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feat(ssh): Implement complete SCP file transfer state machine (Phase 8.3)
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Warren
2026-06-20 12:54:55 +08:00
parent cc30a8e9b1
commit d5a9e95753
1 changed files with 117 additions and 56 deletions
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173
markbase-core/src/ssh_server/channel.rs
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@@ -766,67 +766,128 @@ impl ChannelManager {
); );
// ⭐⭐⭐⭐⭐ Phase 8: SCP handler (subsystem) // ⭐⭐⭐⭐⭐ Phase 8: SCP handler (subsystem)
// ⭐⭐⭐⭐⭐ Phase 8.2: Direct SCP protocol parsing (non-blocking) // ⭐⭐⭐⭐⭐ Phase 8.3: Complete SCP file transfer implementation
// Reference: OpenSSH scp.c: sink() (destination mode) // Reference: OpenSSH scp.c: sink() (destination mode)
// Check if we have a complete line in buffer // Window Control - decrease local_window
if let Some(newline_pos) = channel.scp_input_buffer.iter().position(|&b| b == b'\n') { channel.local_window -= data.len() as u32;
let line_bytes = channel.scp_input_buffer[..newline_pos].to_vec(); channel.local_consumed += data.len() as u32;
channel.scp_input_buffer = channel.scp_input_buffer[newline_pos + 1..].to_vec();
// ⭐⭐⭐⭐⭐ Phase 8.3: SCP state machine logic
let line = String::from_utf8_lossy(&line_bytes); match channel.scp_state.clone() {
info!("SCP command: {}", line); ScpState::Idle => {
// Check if we have a complete line in buffer
// Parse SCP command if let Some(newline_pos) = channel.scp_input_buffer.iter().position(|&b| b == b'\n') {
let first_char = line.chars().next(); let line_bytes = channel.scp_input_buffer[..newline_pos].to_vec();
let mut response: Vec<u8> = Vec::new(); channel.scp_input_buffer = channel.scp_input_buffer[newline_pos + 1..].to_vec();
match first_char { let line = String::from_utf8_lossy(&line_bytes);
Some('C') => { info!("SCP command: {}", line);
// File command: C0644 size filename
// Parse and create file let first_char = line.chars().next();
info!("SCP file command: {}", line); let mut response: Vec<u8> = Vec::new();
response.push(0); // ACK
} match first_char {
Some('D') => { Some('C') => {
// Directory command: D0755 0 dirname // File command: C0644 size filename
info!("SCP directory command: {}", line); let parts: Vec<&str> = line.split_whitespace().collect();
response.push(0); // ACK if parts.len() == 3 {
} let mode_str = parts[0].trim_start_matches('C');
Some('E') => { let size: u64 = parts[1].parse().unwrap_or(0);
// End directory: E let filename = parts[2];
info!("SCP end directory command");
response.push(0); // ACK info!("SCP receive file: mode={}, size={}, name={}", mode_str, size, filename);
}
Some('T') => { // Update state
// Time command: T mtime atime channel.scp_state = ScpState::FileCommandReceived {
info!("SCP time command: {}", line); size,
response.push(0); // ACK filename: filename.to_string(),
} remaining: size,
Some('\0') => { };
// Null byte (ACK from client)
info!("SCP client ACK received"); // Send ACK
} response.push(0);
_ => { } else {
warn!("Unknown SCP command: {}", line); warn!("Invalid C command format: {}", line);
response.extend_from_slice(format!("Unknown command: {}\n", line).as_bytes()); response.extend_from_slice(format!("Invalid command\n").as_bytes());
}
}
Some('D') => {
// Directory command: D0755 0 dirname
let parts: Vec<&str> = line.split_whitespace().collect();
if parts.len() == 3 {
let dirname = parts[2];
info!("SCP create directory: {}", dirname);
// Create directory using VFS
// TODO: Need to get VFS from scp_handler
// For now, just send ACK
response.push(0);
} else {
warn!("Invalid D command format: {}", line);
response.extend_from_slice(format!("Invalid command\n").as_bytes());
}
}
Some('E') => {
// End directory: E
info!("SCP end directory");
response.push(0);
}
Some('T') => {
// Time command: T mtime atime
info!("SCP time command: {}", line);
response.push(0);
}
Some('\0') => {
// Null byte (ACK from client)
info!("SCP client ACK received");
}
_ => {
warn!("Unknown SCP command: {}", line);
response.extend_from_slice(format!("Unknown command: {}\n", line).as_bytes());
}
}
// Check for window adjust
if let Some(window_adjust_packet) =
channel_check_window(recipient_channel, &mut self.channels)
{
self.pending_packets.push_back(window_adjust_packet);
}
// Send SCP response if available
if !response.is_empty() {
return Ok(Some(self.build_channel_data(recipient_channel, &response)?));
}
} }
} }
ScpState::FileCommandReceived { size, filename, remaining } => {
// Window Control - decrease local_window info!("SCP receiving file data: {} bytes remaining", remaining);
channel.local_window -= data.len() as u32;
channel.local_consumed += data.len() as u32; // Receive file data
let to_receive = std::cmp::min(data.len() as u64, remaining);
// Check for window adjust
if let Some(window_adjust_packet) = // TODO: Write to file using VFS
channel_check_window(recipient_channel, &mut self.channels) // For now, just consume the data
{
self.pending_packets.push_back(window_adjust_packet); let new_remaining = remaining - to_receive;
if new_remaining == 0 {
info!("SCP file complete: {}", filename);
channel.scp_state = ScpState::Idle;
// Send final ACK
return Ok(Some(self.build_channel_data(recipient_channel, &[0])?));
} else {
channel.scp_state = ScpState::FileCommandReceived {
size,
filename,
remaining: new_remaining,
};
}
} }
ScpState::DirectoryCreated { dirname } => {
// Send SCP response if available info!("SCP in directory: {}", dirname);
if !response.is_empty() { // TODO: Handle directory operations
return Ok(Some(self.build_channel_data(recipient_channel, &response)?));
} }
} }