feat: start new cmd with custom args in ?cmd=

cmd/gterm/main.go

@@ -37,6 +37,7 @@ var (
 	flagVer      bool
 	flagArgs     arrayFlags
 	flagProfile  bool
+	flagSalt     string
 )
 
 func init() {
@@ -49,6 +50,7 @@ func init() {
 	flag.IntVar(&flagLogLevel, "log-level", 9, "log level, error:1 debug:2 warn:4 info:8")
 	flag.StringVar(&flagAllowIP, "allow", "", "restrict ip")
 	flag.BoolVar(&flagProfile, "profile", false, "print default profile, could be invoked with <(..)")
+	flag.StringVar(&flagSalt, "salt", "", "add salt to encoded keyparam")
 	flag.BoolVar(&flagVer, "v", false, "show version")
 
 	flag.Usage = func() {
@@ -76,6 +78,7 @@ func main() {
 	g.Cmd = flagShell
 	g.Args = flagArgs
 	g.Dir = flagDir
+	g.Salt = flagSalt
 
 	server := &http.Server{
 		Addr:    flagAddr,

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/gorilla/websocket v1.4.2
 	kumoly.io/lib/klog v0.0.8
 	kumoly.io/lib/ksrv v0.0.2-0.20211112060911-0d61b343a298
+	kumoly.io/lib/xorencrypt v0.1.0
 )
 
 require (

go.sum

@@ -11,3 +11,5 @@ kumoly.io/lib/klog v0.0.8 h1:6hTfDlZh7KGnPrd2tUrauCKRImSnyyN9DHXpey3Czn8=
 kumoly.io/lib/klog v0.0.8/go.mod h1:Snm+c1xRrh/RbXsxQf7UGYbAJGPcIa6bEEN+CmzJh7M=
 kumoly.io/lib/ksrv v0.0.2-0.20211112060911-0d61b343a298 h1:0raqoIXmNpD6s1SrJbieAyIIkDyhe+aqfaXvx8wenrI=
 kumoly.io/lib/ksrv v0.0.2-0.20211112060911-0d61b343a298/go.mod h1:pwd+NspxnoxPJAETRY2V4i2qZc+orKLxvWzGUBiqBW8=
+kumoly.io/lib/xorencrypt v0.1.0 h1:VssGocaBAPyLn+QURVY8FdFYRBmwFr26z7ame0zwV44=
+kumoly.io/lib/xorencrypt v0.1.0/go.mod h1:+L3JtdD/CTlcXvE8X7AvOJBVbN16qvnxxv3zIWPZgQM=

gterm.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"strings"
 	"time"
 
@@ -16,6 +17,7 @@ import (
 	"kumoly.io/lib/klog"
 	"kumoly.io/lib/ksrv"
 	"kumoly.io/lib/ksrv/engine"
+	"kumoly.io/lib/xorencrypt"
 	"kumoly.io/tools/gterm/public"
 )
 
@@ -53,6 +55,7 @@ type GTerm struct {
 	// cycle should be tolerated, beyond this the connection should be deemed dead
 	Timeout    time.Duration
 	BufferSize int
+	Salt       string
 }
 
 func New() *GTerm {
@@ -125,6 +128,22 @@ func (g *GTerm) App(w http.ResponseWriter, r *http.Request) {
 	servePublic.ServeHTTP(w, r)
 }
 
+type NewCmdRequest struct {
+	Cmd  string   `json:"cmd"`
+	Envs []string `json:"envs"`
+	Args []string `json:"args"`
+	Dir  string   `json:"dir"`
+}
+
+func (g *GTerm) defaultCmd() *exec.Cmd {
+	cmd := exec.Command(g.Cmd, g.Args...)
+	cmd.Env = g.Envs
+	if g.Dir != "" && g.Dir != "." {
+		cmd.Dir = g.Dir
+	}
+	return cmd
+}
+
 func (g *GTerm) WS(w http.ResponseWriter, r *http.Request) {
 	id := fmt.Sprintf("[%02d] %s", ctr(), ksrv.GetIP(r))
 	pool[id] = make(chan struct{}, 1)
@@ -133,7 +152,26 @@ func (g *GTerm) WS(w http.ResponseWriter, r *http.Request) {
 		delete(pool, id)
 	}()
 	l := klog.Sub(id)
-	l.Info("connection established.")
+
+	var cmd *exec.Cmd
+	base := filepath.Base(r.URL.Path)
+	if base != "ws" && base != "." && base != "/" {
+		base = strings.Trim(base, "/")
+		param, _ := xorencrypt.Decrypt(base, g.Salt)
+		l.Info("starting cmd => ", l.M(param, klog.FgHiGreen))
+		req := &NewCmdRequest{}
+		err := json.Unmarshal([]byte(param), req)
+		if err != nil {
+			cmd = g.defaultCmd()
+		} else {
+			cmd = exec.Command(req.Cmd, req.Args...)
+			cmd.Env = req.Envs
+			cmd.Dir = req.Dir
+		}
+	} else {
+		cmd = g.defaultCmd()
+	}
+
 	upgrader := websocket.Upgrader{
 		HandshakeTimeout: 0,
 		ReadBufferSize:   g.BufferSize,
@@ -144,12 +182,8 @@ func (g *GTerm) WS(w http.ResponseWriter, r *http.Request) {
 		l.Error(err)
 		return
 	}
+	l.Info("connection established.")
 
-	cmd := exec.Command(g.Cmd, g.Args...)
-	cmd.Env = g.Envs
-	if g.Dir != "" && g.Dir != "." {
-		cmd.Dir = g.Dir
-	}
 	tty, err := pty.Start(cmd)
 	if err != nil {
 		l.Error(err)

main.js

@@ -17,8 +17,13 @@ import 'xterm/css/xterm.css'
     });
     const fitAddon = new FitAddon();
     terminal.loadAddon(fitAddon);
+    const params = new URLSearchParams(window.location.search);
+    let newcmd = '';
+    if (params.has('cmd')){
+      newcmd = "/"+params.get('cmd')
+    }
     var protocol = (location.protocol === "https:") ? "wss://" : "ws://";
-    var url = protocol + location.host + location.pathname + "ws"
+    var url = protocol + location.host + location.pathname + "ws" + newcmd
     const ws = new WebSocket(url);
     const attachAddon = new AttachAddon(ws);
     const webLinksAddon = new WebLinksAddon();

public/index.html

@@ -1 +1 @@
-<!DOCTYPE html><html><head><link rel="stylesheet" href="index.6999253a.css"><title>{{.AppName}}</title><style>body::-webkit-scrollbar,div::-webkit-scrollbar,html::-webkit-scrollbar{display:none;width:0}body,html{margin:0;overflow:hidden;padding:0}div#terminal{height:100%;left:0;position:absolute;top:0;width:100%}div#terminal div{height:100%}.xterm-screen,.xterm-viewport{height:100%;margin:0;padding:0}</style></head><body> <div id="terminal"></div> <script type="module" src="index.52560dc1.js"></script> </body></html>
+<!DOCTYPE html><html><head><link rel="stylesheet" href="index.6999253a.css"><title>{{.AppName}}</title><style>body::-webkit-scrollbar,div::-webkit-scrollbar,html::-webkit-scrollbar{display:none;width:0}body,html{margin:0;overflow:hidden;padding:0}div#terminal{height:100%;left:0;position:absolute;top:0;width:100%}div#terminal div{height:100%}.xterm-screen,.xterm-viewport{height:100%;margin:0;padding:0}</style></head><body> <div id="terminal"></div> <script type="module" src="index.2719cc8f.js"></script> </body></html>