[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 "lib/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 void agentx_timeout(struct thread *t)
{
	timeout_thr = NULL;

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

static void agentx_read(struct thread *t)
{
	fd_set fds;
	int flags, new_flags = 0;
	int nonblock = false;
	struct listnode *ln = THREAD_ARG(t);
	struct thread **thr = listgetdata(ln);
	XFREE(MTYPE_TMP, thr);
	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;
	}

	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();
}

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);
				XFREE(MTYPE_TMP, 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 = XCALLOC(MTYPE_TMP, sizeof(struct thread *));
			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);
		XFREE(MTYPE_TMP, 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"
09781197	33	#include "lib/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
cc9f21da	49	static void 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();
56e2c5e8 DL	57	}
56e2c5e8 DL	58
cc9f21da	59	static void agentx_read(struct thread *t)
56e2c5e8	60	{
d62a17ae	61	fd_set fds;
19d95d40	62	int flags, new_flags = 0;
3b717261	63	int nonblock = false;
d62a17ae	64	struct listnode *ln = THREAD_ARG(t);
7640e3c6 IR	65	struct thread **thr = listgetdata(ln);
7640e3c6 IR	66	XFREE(MTYPE_TMP, thr);
d62a17ae	67	list_delete_node(events, ln);
56e2c5e8	68
3b717261	69	/* fix for non blocking socket */
3b717261	70	flags = fcntl(THREAD_FD(t), F_GETFL, 0);
19d95d40 DS	71	if (-1 == flags) {
	72	flog_err(EC_LIB_SYSTEM_CALL, "Failed to get FD settings fcntl: %s(%d)",
	73	strerror(errno), errno);
cc9f21da	74	return;
19d95d40	75	}
3b717261	76
	77	if (flags & O_NONBLOCK)
	78	nonblock = true;
	79	else
19d95d40 DS	80	new_flags = fcntl(THREAD_FD(t), F_SETFL, flags \| O_NONBLOCK);
	81
	82	if (new_flags == -1)
	83	flog_err(EC_LIB_SYSTEM_CALL, "Failed to set snmp fd non blocking: %s(%d)",
	84	strerror(errno), errno);
3b717261	85
d62a17ae	86	FD_ZERO(&fds);
	87	FD_SET(THREAD_FD(t), &fds);
	88	snmp_read(&fds);
56e2c5e8	89
3b717261	90	/* Reset the flag */
19d95d40 DS	91	if (!nonblock) {
	92	new_flags = fcntl(THREAD_FD(t), F_SETFL, flags);
	93
	94	if (new_flags == -1)
	95	flog_err(
	96	EC_LIB_SYSTEM_CALL,
	97	"Failed to set snmp fd back to original settings: %s(%d)",
	98	strerror(errno), errno);
	99	}
3b717261	100
d62a17ae	101	netsnmp_check_outstanding_agent_requests();
d62a17ae	102	agentx_events_update();
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;
7640e3c6	112	struct thread **thr;
d62a17ae	113	int fd, thr_fd;
d62a17ae	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;
7640e3c6	128	thr_fd = thr ? THREAD_FD(*thr) : -1;
d62a17ae	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)) {
7640e3c6 IR	138	thread_cancel(thr);
7640e3c6 IR	139	XFREE(MTYPE_TMP, thr);
d62a17ae	140	list_delete_node(events, ln);
