[mirror_frr.git] / lib / agentx.c

/* 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 this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>

#ifdef SNMP_AGENTX
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include <net-snmp/agent/snmp_vars.h>

#include "command.h"
#include "smux.h"
#include "memory.h"
#include "linklist.h"
#include "version.h"
#include "lib_errors.h"
#include "xref.h"

XREF_SETUP();

DEFINE_HOOK(agentx_enabled, (), ());

static int agentx_enabled = 0;

static struct thread_master *agentx_tm;
static struct thread *timeout_thr = NULL;
static struct list *events = NULL;

static void agentx_events_update(void);

static int agentx_timeout(struct thread *t)
{
	timeout_thr = NULL;

	snmp_timeout();
	run_alarms();
	netsnmp_check_outstanding_agent_requests();
	agentx_events_update();
	return 0;
}

static int agentx_read(struct thread *t)
{
	fd_set fds;
	int flags, new_flags = 0;
	int nonblock = false;
	struct listnode *ln = THREAD_ARG(t);
	list_delete_node(events, ln);

	/* fix for non blocking socket */
	flags = fcntl(THREAD_FD(t), F_GETFL, 0);
	if (-1 == flags) {
		flog_err(EC_LIB_SYSTEM_CALL, "Failed to get FD settings fcntl: %s(%d)",
			 strerror(errno), errno);
		return -1;
	}

	if (flags & O_NONBLOCK)
		nonblock = true;
	else
		new_flags = fcntl(THREAD_FD(t), F_SETFL, flags | O_NONBLOCK);

	if (new_flags == -1)
		flog_err(EC_LIB_SYSTEM_CALL, "Failed to set snmp fd non blocking: %s(%d)",
			 strerror(errno), errno);

	FD_ZERO(&fds);
	FD_SET(THREAD_FD(t), &fds);
	snmp_read(&fds);

	/* Reset the flag */
	if (!nonblock) {
		new_flags = fcntl(THREAD_FD(t), F_SETFL, flags);

		if (new_flags == -1)
			flog_err(
				EC_LIB_SYSTEM_CALL,
				"Failed to set snmp fd back to original settings: %s(%d)",
				strerror(errno), errno);
	}

	netsnmp_check_outstanding_agent_requests();
	agentx_events_update();
	return 0;
}

static void agentx_events_update(void)
{
	int maxfd = 0;
	int block = 1;
	struct timeval timeout = {.tv_sec = 0, .tv_usec = 0};
	fd_set fds;
	struct listnode *ln;
	struct thread *thr;
	int fd, thr_fd;

	thread_cancel(&timeout_thr);

	FD_ZERO(&fds);
	snmp_select_info(&maxfd, &fds, &timeout, &block);

	if (!block) {
		timeout_thr = NULL;
		thread_add_timer_tv(agentx_tm, agentx_timeout, NULL, &timeout,
				    &timeout_thr);
	}

	ln = listhead(events);
	thr = ln ? listgetdata(ln) : NULL;
	thr_fd = thr ? THREAD_FD(thr) : -1;

	/* "two-pointer" / two-list simultaneous iteration
	 * ln/thr/thr_fd point to the next existing event listener to hit while
	 * fd counts to catch up */
	for (fd = 0; fd < maxfd; fd++) {
		/* caught up */
		if (thr_fd == fd) {
			struct listnode *nextln = listnextnode(ln);
			if (!FD_ISSET(fd, &fds)) {
				thread_cancel(&thr);
				list_delete_node(events, ln);
			}
			ln = nextln;
			thr = ln ? listgetdata(ln) : NULL;
			thr_fd = thr ? THREAD_FD(thr) : -1;
		}
		/* need listener, but haven't hit one where it would be */
		else if (FD_ISSET(fd, &fds)) {
			struct listnode *newln;
			thr = NULL;
			thread_add_read(agentx_tm, agentx_read, NULL, fd, &thr);
			newln = listnode_add_before(events, ln, thr);
			thr->arg = newln;
		}
	}

	/* leftover event listeners at this point have fd > maxfd, delete them
	 */
	while (ln) {
		struct listnode *nextln = listnextnode(ln);
		thr = listgetdata(ln);
		thread_cancel(&thr);
		list_delete_node(events, ln);
		ln = nextln;
	}
}

