igd_async_std 0.12.4

Internet Gateway Protocol client
Documentation 
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use std::{
  collections::HashMap,
  net::{SocketAddrV4, UdpSocket},
  str,
};

use crate::{
  common::{messages, parsing, SearchOptions},
  errors::SearchError,
  gateway::Gateway,
};

/// Search gateway, using the given `SearchOptions`.
///
/// The default `SearchOptions` should suffice in most cases.
/// It can be created with `Default::default()` or `SearchOptions::default()`.
///
/// # Example
/// ```no_run
/// use igd_async_std::{search_gateway, SearchOptions, Result};
///
/// fn main() -> Result {
///     let gateway = search_gateway(Default::default())?;
///     let ip = gateway.get_external_ip()?;
///     println!("External IP address: {}", ip);
///     Ok(())
/// }
/// ```
pub fn search_gateway(options: SearchOptions) -> Result<Gateway, SearchError> {
  let socket = UdpSocket::bind(options.bind_addr)?;
  socket.set_read_timeout(options.timeout)?;

  socket.send_to(
    messages::SEARCH_REQUEST.as_bytes(),
    options.broadcast_address,
  )?;

  loop {
    let mut buf = [0u8; 1500];
    let (read, _) = socket.recv_from(&mut buf)?;
    let text = str::from_utf8(&buf[..read])?;

    let (addr, root_url) = parsing::parse_search_result(text)?;

    let (control_schema_url, control_url) = match get_control_urls(&addr, &root_url) {
      Ok(o) => o,
      Err(..) => continue,
    };

    let control_schema = match get_schemas(&addr, &control_schema_url) {
      Ok(o) => o,
      Err(..) => continue,
    };

    return Ok(Gateway {
      addr,
      root_url,
      control_url,
      control_schema_url,
      control_schema,
    });
  }
}

fn get_control_urls(addr: &SocketAddrV4, root_url: &str) -> Result<(String, String), SearchError> {
  let url = format!("http://{}:{}{}", addr.ip(), addr.port(), root_url);
  let response = attohttpc::get(&url).send()?;
  parsing::parse_control_urls(&response.bytes()?[..])
}

fn get_schemas(
  addr: &SocketAddrV4,
  control_schema_url: &str,
) -> Result<HashMap<String, Vec<String>>, SearchError> {
  let url = format!("http://{}:{}{}", addr.ip(), addr.port(), control_schema_url);
  let response = attohttpc::get(&url).send()?;
  parsing::parse_schemas(&response.bytes()?[..])
}