feat(ssh): Implement complete SCP file transfer state machine (Phase 8.3)
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Warren
@@ -766,67 +766,128 @@ impl ChannelManager {
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// ⭐⭐⭐⭐⭐ Phase 8: SCP handler (subsystem)
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// ⭐⭐⭐⭐⭐ Phase 8.2: Direct SCP protocol parsing (non-blocking)
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// ⭐⭐⭐⭐⭐ Phase 8.3: Complete SCP file transfer implementation
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// Reference: OpenSSH scp.c: sink() (destination mode)
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// Check if we have a complete line in buffer
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if let Some(newline_pos) = channel.scp_input_buffer.iter().position(|&b| b == b'\n') {
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let line_bytes = channel.scp_input_buffer[..newline_pos].to_vec();
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channel.scp_input_buffer = channel.scp_input_buffer[newline_pos + 1..].to_vec();
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let line = String::from_utf8_lossy(&line_bytes);
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info!("SCP command: {}", line);
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// Parse SCP command
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let first_char = line.chars().next();
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let mut response: Vec<u8> = Vec::new();
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match first_char {
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Some('C') => {
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// File command: C0644 size filename
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// Parse and create file
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info!("SCP file command: {}", line);
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response.push(0); // ACK
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}
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Some('D') => {
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// Directory command: D0755 0 dirname
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info!("SCP directory command: {}", line);
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response.push(0); // ACK
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}
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Some('E') => {
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// End directory: E
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info!("SCP end directory command");
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response.push(0); // ACK
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}
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Some('T') => {
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// Time command: T mtime atime
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info!("SCP time command: {}", line);
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response.push(0); // ACK
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}
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Some('\0') => {
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// Null byte (ACK from client)
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info!("SCP client ACK received");
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}
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_ => {
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warn!("Unknown SCP command: {}", line);
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response.extend_from_slice(format!("Unknown command: {}\n", line).as_bytes());
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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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// ⭐⭐⭐⭐⭐ Phase 8.3: SCP state machine logic
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match channel.scp_state.clone() {
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ScpState::Idle => {
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// Check if we have a complete line in buffer
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if let Some(newline_pos) = channel.scp_input_buffer.iter().position(|&b| b == b'\n') {
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let line_bytes = channel.scp_input_buffer[..newline_pos].to_vec();
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channel.scp_input_buffer = channel.scp_input_buffer[newline_pos + 1..].to_vec();
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let line = String::from_utf8_lossy(&line_bytes);
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info!("SCP command: {}", line);
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let first_char = line.chars().next();
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let mut response: Vec<u8> = Vec::new();
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match first_char {
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Some('C') => {
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// File command: C0644 size filename
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let parts: Vec<&str> = line.split_whitespace().collect();
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if parts.len() == 3 {
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let mode_str = parts[0].trim_start_matches('C');
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let size: u64 = parts[1].parse().unwrap_or(0);
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let filename = parts[2];
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info!("SCP receive file: mode={}, size={}, name={}", mode_str, size, filename);
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// Update state
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channel.scp_state = ScpState::FileCommandReceived {
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size,
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filename: filename.to_string(),
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remaining: size,
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};
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// Send ACK
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response.push(0);
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} else {
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warn!("Invalid C command format: {}", line);
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response.extend_from_slice(format!("Invalid command\n").as_bytes());
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}
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}
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Some('D') => {
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// Directory command: D0755 0 dirname
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let parts: Vec<&str> = line.split_whitespace().collect();
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if parts.len() == 3 {
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let dirname = parts[2];
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info!("SCP create directory: {}", dirname);
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// Create directory using VFS
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// TODO: Need to get VFS from scp_handler
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// For now, just send ACK
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response.push(0);
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} else {
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warn!("Invalid D command format: {}", line);
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response.extend_from_slice(format!("Invalid command\n").as_bytes());
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}
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}
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Some('E') => {
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// End directory: E
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info!("SCP end directory");
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response.push(0);
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}
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Some('T') => {
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// Time command: T mtime atime
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info!("SCP time command: {}", line);
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response.push(0);
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}
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Some('\0') => {
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// Null byte (ACK from client)
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info!("SCP client ACK received");
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}
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_ => {
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warn!("Unknown SCP command: {}", line);
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response.extend_from_slice(format!("Unknown command: {}\n", line).as_bytes());
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}
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}
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// Check for 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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self.pending_packets.push_back(window_adjust_packet);
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}
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// Send SCP response if available
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if !response.is_empty() {
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return Ok(Some(self.build_channel_data(recipient_channel, &response)?));
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}
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}
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}
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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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// Check for 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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self.pending_packets.push_back(window_adjust_packet);
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ScpState::FileCommandReceived { size, filename, remaining } => {
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info!("SCP receiving file data: {} bytes remaining", remaining);
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// Receive file data
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let to_receive = std::cmp::min(data.len() as u64, remaining);
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// TODO: Write to file using VFS
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// For now, just consume the data
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let new_remaining = remaining - to_receive;
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if new_remaining == 0 {
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info!("SCP file complete: {}", filename);
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channel.scp_state = ScpState::Idle;
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// Send final ACK
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return Ok(Some(self.build_channel_data(recipient_channel, &[0])?));
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} else {
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channel.scp_state = ScpState::FileCommandReceived {
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size,
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filename,
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remaining: new_remaining,
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};
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}
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}
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// Send SCP response if available
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if !response.is_empty() {
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return Ok(Some(self.build_channel_data(recipient_channel, &response)?));
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ScpState::DirectoryCreated { dirname } => {
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info!("SCP in directory: {}", dirname);
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// TODO: Handle directory operations
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}
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}
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