/* 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 (const oid *name, size_t namelen,
	   const oid *iname, size_t inamelen,
	   const struct trap_object *trapobj, size_t trapobjlen,
	   unsigned int tick, u_char sptrap)
{
  return 1;
}

#endif /* HAVE_SNMP */