prevent server fault on handshake issues, fix size conditions, begin response implementation

src/main.rs

@@ -4,11 +4,12 @@ mod storage;
 use anyhow::Result;
 use argument::Argument;
 
-use native_tls::{Identity, TlsAcceptor, TlsStream};
+use native_tls::{HandshakeError, Identity, TlsAcceptor, TlsStream};
 use std::{
     fs::File,
     io::{Read, Write},
     net::{SocketAddr, TcpListener, TcpStream},
+    os::unix::fs::FileExt,
     sync::Arc,
     thread,
     time::{SystemTime, UNIX_EPOCH},
@@ -40,8 +41,8 @@ fn main() -> Result<()> {
                 thread::spawn({
                     let argument = argument.clone();
                     let peer = stream.peer_addr()?;
-                    let mut stream = acceptor.accept(stream)?;
-                    move || handle(argument, peer, &mut stream)
+                    let connection = acceptor.accept(stream);
+                    move || handle(argument, peer, connection)
                 });
             }
             Err(e) => println!("[{}] [error] {e}", now()),
@@ -50,23 +51,29 @@ fn main() -> Result<()> {
     Ok(())
 }
 
-fn handle(argument: Arc<Argument>, peer: SocketAddr, stream: &mut TlsStream<TcpStream>) {
+fn handle(
+    argument: Arc<Argument>,
+    peer: SocketAddr,
+    connection: Result<TlsStream<TcpStream>, HandshakeError<TcpStream>>,
+) {
     use titanite::*;
     //println!("[{}] [info] [{peer}] New connection", now());
+    match connection {
+        Ok(mut stream) => {
             let mut input = vec![0; titanite::HEADER_MAX_LEN];
             match stream.read(&mut input) {
                 Ok(0) => println!("[{}] [warning] [{peer}] Peer closed connection", now()),
                 Ok(s) => match Request::from_bytes(&input[..s]) {
                     Ok(request) => match request {
-                Request::Gemini(this) => gemini(this, argument, peer, stream),
-                Request::Titan(this) => titan(this, argument, peer, stream),
+                        Request::Gemini(this) => gemini(this, argument, peer, &mut stream),
+                        Request::Titan(this) => titan(this, argument, peer, &mut stream),
                     },
                     Err(e) => send(
                         &response::failure::temporary::General {
                             message: Some("Internal server error".to_string()),
                         }
                         .into_bytes(),
-                stream,
+                        &mut stream,
                         |result| match result {
                             Ok(()) => println!("[{}] [warning] [{peer}] {e}", now()),
                             Err(e) => println!("[{}] [error] [{peer}] {e}", now()),
@@ -78,13 +85,16 @@ fn handle(argument: Arc<Argument>, peer: SocketAddr, stream: &mut TlsStream<TcpS
                         message: Some("Internal server error".to_string()),
                     }
                     .into_bytes(),
-            stream,
+                    &mut stream,
                     |result| match result {
                         Ok(()) => println!("[{}] [warning] [{peer}] {e}", now()),
                         Err(e) => println!("[{}] [error] [{peer}] {e}", now()),
                     },
                 ),
             }
+        }
+        Err(e) => println!("[{}] [warning] [{peer}] Handshake issue: {e}", now()),
+    }
 }
 
 fn gemini(
@@ -94,19 +104,34 @@ fn gemini(
     stream: &mut TlsStream<TcpStream>,
 ) {
     use titanite::*;
+    println!("[{}] [info] [{peer}] Request: {}", now(), gemini.url);
     match storage::Item::from_url(gemini.url.as_str(), &argument.directory) {
-        Ok(item) => send(
+        Ok(item) => {
+            let mut read: usize = 0;
+            match stream.write_all(
                 &response::success::Default {
                     mime: item.mime,
-                //data: item.file.read(vec![1000]),
+                    data: &[], // init empty
                 }
                 .into_bytes(),
-            stream,
-            |result| match result {
-                Ok(()) => println!("[{}] [info] [{peer}] Request: {}", now(), gemini.url),
-                Err(e) => println!("[{}] [error] [{peer}] {e}", now()),
+            ) {
+                Ok(()) => loop {
+                    let mut data = vec![0; argument.chunk];
+                    let l = item.file.read_at(&mut data, read as u64).unwrap();
+                    stream.write_all(&data[..l]).unwrap();
+                    read += l;
+                    println!("[{}] [info] [{peer}] Chunk sent: {l} ({read} total)", now());
+                    // EOF
+                    if l == 0 {
+                        stream.flush().unwrap();
+                        stream.shutdown().unwrap();
+                        println!("[{}] [info] [{peer}] Response: {read} bytes", now());
+                        break;
+                    }
                 },
-        ),
+                Err(e) => println!("[{}] [error] [{peer}] {e}", now()),
+            }
+        }
         Err(e) => send(
             &response::failure::permanent::NotFound {
                 message: Some("Not found".to_string()),
@@ -184,7 +209,7 @@ fn titan(
                     }
 
                     // validate client-side limits (from header)
-                    if titan.size > total {
+                    if total > titan.size {
                         if let Err(e) = tmp.delete() {
                             println!("[{}] [error] [{peer}] {e}", now());
                         }
@@ -227,7 +252,7 @@ fn titan(
                             }
 
                             // just to make sure
-                            if titan.size > total {
+                            if total > titan.size {
                                 panic!()
                             }