C++ snmp_sess_perror函数代码示例

int
snmp_init(selector_t *sel)
{
    struct snmp_session session;
#ifdef HAVE_NETSNMP
    netsnmp_transport *transport = NULL;
    static char *snmp_default_port = "udp:162";

    netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
			   NETSNMP_DS_LIB_MIB_ERRORS,
			   0);

    init_snmp("ipmi_ui");

    transport = netsnmp_tdomain_transport(snmp_default_port, 1, "udp");
    if (!transport) {
        snmp_sess_perror("ipmi_ui", &session);
	return -1;
    }
#else
    void *transport = NULL;
#endif
    snmp_sess_init(&session);
    session.peername = SNMP_DEFAULT_PEERNAME;
    session.version = SNMP_DEFAULT_VERSION;
    session.community_len = SNMP_DEFAULT_COMMUNITY_LEN;
    session.retries = SNMP_DEFAULT_RETRIES;
    session.timeout = SNMP_DEFAULT_TIMEOUT;
    session.local_port = SNMP_TRAP_PORT;
    session.callback = snmp_input;
    session.callback_magic = transport;
    session.authenticator = NULL;
    session.isAuthoritative = SNMP_SESS_UNKNOWNAUTH;

#ifdef HAVE_NETSNMP
    snmp_session = snmp_add(&session, transport, snmp_pre_parse, NULL);
#else
    snmp_session = snmp_open_ex(&session, snmp_pre_parse,
				NULL, NULL, NULL, NULL);
#endif
    if (snmp_session == NULL) {
        snmp_sess_perror("ipmi_ui", &session);
	return -1;
    }

    ipmi_sel_set_read_fds_handler(sel,
				  snmp_add_read_fds,
				  snmp_check_read_fds,
				  snmp_check_timeout,
				  NULL);

    return 0;
}

/*
 * send_trap_to_sess: sends a trap to a session but assumes that the
 * pdu is constructed correctly for the session type. 
 */
void
send_trap_to_sess(netsnmp_session * sess, netsnmp_pdu *template_pdu)
{
    netsnmp_pdu    *pdu;

    if (!sess || !template_pdu)
        return;

    DEBUGMSGTL(("trap", "sending trap type=%d, version=%d\n",
                template_pdu->command, sess->version));

    if (sess->version == SNMP_VERSION_1 &&
        (template_pdu->command == SNMP_MSG_TRAP2 ||
         template_pdu->command == SNMP_MSG_INFORM))
        return;                 /* Skip v1 sinks for v2 only traps */
    template_pdu->version = sess->version;
    pdu = snmp_clone_pdu(template_pdu);
    pdu->sessid = sess->sessid; /* AgentX only ? */
    if (snmp_send(sess, pdu) == 0) {
        snmp_sess_perror("snmpd: send_trap", sess);
        snmp_free_pdu(pdu);
    } else {
        snmp_increment_statistic(STAT_SNMPOUTTRAPS);
        snmp_increment_statistic(STAT_SNMPOUTPKTS);
    }
}

int
create_trap_session(char *sink, u_short sinkport,
                    char *com, int version, int pdutype)
{
    netsnmp_session session, *sesp;
    char           *peername = NULL;

    if ((peername = malloc(strlen(sink) + 4 + 32)) == NULL) {
        return 0;
    } else {
        snprintf(peername, strlen(sink) + 4 + 32, "udp:%s:%hu", sink,
                 sinkport);
    }

    memset(&session, 0, sizeof(netsnmp_session));
    session.peername = peername;
    session.version = version;
    if (com) {
        session.community = (u_char *) com;
        session.community_len = strlen(com);
    }
    sesp = snmp_open(&session);
    free(peername);

    if (sesp) {
        return add_trap_session(sesp, pdutype,
                                (pdutype == SNMP_MSG_INFORM), version);
    }

    /*
     * diagnose snmp_open errors with the input netsnmp_session pointer 
     */
    snmp_sess_perror("snmpd: create_trap_session", &session);
    return 0;
}

int
init_master_agent(int dest_port, 
                  int (*pre_parse) (struct snmp_session *, snmp_ipaddr),
                  int (*post_parse) (struct snmp_session *, struct snmp_pdu *,int))
{
    struct snmp_session sess, *session;

    if ( ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_ROLE) != MASTER_AGENT )
	return 0; /* no error if ! MASTER_AGENT */

