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/* $OpenBSD: snmp.c,v 1.13 2013/01/17 20:34:18 bluhm 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/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <err.h>
#include <event.h>
#include <openssl/ssl.h>
#include "relayd.h"
#include "snmp.h"
#define RELAYD_MIB "1.3.6.1.4.1.30155.3"
#define SNMP_ELEMENT(x...) do { \
if (snmp_element(RELAYD_MIB x) == -1) \
goto done; \
} while (0)
static struct imsgev *iev_snmp = NULL;
enum privsep_procid snmp_procid;
void snmp_sock(int, short, void *);
int snmp_element(const char *, enum snmp_type, void *, int64_t);
void
snmp_init(struct relayd *env, enum privsep_procid id)
{
if (event_initialized(&env->sc_snmpev))
event_del(&env->sc_snmpev);
if (event_initialized(&env->sc_snmpto))
event_del(&env->sc_snmpto);
if (env->sc_snmp != -1) {
close(env->sc_snmp);
env->sc_snmp = -1;
}
if ((env->sc_flags & F_TRAP) == 0)
return;
snmp_procid = id;
snmp_sock(-1, -1, env);
}
int
snmp_setsock(struct relayd *env, enum privsep_procid id)
{
struct imsgev tmpiev;
struct sockaddr_un sun;
int s = -1;
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
goto done;
bzero(&sun, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, SNMP_SOCKET, sizeof(sun.sun_path));
if (connect(s, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
close(s);
s = -1;
goto done;
}
/* enable restricted snmp socket mode */
bzero(&tmpiev, sizeof(tmpiev));
imsg_init(&tmpiev.ibuf, s);
imsg_compose_event(&tmpiev, IMSG_SNMP_LOCK, 0, 0, -1, NULL, 0);
done:
proc_compose_imsg(env->sc_ps, id, -1, IMSG_SNMPSOCK, s, NULL, 0);
return (-1);
}
int
snmp_getsock(struct relayd *env, struct imsg *imsg)
{
struct timeval tv = SNMP_RECONNECT_TIMEOUT;
if (imsg->fd == -1)
goto retry;
env->sc_snmp = imsg->fd;
log_debug("%s: got new snmp socket %d", __func__, imsg->fd);
if (iev_snmp == NULL &&
(iev_snmp = calloc(1, sizeof(*iev_snmp))) == NULL)
fatal("snmp_getsock: calloc");
imsg_init(&iev_snmp->ibuf, env->sc_snmp);
event_set(&env->sc_snmpev, env->sc_snmp,
EV_READ|EV_TIMEOUT, snmp_sock, env);
event_add(&env->sc_snmpev, NULL);
return (0);
retry:
evtimer_set(&env->sc_snmpto, snmp_sock, env);
evtimer_add(&env->sc_snmpto, &tv);
return (0);
}
void
snmp_sock(int fd, short event, void *arg)
{
struct relayd *env = arg;
struct timeval tv = SNMP_RECONNECT_TIMEOUT;
switch (event) {
case -1:
bzero(&tv, sizeof(tv));
goto retry;
case EV_READ:
log_debug("%s: snmp socket closed %d", __func__, env->sc_snmp);
(void)close(env->sc_snmp);
break;
}
proc_compose_imsg(env->sc_ps, snmp_procid, -1,
IMSG_SNMPSOCK, -1, NULL, 0);
return;
retry:
evtimer_set(&env->sc_snmpto, snmp_sock, arg);
evtimer_add(&env->sc_snmpto, &tv);
}
int
snmp_element(const char *oid, enum snmp_type type, void *buf, int64_t val)
{
struct iovec iov[2];
int iovcnt = 2;
u_int32_t d;
u_int64_t l;
struct snmp_imsg sm;
DPRINTF("%s: oid %s type %d buf %p val %lld", __func__,
oid, type, buf, val);
bzero(&iov, sizeof(iov));
switch (type) {
case SNMP_COUNTER32:
case SNMP_GAUGE32:
case SNMP_TIMETICKS:
case SNMP_OPAQUE:
case SNMP_UINTEGER32:
case SNMP_INTEGER32:
d = (u_int32_t)val;
iov[1].iov_base = &d;
iov[1].iov_len = sizeof(d);
break;
case SNMP_COUNTER64:
l = (u_int64_t)val;
iov[1].iov_base = &l;
iov[1].iov_len = sizeof(l);
break;
case SNMP_NSAPADDR:
case SNMP_BITSTRING:
case SNMP_OCTETSTRING:
case SNMP_IPADDR:
case SNMP_OBJECT:
iov[1].iov_base = buf;
if (val == 0)
iov[1].iov_len = strlen((char *)buf);
else
iov[1].iov_len = val;
break;
case SNMP_NULL:
iovcnt--;
break;
}
bzero(&sm, sizeof(sm));
if (strlcpy(sm.snmp_oid, oid, sizeof(sm.snmp_oid)) >=
sizeof(sm.snmp_oid))
return (-1);
sm.snmp_type = type;
sm.snmp_len = iov[1].iov_len;
iov[0].iov_base = &sm;
iov[0].iov_len = sizeof(sm);
if (imsg_composev(&iev_snmp->ibuf, IMSG_SNMP_ELEMENT, 0, 0, -1,
iov, iovcnt) == -1)
return (-1);
imsg_event_add(iev_snmp);
return (0);
}
/*
* SNMP traps for relayd
*/
void
snmp_hosttrap(struct relayd *env, struct table *table, struct host *host)
{
if (iev_snmp == NULL || env->sc_snmp == -1)
return;
/*
* OPENBSD-RELAYD-MIB host status trap
* XXX The trap format needs some tweaks and other OIDs
*/
imsg_compose_event(iev_snmp, IMSG_SNMP_TRAP, 0, 0, -1, NULL, 0);
SNMP_ELEMENT(".1.0", SNMP_NULL, NULL, 0);
SNMP_ELEMENT(".1.1.0", SNMP_OCTETSTRING, host->conf.name, 0);
SNMP_ELEMENT(".1.2.0", SNMP_INTEGER32, NULL, host->up);
SNMP_ELEMENT(".1.3.0", SNMP_INTEGER32, NULL, host->last_up);
SNMP_ELEMENT(".1.4.0", SNMP_INTEGER32, NULL, host->up_cnt);
SNMP_ELEMENT(".1.5.0", SNMP_INTEGER32, NULL, host->check_cnt);
SNMP_ELEMENT(".1.6.0", SNMP_OCTETSTRING, table->conf.name, 0);
SNMP_ELEMENT(".1.7.0", SNMP_INTEGER32, NULL, table->up);
if (!host->conf.retry)
goto done;
SNMP_ELEMENT(".1.8.0", SNMP_INTEGER32, NULL, host->conf.retry);
SNMP_ELEMENT(".1.9.0", SNMP_INTEGER32, NULL, host->retry_cnt);
done:
imsg_compose_event(iev_snmp, IMSG_SNMP_END, 0, 0, -1, NULL, 0);
}
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