Merge pull request #12 from GreenPenguino/timestamp

Add timestamp

Cargo.toml

@@ -5,9 +5,24 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+default-run = "proxy"
+
+[[bin]]
+name = "proxy"
+path = "src/bin/proxy.rs"
+
+[[bin]]
+name = "ping-server"
+path = "src/bin/ping_server.rs"
+
+[[bin]]
+name = "ping-client"
+path = "src/bin/ping_client.rs"
+
 [dependencies]
 anyhow = "1.0.69"
 axum = { version = "0.6.11", features = ["json"] }
+clap = { version = "4.3.0", features = ["derive"] }
 p384 = { version = "0.13.0", features = ["ecdsa", "serde"] }
 serde = { version = "1.0.155", features = ["derive"] }
 serde_json = "1.0.94"

src/bin/ping_client.rs

@@ -0,0 +1,100 @@
+use clap::Parser;
+use std::net::SocketAddrV4;
+use std::str::FromStr;
+use std::sync::{
+    atomic::{AtomicBool, AtomicU32, Ordering},
+    Arc, Mutex,
+};
+use std::time::{Duration, Instant};
+use tokio::{
+    io::{AsyncReadExt, AsyncWriteExt},
+    net::TcpStream,
+    time::sleep,
+};
+
+#[tokio::main]
+async fn main() {
+    let args = Args::parse();
+
+    let in_transit = Arc::new(AtomicBool::new(false));
+    let in_transit2 = in_transit.clone();
+    let out_timestamp = Arc::new(Mutex::new(Instant::now()));
+    let out_timestamp2 = out_timestamp.clone();
+    let count = AtomicU32::new(args.count);
+
+    let addr = SocketAddrV4::from_str(&args.address).unwrap();
+
+    let stream = TcpStream::connect(addr).await.unwrap();
+    if !args.csv {
+        println!("Ping {addr}");
+    }
+
+    let (mut si, mut so) = stream.into_split();
+
+    let ping_in = async move {
+        let mut read_buf = [0; 1024];
+        while count.load(Ordering::Relaxed) > 0 {
+            let bytes = si.read(&mut read_buf).await.unwrap();
+            if bytes > 0 {
+                let in_timestamp = Instant::now();
+                // println!("Received {bytes} bytes");
+
+                let duration = in_timestamp.duration_since(*out_timestamp.lock().unwrap());
+                let i = u32::from_be_bytes(read_buf[0..bytes].try_into().unwrap());
+                let rtt = duration.as_micros();
+                if !args.csv {
+                    println!("Ping {i} arrived with RTT of {rtt}us");
+                } else {
+                    println!("{rtt},");
+                }
+                // let old = count.fetch_sub(1, Ordering::Relaxed);
+                // println!("Old count value: {old}");
+                count.fetch_sub(1, Ordering::Relaxed);
+                in_transit2.store(false, Ordering::Relaxed);
+            }
+        }
+        if !args.csv {
+            println!("Done receiving");
+        }
+    };
+
+    let ping_out = async move {
+        for i in 1..=args.count {
+            if let Ok(false) =
+                in_transit.compare_exchange_weak(false, true, Ordering::Relaxed, Ordering::Relaxed)
+            {
+                *out_timestamp2.lock().unwrap() = Instant::now();
+                so.write_u32(i).await.unwrap();
+            }
+
+            if !args.csv {
+                println!("Sending ping {i}");
+            }
+            sleep(Duration::from_millis(args.time)).await;
+        }
+        if !args.csv {
+            println!("Done sending pings");
+        }
+    };
+
+    tokio::join!(ping_out, ping_in);
+}
+
+#[derive(Parser, Debug)]
+struct Args {
+    /// Socket address to ping
+    #[arg(long)]
+    address: String,
+
+    /// Amount of pings to send
+    #[arg(short, long)]
+    count: u32,
+
+    /// Time between pings
+    #[arg(short, long)]
+    time: u64,
+
+    /// CSV mode
+    #[arg(long)]
+    csv: bool,
+}

src/bin/ping_server.rs

@@ -0,0 +1,33 @@
+use clap::Parser;
+use std::error::Error;
+use std::net::SocketAddrV4;
+use std::str::FromStr;
+use tokio::io::AsyncWriteExt;
+use tokio::{io, net::TcpListener};
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    let args = Args::parse();
+
+    let addr = SocketAddrV4::from_str(&args.address).unwrap();
+
+    let listener = TcpListener::bind(&addr).await?;
+    println!("Listening on: {addr}");
+
+    loop {
+        let (mut socket, _) = listener.accept().await?;
+
+        tokio::spawn(async move {
+            let (mut si, mut so) = socket.split();
+            io::copy(&mut si, &mut so).await?;
+            so.shutdown().await
+        });
+    }
+}
+
+#[derive(Parser, Debug)]
+struct Args {
+    /// Socket address to listen on
+    #[arg(long)]
+    address: String,
+}

src/lib.rs

@@ -7,6 +7,7 @@ use std::collections::{HashMap, HashSet};
 use std::net::{IpAddr, SocketAddr};
 use std::str::FromStr;
 use std::sync::{Arc, Mutex, RwLock};
+use std::time;
 use tokio::io::{self, AsyncWriteExt};
 use tokio::net::{TcpListener, TcpStream};
 use tokio::sync::watch::{self, Receiver, Sender};
@@ -16,6 +17,7 @@ use uuid::Uuid;
 pub struct ProxyCommand {
     #[serde(flatten)]
     command: Command,
+    timestamp: Option<u64>,
     signature: Option<Signature>,
 }
 
