Qt: Don't check capture filter for user DLTs

This makes it possible to use a capture filter on an interface
with user DLTs (147-162).

Bug: 11656
Ping-Bug: 11668
Change-Id: Ie9931b27e8dc8ea239e7e04e26d0ae1cacba50c9
Reviewed-on: https://code.wireshark.org/review/12996
Petri-Dish: Stig Bjørlykke <stig@bjorlykke.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Stig Bjørlykke <stig@bjorlykke.org>

1 files changed, 14 insertions, 7 deletions

diff --git a/ui/qt/capture_filter_syntax_worker.cpp b/ui/qt/capture_filter_syntax_worker.cpp
index f19d6f0b2a..e38e0e05c9 100644
--- a/ui/qt/capture_filter_syntax_worker.cpp
+++ b/ui/qt/capture_filter_syntax_worker.cpp
@@ -29,6 +29,7 @@
 #endif
 
 #include "capture_filter_syntax_worker.h"
+#include "syntax_line_edit.h"
 
 #include <QMutexLocker>
 #include <QSet>
@@ -58,7 +59,7 @@ void CaptureFilterSyntaxWorker::start() {
         struct bpf_program fcode;
         pcap_t *pd;
         int pc_err;
-        bool ok = true;
+        enum SyntaxLineEdit::SyntaxState state = SyntaxLineEdit::Valid;
         QString err_str;
 
         data_mtx_.lock();
@@ -72,7 +73,7 @@ void CaptureFilterSyntaxWorker::start() {
         data_mtx_.unlock();
 
         if (global_capture_opts.num_selected < 1) {
-            emit syntaxResult(filter, false, QString("No interfaces selected"));
+            emit syntaxResult(filter, SyntaxLineEdit::Invalid, QString("No interfaces selected"));
             DEBUG_SYNTAX_CHECK("unknown", "no interfaces");
             continue;
         }
@@ -82,7 +83,13 @@ void CaptureFilterSyntaxWorker::start() {
 
             device = g_array_index(global_capture_opts.all_ifaces, interface_t, if_idx);
             if (!device.locked && device.selected) {
-                active_dlts.insert(device.active_dlt);
+                if (device.active_dlt >= DLT_USER0 && device.active_dlt <= DLT_USER15) {
+                    // Capture filter for DLT_USER is unknown
+                    state = SyntaxLineEdit::Deprecated;
+                    err_str = "Unable to check capture filter";
+                } else {
+                    active_dlts.insert(device.active_dlt);
+                }
             }
         }
 
@@ -97,7 +104,7 @@ void CaptureFilterSyntaxWorker::start() {
 
             if (pc_err) {
                 DEBUG_SYNTAX_CHECK("unknown", "known bad");
-                ok = false;
+                state = SyntaxLineEdit::Invalid;
                 err_str = pcap_geterr(pd);
             } else {
                 DEBUG_SYNTAX_CHECK("unknown", "known good");
@@ -106,9 +113,9 @@ void CaptureFilterSyntaxWorker::start() {
 
             pcap_compile_mtx_.unlock();
 
-            if (!ok) break;
+            if (state == SyntaxLineEdit::Invalid) break;
         }
-        emit syntaxResult(filter, ok, err_str);
+        emit syntaxResult(filter, state, err_str);
 
         DEBUG_SYNTAX_CHECK("known", "idle");
     }
@@ -124,7 +131,7 @@ void CaptureFilterSyntaxWorker::checkFilter(const QString &filter)
     DEBUG_SYNTAX_CHECK("received", "?");
     data_cond_.wakeOne();
 #else
-    emit syntaxResult(filter, true, QString("Syntax checking unavailable"));
+    emit syntaxResult(filter, SyntaxLineEdit::Deprecated, QString("Syntax checking unavailable"));
 #endif // HAVE_LIBPCAP
 }