	141	}
	142	ln = nextln;
	143	thr = ln ? listgetdata(ln) : NULL;
7640e3c6	144	thr_fd = thr ? THREAD_FD(*thr) : -1;
d62a17ae	145	}
	146	/* need listener, but haven't hit one where it would be */
	147	else if (FD_ISSET(fd, &fds)) {
	148	struct listnode *newln;
7640e3c6 IR	149	thr = XCALLOC(MTYPE_TMP, sizeof(struct thread *));
7640e3c6 IR	150	thread_add_read(agentx_tm, agentx_read, NULL, fd, thr);
d62a17ae	151	newln = listnode_add_before(events, ln, thr);
7640e3c6	152	(*thr)->arg = newln;
d62a17ae	153	}
	154	}
	155
	156	/* leftover event listeners at this point have fd > maxfd, delete them
	157	*/
	158	while (ln) {
	159	struct listnode *nextln = listnextnode(ln);
b3d6bc6e	160	thr = listgetdata(ln);
7640e3c6 IR	161	thread_cancel(thr);
7640e3c6 IR	162	XFREE(MTYPE_TMP, thr);
d62a17ae	163	list_delete_node(events, ln);
	164	ln = nextln;
	165	}
56e2c5e8	166	}
d6be5fb9 VB	167
d6be5fb9 VB	168	/* AgentX node. */
612c2c15	169	static int config_write_agentx(struct vty *vty);
62b346ee	170	static struct cmd_node agentx_node = {
f4b8291f	171	.name = "smux",
62b346ee DL	172	.node = SMUX_NODE,
62b346ee DL	173	.prompt = "",
612c2c15	174	.config_write = config_write_agentx,
62b346ee	175	};
d6be5fb9 VB	176
d6be5fb9 VB	177	/* Logging NetSNMP messages */
d62a17ae	178	static int agentx_log_callback(int major, int minor, void *serverarg,
d62a17ae	179	void *clientarg)
d6be5fb9	180	{
d62a17ae	181	struct snmp_log_message slm = (struct snmp_log_message )serverarg;
	182	char *msg = XSTRDUP(MTYPE_TMP, slm->msg);
	183	if (msg)
	184	msg[strlen(msg) - 1] = '\0';
	185	switch (slm->priority) {
	186	case LOG_EMERG:
1c50c1c0	187	flog_err(EC_LIB_SNMP, "snmp[emerg]: %s", msg ? msg : slm->msg);
d62a17ae	188	break;
d62a17ae	189	case LOG_ALERT:
1c50c1c0	190	flog_err(EC_LIB_SNMP, "snmp[alert]: %s", msg ? msg : slm->msg);
d62a17ae	191	break;
d62a17ae	192	case LOG_CRIT:
1c50c1c0	193	flog_err(EC_LIB_SNMP, "snmp[crit]: %s", msg ? msg : slm->msg);
d62a17ae	194	break;
d62a17ae	195	case LOG_ERR:
1c50c1c0	196	flog_err(EC_LIB_SNMP, "snmp[err]: %s", msg ? msg : slm->msg);
d62a17ae	197	break;
d62a17ae	198	case LOG_WARNING:
450971aa	199	flog_warn(EC_LIB_SNMP, "snmp[warning]: %s",
ade6974d	200	msg ? msg : slm->msg);
d62a17ae	201	break;
	202	case LOG_NOTICE:
	203	zlog_notice("snmp[notice]: %s", msg ? msg : slm->msg);
	204	break;
	205	case LOG_INFO:
	206	zlog_info("snmp[info]: %s", msg ? msg : slm->msg);
	207	break;
	208	case LOG_DEBUG:
	209	zlog_debug("snmp[debug]: %s", msg ? msg : slm->msg);
	210	break;
	211	}
	212	XFREE(MTYPE_TMP, msg);
	213	return SNMP_ERR_NOERROR;
d6be5fb9 VB	214	}
d6be5fb9 VB	215
d62a17ae	216	static int config_write_agentx(struct vty *vty)
d6be5fb9	217	{
d62a17ae	218	if (agentx_enabled)
	219	vty_out(vty, "agentx\n");
	220	return 1;
d6be5fb9 VB	221	}
	222
	223	DEFUN (agentx_enable,
	224	agentx_enable_cmd,
	225	"agentx",
007b0667	226	"SNMP AgentX protocol settings\n")
