implement in-memory ruleset update

README.md

@@ -7,7 +7,8 @@ Experimental async SOCKS5 (TCP/UDP) proxy server based on [fast-socks5](https://
 * [ ] Range support
 * [ ] Local Web-API
   * [x] Block stats
-  * [ ] In-memory list update (without server restart)
+  * [x] In-memory list update (without server restart)
+    * [ ] Persist changes option
   * [ ] Performance optimization
 
 ## Usage
@@ -18,7 +19,9 @@ RUST_LOG=psocks=trace cargo run -- -a=/path/to/allow1.txt \
                                    no-auth
 ```
 * set `socks5://127.0.0.1:1080` proxy in your application
-* open http://127.0.0.1:8010 in browser for stats & control API
+* open http://127.0.0.1:8010 in browser for global stats:
+  * http://127.0.0.1:8010/allow/domain.com - add rule to the current session
+  * http://127.0.0.1:8010/block/domain.com - delete rule from the current session
 
 ### Allow list example
 

src/list.rs

@@ -1,6 +1,7 @@
 use anyhow::Result;
 use log::*;
 use std::collections::HashSet;
+use tokio::sync::RwLock;
 
 #[derive(PartialEq, Eq, Hash)]
 pub enum Item {
@@ -8,8 +9,20 @@ pub enum Item {
     Exact(String),
 }
 
+impl Item {
+    pub fn from_line(rule: &str) -> Self {
+        if let Some(item) = rule.strip_prefix(".") {
+            debug!("Add `{rule}` to the whitelist");
+            Self::Ending(item.to_string())
+        } else {
+            debug!("Add `{rule}` exact match to the whitelist");
+            Self::Exact(rule.to_string())
+        }
+    }
+}
+
 pub enum List {
-    Allow(HashSet<Item>),
+    Allow(RwLock<HashSet<Item>>),
 }
 
 impl List {
@@ -26,31 +39,40 @@ impl List {
                 if line.starts_with("/") || line.starts_with("#") || line.is_empty() {
                     continue;
                 }
-                if !this.insert(if let Some(item) = line.strip_prefix(".") {
-                    debug!("Add `{line}` to the whitelist");
-                    Item::Ending(item.to_string())
-                } else {
-                    debug!("Add `{line}` exact match to the whitelist");
-                    Item::Exact(line.to_string())
-                }) {
+                if !this.insert(Item::from_line(line)) {
                     warn!("Duplicated whitelist record: `{line}`")
                 }
             }
         }
         info!("Total whitelist entries parsed: {}", this.len());
-        Ok(Self::Allow(this))
+        Ok(Self::Allow(RwLock::new(this)))
     }
-    pub fn has(&self, value: &str) -> bool {
+    pub async fn any(&self, values: &[&str]) -> bool {
         match self {
-            Self::Allow(list) => list.iter().any(|item| match item {
-                Item::Exact(s) => s == value,
-                Item::Ending(s) => value.ends_with(s),
-            }),
+            Self::Allow(list) => {
+                let guard = list.read().await;
+                values.iter().any(|&value| {
+                    guard.iter().any(|item| match item {
+                        Item::Exact(v) => v == value,
+                        Item::Ending(v) => value.ends_with(v),
+                    })
+                })
             }
         }
-    pub fn entries(&self) -> usize {
+    }
+    pub async fn entries(&self) -> u64 {
         match self {
-            Self::Allow(list) => list.len(),
+            Self::Allow(list) => list.read().await.len() as u64,
+        }
+    }
+    pub async fn allow(&self, rule: &str) -> bool {
+        match self {
+            List::Allow(list) => list.write().await.insert(Item::from_line(rule)),
+        }
+    }
+    pub async fn block(&self, rule: &str) -> bool {
+        match self {
+            List::Allow(list) => list.write().await.remove(&Item::from_line(rule)),
         }
     }
 }

src/main.rs

@@ -10,28 +10,56 @@ use fast_socks5::{
 use list::List;
 use log::*;
 use opt::{AuthMode, Opt};
-use rocket::serde::json::Json;
+use rocket::{State, serde::json::Json};
