Annotation of embedaddon/quagga/lib/agentx.c, revision 1.1
1.1 ! misho 1: /* SNMP support
! 2: * Copyright (C) 2012 Vincent Bernat <bernat@luffy.cx>
! 3: *
! 4: * This file is part of GNU Zebra.
! 5: *
! 6: * GNU Zebra is free software; you can redistribute it and/or modify it
! 7: * under the terms of the GNU General Public License as published by the
! 8: * Free Software Foundation; either version 2, or (at your option) any
! 9: * later version.
! 10: *
! 11: * GNU Zebra is distributed in the hope that it will be useful, but
! 12: * WITHOUT ANY WARRANTY; without even the implied warranty of
! 13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
! 14: * General Public License for more details.
! 15: *
! 16: * You should have received a copy of the GNU General Public License
! 17: * along with GNU Zebra; see the file COPYING. If not, write to the Free
! 18: * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
! 19: * 02111-1307, USA.
! 20: */
! 21:
! 22: #include <zebra.h>
! 23:
! 24: #if defined HAVE_SNMP && defined SNMP_AGENTX
! 25: #include <net-snmp/net-snmp-config.h>
! 26: #include <net-snmp/net-snmp-includes.h>
! 27:
! 28: #include "command.h"
! 29: #include "smux.h"
! 30:
! 31: int agentx_enabled = 0;
! 32:
! 33: /* AgentX node. */
! 34: static struct cmd_node agentx_node =
! 35: {
! 36: SMUX_NODE,
! 37: "" /* AgentX has no interface. */
! 38: };
! 39:
! 40: /* Logging NetSNMP messages */
! 41: static int
! 42: agentx_log_callback(int major, int minor,
! 43: void *serverarg, void *clientarg)
! 44: {
! 45: struct snmp_log_message *slm = (struct snmp_log_message *)serverarg;
! 46: char *msg = strdup (slm->msg);
! 47: if (msg) msg[strlen(msg)-1] = '\0';
! 48: switch (slm->priority)
! 49: {
! 50: case LOG_EMERG: zlog_err ("snmp[emerg]: %s", msg?msg:slm->msg); break;
! 51: case LOG_ALERT: zlog_err ("snmp[alert]: %s", msg?msg:slm->msg); break;
! 52: case LOG_CRIT: zlog_err ("snmp[crit]: %s", msg?msg:slm->msg); break;
! 53: case LOG_ERR: zlog_err ("snmp[err]: %s", msg?msg:slm->msg); break;
! 54: case LOG_WARNING: zlog_warn ("snmp[warning]: %s", msg?msg:slm->msg); break;
! 55: case LOG_NOTICE: zlog_notice("snmp[notice]: %s", msg?msg:slm->msg); break;
! 56: case LOG_INFO: zlog_info ("snmp[info]: %s", msg?msg:slm->msg); break;
! 57: case LOG_DEBUG: zlog_debug ("snmp[debug]: %s", msg?msg:slm->msg); break;
! 58: }
! 59: free(msg);
! 60: return SNMP_ERR_NOERROR;
! 61: }
! 62:
! 63: static int
! 64: config_write_agentx (struct vty *vty)
! 65: {
! 66: if (agentx_enabled)
! 67: vty_out (vty, "agentx%s", VTY_NEWLINE);
! 68: return 0;
! 69: }
! 70:
! 71: DEFUN (agentx_enable,
! 72: agentx_enable_cmd,
! 73: "agentx",
! 74: "SNMP AgentX protocol settings\n"
! 75: "SNMP AgentX settings\n")
! 76: {
! 77: if (!agentx_enabled)
! 78: {
! 79: init_snmp("quagga");
! 80: agentx_enabled = 1;
! 81: return CMD_SUCCESS;
! 82: }
! 83: vty_out (vty, "SNMP AgentX already enabled%s", VTY_NEWLINE);
! 84: return CMD_WARNING;
! 85: }
! 86:
! 87: DEFUN (no_agentx,
! 88: no_agentx_cmd,
! 89: "no agentx",
! 90: NO_STR
! 91: "SNMP AgentX protocol settings\n"
! 92: "SNMP AgentX settings\n")
! 93: {
! 94: if (!agentx_enabled) return CMD_SUCCESS;
! 95: vty_out (vty, "SNMP AgentX support cannot be disabled once enabled%s", VTY_NEWLINE);
! 96: return CMD_WARNING;
! 97: }
! 98:
! 99: void
! 100: smux_init (struct thread_master *tm)
! 101: {
! 102: netsnmp_enable_subagent ();
! 103: snmp_disable_log ();
! 104: snmp_enable_calllog ();
! 105: snmp_register_callback (SNMP_CALLBACK_LIBRARY,
