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snmp_lldp/source/modules/lldp_get.c

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/*
** L2 Discovery Module for LLDP
** Copyright (C) 2018 NTT Com Solutions Corporation
**
** 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; either version 2 of the License, or
** (at your option) any later version.
**
** 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
#include "sysinc.h"
#include "module.h"
#include "common.h"
#include "log.h"
#include "sysinfo.h"
#include "zbxalgo.h"
#include "zbxjson.h"
#define SNMP_NO_DEBUGGING /* disabling debugging messages from Net-SNMP library */
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#ifdef ZBX_PROGRAM_TYPE_SERVER
extern unsigned char program_type ;
#else /* ZBX_DAEMON_TYPE_SERVER (Zabbix2.x) */
extern unsigned char daemon_type ;
#endif
/******************************************************************************
* *
* optional value process function prototype. *
* *
* Parameters: in - [IN] input value before process *
* out - [OUT] processed value *
* max_out_len - [IN] max length of the output buffer *
* *
******************************************************************************/
typedef void (*lldpmod_optproc_func)(void *in, char *out, size_t max_out_len);
/* snmp discovery request structure */
typedef struct
{
int noid; /* number of all oid (include remote) */
int noid_rem; /* number of remote oid */
int noid_max; /* number of all oid (allocated memory size) */
char *lld_key_macro; /* lld_macro for index */
char *lld_remkey_macro; /* lld_macro for remote index */
char *lld_optvalue_macro; /* lld_macro for optional value */
lldpmod_optproc_func opt_func; /* function pointer for process optional value */
int *rem_map; /* link oid array(that mixed local and remote) to remote values array */
int *key_types; /* normal or remote: normal has index only, remote has index and remote_index */
int *res_types; /* string / integer: type of the result */
int *dump_flags; /* standard binary dump separator is space, but when mac address, separate by coron */
char **oids; /* retrieve oids */
char **lld_value_macros; /* lld_macro for value */
}
lldpmod_discovery_request_t;
/* discovered SNMP object, identified by its index */
typedef struct
{
oid index; /* object index */
char **values; /* an array of OID values stored in the same order as defined in OID key */
zbx_hashset_t *rem_objects; /* when get remote object, local object may have some remote objects indentified by remote index */
/* remote hash recursively have same data structure as local */
}
lldpmod_snmp_object_t;
/* helper data structure used by snmp discovery */
typedef struct
{
int num; /* array index of snmp value getting then */
zbx_hashset_t objects; /* local value hash identified by snmp index. it keeps snmp object */
lldpmod_discovery_request_t request; /* request information */
}
lldpmod_discovery_data_t;
/* helper data structure used by snmp get */
typedef struct
{
int res_type; /* string / bitstring / integer: type of the result (when object is not found, there is no hint of type) */
int dump_flag; /* standard binary dump separator is space, but when mac address, separate by coron */
oid index; /* required oid */
oid rem_index; /* required remote index */
AGENT_RESULT *result; /* snmp get result */
}
lldpmod_getrem_data_t;
#define SNMP_NAME "lldp_get_module"
#define MODULE_NAME "lldp_get module"
#define SUCCEED_WITH_VALUE (100)
/* key_type */
#define KEY_TYPE_LOC (1)
#define KEY_TYPE_REM (2)
/* res_type */
#define RES_TYPE_STR (1)
#define RES_TYPE_INT (2)
#define RES_TYPE_BSTR (3)
/* dump_flag */
#define DUMP_NORMAL (1)
#define DUMP_WITH_MAC (2)
/* return value when remote object is not found */
#define NC_STRVAL "** No Information **"
#define NC_INTVAL "99"
/* module keys */
#define MODULE_KEY_DISCOVERY "lldp.discovery"
#define MODULE_KEY_GET_OID "lldp.rem.getoid"
#define MODULE_KEY_REM_PORT_TYPE "lldp.rem.port.type"
#define MODULE_KEY_REM_PORT_ID "lldp.rem.port.id"
#define MODULE_KEY_REM_PORTDESC "lldp.rem.port.desc"
#define MODULE_KEY_REM_SYSNAME "lldp.rem.sysname"
#define MODULE_KEY_REM_SYS_DESC "lldp.rem.sys.desc"
/* retrieve oids */
#define LOC_PORTID_OID ".1.0.8802.1.1.2.1.3.7.1.3" /* LLDP-MIB::lldpLocPortId */
#define REM_TYPE_OID ".1.0.8802.1.1.2.1.4.1.1.6" /* LLDP-MIB::lldpRemPortIdSubtype */
#define REM_PORTID_OID ".1.0.8802.1.1.2.1.4.1.1.7" /* LLDP-MIB::lldpRemPortId */
#define REM_PORTDESC_OID ".1.0.8802.1.1.2.1.4.1.1.8" /* LLDP-MIB::lldpRemPortDesc */
#define REM_SYSNAME_OID ".1.0.8802.1.1.2.1.4.1.1.9" /* LLDP-MIB::lldpRemSysName */
#define REM_SYSDESC_OID ".1.0.8802.1.1.2.1.4.1.1.10" /* LLDP-MIB::lldpRemSysDesc */
#define REM_CHASSIS_TYPE_OID ".1.0.8802.1.1.2.1.4.1.1.4" /* LLDP-MIB::lldpRemChassisIdSubtype */
#define REM_CHASSIS_ID_OID ".1.0.8802.1.1.2.1.4.1.1.5" /* LLDP-MIB::lldpRemChassisId */
#define REM_CAP_SUPPORTED_OID ".1.0.8802.1.1.2.1.4.1.1.11" /* LLDP-MIB::lldpRemSysCapSupported */
#define REM_CAP_ENABLED_OID ".1.0.8802.1.1.2.1.4.1.1.12" /* LLDP-MIB::lldpRemSysCapEnabled */
#define IF_OID ".1.3.6.1.2.1.31.1.1.1.1" /* IF-MIB::ifName */
#define IF_DESC_OID ".1.3.6.1.2.1.2.2.1.2" /* IF-MIB::ifDescr */
#define IF_TYPE_OID ".1.3.6.1.2.1.2.2.1.3" /* IF-MIB::ifType */
/* lld macros */
#define LLD_MACRO_PORT_INDEX "{#PORT_NUM}"
#define LLD_MACRO_REM_INDEX "{#REM_IDX}"
#define LLD_MACRO_PORT_NAME "{#PORT_NAME}"
#define LLD_MACRO_PORT_IDENTIFIER "{#PORT_IDX}"
#define LLD_MACRO_PORT_DESC "{#PORT_DESC}"
#define LLD_MACRO_IF_TYPE "{#IF_TYPE}"
/* the variable keeps timeout setting for item processing */
static int item_timeout = 0;
/******************************************************************************
* *
* This is zbx_snmp_walk() callback function prototype. *
* *
* Parameters: arg - [IN] an user argument passed to lldpmod_snmp_walk() *
* function *
* var - [IN] the variable list processing now *
* *
******************************************************************************/
typedef int (lldpmod_snmpwalk_cb_func)(void *arg, const netsnmp_variable_list *var);
/* function prototype */
int lldpmod_lldp_discovery(AGENT_REQUEST *request, AGENT_RESULT *result);
int lldpmod_getrem_common(AGENT_REQUEST *request, AGENT_RESULT *result, const char *get_mib, lldpmod_getrem_data_t *getrem_data);
int lldpmod_getrem_port_type(AGENT_REQUEST *request, AGENT_RESULT *result);
int lldpmod_getrem_port_id(AGENT_REQUEST *request, AGENT_RESULT *result);
int lldpmod_getrem_port_desc(AGENT_REQUEST *request, AGENT_RESULT *result);
int lldpmod_getrem_sysname(AGENT_REQUEST *request, AGENT_RESULT *result);
int lldpmod_getrem_sys_desc(AGENT_REQUEST *request, AGENT_RESULT *result);
int lldpmod_getrem_oid(AGENT_REQUEST *request, AGENT_RESULT *result);
static ZBX_METRIC keys[] =
/* KEY FLAG FUNCTION TEST PARAMETERS */
{
{MODULE_KEY_DISCOVERY, CF_HAVEPARAMS, lldpmod_lldp_discovery, "{HOST.IP},public,local"},
