C++ snmp_add_null_var函数代码示例

void snmp_start_read_rssi(char *host) {
	struct snmp_pdu *pdu;
	struct snmp_session session;
	const char *community = "public";

	if (oid_rssi_ts1_length == 0 || oid_rssi_ts2_length == 0)
		return;

	snmp_rssi_received = 0;

	if (snmp_session_rssi != NULL) {
		snmp_close(snmp_session_rssi);
		snmp_session_rssi = NULL;
	}

	snmp_sess_init(&session);
	session.version = SNMP_VERSION_1;
	session.peername = strdup(host);
	session.community = (unsigned char *)strdup(community);
	session.community_len = strlen(community);
	session.callback = snmp_get_rssi_cb;
	if (!(snmp_session_rssi = snmp_open(&session))) {
		console_log("snmp error: error opening session to host %s\n", host);
		return;
	}

	pdu = snmp_pdu_create(SNMP_MSG_GET);
	snmp_add_null_var(pdu, oid_rssi_ts1, oid_rssi_ts1_length);
	snmp_add_null_var(pdu, oid_rssi_ts2, oid_rssi_ts2_length);
	if (!snmp_send(snmp_session_rssi, pdu))
		console_log("snmp error: error sending rssi request to host %s\n", host);
	free(session.peername);
	free(session.community);
}

void
simpleSNMPsend(struct snmp_session *session,
	       oid *name,
	       size_t name_length)
{
    struct snmp_pdu *pdu;
    oid uptime[MAX_OID_LEN];
    size_t uptime_length;

    /* 
     * Create PDU for GET request and add object names to request.
     */
    pdu = snmp_pdu_create(SNMP_MSG_GET);

    /* 
     * First insert uptime request into PDU.
     */
    uptime_length = MAX_OID_LEN;
    if (!snmp_parse_oid("system.sysUpTime.0",
			uptime, &uptime_length)) {
	    printf("error parsing oid: system.sysUpTime.0\n");
    }
    snmp_add_null_var(pdu, uptime, uptime_length);

    snmp_add_null_var(pdu, name, name_length);

    /* 
     * Perform the request.
     */

    snmp_send(session, pdu);
}

int ups_mib_mgr_get_upsBypassEntry(struct snmp_session *s, upsBypassEntry_t **upsBypassEntry)
{
    struct snmp_session *peer;
    struct snmp_pdu *request, *response;
    struct variable_list *vars;
    int status;

    request = snmp_pdu_create(SNMP_MSG_GETNEXT);
    snmp_add_null_var(request, upsBypassVoltage, sizeof(upsBypassVoltage)/sizeof(oid));
    snmp_add_null_var(request, upsBypassCurrent, sizeof(upsBypassCurrent)/sizeof(oid));
    snmp_add_null_var(request, upsBypassPower, sizeof(upsBypassPower)/sizeof(oid));

    peer = snmp_open(s);
    if (!peer) {
        return -1;
    }

    status = snmp_synch_response(peer, request, &response);
    if (status != STAT_SUCCESS) {
        if (response) snmp_free_pdu(response);
        snmp_close(peer);
        return -2;
    }

    *upsBypassEntry = (upsBypassEntry_t *) malloc(sizeof(upsBypassEntry_t));
    if (! *upsBypassEntry) {
        if (response) snmp_free_pdu(response);
        snmp_close(peer);
        return -4;
    }

    for (vars = response->variables; vars; vars = vars->next_variable) {
        if (vars->name_length > sizeof(upsBypassVoltage)/sizeof(oid)
            && memcmp(vars->name, upsBypassVoltage, sizeof(upsBypassVoltage)) == 0) {
            (*upsBypassEntry)->__upsBypassVoltage = *vars->val.integer;
            (*upsBypassEntry)->upsBypassVoltage = &((*upsBypassEntry)->__upsBypassVoltage);
        }
        if (vars->name_length > sizeof(upsBypassCurrent)/sizeof(oid)
            && memcmp(vars->name, upsBypassCurrent, sizeof(upsBypassCurrent)) == 0) {
            (*upsBypassEntry)->__upsBypassCurrent = *vars->val.integer;
            (*upsBypassEntry)->upsBypassCurrent = &((*upsBypassEntry)->__upsBypassCurrent);
        }
        if (vars->name_length > sizeof(upsBypassPower)/sizeof(oid)
            && memcmp(vars->name, upsBypassPower, sizeof(upsBypassPower)) == 0) {
            (*upsBypassEntry)->__upsBypassPower = *vars->val.integer;
            (*upsBypassEntry)->upsBypassPower = &((*upsBypassEntry)->__upsBypassPower);
        }
    }

    if (response) snmp_free_pdu(response);

