feat(ssh): Optimize SSH performance Phase 1-2c + stdin fix
Phase 1: take_payload() optimization - cipher.rs: Added take_payload() to EncryptedPacket - server.rs: Use take_payload() to avoid .to_vec() copy Phase 2a: reuse_buf for CHANNEL_DATA - channel.rs: Added reuse_buf to ExecProcess - handle_channel_data(): Read directly into reuse buffer Phase 2b: read_buf for stdout/stderr - channel.rs: Added read_buf to ExecProcess - poll_exec_stdout_and_client(): Use read_buf for all reads Phase 2c: AES-GCM padding optimization - cipher.rs: Removed padding .to_vec() in AES-GCM decrypt stdin fix: All exec commands use interactive process - channel.rs: Removed conditional rsync/SCP detection - All exec commands now use handle_interactive_exec() - Fixes cat/grep/sed stdin support (small files working) AES-GCM improvements: - cipher.rs: Added CipherMode enum (AES-GCM vs AES-CTR) - cipher.rs: AES-256 key derivation (32 bytes) - cipher.rs: Nonce format follows OpenSSH inc_iv() - kex.rs: Added aes256-gcm@openssh.com to algorithms Performance: ~21% improvement for small files Test: 158 passed, 0 failed Limitation: Large files (>10MB) not working yet (poll loop issue)
This commit is contained in:
Warren
@@ -42,6 +42,8 @@ pub struct ExecProcess {
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pub stdout_fd: RawFd, // ⭐⭐⭐⭐⭐ stdout RawFd（用于poll）
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pub stderr_fd: RawFd, // ⭐⭐⭐⭐⭐ stderr RawFd（用于poll）
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pub command: String, // ⭐⭐⭐⭐⭐ Phase 16.2: 存储exec命令（用于SCP检测）
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pub reuse_buf: Vec<u8>, // Phase 2a: reusable buffer for CHANNEL_DATA content
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pub read_buf: Vec<u8>, // Phase 2b: reusable buffer for stdout/stderr reads (32KB)
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}
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impl ChannelManager {
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@@ -422,29 +424,13 @@ impl ChannelManager {
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info!("Exec command: {}", command);
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// Phase 14: 检测rsync/SCP命令，启动交互式进程
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if command.starts_with("rsync --server") || command.contains("rsync") {
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info!(
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"⭐⭐⭐⭐⭐ [EXEC_REQUEST] Detected rsync command: {}",
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command
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);
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self.handle_rsync_exec(&command, channel)?;
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} else if command.starts_with("scp") || command.contains("scp -") {
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// ⭐⭐⭐⭐⭐ Phase 14.5: SCP命令处理（scp -t destination 或 scp -f source）
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info!(
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"⭐⭐⭐⭐⭐ [EXEC_REQUEST] Detected SCP command: {}",
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command
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);
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self.handle_scp_exec(&command, channel)?;
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} else {
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// Phase 6: 普通命令使用非交互式执行
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let output = self.execute_command(&command)?;
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// 存储输出，等待后续发送CHANNEL_DATA
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if let Some(ch) = self.channels.get_mut(&channel) {
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ch.output_buffer = Some(output);
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}
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}
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// Phase 14: 所有exec命令使用交互式进程（与OpenSSH一致）
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// ⭐⭐⭐⭐⭐ 修复：cat/grep/sed等命令需要stdin数据，必须使用交互式进程
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info!(
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"⭐⭐⭐⭐⭐ [EXEC_REQUEST] Starting interactive process for: {}",
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command
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);
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self.handle_interactive_exec(&command, channel, "exec")?;
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if want_reply {
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Ok(Some(self.build_channel_success(channel)?))
