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SNMP: improve AgentX registration tracking

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This commit is contained in:
Vojtech Vilimek 2024-08-13 17:53:45 +02:00
parent 9684fda9bf
commit 1849d28e49
5 changed files with 30 additions and 70 deletions
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50
proto/snmp/bgp4_mib.c
View File

@ -59,24 +59,12 @@ snmp_bgp_last_error(const struct bgp_proto *bgp, char err[2])
err[1] = bgp->last_error_code & 0x000000FF;
}
static void
snmp_bgp_reg_ok(struct snmp_proto *p, const struct agentx_response *res, struct snmp_registration *reg)
{
/* TODO(contexts): add meaningful action */
const struct oid * const oid = reg->oid;
(void)oid;
(void)p;
(void) res;
}
static void
snmp_bgp_reg_failed(struct snmp_proto *p, const struct agentx_response *res, struct snmp_registration *reg)
{
/* TODO(contexts): add meaningful action */
const struct oid * const oid = reg->oid;
(void) res;
(void)oid;
(void)p;
(void) reg;
snmp_reset(p);
}
/*
@ -236,31 +224,21 @@ snmp_bgp_notify_backward_trans(struct snmp_proto *p, struct bgp_proto *bgp)
void
snmp_bgp4_register(struct snmp_proto *p)
{
u32 bgp_mib_prefix[] = { SNMP_MIB_2, SNMP_BGP4_MIB };
/* Register the whole BGP4-MIB::bgp root tree node */
struct snmp_registration *reg;
reg = snmp_registration_create(p, BGP4_MIB_ID);
{
/* Register the whole BGP4-MIB::bgp root tree node */
struct snmp_registration *reg;
reg = snmp_registration_create(p, BGP4_MIB_ID);
struct oid *oid = mb_allocz(p->pool, sizeof(bgp4_mib_oid));
memcpy(oid, &bgp4_mib_oid, sizeof(bgp4_mib_oid));
struct oid *oid = mb_allocz(p->pool,
snmp_oid_size_from_len(ARRAY_SIZE(bgp_mib_prefix)));
print(;
STORE_U8(oid->n_subid, ARRAY_SIZE(bgp_mib_prefix));
STORE_U8(oid->prefix, SNMP_MGMT);
reg->reg_hook_ok = NULL;
reg->reg_hook_fail = snmp_bgp_reg_failed;
// TODO use STATIC_OID
memcpy(oid->ids, bgp_mib_prefix, sizeof(bgp_mib_prefix));
reg->oid = oid;
reg->reg_hook_ok = snmp_bgp_reg_ok;
reg->reg_hook_fail = snmp_bgp_reg_failed;
/*
* We set both upper bound and index to zero, therefore only single OID
* is being registered.
*/
snmp_register(p, oid, 0, 0, SNMP_REGISTER_TREE);
}
/*
* We set both upper bound and index to zero, therefore only single OID
* is being registered.
*/
snmp_register(p, oid, 0, 0, SNMP_REGISTER_TREE);
}
static int

2
proto/snmp/snmp.h
View File

@ -121,7 +121,6 @@ struct snmp_proto {
u32 transaction_id;
u32 packet_id;
uint registrations_to_ack; /* counter of pending responses to register-pdu */
list registration_queue; /* list containing snmp_register records */
// map
@ -158,7 +157,6 @@ struct snmp_registration {
u32 session_id;
u32 transaction_id;
u32 packet_id;
struct oid *oid;
snmp_reg_hook_t reg_hook_ok; /* hook called when successful response to OID registration is recieved */
snmp_reg_hook_t reg_hook_fail; /* hook called when OID registration fail */
};