    if (snmp_close(peer) == 0) {
        return -5;
    }

    return 0;
}

int ups_mib_mgr_get_upsOutput(struct snmp_session *s, upsOutput_t **upsOutput)
{
    struct snmp_session *peer;
    struct snmp_pdu *request, *response;
    struct variable_list *vars;
    int status;

    request = snmp_pdu_create(SNMP_MSG_GETNEXT);
    snmp_add_null_var(request, upsOutputSource, sizeof(upsOutputSource)/sizeof(oid));
    snmp_add_null_var(request, upsOutputFrequency, sizeof(upsOutputFrequency)/sizeof(oid));
    snmp_add_null_var(request, upsOutputNumLines, sizeof(upsOutputNumLines)/sizeof(oid));

    peer = snmp_open(s);
    if (!peer) {
        return -1;
    }

    status = snmp_synch_response(peer, request, &response);
    if (status != STAT_SUCCESS) {
        if (response) snmp_free_pdu(response);
        snmp_close(peer);
        return -2;
    }

    *upsOutput = (upsOutput_t *) malloc(sizeof(upsOutput_t));
    if (! *upsOutput) {
        if (response) snmp_free_pdu(response);
        snmp_close(peer);
        return -4;
    }

    for (vars = response->variables; vars; vars = vars->next_variable) {
        if (vars->name_length > sizeof(upsOutputSource)/sizeof(oid)
            && memcmp(vars->name, upsOutputSource, sizeof(upsOutputSource)) == 0) {
            (*upsOutput)->__upsOutputSource = *vars->val.integer;
            (*upsOutput)->upsOutputSource = &((*upsOutput)->__upsOutputSource);
        }
        if (vars->name_length > sizeof(upsOutputFrequency)/sizeof(oid)
            && memcmp(vars->name, upsOutputFrequency, sizeof(upsOutputFrequency)) == 0) {
            (*upsOutput)->__upsOutputFrequency = *vars->val.integer;
            (*upsOutput)->upsOutputFrequency = &((*upsOutput)->__upsOutputFrequency);
        }
        if (vars->name_length > sizeof(upsOutputNumLines)/sizeof(oid)
            && memcmp(vars->name, upsOutputNumLines, sizeof(upsOutputNumLines)) == 0) {
            (*upsOutput)->__upsOutputNumLines = *vars->val.integer;
            (*upsOutput)->upsOutputNumLines = &((*upsOutput)->__upsOutputNumLines);
        }
    }

    if (response) snmp_free_pdu(response);

    if (snmp_close(peer) == 0) {
        return -5;
    }

    return 0;
}

static struct snmp_pdu *
snmp_get_item(char *host, char *community, char *mib_item)
{
	struct snmp_session session, *ss;
	struct snmp_pdu *request = NULL, *result = NULL;
	oid Oid[MAX_OID_LEN];
	unsigned int oid_len = MAX_OID_LEN;

	/* initialize the SNMP session */
	snmp_sess_init(&session);
	session.peername = host;
	session.community = (uchar_t *)community;
	session.community_len = strlen((const char *)session.community);
	session.version = SNMP_VERSION_1;
	session.retries = 0;

	if ((ss = snmp_open(&session)) == NULL)
		return (NULL);

	/* add the requested data */
	if (!read_objid(mib_item, Oid, &oid_len))
		snmp_perror(mib_item);

	/* initialize the request PDU */
	request = snmp_pdu_create(SNMP_MSG_GET);
	snmp_add_null_var(request, Oid, oid_len);

	(void) snmp_synch_response(ss, request, &result);

	snmp_close(ss);

	return (result);
}

void prsnmpstr(char *stroid) {
    struct snmp_pdu *pdu, *resp;
    oid tmp_oid[MAX_OID_LEN];
    size_t tmp_oid_len=MAX_OID_LEN;
    int stat;
    char *tmp;

    pdu=snmp_pdu_create(SNMP_MSG_GET);
    read_objid(stroid, tmp_oid, &tmp_oid_len);
    snmp_add_null_var(pdu, tmp_oid, tmp_oid_len);
    stat=snmp_synch_response(ses, pdu, &resp);

    if (stat != STAT_SUCCESS || resp->errstat != SNMP_ERR_NOERROR) 
        perr(resp);

    if(resp->variables->val_len && strlen((char *)resp->variables->val.string)) {
        tmp=malloc((resp->variables->val_len+1) * sizeof(char));
        memcpy(tmp, resp->variables->val.string, resp->variables->val_len);
        tmp[resp->variables->val_len]=0;
        printf("%s", tmp);
        free(tmp);
    }
    
    if(resp)
            snmp_free_pdu(resp);

