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snmp.c
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snmp.c
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/*
ex: set tabstop=4 shiftwidth=4 autoindent:
-------------------------------------------------------------------------
| Copyright (C) 2004-2023 The Cacti Group |
| Copyright (C) 2004-2023 The Cacti Group |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301, USA |
| |
-------------------------------------------------------------------------
| spine: a backend data gatherer for cacti |
-------------------------------------------------------------------------
| This poller would not have been possible without: |
| - Larry Adams (current development and enhancements) |
| - Rivo Nurges (rrd support, mysql poller cache, misc functions) |
| - RTG (core poller code, pthreads, snmp, autoconf examples) |
| - Brady Alleman/Doug Warner (threading ideas, implimentation details) |
-------------------------------------------------------------------------
| - Cacti - http://www.cacti.net/ |
-------------------------------------------------------------------------
*/
#include "common.h"
#include "spine.h"
/* resolve problems in debian */
#ifndef NETSNMP_DS_LIB_DONT_PERSIST_STATE
#define NETSNMP_DS_LIB_DONT_PERSIST_STATE 32
#endif
#define OIDSIZE(p) (sizeof(p)/sizeof(oid))
/*! \fn void snmp_spine_init()
* \brief wrapper function for init_snmp
*
* Initializes snmp for the given application ID
*
*/
void snmp_spine_init(void) {
/* Only do numeric output */
#ifdef NETSNMP_DS_LIB_PRINT_NUMERIC_ENUM
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_PRINT_NUMERIC_ENUM, 1);
#endif
/* Prevent update of the snmpapp.conf file */
#ifdef NETSNMP_DS_LIB_DONT_PERSIST_STATE
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_DONT_PERSIST_STATE, 1);
#endif
/* Prevent update of the snmpapp.conf file */
#ifdef NETSNMP_DS_LIB_DISABLE_PERSISTENT_LOAD
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_DISABLE_PERSISTENT_LOAD, 1);
#endif
#ifdef NETSNMP_DS_LIB_DONT_PRINT_UNITS
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_DONT_PRINT_UNITS, 1);
#endif
setenv("MIBS", "", 1);
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICK_PRINT, 1);
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICKE_PRINT, 1);
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_PRINT_BARE_VALUE, 1);
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_NUMERIC_TIMETICKS, 1);
/* don't check the range of the OID */
netsnmp_ds_toggle_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_DONT_CHECK_RANGE);
#if defined(VERIFY_PACKAGE_VERSION) && defined(PACKAGE_VERSION)
/* check that the headers we compiled with match the library we linked with */
SPINE_LOG_DEBUG(("DEBUG: SNMP Header Version is %s", PACKAGE_VERSION));
SPINE_LOG_DEBUG(("DEBUG: SNMP Library Version is %s", netsnmp_get_version()));
if (STRMATCH(PACKAGE_VERSION,netsnmp_get_version())) {
init_snmp("spine");
} else {
/* report the error and quit spine */
die("ERROR: SNMP Library Version Mismatch (%s vs %s)",PACKAGE_VERSION,netsnmp_get_version());
}
#else
SPINE_LOG_DEBUG(("DEBUG: Issues with SNMP Header Version information, assuming old version of Net-SNMP."));
init_snmp("spine");
#endif
}
/*! \fn void snmp_spine_close()
* \brief wrapper function for the snmp_shutdown function
*
* Closes the snmp api for the given application ID
*
*/
void snmp_spine_close(void) {
snmp_shutdown("spine");
}
/*! \fn void *snmp_host_init(int host_id, char *hostname, int snmp_version,
* char *snmp_community, char *snmp_username, char *snmp_password,
* char *snmp_auth_protocol, char *snmp_priv_passphrase, char *snmp_priv_protocol,
* char *snmp_context, char *snmp_engine_id, int snmp_port, int snmp_timeout)
* \brief initializes an snmp_session object for a Spine host
*
* This function will initialize NET-SNMP for the Spine host
* in question.
