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snmp.c
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snmp.c
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/**
* collectd - src/snmp.c
* Copyright (C) 2007 Florian octo Forster
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; only version 2 of the License is applicable.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
* Florian octo Forster <octo at verplant.org>
**/
#include "collectd.h"
#include "common.h"
#include "plugin.h"
#include "utils_complain.h"
#include <pthread.h>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
/*
* Private data structes
*/
struct oid_s
{
oid oid[MAX_OID_LEN];
size_t oid_len;
};
typedef struct oid_s oid_t;
union instance_u
{
char string[DATA_MAX_NAME_LEN];
oid_t oid;
};
typedef union instance_u instance_t;
struct data_definition_s
{
char *name; /* used to reference this from the `Collect' option */
char *type; /* used to find the data_set */
int is_table;
instance_t instance;
char *instance_prefix;
oid_t *values;
int values_len;
double scale;
double shift;
struct data_definition_s *next;
};
typedef struct data_definition_s data_definition_t;
struct host_definition_s
{
char *name;
char *address;
char *community;
int version;
void *sess_handle;
c_complain_t complaint;
uint32_t interval;
data_definition_t **data_list;
int data_list_len;
};
typedef struct host_definition_s host_definition_t;
/* These two types are used to cache values in `csnmp_read_table' to handle
* gaps in tables. */
struct csnmp_list_instances_s
{
oid subid;
char instance[DATA_MAX_NAME_LEN];
struct csnmp_list_instances_s *next;
};
typedef struct csnmp_list_instances_s csnmp_list_instances_t;
struct csnmp_table_values_s
{
oid subid;
value_t value;
struct csnmp_table_values_s *next;
};
typedef struct csnmp_table_values_s csnmp_table_values_t;
/*
* Private variables
*/
static data_definition_t *data_head = NULL;
/*
* Prototypes
*/
static int csnmp_read_host (user_data_t *ud);
/*
* Private functions
*/
static void csnmp_host_close_session (host_definition_t *host) /* {{{ */
{
if (host->sess_handle == NULL)
return;
snmp_sess_close (host->sess_handle);
host->sess_handle = NULL;
} /* }}} void csnmp_host_close_session */
static void csnmp_host_definition_destroy (void *arg) /* {{{ */
{
host_definition_t *hd;
hd = arg;
if (hd == NULL)
return;
if (hd->name != NULL)
{
DEBUG ("snmp plugin: Destroying host definition for host `%s'.",
hd->name);
}
csnmp_host_close_session (hd);
sfree (hd->name);
sfree (hd->address);
sfree (hd->community);
sfree (hd->data_list);
sfree (hd);
} /* }}} void csnmp_host_definition_destroy */
/* Many functions to handle the configuration. {{{ */
/* First there are many functions which do configuration stuff. It's a big
* bloated and messy, I'm afraid. */
/*
* Callgraph for the config stuff:
* csnmp_config
* +-> call_snmp_init_once
* +-> csnmp_config_add_data
* ! +-> csnmp_config_add_data_type
* ! +-> csnmp_config_add_data_table
* ! +-> csnmp_config_add_data_instance
* ! +-> csnmp_config_add_data_instance_prefix
* ! +-> csnmp_config_add_data_values
* +-> csnmp_config_add_host
* +-> csnmp_config_add_host_address
* +-> csnmp_config_add_host_community
* +-> csnmp_config_add_host_version
* +-> csnmp_config_add_host_collect
* +-> csnmp_config_add_host_interval
*/
static void call_snmp_init_once (void)
{
static int have_init = 0;
if (have_init == 0)
init_snmp (PACKAGE_NAME);
have_init = 1;
} /* void call_snmp_init_once */
static int csnmp_config_add_data_type (data_definition_t *dd, oconfig_item_t *ci)
{
if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
{
