Function get_quote_via_vsock

tdx-attest/src/linux.rs:500–533

(report_data: &TdxReportData)

// ============================================================================

fn get_quote_via_vsock(report_data: &TdxReportData) -> Result<Vec<u8>> {
    use std::io::{Read as _, Write as _};

    let vsock_port = read_vsock_port()?;
    if vsock_port == 0 {
        return Err(TdxAttestError::NotSupported(format!(
            "no vsock port configured in {TDX_ATTEST_CONFIG_PATH}"
        )));
    }

    let report = get_report(report_data)?;
    let request = build_qgs_get_quote_request(&report.0);

    let mut stream = vsock::VsockStream::connect_with_cid_port(vsock::VMADDR_CID_HOST, vsock_port)?;

    let len_header = (request.len() as u32).to_be_bytes();
    stream.write_all(&len_header)?;
    stream.write_all(&request)?;

    let mut len_buf = [0u8; QGS_MSG_LEN_PREFIX_SIZE];
    stream.read_exact(&mut len_buf)?;
    let msg_len = u32::from_be_bytes(len_buf) as usize;

    if msg_len > QGS_REQ_BUF_SIZE {
        return Err(TdxAttestError::QuoteFailure(format!(
            "response too large: {msg_len}"
        )));
    }

    let mut response = vec![0u8; msg_len];
    stream.read_exact(&mut response)?;

    parse_qgs_get_quote_response(&response)
}

fn read_vsock_port() -> Result<u32> {
    let content = match fs::read_to_string(TDX_ATTEST_CONFIG_PATH) {