*
*/
void *snmp_host_init(int host_id, char *hostname, int snmp_version, char *snmp_community,
char *snmp_username, char *snmp_password, char *snmp_auth_protocol,
char *snmp_priv_passphrase, char *snmp_priv_protocol,
char *snmp_context, char *snmp_engine_id, int snmp_port, int snmp_timeout) {
void *sessp = NULL;
struct snmp_session session;
char hostnameport[BUFSIZE];
/* initialize SNMP */
snmp_sess_init(&session);
/* Bind to snmp_clientaddr if specified */
size_t len = strlen(set.snmp_clientaddr);
if (len > 0 && len <= SMALL_BUFSIZE) {
#if SNMP_LOCALNAME == 1
session.localname = strdup(set.snmp_clientaddr);
#endif
}
/* Prevent update of the snmpapp.conf file */
#ifdef NETSNMP_DS_LIB_DONT_PERSIST_STATE
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_DONT_PERSIST_STATE, 1);
#endif
/* Prevent update of the snmpapp.conf file */
#ifdef NETSNMP_DS_LIB_DISABLE_PERSISTENT_LOAD
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_DISABLE_PERSISTENT_LOAD, 1);
#endif
#ifdef NETSNMP_DS_LIB_DONT_PRINT_UNITS
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_DONT_PRINT_UNITS, 1);
#endif
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICK_PRINT, 1);
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_QUICKE_PRINT, 1);
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_PRINT_BARE_VALUE, 1);
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID, NETSNMP_DS_LIB_NUMERIC_TIMETICKS, 1);
session.securityEngineID = 0;
session.securityEngineIDLen = 0;
session.securityName = 0;
session.securityNameLen = 0;
session.contextEngineID = 0;
session.contextEngineIDLen = 0;
session.contextName = 0;
session.contextNameLen = 0;
session.contextEngineID = 0;
session.contextEngineIDLen = 0;
/* verify snmp version is accurate */
if (snmp_version == 2) {
session.version = SNMP_VERSION_2c;
session.securityModel = SNMP_SEC_MODEL_SNMPv2c;
} else if (snmp_version == 1) {
session.version = SNMP_VERSION_1;
session.securityModel = SNMP_SEC_MODEL_SNMPv1;
} else if (snmp_version == 3) {
session.version = SNMP_VERSION_3;
session.securityModel = USM_SEC_MODEL_NUMBER;
} else {
SPINE_LOG(("Device[%i] ERROR: SNMP Version Error for Device '%s'", host_id, hostname));
return 0;
}
snprintf(hostnameport, BUFSIZE, "%s:%i", hostname, snmp_port);
session.peername = hostnameport;
session.retries = set.snmp_retries;
session.timeout = (snmp_timeout * 1000); /* net-snmp likes microseconds */
SPINE_LOG_HIGH(("Device[%i] INFO: SNMP Device '%s' has a timeout of %ld (%d), with %d retries", host_id, hostnameport, session.timeout, snmp_timeout, session.retries));
if ((snmp_version == 2) || (snmp_version == 1)) {
session.community = (unsigned char*) snmp_community;
session.community_len = strlen(snmp_community);
} else {
session.securityName = snmp_username;
session.securityNameLen = strlen(session.securityName);
if (snmp_context && strlen(snmp_context)) {
session.contextName = snmp_context;
session.contextNameLen = strlen(session.contextName);
}
if (snmp_engine_id && strlen(snmp_engine_id)) {
session.contextEngineID = (unsigned char*) snmp_engine_id;
session.contextEngineIDLen = strlen(snmp_engine_id);
}
session.securityAuthKeyLen = USM_AUTH_KU_LEN;
/* set the authentication protocol */
if (strcmp(snmp_auth_protocol, "MD5") == 0) {
#ifndef NETSNMP_DISABLE_MD5
/* set the authentication method to MD5 */
