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// -*- coding: utf-8 -*-
//
// Copyright (C) 2024 Michael Büsch <m@bues.ch>
//
// Licensed under the Apache License version 2.0
// or the MIT license, at your option.
// SPDX-License-Identifier: Apache-2.0 OR MIT
#![forbid(unsafe_code)]
mod client;
mod command;
mod resolver;
use crate::command::{genkey::run_genkey, knock::run_knock};
use anyhow::{self as ah, Context as _};
use clap::{Parser, Subcommand};
use letmein_conf::{Config, ConfigVariant, CLIENT_CONF_PATH, INSTALL_PREFIX};
use letmein_proto::UserId;
use std::{path::PathBuf, sync::Arc};
#[derive(Parser, Debug)]
struct Opts {
/// Override the default path to the configuration file.
#[arg(short, long)]
config: Option<PathBuf>,
/// Show detailed information about what happens internally.
#[arg(long)]
verbose: bool,
#[command(subcommand)]
command: Command,
}
impl Opts {
pub fn get_config(&self) -> PathBuf {
if let Some(config) = &self.config {
config.clone()
} else {
format!("{INSTALL_PREFIX}{CLIENT_CONF_PATH}").into()
}
}
}
fn parse_user(s: &str) -> ah::Result<UserId> {
s.parse()
}
#[derive(Subcommand, Debug)]
enum Command {
/// Knock a port open on a server.
Knock {
/// The host name, IPv4 or IPv6 address that you want to knock on.
host: String,
/// The port on the remote host that you want to knock open.
port: u16,
/// The user identifier for authenticating the knock request.
///
/// The user identifier is a 8 digits hex number.
///
/// The authentication key associated with this user identifier
/// will be fetched from the letmein.conf configuration file.
///
/// If not given, then the `[CLIENT] default_user` from the
/// configuration file will be used instead.
/// If the configuration is not available, user 00000000 will
/// be used instead.
#[arg(short, long, value_parser = parse_user)]
user: Option<UserId>,
/// letmein server port number.
///
/// You normally don't have to use this option.
///
/// Set the letmein server port number to use when contacting the letmein server.
///
/// If not given, then the `[GENERAL] port` from the
/// letmein.conf configuration file will be used instead.
/// If the configuration is not available, port 5800 will
/// be used instead.
#[arg(short = 'P', long)]
server_port: Option<u16>,
/// Resolve HOST into an IPv4 address.
///
/// Resolve the HOST into an IPv4 address and knock on that address.
///
/// If none of the --ipv4 and --ipv6 options are given,
/// then knocking on both IPv4 and IPv6 is tried, but no error is
/// shown, if one of them failed.
///
/// If both of the --ipv4 and --ipv6 options are given,
/// then knocking on both IPv4 and IPv6 is done and an error is shown,
/// if any one fails.
#[arg(short = '4', long)]
ipv4: bool,
/// Resolve HOST into an IPv6 address.
///
/// Resolve the HOST into an IPv6 address and knock on that address.
///
/// If none of the --ipv4 and --ipv6 options are given,
/// then knocking on both IPv4 and IPv6 is tried, but no error is
/// shown, if one of them failed.
///
/// If both of the --ipv4 and --ipv6 options are given,
/// then knocking on both IPv4 and IPv6 is done and an error is shown,
/// if any one fails.
#[arg(short = '6', long)]
ipv6: bool,
},
/// Generate a new shared secret key.
GenKey {
/// The user identifier (8 digits hex number) to use in the
/// generated key string.
/// If not given, then the `[CLIENT] default_user` from the
/// configuration file will be used instead.
/// If the configuration is not available, user 00000000 will
/// be used instead.
#[arg(long, short, value_parser = parse_user)]
user: Option<UserId>,
},
}
#[tokio::main(flavor = "current_thread")]
async fn main() -> ah::Result<()> {
let opts = Opts::parse();
let mut conf = Config::new(ConfigVariant::Client);
conf.load(&opts.get_config())
.context("Configuration file")?;
let conf = Arc::new(conf);
match opts.command {
Command::Knock {
host,
port,
user,
server_port,
ipv4,
ipv6,
} => {
run_knock(
conf,
opts.verbose,
&host,
(ipv4, ipv6).into(),
server_port,
port,
user,
)
.await?;
}
Command::GenKey { user } => run_genkey(conf, user).await?,
}
Ok(())
}
// vim: ts=4 sw=4 expandtab
|