10
proto/snmp/snmp_utils.c
View File

@ -665,13 +665,11 @@ snmp_registration_create(struct snmp_proto *p, enum agentx_mibs mib)
}
int
snmp_registration_match(struct snmp_registration *r, struct agentx_header *h, enum agentx_mibs mib)
snmp_registration_match(struct snmp_registration *r, struct agentx_header *h)
{
return
(r->mib == mib) &&
(r->session_id == h->session_id) &&
(r->transaction_id == h->transaction_id) &&
(r->packet_id == h->packet_id);
return (LOAD_U32(r->session_id) == h->session_id) &&
(LOAD_U32(r->transaction_id) == h->transaction_id) &&
(LOAD_U32(r->packet_id) == h->packet_id);
}

2
proto/snmp/snmp_utils.h
View File

@ -96,7 +96,7 @@ byte *snmp_put_fbyte(byte *buf, u8 data);
*
*/
struct snmp_registration *snmp_registration_create(struct snmp_proto *p, enum agentx_mibs mib);
int snmp_registration_match(struct snmp_registration *r, struct agentx_header *h, enum agentx_mibs mib);
int snmp_registration_match(struct snmp_registration *r, struct agentx_header *h);
void snmp_dump_packet(byte *pkt, uint size);
void snmp_oid_dump(const struct oid *oid);

36
proto/snmp/subagent.c
View File

@ -80,28 +80,27 @@ snmp_blank_header(struct agentx_header *h, enum agentx_pdu_types type)
* @oid: MIB subtree Object Identifier in cpu native byte order
*/
void
snmp_register_ack(struct snmp_proto *p, struct agentx_response *res, const struct oid *oid)
snmp_register_ack(struct snmp_proto *p, struct agentx_response *res)
{
enum agentx_mibs mib = agentx_get_mib(oid);
struct snmp_registration *reg;
WALK_LIST(reg, p->registration_queue)
{
if (snmp_registration_match(reg, &res->h, mib))
if (snmp_registration_match(reg, &res->h))
{
rem_node(&reg->n);
p->registrations_to_ack--;
if (res->error == AGENTX_RES_NO_ERROR)
if (res->error == AGENTX_RES_NO_ERROR && reg->reg_hook_ok)
reg->reg_hook_ok(p, res, reg);
else
else if (res->error != AGENTX_RES_NO_ERROR && reg->reg_hook_fail)
reg->reg_hook_fail(p, res, reg);
mb_free(reg->oid);
mb_free(reg);
return;
break;
}
}
if (EMPTY_LIST(p->registration_queue))
snmp_up(p);
}
/*
@ -784,12 +783,7 @@ parse_response(struct snmp_proto *p, byte *res)
case AGENTX_RES_UNKNOWN_REGISTER:
// TODO more direct path to mib-specific code
TRACE(D_PACKETS, "SNMP received agentx-Response-PDU with error %u", r->error);
byte *pkt = res + sizeof(struct agentx_response);
const struct oid *failed_buf = (struct oid *) pkt;
uint failed_size = snmp_oid_size(failed_buf);
struct oid *failed = tmp_alloc(failed_size);
snmp_oid_from_buf(failed, failed_buf);
snmp_register_ack(p, r, failed);
snmp_register_ack(p, r);
break;
/*
@ -820,6 +814,7 @@ void
snmp_register_mibs(struct snmp_proto *p)
{
snmp_bgp4_register(p);
ASSUME(!EMPTY_LIST(p->registration_queue));
}
/*
@ -856,16 +851,7 @@ do_response(struct snmp_proto *p, byte *pkt)
break;
case SNMP_REGISTER:;
pkt += AGENTX_HEADER_SIZE;
const struct oid *oid_buf = (struct oid *) pkt;
uint oid_size = snmp_oid_size(oid_buf);
struct oid *oid = tmp_alloc(oid_size);
snmp_oid_from_buf(oid, oid_buf);
snmp_register_ack(p, r, oid);
if (p->registrations_to_ack == 0)
snmp_set_state(p, SNMP_CONN);
snmp_register_ack(p, r);
break;
case SNMP_CONN: