rust/snmp: Support get-info-by-id

rust/src/snmp/snmp.rs

@@ -39,6 +39,16 @@ pub enum SNMPEvent {
     UnknownSecurityModel,
 }
 
+impl SNMPEvent {
+    fn from_i32(value: i32) -> Option<SNMPEvent> {
+        match value {
+            0 => Some(SNMPEvent::MalformedData),
+            1 => Some(SNMPEvent::UnknownSecurityModel),
+            _ => None,
+        }
+    }
+}
+
 pub struct SNMPState {
     /// SNMP protocol version
     pub version: u32,
@@ -438,6 +448,27 @@ pub extern "C" fn rs_snmp_state_get_events(tx: *mut std::os::raw::c_void)
     return tx.events;
 }
 
+#[no_mangle]
+pub extern "C" fn rs_snmp_state_get_event_info_by_id(event_id: std::os::raw::c_int,
+                                                     event_name: *mut *const std::os::raw::c_char,
+                                                     event_type: *mut core::AppLayerEventType)
+                                                     -> i8
+{
+    if let Some(e) = SNMPEvent::from_i32(event_id as i32) {
+        let estr = match e {
+            SNMPEvent::MalformedData         => { "malformed_data\0" },
+            SNMPEvent::UnknownSecurityModel  => { "unknown_security_model\0" },
+        };
+        unsafe{
+            *event_name = estr.as_ptr() as *const std::os::raw::c_char;
+            *event_type = core::APP_LAYER_EVENT_TYPE_TRANSACTION;
+        };
+        0
+    } else {
+        -1
+    }
+}
+
 #[no_mangle]
 pub extern "C" fn rs_snmp_state_get_event_info(event_name: *const std::os::raw::c_char,
                                               event_id: *mut std::os::raw::c_int,
@@ -579,6 +610,7 @@ pub unsafe extern "C" fn rs_register_snmp_parser() {
         set_de_state       : rs_snmp_state_set_tx_detect_state,
         get_events         : Some(rs_snmp_state_get_events),
         get_eventinfo      : Some(rs_snmp_state_get_event_info),
+        get_eventinfo_byid : Some(rs_snmp_state_get_event_info_by_id),
         localstorage_new   : None,
         localstorage_free  : None,
         get_tx_mpm_id      : None,
@@ -604,6 +636,6 @@ pub unsafe extern "C" fn rs_register_snmp_parser() {
             let _ = AppLayerRegisterParser(&parser, alproto);
         }
     } else {
-        SCLogDebug!("Protocol detecter and parser disabled for SNMP.");
+        SCLogDebug!("Protocol detector and parser disabled for SNMP.");
     }
 }