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@@ -503,6 +489,7 @@ impl ChannelManager {
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let stderr = child.stderr.take().ok_or(anyhow!("stderr take failed"))?;
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// ⭐⭐⭐⭐⭐ OpenSSH关键：设置非阻塞模式（fcntl O_NONBLOCK）
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// stdin 保持阻塞模式（write_all 需要阻塞写入）
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let stdout_fd = stdout.as_raw_fd();
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let stderr_fd = stderr.as_raw_fd();
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@@ -525,6 +512,8 @@ impl ChannelManager {
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stdout_fd, // ⭐⭐⭐⭐⭐ RawFd用于poll
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stderr_fd, // ⭐⭐⭐⭐⭐ RawFd用于poll
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command: command.to_string(), // ⭐⭐⭐⭐⭐ Phase 16.2: 存储exec命令（用于SCP检测）
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reuse_buf: Vec::new(), // Phase 2a: reusable buffer
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read_buf: Vec::new(), // Phase 2b: reusable read buffer
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});
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info!(
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"Interactive process stored for channel {} (poll-ready)",
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@@ -700,91 +689,68 @@ impl ChannelManager {
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// 读取recipient channel
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let recipient_channel = cursor.read_u32::<BigEndian>()?;
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// 读取数据（SSH string）
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// 读取数据长度（SSH string — 先读长度，数据稍后读取）
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let data_length = cursor.read_u32::<BigEndian>()?;
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let mut data = vec![0u8; data_length as usize];
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cursor.read_exact(&mut data)?;
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info!(
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"Channel data: channel={}, length={}",
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recipient_channel,
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data.len()
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);
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info!(
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"Channel data content (first 20 bytes): {:?}",
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&data[..std::cmp::min(20, data.len())]
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);
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// Phase 14: 检查是否是交互式exec进程
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// Phase 14: 检查是否是交互式exec进程（用reuse buffer避免分配）
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if let Some(channel) = self.channels.get_mut(&recipient_channel) {
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if let Some(exec_process) = &mut channel.exec_process {
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info!("Interactive exec process detected, forwarding data to stdin");
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info!("Channel data content: {:?}", &data);
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info!("Child PID: {:?}", exec_process.child.id());
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// Phase 2a: read into reusable buffer
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exec_process.reuse_buf.resize(data_length as usize, 0);
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cursor.read_exact(&mut exec_process.reuse_buf)?;
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// 检查子进程状态
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match exec_process.child.try_wait() {
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Ok(Some(status)) => {
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warn!("Child process already exited with status: {:?}", status);
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}
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Ok(None) => {
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info!("Child process still running");
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}
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Err(e) => {
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warn!("Failed to check child status: {}", e);
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}
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}
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info!(
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"Channel data: channel={}, length={}",
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recipient_channel,
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exec_process.reuse_buf.len()
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);
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// 转发数据到子进程stdin（相当于OpenSSH写fdin）
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// 转发数据到子进程stdin
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if let Some(stdin) = &mut exec_process.stdin {
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use std::io::Write;
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info!("⭐⭐⭐⭐⭐ [BEFORE write_all] Forwarding {} bytes to stdin (OpenSSH style)", data.len());
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stdin.write_all(&data)?;
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info!("⭐⭐⭐⭐⭐ [STDIN_WRITE] Writing {} bytes to child stdin", exec_process.reuse_buf.len());
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stdin.write_all(&exec_process.reuse_buf)?;
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stdin.flush()?;
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info!("⭐⭐⭐⭐⭐ [AFTER write_all + flush] Successfully forwarded {} bytes to stdin", data.len());
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info!("⭐⭐⭐⭐⭐ [STDIN_FLUSH] Flushed stdin (channel {})", recipient_channel);
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} else {
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warn!("⚠️⚠️⚠️⚠️⚠️ [STDIN_MISSING] No stdin pipe available for channel {}", recipient_channel);
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}
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// ⭐⭐⭐⭐⭐ ⭐⭐⭐⭐⭐ Critical修复：Window Control - 减少 local_window
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// OpenSSH channel.c: channel_input_data() 中 c->local_window -= data_len
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if let Some(channel) = self.channels.get_mut(&recipient_channel) {
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channel.local_window -= data.len() as u32;
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info!("⭐⭐⭐⭐⭐ [WINDOW_DECREASED] channel {} local_window decreased by {} bytes (new window: {})",
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recipient_channel, data.len(), channel.local_window);
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}
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// Window Control — all in one borrow scope (NLL releases after last use)
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let data_len = exec_process.reuse_buf.len() as u32;
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channel.local_window -= data_len;
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channel.local_consumed += data_len;
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// ⭐⭐⭐⭐⭐ OpenSSH风格：不等待，直接返回None（主循环会通过poll处理stdout）
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info!("stdin forwarded, returning None (main loop will poll stdout/stderr)");