/* AgentX node. */
static int config_write_agentx(struct vty *vty);
static struct cmd_node agentx_node = {
	.name = "smux",
	.node = SMUX_NODE,
	.prompt = "",
	.config_write = config_write_agentx,
};

/* 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 = XSTRDUP(MTYPE_TMP, slm->msg);
	if (msg)
		msg[strlen(msg) - 1] = '\0';
	switch (slm->priority) {
	case LOG_EMERG:
		flog_err(EC_LIB_SNMP, "snmp[emerg]: %s", msg ? msg : slm->msg);
		break;
	case LOG_ALERT:
		flog_err(EC_LIB_SNMP, "snmp[alert]: %s", msg ? msg : slm->msg);
		break;
	case LOG_CRIT:
		flog_err(EC_LIB_SNMP, "snmp[crit]: %s", msg ? msg : slm->msg);
		break;
	case LOG_ERR:
		flog_err(EC_LIB_SNMP, "snmp[err]: %s", msg ? msg : slm->msg);
		break;
	case LOG_WARNING:
		flog_warn(EC_LIB_SNMP, "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;
	}
	XFREE(MTYPE_TMP, msg);
	return SNMP_ERR_NOERROR;
}

static int config_write_agentx(struct vty *vty)
{
	if (agentx_enabled)
		vty_out(vty, "agentx\n");
	return 1;
}

DEFUN (agentx_enable,
       agentx_enable_cmd,
       "agentx",
       "SNMP AgentX protocol settings\n")
{
	if (!agentx_enabled) {
		init_snmp(FRR_SMUX_NAME);
		events = list_new();
		agentx_events_update();
		agentx_enabled = 1;
		hook_call(agentx_enabled);
	}

	return CMD_SUCCESS;
}

DEFUN (no_agentx,
       no_agentx_cmd,
       "no agentx",
       NO_STR
       "SNMP AgentX protocol settings\n")
{
	if (!agentx_enabled)
		return CMD_SUCCESS;
	vty_out(vty, "SNMP AgentX support cannot be disabled once enabled\n");
	return CMD_WARNING_CONFIG_FAILED;
}

int smux_enabled(void)
{
	return agentx_enabled;
}

void smux_init(struct thread_master *tm)
{
	agentx_tm = 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(FRR_SMUX_NAME);

	install_node(&agentx_node);
	install_element(CONFIG_NODE, &agentx_enable_cmd);
	install_element(CONFIG_NODE, &no_agentx_cmd);
}

void smux_agentx_enable(void)
{
	if (!agentx_enabled) {
		init_snmp(FRR_SMUX_NAME);
		events = list_new();
		agentx_events_update();
		agentx_enabled = 1;
	}
}

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);
}

void 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,
	       uint8_t sptrap)
{
	struct index_oid trap_index[1];

	/* copy the single index into the multi-index format */
	oid_copy(trap_index[0].indexname, iname, inamelen);
	trap_index[0].indexlen = inamelen;

	smux_trap_multi_index(vp, vp_len, ename, enamelen, name, namelen,
			      trap_index, array_size(trap_index), trapobj,
			      trapobjlen, sptrap);
}

int smux_trap_multi_index(struct variable *vp, size_t vp_len, const oid *ename,
			  size_t enamelen, const oid *name, size_t namelen,
			  struct index_oid *iname, size_t index_len,
			  const struct trap_object *trapobj, size_t trapobjlen,
			  uint8_t 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,
				  (uint8_t *)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;
		uint8_t *val;
		size_t val_len;
		WriteMethod *wm = NULL;
		struct variable cvp;
		unsigned int iindex;
		/*
		 * this allows the behaviour of smux_trap with a singe index
		 * for all objects to be maintained whilst allowing traps which
		 * have different indices per object to be supported
		 */
		iindex = (index_len == 1) ? 0 : i;