WARNING ("snmp plugin: `Type' needs exactly one string argument.");
return (-1);
}
sfree (dd->type);
dd->type = strdup (ci->values[0].value.string);
if (dd->type == NULL)
return (-1);
return (0);
} /* int csnmp_config_add_data_type */
static int csnmp_config_add_data_table (data_definition_t *dd, oconfig_item_t *ci)
{
if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_BOOLEAN))
{
WARNING ("snmp plugin: `Table' needs exactly one boolean argument.");
return (-1);
}
dd->is_table = ci->values[0].value.boolean ? 1 : 0;
return (0);
} /* int csnmp_config_add_data_table */
static int csnmp_config_add_data_instance (data_definition_t *dd, oconfig_item_t *ci)
{
if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
{
WARNING ("snmp plugin: `Instance' needs exactly one string argument.");
return (-1);
}
if (dd->is_table)
{
/* Instance is an OID */
dd->instance.oid.oid_len = MAX_OID_LEN;
if (!read_objid (ci->values[0].value.string,
dd->instance.oid.oid, &dd->instance.oid.oid_len))
{
ERROR ("snmp plugin: read_objid (%s) failed.",
ci->values[0].value.string);
return (-1);
}
}
else
{
/* Instance is a simple string */
sstrncpy (dd->instance.string, ci->values[0].value.string,
sizeof (dd->instance.string));
}
return (0);
} /* int csnmp_config_add_data_instance */
static int csnmp_config_add_data_instance_prefix (data_definition_t *dd,
oconfig_item_t *ci)
{
if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
{
WARNING ("snmp plugin: `InstancePrefix' needs exactly one string argument.");
return (-1);
}
if (!dd->is_table)
{
WARNING ("snmp plugin: data %s: InstancePrefix is ignored when `Table' "
"is set to `false'.", dd->name);
return (-1);
}
sfree (dd->instance_prefix);
dd->instance_prefix = strdup (ci->values[0].value.string);
if (dd->instance_prefix == NULL)
return (-1);
return (0);
} /* int csnmp_config_add_data_instance_prefix */
static int csnmp_config_add_data_values (data_definition_t *dd, oconfig_item_t *ci)
{
int i;
if (ci->values_num < 1)
{
WARNING ("snmp plugin: `Values' needs at least one argument.");
return (-1);
}
for (i = 0; i < ci->values_num; i++)
if (ci->values[i].type != OCONFIG_TYPE_STRING)
{
WARNING ("snmp plugin: `Values' needs only string argument.");
return (-1);
}
sfree (dd->values);
dd->values_len = 0;
dd->values = (oid_t *) malloc (sizeof (oid_t) * ci->values_num);
if (dd->values == NULL)
return (-1);
dd->values_len = ci->values_num;
for (i = 0; i < ci->values_num; i++)
{
dd->values[i].oid_len = MAX_OID_LEN;
if (NULL == snmp_parse_oid (ci->values[i].value.string,
dd->values[i].oid, &dd->values[i].oid_len))
{
ERROR ("snmp plugin: snmp_parse_oid (%s) failed.",
ci->values[i].value.string);
free (dd->values);
dd->values = NULL;
dd->values_len = 0;
return (-1);
}
}
return (0);
} /* int csnmp_config_add_data_instance */
static int csnmp_config_add_data_shift (data_definition_t *dd, oconfig_item_t *ci)
{
if ((ci->values_num != 1)
|| (ci->values[0].type != OCONFIG_TYPE_NUMBER))
{
WARNING ("snmp plugin: The `Scale' config option needs exactly one number argument.");
return (-1);
}
dd->shift = ci->values[0].value.number;
return (0);
} /* int csnmp_config_add_data_shift */
static int csnmp_config_add_data_scale (data_definition_t *dd, oconfig_item_t *ci)
{
if ((ci->values_num != 1)
|| (ci->values[0].type != OCONFIG_TYPE_NUMBER))
{
WARNING ("snmp plugin: The `Scale' config option needs exactly one number argument.");
return (-1);
}
dd->scale = ci->values[0].value.number;
return (0);
} /* int csnmp_config_add_data_scale */
static int csnmp_config_add_data (oconfig_item_t *ci)
{
data_definition_t *dd;
int status = 0;
int i;
if ((ci->values_num != 1)
|| (ci->values[0].type != OCONFIG_TYPE_STRING))