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// No more uses of channel or exec_process after this point
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// ⭐⭐⭐⭐⭐ Phase 15: 更新 local_consumed（跟踪已消费的数据）
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if let Some(channel) = self.channels.get_mut(&recipient_channel) {
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channel.local_consumed += data.len() as u32;
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info!(
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"⭐⭐⭐⭐⭐ [LOCAL_CONSUMED] channel {} consumed {} bytes (total: {})",
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recipient_channel,
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data.len(),
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channel.local_consumed
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);
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// ⭐⭐⭐⭐⭐ Phase 15: 检查窗口并发送 Window adjust
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if let Some(window_adjust_packet) =
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channel_check_window(recipient_channel, &mut self.channels)
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{
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// 返回 window adjust packet（主循环会发送）
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return Ok(Some(window_adjust_packet));
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}
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// 检查窗口并发送 Window adjust
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if let Some(window_adjust_packet) =
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channel_check_window(recipient_channel, &mut self.channels)
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{
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return Ok(Some(window_adjust_packet));
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}
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return Ok(None);
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}
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// 非exec_process路径：分配data（供rsync/SFTP handlers使用）
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let mut data = vec![0u8; data_length as usize];
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cursor.read_exact(&mut data)?;
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info!(
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"Channel data: channel={}, length={}",
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recipient_channel,
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data.len()
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);
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// ⭐⭐⭐⭐⭐ Phase 16.5: rsync in-process handler (no child process)
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if let Some(rsync_handler) = &mut channel.rsync_handler {
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info!(
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"⭐⭐⭐⭐⭐ [RSYNC_DATA] Feeding {} bytes to RsyncHandler",
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data.len()
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);
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let data_clone = data.clone();
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rsync_handler.feed(&data_clone)?;
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rsync_handler.feed(&data)?;
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let output = rsync_handler.drain_output();
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info!(
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@@ -793,7 +759,7 @@ impl ChannelManager {
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rsync_handler.is_done()
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);
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// ⭐⭐⭐⭐⭐ Phase 15: Window Control - decrease local_window
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// Window Control - decrease local_window
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channel.local_window -= data.len() as u32;
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channel.local_consumed += data.len() as u32;
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@@ -1392,14 +1358,14 @@ impl ChannelManager {
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&& (command_str.contains("scp") || command_str.contains("rsync"));
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if let Some(stdout) = &mut exec_process.stdout {
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let mut buffer = vec![0u8; 32768];
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match stdout.read(&mut buffer) {
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exec_process.read_buf.resize(32768, 0);
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match stdout.read(&mut exec_process.read_buf) {
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Ok(n) if n > 0 => {
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info!("Read {} final bytes from stdout (child exited)", n);
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// 构建packet并返回
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let data = exec_process.read_buf[..n].to_vec();
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let packet = self.build_channel_data(
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*channel_id,
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&buffer[..n],
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&data,
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)?;
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return Ok((
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Some(vec![packet]),
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@@ -1490,11 +1456,11 @@ impl ChannelManager {
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// 读取剩余stdout
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if let Some(stdout) = &mut exec_process.stdout {
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let mut buffer = vec![0u8; 32768];
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match stdout.read(&mut buffer) {
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exec_process.read_buf.resize(32768, 0);
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match stdout.read(&mut exec_process.read_buf) {
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Ok(n) if n > 0 => {
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let packet =
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self.build_channel_data(*channel_id, &buffer[..n])?;
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let data = exec_process.read_buf[..n].to_vec();
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let packet = self.build_channel_data(*channel_id, &data)?;
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return Ok((Some(vec![packet]), false, true));
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}
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_ => {}
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@@ -1558,12 +1524,12 @@ impl ChannelManager {
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channel_id
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);
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if let Some(stdout) = &mut exec_process.stdout {
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let mut buffer = vec![0u8; 32768];
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exec_process.read_buf.resize(32768, 0);
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info!("⭐⭐⭐⭐⭐ [BEFORE stdout.read] Attempting to read from stdout (buffer size 32KB)");
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match stdout.read(&mut buffer) {
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match stdout.read(&mut exec_process.read_buf) {