		/* 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[iindex].indexname,
				 iname[iindex].indexlen);
			oid_len = namelen + onamelen + iname[iindex].indexlen;
		} 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);
	agentx_events_update();
	return 1;
}

void smux_events_update(void)
{
	agentx_events_update();
}

#endif /* SNMP_AGENTX */
Commit	Line	Data
d6be5fb9 VB	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	*
896014f4 DL	16	* You should have received a copy of the GNU General Public License along
	17	* with this program; see the file COPYING; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
d6be5fb9 VB	19	*/
	20
	21	#include <zebra.h>
	22
5986b66b	23	#ifdef SNMP_AGENTX
d6be5fb9 VB	24	#include <net-snmp/net-snmp-config.h>
d6be5fb9 VB	25	#include <net-snmp/net-snmp-includes.h>
56e2c5e8 DL	26	#include <net-snmp/agent/net-snmp-agent-includes.h>
56e2c5e8 DL	27	#include <net-snmp/agent/snmp_vars.h>
d6be5fb9 VB	28
	29	#include "command.h"
	30	#include "smux.h"
d11f748b	31	#include "memory.h"
56e2c5e8	32	#include "linklist.h"
ae435b19	33	#include "version.h"
220d7368	34	#include "lib_errors.h"
b2fa8c0f DL	35	#include "xref.h"
b2fa8c0f DL	36
80413c20	37	XREF_SETUP();
d6be5fb9	38
8451921b	39	DEFINE_HOOK(agentx_enabled, (), ());
ec48460e	40
56e2c5e8 DL	41	static int agentx_enabled = 0;
	42
	43	static struct thread_master *agentx_tm;
	44	static struct thread *timeout_thr = NULL;
	45	static struct list *events = NULL;
	46
	47	static void agentx_events_update(void);
	48
d62a17ae	49	static int agentx_timeout(struct thread *t)
56e2c5e8	50	{
d62a17ae	51	timeout_thr = NULL;
56e2c5e8	52
d62a17ae	53	snmp_timeout();
	54	run_alarms();
	55	netsnmp_check_outstanding_agent_requests();
	56	agentx_events_update();
	57	return 0;
56e2c5e8 DL	58	}
56e2c5e8 DL	59
d62a17ae	60	static int agentx_read(struct thread *t)
56e2c5e8	61	{
d62a17ae	62	fd_set fds;
19d95d40	63	int flags, new_flags = 0;
3b717261	64	int nonblock = false;
d62a17ae	65	struct listnode *ln = THREAD_ARG(t);
d62a17ae	66	list_delete_node(events, ln);
56e2c5e8	67
3b717261	68	/* fix for non blocking socket */
3b717261	69	flags = fcntl(THREAD_FD(t), F_GETFL, 0);
19d95d40 DS	70	if (-1 == flags) {
	71	flog_err(EC_LIB_SYSTEM_CALL, "Failed to get FD settings fcntl: %s(%d)",
	72	strerror(errno), errno);
3b717261	73	return -1;
19d95d40	74	}
3b717261	75
	76	if (flags & O_NONBLOCK)
	77	nonblock = true;
	78	else
19d95d40 DS	79	new_flags = fcntl(THREAD_FD(t), F_SETFL, flags \| O_NONBLOCK);
	80
	81	if (new_flags == -1)
	82	flog_err(EC_LIB_SYSTEM_CALL, "Failed to set snmp fd non blocking: %s(%d)",
	83	strerror(errno), errno);
3b717261	84
d62a17ae	85	FD_ZERO(&fds);
	86	FD_SET(THREAD_FD(t), &fds);
	87	snmp_read(&fds);
56e2c5e8	88
3b717261	89	/* Reset the flag */
19d95d40 DS	90	if (!nonblock) {
	91	new_flags = fcntl(THREAD_FD(t), F_SETFL, flags);
	92
	93	if (new_flags == -1)
	94	flog_err(
	95	EC_LIB_SYSTEM_CALL,
	96	"Failed to set snmp fd back to original settings: %s(%d)",
	97	strerror(errno), errno);
	98	}
3b717261	99
d62a17ae	100	netsnmp_check_outstanding_agent_requests();
	101	agentx_events_update();
	102	return 0;
56e2c5e8 DL	103	}
56e2c5e8 DL	104
d62a17ae	105	static void agentx_events_update(void)
