Initial commit: kport - SSH Port Forwarder TUI

- Interactive TUI for SSH port forwarding
- Reads from ~/.ssh/config for host selection
- Automatic port detection on remote hosts
- Manual port forwarding option
- Graceful error handling and connection timeouts
- Built with Bubble Tea framework

Co-authored-by: Ona <no-reply@ona.com>

ssh_config.go

@@ -0,0 +1,125 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// SSHHost represents an SSH host configuration
+type SSHHost struct {
+	Name     string
+	Hostname string
+	User     string
+	Port     string
+	Identity string
+}
+
+// SSHConfig handles parsing SSH configuration
+type SSHConfig struct {
+	Hosts []SSHHost
+}
+
+// NewSSHConfig creates a new SSH config parser
+func NewSSHConfig() *SSHConfig {
+	return &SSHConfig{
+		Hosts: make([]SSHHost, 0),
+	}
+}
+
+// LoadConfig loads SSH configuration from the default location
+func (sc *SSHConfig) LoadConfig() error {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return fmt.Errorf("failed to get home directory: %w", err)
+	}
+
+	configPath := filepath.Join(homeDir, ".ssh", "config")
+	return sc.LoadConfigFromFile(configPath)
+}
+
+// LoadConfigFromFile loads SSH configuration from a specific file
+func (sc *SSHConfig) LoadConfigFromFile(path string) error {
+	file, err := os.Open(path)
+	if err != nil {
+		return fmt.Errorf("failed to open SSH config file: %w", err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	var currentHost *SSHHost
+
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		
+		// Skip empty lines and comments
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+
+		parts := strings.Fields(line)
+		if len(parts) < 2 {
+			continue
+		}
+
+		key := strings.ToLower(parts[0])
+		value := strings.Join(parts[1:], " ")
+
+		switch key {
+		case "host":
+			// Save previous host if exists
+			if currentHost != nil {
+				sc.Hosts = append(sc.Hosts, *currentHost)
+			}
+			// Start new host
+			currentHost = &SSHHost{
+				Name: value,
+				Port: "22", // default port
+			}
+		case "hostname":
+			if currentHost != nil {
+				currentHost.Hostname = value
+			}
+		case "user":
+			if currentHost != nil {
+				currentHost.User = value
+			}
+		case "port":
+			if currentHost != nil {
+				currentHost.Port = value
+			}
+		case "identityfile":
+			if currentHost != nil {
+				currentHost.Identity = value
+			}
+		}
+	}
+
+	// Add the last host
+	if currentHost != nil {
+		sc.Hosts = append(sc.Hosts, *currentHost)
+	}
+
+	if err := scanner.Err(); err != nil {
+		return fmt.Errorf("error reading SSH config file: %w", err)
+	}
+
+	return nil
+}
+
+// GetHosts returns all configured SSH hosts
+func (sc *SSHConfig) GetHosts() []SSHHost {
+	return sc.Hosts
+}
+
+// GetHostByName returns a specific host by name
+func (sc *SSHConfig) GetHostByName(name string) (*SSHHost, error) {
+	for _, host := range sc.Hosts {
+		if host.Name == name {
+			return &host, nil
+		}
+	}
+	return nil, fmt.Errorf("host '%s' not found", name)
+}