@@ -23,8 +25,34 @@ impl ProxyCommand {
     fn verify_signature(&self, verifying_key: &Option<VerifyingKey>) -> bool {
         match (verifying_key, &self.signature) {
             (Some(key), Some(signature)) => {
-                let message = serde_json::to_string(&self.command).unwrap();
-                key.verify(message.as_bytes(), signature).is_ok()
+                let mut message = serde_json::to_string(&self.command).unwrap();
+
+                let timestamp = if let Some(timestamp) = self.timestamp {
+                    message.push_str(&timestamp.to_string());
+                    time::Duration::from_secs(timestamp)
+                } else {
+                    tracing::debug!("timestamp missing while signature is present");
+                    return false; // timestamp missing with signature present
+                };
+
+                if !key.verify(message.as_bytes(), signature).is_ok() {
+                    tracing::debug!("signature does not match message");
+                    return false; // signature doesn't match
+                }
+
+                let now = time::SystemTime::now()
+                    .duration_since(time::UNIX_EPOCH)
+                    .unwrap();
+                if timestamp > (now + time::Duration::from_secs(30)) {
+                    tracing::warn!("command is more than 30s from the future");
+                    false
+                } else if now - timestamp <= time::Duration::from_secs(60) {
+                    // less than a minute old
+                    true
+                } else {
+                    tracing::warn!("command is more than a minute old");
+                    false
+                }
             }
             (Some(_), None) => false,
             (None, _) => true,
@@ -310,7 +338,10 @@ async fn transfer(
 
 #[cfg(test)]
 mod tests {
-    use std::net::{IpAddr, Ipv4Addr};
+    use std::{
+        net::{IpAddr, Ipv4Addr},
+        time,
+    };
 
     use crate::{Command, ProxyCommand};
     use p384::{
@@ -330,10 +361,12 @@ mod tests {
                 destination_ip: IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
                 id: uuid!("67e55044-10b1-426f-9247-bb680e5fe0c8"),
             },
+            timestamp: Some(8888),
             signature: Some(signature),
         };
         let expected = "{\"create\":{\"incoming_port\":5555,\"destination_port\":6666,\"\
                         destination_ip\":\"127.0.0.1\",\"id\":\"67e55044-10b1-426f-9247-bb680e5fe0c8\"},\
+                        \"timestamp\":8888,\
                         \"signature\":\"\
                             5C912C4B3BFF2ADB49885DCBDB53D6D3041D0632E498CDFF\
                             2114CD2DCAC936AB0901B47C411E5BB57FE77BEF96044940\
@@ -351,9 +384,11 @@ mod tests {
             command: Command::Delete {
                 id: uuid!("67e55044-10b1-426f-9247-bb680e5fe0c8"),
             },
+            timestamp: Some(987654),
             signature: Some(signature),
         };
         let expected = "{\"delete\":{\"id\":\"67e55044-10b1-426f-9247-bb680e5fe0c8\"},\
+                        \"timestamp\":987654,\
                         \"signature\":\"\
                             5C912C4B3BFF2ADB49885DCBDB53D6D3041D0632E498CDFF\
                             2114CD2DCAC936AB0901B47C411E5BB57FE77BEF96044940\
@@ -365,6 +400,11 @@ mod tests {
 
     #[test]
     fn verify_signature() {
+        let subscriber = tracing_subscriber::FmtSubscriber::builder()
+            .with_max_level(tracing::Level::TRACE)
+            .finish();
+        tracing::subscriber::set_global_default(subscriber).unwrap();
+
         let command = Command::Create {
             incoming_port: 4567,
             destination_port: 7654,
@@ -374,12 +414,18 @@ mod tests {
 
         // Create signed message
         let signing_key = SigningKey::random(&mut OsRng);
-        let message = serde_json::to_string(&command).unwrap();
+        let timestamp = time::SystemTime::now()
+            .duration_since(time::UNIX_EPOCH)
+            .unwrap()
+            .as_secs();
+        let mut message = serde_json::to_string(&command).unwrap();
+        message.push_str(&timestamp.to_string());
         let signature: Signature = signing_key.sign(message.as_bytes());
         let bytes = signature.to_bytes();
         assert_eq!(bytes.len(), 96);
         let proxy_command = ProxyCommand {
             command,
+            timestamp: Some(timestamp),
             signature: Some(signature),
         };