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-rw-r--r--lib/agentx.c213
1 files changed, 213 insertions, 0 deletions
diff --git a/lib/agentx.c b/lib/agentx.c
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--- /dev/null
+++ b/lib/agentx.c
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+/* SNMP support
+ * Copyright (C) 2012 Vincent Bernat <bernat@luffy.cx>
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING. If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include <zebra.h>
+
+#if defined HAVE_SNMP && defined SNMP_AGENTX
+#include <net-snmp/net-snmp-config.h>
+#include <net-snmp/net-snmp-includes.h>
+
+#include "command.h"
+#include "smux.h"
+
+int agentx_enabled = 0;
+
+/* AgentX node. */
+static struct cmd_node agentx_node =
+{
+ SMUX_NODE,
+ "" /* AgentX has no interface. */
+};
+
+/* Logging NetSNMP messages */
+static int
+agentx_log_callback(int major, int minor,
+ void *serverarg, void *clientarg)
+{
+ struct snmp_log_message *slm = (struct snmp_log_message *)serverarg;
+ char *msg = strdup (slm->msg);
+ if (msg) msg[strlen(msg)-1] = '\0';
+ switch (slm->priority)
+ {
+ case LOG_EMERG: zlog_err ("snmp[emerg]: %s", msg?msg:slm->msg); break;
+ case LOG_ALERT: zlog_err ("snmp[alert]: %s", msg?msg:slm->msg); break;
+ case LOG_CRIT: zlog_err ("snmp[crit]: %s", msg?msg:slm->msg); break;
+ case LOG_ERR: zlog_err ("snmp[err]: %s", msg?msg:slm->msg); break;
+ case LOG_WARNING: zlog_warn ("snmp[warning]: %s", msg?msg:slm->msg); break;
+ case LOG_NOTICE: zlog_notice("snmp[notice]: %s", msg?msg:slm->msg); break;
+ case LOG_INFO: zlog_info ("snmp[info]: %s", msg?msg:slm->msg); break;
+ case LOG_DEBUG: zlog_debug ("snmp[debug]: %s", msg?msg:slm->msg); break;
+ }
+ free(msg);
+ return SNMP_ERR_NOERROR;
+}
+
+static int
+config_write_agentx (struct vty *vty)
+{
+ if (agentx_enabled)
+ vty_out (vty, "agentx%s", VTY_NEWLINE);
+ return 0;
+}
+
+DEFUN (agentx_enable,
+ agentx_enable_cmd,
+ "agentx",
+ "SNMP AgentX protocol settings\n"
+ "SNMP AgentX settings\n")
+{
+ if (!agentx_enabled)
+ {
+ init_snmp("quagga");
+ agentx_enabled = 1;
+ return CMD_SUCCESS;
+ }
+ vty_out (vty, "SNMP AgentX already enabled%s", VTY_NEWLINE);
+ return CMD_WARNING;
+}
+
+DEFUN (no_agentx,
+ no_agentx_cmd,
+ "no agentx",
+ NO_STR
+ "SNMP AgentX protocol settings\n"
+ "SNMP AgentX settings\n")
+{
+ if (!agentx_enabled) return CMD_SUCCESS;
+ vty_out (vty, "SNMP AgentX support cannot be disabled once enabled%s", VTY_NEWLINE);
+ return CMD_WARNING;
+}
+
+void
+smux_init (struct thread_master *tm)
+{
+ netsnmp_enable_subagent ();
+ snmp_disable_log ();
+ snmp_enable_calllog ();
+ snmp_register_callback (SNMP_CALLBACK_LIBRARY,
+ SNMP_CALLBACK_LOGGING,
+ agentx_log_callback,
+ NULL);
+ init_agent ("quagga");
+
+ install_node (&agentx_node, config_write_agentx);
+ install_element (CONFIG_NODE, &agentx_enable_cmd);
+ install_element (CONFIG_NODE, &no_agentx_cmd);
+}
+
+void
+smux_register_mib (const char *descr, struct variable *var,
+ size_t width, int num,
+ oid name[], size_t namelen)
+{
+ register_mib (descr, var, width, num, name, namelen);
+}
+
+int
+smux_trap (struct variable *vp, size_t vp_len,
+ const oid *ename, size_t enamelen,
+ const oid *name, size_t namelen,
+ const oid *iname, size_t inamelen,
+ const struct trap_object *trapobj, size_t trapobjlen,
+ u_char sptrap)
+{
+ oid objid_snmptrap[] = { 1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0 };
+ size_t objid_snmptrap_len = sizeof objid_snmptrap / sizeof (oid);
+ oid notification_oid[MAX_OID_LEN];
+ size_t notification_oid_len;
+ unsigned int i;
+
+ netsnmp_variable_list *notification_vars = NULL;
+ if (!agentx_enabled) return 0;
+
+ /* snmpTrapOID */
+ oid_copy (notification_oid, ename, enamelen);
+ notification_oid[enamelen] = sptrap;
+ notification_oid_len = enamelen + 1;
+ snmp_varlist_add_variable (&notification_vars,
+ objid_snmptrap, objid_snmptrap_len,
+ ASN_OBJECT_ID,
+ (u_char *) notification_oid,
+ notification_oid_len * sizeof(oid));
+
+ /* Provided bindings */
+ for (i = 0; i < trapobjlen; i++)
+ {
+ unsigned int j;
+ oid oid[MAX_OID_LEN];
+ size_t oid_len, onamelen;
+ u_char *val;
+ size_t val_len;
+ WriteMethod *wm = NULL;
+ struct variable cvp;
+
+ /* Make OID. */
+ if (trapobj[i].namelen > 0)
+ {
+ /* Columnar object */
+ onamelen = trapobj[i].namelen;
+ oid_copy (oid, name, namelen);
+ oid_copy (oid + namelen, trapobj[i].name, onamelen);
+ oid_copy (oid + namelen + onamelen, iname, inamelen);
+ oid_len = namelen + onamelen + inamelen;
+ }
+ else
+ {
+ /* Scalar object */
+ onamelen = trapobj[i].namelen * (-1);
+ oid_copy (oid, name, namelen);
+ oid_copy (oid + namelen, trapobj[i].name, onamelen);
+ oid[onamelen + namelen] = 0;
+ oid_len = namelen + onamelen + 1;
+ }
+
+ /* Locate the appropriate function and type in the MIB registry. */
+ for (j = 0; j < vp_len; j++)
+ {
+ if (oid_compare (trapobj[i].name, onamelen, vp[j].name, vp[j].namelen) != 0)
+ continue;
+ /* We found the appropriate variable in the MIB registry. */
+ oid_copy(cvp.name, name, namelen);
+ oid_copy(cvp.name + namelen, vp[j].name, vp[j].namelen);
+ cvp.namelen = namelen + vp[j].namelen;
+ cvp.type = vp[j].type;
+ cvp.magic = vp[j].magic;
+ cvp.acl = vp[j].acl;
+ cvp.findVar = vp[j].findVar;
+ /* Grab the result. */
+ val = cvp.findVar (&cvp, oid, &oid_len, 1, &val_len, &wm);
+ if (!val) break;
+ snmp_varlist_add_variable (&notification_vars,
+ oid, oid_len,
+ vp[j].type,
+ val,
+ val_len);
+ break;
+ }
+ }
+
+
+ send_v2trap (notification_vars);
+ snmp_free_varbind (notification_vars);
+ return 1;
+}
+
+#endif /* HAVE_SNMP */
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