feat: Add SSH jump host (-J) infrastructure and CLI integration

.gitignore

@@ -24,3 +24,4 @@ Thumbs.db
 .claude/
 .gemini/
 references/
+vendor/

README.md

@@ -12,6 +12,7 @@ A high-performance SSH client with **SSH-compatible syntax** for both single-hos
 ## Features
 
 - **SSH Compatibility**: Drop-in replacement for SSH with compatible command-line syntax
+- **Jump Host Support**: Connect through bastion hosts using OpenSSH ProxyJump syntax (`-J`)
 - **Parallel Execution**: Execute commands across multiple nodes simultaneously
 - **Cluster Management**: Define and manage node clusters via configuration files
 - **Progress Tracking**: Real-time progress indicators for each node
@@ -98,6 +99,24 @@ bssh -o StrictHostKeyChecking=no user@host
 bssh -Q cipher
 ```
 
+### Jump Host Support (ProxyJump)
+```bash
+# Connect through a single jump host (bastion)
+bssh -J jump@bastion.example.com user@internal-server
+
+# Multiple jump hosts (connection chain)
+bssh -J "jump1@proxy1,jump2@proxy2" user@final-destination
+
+# Jump host with custom port
+bssh -J admin@bastion:2222 user@internal-host
+
+# IPv6 jump host
+bssh -J "[2001:db8::1]:22" user@destination
+
+# Combine with cluster operations
+bssh -J bastion.example.com -C production "uptime"
+```
+
 ### Multi-Server Mode (Cluster Operations)
 ```bash
 # Using direct host specification

src/cli.rs

@@ -82,6 +82,13 @@ pub struct Cli {
     )]
     pub password: bool,
 
+    #[arg(
+        short = 'J',
+        long = "jump-host",
+        help = "Comma-separated list of jump hosts (ProxyJump)\nSpecify in [user@]hostname[:port] format, e.g.: 'jump1.example.com' or 'user@jump1:2222,jump2'\nSupports multiple hops for complex network topologies"
+    )]
+    pub jump_hosts: Option<String>,
+
     #[arg(
         long = "parallel",
         default_value = "10",
@@ -160,14 +167,6 @@ pub struct Cli {
     )]
     pub no_tty: bool,
 
-    #[arg(
-        short = 'J',
-        long = "jump",
-        value_name = "destination",
-        help = "Connect via jump host(s) (ProxyJump)"
-    )]
-    pub jump_hosts: Option<String>,
-
     #[arg(short = 'x', long = "no-x11", help = "Disable X11 forwarding")]
     pub no_x11: bool,
 

src/commands/exec.rs

@@ -32,6 +32,7 @@ pub struct ExecuteCommandParams<'a> {
     pub use_password: bool,
     pub output_dir: Option<&'a Path>,
     pub timeout: Option<u64>,
+    pub jump_hosts: Option<&'a str>,
 }
 
 pub async fn execute_command(params: ExecuteCommandParams<'_>) -> Result<()> {
@@ -49,7 +50,8 @@ pub async fn execute_command(params: ExecuteCommandParams<'_>) -> Result<()> {
         params.use_agent,
         params.use_password,
     )
-    .with_timeout(params.timeout);
+    .with_timeout(params.timeout)
+    .with_jump_hosts(params.jump_hosts.map(|s| s.to_string()));
 
     let results = executor.execute(params.command).await?;
 

src/config.rs

@@ -720,11 +720,22 @@ mod tests {
 
     #[test]
     fn test_expand_tilde() {
-        unsafe {
-            std::env::set_var("HOME", "/home/user");
-        }
+        // Save original HOME value
+        let original_home = std::env::var("HOME").ok();
+
+        // Set test HOME value
+        std::env::set_var("HOME", "/home/user");
+
         let path = Path::new("~/.ssh/config");
         let expanded = expand_tilde(path);
+
+        // Restore original HOME value
+        if let Some(home) = original_home {
+            std::env::set_var("HOME", home);
+        } else {
+            std::env::remove_var("HOME");
+        }
+
         assert_eq!(expanded, PathBuf::from("/home/user/.ssh/config"));
     }