    DEBUGMSGTL(("snmpd","installing master agent on port %d\n", dest_port));

    snmp_sess_init( &sess );
    
    sess.version = SNMP_DEFAULT_VERSION;
    sess.peername = SNMP_DEFAULT_PEERNAME;
    sess.community_len = SNMP_DEFAULT_COMMUNITY_LEN;
     
    sess.local_port = dest_port;
    sess.callback = handle_snmp_packet;
    sess.authenticator = NULL;
    sess.flags = ds_get_int(DS_APPLICATION_ID, DS_AGENT_FLAGS);
    session = snmp_open_ex( &sess, pre_parse, 0, post_parse, 0, 0 );

    if ( session == NULL ) {
      /* diagnose snmp_open errors with the input struct snmp_session pointer */
	snmp_sess_perror("init_master_agent", &sess);
		return 1;
    }
    main_session = session;
	return 0;
}

/**
 * Helper for snmp_init
 */
static void open_session_helper(netsnmp_session *local, netsnmp_session **remote)
{
	*remote = snmp_open(local);

	if (!*remote) {
		snmp_sess_perror("SNMP ack", local);
		exit(EXIT_FAILURE);
	}
}

/*
 * send_trap_to_sess: sends a trap to a session but assumes that the
 * pdu is constructed correctly for the session type. 
 */
void
send_trap_to_sess(netsnmp_session * sess, netsnmp_pdu *template_pdu)
{
    netsnmp_pdu    *pdu;
    int            result;
    int            len;


    if (!sess || !template_pdu)
        return;

    DEBUGMSGTL(("trap", "sending trap type=%d, version=%ld\n",
                template_pdu->command, sess->version));

#ifndef NETSNMP_DISABLE_SNMPV1
    if (sess->version == SNMP_VERSION_1 &&
        (template_pdu->command != SNMP_MSG_TRAP))
        return;                 /* Skip v1 sinks for v2 only traps */
    if (sess->version != SNMP_VERSION_1 &&
        (template_pdu->command == SNMP_MSG_TRAP))
        return;                 /* Skip v2+ sinks for v1 only traps */
#endif
    template_pdu->version = sess->version;
    pdu = snmp_clone_pdu(template_pdu);
    pdu->sessid = sess->sessid; /* AgentX only ? */

    if ( template_pdu->command == SNMP_MSG_INFORM
#ifdef USING_AGENTX_PROTOCOL_MODULE
         || template_pdu->command == AGENTX_MSG_NOTIFY
#endif
       ) {
        result =
            snmp_async_send(sess, pdu, &handle_inform_response, NULL);
        
    } else {
        if ((sess->version == SNMP_VERSION_3) &&
                (pdu->command == SNMP_MSG_TRAP2) &&
                (sess->securityEngineIDLen == 0)) {
            u_char          tmp[SPRINT_MAX_LEN];

            len = snmpv3_get_engineID(tmp, sizeof(tmp));
            memdup(&pdu->securityEngineID, tmp, len);
            pdu->securityEngineIDLen = len;
        }

        result = snmp_send(sess, pdu);
    }

    if (result == 0) {
        snmp_sess_perror("snmpd: send_trap", sess);
        snmp_free_pdu(pdu);
    } else {
        snmp_increment_statistic(STAT_SNMPOUTTRAPS);
        snmp_increment_statistic(STAT_SNMPOUTPKTS);
    }
}

/** Write on/off status
*/
double  setMainSwitch(HSNMP m_sessp,float value) {
  struct snmp_pdu* pdu = snmp_pdu_create(SNMP_MSG_SET);    // prepare set-request pdu
  pdu->community = (u_char*)strdup(writeCommunity);
  pdu->community_len = strlen(writeCommunity);

  // for(each SET request to one crate) {
  int v = (int) value;
  snmp_pdu_add_variable(pdu,oidSysMainSwitch,lengthSysMainSwitch,ASN_INTEGER,(u_char*)&v,sizeof(v));
  // } // endfor

  struct snmp_pdu* response;
	int status = snmp_sess_synch_response(m_sessp,pdu,&response);

