Check only root level banner messages for ASA configs (#602)

* Check only root level banner messages for ASA configs

---------

Co-authored-by: Carlos Huaccho <[email protected]>

netutils/config/parser.py

@@ -913,6 +913,7 @@ def banner_end(self) -> str:
 class ASAConfigParser(CiscoConfigParser):
     """Cisco ASA implementation of ConfigParser Class."""
 
+    banner_start: t.List[str] = ["banner"]
     comment_chars: t.List[str] = ["!", ":"]
 
     def __init__(self, config: str):
@@ -925,6 +926,22 @@ def __init__(self, config: str):
         self.same_line_children: t.Set[ConfigLine] = set()
         super(ASAConfigParser, self).__init__(config)
 
+    def is_banner_start(self, line: str) -> bool:
+        """Determine if the line starts a banner config.
+
+        Args:
+            line: The current config line in iteration.
+
+        Returns:
+            True if line starts banner, else False.
+        """
+        for banner_start in self.banner_start:
+            if not line:
+                return False
+            if line.startswith(banner_start):
+                return True
+        return False
+
     def _update_config_lines(self, config_line: str) -> None:
         """Add a ``ConfigLine`` object to ``self.config_lines``.
 

tests/unit/mock/config/parser/base/cisco_asa/asa_nested_banner_received.py

@@ -0,0 +1,13 @@
+from netutils.config.parser import ConfigLine
+
+data = [
+    ConfigLine(config_line="group-policy Grs-POLICY attributes", parents=()),
+    ConfigLine(
+        config_line=" banner value This is an",
+        parents=("group-policy Grs-POLICY attributes",),
+    ),
+    ConfigLine(
+        config_line=" banner value example nested banner",
+        parents=("group-policy Grs-POLICY attributes",),
+    ),
+]

tests/unit/mock/config/parser/base/cisco_asa/asa_nested_banner_sent.txt

@@ -0,0 +1,3 @@
+group-policy Grs-POLICY attributes
+ banner value This is an
+ banner value example nested banner

tests/unit/test_parser.py

@@ -4,6 +4,7 @@
 import os
 
 import pytest
+
 from netutils.config import compliance
 
 MOCK_DIR = os.path.join(os.path.dirname(os.path.realpath(__file__)), "mock", "config", "parser")