nslogging.c

snmp的源代码,已经在我的ubuntu下编译通过

                if ( request->requestvb->type != ASN_INTEGER ) {
                    netsnmp_set_request_error(reqinfo, request, SNMP_ERR_WRONGTYPE);
                    return SNMP_ERR_WRONGTYPE;
                }
		switch ( *request->requestvb->val.integer ) {
                case RS_ACTIVE:
                case RS_NOTINSERVICE:
                    /*
		     * Can only work on existing rows
		     */
                    if (!logh) {
                        netsnmp_set_request_error(reqinfo, request,
                                                  SNMP_ERR_INCONSISTENTVALUE);
                        return SNMP_ERR_INCONSISTENTVALUE;
                    }
	            break;

                case RS_CREATEANDWAIT:
                case RS_CREATEANDGO:
                    /*
		     * Can only work with new rows
		     */
                    if (logh) {
                        netsnmp_set_request_error(reqinfo, request,
                                                  SNMP_ERR_INCONSISTENTVALUE);
                        return SNMP_ERR_INCONSISTENTVALUE;
                    }

                    /*
                     *  Normally, we'd create the row at a later stage
                     *   (probably during the RESERVE2 or ACTION passes)
                     *
                     *  But we need to check that the values are
                     *   consistent during the ACTION pass (which is the
                     *   latest that an error can be safely handled),
                     *   so the values all need to be set up before this
                     *      (i.e. during the RESERVE2 pass)
                     *  So the new row needs to be created before that
                     *   in order to have somewhere to put them.
                     *
                     *  That's why we're doing this here.
                     */
                    idx = table_info->indexes;
	            logh = netsnmp_register_loghandler(
				    /* not really, but we need a valid type */
				    NETSNMP_LOGHANDLER_STDOUT,
				    *idx->val.integer);
                    if (!logh) {
                        netsnmp_set_request_error(reqinfo, request,
                                                  SNMP_ERR_GENERR); /* ??? */
                        return SNMP_ERR_GENERR;
                    }
                    idx = idx->next_variable;
	            logh->type  = 0;
	            logh->token = strdup(idx->val.string);
                    netsnmp_insert_iterator_context(request, (void*)logh);
	            break;

                case RS_DESTROY:
                    /*
		     * Can work with new or existing rows
		     */
                    break;

                case RS_NOTREADY:
		default:
                    netsnmp_set_request_error(reqinfo, request,
                                              SNMP_ERR_WRONGVALUE);
                    return SNMP_ERR_WRONGVALUE;
                }
                break;

            default:
                netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHOBJECT);
                return SNMP_NOSUCHOBJECT;
                continue;
	    }
	}
	break;


    case MODE_SET_RESERVE2:
        for (request=requests; request; request=request->next) {
            if ( request->status != 0 ) {
                return SNMP_ERR_NOERROR;	/* Already got an error */
            }
            logh = (netsnmp_log_handler*)netsnmp_extract_iterator_context(request);
            table_info  =                 netsnmp_extract_table_info(request);

            switch (table_info->colnum) {
            case NSLOGGING_TYPE:
                /*
		 * If we're creating a row using createAndGo,
		 * we need to set the type early, so that we
		 * can validate it in the ACTION pass.
		 *
		 * Remember that we need to be able to reverse this
		 */
                if ( logh )
                    logh->type = *request->requestvb->val.integer;
	        break;
            /*
	     * Don't need to handle nsLogToken or nsLogStatus in this pass
	     */
	    }
	}
	break;

    case MODE_SET_ACTION:
        for (request=requests; request; request=request->next) {
            if (requests->processed != 0)
                continue;
            if ( request->status != 0 ) {
                return SNMP_ERR_NOERROR;	/* Already got an error */
            }
            logh = (netsnmp_log_handler*)netsnmp_extract_iterator_context(request);
            table_info  =                 netsnmp_extract_table_info(request);

            switch (table_info->colnum) {
            case NSLOGGING_STATUS:
                /*
		 * This is where we can check the internal consistency
		 * of the request.  Basically, for a row to be marked
		 * 'active', then there needs to be a valid type value.
		 */
		switch ( *request->requestvb->val.integer ) {
                case RS_ACTIVE:
                case RS_CREATEANDGO:
                    if ( !logh->type ) {
                        netsnmp_set_request_error(reqinfo, request,
                                                  SNMP_ERR_INCONSISTENTVALUE);
                        return SNMP_ERR_INCONSISTENTVALUE;
		    }
	            break;
		}
	        break;
            /*
	     * Don't need to handle nsLogToken or nsLogType in this pass
	     */
	    }
	}
	break;

    case MODE_SET_FREE:
    case MODE_SET_UNDO:
        /*
         * If any resources were allocated in either of the
         *  two RESERVE passes, they need to be released here,
         *  and any assignments (in RESERVE2) reversed.
         *
         * Nothing additional will have been done during ACTION
         *  so this same code can do for UNDO as well.
         */
        for (request=requests; request; request=request->next) {
            if (requests->processed != 0)
                continue;
            logh = (netsnmp_log_handler*)netsnmp_extract_iterator_context(request);
            table_info  =                 netsnmp_extract_table_info(request);

            switch (table_info->colnum) {
            case NSLOGGING_TYPE:
                /*
		 * If we've been setting the type, and the request
		 * has failed, then revert to an unset type.
		 *
		 * We need to be careful here - if the reason it failed is
		 *  that the type was already set, then we shouldn't "undo"
		 *  the assignment (since it won't actually have been made).
		 *
		 * Check the current value against the 'new' one.  If they're
		 * the same, then this is probably a successful assignment,
		 * and the failure was elsewhere, so we need to undo it.
		 *  (Or else there was an attempt to write the same value!)
		 */
                if ( logh && logh->type == *request->requestvb->val.integer )
                    logh->type = 0;
	        break;

            case NSLOGGING_STATUS:
                temp = *request->requestvb->val.integer;
                if ( logh && ( temp == RS_CREATEANDGO ||
                               temp == RS_CREATEANDWAIT)) {
		    netsnmp_remove_loghandler( logh );
		}
	        break;
            /*
	     * Don't need to handle nsLogToken in this pass
	     */
	    }
	}
	break;


    case MODE_SET_COMMIT:
        for (request=requests; request; request=request->next) {
            if (requests->processed != 0)
                continue;
            if ( request->status != 0 ) {
                return SNMP_ERR_NOERROR;	/* Already got an error */
            }
            logh = (netsnmp_log_handler*)netsnmp_extract_iterator_context(request);
            if (!logh) {
                netsnmp_set_request_error(reqinfo, request, SNMP_ERR_COMMITFAILED);
                return SNMP_ERR_COMMITFAILED;	/* Shouldn't happen! */
            }
            table_info  =                 netsnmp_extract_table_info(request);

            switch (table_info->colnum) {
            case NSLOGGING_MAXLEVEL:
                logh->pri_max = *request->requestvb->val.integer;
	        break;

            case NSLOGGING_STATUS:
                switch (*request->requestvb->val.integer) {
                    case RS_ACTIVE:
                    case RS_CREATEANDGO:
                        logh->enabled = 1;
                        break;
                    case RS_NOTINSERVICE:
                    case RS_CREATEANDWAIT:
                        logh->enabled = 0;
                        break;
		    case RS_DESTROY:
		        netsnmp_remove_loghandler( logh );
                        break;
		}
	        break;
	    }
	}
	break;
    }

    return SNMP_ERR_NOERROR;
}