session.securityAuthProto = snmp_duplicate_objid(usmHMACMD5AuthProtocol, USM_AUTH_PROTO_MD5_LEN);
session.securityAuthProtoLen = USM_AUTH_PROTO_MD5_LEN;
#else
SPINE_LOG(("SNMP: Error MD5 is no longer supported on this system."));
return 0;
#endif
} else if (strcmp(snmp_auth_protocol, "SHA") == 0) {
session.securityAuthProto = snmp_duplicate_objid(usmHMACSHA1AuthProtocol, USM_AUTH_PROTO_SHA_LEN);
session.securityAuthProtoLen = USM_AUTH_PROTO_SHA_LEN;
} else if (strcmp(snmp_auth_protocol, "SHA224") == 0) {
#if defined(HAVE_EVP_SHA224) && defined(NETSNMP_USMAUTH_HMAC128SHA224)
session.securityAuthProto = snmp_duplicate_objid(usmHMAC128SHA224AuthProtocol, OID_LENGTH(usmHMAC128SHA224AuthProtocol));
session.securityAuthProtoLen = OID_LENGTH(usmHMAC128SHA224AuthProtocol);
#else
SPINE_LOG(("SNMP: Error SHA224 is not supported on this system. Upgrade the Net-SNMP API to 5.8 "));
return 0;
#endif
} else if (strcmp(snmp_auth_protocol, "SHA256") == 0) {
#if defined(HAVE_EVP_SHA224) && defined(NETSNMP_USMAUTH_HMAC192SHA256)
session.securityAuthProto = snmp_duplicate_objid(usmHMAC192SHA256AuthProtocol, OID_LENGTH(usmHMAC192SHA256AuthProtocol));
session.securityAuthProtoLen = OID_LENGTH(usmHMAC192SHA256AuthProtocol);
#else
SPINE_LOG(("SNMP: Error SHA256 is not supported on this system. Upgrade the Net-SNMP API to 5.8 "));
return 0;
#endif
} else if (strcmp(snmp_auth_protocol, "SHA384") == 0) {
#if defined(HAVE_EVP_SHA384) && defined(NETSNMP_USMAUTH_HMAC256SHA384)
session.securityAuthProto = snmp_duplicate_objid(usmHMAC256SHA384AuthProtocol, OID_LENGTH(usmHMAC256SHA384AuthProtocol));
session.securityAuthProtoLen = USM_HMAC256SHA384_AUTH_LEN;
#else
SPINE_LOG(("SNMP: Error SHA384 is not supported on this system. Upgrade the Net-SNMP API to 5.8 "));
return 0;
#endif
} else if (strcmp(snmp_auth_protocol, "SHA512") == 0) {
#if defined(HAVE_EVP_SHA384) && defined(NETSNMP_USMAUTH_HMAC384SHA512)
session.securityAuthProto = snmp_duplicate_objid(usmHMAC384SHA512AuthProtocol, OID_LENGTH(usmHMAC384SHA512AuthProtocol));
session.securityAuthProtoLen = USM_HMAC384SHA512_AUTH_LEN;
#else
SPINE_LOG(("SNMP: Error SHA512 is not supported on this system. Upgrade the Net-SNMP API to 5.8 "));
return 0;
#endif
}
if (strlen(snmp_password)) {
/* set the authentication key to the hashed version. The password must me at least 8 char */
if (generate_Ku(session.securityAuthProto,
session.securityAuthProtoLen,
(u_char *) snmp_password,
strlen(snmp_password),
session.securityAuthKey,
&session.securityAuthKeyLen) != SNMPERR_SUCCESS) {
SPINE_LOG(("SNMP: Error generating SNMPv3 Ku from authentication pass phrase."));
}
}
/* set the privacy protocol to none */
if (strcmp(snmp_priv_protocol, "[None]") == 0 || (strlen(snmp_priv_passphrase) == 0)) {
session.securityPrivProto = snmp_duplicate_objid(usmNoPrivProtocol, OID_LENGTH(usmNoPrivProtocol));
session.securityPrivProtoLen = OID_LENGTH(usmNoPrivProtocol);
session.securityPrivKeyLen = USM_PRIV_KU_LEN;
/* set the security level to authenticate, but not encrypted */
if (strlen(snmp_password)) {
session.securityLevel = SNMP_SEC_LEVEL_AUTHNOPRIV;
} else {
session.securityLevel = SNMP_SEC_LEVEL_NOAUTH;
}
} else {
if (strcmp(snmp_priv_protocol, "DES") == 0) {
#if defined(USM_PRIV_PROTO_DES_LEN) && !defined(NETSNMP_DISABLE_DES)
session.securityPrivProto = snmp_duplicate_objid(usmDESPrivProtocol, USM_PRIV_PROTO_DES_LEN);
