ipn: debug zero bytes in IPN json messages
package ipn
import (
+ "bytes"
"encoding/binary"
"encoding/json"
"errors"
"tailscale.com/version"
)
+var jsonEscapedZero = []byte(`\u0000`)
+
type NoArgs struct{}
type StartArgs struct {
@@ -85,6 +88,9 @@ func (bs *BackendServer) send(n Notify) {
if err != nil {
log.Fatalf("Failed json.Marshal(notify): %v\n%#v", err, n)
}
+ if bytes.Contains(b, jsonEscapedZero) {
+ log.Printf("[unexpected] zero byte in BackendServer.send notify message: %q", b)
+ }
bs.sendNotifyMsg(b)
}
@@ -204,6 +210,9 @@ func (bc *BackendClient) GotNotifyMsg(b []byte) {
// not interesting
return
}
+ if bytes.Contains(b, jsonEscapedZero) {
+ log.Printf("[unexpected] zero byte in BackendClient.GotNotifyMsg message: %q", b)
+ }
n := Notify{}
if err := json.Unmarshal(b, &n); err != nil {
log.Fatalf("BackendClient.Notify: cannot decode message (length=%d)\n%#v", len(b), string(b))
@@ -230,6 +239,9 @@ func (bc *BackendClient) send(cmd Command) {
if err != nil {
log.Fatalf("Failed json.Marshal(cmd): %v\n%#v\n", err, cmd)
}
+ if bytes.Contains(b, jsonEscapedZero) {
+ log.Printf("[unexpected] zero byte in BackendClient.send command: %q", b)
+ }
bc.sendCommandMsg(b)
}
