extcap: Add regular expression validation support

 Regular expressions follow the Qt Regex syntax, which is
 formulated after the Perl Regex syntax. A more detailed
 overview of the possible rules can be found at:
 http://doc.qt.io/qt-4.8/qregexp.html

 If a required option is present, even the double-click on
 the interface will first start the options dialog (Qt only)

 Required fields are marked bold and put first in the dialog.
 Additionally if validation failes (which it will if a required
 field is kept empty, but also if a non-required textfield is
 violating the defined regex), the label of the field is marked
 with red.

Change-Id: If04a1146d0dfa778332ab2a39122c7a6ee1e93d2
Reviewed-on: https://code.wireshark.org/review/12914
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, 17 insertions, 0 deletions

diff --git a/ui/qt/main_welcome.cpp b/ui/qt/main_welcome.cpp
index 521c2aa6a9..667fbf582a 100644
--- a/ui/qt/main_welcome.cpp
+++ b/ui/qt/main_welcome.cpp
@@ -53,6 +53,10 @@
 #define VERSION_FLAVOR ""
 #endif
 
+#if HAVE_EXTCAP
+#include <extcap.h>
+#endif
+
 MainWelcome::MainWelcome(QWidget *parent) :
     QFrame(parent),
     welcome_ui_(new Ui::MainWelcome),
@@ -230,6 +234,19 @@ void MainWelcome::appInitialized()
 void MainWelcome::interfaceDoubleClicked(QTreeWidgetItem *item, int)
 {
     if (item) {
+#if HAVE_EXTCAP
+        QString extcap_string = QVariant(item->data(IFTREE_COL_EXTCAP, Qt::UserRole)).toString();
+        /* We trust the string here. If this interface is really extcap, the string is
+         * being checked immediatly before the dialog is being generated */
+        if ( extcap_string.length() > 0 ) {
+            QString device_name = QVariant(item->data(IFTREE_COL_NAME, Qt::UserRole)).toString();
+            /* this checks if configuration is required and not yet provided or saved via prefs */
+            if ( extcap_has_configuration((const char *)(device_name.toStdString().c_str()), TRUE ) ) {
+                emit showExtcapOptions(device_name);
+                return;
+            }
+        }
+#endif
         emit startCapture();
     }
 }