Validate short and long names so whitespace or empty names cannot be used (#6993)

* Say issue #6867 about adding validation for long_name and short_name. Firmware should expect at least 1 non-whitespace character for both long_name and short_name. added the USERPREFS_CONFIG_DEVICE_ROLE example to userPrefs.jsonc

* Validation for user long_name and short_name implemented. No longer can use whitespace characters. Return BAD_REQUEST error responses when validation fails and warning logs when validation rejects invalid names.

* Improve whitespace validation for user names with ctype.h, ensure logging works

* Add whitespace validation to ham mode to prevent validation bypass and to match python cli command

* punctuation change

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

Author: Crank-Git

src/modules/AdminModule.cpp

@@ -7,6 +7,7 @@
 #include "SPILock.h"
 #include "meshUtils.h"
 #include <FSCommon.h>
+#include <ctype.h> // for better whitespace handling
 #if defined(ARCH_ESP32) && !MESHTASTIC_EXCLUDE_BLUETOOTH
 #include "BleOta.h"
 #endif
@@ -155,6 +156,28 @@ bool AdminModule::handleReceivedProtobuf(const meshtastic_MeshPacket &mp, meshta
      */
     case meshtastic_AdminMessage_set_owner_tag:
         LOG_DEBUG("Client set owner");
+        // Validate names
+        if (*r->set_owner.long_name) {
+            const char *start = r->set_owner.long_name;
+            // Skip all whitespace (space, tab, newline, etc)
+            while (*start && isspace((unsigned char)*start))
+                start++;
+            if (*start == '\0') {
+                LOG_WARN("Rejected long_name: must contain at least 1 non-whitespace character");
+                myReply = allocErrorResponse(meshtastic_Routing_Error_BAD_REQUEST, &mp);
+                break;
+            }
+        }
+        if (*r->set_owner.short_name) {
+            const char *start = r->set_owner.short_name;
+            while (*start && isspace((unsigned char)*start))
+                start++;
+            if (*start == '\0') {
+                LOG_WARN("Rejected short_name: must contain at least 1 non-whitespace character");
+                myReply = allocErrorResponse(meshtastic_Routing_Error_BAD_REQUEST, &mp);
+                break;
+            }
+        }
         handleSetOwner(r->set_owner);
         break;
 
@@ -1153,6 +1176,27 @@ void AdminModule::handleStoreDeviceUIConfig(const meshtastic_DeviceUIConfig &uic
 
 void AdminModule::handleSetHamMode(const meshtastic_HamParameters &p)
 {
+    // Validate ham parameters before setting since this would bypass validation in the owner struct
+    if (*p.call_sign) {
+        const char *start = p.call_sign;
+        // Skip all whitespace
+        while (*start && isspace((unsigned char)*start))
+            start++;
+        if (*start == '\0') {
+            LOG_WARN("Rejected ham call_sign: must contain at least 1 non-whitespace character");
+            return;
+        }
+    }
+    if (*p.short_name) {
+        const char *start = p.short_name;
+        while (*start && isspace((unsigned char)*start))
+            start++;
+        if (*start == '\0') {
+            LOG_WARN("Rejected ham short_name: must contain at least 1 non-whitespace character");
+            return;
+        }
+    }
+
     // Set call sign and override lora limitations for licensed use
     strncpy(owner.long_name, p.call_sign, sizeof(owner.long_name));
     strncpy(owner.short_name, p.short_name, sizeof(owner.short_name));

userPrefs.jsonc

@@ -21,6 +21,7 @@
   // "USERPREFS_CONFIG_LORA_REGION": "meshtastic_Config_LoRaConfig_RegionCode_US",
   // "USERPREFS_CONFIG_OWNER_LONG_NAME": "My Long Name",
   // "USERPREFS_CONFIG_OWNER_SHORT_NAME": "MLN",
+  // "USERPREFS_CONFIG_DEVICE_ROLE": "meshtastic_Config_DeviceConfig_Role_CLIENT", // Defaults to CLIENT. ROUTER*, LOST AND FOUND, and REPEATER roles are restricted.
   // "USERPREFS_EVENT_MODE": "1",
   // "USERPREFS_FIXED_BLUETOOTH": "121212",
   // "USERPREFS_FIXED_GPS": "",