d6be5fb9	227	{
d62a17ae	228	if (!agentx_enabled) {
	229	init_snmp(FRR_SMUX_NAME);
	230	events = list_new();
	231	agentx_events_update();
	232	agentx_enabled = 1;
ec48460e	233	hook_call(agentx_enabled);
d62a17ae	234	}
5fedee18	235
d62a17ae	236	return CMD_SUCCESS;
d6be5fb9 VB	237	}
	238
	239	DEFUN (no_agentx,
	240	no_agentx_cmd,
	241	"no agentx",
	242	NO_STR
007b0667	243	"SNMP AgentX protocol settings\n")
d6be5fb9	244	{
d62a17ae	245	if (!agentx_enabled)
	246	return CMD_SUCCESS;
	247	vty_out(vty, "SNMP AgentX support cannot be disabled once enabled\n");
	248	return CMD_WARNING_CONFIG_FAILED;
d6be5fb9 VB	249	}
d6be5fb9 VB	250
1ee746d9	251	int smux_enabled(void)
	252	{
	253	return agentx_enabled;
	254	}
	255
d62a17ae	256	void smux_init(struct thread_master *tm)
d6be5fb9	257	{
d62a17ae	258	agentx_tm = tm;
	259
	260	netsnmp_enable_subagent();
	261	snmp_disable_log();
	262	snmp_enable_calllog();
	263	snmp_register_callback(SNMP_CALLBACK_LIBRARY, SNMP_CALLBACK_LOGGING,
	264	agentx_log_callback, NULL);
	265	init_agent(FRR_SMUX_NAME);
	266
612c2c15	267	install_node(&agentx_node);
d62a17ae	268	install_element(CONFIG_NODE, &agentx_enable_cmd);
d62a17ae	269	install_element(CONFIG_NODE, &no_agentx_cmd);
d6be5fb9 VB	270	}
d6be5fb9 VB	271
ec48460e KS	272	void smux_agentx_enable(void)
	273	{
	274	if (!agentx_enabled) {
	275	init_snmp(FRR_SMUX_NAME);
	276	events = list_new();
	277	agentx_events_update();
	278	agentx_enabled = 1;
	279	}
	280	}
	281
d62a17ae	282	void smux_register_mib(const char descr, struct variable var, size_t width,
d62a17ae	283	int num, oid name[], size_t namelen)
d6be5fb9	284	{
d62a17ae	285	register_mib(descr, var, width, num, name, namelen);
d6be5fb9 VB	286	}
d6be5fb9 VB	287
97e21b4b DS	288	void smux_trap(struct variable vp, size_t vp_len, const oid ename,
	289	size_t enamelen, const oid *name, size_t namelen,
	290	const oid *iname, size_t inamelen,
	291	const struct trap_object *trapobj, size_t trapobjlen,
	292	uint8_t sptrap)
4eb8c74f PR	293	{
	294	struct index_oid trap_index[1];
	295
	296	/* copy the single index into the multi-index format */
	297	oid_copy(trap_index[0].indexname, iname, inamelen);
	298	trap_index[0].indexlen = inamelen;
	299
97e21b4b DS	300	smux_trap_multi_index(vp, vp_len, ename, enamelen, name, namelen,
	301	trap_index, array_size(trap_index), trapobj,
	302	trapobjlen, sptrap);
4eb8c74f PR	303	}
	304
	305	int smux_trap_multi_index(struct variable vp, size_t vp_len, const oid ename,
	306	size_t enamelen, const oid *name, size_t namelen,
	307	struct index_oid *iname, size_t index_len,
	308	const struct trap_object *trapobj, size_t trapobjlen,
	309	uint8_t sptrap)
d6be5fb9	310	{
d62a17ae	311	oid objid_snmptrap[] = {1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0};
0d6f7fd6	312	size_t objid_snmptrap_len = sizeof(objid_snmptrap) / sizeof(oid);
d62a17ae	313	oid notification_oid[MAX_OID_LEN];
