support for preferred combo box choice added

xrdp/xrdp_login_wnd.c

@@ -242,6 +242,74 @@ xrdp_wm_ok_clicked(struct xrdp_bitmap *wnd)
     return 0;
 }
 
+/**
+* This is an internal function in this file used to parse the domain information
+* sent from the client.
+* If the information starts with '_' the domain field contains the
+* IP/DNS to connect to. If the domain field contains an additional '__' the char
+* that follows this '__' is an index number of a preferred combo choice.
+* Valid values for this choice is 0-9. But this function will only return index 
+* numbers between 0 and the max number of combo items -1.
+* Example: _192.168.1.2__1 result in a resultbuffer containing 192.168.1.2 and 
+* the return value will be 1. Meaning that index 1 is the preferred combo choice.
+* 
+* Users can create shortcuts where this information is configured. These 
+* shortcuts simplifies login.
+* @param orginalDomainInfo indata to this function
+* @param comboMax the max number of combo choices
+* @param decode if true then we perform decoding of combo choice
+* @param resultBuffer must be pre allocated before calling this function.
+* Holds the IP. The size of this buffer must be 256 bytes
+* @return the index number of the combobox that the user prefer.
+* 0 if the user does not prefer any choice.
+*/
+static int APP_CC xrdp_wm_parse_domain_information(char *orginalDomainInfo, int comboMax, int decode, char *resultBuffer)
+{
+    /* If the first char in the domain name is '_' we use the domain name as IP*/
+    int ret = 0; // default return value
+    g_memset(resultBuffer, 0, 255);  
+    if(orginalDomainInfo[0]=='_')
+    {
+         /* we try to locate a number indicating what combobox index the user prefer
+         * the information is loaded from domain field, from the client
+         * log_message(LOG_LEVEL_DEBUG, "domain contains _");	
+         * We must use valid chars in the domain name. 
+         * Underscore is a valid name in the domain.
+         * Invalid chars are ignored in microsoft client therefore we use '_' again.
+         * this sec '__' contains the split for index.*/
+         int pos = g_pos(&orginalDomainInfo[1],"__");
+         if(pos>0)
+         {
+             /* an index is found we try to use it
+             log_message(LOG_LEVEL_DEBUG, "domain contains index char __");*/
+             if(decode)
+             {
+                 char index[2] ;
+                 char debugstr[256] ;
+                 g_memset(index, 0, 2) ;
+                 int comboxindex ;
+                 g_strncpy(index, &orginalDomainInfo[pos+3], 1); // we just accept values 0-9  (one figure)
+                 comboxindex = g_htoi(index) ;
+                 g_sprintf(debugstr, "Value of index (as char): %s (converted) : %d (max) : %d",index,comboxindex,comboMax-1);
+                 log_message(LOG_LEVEL_DEBUG, debugstr);
+                 if(comboxindex>0 && comboxindex<comboMax) // limit to max number of items in combo box
+                 {
+                    log_message(LOG_LEVEL_DEBUG, "domain contains a valid index number");
+                    ret = comboxindex ; // preferred index for combo box.
+                 }
+             }
+             // pos limit the String to only contain the IP
+             g_strncpy(resultBuffer, &orginalDomainInfo[1], pos); 
+         }
+         else
+         {
+             //log_message(LOG_LEVEL_DEBUG, "domain does not contain _");
+             g_strncpy(resultBuffer, &orginalDomainInfo[1], 255);		
+         }
+    }
+    return ret ;
+}
+
 /******************************************************************************/
 static int APP_CC
 xrdp_wm_show_edits(struct xrdp_wm *self, struct xrdp_bitmap *combo)
@@ -269,7 +337,7 @@ xrdp_wm_show_edits(struct xrdp_wm *self, struct xrdp_bitmap *combo)
     }
 
     insert_index = list_index_of(self->login_window->child_list,
-                                 (long)combo);
+                                 (long)combo); // find combo in the list
     insert_index++;
     mod = (struct xrdp_mod_data *)
           list_get_item(combo->data_list, combo->item_index);
@@ -330,7 +398,9 @@ xrdp_wm_show_edits(struct xrdp_wm *self, struct xrdp_bitmap *combo)
                     /* If the first char in the domain name is '_' we use the domain name as IP*/
                     if(self->session->client_info->domain[0]=='_')
                     {
-                        g_strncpy(b->caption1, &self->session->client_info->domain[1], 255);
+                        char resultIP[256];
+                        xrdp_wm_parse_domain_information(self->session->client_info->domain,combo->data_list->count,0,resultIP);
+                        g_strncpy(b->caption1, resultIP, 255);
                         b->edit_pos = g_mbstowcs(0, b->caption1, 0);
                     }
 
@@ -642,7 +712,12 @@ xrdp_login_wnd_create(struct xrdp_wm *self)
     but->tab_stop = 1;
     self->login_window->esc_button = but;
 
-    /* labels and edits */
+    /* labels and edits.
+    * parameter: 1 = decode domain field index information from client.
+    * We only perform this the first time for each connection.
+    */
+    char resultIP[256]; // just a dummy place holder, we ignore
+    combo->item_index = xrdp_wm_parse_domain_information(self->session->client_info->domain,combo->data_list->count,1,resultIP);   
     xrdp_wm_show_edits(self, combo);
 
     return 0;