}

void prifalias(oid inst) {
    struct snmp_pdu *pdu, *resp;
    oid tmp_oid[] = { 1,3,6,1,2,1,31,1,1,1,18,0 };
    int stat;
    char *tmp;

    if(!extended) {
        fprintf(stderr, "ifalias is only available in eXtended mode\n");
        snmp_close(ses);
        SOCK_CLEANUP;
        exit(1);
    }
    
    tmp_oid[11]=inst;
    pdu=snmp_pdu_create(SNMP_MSG_GET);
    snmp_add_null_var(pdu, tmp_oid, sizeof(tmp_oid)/sizeof(oid));
    stat=snmp_synch_response(ses, pdu, &resp);

    if (stat != STAT_SUCCESS || resp->errstat != SNMP_ERR_NOERROR) 
        perr(resp);

    if(resp->variables->val_len && strlen((char *)resp->variables->val.string)) {
        tmp=malloc((resp->variables->val_len+1) * sizeof(char));
        memcpy(tmp, resp->variables->val.string, resp->variables->val_len);
        tmp[resp->variables->val_len]=0;
        printf("  \"%s\"", tmp);
        free(tmp);
    }

    if(resp)
            snmp_free_pdu(resp);

}

uint32_t getcntr32(int dir, oid inst) {
    struct snmp_pdu *pdu, *resp;
    oid iftable_oid[]  = { 1,3,6,1,2,1,2,2,1,0,0 };    // dir=9 ; inst=10
    int stat;
    uint32_t tmp;

    pdu=snmp_pdu_create(SNMP_MSG_GET);
    iftable_oid[9]=dir;
    iftable_oid[10]=inst;
    snmp_add_null_var(pdu, iftable_oid, sizeof(iftable_oid)/sizeof(oid));
    
    stat=snmp_synch_response(ses, pdu, &resp);
    if (stat != STAT_SUCCESS || resp->errstat != SNMP_ERR_NOERROR) 
        perr(resp);

    if(resp->variables->type != ASN_COUNTER) {
        fprintf(stderr, "\nError: unsupported data type (only 32bit counter is supported in normal mode)\n");
        snmp_close(ses);
        SOCK_CLEANUP;
        exit(1);
    }

    tmp=resp->variables->val.counter64->high;

    if(resp)
        snmp_free_pdu(resp);

    return tmp;
}

/*
 * response handler
 */
int asynch_response(int operation, struct snmp_session *sp, int reqid,
		    struct snmp_pdu *pdu, void *magic)
{
  struct session *host = (struct session *)magic;
  struct snmp_pdu *req;

  if (operation == NETSNMP_CALLBACK_OP_RECEIVED_MESSAGE) {
    if (print_result(STAT_SUCCESS, host->sess, pdu)) {
      host->current_oid++;			/* send next GET (if any) */
      if (host->current_oid->Name) {
	req = snmp_pdu_create(SNMP_MSG_GET);
	snmp_add_null_var(req, host->current_oid->Oid, host->current_oid->OidLen);
	if (snmp_send(host->sess, req))
	  return 1;
	else {
	  snmp_perror("snmp_send");
	  snmp_free_pdu(req);
	}
      }
    }
  }
  else
    print_result(STAT_TIMEOUT, host->sess, pdu);

  /* something went wrong (or end of variables) 
   * this host not active any more
   */
  active_hosts--;
  return 1;
}

/**
 * snmp_getn_bulk: Builds and sends a SNMP_BET_BULK pdu using snmp
 * @sessp: snmp session
 * @bulk_objid: string containing the OID entry.
 * @bulk_objid_len: len of OID string
 * @bulk_pdu: pointer to the PDU to be created
 * @bulk_response: pointer to the response for this PDU request
 * @num_repetitions: max OIDs for this request.
 *                   Note: this is the max requested. Actual number returned can be less
 *                   than maximum.  That depends on the target snmp agent.
 *
 * Return value: status from snmp_sess_synch_response(). See snmp_client.h of net-snmp library.
 *	STAT_SUCCESS
 *	STAT_ERROR
 *	STAT_TIMEOUT
 *
 *      Additionally, if status == STAT_SUCCESS, consumer of this routine needs to check for exception
 *      conditions.
 *      Possible exception conditions are SNMP_ENDOFMIBVIEW, SNMP_NOSUCHOBJECT, SNMP_NOSUCHINSTANCE
 **/
int snmp_getn_bulk( void *sessp,
                    oid *bulk_objid,
                    size_t bulk_objid_len,
                    struct snmp_pdu *bulk_pdu,
                    struct snmp_pdu **bulk_response,
                    int num_repetitions )
{
    int status;

    bulk_pdu = snmp_pdu_create(SNMP_MSG_GETBULK);

    bulk_pdu->non_repeaters = 0;

    bulk_pdu->max_repetitions = num_repetitions;

    snmp_add_null_var(bulk_pdu, bulk_objid, bulk_objid_len);

