &str, password: &str) -> Result<(), Error> {
let req = proto::CtrlMsgReqConnectAp {
ssid: unwrap!(String::try_from(ssid)),
pwd: unwrap!(String::try_from(password)),
bssid: String::new(),
listen_interval: 3,
is_wpa3_supported: false,
};
ioctl!(self, ReqConnectAp, RespConnectAp, req, resp);
self.state_ch.set_link_state(LinkState::Up);
Ok(())
}
/// Disconnect from any currently connected network.
pub async fn disconnect(&mut self) -> Result<(), Error> {
let req = proto::CtrlMsgReqGetStatus {};
ioctl!(self, ReqDisconnectAp, RespDisconnectAp, req, resp);
self.state_ch.set_link_state(LinkState::Down);
Ok(())
}
/// duration in seconds, clamped to [10, 3600]
async fn set_heartbeat(&mut self, duration: u32) -> Result<(), Error> {
let req = proto::CtrlMsgReqConfigHeartbeat { enable: true, duration };
ioctl!(self, ReqConfigHeartbeat, RespConfigHeartbeat, req, resp);
Ok(())
}
async fn get_mac_addr(&mut self) -> Result<[u8; 6], Error> {
let req = proto::CtrlMsgReqGetMacAddress {
mode: WifiMode::Sta as _,
};
ioctl!(self, ReqGetMacAddress, RespGetMacAddress, req, resp);
parse_mac(&resp.mac)
}
async fn set_wifi_mode(&mut self, mode: u32) -> Result<(), Error> {
let req = proto::CtrlMsgReqSetMode { mode };
ioctl!(self, ReqSetWifiMode, RespSetWifiMode, req, resp);
Ok(())
}
async fn ioctl(&mut self, msg: &mut CtrlMsg) -> Result<(), Error> {
debug!("ioctl req: {:?}", &msg);
let mut buf = [0u8; 128];
let req_len = noproto::write(msg, &mut buf).map_err(|_| {
warn!("failed to serialize control request");
Error::Internal
})?;
struct CancelOnDrop<'a>(&'a Shared);
impl CancelOnDrop<'_> {
fn defuse(self) {
core::mem::forget(self);
}
}
impl Drop for CancelOnDrop<'_> {
fn drop(&mut self) {
self.0.ioctl_cancel();
}
}
let ioctl = CancelOnDrop(self.shared);
let resp_len = ioctl.0.ioctl(&mut buf, req_len).await;
ioctl.defuse();
*msg = noproto::read(&buf[..resp_len]).map_err(|_| {
warn!("failed to serialize control request");
Error::Internal
})?;
debug!("ioctl resp: {:?}", msg);
Ok(())
}
}
// WHY IS THIS A STRING? WHYYYY
fn parse_mac(mac: &str) -> Result<[u8; 6], Error> {
fn nibble_from_hex(b: u8) -> Result<u8, Error> {
match b {
b'0'..=b'9' => Ok(b - b'0'),
b'a'..=b'f' => Ok(b + 0xa - b'a'),
b'A'..=b'F' => Ok(b + 0xa - b'A'),
_ => {
warn!("invalid hex digit {}", b);
Err(Error::Internal)
}
}
}
let mac = mac.as_bytes();
let mut res = [0; 6];
if mac.len() != 17 {
warn!("unexpected MAC length");
return Err(Error::Internal);
}
for (i, b) in res.iter_mut().enumerate() {
*b = (nibble_from_hex(mac[i * 3])? << 4) | nibble_from_hex(mac[i * 3 + 1])?
}
Ok(res)
}
fn trim_nulls<const N: usize>(s: &mut String<N>) {
while s.chars().rev().next() == Some(0 as char) {
s.pop();
}
}