{
WARNING ("snmp plugin: The `Data' config option needs exactly one string argument.");
return (-1);
}
dd = (data_definition_t *) malloc (sizeof (data_definition_t));
if (dd == NULL)
return (-1);
memset (dd, '\0', sizeof (data_definition_t));
dd->name = strdup (ci->values[0].value.string);
if (dd->name == NULL)
{
free (dd);
return (-1);
}
dd->scale = 1.0;
dd->shift = 0.0;
for (i = 0; i < ci->children_num; i++)
{
oconfig_item_t *option = ci->children + i;
status = 0;
if (strcasecmp ("Type", option->key) == 0)
status = csnmp_config_add_data_type (dd, option);
else if (strcasecmp ("Table", option->key) == 0)
status = csnmp_config_add_data_table (dd, option);
else if (strcasecmp ("Instance", option->key) == 0)
status = csnmp_config_add_data_instance (dd, option);
else if (strcasecmp ("InstancePrefix", option->key) == 0)
status = csnmp_config_add_data_instance_prefix (dd, option);
else if (strcasecmp ("Values", option->key) == 0)
status = csnmp_config_add_data_values (dd, option);
else if (strcasecmp ("Shift", option->key) == 0)
status = csnmp_config_add_data_shift (dd, option);
else if (strcasecmp ("Scale", option->key) == 0)
status = csnmp_config_add_data_scale (dd, option);
else
{
WARNING ("snmp plugin: Option `%s' not allowed here.", option->key);
status = -1;
}
if (status != 0)
break;
} /* for (ci->children) */
while (status == 0)
{
if (dd->type == NULL)
{
WARNING ("snmp plugin: `Type' not given for data `%s'", dd->name);
status = -1;
break;
}
if (dd->values == NULL)
{
WARNING ("snmp plugin: No `Value' given for data `%s'", dd->name);
status = -1;
break;
}
break;
} /* while (status == 0) */
if (status != 0)
{
sfree (dd->name);
sfree (dd->instance_prefix);
sfree (dd->values);
sfree (dd);
return (-1);
}
DEBUG ("snmp plugin: dd = { name = %s, type = %s, is_table = %s, values_len = %i }",
dd->name, dd->type, (dd->is_table != 0) ? "true" : "false", dd->values_len);
if (data_head == NULL)
data_head = dd;
else
{
data_definition_t *last;
last = data_head;
while (last->next != NULL)
last = last->next;
last->next = dd;
}
return (0);
} /* int csnmp_config_add_data */
static int csnmp_config_add_host_address (host_definition_t *hd, oconfig_item_t *ci)
{
if ((ci->values_num != 1)
|| (ci->values[0].type != OCONFIG_TYPE_STRING))
{
WARNING ("snmp plugin: The `Address' config option needs exactly one string argument.");
return (-1);
}
if (hd->address == NULL)
free (hd->address);
hd->address = strdup (ci->values[0].value.string);
if (hd->address == NULL)
return (-1);
DEBUG ("snmp plugin: host = %s; host->address = %s;",
hd->name, hd->address);
return (0);
} /* int csnmp_config_add_host_address */
static int csnmp_config_add_host_community (host_definition_t *hd, oconfig_item_t *ci)
{
if ((ci->values_num != 1)
|| (ci->values[0].type != OCONFIG_TYPE_STRING))
{
WARNING ("snmp plugin: The `Community' config option needs exactly one string argument.");
return (-1);
}
if (hd->community == NULL)
free (hd->community);
hd->community = strdup (ci->values[0].value.string);
if (hd->community == NULL)
return (-1);
DEBUG ("snmp plugin: host = %s; host->community = %s;",
hd->name, hd->community);
return (0);
} /* int csnmp_config_add_host_community */
static int csnmp_config_add_host_version (host_definition_t *hd, oconfig_item_t *ci)
{
int version;
if ((ci->values_num != 1)
|| (ci->values[0].type != OCONFIG_TYPE_NUMBER))
{
WARNING ("snmp plugin: The `Version' config option needs exactly one number argument.");
return (-1);
}
version = (int) ci->values[0].value.number;
if ((version != 1) && (version != 2))
{
WARNING ("snmp plugin: `Version' must either be `1' or `2'.");