{MODULE_KEY_REM_PORT_TYPE, CF_HAVEPARAMS, lldpmod_getrem_port_type, "{HOST.IP},{$SNMP_COMMUNITY},{#PORT_NUM},{#REM_IDX},{$FIXED_VAL}"},
{MODULE_KEY_REM_PORT_ID, CF_HAVEPARAMS, lldpmod_getrem_port_id, "{HOST.IP},{$SNMP_COMMUNITY},{#PORT_NUM},{#REM_IDX},{$FIXED_VAL}"},
{MODULE_KEY_REM_PORTDESC, CF_HAVEPARAMS, lldpmod_getrem_port_desc, "{HOST.IP},{$SNMP_COMMUNITY},{#PORT_NUM},{#REM_IDX},{$FIXED_VAL}"},
{MODULE_KEY_REM_SYSNAME, CF_HAVEPARAMS, lldpmod_getrem_sysname, "{HOST.IP},{$SNMP_COMMUNITY},{#PORT_NUM},{#REM_IDX},{$FIXED_VAL}"},
{MODULE_KEY_REM_SYS_DESC, CF_HAVEPARAMS, lldpmod_getrem_sys_desc, "{HOST.IP},{$SNMP_COMMUNITY},{#PORT_NUM},{#REM_IDX},{$FIXED_VAL}"},
{MODULE_KEY_GET_OID, CF_HAVEPARAMS, lldpmod_getrem_oid, "{HOST.IP},{$SNMP_COMMUNITY},LLDP-MIB::lldpRemSysDesc,{#PORT_NUM},{#REM_IDX}"},
{NULL}
};
/******************************************************************************
* *
* Function: zbx_module_api_version *
* *
* Purpose: returns version number of the module interface *
* *
* Return value: ZBX_MODULE_API_VERSION - version of module.h module is *
* compiled with, in order to load module successfully Zabbix *
* MUST be compiled with the same version of this header file *
* *
******************************************************************************/
int zbx_module_api_version(void)
{
#ifdef ZBX_MODULE_API_VERSION
return ZBX_MODULE_API_VERSION;
#else /* ZBX_MODULE_API_VERSION_ONE (Zabbix2.x) */
return ZBX_MODULE_API_VERSION_ONE;
#endif
}
/******************************************************************************
* *
* Function: zbx_module_item_timeout *
* *
* Purpose: set timeout value for processing of items *
* *
* Parameters: timeout - timeout in seconds, 0 - no timeout set *
* *
******************************************************************************/
void zbx_module_item_timeout(int timeout)
{
item_timeout = timeout;
}
/******************************************************************************
* *
* Function: zbx_module_item_list *
* *
* Purpose: returns list of item keys supported by the module *
* *
* Return value: list of item keys *
* *
******************************************************************************/
ZBX_METRIC *zbx_module_item_list(void)
{
return keys;
}
/******************************************************************************
* *
* Function: zbx_module_init *
* *
* Purpose: the function is called on agent startup *
* It should be used to call any initialization routines *
* *
* Return value: ZBX_MODULE_OK - success *
* ZBX_MODULE_FAIL - module initialization failed *
* *
* Comment: the module won't be loaded in case of ZBX_MODULE_FAIL *
* *
******************************************************************************/
int zbx_module_init(void)
{
int ret = ZBX_MODULE_FAIL;
#ifdef ZBX_PROGRAM_TYPE_SERVER
switch (program_type)
{
case ZBX_PROGRAM_TYPE_SERVER:
zabbix_log(LOG_LEVEL_WARNING, "%s: loaded by server process. [%d]", MODULE_NAME, program_type);
ret = ZBX_MODULE_OK;
break;
case ZBX_PROGRAM_TYPE_PROXY_ACTIVE:
case ZBX_PROGRAM_TYPE_PROXY_PASSIVE:
case ZBX_PROGRAM_TYPE_PROXY:
zabbix_log(LOG_LEVEL_WARNING, "%s: loaded by proxy process. [%d]", MODULE_NAME, program_type);
ret = ZBX_MODULE_OK;
break;
case ZBX_PROGRAM_TYPE_AGENTD:
zabbix_log(LOG_LEVEL_INFORMATION, "%s: This loadable-module is not runnning by agent process. [%d]", MODULE_NAME, program_type);
break;
default:
zabbix_log(LOG_LEVEL_INFORMATION, "%s: unknown program_type [%d]", MODULE_NAME, program_type );
}
#else /* ZBX_DAEMON_TYPE_SERVER (Zabbix2.x) */
switch (daemon_type)
{
case ZBX_DAEMON_TYPE_SERVER:
zabbix_log(LOG_LEVEL_WARNING, "%s: loaded by server process. [%d]", MODULE_NAME, daemon_type);
ret = ZBX_MODULE_OK;
break;
case ZBX_DAEMON_TYPE_PROXY_ACTIVE:
case ZBX_DAEMON_TYPE_PROXY_PASSIVE:
case ZBX_DAEMON_TYPE_PROXY:
zabbix_log(LOG_LEVEL_WARNING, "%s: loaded by proxy process. [%d]", MODULE_NAME, daemon_type);
ret = ZBX_MODULE_OK;
break;
case ZBX_DAEMON_TYPE_AGENT:
zabbix_log(LOG_LEVEL_INFORMATION, "%s: This loadable-module is not runnning by agent process. [%d]", MODULE_NAME, daemon_type);
break;
default:
zabbix_log(LOG_LEVEL_INFORMATION, "%s: unknown daemon_type [%d]", MODULE_NAME, daemon_type );
}
#endif
init_snmp(SNMP_NAME);
return ret;
}
/******************************************************************************
* *
* Function: zbx_module_uninit *
* *
* Purpose: the function is called on agent shutdown *
* It should be used to cleanup used resources if there are any *
* *
* Return value: ZBX_MODULE_OK - success *
* ZBX_MODULE_FAIL - function failed *
* *
******************************************************************************/
int zbx_module_uninit(void)
{
snmp_shutdown(SNMP_NAME);
return ZBX_MODULE_OK;
}
/******************************************************************************
* *
* Function: get_if_idx *
* *
* Purpose: substring lower 2 digits from oid (to link if_index to portid) *
* *
* Parameters: in - [IN] oid *
* out - [OUT] extracted string buffer *
* max_out_len - [IN] buffer length *
* *
******************************************************************************/
static void get_if_idx(void *in, char *out, size_t max_out_len)
{
oid *port_num = (oid *)in;
char temp_char[MAX_ID_LEN];
char *temp_start;
zbx_snprintf(temp_char, sizeof(temp_char), "%lu", *port_num);
if (strlen(temp_char) >= 2)
{
if (temp_char[strlen(temp_char) - 2] == '0')
{
temp_start = &temp_char[strlen(temp_char) - 1];
}
else
{
temp_start = &temp_char[strlen(temp_char) - 2];
}
}
else
{
temp_start = temp_char;
}
zbx_strlcpy(out, temp_start, max_out_len);
}
/******************************************************************************
* *
* Function: dump *
* *
* Purpose: dump binary data *
* *
* Parameters: separator - [IN] specify separator *
* src - [IN] original data *
* srclen - [IN] original data length *
* dest - [OUT] output string *
* *
******************************************************************************/
static void dump(const char separator, const unsigned char *src, size_t srclen, char *dest)
{
size_t i;
char *dstp = dest;
for (i = 0; i < srclen; i++)
{
zbx_snprintf(dstp, (srclen * 3) - (i * 3), "%02X%c", src[i], separator);
dstp += 3;
}
*(dstp - 1) = '\0';
}
/******************************************************************************
* *
* Function: isasciistr *
* *
* Purpose: check data is binary or ascii string *
* *
* Parameters: cz - [IN] target data *
* len - [IN] target length *
* srclen - [IN] original data length *
* dest - [OUT] output string *
* *
* Return value: TRUE - target is ascii string *
* FALSE - target is not ascii string *
* *
******************************************************************************/
static int isasciistr(unsigned char *cz, size_t len)
{
int i;
if (len <= 0) return TRUE;
for (i = 0; i < len; i++)
{
/* depending on the implementation of the target device, */
/* sometimes it has '0x00' at the end of the string. */
/* (probably it seems to be a bug that does not consider */
/* the length of the terminate character.) */
