static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
{
struct snmp_pdu *req;
struct snmp_pdu *res;
struct variable_list *vb;
const data_set_t *ds;
oid_t *oid_list;
uint32_t oid_list_len;
int status;
int i;
/* `value_table' and `value_table_ptr' implement a linked list for each
* value. `instance_list' and `instance_list_ptr' implement a linked list of
* instance names. This is used to jump gaps in the table. */
csnmp_list_instances_t *instance_list;
csnmp_list_instances_t *instance_list_ptr;
csnmp_table_values_t **value_table;
csnmp_table_values_t **value_table_ptr;
DEBUG ("snmp plugin: csnmp_read_table (host = %s, data = %s)",
host->name, data->name);
if (host->sess_handle == NULL)
{
DEBUG ("snmp plugin: csnmp_read_table: host->sess_handle == NULL");
return (-1);
}
ds = plugin_get_ds (data->type);
if (!ds)
{
ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
return (-1);
}
if (ds->ds_num != data->values_len)
{
ERROR ("snmp plugin: DataSet `%s' requires %i values, but config talks about %i",
data->type, ds->ds_num, data->values_len);
return (-1);
}
/* We need a copy of all the OIDs, because GETNEXT will destroy them. */
oid_list_len = data->values_len + 1;
oid_list = (oid_t *) malloc (sizeof (oid_t) * (oid_list_len));
if (oid_list == NULL)
{
ERROR ("snmp plugin: csnmp_read_table: malloc failed.");
return (-1);
}
memcpy (oid_list, data->values, data->values_len * sizeof (oid_t));
if (data->instance.oid.oid_len > 0)
memcpy (oid_list + data->values_len, &data->instance.oid, sizeof (oid_t));
else
oid_list_len--;
/* Allocate the `value_table' */
value_table = (csnmp_table_values_t **) malloc (sizeof (csnmp_table_values_t *)
* 2 * data->values_len);
if (value_table == NULL)
{
ERROR ("snmp plugin: csnmp_read_table: malloc failed.");
sfree (oid_list);
return (-1);
}
memset (value_table, '\0', sizeof (csnmp_table_values_t *) * 2 * data->values_len);
value_table_ptr = value_table + data->values_len;
instance_list = NULL;
instance_list_ptr = NULL;
status = 0;
while (status == 0)
{
req = snmp_pdu_create (SNMP_MSG_GETNEXT);
if (req == NULL)
{
ERROR ("snmp plugin: snmp_pdu_create failed.");
status = -1;
break;
}
for (i = 0; (uint32_t) i < oid_list_len; i++)
snmp_add_null_var (req, oid_list[i].oid, oid_list[i].oid_len);
res = NULL;
status = snmp_sess_synch_response (host->sess_handle, req, &res);
if ((status != STAT_SUCCESS) || (res == NULL))
{
char *errstr = NULL;
snmp_sess_error (host->sess_handle, NULL, NULL, &errstr);
c_complain (LOG_ERR, &host->complaint,
"snmp plugin: host %s: snmp_sess_synch_response failed: %s",
host->name, (errstr == NULL) ? "Unknown problem" : errstr);
if (res != NULL)
snmp_free_pdu (res);
res = NULL;
sfree (errstr);
csnmp_host_close_session (host);
status = -1;
break;
}
status = 0;
assert (res != NULL);
c_release (LOG_INFO, &host->complaint,
"snmp plugin: host %s: snmp_sess_synch_response successful.",
host->name);
vb = res->variables;
if (vb == NULL)
{
status = -1;
break;
}
/* Check if all values (and possibly the instance) have left their
* subtree */
if (csnmp_check_res_left_subtree (host, data, res) != 0)
{
status = 0;
break;
}
/* if an instance-OID is configured.. */
if (data->instance.oid.oid_len > 0)
{
/* Allocate a new `csnmp_list_instances_t', insert the instance name and
* add it to the list */
if (csnmp_instance_list_add (&instance_list, &instance_list_ptr,
res) != 0)
{
ERROR ("snmp plugin: csnmp_instance_list_add failed.");
status = -1;
break;
}
/* Set vb on the last variable */
for (vb = res->variables;
(vb != NULL) && (vb->next_variable != NULL);
vb = vb->next_variable)
/* do nothing */;
assert (vb != NULL);
/* Copy OID to oid_list[data->values_len] */