56e2c5e8	106	{
d62a17ae	107	int maxfd = 0;
	108	int block = 1;
	109	struct timeval timeout = {.tv_sec = 0, .tv_usec = 0};
	110	fd_set fds;
	111	struct listnode *ln;
	112	struct thread *thr;
	113	int fd, thr_fd;
	114
50478845	115	thread_cancel(&timeout_thr);
d62a17ae	116
	117	FD_ZERO(&fds);
	118	snmp_select_info(&maxfd, &fds, &timeout, &block);
	119
	120	if (!block) {
	121	timeout_thr = NULL;
	122	thread_add_timer_tv(agentx_tm, agentx_timeout, NULL, &timeout,
	123	&timeout_thr);
	124	}
	125
	126	ln = listhead(events);
	127	thr = ln ? listgetdata(ln) : NULL;
	128	thr_fd = thr ? THREAD_FD(thr) : -1;
	129
	130	/* "two-pointer" / two-list simultaneous iteration
	131	* ln/thr/thr_fd point to the next existing event listener to hit while
	132	* fd counts to catch up */
	133	for (fd = 0; fd < maxfd; fd++) {
	134	/* caught up */
	135	if (thr_fd == fd) {
	136	struct listnode *nextln = listnextnode(ln);
	137	if (!FD_ISSET(fd, &fds)) {
b3d6bc6e	138	thread_cancel(&thr);
d62a17ae	139	list_delete_node(events, ln);
	140	}
	141	ln = nextln;
	142	thr = ln ? listgetdata(ln) : NULL;
	143	thr_fd = thr ? THREAD_FD(thr) : -1;
	144	}
	145	/* need listener, but haven't hit one where it would be */
	146	else if (FD_ISSET(fd, &fds)) {
	147	struct listnode *newln;
	148	thr = NULL;
	149	thread_add_read(agentx_tm, agentx_read, NULL, fd, &thr);
	150	newln = listnode_add_before(events, ln, thr);
	151	thr->arg = newln;
	152	}
	153	}
	154
	155	/* leftover event listeners at this point have fd > maxfd, delete them
	156	*/
	157	while (ln) {
	158	struct listnode *nextln = listnextnode(ln);
b3d6bc6e MS	159	thr = listgetdata(ln);
b3d6bc6e MS	160	thread_cancel(&thr);
d62a17ae	161	list_delete_node(events, ln);
	162	ln = nextln;
	163	}
56e2c5e8	164	}
d6be5fb9 VB	165
d6be5fb9 VB	166	/* AgentX node. */
612c2c15	167	static int config_write_agentx(struct vty *vty);
62b346ee	168	static struct cmd_node agentx_node = {
f4b8291f	169	.name = "smux",
62b346ee DL	170	.node = SMUX_NODE,
62b346ee DL	171	.prompt = "",
612c2c15	172	.config_write = config_write_agentx,
62b346ee	173	};
d6be5fb9 VB	174
d6be5fb9 VB	175	/* Logging NetSNMP messages */
d62a17ae	176	static int agentx_log_callback(int major, int minor, void *serverarg,
d62a17ae	177	void *clientarg)
d6be5fb9	178	{
d62a17ae	179	struct snmp_log_message slm = (struct snmp_log_message )serverarg;
	180	char *msg = XSTRDUP(MTYPE_TMP, slm->msg);
	181	if (msg)
	182	msg[strlen(msg) - 1] = '\0';
	183	switch (slm->priority) {
	184	case LOG_EMERG:
1c50c1c0	185	flog_err(EC_LIB_SNMP, "snmp[emerg]: %s", msg ? msg : slm->msg);
d62a17ae	186	break;
d62a17ae	187	case LOG_ALERT:
1c50c1c0	188	flog_err(EC_LIB_SNMP, "snmp[alert]: %s", msg ? msg : slm->msg);
d62a17ae	189	break;
d62a17ae	190	case LOG_CRIT:
1c50c1c0	191	flog_err(EC_LIB_SNMP, "snmp[crit]: %s", msg ? msg : slm->msg);
d62a17ae	192	break;
d62a17ae	193	case LOG_ERR:
1c50c1c0	194	flog_err(EC_LIB_SNMP, "snmp[err]: %s", msg ? msg : slm->msg);
d62a17ae	195	break;
d62a17ae	196	case LOG_WARNING:
450971aa	197	flog_warn(EC_LIB_SNMP, "snmp[warning]: %s",
ade6974d	198	msg ? msg : slm->msg);
d62a17ae	199	break;
	200	case LOG_NOTICE:
	201	zlog_notice("snmp[notice]: %s", msg ? msg : slm->msg);
	202	break;
	203	case LOG_INFO:
	204	zlog_info("snmp[info]: %s", msg ? msg : slm->msg);
	205	break;
	206	case LOG_DEBUG:
	207	zlog_debug("snmp[debug]: %s", msg ? msg : slm->msg);
	208	break;
	209	}
	210	XFREE(MTYPE_TMP, msg);
	211	return SNMP_ERR_NOERROR;
d6be5fb9 VB	212	}
d6be5fb9 VB	213
d62a17ae	214	static int config_write_agentx(struct vty *vty)
d6be5fb9	215	{
d62a17ae	216	if (agentx_enabled)
	217	vty_out(vty, "agentx\n");
	218	return 1;
d6be5fb9 VB	219	}
	220
	221	DEFUN (agentx_enable,
	222	agentx_enable_cmd,
	223	"agentx",
007b0667	224	"SNMP AgentX protocol settings\n")
d6be5fb9	225	{
d62a17ae	226	if (!agentx_enabled) {
	227	init_snmp(FRR_SMUX_NAME);
	228	events = list_new();
	229	agentx_events_update();
	230	agentx_enabled = 1;
ec48460e	231	hook_call(agentx_enabled);
d62a17ae	232	}
5fedee18	233
d62a17ae	234	return CMD_SUCCESS;
d6be5fb9 VB	235	}
	236
	237	DEFUN (no_agentx,
	238	no_agentx_cmd,
	239	"no agentx",
	240	NO_STR
007b0667	241	"SNMP AgentX protocol settings\n")
d6be5fb9	242	{
d62a17ae	243	if (!agentx_enabled)
	244	return CMD_SUCCESS;
	245	vty_out(vty, "SNMP AgentX support cannot be disabled once enabled\n");
	246	return CMD_WARNING_CONFIG_FAILED;
d6be5fb9 VB	247	}
d6be5fb9 VB	248
1ee746d9	249	int smux_enabled(void)
	250	{
	251	return agentx_enabled;
	252	}
	253
d62a17ae	254	void smux_init(struct thread_master *tm)
d6be5fb9	255	{
d62a17ae	256	agentx_tm = tm;
	257
	258	netsnmp_enable_subagent();
	259	snmp_disable_log();
	260	snmp_enable_calllog();
	261	snmp_register_callback(SNMP_CALLBACK_LIBRARY, SNMP_CALLBACK_LOGGING,
	262	agentx_log_callback, NULL);
	263	init_agent(FRR_SMUX_NAME);
	264
612c2c15	265	install_node(&agentx_node);
d62a17ae	266	install_element(CONFIG_NODE, &agentx_enable_cmd);
d62a17ae	267	install_element(CONFIG_NODE, &no_agentx_cmd);
d6be5fb9 VB	268	}
d6be5fb9 VB	269
ec48460e KS	270	void smux_agentx_enable(void)
	271	{
	272	if (!agentx_enabled) {
	273	init_snmp(FRR_SMUX_NAME);
	274	events = list_new();
	275	agentx_events_update();
	276	agentx_enabled = 1;
	277	}
	278	}
	279
d62a17ae	280	void smux_register_mib(const char descr, struct variable var, size_t width,
d62a17ae	281	int num, oid name[], size_t namelen)
d6be5fb9	282	{
d62a17ae	283	register_mib(descr, var, width, num, name, namelen);
d6be5fb9 VB	284	}
d6be5fb9 VB	285
97e21b4b DS	286	void smux_trap(struct variable vp, size_t vp_len, const oid ename,
	287	size_t enamelen, const oid *name, size_t namelen,
	288	const oid *iname, size_t inamelen,
	289	const struct trap_object *trapobj, size_t trapobjlen,
	290	uint8_t sptrap)
4eb8c74f PR	291	{
	292	struct index_oid trap_index[1];
	293
	294	/* copy the single index into the multi-index format */
	295	oid_copy(trap_index[0].indexname, iname, inamelen);
	296	trap_index[0].indexlen = inamelen;
	297
97e21b4b DS	298	smux_trap_multi_index(vp, vp_len, ename, enamelen, name, namelen,
	299	trap_index, array_size(trap_index), trapobj,
	300	trapobjlen, sptrap);
4eb8c74f PR	301	}
	302
	303	int smux_trap_multi_index(struct variable vp, size_t vp_len, const oid ename,
	304	size_t enamelen, const oid *name, size_t namelen,
	305	struct index_oid *iname, size_t index_len,