  /*
  * Process the response.
  */

  if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
    /*
    * SUCCESS: Print the result variables
    */
    struct variable_list *vars;
    
    // debug print
    //for(vars = response->variables; vars; vars = vars->next_variable)
    //  print_variable(vars->name, vars->name_length, vars);

    /* manipuate the information ourselves */
    for(vars = response->variables; vars; vars = vars->next_variable) {
			if (vars->type == ASN_OPAQUE_FLOAT) {				    // 0x78
        value = *vars->val.floatVal;
      }
			else if (vars->type == ASN_OPAQUE_DOUBLE) {			// 0x79
        value = *vars->val.doubleVal;
      }
			else if(vars->type == ASN_INTEGER) {				      // 0x02
				value = (double)*vars->val.integer;
      }
    }
  } else {
    /*
    * FAILURE: print what went wrong!
    */

    if (status == STAT_SUCCESS)
      fprintf(stderr, "Error in packet\nReason: %s\n",
      snmp_errstring(response->errstat));
    else
      snmp_sess_perror("snmpget",snmp_sess_session(m_sessp));
    return 0;
  }
  snmp_free_pdu(response);


  return value;
}

/** Get current from power supply
*/
double getCurrentMeasurement(HSNMP m_sessp, int channel) {
  double value;

  struct snmp_pdu* pdu = snmp_pdu_create(SNMP_MSG_GET);    // prepare get-request pdu

  // for(each GET request to one crate) {
    snmp_add_null_var(pdu,oidOutputMeasurementCurrent[channel],lengthOutputMeasurementCurrent[channel]);   // generate request data
  // } // endfor

  struct snmp_pdu* response;
	int status = snmp_sess_synch_response(m_sessp,pdu,&response);


  /*
  * Process the response.
  */
  if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
    /*
    * SUCCESS: Print the result variables
    */
    struct variable_list *vars;
    
    // debug print
    //for(vars = response->variables; vars; vars = vars->next_variable)
    //  print_variable(vars->name, vars->name_length, vars);

    /* manipuate the information ourselves */
    for(vars = response->variables; vars; vars = vars->next_variable) {
			if (vars->type == ASN_OPAQUE_FLOAT) {				    // 0x78
        value = *vars->val.floatVal;
      }
			else if (vars->type == ASN_OPAQUE_DOUBLE) {			// 0x79
        value = *vars->val.doubleVal;
      }
			else if(vars->type == ASN_INTEGER) {				      // 0x02
				value = (double)*vars->val.integer;
      }
    }
  } else {
    /*
    * FAILURE: print what went wrong!
    */

    if (status == STAT_SUCCESS)
      fprintf(stderr, "Error in packet\nReason: %s\n",
      snmp_errstring(response->errstat));
    else
      snmp_sess_perror("snmpget",snmp_sess_session(m_sessp));
    return 0;
  }
  snmp_free_pdu(response);


  return value;
}

void init_master(void)
{
    struct snmp_session sess, *session;

    if ( ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_ROLE) != MASTER_AGENT )
	return;

    DEBUGMSGTL(("agentx/master","initializing...\n"));
    snmp_sess_init( &sess );
    sess.version  = AGENTX_VERSION_1;
    sess.flags  |= SNMP_FLAGS_STREAM_SOCKET;
    if ( ds_get_string(DS_APPLICATION_ID, DS_AGENT_X_SOCKET) )
	sess.peername = strdup(ds_get_string(DS_APPLICATION_ID, DS_AGENT_X_SOCKET));
    else
	sess.peername = strdup(AGENTX_SOCKET);

    if ( sess.peername[0] == '/' ) {
			/*
			 *  If this is a Unix pathname,
			 *  try and create the directory first.
			 */
	if (mkdirhier(sess.peername, AGENT_DIRECTORY_MODE, 1)) {
	    snmp_log(LOG_ERR,
		"Failed to create the directory for the agentX socket: %s\n",
                 sess.peername);
	}
    }
			/*
			 *  Otherwise, let 'snmp_open' interpret the string.
			 */
    sess.local_port  = AGENTX_PORT;         /* Indicate server & set default port */
    sess.remote_port = 0;
    sess.callback = handle_master_agentx_packet;
    session = snmp_open_ex( &sess, 0, agentx_parse, 0, agentx_build,
                            agentx_check_packet );

