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/* $OpenBSD: application_legacy.c,v 1.1 2022/01/19 10:59:35 martijn Exp $ */
/*
* Copyright (c) 2021 Martijn van Duren <martijn@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 <event.h>
#include <stdlib.h>
#include "application.h"
#include "snmpd.h"
struct appl_varbind *appl_legacy_response(size_t);
void appl_legacy_get(struct appl_backend *, int32_t, int32_t, const char *,
struct appl_varbind *);
void appl_legacy_getnext(struct appl_backend *, int32_t, int32_t, const char *,
struct appl_varbind *);
struct appl_backend_functions appl_legacy_functions = {
.ab_get = appl_legacy_get,
.ab_getnext = appl_legacy_getnext,
.ab_getbulk = NULL, /* Legacy getbulk implementation is broken */
};
struct appl_backend appl_legacy = {
.ab_name = "legacy backend",
.ab_cookie = NULL,
.ab_retries = 0,
.ab_fn = &appl_legacy_functions
};
static struct ber_element *root;
static struct appl_varbind *response = NULL;
static size_t responsesz = 0;
void
appl_legacy_init(void)
{
struct oid *object = NULL;
struct ber_oid oid;
while ((object = smi_foreach(object, OID_RD)) != NULL) {
oid = object->o_id;
if (!(object->o_flags & OID_TABLE))
oid.bo_id[oid.bo_n++] = 0;
appl_register(NULL, 150, 1, &oid,
!(object->o_flags & OID_TABLE), 1, 0, 0, &appl_legacy);
}
if ((root = ober_add_sequence(NULL)) == NULL)
fatal("%s: Failed to init root", __func__);
}
void
appl_legacy_shutdown(void)
{
appl_close(&appl_legacy);
ober_free_elements(root);
free(response);
}
struct appl_varbind *
appl_legacy_response(size_t nvarbind)
{
struct appl_varbind *tmp;
size_t i;
if (responsesz < nvarbind) {
if ((tmp = recallocarray(response, responsesz, nvarbind,
sizeof(*response))) == NULL) {
log_warn(NULL);
return NULL;
}
responsesz = nvarbind;
response = tmp;
}
for (i = 0; i < nvarbind; i++)
response[i].av_next = i + 1 == nvarbind ?
NULL : &(response[i + 1]);
return response;
}
void
appl_legacy_get(struct appl_backend *backend, __unused int32_t transactionid,
int32_t requestid, __unused const char *ctx, struct appl_varbind *vblist)
{
size_t i;
struct ber_element *elm;
struct appl_varbind *vb, *rvb, *rvblist;
for (i = 0, vb = vblist; vb != NULL; vb = vb->av_next)
i++;
if ((rvblist = appl_legacy_response(i)) == NULL) {
appl_response(backend, requestid, APPL_ERROR_GENERR, 1, vb);
return;
}
rvb = rvblist;
for (vb = vblist; vb != NULL; vb = vb->av_next, rvb = rvb->av_next) {
(void)mps_getreq(NULL, root, &(vb->av_oid), 1);
elm = ober_unlink_elements(root);
ober_get_oid(elm, &(rvb->av_oid));
rvb->av_value = ober_unlink_elements(elm);
ober_free_elements(elm);
}
appl_response(backend, requestid, APPL_ERROR_NOERROR, 0, rvblist);
}
void
appl_legacy_getnext(struct appl_backend *backend,
__unused int32_t transactionid, int32_t requestid, __unused const char *ctx,
struct appl_varbind *vblist)
{
size_t i;
struct ber_element *elm;
struct appl_varbind *vb, *rvb, *rvblist;
struct snmp_message msg;
int ret;
for (i = 0, vb = vblist; vb != NULL; vb = vb->av_next)
i++;
if ((rvblist = appl_legacy_response(i)) == NULL) {
appl_response(backend, requestid, APPL_ERROR_GENERR, 1, vb);
return;
}
rvb = rvblist;
i = 1;
for (vb = vblist; vb != NULL; vb = vb->av_next, rvb = rvb->av_next) {
ret = -1;
if (vb->av_include) {
ret = mps_getreq(NULL, root, &(vb->av_oid), 0);
if (ret == -1)
ober_free_elements(ober_unlink_elements(root));
}
rvb->av_oid = vb->av_oid;
if (ret == -1) {
msg.sm_version = 1;
(void)mps_getnextreq(&msg, root, &(rvb->av_oid));
}
elm = ober_unlink_elements(root);
ober_get_oid(elm, &(rvb->av_oid));
if (ober_oid_cmp(&(rvb->av_oid), &(vb->av_oid_end)) > 0) {
rvb->av_oid = vb->av_oid;
rvb->av_value = appl_exception(APPL_EXC_ENDOFMIBVIEW);
if (rvb->av_value == NULL) {
log_warn("Failed to create endOfMibView");
rvb->av_next = NULL;
appl_response(backend, requestid,
APPL_ERROR_GENERR, i, rvblist);
return;
}
} else
rvb->av_value = ober_unlink_elements(elm);
ober_free_elements(elm);
i++;
}
appl_response(backend, requestid, APPL_ERROR_NOERROR, 0, rvblist);
}
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