/* In order to avoid being judged as binary at that time, */
/* make it recognize as a character string only */
/* when the last character is '0x00' */
if (!isprint(cz[i]) && !isspace(cz[i]))
{
if (i < (len - 1) || (i == (len - 1) && 0 != cz[i]))
return FALSE;
}
}
return TRUE;
}
/******************************************************************************
* *
* Function: init_discovery_request *
* *
* Purpose: initialize the discovery_request structure *
* *
* Parameters: request - [OUT] pointer to the structure *
* lld_key_macro - [IN] lld_macro assigned to indexes *
* lld_remkey_macro - [IN] lld_macro assigned to remote indexes *
* lld_optvalue_macro - [IN] lld_macro assigned to option values *
* opt_func - [IN] function poiner for process *
* option values *
* object_num - [IN] number of oids to retrieve *
* *
******************************************************************************/
static void init_discovery_request(lldpmod_discovery_request_t *request,
const char *lld_key_macro, const char *lld_remkey_macro,
const char *lld_optvalue_macro, lldpmod_optproc_func opt_func, int object_num)
{
request->noid = 0;
request->noid_rem = 0;
request->noid_max = object_num;
request->lld_key_macro = (char *)lld_key_macro;
request->lld_remkey_macro = (char *)lld_remkey_macro;
request->lld_optvalue_macro = (char *)lld_optvalue_macro;
request->opt_func = opt_func;
request->rem_map = NULL;
request->key_types = NULL;
request->res_types = NULL;
request->dump_flags = NULL;
request->oids = NULL;
request->lld_value_macros = NULL;
/* memory allocation */
request->rem_map = (int *)zbx_malloc(request->rem_map, object_num * sizeof(int));
request->key_types = (int *)zbx_malloc(request->key_types, object_num * sizeof(int));
request->res_types = (int *)zbx_malloc(request->res_types, object_num * sizeof(int));
request->dump_flags = (int *)zbx_malloc(request->dump_flags, object_num * sizeof(int));
request->oids = (char **)zbx_malloc(request->oids, object_num * sizeof(char *));
request->lld_value_macros = (char **)zbx_malloc(request->lld_value_macros, object_num * sizeof(char *));
}
/******************************************************************************
* *
* Function: free_discovery_request *
* *
* Purpose: free memory used by the discovery_request *
* *
* Parameters: request - pointer to the discovery_request structure *
* *
******************************************************************************/
static void free_discovery_request(lldpmod_discovery_request_t *request)
{
request->noid = 0;
request->noid_rem = 0;
request->noid_max = 0;
/* strings in the request array such as */
/* request->oids[i], request->lld_value_macros[i] */
/* are pointers to constants, so do not free. only array free. */
zbx_free(request->rem_map);
zbx_free(request->key_types);
zbx_free(request->res_types);
zbx_free(request->dump_flags);
zbx_free(request->oids);
zbx_free(request->lld_value_macros);
}
/******************************************************************************
* *
* Function: add_discovery_request *
* *
* Purpose: add a new parameter *
* *
* Parameters: request - [OUT] pointer to the request structure *
* key_type - [IN] KEY_TYPE_LOC or KEY_TYPE_REM *
* res_type - [IN] only RES_TYPE_STR for discovery *
* dump_flag - [IN] DUMP_NORMAL(space) or *
* DUMP_WITH_MAC(coron) *
* oid - [IN] oid to retrieve *
* lld_value_macro - [IN] lld macro collesponding to oid's value *
* *
******************************************************************************/
static void add_discovery_request(lldpmod_discovery_request_t *request,
int key_type, int res_type, int dump_flag, char *oid, char *lld_value_macro)
{
if (request->noid >= request->noid_max)
return;
request->noid++;
if (KEY_TYPE_REM == key_type)
{
request->noid_rem++;
request->rem_map[request->noid - 1] = request->noid_rem - 1;
}
else
{
request->rem_map[request->noid - 1] = request->noid - request->noid_rem - 1;
}
request->res_types[request->noid - 1] = res_type;
request->key_types[request->noid - 1] = key_type;
request->dump_flags[request->noid - 1] = dump_flag;
request->oids[request->noid - 1] = oid;
request->lld_value_macros[request->noid - 1] = lld_value_macro;
}
/******************************************************************************
* *
* Function: lldpmod_get_snmp_type_error *
* *
* Purpose: convert snmp type to string *
* *
* Parameters: type - snmp type *
* *
* Return value: string collesponding to snmp type *
* *
******************************************************************************/
static char *lldpmod_get_snmp_type_error(u_char type)
{
switch (type)
{
case SNMP_NOSUCHOBJECT:
return zbx_strdup(NULL, "No Such Object available on this agent at this OID");
case SNMP_NOSUCHINSTANCE:
return zbx_strdup(NULL, "No Such Instance currently exists at this OID");
case SNMP_ENDOFMIBVIEW:
return zbx_strdup(NULL, "No more variables left in this MIB View"
" (it is past the end of the MIB tree)");
default:
return zbx_dsprintf(NULL, "Value has unknown type 0x%02X", (unsigned int)type);
}
}
/******************************************************************************
* *
* Function: lldpmod_get_snmp_response_error *
* *
* Purpose: convert snmp code to string *
* *
* Parameters: ss - [IN] snmp session *
* status - [IN] snmp status code *
* resoponse - [IN] snmp_response structure *
* error - [OUT] error message buffer *
* error_len - [IN] buffer length *
* *
* Return value: item return code *
* *
******************************************************************************/
static int lldpmod_get_snmp_response_error(const struct snmp_session *ss, int status,
const struct snmp_pdu *response, char *error, size_t max_error_len)
{
int ret;
/* error in response */
if (STAT_SUCCESS == status)
{
zbx_snprintf(error, max_error_len, "SNMP error: %s", snmp_errstring(response->errstat));
ret = NOTSUPPORTED;
}
else if (STAT_ERROR == status)
{
zbx_snprintf(error, max_error_len, "Cannot connect to \"%s\": %s.", ss->peername, snmp_api_errstring(ss->s_snmp_errno));
ret = NETWORK_ERROR;
}
else if (STAT_TIMEOUT == status)
{
zbx_snprintf(error, max_error_len, "Timeout while connecting to \"%s\".", ss->peername);
ret = NETWORK_ERROR;
}
else
{
zbx_snprintf(error, max_error_len, "SNMP error: [%d]", status);
ret = NOTSUPPORTED;
}
return ret;
}
/******************************************************************************
* *
* Function: lldpmod_snmp_open_session *
* *
* Purpose: open snmp session *
* *
* Parameters: IP - [IN] IP address of monitoring object *
* community - [IN] snmp community name *
* error - [OUT] error message buffer *
* error_len - [IN] buffer length *
* *
* Return value: item return code *
* *
******************************************************************************/
static netsnmp_session *lldpmod_snmp_open_session(const char *IP, const char *community, char *error, size_t max_error_len)
{
netsnmp_session session, *ss = NULL;
snmp_sess_init(&session);
session.version = SNMP_VERSION_2c;