    if ( session == NULL && sess.s_errno == EADDRINUSE ) {
		/*
		 * Could be a left-over socket (now deleted)
		 * Try again
		 */
        session = snmp_open_ex( &sess, 0, agentx_parse, 0, agentx_build,
                            agentx_check_packet );
    }

    if ( session == NULL ) {
      /* diagnose snmp_open errors with the input struct snmp_session pointer */
	snmp_sess_perror("init_master", &sess);
        if (!ds_get_boolean(DS_APPLICATION_ID, DS_AGENT_NO_ROOT_ACCESS))
          exit(1);
    }

    DEBUGMSGTL(("agentx/master","initializing...   DONE\n"));
}

// handle err if connection fails
void errHandles(int stat) {
 if (status == STAT_SUCCESS)
        fprintf(stderr, "Error in packet\nReason: %s\n",
                snmp_errstring(response->errstat));
      else if (status == STAT_TIMEOUT)
        fprintf(stderr, "Timeout: No response from %s.\n",
                session.peername);
      else
        snmp_sess_perror("snmpdemoapp", ss);

}

int
create_trap_session(char *sink, u_short sinkport,
                    char *com, int version, int pdutype)
{
    netsnmp_session session, *sesp;
    char           *peername = NULL;
    int             len;

    len = strlen(sink) + 4 + 32;
    if ((peername = malloc(len)) == NULL) {
        return 0;
    } else if (NULL != strchr(sink,':')) {
        snprintf(peername, len, "%s", sink);
    } else {
        snprintf(peername, len, "udp:%s:%hu", sink, sinkport);
    }

    memset(&session, 0, sizeof(netsnmp_session));
    session.peername = peername;
    session.version = version;
    if (com) {
        session.community = (u_char *) com;
        session.community_len = strlen(com);
    }

    /*
     * for informs, set retries to default
     */
    if (SNMP_MSG_INFORM == pdutype) {
        session.timeout = SNMP_DEFAULT_TIMEOUT;
        session.retries = SNMP_DEFAULT_RETRIES;
    }

    /*
     * if the sink is localhost, bind to localhost, to reduce open ports.
     */
    if ((NULL == netsnmp_ds_get_string(NETSNMP_DS_LIBRARY_ID,
                                       NETSNMP_DS_LIB_CLIENT_ADDR)) && 
        ((0 == strcmp("localhost",sink)) || (0 == strcmp("127.0.0.1",sink))))
        session.localname = "localhost";
    sesp = snmp_open(&session);
    free(peername);

    if (sesp) {
        return add_trap_session(sesp, pdutype,
                                (pdutype == SNMP_MSG_INFORM), version);
    }

    /*
     * diagnose snmp_open errors with the input netsnmp_session pointer 
     */
    snmp_sess_perror("snmpd: create_trap_session", &session);
    return 0;
}

netsnmp_variable_list *
collect(netsnmp_session * ss, netsnmp_pdu *pdu,
        oid * base, size_t base_length)
{
    netsnmp_pdu    *response;
    int             running = 1;
    netsnmp_variable_list *saved = NULL, **vlpp = &saved;
    int             status;

    while (running) {
        /*
         * gotta catch em all, gotta catch em all! 
         */
        status = snmp_synch_response(ss, pdu, &response);
        if (status != STAT_SUCCESS || !response) {
            snmp_sess_perror("snmpdf", ss);
            exit(1);
        }
        if (response->errstat != SNMP_ERR_NOERROR) {
	    fprintf(stderr, "snmpdf: Error in packet: %s\n",
                    snmp_errstring(response->errstat));
            exit(1);
        }
        if (response && snmp_oid_compare(response->variables->name,
                                         SNMP_MIN(base_length,
                                                  response->variables->
                                                  name_length), base,
                                         base_length) != 0)
            running = 0;
        else {
            /*
             * get response 
             */
            *vlpp = response->variables;
            (*vlpp)->next_variable = NULL;      /* shouldn't be any, but just in case */

