feat: add sans-io TFTP protocol crate

crates/pfs-tftp-sync/src/client.rs

@@ -0,0 +1,44 @@
+#![forbid(unsafe_code)]
+
+use std::net::SocketAddr;
+use std::time::Duration;
+
+/// Configuration for a synchronous TFTP client.
+#[derive(Debug, Clone)]
+pub struct ClientConfig {
+    pub timeout: Duration,
+    pub retries: u32,
+}
+
+impl Default for ClientConfig {
+    fn default() -> Self {
+        Self {
+            timeout: Duration::from_secs(5),
+            retries: 5,
+        }
+    }
+}
+
+/// A synchronous TFTP client.
+#[derive(Debug)]
+pub struct Client {
+    pub(crate) server: SocketAddr,
+    pub(crate) config: ClientConfig,
+}
+
+impl Client {
+    #[must_use]
+    pub fn new(server: SocketAddr, config: ClientConfig) -> Self {
+        Self { server, config }
+    }
+
+    #[must_use]
+    pub fn server(&self) -> SocketAddr {
+        self.server
+    }
+
+    #[must_use]
+    pub fn config(&self) -> &ClientConfig {
+        &self.config
+    }
+}

crates/pfs-tftp-sync/src/lib.rs

@@ -0,0 +1,13 @@
+//! Synchronous TFTP client/server helpers built on `pfs-tftp-proto`.
+//!
+//! This crate provides small, blocking APIs built on `std::net::UdpSocket`.
+//! It intentionally avoids async runtimes for simplicity.
+
+#![forbid(unsafe_code)]
+
+pub mod client;
+pub mod server;
+pub mod util;
+
+pub use client::{Client, ClientConfig};
+pub use server::{Server, ServerConfig};

crates/pfs-tftp-sync/src/server.rs

@@ -0,0 +1,47 @@
+#![forbid(unsafe_code)]
+
+use std::net::SocketAddr;
+use std::path::PathBuf;
+use std::time::Duration;
+
+/// Configuration for a synchronous TFTP server.
+#[derive(Debug, Clone)]
+pub struct ServerConfig {
+    pub bind: SocketAddr,
+    pub root: PathBuf,
+    pub allow_write: bool,
+    pub overwrite: bool,
+    pub timeout: Duration,
+    pub retries: u32,
+}
+
+impl Default for ServerConfig {
+    fn default() -> Self {
+        Self {
+            bind: SocketAddr::from(([0, 0, 0, 0], 6969)),
+            root: PathBuf::from("."),
+            allow_write: false,
+            overwrite: false,
+            timeout: Duration::from_secs(5),
+            retries: 5,
+        }
+    }
+}
+
+/// A synchronous TFTP server.
+#[derive(Debug)]
+pub struct Server {
+    pub(crate) config: ServerConfig,
+}
+
+impl Server {
+    #[must_use]
+    pub fn new(config: ServerConfig) -> Self {
+        Self { config }
+    }
+
+    #[must_use]
+    pub fn config(&self) -> &ServerConfig {
+        &self.config
+    }
+}

crates/pfs-tftp-sync/src/util.rs

@@ -0,0 +1,4 @@
+#![forbid(unsafe_code)]
+
+// Misc sync helpers live here.
+