added snmp module, Session, get and walk

pandora_server/extras/pandoraPlugintools/snmp.py

@@ -0,0 +1,74 @@
+from easysnmp import Session
+
+####
+# Define global variables dict, used in functions as default values.
+# Its values can be changed.
+#########################################################################################
+
+_GLOBAL_VARIABLES = {
+    'hostname'          : '',
+    'version'           : 3,
+    'community'         : 'public',
+    'user'              : '',
+    'auth_protocol'     : "",
+    'auth_password'     : "",
+    'privacy_protocol'  : "",
+    'privacy_password'  : "",
+    'security_level'    : "authPriv",
+    'timeout'           : 2,
+    'retries'           : 1,
+    'remote_port'       : 161,
+}
+
+def create_snmp_session():
+    host = _GLOBAL_VARIABLES['hostname']
+    version = _GLOBAL_VARIABLES['version']
+    community = _GLOBAL_VARIABLES['community']
+    user = _GLOBAL_VARIABLES['user']
+    auth_protocol = _GLOBAL_VARIABLES['auth_protocol']
+    auth_password = _GLOBAL_VARIABLES['auth_password']
+    privacy_protocol = _GLOBAL_VARIABLES['privacy_protocol']
+    privacy_password = _GLOBAL_VARIABLES['privacy_password']
+    security_level = _GLOBAL_VARIABLES['security_level']
+    timeout = _GLOBAL_VARIABLES['timeout']
+    retries = _GLOBAL_VARIABLES['retries']
+    remote_port = _GLOBAL_VARIABLES['remote_port']
+
+    session_kwargs = {
+        "hostname": host,
+        "version": version,
+        "use_numeric": True,
+        "timeout": timeout,
+        "retries": retries,
+        "remote_port": remote_port
+    }
+
+    if version == 1 or version == 2:
+        session_kwargs["community"] = community
+    elif version == 3:
+        session_kwargs["security_username"] = user
+
+        if security_level == "authPriv":
+            session_kwargs.update({
+                "auth_protocol": auth_protocol,
+                "auth_password": auth_password,
+                "privacy_protocol": privacy_protocol,
+                "privacy_password": privacy_password,
+                "security_level": "auth_with_privacy"
+            })
+        elif security_level == "authNoPriv":
+            session_kwargs.update({
+                "auth_protocol": auth_protocol,
+                "auth_password": auth_password,
+                "security_level": "auth_without_privacy"
+            })
+        elif security_level == "noAuthNoPriv":
+            session_kwargs["security_level"] = "no_auth_or_privacy"
+
+    return Session(**session_kwargs)
+
+def snmp_get(session, oid):
+    return session.get(oid)
+
+def snmp_walk(session, oid):
+    return session.walk(oid)