added network debugger support tools

core/cmd/dbgd/dbgd.service

@@ -0,0 +1,4 @@
+kind: service
+exec-start: /core/dbgd -debug
+user: system
+restart: true

core/cmd/dbgd/main.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+var (
+	port  string
+	debug bool
+)
+
+func init() {
+	flag.StringVar(&port, "port", "5555", "port to connect to")
+	flag.BoolVar(&debug, "debug", false, "enable debug logging")
+}
+
+func main() {
+	flag.Parse()
+
+	if !debug {
+		log.SetOutput(io.Discard)
+	}
+
+	listener, err := net.Listen("tcp", ":"+port)
+	if err != nil {
+		_, _ = fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	defer listener.Close()
+
+	log.Printf("Listening on port %s", port)
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			_, _ = fmt.Fprintln(os.Stderr, err)
+			continue
+		}
+		handleConn(conn)
+	}
+}
+
+func handleConn(conn net.Conn) {
+	defer conn.Close()
+
+	reader := bufio.NewReader(conn)
+	input, err := reader.ReadString('\n')
+	if err != nil {
+		_, _ = fmt.Fprintln(os.Stderr, err)
+		return
+	}
+	args := strings.Split(strings.TrimSpace(input), " ")
+	if len(args) < 1 {
+		_, _ = fmt.Fprintf(conn, "Usage: dbg <command>\n")
+		return
+	}
+	switch args[0] {
+	case "exec":
+		if len(args) == 1 {
+			_, _ = fmt.Fprintf(conn, "Usage: dbg exec <command> <args...>\n")
+		}
+		output, err := exec.Command(args[1], args[2:]...).CombinedOutput()
+		if err != nil {
+			_, _ = fmt.Fprintf(os.Stderr, "%s: %s\n", string(output), err)
+			return
+		}
+		_, err = fmt.Fprint(conn, string(output))
+		if err != nil {
+			log.Println("ERROR: failed to write output to exec:", err)
+		}
+	case "shell":
+		cmd := exec.Command("/core/shell")
+		cmd.Stdin = conn
+		cmd.Stdout = conn
+		cmd.Stderr = conn
+		if err := cmd.Run(); err != nil {
+			_, _ = fmt.Fprintln(os.Stderr, err)
+		}
+	default:
+		_, _ = fmt.Fprintf(conn, "Usage: dbg <command>\n")
+	}
+}

graphics/go.mod

@@ -0,0 +1,3 @@
+module rlxos/graphics
+
+go 1.22

tools/dbg/go.mod

@@ -0,0 +1,3 @@
+module rlxos/tools/dbg
+
+go 1.22

tools/dbg/main.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"strings"
+)
+
+var (
+	addr  string
+	debug bool
+)
+
+func init() {
+	flag.StringVar(&addr, "addr", "", "the address to connect to")
+	flag.BoolVar(&debug, "debug", false, "debug mode")
+}
+
+func main() {
+	flag.Parse()
+	if !debug {
+		log.SetOutput(io.Discard)
+	}
+
+	conn, err := net.Dial("tcp", addr)
+	if err != nil {
+		_, _ = fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	defer conn.Close()
+
+	args := flag.Args()
+
+	if len(args) == 0 {
+		return
+	}
+
+	switch args[0] {
+	case "shell":
+		go func() {
+			_, _ = io.Copy(os.Stdout, conn)
+			_, _ = io.Copy(os.Stderr, conn)
+		}()
+		log.Println("Starting shell")
+		if _, err := conn.Write([]byte(args[0] + "\n")); err != nil {
+			_, _ = fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
+		}
+
+		_, err := io.Copy(conn, os.Stdin)
+		if err != nil {
+			_, _ = fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
+		}
+	default:
+		cmd := strings.Join(flag.Args(), " ")
+		log.Printf("Sending '%s' to %s\n", cmd, conn.RemoteAddr())
+		if _, err := conn.Write([]byte(cmd + "\n")); err != nil {
+			_, _ = fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
+		}
+
+		reader := bufio.NewReader(conn)
+		for {
+			out, err := reader.ReadString('\n')
+			if err != nil {
+				if err != io.EOF {
+					_, _ = fmt.Fprintln(os.Stderr, err)
+					os.Exit(1)
+				}
+				break
+			}
+			fmt.Print(out)
+		}
+	}
+
+}