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/* $OpenBSD: trap.c,v 1.43 2024/02/06 15:36:11 martijn Exp $ */
/*
* Copyright (c) 2008 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/socket.h>
#include <ber.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "log.h"
#include "mib.h"
#include "smi.h"
#include "snmp.h"
#include "snmpd.h"
void
trap_init(void)
{
/*
* Send a coldStart to notify that the daemon has been
* started and re-initialized.
*/
trap_send(&OID(MIB_coldStart), NULL);
}
int
trap_send(struct ber_oid *oid, struct ber_element *elm)
{
struct trap_address *tr;
struct ber_element *vblist, *trap;
struct ber_oid uptime = OID(MIB_sysUpTime, 0);
struct ber_oid trapoid = OID(MIB_snmpTrapOID, 0);
char ostr[SNMP_MAX_OID_STRLEN];
struct snmp_message *msg;
int r;
if (TAILQ_EMPTY(&snmpd_env->sc_trapreceivers))
return (0);
mib_oid2string(oid, ostr, sizeof(ostr), snmpd_env->sc_oidfmt);
log_debug("trap_send: oid %s", ostr);
/* Add mandatory varbind elements */
trap = ober_add_sequence(NULL);
vblist = ober_printf_elements(trap, "{Odt}{OO}",
&uptime, smi_getticks(),
BER_CLASS_APPLICATION, SNMP_T_TIMETICKS,
&trapoid, oid);
if (elm != NULL)
ober_link_elements(vblist, elm);
TAILQ_FOREACH(tr, &snmpd_env->sc_trapreceivers, entry) {
if (tr->ta_oid.bo_n) {
/* The trap receiver may want only a specified MIB */
r = ober_oid_cmp(oid, &tr->ta_oid);
if (r != 0 && r != 2)
continue;
}
if ((msg = calloc(1, sizeof(*msg))) == NULL)
fatal("malloc");
msg->sm_sock = snmpd_socket_af(&tr->ta_ss, SOCK_DGRAM);
if (msg->sm_sock == -1) {
log_warn("socket");
free(msg);
continue;
}
memcpy(&(msg->sm_ss), &(tr->ta_ss), sizeof(msg->sm_ss));
msg->sm_slen = tr->ta_ss.ss_len;
if (tr->ta_sslocal.ss_family != 0) {
memcpy(&(msg->sm_local_ss), &(tr->ta_sslocal),
sizeof(msg->sm_local_ss));
msg->sm_local_slen = tr->ta_sslocal.ss_len;
}
msg->sm_version = tr->ta_version;
msg->sm_pdutype = SNMP_C_TRAPV2;
ober_set_application(&msg->sm_ber, smi_application);
msg->sm_request = arc4random();
if ((msg->sm_varbindresp = ober_dup(trap->be_sub)) == NULL)
fatal("malloc");
switch (msg->sm_version) {
case SNMP_V2:
(void)strlcpy(msg->sm_community, tr->ta_community,
sizeof(msg->sm_community));
break;
case SNMP_V3:
msg->sm_msgid = msg->sm_request & INT32_MAX;
msg->sm_max_msg_size = READ_BUF_SIZE;
msg->sm_flags = tr->ta_seclevel != -1 ?
tr->ta_seclevel : snmpd_env->sc_min_seclevel;
msg->sm_secmodel = SNMP_SEC_USM;
msg->sm_engine_time = snmpd_engine_time();
msg->sm_engine_boots = snmpd_env->sc_engine_boots;
memcpy(msg->sm_ctxengineid, snmpd_env->sc_engineid,
snmpd_env->sc_engineid_len);
msg->sm_ctxengineid_len =
snmpd_env->sc_engineid_len;
(void)strlcpy(msg->sm_username, tr->ta_usmusername,
sizeof(msg->sm_username));
msg->sm_user = tr->ta_usmuser;
arc4random_buf(msg->sm_salt, sizeof(msg->sm_salt));
break;
}
snmpe_response(msg);
}
ober_free_elements(trap);
return 0;
}
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