➕ add ini files for both client and server

Long-lived servers can have their nickname configured in `server.ini`.
Clients can have a hosts-file-like nickname lookup in `client.ini`.

Cargo.lock

@@ -26,6 +26,32 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "configparser"
+version = "3.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06821ea598337a8412cf47c5b71c3bc694a7f0aed188ac28b836fab164a2c202"
+
+[[package]]
+name = "directories"
+version = "4.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f51c5d4ddabd36886dd3e1438cb358cdcb0d7c499cb99cb4ac2e38e18b5cb210"
+dependencies = [
+ "dirs-sys",
+]
+
+[[package]]
+name = "dirs-sys"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03d86534ed367a67548dc68113a0f5db55432fdfbb6e6f9d77704397d95d5780"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.3"
@@ -54,8 +80,10 @@ dependencies = [
 
 [[package]]
 name = "lookaround"
-version = "0.1.5"
+version = "0.1.6"
 dependencies = [
+ "configparser",
+ "directories",
  "mac_address",
  "rand",
  "thiserror",
@@ -195,6 +223,25 @@ dependencies = [
  "rand_core",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8383f39639269cde97d255a32bdb68c047337295414940c68bdd30c2e13203ff"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "redox_users"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "528532f3d801c87aec9def2add9ca802fe569e44a544afe633765267840abe64"
+dependencies = [
+ "getrandom",
+ "redox_syscall",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.82"

Cargo.toml

@@ -9,9 +9,11 @@ license = "AGPL-3.0"
 name = "lookaround"
 readme = "README.md"
 repository = "https://six-five-six-four.com/git/reactor/lookaround"
-version = "0.1.5"
+version = "0.1.6"
 
 [dependencies]
+configparser = "3.0.0"
+directories = "4.0.1"
 mac_address = "1.1.2"
 rand = "0.8.4"
 thiserror = "1.0.30"

README.md

@@ -19,29 +19,48 @@ Found 3 peers:
 LookAround is a Rust program for looking up your computers' MAC and IP addresses
 within a LAN. There's no central server, so it's not a look-up, it's a look-around.
 
-The client uses IP multicast to find servers within the
-same multicast domain, similar to Avahi and Bonjour.
+## Installing
 
-Systems self-identify by MAC address and nicknames. Public keys with
-TOFU semantics are intended before v1.0.0.
-
-## Installation
-
-Use the Cargo package manager from [Rust](https://rustup.rs/) to install LookAround.
+Make sure Cargo is installed from [RustUp.](https://rustup.rs/)
 
 ```bash
+# Install LookAround with Cargo
 cargo install lookaround
+
+# Find your config directory
+# Prints something like `Using config dir "/home/user/.config/lookaround"`
+lookaround config
 ```
 
-To auto-start the server as a normal user. 
-put this systemd unit in `~/.config/systemd/user/lookaround.service`:
+Create the files `client.ini` and/or `server.ini` in that directory
+(e.g. /home/user/.config/lookaround/server.ini)
+
+```ini
+# Clients can store MAC-nickname pairs in client.ini, like a hosts file.
+# This is useful if your servers are short-lived and you want the clients
+# to be the source of truth for nicknames.
+[nicknames]
+11-11-11-11-11-11 = laptop
+22-22-22-22-22-22 = desktop
+```
+
+```ini
+# Long-lived servers can have their nickname configured in server.ini
+[server]
+nickname = my-computer
+```
+
+## Auto-Start (Linux)
+
+Put this systemd unit in `~/.config/systemd/user/lookaround.service`:
 
 ```ini
 [Unit]
 Description=LookAround
 
 [Service]
-ExecStart=/home/user/.cargo/bin/lookaround server --nickname my-desktop
+ExecStart=/home/user/.cargo/bin/lookaround server
+Restart=always
 
 [Install]
 WantedBy=default.target
@@ -56,11 +75,19 @@ systemctl --user status lookaround
 systemctl --user enable lookaround
 ```
 