session.timeout = item_timeout * 1000 * 1000; /* timeout of one attempt in microseconds */
/* (net-snmp default = 1 second) */
session.retries = 0;
session.peername = (char *)IP;
session.community = (u_char *)community;
session.community_len = strlen((char *)session.community);
SOCK_STARTUP;
if (NULL == (ss = snmp_open(&session)))
{
SOCK_CLEANUP;
zbx_strlcpy(error, "Cannot open SNMP session", max_error_len);
}
return ss;
}
/******************************************************************************
* *
* Function: lldpmod_snmp_close_session *
* *
* Purpose: close snmp session *
* *
* Parameters: session - [IN] snmp session *
* *
******************************************************************************/
static void lldpmod_snmp_close_session(netsnmp_session *session)
{
snmp_close(session);
SOCK_CLEANUP;
}
/******************************************************************************
* *
* Function: lldpmod_get_octet_string *
* *
* Purpose: copy snmp string to buffer *
* *
* Parameters: var - [IN] snmp variable_list *
* *
* Return value: pointer to string *
* *
******************************************************************************/
static char *lldpmod_get_octet_string(const struct variable_list *var)
{
const char *hint;
char buffer[MAX_STRING_LEN];
char *strval_dyn = NULL;
struct tree *subtree;
/* find the subtree to get display hint */
subtree = get_tree(var->name, var->name_length, get_tree_head());
hint = (NULL != subtree ? subtree->hint : NULL);
/* we will decide if we want the value from var->val or what snprint_value() returned later */
if (-1 == snprint_value(buffer, sizeof(buffer), var->name, var->name_length, var))
goto end;
if (0 == strncmp(buffer, "Hex-STRING: ", 12))
{
strval_dyn = zbx_strdup(strval_dyn, buffer + 12);
}
else if (NULL != hint && 0 == strncmp(buffer, "STRING: ", 8))
{
strval_dyn = zbx_strdup(strval_dyn, buffer + 8);
}
else if (0 == strncmp(buffer, "OID: ", 5))
{
strval_dyn = zbx_strdup(strval_dyn, buffer + 5);
}
else if (0 == strncmp(buffer, "BITS: ", 6))
{
strval_dyn = zbx_strdup(strval_dyn, buffer + 6);
}
else
{
/* snprint_value() escapes hintless ASCII strings, so */
/* we are copying the raw unescaped value in this case */
strval_dyn = (char *)zbx_malloc(strval_dyn, var->val_len + 1);
memcpy(strval_dyn, var->val.string, var->val_len);
strval_dyn[var->val_len] = '\0';
}
end:
return strval_dyn;
}
/******************************************************************************
* *
* Function: lldpmod_snmp_set_result *
* *
* Purpose: set snmp result to zabbix agent_result *
* *
* Parameters: var - [IN] snmp variable_list *
* result - [OUT] zabbix agent_result *
* res_type - [IN] RES_TYPE_STR or RES_TYPE_BSTR or RES_TYPE_INT *
* dump_flag - [IN] DUMP_NORMAL(space) or DUMP_WITH_MAC(coron) *
* *
* Return value: item return code *
* *
******************************************************************************/
static int lldpmod_snmp_set_result(const struct variable_list *var, AGENT_RESULT *result, int res_type, int dump_flag)
{
char *strval_dyn = NULL;
int ret = SUCCEED;
if (res_type == RES_TYPE_BSTR)
{
/* if RES_TYPE_BSTR, use lldpmod_get_octet_string */
if (NULL == (strval_dyn = lldpmod_get_octet_string(var)))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot receive string value: out of memory."));
ret = NOTSUPPORTED;
}
else
{
zbx_replace_invalid_utf8(strval_dyn);
SET_TEXT_RESULT(result, zbx_strdup(NULL, strval_dyn));
zbx_free(strval_dyn);
}
}
else if (ASN_OCTET_STR == var->type || ASN_OBJECT_ID == var->type)
{
/* if other res_type, and ASN_OCTET_STR or ASN_OBJECT_ID */
if (isasciistr(var->val.string, var->val_len))
{
/* if ascii string, simply copy strings */
if (NULL == (strval_dyn = (char *)zbx_malloc(strval_dyn, 1 + var->val_len)))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot receive string value: out of memory."));
ret = NOTSUPPORTED;
}
else
{
memcpy(strval_dyn, var->val.string, var->val_len);
strval_dyn[var->val_len] = '\0';
zbx_replace_invalid_utf8(strval_dyn);
SET_TEXT_RESULT(result, zbx_strdup(NULL, strval_dyn));
zbx_free(strval_dyn);
}
}
else
{
/* in other case, dump binaries */
if (NULL == (strval_dyn = (char *)zbx_malloc(strval_dyn, 3 * (var->val_len) + 1)))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot receive string value: out of memory."));
ret = NOTSUPPORTED;
}
else
{
char separator;
if (DUMP_WITH_MAC == dump_flag)
separator = ':';
else
separator = ' ';
dump(separator, (const unsigned char *)var->val.string, var->val_len, strval_dyn);
zbx_replace_invalid_utf8(strval_dyn);
SET_TEXT_RESULT(result, zbx_strdup(NULL, strval_dyn));
zbx_free(strval_dyn);
}
}
}
#ifdef OPAQUE_SPECIAL_TYPES
else if (ASN_UINTEGER == var->type || ASN_COUNTER == var->type || ASN_OPAQUE_U64 == var->type ||
ASN_TIMETICKS == var->type || ASN_GAUGE == var->type)
#else
else if (ASN_UINTEGER == var->type || ASN_COUNTER == var->type ||
ASN_TIMETICKS == var->type || ASN_GAUGE == var->type)
#endif
{
SET_UI64_RESULT(result, (unsigned long)*var->val.integer);
}
#ifdef OPAQUE_SPECIAL_TYPES
else if (ASN_COUNTER64 == var->type || ASN_OPAQUE_COUNTER64 == var->type)
#else
else if (ASN_COUNTER64 == var->type)
#endif
{
SET_UI64_RESULT(result, (((zbx_uint64_t)var->val.counter64->high) << 32) +
(zbx_uint64_t)var->val.counter64->low);
}
#ifdef OPAQUE_SPECIAL_TYPES
else if (ASN_INTEGER == var->type || ASN_OPAQUE_I64 == var->type)
#else
else if (ASN_INTEGER == var->type)
#endif
{
char buffer[21];
zbx_snprintf(buffer, sizeof(buffer), "%ld", *var->val.integer);
zbx_replace_invalid_utf8(buffer);
SET_TEXT_RESULT(result, zbx_strdup(NULL, buffer));
}
#ifdef OPAQUE_SPECIAL_TYPES
else if (ASN_OPAQUE_FLOAT == var->type)
{
SET_DBL_RESULT(result, *var->val.floatVal);
}
else if (ASN_OPAQUE_DOUBLE == var->type)
{
SET_DBL_RESULT(result, *var->val.doubleVal);
}
#endif
else if (ASN_IPADDRESS == var->type)
{
SET_STR_RESULT(result, zbx_dsprintf(NULL, "%u.%u.%u.%u",
(unsigned int)var->val.string[0],
(unsigned int)var->val.string[1],
(unsigned int)var->val.string[2],
(unsigned int)var->val.string[3]));
}
else
{
SET_MSG_RESULT(result, lldpmod_get_snmp_type_error(var->type));
ret = NOTSUPPORTED;
}
return ret;
}
/******************************************************************************
* *
* Function: lldpmod_snmp_object_hash *
* *
* Purpose: return hash value for snmp oid *
* *
* Parameters: data - [IN] target oid *
* *
* Return value: hash value *
* *
******************************************************************************/
static zbx_hash_t lldpmod_snmp_object_hash(const void *data)
{
const oid *key = (const oid *)data;
#ifdef ZBX_DEFAULT_HASH_ALGO
return ZBX_DEFAULT_HASH_ALGO(key, sizeof(oid), ZBX_DEFAULT_HASH_SEED);
#else /* ZBX_DEFAULT_UINT64_HASH_ALGO (Zabbix2.x) */
return ZBX_DEFAULT_UINT64_HASH_ALGO(key, sizeof(oid), ZBX_DEFAULT_HASH_SEED);
#endif
}
/******************************************************************************
* *
* Function: lldpmod_snmp_object_compare *
* *
* Purpose: compare funcion for oid *
* *
* Parameters: d1 - [IN] target oid 1 *
* d2 - [IN] target oid 2 *
* *
* Return value: -1 if d1 < d2, 0 if d1 = d2, 1 if d1 > d2 *
* *
******************************************************************************/
static int lldpmod_snmp_object_compare(const void *d1, const void *d2)
{
const oid *k1 = (const oid *)d1;
const oid *k2 = (const oid *)d2;
if (d1 == d2)
return 0;
return snmp_oid_compare(k1, 1, k2, 1);
}
/******************************************************************************
* *
* Function: lldpmod_snmp_data_clean *
* *
* Purpose: releases data allocated by snmp walk or discovery *
* *
* Parameters: data - [IN] snmpwalk data object *
* *
******************************************************************************/
static void lldpmod_snmp_data_clean(lldpmod_discovery_data_t *data)
{
int i;
lldpmod_snmp_object_t *obj;
lldpmod_snmp_object_t *rem_obj;
zbx_hashset_iter_t iter;
zbx_hashset_iter_t rem_iter;
zbx_hashset_iter_reset(&data->objects, &iter);
while (NULL != (obj = (lldpmod_snmp_object_t *)zbx_hashset_iter_next(&iter)))
{
if (NULL != obj->rem_objects)
{
zbx_hashset_iter_reset(obj->rem_objects, &rem_iter);
while (NULL != (rem_obj = (lldpmod_snmp_object_t *)zbx_hashset_iter_next(&rem_iter)))
{
for (i = 0; i < data->request.noid; i++)
{
if (KEY_TYPE_REM == data->request.key_types[i])
zbx_free(rem_obj->values[data->request.rem_map[i]]);
}
zbx_free(rem_obj->values);
}
zbx_hashset_destroy(obj->rem_objects);
zbx_free(obj->rem_objects);
}
for (i = 0; i < data->request.noid; i++)
zbx_free(obj->values[i]);
zbx_free(obj->values);
}
zbx_hashset_destroy(&data->objects);
free_discovery_request(&data->request);
}
/******************************************************************************
* *
* Function: lldpmod_snmpwalk *
* *
* Purpose: get data from monitoring object by snmp-walk *
* *
* Parameters: session - [IN] snmp session *
* OID - target OID of snmp-walk *
* error - [OUT] error message buffer *
* error_len - [IN] buffer length *
* walk_cb_func - [IN] callback function to process walked OIDs *
* and their values *
* walk_cb_arg - [IN] argument to pass to the callback function *
* *
* Return value: item return code *
* *
******************************************************************************/
static int lldpmod_snmpwalk(struct snmp_session *ss, const char *OID, char *error, size_t max_error_len,
lldpmod_snmpwalk_cb_func walk_cb_func, void *walk_cb_arg)
{
netsnmp_pdu *pdu, *response;
oid name[MAX_OID_LEN], root[MAX_OID_LEN];
size_t name_len = MAX_OID_LEN, root_len = MAX_OID_LEN;
netsnmp_variable_list *var;
int status, running, ret = SUCCEED;
/* create OID from string */
if (NULL == snmp_parse_oid(OID, root, &root_len))
{
zbx_snprintf(error, max_error_len, "snmp_parse_oid(): cannot parse OID \"%s\".", OID);
ret = CONFIG_ERROR;
goto out;
}
/* copy root to name */
memcpy(name, root, root_len * sizeof(oid));
name_len = root_len;
/* initialize variables */
running = 1;
while (running)
{
if (NULL == (pdu = snmp_pdu_create(SNMP_MSG_GETNEXT)))
{
zbx_strlcpy(error, "snmp_pdu_create(): cannot create PDU object.", max_error_len);
ret = NOTSUPPORTED;
break;
}
if (NULL == snmp_add_null_var(pdu, name, name_len)) /* add OID as variable to PDU */
{
zbx_strlcpy(error, "snmp_add_null_var(): cannot add null variable.", max_error_len);
ret = NOTSUPPORTED;
snmp_free_pdu(pdu);
break;
}
status = snmp_synch_response(ss, pdu, &response);
if (STAT_SUCCESS != status || SNMP_ERR_NOERROR != response->errstat)
{
ret = lldpmod_get_snmp_response_error(ss, status, response, error, max_error_len);
running = 0;
goto next;
}
/* check retrieved variables */
for (var = response->variables; var; var = var->next_variable)
{
if (SNMP_ENDOFMIBVIEW == var->type || var->name_length < root_len ||
0 != memcmp(root, var->name, root_len * sizeof(oid)))
{
/* not part of this subtree */
running = 0;
break;
}
else if (SNMP_NOSUCHOBJECT != var->type && SNMP_NOSUCHINSTANCE != var->type)
{
/* callback functions */
if (SUCCEED != (ret = walk_cb_func(walk_cb_arg, var)))
{
running = 0;
break;
}
/* get next */
memcpy((char *)name, (char *)var->name, var->name_length * sizeof(oid));
name_len = var->name_length;
}
else
{
/* an exception value, so stop */
char *errmsg;
errmsg = lldpmod_get_snmp_type_error(var->type);
zbx_strlcpy(error, errmsg, max_error_len);
zbx_free(errmsg);
ret = NOTSUPPORTED;
running = 0;
break;
}
} /* for (var = response->variables; var; var = var->next_variable) */
next:
if (NULL != response)
snmp_free_pdu(response);
} /* while (running) */
out:
return ret;
}
/******************************************************************************
* *
* Function: lldpmod_snmpwalk_getrem_cb *
* *
* Purpose: callback function pass to lldpmod_snmpwalk to get a remote object *
* walk remote objects ignore timemark while checking index and *
* remote index *
* *
* Parameters: arg - [IN/OUT] condition and result *
* var - [IN] snmp variable_list *
* *
* Return value: SUCCEED_WITH_VALUE - succeed and found a remote object *
* SUCCEED - no error occured but not found any remote object *
* other item return code - error occured *
* *
******************************************************************************/
int lldpmod_snmpwalk_getrem_cb(void *arg, const netsnmp_variable_list *var)
{
lldpmod_getrem_data_t *getrem_data = (lldpmod_getrem_data_t *)arg;
int ret = SUCCEED;
int err = SUCCEED;
if ( var->name_length > 1 &&
getrem_data->index == var->name[var->name_length - 2] &&
getrem_data->rem_index == var->name[var->name_length - 1])
{
if (SUCCEED != (err = lldpmod_snmp_set_result(var, getrem_data->result, getrem_data->res_type, getrem_data->dump_flag)))
{
char **msg;
msg = GET_MSG_RESULT(getrem_data->result);
zabbix_log(LOG_LEVEL_DEBUG, "%s: cannot get index='%lu', rem_index='%lu' value: %s", MODULE_NAME,
(unsigned long)getrem_data->index, (unsigned long)getrem_data->rem_index, NULL != msg && NULL != *msg ? *msg : "(null)");
}
if (SUCCEED == err)
ret = SUCCEED_WITH_VALUE;
else
ret = err;
}
return ret;
}
/******************************************************************************
* *
* Function: lldpmod_snmpwalk_discovery_cb *
* *
* Purpose: callback function pass to lldpmod_snmpwalk to discovery items *
* walk and collect objects with index as key to output lld rules *
* *
* Parameters: arg - [IN/OUT] request and result *
* var - [IN] snmp variable_list *
* *
* Return value: item return code *
* *
******************************************************************************/
int lldpmod_snmpwalk_discovery_cb(void *arg, const netsnmp_variable_list *var)
{
lldpmod_discovery_data_t *data = (lldpmod_discovery_data_t *)arg;
AGENT_RESULT snmp_result;
lldpmod_snmp_object_t *obj;
lldpmod_snmp_object_t *rem_obj;
oid index;
oid rem_index;
int ret = SUCCEED;
if (data->request.key_types[data->num] == KEY_TYPE_LOC && var->name_length > 0)
index = var->name[var->name_length - 1];
else if (var->name_length > 1) /* KEY_TYPE_REM */
{
index = var->name[var->name_length - 2];