memcpy (oid_list[data->values_len].oid, vb->name,
sizeof (oid) * vb->name_length);
oid_list[data->values_len].oid_len = vb->name_length;
}
for (vb = res->variables, i = 0;
(vb != NULL) && (i < data->values_len);
vb = vb->next_variable, i++)
{
csnmp_table_values_t *vt;
/* Check if we left the subtree */
if (snmp_oid_ncompare (data->values[i].oid,
data->values[i].oid_len,
vb->name, vb->name_length,
data->values[i].oid_len) != 0)
{
DEBUG ("snmp plugin: host = %s; data = %s; Value %i left its subtree.",
host->name, data->name, i);
continue;
}
if ((value_table_ptr[i] != NULL)
&& (vb->name[vb->name_length - 1] <= value_table_ptr[i]->subid))
{
DEBUG ("snmp plugin: host = %s; data = %s; i = %i; "
"SUBID is not increasing.",
host->name, data->name, i);
continue;
}
vt = (csnmp_table_values_t *) malloc (sizeof (csnmp_table_values_t));
if (vt == NULL)
{
ERROR ("snmp plugin: malloc failed.");
status = -1;
break;
}
vt->subid = vb->name[vb->name_length - 1];
vt->value = csnmp_value_list_to_value (vb, ds->ds[i].type,
data->scale, data->shift);
vt->next = NULL;
if (value_table_ptr[i] == NULL)
value_table[i] = vt;
else
value_table_ptr[i]->next = vt;
value_table_ptr[i] = vt;
/* Copy OID to oid_list[i + 1] */
memcpy (oid_list[i].oid, vb->name, sizeof (oid) * vb->name_length);
oid_list[i].oid_len = vb->name_length;
} /* for (i = data->values_len) */
if (res != NULL)
snmp_free_pdu (res);
res = NULL;
} /* while (status == 0) */
if (res != NULL)
snmp_free_pdu (res);
res = NULL;
if (status == 0)
csnmp_dispatch_table (host, data, instance_list, value_table);
/* Free all allocated variables here */
while (instance_list != NULL)
{
instance_list_ptr = instance_list->next;
sfree (instance_list);
instance_list = instance_list_ptr;
}
for (i = 0; i < data->values_len; i++)
{
csnmp_table_values_t *tmp;
while (value_table[i] != NULL)
{
tmp = value_table[i]->next;
sfree (value_table[i]);
value_table[i] = tmp;
}
}
sfree (value_table);
sfree (oid_list);
return (0);
} /* int csnmp_read_table */
static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
{
struct snmp_pdu *req;
struct snmp_pdu *res;
struct variable_list *vb;
const data_set_t *ds;
oid_t *oid_list;
uint32_t oid_list_len;
int status;
int i;
/* `value_list_head' and `value_list_tail' implement a linked list for each
* value. `instance_list_head' and `instance_list_tail' implement a linked list of
* instance names. This is used to jump gaps in the table. */
csnmp_list_instances_t *instance_list_head;
csnmp_list_instances_t *instance_list_tail;
csnmp_table_values_t **value_list_head;
csnmp_table_values_t **value_list_tail;
DEBUG ("snmp plugin: csnmp_read_table (host = %s, data = %s)",
host->name, data->name);
if (host->sess_handle == NULL)
{
DEBUG ("snmp plugin: csnmp_read_table: host->sess_handle == NULL");
return (-1);
}
ds = plugin_get_ds (data->type);
if (!ds)
{
ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
return (-1);
}
if (ds->ds_num != data->values_len)
{
ERROR ("snmp plugin: DataSet `%s' requires %i values, but config talks about %i",
data->type, ds->ds_num, data->values_len);
return (-1);
}
/* We need a copy of all the OIDs, because GETNEXT will destroy them. */
oid_list_len = data->values_len + 1;
oid_list = (oid_t *) malloc (sizeof (oid_t) * (oid_list_len));
if (oid_list == NULL)
{
ERROR ("snmp plugin: csnmp_read_table: malloc failed.");
return (-1);
}
memcpy (oid_list, data->values, data->values_len * sizeof (oid_t));
if (data->instance.oid.oid_len > 0)
memcpy (oid_list + data->values_len, &data->instance.oid, sizeof (oid_t));
else
oid_list_len--;
/* We're going to construct n linked lists, one for each "value".
