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, 26 insertions, 0 deletions

diff --git a/extcap_parser.c b/extcap_parser.c
index ef683f1a40..d884298a3a 100644
--- a/extcap_parser.c
+++ b/extcap_parser.c
@@ -300,6 +300,21 @@ extcap_token_sentence *extcap_tokenize_sentence(const gchar *s) {
             return NULL ;
         }
 
+        /* caught a regex quantifier end bracket and not the end of the line.
+         * let's find the correct end bracket */
+        if ( *(e+1) != '{' && strlen ( e ) > 1 ) {
+            gchar *f = (e + 1);
+
+            while ( ( f = g_strstr_len(f, -1, "}") ) != NULL) {
+                if ( strlen ( f ) <= 1 || *(f+1) == '{' )
+                    break;
+                f++;
+            }
+
+            if ( f != NULL )
+                e = f;
+        }
+
         if ((eq = g_strstr_len(b, -1, "=")) == NULL) {
             /* printf("debug - tokenizer - invalid, missing =\n"); */
             extcap_free_tokenized_sentence(rs);
@@ -349,6 +364,8 @@ extcap_token_sentence *extcap_tokenize_sentence(const gchar *s) {
             tv->param_type = EXTCAP_PARAM_PARENT;
         } else if (g_ascii_strcasecmp(tv->arg, "required") == 0) {
             tv->param_type = EXTCAP_PARAM_REQUIRED;
+        } else if (g_ascii_strcasecmp(tv->arg, "validation") == 0) {
+            tv->param_type = EXTCAP_PARAM_VALIDATION;
         } else {
             tv->param_type = EXTCAP_PARAM_UNKNOWN;
         }
@@ -480,6 +497,7 @@ extcap_arg *extcap_new_arg(void) {
     r->default_complex = NULL;
     r->fileexists = FALSE;
     r->fileextension = NULL;
+    r->regexp = NULL;
     r->is_required = FALSE;
 
     r->values = NULL;
@@ -509,6 +527,9 @@ void extcap_free_arg(extcap_arg *a) {
     if (a->fileextension != NULL)
         g_free(a->fileextension);
 
+    if (a->regexp != NULL)
+        g_free(a->regexp);
+
     if (a->range_start != NULL)
         extcap_free_complex(a->range_start);
 
@@ -605,6 +626,11 @@ extcap_arg *extcap_parse_arg_sentence(GList * args, extcap_token_sentence *s) {
             target_arg->fileextension = g_strdup(v->value);
         }
 
+        if ((v = extcap_find_param_by_type(s->param_list, EXTCAP_PARAM_VALIDATION))
+                != NULL) {
+            target_arg->regexp = g_strdup(v->value);
+        }
+
         if ((v = extcap_find_param_by_type(s->param_list, EXTCAP_PARAM_REQUIRED))
                 != NULL) {
             target_arg->is_required = (v->value[0] == 't' || v->value[0] == 'T');