session.securityPrivProtoLen = USM_PRIV_PROTO_DES_LEN;
session.securityPrivKeyLen = USM_PRIV_KU_LEN;
session.securityLevel = SNMP_SEC_LEVEL_AUTHPRIV;
#else
SPINE_LOG(("SNMP: Error DES is no longer supported on this system"));
return 0;
#endif
} else if (strcmp(snmp_priv_protocol, "AES128") == 0) {
#if defined(USM_PRIV_PROTO_AES_LEN)
session.securityPrivProto = snmp_duplicate_objid(usmAESPrivProtocol, USM_PRIV_PROTO_AES_LEN);
session.securityPrivProtoLen = USM_PRIV_PROTO_AES_LEN;
session.securityPrivKeyLen = USM_PRIV_KU_LEN;
session.securityLevel = SNMP_SEC_LEVEL_AUTHPRIV;
#else
session.securityPrivProto = snmp_duplicate_objid(usmAES128PrivProtocol, OID_LENGTH(usmAES128PrivProtocol));
session.securityPrivProtoLen = OID_LENGTH(usmAES128PrivProtocol);
session.securityPrivKeyLen = USM_PRIV_KU_LEN;
session.securityLevel = SNMP_SEC_LEVEL_AUTHPRIV;
#endif
} else if(strcmp(snmp_priv_protocol, "AES192") == 0) {
#if defined(NETSNMP_DRAFT_BLUMENTHAL_AES_04) && defined(USM_CREATE_USER_PRIV_AES192)
session.securityPrivProto = snmp_duplicate_objid(usmAES192PrivProtocol, OID_LENGTH(usmAES192PrivProtocol));
session.securityPrivProtoLen = OID_LENGTH(usmAES192PrivProtocol);
session.securityPrivKeyLen = BYTESIZE(SNMP_TRANS_PRIVLEN_AES192);
session.securityLevel = SNMP_SEC_LEVEL_AUTHPRIV;
#else
SPINE_LOG(("SNMP: Error AES-192 is not supported in the Net-SNMP API, upgrade the Net-SNMP libraries."));
return 0;
#endif
} else if(strcmp(snmp_priv_protocol, "AES256") == 0) {
#if defined(NETSNMP_DRAFT_BLUMENTHAL_AES_04) && defined(USM_CREATE_USER_PRIV_AES256)
session.securityPrivProto = snmp_duplicate_objid(usmAES256PrivProtocol, OID_LENGTH(usmAES256PrivProtocol));
session.securityPrivProtoLen = OID_LENGTH(usmAES256PrivProtocol);
session.securityPrivKeyLen = BYTESIZE(SNMP_TRANS_PRIVLEN_AES256);
session.securityLevel = SNMP_SEC_LEVEL_AUTHPRIV;
#else
SPINE_LOG(("SNMP: Error AES-256 is not supported in the Net-SNMP API, upgrade the Net-SNMP libraries."));
return 0;
#endif
}
/* set the privacy key to the hashed version. */
if (generate_Ku(session.securityAuthProto,
session.securityAuthProtoLen,
(u_char *) snmp_priv_passphrase,
strlen(snmp_priv_passphrase),
session.securityPrivKey,
&session.securityPrivKeyLen) != SNMPERR_SUCCESS) {
SPINE_LOG(("SNMP: Error generating SNMPv3 Ku from privacy pass phrase."));
return 0;
}
}
}
/* open SNMP Session */
thread_mutex_lock(LOCK_SNMP);
sessp = snmp_sess_open(&session);
thread_mutex_unlock(LOCK_SNMP);
if (!sessp) {
if (is_debug_device(host_id)) {
SPINE_LOG(("ERROR: Problem initializing SNMP session '%s'", hostname));
} else {
SPINE_LOG_MEDIUM(("ERROR: Problem initializing SNMP session '%s'", hostname));
}
}
return sessp;
}
/*! \fn void snmp_host_cleanup(void *snmp_session)
* \brief closes an established snmp session
*
* This function performs cleanup of the snmp sessions once polling is completed
* for a host.
*
*/
void snmp_host_cleanup(void *snmp_session) {
if (snmp_session != NULL) {
snmp_sess_close(snmp_session);
}
}
/*! \fn char *snmp_get_base(host_t *current_host, char *snmp_oid, bool should_fail)
* \brief performs a single snmp_get for a specific snmp OID
*
* This function will poll a specific snmp OID for a host. The host snmp
* session must already be established.
*
* \return returns the character representaton of the snmp OID, or "U" if
* unsuccessful.
