implement reload command

Cargo.lock

@@ -570,6 +570,7 @@ dependencies = [
  "sd-notify",
  "serde",
  "serde_test",
+ "sysinfo",
  "thiserror",
  "tokio",
  "tokio-stream",
@@ -591,6 +592,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "ntapi"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8a3895c6391c39d7fe7ebc444a87eb2991b2a0bc718fdabd071eec617fc68e4"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "nu-ansi-term"
 version = "0.50.3"
@@ -600,6 +610,25 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "objc2-core-foundation"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a180dd8642fa45cdb7dd721cd4c11b1cadd4929ce112ebd8b9f5803cc79d536"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "objc2-io-kit"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33fafba39597d6dc1fb709123dfa8289d39406734be322956a69f0931c73bb15"
+dependencies = [
+ "libc",
+ "objc2-core-foundation",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.21.3"
@@ -883,6 +912,20 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "sysinfo"
+version = "0.37.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "16607d5caffd1c07ce073528f9ed972d88db15dd44023fa57142963be3feb11f"
+dependencies = [
+ "libc",
+ "memchr",
+ "ntapi",
+ "objc2-core-foundation",
+ "objc2-io-kit",
+ "windows",
+]
+
 [[package]]
 name = "thiserror"
 version = "2.0.17"
@@ -1084,6 +1127,28 @@ version = "0.11.1+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ccf3ec651a847eb01de73ccad15eb7d99f80485de043efb2f370cd654f4ea44b"
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows"
 version = "0.61.3"

Cargo.toml

@@ -2,7 +2,7 @@
 name = "netnsd"
 version = "0.1.0"
 edition = "2024"
-rust-version = "1.87.0"
+rust-version = "1.88.0"
 
 [dependencies]
 tokio = { version = "1.48.0", features = ["macros", "rt", "signal", "net", "io-util"] }
@@ -21,6 +21,7 @@ futures-concurrency = "7.6.3"
 neli = "0.7.1"
 either = "1.15.0"
 uzers = "0.12.1"
+sysinfo = "0.37.2"
 
 [dev-dependencies]
 serde_test = "1.0.177"

src/main.rs

@@ -1,18 +1,23 @@
-use std::path::{PathBuf};
-use clap::{Parser, Subcommand};
-use main_error::MainResult;
 use crate::config::{Config, ForwardSource, ForwardTarget, NamespaceName};
 use crate::daemon::daemon;
 use crate::down::down;
 use crate::proxy::proxy;
 use crate::up::up;
+use clap::{Parser, Subcommand};
+use main_error::MainResult;
+use std::path::PathBuf;
+use nix::errno::Errno;
+use nix::sys::signal::{kill, Signal};
+use nix::unistd::Pid;
+use sysinfo::{ProcessRefreshKind, RefreshKind, System, UpdateKind};
+use tracing::{error, info, warn};
 
 mod config;
 mod daemon;
+mod down;
+mod link;
 mod namespace;
 mod proxy;
-mod link;
-mod down;
 mod up;
 
 #[derive(Parser, Debug)]
@@ -61,20 +66,48 @@ fn main() -> MainResult {
             let config = Config::load(config)?;
             daemon(config)
         }
-        Commands::Up {config} => {
+        Commands::Up { config } => {
             let config = Config::load(config)?;
             up(config)
         }
-        Commands::Down => {
+        Commands::Down => down(),
-            down()
-        }
         Commands::Reload => reload(),
-        Commands::Proxy {source, target, source_namespace, target_namespace} => {
+        Commands::Proxy {
-            proxy(source_namespace, target_namespace, source, target)
+            source,
-        },
+            target,
+            source_namespace,
+            target_namespace,
+        } => proxy(source_namespace, target_namespace, source, target),
     }
 }
 
 fn reload() -> MainResult {
-    todo!()
+    let s = System::new_with_specifics(
+        RefreshKind::default()
+            .with_processes(ProcessRefreshKind::default().with_cmd(UpdateKind::OnlyIfNotSet)),
+    );
+
+    let mut found = false;
+    for proc in s.processes_by_exact_name("netnsd".as_ref()) {
+        if proc.cmd().get(1).and_then(|s| s.to_str()) == Some("daemon") {
+            found = true;
+            match kill(Pid::from_raw(proc.pid().as_u32() as i32), Signal::SIGHUP) {
+                Ok(_) => {
+                    info!("Sent reload command to daemon")
+                },
+                Err(Errno::EPERM) => {
+                    error!("Sending signal not permitted, try are you running the command as root?");
+                },
+                Err(error) => {
+                    error!(%error, "Unexpected error");
+                }
+            }
+        }
+    }
+
+    if !found {
+        warn!("No daemon process found")
+    }
+
+    Ok(())
 }