vsock_service_config/
vsock_service_config_rust_config_lib_source.rs

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use fidl::unpersist;
use fidl_cf_sc_internal_vsockserviceconfig::Config as FidlConfig;
use fuchsia_inspect::Node;
use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
#[derive(Debug)]
pub struct Config {
    pub guest_to_host_supported: bool,
    pub loopback_supported: bool,
}
impl Config {
    pub fn take_from_startup_handle() -> Self {
        let config_vmo: zx::Vmo =
            take_startup_handle(HandleInfo::new(HandleType::ComponentConfigVmo, 0))
                .expect("Config VMO handle must be provided and cannot already have been taken.")
                .into();
        let config_size =
            config_vmo.get_content_size().expect("must be able to read config vmo content size");
        assert_ne!(config_size, 0, "config vmo must be non-empty");
        let config_bytes =
            config_vmo.read_to_vec(0, config_size).expect("must be able to read config vmo");
        let checksum_length = u16::from_le_bytes([config_bytes[0], config_bytes[1]]) as usize;
        let fidl_start = 2 + checksum_length;
        let observed_checksum = &config_bytes[2..fidl_start];
        let expected_checksum = vec![
            0xc0, 0x8e, 0xcc, 0x50, 0xce, 0x45, 0x9d, 0xc9, 0x44, 0x27, 0x6d, 0x69, 0x69, 0x6a,
            0x9f, 0xd5, 0x9a, 0x1d, 0x83, 0x71, 0xf9, 0x8e, 0x7b, 0xa3, 0xcb, 0x37, 0x93, 0x8f,
            0x0b, 0x3c, 0xbd, 0x95,
        ];
        assert_eq!(
            observed_checksum, expected_checksum,
            "checksum from config VMO does not match expected checksum"
        );
        let fidl_config: FidlConfig = unpersist(&config_bytes[fidl_start..])
            .expect("must be able to parse bytes as config FIDL");
        Self {
            guest_to_host_supported: fidl_config.guest_to_host_supported,
            loopback_supported: fidl_config.loopback_supported,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_bool("guest_to_host_supported", self.guest_to_host_supported);
        inspector_node.record_bool("loopback_supported", self.loopback_supported);
    }
}