ipn/ipnlocal: add peerapi goroutine fetch

Between owners. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago · 86e85d8934
parent 5835a3f553
commit 86e85d8934
2 changed files with 36 additions and 1 deletions
--- a/ipn/ipnlocal/peerapi.go
+++ b/ipn/ipnlocal/peerapi.go
@ -401,6 +401,10 @@ func (h *peerAPIHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		h.handlePeerPut(w, r)
 		return
 	}
+	if r.URL.Path == "/v0/goroutines" {
+		h.handleServeGoroutines(w, r)
+		return
+	}
 	who := h.peerUser.DisplayName
 	fmt.Fprintf(w, `<html>
 <meta name="viewport" content="width=device-width, initial-scale=1">
@ -582,3 +586,19 @@ func approxSize(n int64) string {
 	}
 	return fmt.Sprintf("~%dMB", n>>20)
 }
+
+func (h *peerAPIHandler) handleServeGoroutines(w http.ResponseWriter, r *http.Request) {
+	if !h.isSelf {
+		http.Error(w, "not owner", http.StatusForbidden)
+		return
+	}
+	var buf []byte
+	for size := 4 << 10; size <= 2<<20; size *= 2 {
+		buf = make([]byte, size)
+		buf = buf[:runtime.Stack(buf, true)]
+		if len(buf) < size {
+			break
+		}
+	}
+	w.Write(buf)
+}
--- a/ipn/ipnlocal/peerapi_test.go
+++ b/ipn/ipnlocal/peerapi_test.go
@ -103,7 +103,7 @@ func hexAll(v string) string {
 	return sb.String()
 }

-func TestHandlePeerPut(t *testing.T) {
+func TestHandlePeerAPI(t *testing.T) {
 	tests := []struct {
 		name       string
 		isSelf     bool // the peer sending the request is owned by us
@ -134,6 +134,21 @@ func TestHandlePeerPut(t *testing.T) {
 				bodyNotContains("You are the owner of this node."),
 			),
 		},
+		{
+			name:   "peer_api_goroutines_deny",
+			isSelf: false,
+			req:    httptest.NewRequest("GET", "/v0/goroutines", nil),
+			checks: checks(httpStatus(403)),
+		},
+		{
+			name:   "peer_api_goroutines",
+			isSelf: true,
+			req:    httptest.NewRequest("GET", "/v0/goroutines", nil),
+			checks: checks(
+				httpStatus(200),
+				bodyContains("ServeHTTP"),
+			),
+		},
 		{
 			name:       "reject_non_owner_put",
 			isSelf:     false,