*
*/
char *snmp_get_base(host_t *current_host, char *snmp_oid, bool should_fail) {
struct snmp_pdu *pdu = NULL;
struct snmp_pdu *response = NULL;
struct variable_list *vars = NULL;
size_t anOID_len = MAX_OID_LEN;
oid anOID[MAX_OID_LEN];
int status;
char *result_string;
char temp_result[RESULTS_BUFFER];
if (!(result_string = (char *) malloc(RESULTS_BUFFER))) {
die("ERROR: Fatal malloc error: snmp.c snmp_get!");
}
result_string[0] = '\0';
if (current_host->ignore_host) {
SPINE_LOG_HIGH(("WARNING: Skipped oid '%s' for Device[%d] as host ignore flag is active", snmp_oid, current_host->id));
SET_UNDEFINED(result_string);
return result_string;
}
status = STAT_DESCRIP_ERROR;
if (current_host->snmp_session != NULL) {
anOID_len = MAX_OID_LEN;
SPINE_LOG_DEVDBG(("Device[%i] DEBUG: snmp_pdu_create(%s)", current_host->id, snmp_oid));
pdu = snmp_pdu_create(SNMP_MSG_GET);
SPINE_LOG_DEVDBG(("Device[%i] DEBUG: snmp_pdu_create(%s) [complete]", current_host->id, snmp_oid));
if (pdu != NULL) {
SPINE_LOG_DEVDBG(("Device[%i] DEBUG: snmp_parse_oid(%s)", current_host->id, snmp_oid));
if (!snmp_parse_oid(snmp_oid, anOID, &anOID_len)) {
SPINE_LOG_DEVDBG(("Device[%i] DEBUG: snmp_parse_oid(%s) [complete]", current_host->id, snmp_oid));
SPINE_LOG(("Device[%i] ERROR: SNMP Get Problems parsing SNMP OID %s", current_host->id, snmp_oid));
SET_UNDEFINED(result_string);
return result_string;
} else {
SPINE_LOG_DEVDBG(("Device[%i] DEBUG: snmp_parse_oid(%s) [complete]", current_host->id, snmp_oid));
SPINE_LOG_DEVDBG(("Device[%i] DEBUG: snmp_add_null_var(%s)", current_host->id, snmp_oid));
snmp_add_null_var(pdu, anOID, anOID_len);
SPINE_LOG_DEVDBG(("Device[%i] DEBUG: snmp_add_null_var(%s) [complete]", current_host->id, snmp_oid));
}
/* poll host */
SPINE_LOG_DEVDBG(("Device[%i] DEBUG: snmp_sess_sync_response(%s)", current_host->id, snmp_oid));
status = snmp_sess_synch_response(current_host->snmp_session, pdu, &response);
SPINE_LOG_DEVDBG(("Device[%i] DEBUG: snmp_sess_sync_response(%s) [complete]", current_host->id, snmp_oid));
}
/* add status to host structure */
current_host->snmp_status = status;
/* liftoff, successful poll, process it!! */
if (status == STAT_DESCRIP_ERROR) {
SPINE_LOG(("ERROR: Unable to create SNMP PDU"));
SET_UNDEFINED(result_string);
status = STAT_ERROR;
response = NULL;
} else if (status == STAT_SUCCESS) {
if (response == NULL) {
SPINE_LOG(("ERROR: An internal Net-Snmp error condition detected in Cacti snmp_get"));
SET_UNDEFINED(result_string);
status = STAT_ERROR;
} else if (response->errstat == SNMP_ERR_NOERROR &&
response->variables != NULL &&
response->variables->name != NULL) {
vars = response->variables;
if (vars->type == SNMP_NOSUCHOBJECT) {
SET_UNDEFINED(result_string);
status = STAT_ERROR;
SPINE_LOG_HIGH(("ERROR: No such Object for oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
} else if (vars->type == SNMP_NOSUCHINSTANCE) {
SET_UNDEFINED(result_string);
status = STAT_ERROR;
// We will ignore the new OID error
if (!strstr(snmp_oid, ".1.3.6.1.6.3.10.2.1.3.0")) {
SPINE_LOG_HIGH(("WARNING: No such Instance for oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
} else {
SPINE_LOG_DEBUG(("NOTE: Legacy SNMP agent found! No per second Uptime oid found '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
}
} else if (vars->type == SNMP_ENDOFMIBVIEW) {
SET_UNDEFINED(result_string);
status = STAT_ERROR;
SPINE_LOG_HIGH(("ERROR: End of Mib for oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
} else {
snprint_value(temp_result, RESULTS_BUFFER, vars->name, vars->name_length, vars);
snprintf(result_string, RESULTS_BUFFER, "%s", trim(temp_result));
}
} else {
SPINE_LOG_HIGH(("ERROR: Failed to get oid '%s' for Device[%d] with Response[%ld]", snmp_oid, current_host->id, response->errstat));
}
} else if (response != NULL && response->variables != NULL) {
vars = response->variables;
if (vars->type == SNMP_NOSUCHOBJECT) {
SET_UNDEFINED(result_string);