    /* Send the Request out.*/
    status = snmp_sess_synch_response(sessp, bulk_pdu, bulk_response);

    /*
     * Return the status.  Consumer of this util has to process the response.
     */
    return(status);

}

int
agentx_remove_agentcaps(netsnmp_session * ss,
                        oid * agent_cap, size_t agent_caplen)
{
    netsnmp_pdu    *pdu, *response;

    if (ss == NULL || !IS_AGENTX_VERSION(ss->version)) {
        return 0;
    }

    pdu = snmp_pdu_create(AGENTX_MSG_REMOVE_AGENT_CAPS);
    if (pdu == NULL)
        return 0;
    pdu->time = 0;
    pdu->sessid = ss->sessid;
    snmp_add_null_var(pdu, agent_cap, agent_caplen);

    if (agentx_synch_response(ss, pdu, &response) != STAT_SUCCESS)
        return 0;

    if (response->errstat != SNMP_ERR_NOERROR) {
        snmp_free_pdu(response);
        return 0;
    }

    snmp_free_pdu(response);
    return 1;
}

/* report the value interfaces.ifNumber.0, actually the number of interfaces */
static int snmp_get_ifcount(struct snmp_session *ss) {
  int nifaces = -1;
  oid ifcount[] = { 1, 3, 6, 1, 2, 1, 2, 1, 0 };
  struct snmp_pdu *pdu;
  struct snmp_pdu *response = NULL;
  int status;

  if ((pdu = snmp_pdu_create(SNMP_MSG_GET)) == NULL) {
    ifstat_error("snmp_pdu_create: %s", snmp_api_errstring(snmp_errno));
    return -1;
  }

  snmp_add_null_var(pdu, ifcount, sizeof(ifcount) / sizeof(oid));

  if ((status = snmp_synch_response(ss, pdu, &response)) != STAT_SUCCESS ||
      response->errstat != SNMP_ERR_NOERROR ||
      response->variables == NULL ||
      response->variables->type != ASN_INTEGER) {
    if (status == STAT_SUCCESS)
      ifstat_error("snmp: Error: %s", snmp_errstring(response->errstat));
    else
      ifstat_error("snmpget(interfaces.ifNumber.0): %s", snmp_sess_errstring(ss));
    if (response)
      snmp_free_pdu(response);
    return -1;
  }
  nifaces = *(response->variables->val.integer);
  snmp_free_pdu(response);  
  
  if (nifaces < 0)
    return -1;
  return nifaces;
}

void get_snmp(void *precord)
{
  snmpRecord *psnmp = (snmpRecord *)precord;
  SNMP_INFO *snmpinfo = (SNMP_INFO*)psnmp->dpvt;

  if (!(snmpinfo->sess = snmp_open(&snmpinfo->ss))) {
    snmp_perror("snmp_open");
  };

  snmpinfo->getreq = snmp_pdu_create(SNMP_MSG_GET);	/* send the first GET */
  if (! snmpinfo->getreq) {
    snmp_close(snmpinfo->sess);                 /* cleanup */
  }

  snmp_add_null_var(snmpinfo->getreq, snmpinfo->oid_info.Oid, snmpinfo->oid_info.OidLen);

  if (snmp_send(snmpinfo->sess, snmpinfo->getreq))
    hosts++;
  else {
    snmp_perror("snmp_setsend");
    snmp_free_pdu(snmpinfo->getreq);
  }

  active_hosts();
  snmp_close(snmpinfo->sess);                 /* cleanup */
}

void session_add_null_var(struct snmp_pdu *pdu, const char *name) {
  oid anOID[MAX_OID_LEN+1];
  size_t anOID_len = MAX_OID_LEN;

  get_node(name, anOID, &anOID_len);
  snmp_add_null_var(pdu, anOID, anOID_len);
}

/*
 * simple synchronous loop
 */
void synchronous (void)
{
  struct host *hp;

  for (hp = hosts; hp->name; hp++) {
    struct snmp_session ss, *sp;
    struct oid *op;

    snmp_sess_init(&ss);			/* initialize session */
    ss.version = SNMP_VERSION_2c;
    ss.peername = strdup(hp->name);
    ss.community = strdup(hp->community);
    ss.community_len = strlen(ss.community);
    if (!(sp = snmp_open(&ss))) {
      snmp_perror("snmp_open");
      continue;
    }
    for (op = oids; op->Name; op++) {
      struct snmp_pdu *req, *resp;
      int status;
      req = snmp_pdu_create(SNMP_MSG_GET);
      snmp_add_null_var(req, op->Oid, op->OidLen);
      status = snmp_synch_response(sp, req, &resp);
      if (!print_result(status, sp, resp)) break;
      snmp_free_pdu(resp);
    }
    snmp_close(sp);
  }
}