rem_index = var->name[var->name_length - 1];
}
else
{
return ret;
}
init_result(&snmp_result);
if (SUCCEED == lldpmod_snmp_set_result(var, &snmp_result, data->request.res_types[data->num], data->request.dump_flags[data->num]) &&
NULL != GET_STR_RESULT(&snmp_result))
{
if (NULL == (obj = (lldpmod_snmp_object_t *)zbx_hashset_search(&data->objects, &index)))
{
/* if index not found, create new hash */
lldpmod_snmp_object_t new_obj;
new_obj.index = index;
new_obj.values = (char **)zbx_malloc(NULL, sizeof(char *) * data->request.noid);
memset(new_obj.values, 0, sizeof(char *) * data->request.noid);
new_obj.rem_objects = NULL;
obj = (lldpmod_snmp_object_t *)zbx_hashset_insert(&data->objects, &new_obj, sizeof(new_obj));
}
if (NULL != obj)
{
if (data->request.key_types[data->num] == KEY_TYPE_REM)
{
/* if remote object and rem_index not found, create new hash */
if (NULL == obj->rem_objects || NULL == (rem_obj = (lldpmod_snmp_object_t *)zbx_hashset_search(obj->rem_objects, &rem_index)))
{
if (NULL == obj->rem_objects)
{
obj->rem_objects = (zbx_hashset_t *)zbx_malloc(NULL, sizeof(zbx_hashset_t));
zbx_hashset_create(obj->rem_objects, 10, lldpmod_snmp_object_hash, lldpmod_snmp_object_compare);
}
lldpmod_snmp_object_t new_rem_obj;
new_rem_obj.index = rem_index;
new_rem_obj.values = (char **)zbx_malloc(NULL, sizeof(char *) * data->request.noid_rem);
memset(new_rem_obj.values, 0, sizeof(char *) * data->request.noid_rem);
new_rem_obj.rem_objects = NULL;
rem_obj = (lldpmod_snmp_object_t *)zbx_hashset_insert(obj->rem_objects, &new_rem_obj, sizeof(new_rem_obj));
}
if (NULL != rem_obj->values[data->request.rem_map[data->num]])
{
zabbix_log(LOG_LEVEL_WARNING, "%s: the same index appears again. oid='%s',index=%lu, rem_index=%lu, oldvalue='%s', newvalue='%s'",
MODULE_NAME,
data->request.oids[data->num],
(unsigned long)index, (unsigned long)rem_index,
rem_obj->values[data->request.rem_map[data->num]],
snmp_result.str);
zbx_free(rem_obj->values[data->request.rem_map[data->num]]);
}
rem_obj->values[data->request.rem_map[data->num]] = zbx_strdup(NULL, snmp_result.str);
}
else /* KEY_TYPE_LOC */
{
if (NULL != obj->values[data->num])
{
zabbix_log(LOG_LEVEL_WARNING, "%s: the same index appears again. oid='%s',index=%lu, oldvalue='%s', newvalue='%s'",
MODULE_NAME,
data->request.oids[data->num],
(unsigned long)index,
obj->values[data->num],
snmp_result.str);
zbx_free(obj->values[data->num]);
}
obj->values[data->num] = zbx_strdup(NULL, snmp_result.str);
}
}
}
else
{
char **msg;
msg = GET_MSG_RESULT(&snmp_result);
if (data->request.key_types[data->num] == KEY_TYPE_LOC)
zabbix_log(LOG_LEVEL_DEBUG, "%s: cannot get index '%lu' string value: %s", MODULE_NAME,
(unsigned long)index, NULL != msg && NULL != *msg ? *msg : "(null)");
else
zabbix_log(LOG_LEVEL_DEBUG, "%s: cannot get index '%lu.%lu' string value: %s", MODULE_NAME,
(unsigned long)index, (unsigned long)rem_index, NULL != msg && NULL != *msg ? *msg : "(null)");
}
free_result(&snmp_result);
return ret;
}
/******************************************************************************
* *
* Function: lldpmod_lldp_discovery *
* *
* Purpose: a main entry point for item discovery *
* *
* Parameters: request - structure that contains item key and parameters *
* request->key - item key without parameters *
* request->nparam - number of parameters *
* request->timeout - processing should not take longer than *
* this number of seconds *
* request->params[N-1] - pointers to item key parameters *
* *
* result - structure that will contain result *
* *
* Return value: SYSINFO_RET_FAIL - function failed, item will be marked *
* as not supported by zabbix *
* SYSINFO_RET_OK - success *
* *
* Comment: get_rparam(request, N-1) can be used to get a pointer to the Nth *
* parameter starting from 0 (first parameter). Make sure it exists *
* by checking value of request->nparam. *
* *
******************************************************************************/
int lldpmod_lldp_discovery(AGENT_REQUEST *request, AGENT_RESULT *result)
{
netsnmp_session *ss;
char error[MAX_STRING_LEN];
int ret = SYSINFO_RET_OK;
int err = SUCCEED;
char *param_ip, *param_community, *param_func;
struct zbx_json js;
int i;
lldpmod_discovery_data_t data;
lldpmod_snmp_object_t *obj;
lldpmod_snmp_object_t *rem_obj;
zbx_hashset_iter_t iter;
zbx_hashset_iter_t rem_iter;
char oid_str_buf[MAX_ID_LEN];
if (request->nparam < 3 || request->nparam > 3)
{
SET_MSG_RESULT(result, strdup("Invalid number of parameters"));
return SYSINFO_RET_FAIL;
}
param_ip = get_rparam(request, 0);
param_community = get_rparam(request, 1);
param_func = get_rparam(request, 2);
if (NULL == param_ip || '\0' == *param_ip)
{
SET_MSG_RESULT(result, strdup("Invalid format of 1st parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL == param_community || '\0' == *param_community)
{
SET_MSG_RESULT(result, strdup("Invalid format of 2nd parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL == param_func || '\0' == *param_func
|| ((0 != strcmp(param_func, "local"))
&& (0 != strcmp(param_func, "remote"))
&& (0 != strcmp(param_func, "interface"))))
{
SET_MSG_RESULT(result, strdup("Invalid format of 3rd parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL == (ss = lldpmod_snmp_open_session(param_ip, param_community, error, sizeof(error))))
{
err = NETWORK_ERROR;
goto out;
}
zbx_hashset_create(&data.objects, 10, lldpmod_snmp_object_hash, lldpmod_snmp_object_compare);
/* setup request parameter */
if (0 == strcmp(param_func, "local"))
{
init_discovery_request(&data.request, LLD_MACRO_PORT_INDEX, NULL, NULL, NULL, 1);
add_discovery_request(&data.request, KEY_TYPE_LOC, RES_TYPE_STR, DUMP_WITH_MAC, LOC_PORTID_OID, LLD_MACRO_PORT_NAME);
}
else if (0 == strcmp(param_func, "remote"))
{
init_discovery_request(&data.request, LLD_MACRO_PORT_INDEX, LLD_MACRO_REM_INDEX, NULL, NULL, 2);
add_discovery_request(&data.request, KEY_TYPE_LOC, RES_TYPE_STR, DUMP_WITH_MAC, LOC_PORTID_OID, LLD_MACRO_PORT_NAME);
add_discovery_request(&data.request, KEY_TYPE_REM, RES_TYPE_STR, DUMP_WITH_MAC, REM_PORTID_OID, NULL);
}
else /* if (0 == strcmp(param_func, "interface")) */
{
init_discovery_request(&data.request, LLD_MACRO_PORT_INDEX, NULL, LLD_MACRO_PORT_IDENTIFIER, get_if_idx, 3);
add_discovery_request(&data.request, KEY_TYPE_LOC, RES_TYPE_STR, DUMP_NORMAL, IF_OID, LLD_MACRO_PORT_NAME);
add_discovery_request(&data.request, KEY_TYPE_LOC, RES_TYPE_STR, DUMP_NORMAL, IF_DESC_OID, LLD_MACRO_PORT_DESC);
add_discovery_request(&data.request, KEY_TYPE_LOC, RES_TYPE_STR, DUMP_NORMAL, IF_TYPE_OID, LLD_MACRO_IF_TYPE);
}
/* call net-snmp library */
for (data.num = 0; data.num < data.request.noid; data.num++)
{
if (SUCCEED != (err = lldpmod_snmpwalk(ss, data.request.oids[data.num], error, sizeof(error), lldpmod_snmpwalk_discovery_cb, &data)))
{
zabbix_log(LOG_LEVEL_WARNING, "%s: %s", MODULE_NAME, error);
goto clean;
}
}
/* make lld rules json from retrieved result */
zbx_json_init(&js, ZBX_JSON_STAT_BUF_LEN);