status = STAT_ERROR;
SPINE_LOG_HIGH(("ERROR: No such Object for oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
} else if (vars->type == SNMP_NOSUCHINSTANCE) {
SET_UNDEFINED(result_string);
status = STAT_ERROR;
// We will ignore the new OID error
if (!strstr(snmp_oid, ".1.3.6.1.6.3.10.2.1.3.0")) {
SPINE_LOG_HIGH(("WARNING: No such Instance for oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
} else {
SPINE_LOG_DEBUG(("NOTE: Per second level uptime oid missing oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
}
} else if (vars->type == SNMP_ENDOFMIBVIEW) {
SET_UNDEFINED(result_string);
status = STAT_ERROR;
SPINE_LOG_HIGH(("ERROR: End of Mib for oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
} else {
SET_UNDEFINED(result_string);
status = STAT_ERROR;
SPINE_LOG_HIGH(("ERROR: Unknown error getting oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
}
} else if (status == STAT_TIMEOUT) {
SPINE_LOG_HIGH(("ERROR: Timeout getting oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
} else {
SPINE_LOG_HIGH(("ERROR: Unknown error getting oid '%s' for Device[%d] with Status[%d]", snmp_oid, current_host->id, status));
}
if (response != NULL && status != STAT_DESCRIP_ERROR) {
snmp_free_pdu(response);
response = NULL;
}
}
if (status != STAT_SUCCESS && should_fail) {
current_host->ignore_host = TRUE;
SET_UNDEFINED(result_string);
}
return result_string;
}
char *snmp_get(host_t *current_host, char *snmp_oid) {
return snmp_get_base(current_host, snmp_oid, true);
}
/*! \fn char *snmp_getnext(host_t *current_host, char *snmp_oid)
* \brief performs a single snmp_getnext for a specific snmp OID
*
* This function will poll a specific snmp OID for a host. The host snmp
* session must already be established.
*
* \return returns the character representaton of the snmp OID, or "U" if
* unsuccessful.
*
*/
char *snmp_getnext(host_t *current_host, char *snmp_oid) {
struct snmp_pdu *pdu = NULL;
struct snmp_pdu *response = NULL;
struct variable_list *vars = NULL;
size_t anOID_len = MAX_OID_LEN;
oid anOID[MAX_OID_LEN];
int status;
char *result_string;
char temp_result[RESULTS_BUFFER];
if (!(result_string = (char *) malloc(RESULTS_BUFFER))) {
die("ERROR: Fatal malloc error: snmp.c snmp_get!");
}
result_string[0] = '\0';
status = STAT_DESCRIP_ERROR;
if (current_host->snmp_session != NULL) {
anOID_len = MAX_OID_LEN;
pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
if (!snmp_parse_oid(snmp_oid, anOID, &anOID_len)) {
SPINE_LOG(("Device[%i] ERROR: SNMP Getnext Problems parsing SNMP OID %s", current_host->id, snmp_oid));
SET_UNDEFINED(result_string);
return result_string;
} else {
snmp_add_null_var(pdu, anOID, anOID_len);
}
/* poll host */
status = snmp_sess_synch_response(current_host->snmp_session, pdu, &response);
/* add status to host structure */
current_host->snmp_status = status;
/* liftoff, successful poll, process it!! */
if (status == STAT_SUCCESS) {
if (response == NULL) {
SPINE_LOG(("ERROR: An internal Net-Snmp error condition detected in Cacti snmp_get"));
SET_UNDEFINED(result_string);
status = STAT_ERROR;
} else {
if (response->errstat == SNMP_ERR_NOERROR) {
vars = response->variables;
if (vars != NULL) {
snprint_value(temp_result, RESULTS_BUFFER, vars->name, vars->name_length, vars);
snprint_asciistring(result_string, RESULTS_BUFFER, (unsigned char *)temp_result, strlen(temp_result));
} else {
SET_UNDEFINED(result_string);
status = STAT_ERROR;
}
}
}
}
if (response) {
snmp_free_pdu(response);
response = NULL;
}
} else {
status = STAT_DESCRIP_ERROR;
}
if (status != STAT_SUCCESS) {
current_host->ignore_host = TRUE;
SET_UNDEFINED(result_string);
}
return result_string;
}
/*! \fn char *snmp_count(host_t *current_host, char *snmp_oid)
* \brief counts entries of snmp table specified by a specific snmp OID
*
* This function will poll a specific snmp OID for a host. The host snmp
* session must already be established.
