p2p_channel 0.5.0

use super::{get_interface, LocalInterface, VntSocketTrait};

use anyhow::Context;
use std::net::Ipv4Addr;

#[cfg(any(target_os = "linux", target_os = "android"))]
impl VntSocketTrait for socket2::Socket {
    fn set_ip_unicast_if(&self, interface: &LocalInterface) -> anyhow::Result<()> {
        if let Some(name) = &interface.name {
            self.bind_device(Some(name.as_bytes()))
                .context("bind_device")?;
        }
        Ok(())
    }
}
#[cfg(target_os = "macos")]
impl VntSocketTrait for socket2::Socket {
    fn set_ip_unicast_if(&self, interface: &LocalInterface) -> anyhow::Result<()> {
        if interface.index != 0 {
            self.bind_device_by_index_v4(std::num::NonZeroU32::new(interface.index))
                .with_context(|| format!("bind_device_by_index_v4 {:?}", interface))?;
        }
        Ok(())
    }
}

pub fn get_best_interface(dest_ip: Ipv4Addr) -> anyhow::Result<LocalInterface> {
    match get_interface(dest_ip) {
        Ok(iface) => return Ok(iface),
        Err(e) => {
            log::warn!("not find interface e={:?},ip={}", e, dest_ip);
        }
    }
    // 应该再查路由表找到默认路由的
    Ok(LocalInterface::default())
}