	314	size_t notification_oid_len;
	315	unsigned int i;
	316
	317	netsnmp_variable_list *notification_vars = NULL;
	318	if (!agentx_enabled)
	319	return 0;
	320
	321	/* snmpTrapOID */
	322	oid_copy(notification_oid, ename, enamelen);
	323	notification_oid[enamelen] = sptrap;
	324	notification_oid_len = enamelen + 1;
	325	snmp_varlist_add_variable(&notification_vars, objid_snmptrap,
	326	objid_snmptrap_len, ASN_OBJECT_ID,
d7c0a89a	327	(uint8_t *)notification_oid,
d62a17ae	328	notification_oid_len * sizeof(oid));
	329
	330	/* Provided bindings */
	331	for (i = 0; i < trapobjlen; i++) {
	332	unsigned int j;
	333	oid oid[MAX_OID_LEN];
	334	size_t oid_len, onamelen;
d7c0a89a	335	uint8_t *val;
d62a17ae	336	size_t val_len;
	337	WriteMethod *wm = NULL;
	338	struct variable cvp;
4eb8c74f PR	339	unsigned int iindex;
	340	/*
	341	* this allows the behaviour of smux_trap with a singe index
	342	* for all objects to be maintained whilst allowing traps which
	343	* have different indices per object to be supported
	344	*/
	345	iindex = (index_len == 1) ? 0 : i;
d62a17ae	346
	347	/* Make OID. */
	348	if (trapobj[i].namelen > 0) {
	349	/* Columnar object */
	350	onamelen = trapobj[i].namelen;
	351	oid_copy(oid, name, namelen);
	352	oid_copy(oid + namelen, trapobj[i].name, onamelen);
4eb8c74f PR	353	oid_copy(oid + namelen + onamelen,
	354	iname[iindex].indexname,
	355	iname[iindex].indexlen);
	356	oid_len = namelen + onamelen + iname[iindex].indexlen;
d62a17ae	357	} else {
	358	/* Scalar object */
	359	onamelen = trapobj[i].namelen * (-1);
	360	oid_copy(oid, name, namelen);
	361	oid_copy(oid + namelen, trapobj[i].name, onamelen);
	362	oid[onamelen + namelen] = 0;
	363	oid_len = namelen + onamelen + 1;
	364	}
	365
	366	/* Locate the appropriate function and type in the MIB registry.
	367	*/
	368	for (j = 0; j < vp_len; j++) {
	369	if (oid_compare(trapobj[i].name, onamelen, vp[j].name,
	370	vp[j].namelen)
	371	!= 0)
	372	continue;
	373	/* We found the appropriate variable in the MIB
	374	* registry. */
	375	oid_copy(cvp.name, name, namelen);
	376	oid_copy(cvp.name + namelen, vp[j].name, vp[j].namelen);
	377	cvp.namelen = namelen + vp[j].namelen;
	378	cvp.type = vp[j].type;
	379	cvp.magic = vp[j].magic;
	380	cvp.acl = vp[j].acl;
	381	cvp.findVar = vp[j].findVar;
4eb8c74f	382
d62a17ae	383	/* Grab the result. */
	384	val = cvp.findVar(&cvp, oid, &oid_len, 1, &val_len,
	385	&wm);
	386	if (!val)
	387	break;
	388	snmp_varlist_add_variable(&notification_vars, oid,
	389	oid_len, vp[j].type, val,
	390	val_len);
	391	break;
	392	}
b7c0d065	393	}
b7c0d065 VB	394
b7c0d065 VB	395
d62a17ae	396	send_v2trap(notification_vars);
	397	snmp_free_varbind(notification_vars);
	398	agentx_events_update();
	399	return 1;
d6be5fb9 VB	400	}
d6be5fb9 VB	401
1ee746d9	402	void smux_events_update(void)
	403	{
	404	agentx_events_update();
	405	}
	406
5986b66b	407	#endif /* SNMP_AGENTX */