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use std::env;
use std::net::SocketAddrV4;
use igd::aio::search_gateway;
use igd::PortMappingProtocol;
struct DiplonatConfig {
private_ip: String,
refresh_time: u32,
expiration_time: u32
}
fn fetch_configuration() -> Result<DiplonatConfig, String> {
let env_private_ip = "DIPLONAT_PRIVATE_IP";
let private_ip = match env::var(env_private_ip) {
Ok(val) => val,
Err(e) => return Err(format!("unable to fetch environment variable {}: {}", env_private_ip, e)),
};
let env_refresh_time = "DIPLONAT_REFRESH_TIME";
let refresh_time: u32 = match env::var(env_refresh_time) {
Ok(val) => val.parse().unwrap(),
Err(e) => return Err(format!("unable to fetch environment variable {}: {}", env_refresh_time,e))
};
let env_expiration_time = "DIPLONAT_EXPIRATION_TIME";
let expiration_time: u32 = match env::var(env_expiration_time) {
Ok(val) => val.parse().unwrap(),
Err(e) => return Err(format!("unable to fetch environment variable {}: {}", env_expiration_time,e))
};
if refresh_time * 2 > expiration_time {
return Err(format!("Expiration time (currently: {}s) must be twice bigger than refresh time (currently: {}s)", expiration_time, refresh_time))
}
let config = DiplonatConfig { private_ip: private_ip, refresh_time: refresh_time, expiration_time: expiration_time };
println!("\tPrivate IP address: {}", config.private_ip);
println!("\tRefresh time: {} seconds", config.refresh_time);
println!("\tExpiration time: {} seconds", config.expiration_time);
return Ok(config);
}
#[tokio::main]
async fn main() {
let config = match fetch_configuration() {
Ok(val) => val,
Err(e) => return println!("unable to build configuration: {}", e),
};
let gateway = match search_gateway(Default::default()).await {
Ok(g) => g,
Err(err) => return println!("Faild to find IGD: {}", err),
};
let service = format!("{}:{}", config.private_ip, 1234);
let service: SocketAddrV4 = service.parse().expect("Invalid socket address");
match gateway.add_port(PortMappingProtocol::TCP, 1234, service, config.expiration_time, "diplonat").await {
Ok(_) => (),
Err(e) => return println!("Unable to insert port 1234: {}", e),
};
}
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