return (-1);
}
hd->version = version;
return (0);
} /* int csnmp_config_add_host_address */
static int csnmp_config_add_host_collect (host_definition_t *host,
oconfig_item_t *ci)
{
data_definition_t *data;
data_definition_t **data_list;
int data_list_len;
int i;
if (ci->values_num < 1)
{
WARNING ("snmp plugin: `Collect' needs at least one argument.");
return (-1);
}
for (i = 0; i < ci->values_num; i++)
if (ci->values[i].type != OCONFIG_TYPE_STRING)
{
WARNING ("snmp plugin: All arguments to `Collect' must be strings.");
return (-1);
}
data_list_len = host->data_list_len + ci->values_num;
data_list = (data_definition_t **) realloc (host->data_list,
sizeof (data_definition_t *) * data_list_len);
if (data_list == NULL)
return (-1);
host->data_list = data_list;
for (i = 0; i < ci->values_num; i++)
{
for (data = data_head; data != NULL; data = data->next)
if (strcasecmp (ci->values[i].value.string, data->name) == 0)
break;
if (data == NULL)
{
WARNING ("snmp plugin: No such data configured: `%s'",
ci->values[i].value.string);
continue;
}
DEBUG ("snmp plugin: Collect: host = %s, data[%i] = %s;",
host->name, host->data_list_len, data->name);
host->data_list[host->data_list_len] = data;
host->data_list_len++;
} /* for (values_num) */
return (0);
} /* int csnmp_config_add_host_collect */
static int csnmp_config_add_host_interval (host_definition_t *hd, oconfig_item_t *ci)
{
if ((ci->values_num != 1)
|| (ci->values[0].type != OCONFIG_TYPE_NUMBER))
{
WARNING ("snmp plugin: The `Interval' config option needs exactly one number argument.");
return (-1);
}
hd->interval = ci->values[0].value.number >= 0
? (uint32_t) ci->values[0].value.number
: 0;
return (0);
} /* int csnmp_config_add_host_interval */
static int csnmp_config_add_host (oconfig_item_t *ci)
{
host_definition_t *hd;
int status = 0;
int i;
/* Registration stuff. */
char cb_name[DATA_MAX_NAME_LEN];
user_data_t cb_data;
struct timespec cb_interval;
if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
{
WARNING ("snmp plugin: `Host' needs exactly one string argument.");
return (-1);
}
hd = (host_definition_t *) malloc (sizeof (host_definition_t));
if (hd == NULL)
return (-1);
memset (hd, '\0', sizeof (host_definition_t));
hd->version = 2;
C_COMPLAIN_INIT (&hd->complaint);
hd->name = strdup (ci->values[0].value.string);
if (hd->name == NULL)
{
free (hd);
return (-1);
}
hd->sess_handle = NULL;
hd->interval = 0;
for (i = 0; i < ci->children_num; i++)
{
oconfig_item_t *option = ci->children + i;
status = 0;
if (strcasecmp ("Address", option->key) == 0)
status = csnmp_config_add_host_address (hd, option);
else if (strcasecmp ("Community", option->key) == 0)
status = csnmp_config_add_host_community (hd, option);
else if (strcasecmp ("Version", option->key) == 0)
status = csnmp_config_add_host_version (hd, option);
else if (strcasecmp ("Collect", option->key) == 0)
csnmp_config_add_host_collect (hd, option);
else if (strcasecmp ("Interval", option->key) == 0)
csnmp_config_add_host_interval (hd, option);
else
{
WARNING ("snmp plugin: csnmp_config_add_host: Option `%s' not allowed here.", option->key);
status = -1;
}
if (status != 0)
break;
} /* for (ci->children) */
while (status == 0)
{
if (hd->address == NULL)
{
WARNING ("snmp plugin: `Address' not given for host `%s'", hd->name);
status = -1;
break;
}
if (hd->community == NULL)
{
WARNING ("snmp plugin: `Community' not given for host `%s'", hd->name);
status = -1;
break;
}
break;
} /* while (status == 0) */
if (status != 0)
{
csnmp_host_definition_destroy (hd);
return (-1);
}
DEBUG ("snmp plugin: hd = { name = %s, address = %s, community = %s, version = %i }",