            /*
             * create the next request 
             */
            pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
            snmp_add_null_var(pdu, (*vlpp)->name, (*vlpp)->name_length);

            /*
             * finish loop setup 
             */
            vlpp = &((*vlpp)->next_variable);
            response->variables = NULL; /* ahh, forget about it */
        }
        snmp_free_pdu(response);
    }
    return saved;
}

bool Session::getVariables(const QStringList &oids, QValueVector<QVariant> &retvars, uint32_t &status, int startIndex)
{
	struct snmp_pdu *response = NULL;
	if ( ! m_session )
	{
		status = 0xFFFFFFFF;
		return false;
	}
	
	struct snmp_pdu *pdu = snmp_pdu_create(SNMP_MSG_GET);

	u_long anOID[MAX_OID_LEN];
	
	QStringList::const_iterator it = oids.begin();
	for(int i = 0; i < startIndex; i++) it++; // rough hack, but works
	
	for(int i = 0; it != oids.end() && i < 5; it++, i++ )
	{
		size_t anOID_len = MAX_OID_LEN;
		get_node((*it).latin1(), anOID, &anOID_len);
		snmp_add_null_var(pdu, anOID, anOID_len);
	}
	
	status = snmp_synch_response(m_session, pdu, &response);
	
	//! @todo Error handling should be changed in a more OO way.
	if ( status != STAT_SUCCESS )
	{
		snmp_sess_perror("snmpget", m_session);
		return false;
	}
	
	if ( response->errstat != SNMP_ERR_NOERROR )
	{
		kdWarning() << "Error in packet: " << snmp_errstring(response->errstat) << endl;
		snmp_free_pdu(response);
		return false;
	}

	variable_list *var = response->variables;
	int i = startIndex;
	while( var )
	{
		retvars[i] = snmpvarToVariant(var);
		i++;
		var = var->next_variable;
	}
	
	snmp_free_pdu(response);
	
	return true;
}

SaErrorT snmp_getn_bulk( struct snmp_session *ss, 
		    oid *bulk_objid, 
		    size_t bulk_objid_len,
		    struct snmp_pdu *bulk_pdu, 
		    struct snmp_pdu **bulk_response,
		    int num_repetitions )
{
	int status;
	SaErrorT rtncode = SA_OK;
//        struct variable_list *vars;

	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_synch_response(ss, bulk_pdu, bulk_response);

	/*
	 * Process the response.
	*/
#if 0
	if (status == STAT_SUCCESS) {
		vars = (*bulk_response)->variables;
		if ((*bulk_response)->errstat == SNMP_ERR_NOERROR) {
			if (!CHECH_END(vars->type)) {
                                /* This is one of the exception condition */
				rtncode = SA_ERR_HPI_NOT_PRESENT;
				dbg("snmp exception %d \n",vars->type);
			}
		} else {
			fprintf(stderr, "Error in packet %s\nReason: %s\n",
					(char *)bulk_objid, snmp_errstring((*bulk_response)->errstat));
			if ((*bulk_response)->errstat == SNMP_ERR_NOSUCHNAME)
					(*bulk_response)->errstat = SNMP_NOSUCHOBJECT;
			rtncode = (SaErrorT) (SA_ERR_SNMP_BASE - (*bulk_response)->errstat);
		}
	} else {
		snmp_sess_perror("snmpset", ss);
		rtncode = (SaErrorT) (SA_ERR_SNMP_BASE - status);
	}
#endif
	return(rtncode);

}

SaErrorT net_snmp_failure(struct snmp_client_hnd *custom_handle, int snmp_status, 
				 struct snmp_pdu *response)
{
	if (snmp_status == STAT_SUCCESS) {
		dbg("Error in packet, Whilst getting Resources\nReason: %s", 
		    snmp_errstring(response->errstat));
		dbg("ERROR: net_snmp_failure %s", 
		    snmp_errstring(response->errstat));
	} else	{
		snmp_sess_perror("snmpget", custom_handle->ss);
		dbg("ERROR: net_snmp_failure");
	}

	return(SA_ERR_HPI_ERROR);
}