zbx_json_addarray(&js, ZBX_PROTO_TAG_DATA);
zbx_hashset_iter_reset(&data.objects, &iter);
while (NULL != (obj = (lldpmod_snmp_object_t *)zbx_hashset_iter_next(&iter)))
{
if (0 == strcmp(param_func, "remote"))
{
/* lldp remote objects */
if (NULL == obj->rem_objects || 0 == obj->rem_objects->num_data)
{
/* port that can't get remote information */
zbx_json_addobject(&js, NULL);
zbx_snprintf(oid_str_buf, sizeof(oid_str_buf), "%lu", (unsigned long)obj->index);
zbx_json_addstring(&js, data.request.lld_key_macro, oid_str_buf, ZBX_JSON_TYPE_STRING);
zbx_json_addstring(&js, data.request.lld_remkey_macro, "0", ZBX_JSON_TYPE_STRING);
for (i = 0; i < data.request.noid; i++)
{
if (NULL != obj->values[i] && NULL != data.request.lld_value_macros[i])
zbx_json_addstring(&js, data.request.lld_value_macros[i], obj->values[i], ZBX_JSON_TYPE_STRING);
}
zbx_json_close(&js);
}
else
{
/* port that can get remote information */
zbx_hashset_iter_reset(obj->rem_objects, &rem_iter);
while (NULL != (rem_obj = (lldpmod_snmp_object_t *)zbx_hashset_iter_next(&rem_iter)))
{
zbx_json_addobject(&js, NULL);
zbx_snprintf(oid_str_buf, sizeof(oid_str_buf), "%lu", (unsigned long)obj->index);
zbx_json_addstring(&js, data.request.lld_key_macro, oid_str_buf, ZBX_JSON_TYPE_STRING);
zbx_snprintf(oid_str_buf, sizeof(oid_str_buf), "%lu", (unsigned long)rem_obj->index);
zbx_json_addstring(&js, data.request.lld_remkey_macro, oid_str_buf, ZBX_JSON_TYPE_STRING);
for (i = 0; i < data.request.noid; i++)
{
if (KEY_TYPE_LOC == data.request.key_types[i])
{
if (NULL != obj->values[i] && NULL != data.request.lld_value_macros[i])
zbx_json_addstring(&js, data.request.lld_value_macros[i], obj->values[i], ZBX_JSON_TYPE_STRING);
}
else
{
if (NULL != rem_obj->values[data.request.rem_map[i]] && NULL != data.request.lld_value_macros[i])
zbx_json_addstring(&js, data.request.lld_value_macros[i], rem_obj->values[data.request.rem_map[i]], ZBX_JSON_TYPE_STRING);
}
}
zbx_json_close(&js);
}
}
}
else
{
/* lldp local objects or interface objects */
zbx_json_addobject(&js, NULL);
zbx_snprintf(oid_str_buf, sizeof(oid_str_buf), "%lu", (unsigned long)obj->index);
zbx_json_addstring(&js, data.request.lld_key_macro, oid_str_buf, ZBX_JSON_TYPE_STRING);
if (NULL != data.request.lld_optvalue_macro && NULL != data.request.opt_func)
{
data.request.opt_func(&obj->index, oid_str_buf, sizeof(oid_str_buf));
zbx_json_addstring(&js, data.request.lld_optvalue_macro, oid_str_buf, ZBX_JSON_TYPE_STRING);
}
for (i = 0; i < data.request.noid; i++)
{
if (NULL != obj->values[i] && NULL != data.request.lld_value_macros[i])
zbx_json_addstring(&js, data.request.lld_value_macros[i], obj->values[i], ZBX_JSON_TYPE_STRING);
}
zbx_json_close(&js);
}
}
zbx_json_close(&js);
/* make lld rules end */
SET_TEXT_RESULT(result, zbx_strdup(NULL, js.buffer));
zbx_json_free(&js);
clean:
lldpmod_snmp_close_session(ss);
lldpmod_snmp_data_clean(&data);
out:
if (SUCCEED != err)
{
SET_MSG_RESULT(result, zbx_strdup(NULL, error));
ret = SYSINFO_RET_FAIL;
}
return ret;
}
/******************************************************************************
* *
* Function: lldpmod_getrem_common *
* *
* Purpose: common function of get specific remote object *
* each caller functions pass oid, dump_flag, res_type *
* *
* Parameters: request - structure that contains item key and parameters *
* request->key - item key without parameters *
* request->nparam - number of parameters *
* request->timeout - processing should not take longer than *
* this number of seconds *
* request->params[N-1] - pointers to item key parameters *
* *
* result - structure that will contain result *
* get_mib - target mib *
* getrem_data - structure that contains parameter *
* getrem_data->dump_flag - DUMP_NORMAL(space) or *
* DUMP_WITH_MAC(coron) *
* getrem_data->res_type - RES_TYPE_STR or RES_TYPE_BSTR or *
* RES_TYPE_INT *
* *
* Return value: SYSINFO_RET_FAIL - function failed, item will be marked *
* as not supported by zabbix *
* SYSINFO_RET_OK - success *
* *
* Comment: get_rparam(request, N-1) can be used to get a pointer to the Nth *
* parameter starting from 0 (first parameter). Make sure it exists *
* by checking value of request->nparam. *
* *
******************************************************************************/
int lldpmod_getrem_common(AGENT_REQUEST *request, AGENT_RESULT *result, const char *get_mib, lldpmod_getrem_data_t *getrem_data)
{
netsnmp_session *ss;
char error[MAX_STRING_LEN];
int ret = SYSINFO_RET_OK;
int err = SUCCEED;
char *param_ip, *param_community, *param_port_num, *param_rem_idx, *param_def_val;
if (request->nparam < 4 || request->nparam > 5)
{
SET_MSG_RESULT(result, strdup("Invalid number of parameters"));
return SYSINFO_RET_FAIL;
}
param_ip = get_rparam(request, 0);
param_community = get_rparam(request, 1);
param_port_num = get_rparam(request, 2);
param_rem_idx = get_rparam(request, 3);
param_def_val = get_rparam(request, 4);
if (NULL == param_ip || '\0' == *param_ip)
{
SET_MSG_RESULT(result, strdup("Invalid format of 1st parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL == param_community || '\0' == *param_community)
{
SET_MSG_RESULT(result, strdup("Invalid format of 2nd parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL == param_port_num || '\0' == *param_port_num)
{
SET_MSG_RESULT(result, strdup("Invalid format of 3rd parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL == param_rem_idx || '\0' == *param_rem_idx)
{
SET_MSG_RESULT(result, strdup("Invalid format of 4th parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL != param_def_val &&
( (strlen(param_def_val) == 1) ||
(strlen(param_def_val) > 1 && param_def_val[0] != '{' && param_def_val[1] != '$')))
{
/* when default value was specified, return exact same string */
/* don't perform snmp-walk */
SET_TEXT_RESULT(result, strdup(param_def_val));
goto out;
}
if (0 == atol(param_rem_idx))
{
/* when remote index is 0, remote device is not connected */
/* don't perform snmp-walk */
if (RES_TYPE_STR == getrem_data->res_type)
SET_TEXT_RESULT(result, strdup(NC_STRVAL));
else /* RES_TYPE_STR or RES_TYPE_BSTR */
SET_TEXT_RESULT(result, strdup(NC_INTVAL));
goto out;
}
if (NULL == (ss = lldpmod_snmp_open_session(param_ip, param_community, error, sizeof(error))))
{
err = NETWORK_ERROR;
goto exit;
}
getrem_data->index = (oid)strtoul(param_port_num, NULL, 0);
getrem_data->rem_index = (oid)strtoul(param_rem_idx, NULL, 0);
getrem_data->result = result;
/* call net-snmp library */
err = lldpmod_snmpwalk(ss, get_mib, error, sizeof(error), lldpmod_snmpwalk_getrem_cb, getrem_data);
lldpmod_snmp_close_session(ss);
exit:
if (SUCCEED_WITH_VALUE != err)
{
if (SUCCEED == err)
{
/* specified remote index was not found */
SET_MSG_RESULT(result, zbx_dsprintf(NULL, "Object not found. [ %s, %lu, %lu ]",
get_mib, (unsigned long)getrem_data->index, (unsigned long)getrem_data->rem_index));
}
else
{
SET_MSG_RESULT(result, zbx_strdup(NULL, error));
}
char **msg;
msg = GET_MSG_RESULT(result);