! 106: SNMP_CALLBACK_LOGGING,
! 107: agentx_log_callback,
! 108: NULL);
! 109: init_agent ("quagga");
! 110:
! 111: install_node (&agentx_node, config_write_agentx);
! 112: install_element (CONFIG_NODE, &agentx_enable_cmd);
! 113: install_element (CONFIG_NODE, &no_agentx_cmd);
! 114: }
! 115:
! 116: void
! 117: smux_register_mib (const char *descr, struct variable *var,
! 118: size_t width, int num,
! 119: oid name[], size_t namelen)
! 120: {
! 121: register_mib (descr, var, width, num, name, namelen);
! 122: }
! 123:
! 124: int
! 125: smux_trap (struct variable *vp, size_t vp_len,
! 126: const oid *ename, size_t enamelen,
! 127: const oid *name, size_t namelen,
! 128: const oid *iname, size_t inamelen,
! 129: const struct trap_object *trapobj, size_t trapobjlen,
! 130: u_char sptrap)
! 131: {
! 132: oid objid_snmptrap[] = { 1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0 };
! 133: size_t objid_snmptrap_len = sizeof objid_snmptrap / sizeof (oid);
! 134: oid notification_oid[MAX_OID_LEN];
! 135: size_t notification_oid_len;
! 136: unsigned int i;
! 137:
! 138: netsnmp_variable_list *notification_vars = NULL;
! 139: if (!agentx_enabled) return 0;
! 140:
! 141: /* snmpTrapOID */
! 142: oid_copy (notification_oid, ename, enamelen);
! 143: notification_oid[enamelen] = sptrap;
! 144: notification_oid_len = enamelen + 1;
! 145: snmp_varlist_add_variable (¬ification_vars,
! 146: objid_snmptrap, objid_snmptrap_len,
! 147: ASN_OBJECT_ID,
! 148: (u_char *) notification_oid,
! 149: notification_oid_len * sizeof(oid));
! 150:
! 151: /* Provided bindings */
! 152: for (i = 0; i < trapobjlen; i++)
! 153: {
! 154: unsigned int j;
! 155: oid oid[MAX_OID_LEN];
! 156: size_t oid_len, onamelen;
! 157: u_char *val;
! 158: size_t val_len;
! 159: WriteMethod *wm = NULL;
! 160: struct variable cvp;
! 161:
! 162: /* Make OID. */
! 163: if (trapobj[i].namelen > 0)
! 164: {
! 165: /* Columnar object */
! 166: onamelen = trapobj[i].namelen;
! 167: oid_copy (oid, name, namelen);
! 168: oid_copy (oid + namelen, trapobj[i].name, onamelen);
! 169: oid_copy (oid + namelen + onamelen, iname, inamelen);
! 170: oid_len = namelen + onamelen + inamelen;
! 171: }
! 172: else
! 173: {
! 174: /* Scalar object */
! 175: onamelen = trapobj[i].namelen * (-1);
! 176: oid_copy (oid, name, namelen);
! 177: oid_copy (oid + namelen, trapobj[i].name, onamelen);
! 178: oid[onamelen + namelen] = 0;
! 179: oid_len = namelen + onamelen + 1;
! 180: }
! 181:
! 182: /* Locate the appropriate function and type in the MIB registry. */
! 183: for (j = 0; j < vp_len; j++)
! 184: {
! 185: if (oid_compare (trapobj[i].name, onamelen, vp[j].name, vp[j].namelen) != 0)
! 186: continue;
! 187: /* We found the appropriate variable in the MIB registry. */
! 188: oid_copy(cvp.name, name, namelen);
! 189: oid_copy(cvp.name + namelen, vp[j].name, vp[j].namelen);
! 190: cvp.namelen = namelen + vp[j].namelen;
! 191: cvp.type = vp[j].type;
! 192: cvp.magic = vp[j].magic;
! 193: cvp.acl = vp[j].acl;
! 194: cvp.findVar = vp[j].findVar;
! 195: /* Grab the result. */
! 196: val = cvp.findVar (&cvp, oid, &oid_len, 1, &val_len, &wm);
! 197: if (!val) break;
! 198: snmp_varlist_add_variable (¬ification_vars,
! 199: oid, oid_len,
! 200: vp[j].type,
! 201: val,
! 202: val_len);
! 203: break;
! 204: }
! 205: }
! 206:
! 207:
! 208: send_v2trap (notification_vars);
! 209: snmp_free_varbind (notification_vars);
! 210: return 1;
! 211: }
! 212:
! 213: #endif /* HAVE_SNMP */
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