Initial commit

.cargo/config

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+[target.x86_64-unknown-linux-musl]
+linker = "x86_64-linux-musl-gcc"

.gitignore

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+/target

BUILDING.md

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+# Building from Source
+
+## Using Cargo
+
+```bash
+cargo build
+```
+
+## Completely static binary
+
+To compile a completely static binary (not linked to libc), we need to target
+musl using:
+
+```bash
+cargo build --target x86_64-unknown-linux-musl
+```
+
+At the moment, this is not possible to build on M1 Macs: 
+https://github.com/FiloSottile/homebrew-musl-cross/issues/23

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Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "distant"
+description = "Operate on a remote computer through file and process manipulation"
+version = "0.1.0"
+edition = "2018"
+authors = ["Chip Senkbeil <chip@senkbeil.org>"]
+
+[profile.release]
+opt-level = 'z'
+lto = true
+codegen-units = 1
+
+[dependencies]
+derive_more = { version = "0.99.16", default-features = false, features = ["display", "from", "error"] }
+hkdf = "0.11.0"
+hmac = "0.11.0"
+k256 = "0.9.6"
+log = "0.4.14"
+serde = { version = "1.0.126", features = ["derive"] }
+serde_cbor = "0.11.1"
+sha2 = "0.9.5"
+tokio = { version = "1.9.0", features = ["full"] }
+
+# Binary-specific dependencies
+lazy_static = "1.4.0"
+stderrlog = "0.5.1"
+structopt = "0.3.22"
+whoami = "1.1.2"

src/lib.rs

@@ -0,0 +1,14 @@
+mod opt;
+mod subcommand;
+
+pub use opt::Opt;
+
+pub fn init_logging(opt: &opt::CommonOpt) {
+    stderrlog::new()
+        .module("distant")
+        .quiet(opt.quiet)
+        .verbosity(opt.verbose as usize)
+        .timestamp(stderrlog::Timestamp::Off)
+        .init()
+        .unwrap();
+}

src/main.rs

@@ -0,0 +1,7 @@
+use distant::Opt;
+
+fn main() {
+    let opt = Opt::load();
+    distant::init_logging(&opt.common);
+    println!("Hello, world!");
+}

src/opt.rs

@@ -0,0 +1,76 @@
+use lazy_static::lazy_static;
+use std::{net::SocketAddr, path::PathBuf};
+use structopt::StructOpt;
+
+lazy_static! {
+    static ref USERNAME: String = whoami::username();
+}
+
+/// Options and commands to apply to binary
+#[derive(Debug, StructOpt)]
+#[structopt(name = "distant")]
+pub struct Opt {
+    #[structopt(flatten)]
+    pub common: CommonOpt,
+
+    #[structopt(subcommand)]
+    pub subcommand: Subcommand,
+}
+
+impl Opt {
+    /// Loads options from CLI arguments
+    pub fn load() -> Self {
+        Self::from_args()
+    }
+}
+
+/// Contains options that are common across subcommands
+#[derive(Debug, StructOpt)]
+pub struct CommonOpt {
+    /// Verbose mode (-v, -vv, -vvv, etc.)
+    #[structopt(short, long, parse(from_occurrences), global = true)]
+    pub verbose: u8,
+
+    /// Quiet mode
+    #[structopt(short, long, global = true)]
+    pub quiet: bool,
+}
+
+#[derive(Debug, StructOpt)]
+pub enum Subcommand {
+    #[structopt(visible_aliases = &["conn", "c"])]
+    Connect(ConnectSubcommand),
+    #[structopt(visible_aliases = &["exec", "x"])]
+    Execute(ExecuteSubcommand),
+    Launch(LaunchSubcommand),
+    #[structopt(visible_aliases = &["l"])]
+    Listen(ListenSubcommand),
+}
+
+/// Represents subcommand to connect to an already-running remote server
+#[derive(Debug, StructOpt)]
+pub struct ConnectSubcommand {}
+
+/// Represents subcommand to execute some operation remotely
+#[derive(Debug, StructOpt)]
+pub struct ExecuteSubcommand {}
+
+/// Represents subcommand to launch a remote server
+#[derive(Debug, StructOpt)]
+pub struct LaunchSubcommand {
+    /// Username to use when sshing into remote machine
+    #[structopt(short, long, default_value = &USERNAME)]
+    pub username: String,
+
+    /// Explicit identity file to use with ssh
+    #[structopt(short, long)]
+    pub identity_file: Option<PathBuf>,
+
+    /// Destination of remote machine to launch binary
+    #[structopt(name = "DESTINATION")]
+    pub destination: SocketAddr,
+}
+
+/// Represents subcommand to operate in listen mode for incoming requests
+#[derive(Debug, StructOpt)]
+pub struct ListenSubcommand {}

src/subcommand/launch.rs

@@ -0,0 +1,34 @@
+use crate::opt::{CommonOpt, LaunchSubcommand};
+use derive_more::{Display, Error, From};
+use std::string::FromUtf8Error;
+use tokio::{io, process::Command};
+
+pub type Result = std::result::Result<(), Error>;
+
+#[derive(Debug, Display, Error, From)]
+pub enum Error {
+    IoError(io::Error),
+    Utf8Error(FromUtf8Error),
+}
+
+pub async fn run(cmd: LaunchSubcommand, opt: CommonOpt) -> Result {
+    let remote_command = r#"distant listen --print-port"#;
+    let ssh_command = format!(
+        "ssh -o StrictHostKeyChecking=no ssh://{}@{} {} {}",
+        cmd.username,
+        cmd.destination,
+        cmd.identity_file
+            .map(|f| format!("-i {}", f.as_path().display()))
+            .unwrap_or_default(),
+        remote_command,
+    );
+    let out = Command::new("sh")
+        .arg("-c")
+        .arg(ssh_command)
+        .output()
+        .await?;
+    let out = String::from_utf8(out.stdout)?.trim().to_string();
+    println!("{}", out);
+
+    Ok(())
+}

src/subcommand/mod.rs

@@ -0,0 +1 @@
+pub mod launch;