zabbix_log(LOG_LEVEL_DEBUG, "%s: getting SNMP values failed: %s", MODULE_NAME, NULL != msg && NULL != *msg ? *msg : "(null)");
ret = SYSINFO_RET_FAIL;
}
out:
return ret;
}
/* get rem_portid_subtype */
int lldpmod_getrem_port_type(AGENT_REQUEST *request, AGENT_RESULT *result)
{
lldpmod_getrem_data_t getrem_data;
getrem_data.dump_flag = DUMP_NORMAL;
getrem_data.res_type = RES_TYPE_INT;
return lldpmod_getrem_common(request, result, REM_TYPE_OID, &getrem_data);
}
/* get rem_portid */
int lldpmod_getrem_port_id(AGENT_REQUEST *request, AGENT_RESULT *result)
{
lldpmod_getrem_data_t getrem_data;
getrem_data.dump_flag = DUMP_WITH_MAC;
getrem_data.res_type = RES_TYPE_STR;
return lldpmod_getrem_common(request, result, REM_PORTID_OID, &getrem_data);
}
/* get rem_port_description */
int lldpmod_getrem_port_desc(AGENT_REQUEST *request, AGENT_RESULT *result)
{
lldpmod_getrem_data_t getrem_data;
getrem_data.dump_flag = DUMP_NORMAL;
getrem_data.res_type = RES_TYPE_STR;
return lldpmod_getrem_common(request, result, REM_PORTDESC_OID, &getrem_data);
}
/* get rem_sysname */
int lldpmod_getrem_sysname(AGENT_REQUEST *request, AGENT_RESULT *result)
{
lldpmod_getrem_data_t getrem_data;
getrem_data.dump_flag = DUMP_NORMAL;
getrem_data.res_type = RES_TYPE_STR;
return lldpmod_getrem_common(request, result, REM_SYSNAME_OID, &getrem_data);
}
/* get rem_sysdescription */
int lldpmod_getrem_sys_desc(AGENT_REQUEST *request, AGENT_RESULT *result)
{
lldpmod_getrem_data_t getrem_data;
getrem_data.dump_flag = DUMP_NORMAL;
getrem_data.res_type = RES_TYPE_STR;
return lldpmod_getrem_common(request, result, REM_SYSDESC_OID, &getrem_data);
}
/******************************************************************************
* *
* Function: lldpmod_getrem_oid *
* *
* Purpose: a main entry point for get a lldp remote oid *
* *
* Parameters: request - structure that contains item key and parameters *
* request->key - item key without parameters *
* request->nparam - number of parameters *
* request->timeout - processing should not take longer than *
* this number of seconds *
* request->params[N-1] - pointers to item key parameters *
* *
* result - structure that will contain result *
* *
* Return value: SYSINFO_RET_FAIL - function failed, item will be marked *
* as not supported by zabbix *
* SYSINFO_RET_OK - success *
* *
* Comment: get_rparam(request, N-1) can be used to get a pointer to the Nth *
* parameter starting from 0 (first parameter). Make sure it exists *
* by checking value of request->nparam. *
* *
******************************************************************************/
int lldpmod_getrem_oid(AGENT_REQUEST *request, AGENT_RESULT *result)
{
netsnmp_session *ss;
char error[MAX_STRING_LEN];
int ret = SYSINFO_RET_OK;
int err = SUCCEED;
char *param_ip, *param_community, *param_oid, *param_port_num, *param_rem_idx;
lldpmod_getrem_data_t getrem_data;
oid parsed_param_oid[MAX_OID_LEN];
size_t parsed_param_oid_len = MAX_OID_LEN;
oid parsed_chk_oid[MAX_OID_LEN];
size_t parsed_chk_oid_len = MAX_OID_LEN;
if (request->nparam != 5)
{
SET_MSG_RESULT(result, strdup("Invalid number of parameters"));
return SYSINFO_RET_FAIL;
}
param_ip = get_rparam(request, 0);
param_community = get_rparam(request, 1);
param_oid = get_rparam(request, 2);
param_port_num = get_rparam(request, 3);
param_rem_idx = get_rparam(request, 4);
if (NULL == param_ip || '\0' == *param_ip)
{
SET_MSG_RESULT(result, strdup("Invalid format of 1st parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL == param_community || '\0' == *param_community)
{
SET_MSG_RESULT(result, strdup("Invalid format of 2nd parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL == param_oid || '\0' == *param_oid)
{
SET_MSG_RESULT(result, strdup("Invalid format of 3rd parameter"));
return SYSINFO_RET_FAIL;
}
/* parse oid */
if (NULL == snmp_parse_oid(param_oid, parsed_param_oid, &parsed_param_oid_len))
{
SET_MSG_RESULT(result, zbx_dsprintf(NULL, "snmp_parse_oid(): cannot parse OID \"%s\".",
param_oid));
return SYSINFO_RET_FAIL;
}
#define CHK_OID(__oid, __res_type, __dump_flag) \
if (NULL != snmp_parse_oid(__oid, parsed_chk_oid, &parsed_chk_oid_len)) \
{ \
if (parsed_chk_oid_len == parsed_param_oid_len && \
0 == memcmp(parsed_chk_oid, parsed_param_oid, parsed_param_oid_len * sizeof(oid))) \
{ \
getrem_data.dump_flag = __dump_flag; \
getrem_data.res_type = __res_type; \
goto oidchk_end; \
} \
} \
else \
{ \
SET_MSG_RESULT(result, zbx_dsprintf(NULL, "snmp_parse_oid(): cannot parse OID \"%s\".", \
__oid)); \
return SYSINFO_RET_FAIL; \
}
/* LLDP-MIB::lldpRemChassisIdSubtype */
CHK_OID(REM_CHASSIS_TYPE_OID, RES_TYPE_INT, DUMP_NORMAL);
/* LLDP-MIB::lldpRemChassisId */
CHK_OID(REM_CHASSIS_ID_OID, RES_TYPE_STR, DUMP_WITH_MAC);
/* LLDP-MIB::lldpRemSysCapSupported */
CHK_OID(REM_CAP_SUPPORTED_OID, RES_TYPE_BSTR, DUMP_NORMAL);
/* LLDP-MIB::lldpRemSysCapEnabled */
CHK_OID(REM_CAP_ENABLED_OID, RES_TYPE_BSTR, DUMP_NORMAL);
/* LLDP-MIB::lldpRemPortIdSubtype */
CHK_OID(REM_TYPE_OID, RES_TYPE_INT, DUMP_NORMAL);
/* LLDP-MIB::lldpRemPortId */
CHK_OID(REM_PORTID_OID, RES_TYPE_STR, DUMP_WITH_MAC);
/* LLDP-MIB::lldpRemPortDesc */
CHK_OID(REM_PORTDESC_OID, RES_TYPE_STR, DUMP_NORMAL);
/* LLDP-MIB::lldpRemSysName */
CHK_OID(REM_SYSNAME_OID, RES_TYPE_STR, DUMP_NORMAL);
/* LLDP-MIB::lldpRemSysDesc */
CHK_OID(REM_SYSDESC_OID, RES_TYPE_STR, DUMP_NORMAL);
oidchk_end:
#undef CHK_OID
if (NULL == param_port_num || '\0' == *param_port_num)
{
SET_MSG_RESULT(result, strdup("Invalid format of 4th parameter"));
return SYSINFO_RET_FAIL;
}
if (NULL == param_rem_idx || '\0' == *param_rem_idx)
{
SET_MSG_RESULT(result, strdup("Invalid format of 5th parameter"));
return SYSINFO_RET_FAIL;
}
if (0 == atol(param_rem_idx))
{
/* when remote index is 0, remote device is not connected */
/* don't perform snmp-walk */
if (RES_TYPE_INT == getrem_data.res_type)
SET_TEXT_RESULT(result, strdup(NC_INTVAL));
else /* RES_TYPE_STR or RES_TYPE_BSTR */
SET_TEXT_RESULT(result, strdup(NC_STRVAL));
goto out;
}
if (NULL == (ss = lldpmod_snmp_open_session(param_ip, param_community, error, sizeof(error))))
{
err = NETWORK_ERROR;
goto exit;
}
getrem_data.index = (oid)strtoul(param_port_num, NULL, 0);
getrem_data.rem_index = (oid)strtoul(param_rem_idx, NULL, 0);
getrem_data.result = result;
/* call net-snmp library */
err = lldpmod_snmpwalk(ss, param_oid, error, sizeof(error), lldpmod_snmpwalk_getrem_cb, &getrem_data);
lldpmod_snmp_close_session(ss);
exit:
if (SUCCEED_WITH_VALUE != err)
{
if (SUCCEED == err)
{
/* specified remote index was not found */
SET_MSG_RESULT(result, zbx_dsprintf(NULL, "Object not found. [ %s, %lu, %lu ]",
param_oid, (unsigned long)getrem_data.index, (unsigned long)getrem_data.rem_index));
}
else
{
SET_MSG_RESULT(result, zbx_strdup(NULL, error));
}
char **msg;
msg = GET_MSG_RESULT(result);
zabbix_log(LOG_LEVEL_DEBUG, "%s: getting SNMP values failed: %s", MODULE_NAME, NULL != msg && NULL != *msg ? *msg : "(null)");
ret = SYSINFO_RET_FAIL;
}
out:
return ret;
}
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