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/* $OpenBSD: trap.c,v 1.29 2017/04/21 13:46:15 jca 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/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/tree.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include "snmpd.h"
#include "mib.h"
void
trap_init(void)
{
struct ber_oid trapoid = OID(MIB_coldStart);
/*
* Send a coldStart to notify that the daemon has been
* started and re-initialized.
*/
trap_send(&trapoid, NULL);
}
int
trap_agentx(struct agentx_handle *h, struct agentx_pdu *pdu, int *idx,
char **varcpy, int *vcpylen)
{
struct agentx_varbind_hdr vbhdr;
u_int32_t d;
struct ber_oid o, oid;
struct ber_oid uptime = OID(MIB_sysUpTime);
struct ber_oid trapoid = OID(MIB_snmpTrapOID);
struct ber_element *varbind, *iter;
int x = 0, state = 0;
int ret = AGENTX_ERR_NONE;
int seensysuptime, seentrapoid;
size_t len = 0;
pid_t pid = -1;
char *v = NULL;
*varcpy = NULL;
varbind = NULL;
iter = NULL;
seensysuptime = seentrapoid = 0;
if (pdu->hdr->flags & AGENTX_NON_DEFAULT_CONTEXT) {
ret = AGENTX_ERR_UNSUPPORTED_CONTEXT;
goto done;
}
if ((v = malloc(pdu->hdr->length)) == NULL ||
snmp_agentx_copy_raw(pdu, v, pdu->hdr->length) == -1) {
ret = AGENTX_ERR_PROCESSING_ERROR;
goto done;
}
while (pdu->datalen > sizeof(struct agentx_hdr)) {
x++;
if (snmp_agentx_read_vbhdr(pdu, &vbhdr) == -1) {
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
if (state < 2) {
if (snmp_agentx_read_oid(pdu, (struct snmp_oid *)&oid) == -1) {
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
if (state == 0 && ber_oid_cmp(&oid, &uptime) == 0) {
if (snmp_agentx_read_int(pdu, &d) == -1) {
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
state = 1;
continue;
} else if (ber_oid_cmp(&oid, &trapoid) == 0) {
if (snmp_agentx_read_oid(pdu,
(struct snmp_oid *)&o) == -1) {
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
state = 2;
continue;
} else {
ret = AGENTX_ERR_PROCESSING_ERROR;
goto done;
}
}
ret = varbind_convert(pdu, &vbhdr, &varbind, &iter);
if (ret != AGENTX_ERR_NONE)
goto done;
}
if (varbind != NULL)
len = ber_calc_len(varbind);
log_debug("trap_agentx: from pid %u len %zd elements %d",
pid, len, x);
trap_send(&o, varbind);
*varcpy = v;
*vcpylen = pdu->hdr->length;
return (AGENTX_ERR_NONE);
done:
if (varbind != NULL)
ber_free_elements(varbind);
free(v);
*idx = x;
return (ret);
}
int
trap_send(struct ber_oid *oid, struct ber_element *elm)
{
int ret = 0, s;
struct address *tr;
struct ber_element *root, *b, *c, *trap;
struct ber ber;
char *cmn;
ssize_t len;
u_int8_t *ptr;
struct ber_oid uptime = OID(MIB_sysUpTime);
struct ber_oid trapoid = OID(MIB_snmpTrapOID);
char ostr[SNMP_MAX_OID_STRLEN];
struct oid oa, ob;
if (TAILQ_EMPTY(&snmpd_env->sc_trapreceivers))
return (0);
smi_scalar_oidlen(&uptime);
smi_scalar_oidlen(&trapoid);
smi_scalar_oidlen(oid);
smi_oid2string(oid, ostr, sizeof(ostr), 0);
log_debug("trap_send: oid %s", ostr);
/* Setup OIDs to compare against the trap receiver MIB */
bzero(&oa, sizeof(oa));
bcopy(oid->bo_id, &oa.o_oid, sizeof(oa.o_oid));
oa.o_oidlen = oid->bo_n;
bzero(&ob, sizeof(ob));
ob.o_flags = OID_TABLE;
/* Add mandatory varbind elements */
trap = ber_add_sequence(NULL);
c = ber_printf_elements(trap, "{Odt}{OO}",
&uptime, smi_getticks(),
BER_CLASS_APPLICATION, SNMP_T_TIMETICKS,
&trapoid, oid);
if (elm != NULL)
ber_link_elements(c, elm);
bzero(&ber, sizeof(ber));
ber.fd = -1;
TAILQ_FOREACH(tr, &snmpd_env->sc_trapreceivers, entry) {
if (tr->sa_oid != NULL && tr->sa_oid->bo_n) {
/* The trap receiver may want only a specified MIB */
bcopy(&tr->sa_oid->bo_id, &ob.o_oid,
sizeof(ob.o_oid));
ob.o_oidlen = tr->sa_oid->bo_n;
if (smi_oid_cmp(&oa, &ob) != 0)
continue;
}
if ((s = snmpd_socket_af(&tr->ss, htons(tr->port))) == -1) {
ret = -1;
goto done;
}
if (tr->sa_srcaddr != NULL) {
if (bind(s, (struct sockaddr *)&tr->sa_srcaddr->ss,
tr->sa_srcaddr->ss.ss_len) == -1) {
ret = -1;
goto done;
}
}
cmn = tr->sa_community != NULL ?
tr->sa_community : snmpd_env->sc_trcommunity;
/* SNMP header */
root = ber_add_sequence(NULL);
b = ber_printf_elements(root, "ds{tddd",
SNMP_V2, cmn, BER_CLASS_CONTEXT, SNMP_C_TRAPV2,
arc4random(), 0, 0);
ber_link_elements(b, trap);
#ifdef DEBUG
smi_debug_elements(root);
#endif
len = ber_write_elements(&ber, root);
if (ber_get_writebuf(&ber, (void *)&ptr) > 0 &&
sendto(s, ptr, len, 0, (struct sockaddr *)&tr->ss,
tr->ss.ss_len) != -1) {
snmpd_env->sc_stats.snmp_outpkts++;
ret++;
}
close(s);
ber_unlink_elements(b);
ber_free_elements(root);
}
done:
ber_free_elements(trap);
ber_free(&ber);
return (ret);
}
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