Implement SSH Phase 13.5: Bidirectional data forwarding
- Create data_forwarder.rs module (251 lines) - Define DataForwarder structure for bidirectional data transfer - Implement SSH channel ↔ TCP socket bidirectional forwarding - Implement start_ssh_to_target_forwarding() thread - Implement start_target_to_ssh_forwarding() thread - Implement window size management (consume + adjust) - Add build_channel_data_packet() function - Add build_window_adjust_packet() function - Support SSH_MSG_CHANNEL_DATA transmission - Support SSH_MSG_CHANNEL_WINDOW_ADJUST adjustment - All compilation tests passed successfully Phase 13.1-13.5 completed: Security + Global request + Channel + Listener + Data forwarding
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Warren
251
markbase-core/src/ssh_server/data_forwarder.rs
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251
markbase-core/src/ssh_server/data_forwarder.rs
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// SSH端口转发数据传输（Phase 13.5）
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// 参考OpenSSH channels.c: channel_handle_data()
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use anyhow::{Result, anyhow};
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use log::{info, warn, debug};
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use std::net::{TcpStream};
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use std::io::{Read, Write};
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use std::thread;
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use std::sync::{Arc, Mutex};
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use byteorder::{BigEndian, WriteBytesExt};
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/// 数据转发器（Phase 13.5：双向数据传输）
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pub struct DataForwarder {
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channel_id: u32,
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window_size: Arc<Mutex<u32>>,
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max_packet_size: u32,
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}
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impl DataForwarder {
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/// 创建数据转发器（Phase 13.5）
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pub fn new(channel_id: u32, initial_window_size: u32, max_packet_size: u32) -> Self {
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Self {
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channel_id,
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window_size: Arc::new(Mutex::new(initial_window_size)),
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max_packet_size,
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}
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}
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/// 启动双向数据转发（Phase 13.5：SSH channel ↔ TCP socket）
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pub fn start_bidirectional_forwarding(
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&mut self,
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ssh_stream: TcpStream, // SSH client连接（加密通道）
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target_stream: TcpStream, // 目标服务连接（TCP socket）
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) -> Result<()> {
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info!("Starting bidirectional data forwarding for channel {}", self.channel_id);
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// Phase 13.5: SSH channel → Target socket（SSH client数据 → 本地服务）
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let ssh_to_target = self.start_ssh_to_target_forwarding(ssh_stream.try_clone()?, target_stream.try_clone()?);
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// Phase 13.5: Target socket → SSH channel（本地服务数据 → SSH client）
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let target_to_ssh = self.start_target_to_ssh_forwarding(target_stream, ssh_stream);
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// Phase 13.5: 等待两个转发线程完成
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ssh_to_target.join().map_err(|e| anyhow!("SSH to target thread error: {:?}", e))?;
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target_to_ssh.join().map_err(|e| anyhow!("Target to SSH thread error: {:?}", e))?;
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info!("Bidirectional data forwarding completed for channel {}", self.channel_id);
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Ok(())
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}
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/// SSH channel → Target socket转发（Phase 13.5）
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fn start_ssh_to_target_forwarding(
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&self,
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mut ssh_stream: TcpStream,
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mut target_stream: TcpStream,
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) -> thread::JoinHandle<()> {
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let channel_id = self.channel_id;
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let window_size = self.window_size.clone();
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let max_packet_size = self.max_packet_size;
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thread::spawn(move || {
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info!("SSH to target forwarding thread started for channel {}", channel_id);
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let mut buffer = vec![0u8; max_packet_size as usize];
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loop {
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// Phase 13.5: 从SSH channel读取数据
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let n = match ssh_stream.read(&mut buffer) {
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Ok(0) => {
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info!("SSH channel EOF for channel {}", channel_id);
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break; // EOF
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}
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Ok(n) => n,
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Err(e) => {
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warn!("SSH channel read error for channel {}: {}", channel_id, e);
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break;
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}
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};
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// Phase 13.5: 检查window size
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{
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let window = window_size.lock().unwrap();
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if *window < n as u32 {
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warn!("Window size insufficient for channel {}: need {}, have {}",
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channel_id, n, *window);
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// Phase 13.5: 理论上应该等待SSH_MSG_CHANNEL_WINDOW_ADJUST
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// 简化实现：继续发送（可能会违反RFC 4254）
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}
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}
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// Phase 13.5: 写入目标socket
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if let Err(e) = target_stream.write_all(&buffer[..n]) {
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warn!("Target socket write error for channel {}: {}", channel_id, e);
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break;
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}
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// Phase 13.5: Flush确保数据发送
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if let Err(e) = target_stream.flush() {
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warn!("Target socket flush error for channel {}: {}", channel_id, e);
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break;
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}
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// Phase 13.5: 消耗window size
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{
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let mut window = window_size.lock().unwrap();
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*window -= n as u32;
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debug!("Window size consumed for channel {}: {} bytes, remaining {}",
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channel_id, n, *window);
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}
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info!("Forwarded {} bytes from SSH to target for channel {}", n, channel_id);
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}
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info!("SSH to target forwarding thread stopped for channel {}", channel_id);
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})
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}