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Ok(n) if n > 0 => {
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info!("⭐⭐⭐⭐⭐ [AFTER stdout.read] Read {} bytes from stdout (channel {})", n, channel_id);
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packets_data.push((channel_id, buffer[..n].to_vec()));
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packets_data.push((channel_id, exec_process.read_buf[..n].to_vec()));
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}
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Ok(0) => {
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info!(
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@@ -1588,17 +1554,17 @@ impl ChannelManager {
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if revents.contains(PollFlags::POLLIN) {
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info!("stderr fd has data (channel {})", channel_id);
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if let Some(stderr) = &mut exec_process.stderr {
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exec_process.read_buf.resize(32768, 0);
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info!("⭐⭐⭐⭐⭐ [BEFORE stderr.read] Attempting to read from stderr (buffer size 32KB)");
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let mut buffer = vec![0u8; 32768];
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match stderr.read(&mut buffer) {
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match stderr.read(&mut exec_process.read_buf) {
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Ok(n) if n > 0 => {
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info!("⭐⭐⭐⭐⭐ [AFTER stderr.read] Read {} bytes from stderr (channel {})", n, channel_id);
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info!(
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"⭐⭐⭐⭐⭐ stderr content: {:?}",
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&buffer[..std::cmp::min(50, n)]
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&exec_process.read_buf[..std::cmp::min(50, n)]
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);
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// ⭐⭐⭐⭐⭐ Phase 17: stderr → SSH_MSG_CHANNEL_EXTENDED_DATA (data_type=1)
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stderr_packets.push((channel_id, buffer[..n].to_vec()));
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stderr_packets.push((channel_id, exec_process.read_buf[..n].to_vec()));
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}
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Ok(0) => {
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info!(
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@@ -1779,24 +1745,18 @@ impl ChannelManager {
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if let Some(revents) = poll_fds_vec[stdout_idx].revents() {
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if revents.contains(PollFlags::POLLIN) {
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info!("stdout fd has data (channel {})", channel_id);
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// ⭐⭐⭐⭐⭐ 非阻塞读取（因为设置了O_NONBLOCK）
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if let Some(stdout) = &mut exec_process.stdout {
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let mut buffer = vec![0u8; 32768];
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match stdout.read(&mut buffer) {
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exec_process.read_buf.resize(32768, 0);
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match stdout.read(&mut exec_process.read_buf) {
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Ok(n) => {
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if n > 0 {
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info!(
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"Read {} bytes from stdout (channel {})",
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n, channel_id
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);
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packets_data.push((channel_id, buffer[..n].to_vec()));
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info!("Read {} bytes from stdout (channel {})", n, channel_id);
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packets_data.push((channel_id, exec_process.read_buf[..n].to_vec()));
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} else {
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info!("stdout EOF (channel {})", channel_id);
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}
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}
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Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {
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// 非阻塞模式，没有数据（正常）
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}
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Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {}
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Err(e) => {
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warn!("stdout read error: {}", e);
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}
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@@ -1805,27 +1765,21 @@ impl ChannelManager {
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}
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}
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// 检查stderr是否有数据（类似处理）
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if let Some(revents) = poll_fds_vec[stderr_idx].revents() {
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if revents.contains(PollFlags::POLLIN) {
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info!("stderr fd has data (channel {})", channel_id);
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if let Some(stderr) = &mut exec_process.stderr {
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let mut buffer = vec![0u8; 32768];
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match stderr.read(&mut buffer) {
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exec_process.read_buf.resize(32768, 0);
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match stderr.read(&mut exec_process.read_buf) {
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Ok(n) => {
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if n > 0 {
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info!(
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"Read {} bytes from stderr (channel {})",
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n, channel_id
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);
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packets_data.push((channel_id, buffer[..n].to_vec()));
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info!("Read {} bytes from stderr (channel {})", n, channel_id);
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packets_data.push((channel_id, exec_process.read_buf[..n].to_vec()));
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} else {
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info!("stderr EOF (channel {})", channel_id);
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}
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}
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Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {
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// 非阻塞模式，没有数据（正常）
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}
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Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {}
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Err(e) => {
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warn!("stderr read error: {}", e);
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}
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Reference in New Issue
Block a user