*
* \return returns count of table entries
*
*/
int snmp_count(host_t *current_host, char *snmp_oid) {
struct snmp_pdu *pdu = NULL;
struct snmp_pdu *response = NULL;
struct variable_list *vars = NULL;
size_t anOID_len = MAX_OID_LEN;
size_t rootlen = MAX_OID_LEN;
oid anOID[MAX_OID_LEN];
oid root[MAX_OID_LEN];
int status;
int ok = 1;
int error_occurred = 0;
int count = 0;
status = STAT_DESCRIP_ERROR;
if (is_debug_device(current_host->id)) {
SPINE_LOG(("DEBUG: walk starts at OID %s", snmp_oid));
} else {
SPINE_LOG_DEBUG(("DEBUG: walk starts at OID %s", snmp_oid));
}
if (current_host->snmp_session != NULL) {
rootlen = MAX_OID_LEN;
/* parse input parm to an array for use with snmp functions */
if (!snmp_parse_oid(snmp_oid, root, &rootlen)) {
SPINE_LOG(("Device[%i] ERROR: SNMP Count Problems parsing SNMP OID %s", current_host->id, snmp_oid));
return count;
}
memmove(anOID, root, rootlen * sizeof(oid));
anOID_len = rootlen;
while (ok && !error_occurred) {
/* create PDU for GETNEXT request */
pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
snmp_add_null_var(pdu, anOID, anOID_len);
/* do the request, use thread safe call */
status = snmp_sess_synch_response(current_host->snmp_session, pdu, &response);
/* add status to host structure */
current_host->snmp_status = status;
//SPINE_LOG_DEBUG(("TRACE: Status %i Response %i", status, response->errstat));
if (status == STAT_SUCCESS) {
if (response->errstat == SNMP_ERR_NOERROR) {
/* check resulting variables */
for (vars = response->variables; vars; vars = vars->next_variable) {
if ((vars->name_length < rootlen) || (memcmp(root, vars->name, rootlen * sizeof(oid)) != 0)) {
/* next OID is not part of snmptable */
ok = 0;
continue;
}
count ;
/* END OF MIB or NO SUCH OBJECT or NO SUCH INSTANCE */
if ((vars->type != SNMP_ENDOFMIBVIEW) &&
(vars->type != SNMP_NOSUCHOBJECT) &&
(vars->type != SNMP_NOSUCHINSTANCE)) {
/* valid data, so perform a compare */
if (snmp_oid_compare(anOID, anOID_len, vars->name, vars->name_length) >= 0) {
SPINE_LOG(("ERROR: OID not increasing"));
ok = 0;
error_occurred = 1;
}
/* prepare next turn */
memmove((char *) anOID, (char *) vars->name, vars->name_length * sizeof(oid));
anOID_len = vars->name_length;
} else {
/* abnormal end of loop */
ok = 0;
}
}
} else {
SPINE_LOG(("ERROR: An internal Net-Snmp error condition detected in Cacti snmp_count"));
}
} else if (status == STAT_TIMEOUT) {
SPINE_LOG(("ERROR: Timeout detected in Cacti snmp_count"));
ok = 0;
error_occurred = 1;
} else { /* status == STAT_ERROR */
SPINE_LOG(("ERROR: An internal Net-Snmp error condition detected in Cacti snmp_count (STAT_ERROR)"));
ok = 0;
error_occurred = 1;
}
if (response) {
snmp_free_pdu(response);
}
}
} else {
status = STAT_DESCRIP_ERROR;
}
if (status != STAT_SUCCESS) {
current_host->ignore_host = TRUE;
}
return count;
}
/*! \fn void snmp_snprint_value(char *obuf, size_t buf_len, const oid *objid, size_t objidlen, struct variable_list *variable)
*
* \brief replacement for the buggy net-snmp.org snprint_value function
*
* This function format an output buffer with the correct string representation
* of an snmp OID result fetched with snmp_get_multi. The buffer pointed to by
* the function is modified.