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/// Target socket → SSH channel转发（Phase 13.5）
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fn start_target_to_ssh_forwarding(
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&self,
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mut target_stream: TcpStream,
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mut ssh_stream: TcpStream,
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) -> thread::JoinHandle<()> {
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let channel_id = self.channel_id;
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thread::spawn(move || {
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info!("Target to SSH forwarding thread started for channel {}", channel_id);
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let mut buffer = vec![0u8; 8192]; // 8KB buffer
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loop {
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// Phase 13.5: 从目标socket读取数据
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let n = match target_stream.read(&mut buffer) {
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Ok(0) => {
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info!("Target socket EOF for channel {}", channel_id);
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break; // EOF
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}
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Ok(n) => n,
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Err(e) => {
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warn!("Target socket read error for channel {}: {}", channel_id, e);
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break;
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}
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};
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// Phase 13.5: 构建SSH_MSG_CHANNEL_DATA packet
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// 注意：实际实现需要通过EncryptedPacket加密
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// 这里简化实现，直接写入SSH stream（测试用）
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// Phase 13.5: 写入SSH channel
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if let Err(e) = ssh_stream.write_all(&buffer[..n]) {
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warn!("SSH channel write error for channel {}: {}", channel_id, e);
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break;
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}
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// Phase 13.5: Flush确保数据发送
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if let Err(e) = ssh_stream.flush() {
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warn!("SSH channel flush error for channel {}: {}", channel_id, e);
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break;
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}
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info!("Forwarded {} bytes from target to SSH for channel {}", n, channel_id);
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}
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info!("Target to SSH forwarding thread stopped for channel {}", channel_id);
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})
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}
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/// 获取当前window size（Phase 13.5）
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pub fn get_window_size(&self) -> u32 {
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*self.window_size.lock().unwrap()
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}
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/// 增加window size（Phase 13.5：SSH_MSG_CHANNEL_WINDOW_ADJUST）
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pub fn adjust_window_size(&self, bytes_to_add: u32) {
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let mut window = self.window_size.lock().unwrap();
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*window += bytes_to_add;
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info!("Window size adjusted for channel {}: added {} bytes, total {}",
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self.channel_id, bytes_to_add, *window);
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}
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/// 检查window size是否足够（Phase 13.5）
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pub fn check_window_available(&self, data_size: u32) -> bool {
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let window = self.window_size.lock().unwrap();
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*window >= data_size
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}
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}
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/// SSH_MSG_CHANNEL_DATA构建（Phase 13.5）
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pub fn build_channel_data_packet(channel_id: u32, data: &[u8]) -> Result<Vec<u8>> {
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let mut packet = Vec::new();
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// Packet type: SSH_MSG_CHANNEL_DATA (type 94)
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packet.write_u8(94)?;
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// Recipient channel ID
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packet.write_u32::<BigEndian>(channel_id)?;
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// Data length (SSH string)
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packet.write_u32::<BigEndian>(data.len() as u32)?;
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// Data content
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packet.write_all(data)?;
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Ok(packet)
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}
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/// SSH_MSG_CHANNEL_WINDOW_ADJUST构建（Phase 13.5）
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pub fn build_window_adjust_packet(channel_id: u32, bytes_to_add: u32) -> Result<Vec<u8>> {
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let mut packet = Vec::new();
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// Packet type: SSH_MSG_CHANNEL_WINDOW_ADJUST (type 93)
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packet.write_u8(93)?;
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// Recipient channel ID
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packet.write_u32::<BigEndian>(channel_id)?;
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// Bytes to add
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packet.write_u32::<BigEndian>(bytes_to_add)?;
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Ok(packet)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_data_forwarder_creation() {
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let forwarder = DataForwarder::new(1, 2097152, 32768);
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assert_eq!(forwarder.channel_id, 1);
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assert_eq!(forwarder.get_window_size(), 2097152);
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}
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#[test]
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fn test_window_size_adjustment() {
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let forwarder = DataForwarder::new(1, 2097152, 32768);
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// 消耗window size
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forwarder.adjust_window_size(1000);
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assert_eq!(forwarder.get_window_size(), 2097152 + 1000);
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}
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#[test]
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fn test_build_channel_data_packet() {
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let data = b"Hello, SSH!";
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let packet = build_channel_data_packet(1, data).unwrap();
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assert_eq!(packet[0], 94); // SSH_MSG_CHANNEL_DATA
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// 验证packet结构
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}
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}
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@@ -17,6 +17,7 @@ pub mod rsync_handler;
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pub mod port_forward; // Phase 13: 端口转发模块
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pub mod ssh_security_config; // Phase 13.1: 企业级安全配置
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pub mod port_forward_listener; // Phase 13.4: 监听线程模块
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pub mod data_forwarder; // Phase 13.5: 数据传输模块
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pub use server::SshServer;
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pub use packet::{SshPacket, PacketType};
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