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/* $OpenBSD: util.c,v 1.5 2015/11/21 13:06:22 reyk Exp $ */
/*
* Copyright (c) 2014 Bret Stephen Lambert <blambert@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/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <event.h>
#include "ber.h"
#include "snmp.h"
#include "snmpd.h"
/* log.c */
extern int debug;
extern int verbose;
/*
* Convert variable bindings from AgentX to SNMP dialect.
*/
int
varbind_convert(struct agentx_pdu *pdu, struct agentx_varbind_hdr *vbhdr,
struct ber_element **varbind, struct ber_element **iter)
{
struct ber_oid oid;
u_int32_t d;
u_int64_t l;
int slen;
char *str;
struct ber_element *a;
int ret = AGENTX_ERR_NONE;
if (snmp_agentx_read_oid(pdu, (struct snmp_oid *)&oid) == -1) {
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
*iter = ber_add_sequence(*iter);
if (*varbind == NULL)
*varbind = *iter;
a = ber_add_oid(*iter, &oid);
switch (vbhdr->type) {
case AGENTX_NO_SUCH_OBJECT:
case AGENTX_NO_SUCH_INSTANCE:
case AGENTX_END_OF_MIB_VIEW:
case AGENTX_NULL:
a = ber_add_null(a);
break;
case AGENTX_IP_ADDRESS:
case AGENTX_OPAQUE:
case AGENTX_OCTET_STRING:
str = snmp_agentx_read_octetstr(pdu, &slen);
if (str == NULL) {
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
a = ber_add_nstring(a, str, slen);
break;
case AGENTX_OBJECT_IDENTIFIER:
if (snmp_agentx_read_oid(pdu,
(struct snmp_oid *)&oid) == -1) {
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
a = ber_add_oid(a, &oid);
break;
case AGENTX_INTEGER:
case AGENTX_COUNTER32:
case AGENTX_GAUGE32:
case AGENTX_TIME_TICKS:
if (snmp_agentx_read_int(pdu, &d) == -1) {
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
a = ber_add_integer(a, d);
break;
case AGENTX_COUNTER64:
if (snmp_agentx_read_int64(pdu, &l) == -1) {
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
a = ber_add_integer(a, l);
break;
default:
log_debug("unknown data type '%i'", vbhdr->type);
ret = AGENTX_ERR_PARSE_ERROR;
goto done;
}
/* AgentX types correspond to BER types */
switch (vbhdr->type) {
case BER_TYPE_INTEGER:
case BER_TYPE_BITSTRING:
case BER_TYPE_OCTETSTRING:
case BER_TYPE_NULL:
case BER_TYPE_OBJECT:
/* universal types */
break;
/* Convert AgentX error types to SNMP error types */
case AGENTX_NO_SUCH_OBJECT:
ber_set_header(a, BER_CLASS_CONTEXT, 0);
break;
case AGENTX_NO_SUCH_INSTANCE:
ber_set_header(a, BER_CLASS_CONTEXT, 1);
break;
case AGENTX_COUNTER32:
ber_set_header(a, BER_CLASS_APPLICATION, SNMP_COUNTER32);
break;
case AGENTX_GAUGE32:
ber_set_header(a, BER_CLASS_APPLICATION, SNMP_GAUGE32);
break;
case AGENTX_COUNTER64:
ber_set_header(a, BER_CLASS_APPLICATION, SNMP_COUNTER64);
break;
case AGENTX_IP_ADDRESS:
/* application 0 implicit 4-byte octet string per SNMPv2-SMI */
break;
default:
/* application-specific types */
ber_set_header(a, BER_CLASS_APPLICATION, vbhdr->type);
break;
}
done:
return (ret);
}
void
print_debug(const char *emsg, ...)
{
va_list ap;
if (debug && verbose > 2) {
va_start(ap, emsg);
vfprintf(stderr, emsg, ap);
va_end(ap);
}
}
void
print_verbose(const char *emsg, ...)
{
va_list ap;
if (verbose) {
va_start(ap, emsg);
vfprintf(stderr, emsg, ap);
va_end(ap);
}
}
const char *
log_in6addr(const struct in6_addr *addr)
{
static char buf[NI_MAXHOST];
struct sockaddr_in6 sa_in6;
u_int16_t tmp16;
bzero(&sa_in6, sizeof(sa_in6));
sa_in6.sin6_len = sizeof(sa_in6);
sa_in6.sin6_family = AF_INET6;
memcpy(&sa_in6.sin6_addr, addr, sizeof(sa_in6.sin6_addr));
/* XXX thanks, KAME, for this ugliness... adopted from route/show.c */
if (IN6_IS_ADDR_LINKLOCAL(&sa_in6.sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&sa_in6.sin6_addr)) {
memcpy(&tmp16, &sa_in6.sin6_addr.s6_addr[2], sizeof(tmp16));
sa_in6.sin6_scope_id = ntohs(tmp16);
sa_in6.sin6_addr.s6_addr[2] = 0;
sa_in6.sin6_addr.s6_addr[3] = 0;
}
return (print_host((struct sockaddr_storage *)&sa_in6, buf,
NI_MAXHOST));
}
const char *
print_host(struct sockaddr_storage *ss, char *buf, size_t len)
{
if (getnameinfo((struct sockaddr *)ss, ss->ss_len,
buf, len, NULL, 0, NI_NUMERICHOST) != 0) {
buf[0] = '\0';
return (NULL);
}
return (buf);
}
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