* value_list_head will contain pointers to the heads of these linked lists,
* value_list_tail will contain pointers to the tail of the lists. */
value_list_head = calloc (data->values_len, sizeof (*value_list_head));
value_list_tail = calloc (data->values_len, sizeof (*value_list_tail));
if ((value_list_head == NULL) || (value_list_tail == NULL))
{
ERROR ("snmp plugin: csnmp_read_table: calloc failed.");
sfree (oid_list);
sfree (value_list_head);
sfree (value_list_tail);
return (-1);
}
instance_list_head = NULL;
instance_list_tail = NULL;
status = 0;
while (status == 0)
{
req = snmp_pdu_create (SNMP_MSG_GETNEXT);
if (req == NULL)
{
ERROR ("snmp plugin: snmp_pdu_create failed.");
status = -1;
break;
}
for (i = 0; (uint32_t) i < oid_list_len; i++)
snmp_add_null_var (req, oid_list[i].oid, oid_list[i].oid_len);
res = NULL;
status = snmp_sess_synch_response (host->sess_handle, req, &res);
if ((status != STAT_SUCCESS) || (res == NULL))
{
char *errstr = NULL;
snmp_sess_error (host->sess_handle, NULL, NULL, &errstr);
c_complain (LOG_ERR, &host->complaint,
"snmp plugin: host %s: snmp_sess_synch_response failed: %s",
host->name, (errstr == NULL) ? "Unknown problem" : errstr);
if (res != NULL)
snmp_free_pdu (res);
res = NULL;
sfree (errstr);
csnmp_host_close_session (host);
status = -1;
break;
}
status = 0;
assert (res != NULL);
c_release (LOG_INFO, &host->complaint,
"snmp plugin: host %s: snmp_sess_synch_response successful.",
host->name);
vb = res->variables;
if (vb == NULL)
{
status = -1;
break;
}
/* Check if all values (and possibly the instance) have left their
* subtree */
if (csnmp_check_res_left_subtree (host, data, res) != 0)
{
status = 0;
break;
}
/* Copy the OID of the value used as instance to oid_list, if an instance
* is configured. */
if (data->instance.oid.oid_len > 0)
{
/* Allocate a new `csnmp_list_instances_t', insert the instance name and
* add it to the list */
if (csnmp_instance_list_add (&instance_list_head, &instance_list_tail,
res, host, data) != 0)
{
ERROR ("snmp plugin: csnmp_instance_list_add failed.");
status = -1;
break;
}
/* The instance OID is added to the list of OIDs to GET from the
* snmp agent last, so set vb on the last variable returned and copy
* that OID. */
for (vb = res->variables;
(vb != NULL) && (vb->next_variable != NULL);
vb = vb->next_variable)
/* do nothing */;
assert (vb != NULL);
/* Copy the OID of the instance value to oid_list[data->values_len].
* "oid_list" is used for the next GETNEXT request. */
memcpy (oid_list[data->values_len].oid, vb->name,
sizeof (oid) * vb->name_length);
oid_list[data->values_len].oid_len = vb->name_length;
}
/* Iterate over all the (non-instance) values returned by the agent. The
* (i < value_len) check will make sure we're not handling the instance OID
* twice. */
for (vb = res->variables, i = 0;
(vb != NULL) && (i < data->values_len);
vb = vb->next_variable, i++)
{
csnmp_table_values_t *vt;
oid_t vb_name;
oid_t suffix;
csnmp_oid_init (&vb_name, vb->name, vb->name_length);
/* Calculate the current suffix. This is later used to check that the
* suffix is increasing. This also checks if we left the subtree */
status = csnmp_oid_suffix (&suffix, &vb_name, data->values + i);
if (status != 0)
{
DEBUG ("snmp plugin: host = %s; data = %s; Value %i failed. "
"It probably left its subtree.",
host->name, data->name, i);
continue;
}
/* Make sure the OIDs returned by the agent are increasing. Otherwise our
* table matching algorithm will get confused. */
if ((value_list_tail[i] != NULL)
&& (csnmp_oid_compare (&suffix, &value_list_tail[i]->suffix) <= 0))
{
DEBUG ("snmp plugin: host = %s; data = %s; i = %i; "
"Suffix is not increasing.",
host->name, data->name, i);
continue;
}
vt = malloc (sizeof (*vt));
if (vt == NULL)
{
ERROR ("snmp plugin: malloc failed.");
status = -1;
break;
}
memset (vt, 0, sizeof (*vt));
vt->value = csnmp_value_list_to_value (vb, ds->ds[i].type,
data->scale, data->shift, host->name, data->name);
memcpy (&vt->suffix, &suffix, sizeof (vt->suffix));
vt->next = NULL;
if (value_list_tail[i] == NULL)
value_list_head[i] = vt;
else
value_list_tail[i]->next = vt;
value_list_tail[i] = vt;
/* Copy OID to oid_list[i + 1] */
memcpy (oid_list[i].oid, vb->name, sizeof (oid) * vb->name_length);
oid_list[i].oid_len = vb->name_length;
} /* for (i = data->values_len) */
if (res != NULL)
snmp_free_pdu (res);
res = NULL;
} /* while (status == 0) */
if (res != NULL)
snmp_free_pdu (res);
res = NULL;
if (status == 0)
csnmp_dispatch_table (host, data, instance_list_head, value_list_head);
/* Free all allocated variables here */
while (instance_list_head != NULL)
{
csnmp_list_instances_t *next = instance_list_head->next;
sfree (instance_list_head);
instance_list_head = next;
}
for (i = 0; i < data->values_len; i++)
{
while (value_list_head[i] != NULL)
{
csnmp_table_values_t *next = value_list_head[i]->next;
sfree (value_list_head[i]);
value_list_head[i] = next;
}
}
sfree (value_list_head);
sfree (value_list_tail);
sfree (oid_list);
return (0);
} /* int csnmp_read_table */