+## Auto-Start (Windows)
+
+(untested)
+
+- Create a shortcut to the LookAround exe
+- Change the shortcut's target to end in `lookaround.exe server` so it will run the server
+- Cut-paste the shortcut into the Startup folder in `C:\ProgramData\somewhere`
+
 ## Usage
-Run the server manually: (If you didn't configure auto-start)
+Run the server manually: (To test before installing)
 
 ```bash
-lookaround server --nickname my-desktop
+lookaround server --nickname my-computer
 ```
 
 On a client computer:

src/app_common.rs

@@ -1,5 +1,11 @@
 use crate::prelude::*;
 
+pub const LOOKAROUND_VERSION: &'static str = env! ("CARGO_PKG_VERSION");
+
+pub fn find_project_dirs () -> Option <ProjectDirs> {
+	ProjectDirs::from ("", "ReactorScram", "LookAround")
+}
+
 #[derive (Debug, thiserror::Error)]
 pub enum AppError {
 	#[error (transparent)]

src/client.rs

@@ -5,9 +5,14 @@ struct ServerResponse {
 	nickname: Option <String>,
 }
 
+struct ConfigFile {
+	nicknames: HashMap <String, String>,
+}
+
 struct ClientParams {
 	common: app_common::Params,
 	bind_addrs: Vec <Ipv4Addr>,
+	nicknames: HashMap <String, String>,
 	timeout_ms: u64,
 }
 
@@ -21,13 +26,13 @@ pub async fn client <I: Iterator <Item=String>> (args: I) -> Result <(), AppErro
 	}
 	
 	let params = configure_client (args)?;
-	let socket = make_socket (&params).await?;
+	let socket = make_socket (&params.common, params.bind_addrs).await?;
 	let msg = Message::new_request1 ().to_vec ()?;
 	tokio::spawn (send_requests (Arc::clone (&socket), params.common, msg));
 	
 	let mut peers = HashMap::with_capacity (10);
 	
-	timeout (Duration::from_millis (params.timeout_ms), listen_for_responses (&*socket, &mut peers)).await.ok ();
+	timeout (Duration::from_millis (params.timeout_ms), listen_for_responses (&*socket, params.nicknames, &mut peers)).await.ok ();
 	
 	let mut peers: Vec <_> = peers.into_iter ().collect ();
 	peers.sort_by_key (|(_, v)| v.mac);
@@ -60,6 +65,9 @@ pub async fn find_nick <I: Iterator <Item=String>> (mut args: I) -> Result <(),
 {
 	let mut nick = None;
 	let mut timeout_ms = 500;
+	let ConfigFile {
+		nicknames,
+	} = load_config_file ();
 	
 	while let Some (arg) = args.next () {
 		match arg.as_str () {
@@ -76,17 +84,13 @@ pub async fn find_nick <I: Iterator <Item=String>> (mut args: I) -> Result <(),
 	let needle_nick = nick.ok_or_else (|| CliArgError::MissingRequiredArg ("nickname".to_string ()))?;
 	let needle_nick = Some (needle_nick);
 	
-	let params = ClientParams {
-		common: Default::default (),
-		bind_addrs: get_ips ()?,
-		timeout_ms,
-	};
+	let common_params = Default::default ();
 	
-	let socket = make_socket (&params).await?;
+	let socket = make_socket (&common_params, get_ips ()?).await?;
 	let msg = Message::new_request1 ().to_vec ()?;
-	tokio::spawn (send_requests (Arc::clone (&socket), params.common, msg));
+	tokio::spawn (send_requests (Arc::clone (&socket), common_params, msg));
 	
-	timeout (Duration::from_millis (params.timeout_ms), async move { loop {
+	timeout (Duration::from_millis (timeout_ms), async move { loop {
 		let (msgs, remote_addr) = match recv_msg_from (&socket).await {
 			Err (_) => continue,
 			Ok (x) => x,
@@ -105,6 +109,8 @@ pub async fn find_nick <I: Iterator <Item=String>> (mut args: I) -> Result <(),
 			}
 		}
 		
+		resp.nickname = get_peer_nickname (&nicknames, resp.mac, resp.nickname);
+		
 		if resp.nickname == needle_nick {
 			println! ("{}", remote_addr.ip ());
 			return;
@@ -120,6 +126,10 @@ fn configure_client <I: Iterator <Item=String>> (mut args: I)
 	let mut bind_addrs = vec! [];
 	let mut timeout_ms = 500;
 	
+	let ConfigFile {
+		nicknames,
+	} = load_config_file ();
+	
 	while let Some (arg) = args.next () {
 		match arg.as_str () {
 			"--bind-addr" => {
@@ -145,15 +155,43 @@ fn configure_client <I: Iterator <Item=String>> (mut args: I)
 	Ok (ClientParams {
 		common: Default::default (),
 		bind_addrs,
+		nicknames,
 		timeout_ms,
 	})
 }
 
-async fn make_socket (params: &ClientParams) -> Result <Arc <UdpSocket>, AppError> {
+fn load_config_file () -> ConfigFile {
+	let mut nicknames: HashMap <String, String> = Default::default ();
+	
+	if let Some (proj_dirs) = find_project_dirs () {
+		let mut ini = Ini::new_cs ();
+		let path = proj_dirs.config_dir ().join ("client.ini");
+		if ini.load (&path).is_ok () {
+			let map_ref = ini.get_map_ref ();
+			if let Some (x) = map_ref.get ("nicknames") {
+				for (k, v) in x {
+					if let Some (v) = v {
+						let k = k.replace ('-', ":");
+						nicknames.insert (k, v.to_string ());
+					}
+				}
+			}
+		}
+	}
+	
+	ConfigFile {
+		nicknames,
+	}
+}
+
+async fn make_socket (
+	common_params: &app_common::Params,
+	bind_addrs: Vec <Ipv4Addr>,
+) -> Result <Arc <UdpSocket>, AppError> {
 	let socket = UdpSocket::bind (SocketAddrV4::new (Ipv4Addr::UNSPECIFIED, 0)).await?;
 	
-	for bind_addr in &params.bind_addrs {
-		if let Err (e) = socket.join_multicast_v4 (params.common.multicast_addr, *bind_addr) {
+	for bind_addr in &bind_addrs {
+		if let Err (e) = socket.join_multicast_v4 (common_params.multicast_addr, *bind_addr) {
 			println! ("Error joining multicast group with iface {}: {:?}", bind_addr, e);
 		}
 	}
@@ -177,7 +215,8 @@ async fn send_requests (
 }
 
 async fn listen_for_responses (
-	socket: &UdpSocket, 
+	socket: &UdpSocket,
+	nicknames: HashMap <String, String>,
 	peers: &mut HashMap <SocketAddr, ServerResponse>
 ) {
 	loop {
@@ -199,6 +238,63 @@ async fn listen_for_responses (
 			}
 		}
 		
+		resp.nickname = get_peer_nickname (&nicknames, resp.mac, resp.nickname);
+		
 		peers.insert (remote_addr, resp);
 	}
 }
+
+fn get_peer_nickname (
+	nicknames: &HashMap <String, String>,
+	mac: Option <[u8; 6]>,
+	peer_nickname: Option <String>
+) -> Option <String>
+{
+	match peer_nickname.as_ref ().map (String::as_str) {
+		None => (),
+		Some ("") => (),
+		_ => return peer_nickname,
+	}
+	
+	if let Some (mac) = &mac {
+		return nicknames.get (&format! ("{}", MacAddress::new (*mac))).cloned ()
+	}
+	
+	None
+}
+
+#[cfg (test)]
+mod test {
+	use super::*;
+	
+	#[test]
+	fn test_nicknames () {
+		let mut nicks = HashMap::new ();
+		
+		for (k, v) in [
+			("01:01:01:01:01:01", "phoenix")
+		] {
+			nicks.insert (k.to_string (), v.to_string ());
+		}
+		
+		for (num, (mac, peer_nickname), expected) in [
+			// Somehow the server returns no MAC nor nick. In this case we are helpless
+			( 1, (None, None), None),
+			// If the server tells us its MAC, we can look up our nickname for it
+			( 2, (Some ([1, 1, 1, 1, 1, 1]), None), Some ("phoenix")),
+			// Unless it's not in our nick list.
+			( 3, (Some ([1, 1, 1, 1, 1, 2]), None), None),
+			// If the server tells us its nickname, that always takes priority
+			( 4, (None, Some ("snowflake")), Some ("snowflake")),
+			( 5, (Some ([1, 1, 1, 1, 1, 1]), Some ("snowflake")), Some ("snowflake")),
+			( 6, (Some ([1, 1, 1, 1, 1, 2]), Some ("snowflake")), Some ("snowflake")),
+			// But blank nicknames are treated like None
+			( 7, (None, Some ("")), None),
+			( 8, (Some ([1, 1, 1, 1, 1, 1]), Some ("")), Some ("phoenix")),
+			( 9, (Some ([1, 1, 1, 1, 1, 2]), Some ("")), None),
+		] {
+			let actual = get_peer_nickname (&nicks, mac, peer_nickname.map (str::to_string));
+			assert_eq! (actual.as_ref ().map (String::as_str), expected, "{}", num);
+		}
+	}
+}

src/main.rs

@@ -28,7 +28,9 @@ async fn async_main () -> Result <(), AppError> {
 	
 	match subcommand.as_ref ().map (|x| &x[..]) {
 		None => return Err (CliArgError::MissingSubcommand.into ()),
+		Some ("--version") => println! ("lookaround v{}", LOOKAROUND_VERSION),
 		Some ("client") => client::client (args).await?,
+		Some ("config") => config (),
 		Some ("find-nick") => client::find_nick (args).await?,
 		Some ("my-ips") => my_ips ()?,
 		Some ("server") => server::server (args).await?,
@@ -38,6 +40,15 @@ async fn async_main () -> Result <(), AppError> {
 	Ok (())
 }
 
+fn config () {
+	if let Some (proj_dirs) = ProjectDirs::from ("", "ReactorScram", "LookAround") {
+		println! ("Using config dir {:?}", proj_dirs.config_dir ());
+	}
+	else {
+		println! ("Can't detect config dir.");
+	}
+}
+
 fn my_ips () -> Result <(), AppError> {
 	for addr in ip::get_ips ()?
 	{

src/prelude.rs

@@ -18,6 +18,8 @@ pub use std::{
 	},
 };
 
+pub use configparser::ini::Ini;
+pub use directories::ProjectDirs;
 pub use mac_address::{
 	MacAddress,
 	get_mac_address,
@@ -34,8 +36,10 @@ pub use tokio::{
 pub use crate::{
 	app_common::{
 		self,
+		LOOKAROUND_VERSION,
 		AppError,
 		CliArgError,
+		find_project_dirs,
 		recv_msg_from,
 	},
 	ip::get_ips,

src/server.rs

@@ -39,6 +39,23 @@ fn configure <I: Iterator <Item=String>> (mut args: I) -> Result <Params, AppErr
 	let mut bind_addrs = vec![];
 	let mut nickname = String::new ();
 	
+	if let Some (proj_dirs) = find_project_dirs () {
+		let mut ini = Ini::new_cs ();
+		let path = proj_dirs.config_dir ().join ("server.ini");
+		if ini.load (&path).is_ok () {
+			if let Some (x) = ini.get ("server", "nickname") {
+				nickname = x;
+				eprintln! ("Loaded nickname {:?}", nickname);
+			}
+		}
+		else {
+			eprintln! ("Can't load ini from {:?}, didn't load default configs", path);
+		}
+	}
+	else {
+		eprintln! ("Can't find config dir, didn't load default configs");
+	}
+	
 	while let Some (arg) = args.next () {
 		match arg.as_str () {
 			"--bind-addr" => {