	306	const struct trap_object *trapobj, size_t trapobjlen,
	307	uint8_t sptrap)
d6be5fb9	308	{
d62a17ae	309	oid objid_snmptrap[] = {1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0};
0d6f7fd6	310	size_t objid_snmptrap_len = sizeof(objid_snmptrap) / sizeof(oid);
d62a17ae	311	oid notification_oid[MAX_OID_LEN];
	312	size_t notification_oid_len;
	313	unsigned int i;
	314
	315	netsnmp_variable_list *notification_vars = NULL;
	316	if (!agentx_enabled)
	317	return 0;
	318
	319	/* snmpTrapOID */
	320	oid_copy(notification_oid, ename, enamelen);
	321	notification_oid[enamelen] = sptrap;
	322	notification_oid_len = enamelen + 1;
	323	snmp_varlist_add_variable(&notification_vars, objid_snmptrap,
	324	objid_snmptrap_len, ASN_OBJECT_ID,
d7c0a89a	325	(uint8_t *)notification_oid,
d62a17ae	326	notification_oid_len * sizeof(oid));
	327
	328	/* Provided bindings */
	329	for (i = 0; i < trapobjlen; i++) {
	330	unsigned int j;
	331	oid oid[MAX_OID_LEN];
	332	size_t oid_len, onamelen;
d7c0a89a	333	uint8_t *val;
d62a17ae	334	size_t val_len;
	335	WriteMethod *wm = NULL;
	336	struct variable cvp;
4eb8c74f PR	337	unsigned int iindex;
	338	/*
	339	* this allows the behaviour of smux_trap with a singe index
	340	* for all objects to be maintained whilst allowing traps which
	341	* have different indices per object to be supported
	342	*/
	343	iindex = (index_len == 1) ? 0 : i;
d62a17ae	344
	345	/* Make OID. */
	346	if (trapobj[i].namelen > 0) {
	347	/* Columnar object */
	348	onamelen = trapobj[i].namelen;
	349	oid_copy(oid, name, namelen);
	350	oid_copy(oid + namelen, trapobj[i].name, onamelen);
4eb8c74f PR	351	oid_copy(oid + namelen + onamelen,
	352	iname[iindex].indexname,
	353	iname[iindex].indexlen);
	354	oid_len = namelen + onamelen + iname[iindex].indexlen;
d62a17ae	355	} else {
	356	/* Scalar object */
	357	onamelen = trapobj[i].namelen * (-1);
	358	oid_copy(oid, name, namelen);
	359	oid_copy(oid + namelen, trapobj[i].name, onamelen);
	360	oid[onamelen + namelen] = 0;
	361	oid_len = namelen + onamelen + 1;
	362	}
	363
	364	/* Locate the appropriate function and type in the MIB registry.
	365	*/
	366	for (j = 0; j < vp_len; j++) {
	367	if (oid_compare(trapobj[i].name, onamelen, vp[j].name,
	368	vp[j].namelen)
	369	!= 0)
	370	continue;
	371	/* We found the appropriate variable in the MIB
	372	* registry. */
	373	oid_copy(cvp.name, name, namelen);
	374	oid_copy(cvp.name + namelen, vp[j].name, vp[j].namelen);
	375	cvp.namelen = namelen + vp[j].namelen;
	376	cvp.type = vp[j].type;
	377	cvp.magic = vp[j].magic;
	378	cvp.acl = vp[j].acl;
	379	cvp.findVar = vp[j].findVar;
4eb8c74f	380
d62a17ae	381	/* Grab the result. */
	382	val = cvp.findVar(&cvp, oid, &oid_len, 1, &val_len,
	383	&wm);
	384	if (!val)
	385	break;
	386	snmp_varlist_add_variable(&notification_vars, oid,
	387	oid_len, vp[j].type, val,
	388	val_len);
	389	break;
	390	}
b7c0d065	391	}
b7c0d065 VB	392
b7c0d065 VB	393
d62a17ae	394	send_v2trap(notification_vars);
	395	snmp_free_varbind(notification_vars);
	396	agentx_events_update();
	397	return 1;
d6be5fb9 VB	398	}
d6be5fb9 VB	399
1ee746d9	400	void smux_events_update(void)
	401	{
	402	agentx_events_update();
	403	}
	404
5986b66b	405	#endif /* SNMP_AGENTX */