 use stats::{Snapshot, Total};
 use std::{future::Future, sync::Arc};
 use structopt::StructOpt;
 use tokio::{net::TcpListener, task};
 
 #[rocket::get("/")]
-async fn index(totals: &rocket::State<Arc<Total>>) -> Json<Snapshot> {
+async fn index(totals: &State<Arc<Total>>) -> Json<Snapshot> {
     Json(totals.inner().snapshot())
 }
 
+#[rocket::get("/allow/<rule>")]
+async fn allow(rule: &str, list: &State<Arc<List>>, totals: &State<Arc<Total>>) -> Json<bool> {
+    let result = list.allow(rule).await;
+    totals.set_entries(list.entries().await);
+    info!("Delete `{rule}` from the in-memory rules (operation status: {result:?})");
+    Json(result)
+}
+
+#[rocket::get("/block/<rule>")]
+async fn block(rule: &str, list: &State<Arc<List>>, totals: &State<Arc<Total>>) -> Json<bool> {
+    let result = list.block(rule).await;
+    totals.set_entries(list.entries().await);
+    info!("Add `{rule}` to the in-memory rules (operation status: {result:?})");
+    Json(result)
+}
+
 #[rocket::launch]
 async fn rocket() -> _ {
     env_logger::init();
 
     let opt: &'static Opt = Box::leak(Box::new(Opt::from_args()));
-    let totals = Arc::new(Total::default());
+
+    let list = Arc::new(
+        List::from_opt(&opt.allow_list)
+            .await
+            .map_err(|err| {
+                error!("Can't parse whitelist: `{err}`");
+                SocksError::ArgumentInputError("Can't parse whitelist")
+            })
+            .unwrap(),
+    );
+
+    let totals = Arc::new(Total::with_entries(list.entries().await));
 
     tokio::spawn({
+        let socks_list = list.clone();
         let socks_totals = totals.clone();
         async move {
-            if let Err(err) = spawn_socks_server(opt, socks_totals).await {
+            if let Err(err) = spawn_socks_server(opt, socks_list, socks_totals).await {
                 error!("SOCKS server failed: `{err}`");
             }
         }
@@ -43,11 +71,12 @@ async fn rocket() -> _ {
             address: opt.api_addr.ip(),
             ..rocket::Config::release_default()
         })
+        .manage(list)
         .manage(totals)
-        .mount("/", rocket::routes![index])
+        .mount("/", rocket::routes![index, allow, block])
 }
 
-async fn spawn_socks_server(opt: &'static Opt, totals: Arc<Total>) -> Result<()> {
+async fn spawn_socks_server(opt: &'static Opt, list: Arc<List>, totals: Arc<Total>) -> Result<()> {
     if opt.allow_udp && opt.public_addr.is_none() {
         return Err(SocksError::ArgumentInputError(
             "Can't allow UDP if public-addr is not set",
@@ -59,13 +88,6 @@ async fn spawn_socks_server(opt: &'static Opt, totals: Arc<Total>) -> Result<()>
         ));
     }
 
-    let list = Arc::new(List::from_opt(&opt.allow_list).await.map_err(|err| {
-        error!("Can't parse whitelist: `{err}`");
-        SocksError::ArgumentInputError("Can't parse whitelist")
-    })?);
-
-    totals.set_entries(list.entries() as u64);
-
     let listener = TcpListener::bind(&opt.listen_addr).await?;
 
     info!("Listen for socks connections @ {}", &opt.listen_addr);
@@ -107,7 +129,7 @@ async fn serve_socks5(
     let (host, _) = request.2.clone().into_string_and_port(); // @TODO ref
     let (proto, cmd, addr) = request.resolve_dns().await?;
 
-    if !list.has(&host) && !list.has(&addr.to_string()) {
+    if !list.any(&[&host, &addr.to_string()]).await {
         totals.increase_blocked();
         info!("Blocked connection attempt to: {host}");
         proto.reply_error(&ReplyError::ConnectionNotAllowed).await?;

src/stats.rs

@@ -16,6 +16,12 @@ pub struct Total {
 }
 
 impl Total {
+    pub fn with_entries(entries: u64) -> Self {
+        Self {
+            entries: entries.into(),
+            ..Self::default()
+        }
+    }
     pub fn snapshot(&self) -> Snapshot {
         Snapshot {
             request: self.request.load(Ordering::Relaxed),