hd->name, hd->address, hd->community, hd->version);
ssnprintf (cb_name, sizeof (cb_name), "snmp-%s", hd->name);
memset (&cb_data, 0, sizeof (cb_data));
cb_data.data = hd;
cb_data.free_func = csnmp_host_definition_destroy;
memset (&cb_interval, 0, sizeof (cb_interval));
if (hd->interval != 0)
cb_interval.tv_sec = (time_t) hd->interval;
status = plugin_register_complex_read (/* group = */ NULL, cb_name,
csnmp_read_host, /* interval = */ &cb_interval,
/* user_data = */ &cb_data);
if (status != 0)
{
ERROR ("snmp plugin: Registering complex read function failed.");
csnmp_host_definition_destroy (hd);
return (-1);
}
return (0);
} /* int csnmp_config_add_host */
static int csnmp_config (oconfig_item_t *ci)
{
int i;
call_snmp_init_once ();
for (i = 0; i < ci->children_num; i++)
{
oconfig_item_t *child = ci->children + i;
if (strcasecmp ("Data", child->key) == 0)
csnmp_config_add_data (child);
else if (strcasecmp ("Host", child->key) == 0)
csnmp_config_add_host (child);
else
{
WARNING ("snmp plugin: Ignoring unknown config option `%s'.", child->key);
}
} /* for (ci->children) */
return (0);
} /* int csnmp_config */
/* }}} End of the config stuff. Now the interesting part begins */
static void csnmp_host_open_session (host_definition_t *host)
{
struct snmp_session sess;
if (host->sess_handle != NULL)
csnmp_host_close_session (host);
snmp_sess_init (&sess);
sess.peername = host->address;
sess.community = (u_char *) host->community;
sess.community_len = strlen (host->community);
sess.version = (host->version == 1) ? SNMP_VERSION_1 : SNMP_VERSION_2c;
/* snmp_sess_open will copy the `struct snmp_session *'. */
host->sess_handle = snmp_sess_open (&sess);
if (host->sess_handle == NULL)
{
char *errstr = NULL;
snmp_error (&sess, NULL, NULL, &errstr);
ERROR ("snmp plugin: host %s: snmp_sess_open failed: %s",
host->name, (errstr == NULL) ? "Unknown problem" : errstr);
sfree (errstr);
}
} /* void csnmp_host_open_session */
/* TODO: Check if negative values wrap around. Problem: negative temperatures. */
static value_t csnmp_value_list_to_value (struct variable_list *vl, int type,
double scale, double shift)
{
value_t ret;
uint64_t tmp_unsigned = 0;
int64_t tmp_signed = 0;
int defined = 1;
if ((vl->type == ASN_INTEGER)
|| (vl->type == ASN_UINTEGER)
|| (vl->type == ASN_COUNTER)
#ifdef ASN_TIMETICKS
|| (vl->type == ASN_TIMETICKS)
#endif
|| (vl->type == ASN_GAUGE))
{
tmp_unsigned = (uint32_t) *vl->val.integer;
tmp_signed = (int32_t) *vl->val.integer;
DEBUG ("snmp plugin: Parsed int32 value is %"PRIi64".", tmp_signed);
}
else if (vl->type == ASN_COUNTER64)
{
tmp_unsigned = (uint32_t) vl->val.counter64->high;
tmp_unsigned = tmp_unsigned << 32;
tmp_unsigned += (uint32_t) vl->val.counter64->low;
tmp_signed = (int64_t) tmp_unsigned;
DEBUG ("snmp plugin: Parsed int64 value is %"PRIu64".", tmp_unsigned);
}
else if (vl->type == ASN_OCTET_STR)
{
/* We'll handle this later.. */
}
else
{
char oid_buffer[1024];
memset (oid_buffer, 0, sizeof (oid_buffer));
snprint_objid (oid_buffer, sizeof (oid_buffer) - 1,
vl->name, vl->name_length);
#ifdef ASN_NULL
if (vl->type == ASN_NULL)
INFO ("snmp plugin: OID \"%s\" is undefined (type ASN_NULL)",
oid_buffer);
else
#endif
WARNING ("snmp plugin: I don't know the ASN type \"%i\" (OID: %s)",
(int) vl->type, oid_buffer);
defined = 0;
}
if (vl->type == ASN_OCTET_STR)
{
int status = -1;
if (vl->val.string != NULL)
{
char string[64];
size_t string_length;
string_length = sizeof (string) - 1;
if (vl->val_len < string_length)
string_length = vl->val_len;
/* The strings we get from the Net-SNMP library may not be null
* terminated. That is why we're using `memcpy' here and not `strcpy'.