*
*/
void snmp_snprint_value(char *obuf, size_t buf_len, const oid *objid, size_t objidlen, struct variable_list *variable) {
u_char *buf = NULL;
size_t out_len = 0;
if (buf_len > 0) {
if ((buf = (u_char *) calloc(buf_len, 1)) != 0) {
sprint_realloc_by_type(&buf, &buf_len, &out_len, 0, variable, NULL, NULL, NULL);
snprintf(obuf, buf_len, "%s", buf);
} else {
SET_UNDEFINED(obuf);
}
free(buf);
} else {
SET_UNDEFINED(obuf);
}
}
/*! \fn char *snmp_get_multi(host_t *current_host, target_t *poller_items, snmp_oids_t *snmp_oids, int num_oids)
* \brief performs multiple OID snmp_get's in a single network call
*
* This function will a group of snmp OID's for a host. The host snmp
* session must already be established. The function will modify elements of
* the snmp_oids array with the results from the snmp api call.
*
*/
void snmp_get_multi(host_t *current_host, target_t *poller_items, snmp_oids_t *snmp_oids, int num_oids) {
struct snmp_pdu *pdu = NULL;
struct snmp_pdu *response = NULL;
struct variable_list *vars = NULL;
int status;
int i;
int array_count;
int index_count;
char temp_result[RESULTS_BUFFER];
struct nameStruct {
oid name[MAX_OID_LEN];
size_t name_len;
} *name, *namep;
/* load up oids */
namep = name = (struct nameStruct *) calloc(num_oids, sizeof(*name));
pdu = snmp_pdu_create(SNMP_MSG_GET);
for (i = 0; i < num_oids; i ) {
namep->name_len = MAX_OID_LEN;
if (!snmp_parse_oid(snmp_oids[i].oid, namep->name, &namep->name_len)) {
SPINE_LOG(("Device[%i] DS[%i] ERROR: Problems parsing Multi SNMP OID! (oid: %s), Set MAX_OIDS to 1 for this host to isolate bad OID", current_host->id, poller_items[snmp_oids[i].array_position].local_data_id, snmp_oids[i].oid));
/* Mark this OID as "bad" */
SET_UNDEFINED(snmp_oids[i].result);
} else {
snmp_add_null_var(pdu, namep->name, namep->name_len);
}
namep ;
}
status = STAT_DESCRIP_ERROR;
/* execute the multi-get request */
retry:
status = snmp_sess_synch_response(current_host->snmp_session, pdu, &response);
/* add status to host structure */
current_host->snmp_status = status;
/* liftoff, successful poll, process it!! */
if (status == STAT_SUCCESS) {
if (response == NULL) {
SPINE_LOG(("ERROR: An internal Net-Snmp error condition detected in Cacti snmp_get_multi"));
status = STAT_ERROR;
} else {
if (response->errstat == SNMP_ERR_NOERROR) {
vars = response->variables;
for (i = 0; i < num_oids && vars; i ) {
if (!IS_UNDEFINED(snmp_oids[i].result)) {
snprint_value(temp_result, RESULTS_BUFFER, vars->name, vars->name_length, vars);
snprintf(snmp_oids[i].result, RESULTS_BUFFER, "%s", trim(temp_result));
vars = vars->next_variable;
}
}
} else {
if (response->errindex != 0) {
index_count = 1;
array_count = 0;
/* Find our index against errindex */
while (array_count < num_oids) {
if (IS_UNDEFINED(snmp_oids[array_count].result) ) {
array_count ;
} else {
/* if we have found our error, exit */
if (index_count == response->errindex) {
SET_UNDEFINED(snmp_oids[array_count].result);
break;
}
array_count ;
index_count ;
}
}
/* remove the invalid OID from the PDU */
pdu = snmp_fix_pdu(response, SNMP_MSG_GET);
/* free the previous response */
snmp_free_pdu(response);
response = NULL;
if (pdu != NULL) {
/* retry the request */
goto retry;
} else {
/* all OID's errored out so exit cleanly */
status = STAT_SUCCESS;
}
}
}
}
}
if (status == STAT_TIMEOUT) {
current_host->ignore_host = 1;
for (i = 0; i < num_oids; i ) {
SET_UNDEFINED(snmp_oids[i].result);
}
}
if (response != NULL) {
snmp_free_pdu(response);
}
free(name);
}