* `string_length' is set to `vl->val_len' which holds the length of the
* string. -octo */
memcpy (string, vl->val.string, string_length);
string[string_length] = 0;
status = parse_value (string, &ret, type);
if (status != 0)
{
ERROR ("snmp plugin: csnmp_value_list_to_value: Parsing string as %s failed: %s",
DS_TYPE_TO_STRING (type), string);
}
}
if (status != 0)
{
switch (type)
{
case DS_TYPE_COUNTER:
case DS_TYPE_DERIVE:
case DS_TYPE_ABSOLUTE:
memset (&ret, 0, sizeof (ret));
break;
case DS_TYPE_GAUGE:
ret.gauge = NAN;
break;
default:
ERROR ("snmp plugin: csnmp_value_list_to_value: Unknown "
"data source type: %i.", type);
ret.gauge = NAN;
}
}
} /* if (vl->type == ASN_OCTET_STR) */
else if (type == DS_TYPE_COUNTER)
{
ret.counter = tmp_unsigned;
}
else if (type == DS_TYPE_GAUGE)
{
ret.gauge = NAN;
if (defined != 0)
ret.gauge = (scale * tmp_signed) + shift;
}
else if (type == DS_TYPE_DERIVE)
ret.derive = (derive_t) tmp_signed;
else if (type == DS_TYPE_ABSOLUTE)
ret.absolute = (absolute_t) tmp_unsigned;
else
{
ERROR ("snmp plugin: csnmp_value_list_to_value: Unknown data source "
"type: %i.", type);
ret.gauge = NAN;
}
return (ret);
} /* value_t csnmp_value_list_to_value */
/* Returns true if all OIDs have left their subtree */
static int csnmp_check_res_left_subtree (const host_definition_t *host,
const data_definition_t *data,
struct snmp_pdu *res)
{
struct variable_list *vb;
int num_checked;
int num_left_subtree;
int i;
vb = res->variables;
if (vb == NULL)
return (-1);
num_checked = 0;
num_left_subtree = 0;
/* check all the variables and count how many have left their subtree */
for (vb = res->variables, i = 0;
(vb != NULL) && (i < data->values_len);
vb = vb->next_variable, i++)
{
num_checked++;
if (snmp_oid_ncompare (data->values[i].oid,
data->values[i].oid_len,
vb->name, vb->name_length,
data->values[i].oid_len) != 0)
num_left_subtree++;
}
/* check if enough variables have been returned */
if (i < data->values_len)
{
ERROR ("snmp plugin: host %s: Expected %i variables, but got only %i",
host->name, data->values_len, i);
return (-1);
}
if (data->instance.oid.oid_len > 0)
{
if (vb == NULL)
{
ERROR ("snmp plugin: host %s: Expected one more variable for "
"the instance..", host->name);
return (-1);
}
num_checked++;
if (snmp_oid_ncompare (data->instance.oid.oid,
data->instance.oid.oid_len,
vb->name, vb->name_length,
data->instance.oid.oid_len) != 0)
num_left_subtree++;
}
DEBUG ("snmp plugin: csnmp_check_res_left_subtree: %i of %i variables have "
"left their subtree",
num_left_subtree, num_checked);
if (num_left_subtree >= num_checked)
return (1);
return (0);
} /* int csnmp_check_res_left_subtree */
static int csnmp_strvbcopy_hexstring (char *dst, /* {{{ */
const struct variable_list *vb, size_t dst_size)
{
char *buffer_ptr;
size_t buffer_free;
size_t i;
buffer_ptr = dst;
buffer_free = dst_size;
for (i = 0; i < vb->val_len; i++)
{
int status;
status = snprintf (buffer_ptr, buffer_free,
(i == 0) ? "%02x" : ":%02x", (unsigned int) vb->val.bitstring[i]);
if (status >= buffer_free)
{
buffer_ptr += (buffer_free - 1);
*buffer_ptr = 0;
return (dst_size + (buffer_free - status));
}
else /* if (status < buffer_free) */
{
buffer_ptr += status;
buffer_free -= status;
}
}
return ((int) (dst_size - buffer_free));
} /* }}} int csnmp_strvbcopy_hexstring */
static int csnmp_strvbcopy (char *dst, /* {{{ */
const struct variable_list *vb, size_t dst_size)
{
char *src;
size_t num_chars;
size_t i;
if (vb->type == ASN_OCTET_STR)
src = (char *) vb->val.string;
else if (vb->type == ASN_BIT_STR)
src = (char *) vb->val.bitstring;
else
{
dst[0] = 0;
return (EINVAL);
}
num_chars = dst_size - 1;
if (num_chars > vb->val_len)
num_chars = vb->val_len;
for (i = 0; i < num_chars; i++)
{
/* Check for control characters. */
if ((unsigned char)src[i] < 32)
return (csnmp_strvbcopy_hexstring (dst, vb, dst_size));
dst[i] = src[i];
}
dst[num_chars] = 0;
return ((int) vb->val_len);
} /* }}} int csnmp_strvbcopy */
static int csnmp_instance_list_add (csnmp_list_instances_t **head,
csnmp_list_instances_t **tail,
const struct snmp_pdu *res)
{
csnmp_list_instances_t *il;
struct variable_list *vb;
/* Set vb on the last variable */
for (vb = res->variables;
(vb != NULL) && (vb->next_variable != NULL);
vb = vb->next_variable)
/* do nothing */;
if (vb == NULL)
return (-1);
il = (csnmp_list_instances_t *) malloc (sizeof (csnmp_list_instances_t));
if (il == NULL)
{
ERROR ("snmp plugin: malloc failed.");
return (-1);
}
il->subid = vb->name[vb->name_length - 1];
il->next = NULL;