Installing the Natural Web I/O Interface Server CICS Adapter under z/OS

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# Installing the Natural Web I/O Interface Server CICS Adapter under z/OS

This document describes how to install the CICS connection for a Natural Web I/O Interface server (product code NWO) running under z/OS in batch mode.

The following topics are covered:

- Prerequisites

- Installation Procedure

## Prerequisites

For details, refer to the section Prerequisites.

## Installation Procedure

To install the Natural Web I/O Interface Server CICS Adapter, perform the following steps:

### Step 1: Customize CICS

(Job I005, Steps 9405, 9406, 9410, 9411)

The Natural Web I/O Interface server load library must be defined in the CICS `DFHRPL` concatenation.

The CICS TCP/IP environment can be customized using the configuration macro `EZACICD` in the `EZACONFG` configuration data set or the configuration transaction `EZAC`. This section describes the usage of the transaction `EZAC`.

Customize the standard listener `CSKL` of the CICS socket interface using the CICS transaction `EZAC,ALTER,LISTENER` and, on the second screen, define `NATUXRFE` in the `SECEXIT`.

For impersonation with pass phrases an enhanced listener is required. Customize an existing enhanced listener or define a new one using the CICS transaction `EZAC,DEFINE,LISTENER` with `TRANID CSEL` (or another name of your choice) and `FORMAT ENHANCED`. Customize this enhanced listener by altering the settings on the second screen as follows:

    CSTRANid     ===> NRFE
    CSSTTYPe     ===> KC
    CSDELAY      ===> 000000
    MSGLENgth    ===> 000
    PEEKDATa     ===> NO
    MSGFORMat    ===> EBCDIC
    USEREXIT     ===> NATUXRFE
    GETTID       ===> NO
    USERID       ===>

The definition of `SECEXIT=NATUXRFE` is mandatory when an enhanced listener is used or when the Natural Web I/O Interface server is started with impersonation (parameter `SECURITY_MODE`).

Start the listener using the CICS transaction `EZAO`.

Specify `AF=INET6` if IPv6 (Internet Protocol Version 6) is to be used.

Note
Using IPv6 is only possible with Natural Web I/O Interface Server Version 8.3.2 or above

The following CICS resource definitions are required:

1. Define the CICS transaction for the remote front-end. This transaction name is an arbitrary name which must be defined in the NWO configuration parameter `RFE_CICS_TA_NAME`. This document uses the transaction name `NRFE`.

       DEFINE TRANSACTION(NRFE) GROUP(NWOgroup)
       PROGRAM(NATCNRFE)
       TWASIZE(128)
       RESTART(NO)
       TASKDATAKEY(USER)
       TASKDATALOC(ANY)

2. Define the programs `NATCNRFE`, `NATLRGWO` and `NATUXRFE`:

       DEFINE PROGRAM(NATCNRFE) GROUP(NWOgroup)
       LANGUAGE(C) DATALOCATION(ANY) EXECKEY(USER)

       DEFINE PROGRAM(NATLRGWO) GROUP(NWOgroup)
       LANGUAGE(C) DATALOCATION(ANY) EXECKEY(USER)

       DEFINE PROGRAM(NATUXRFE) GROUP(NWOgroup)
       LANGUAGE(LE370) DATALOCATION(ANY) EXECKEY(CICS)

   `NATUXRFE` must be defined with `EXECKEY(CICS)` because the transaction `CSKL` is defined with `TASKDATAKEY(CICS)` and the program `NATUXRFE` is part of the calling chain initiated by `CSKL`. This also applies if another transaction defined with `TASKDATAKEY(CICS)` is used to invoke `NATUXRFE`.

   In addition, when using the CICS open transaction environment (OTE), set the following parameters for `NATCNRFE` and `NATUXRFE`:

       API(OPENAPI)
       CONCURRENCY(THREADSAFE)

   This is required, for example, if the parameter `OTE=YES` is set for the configuration macro `EZACICD` with `TYPE=CICS` for the CICS region, or if the parameter is set with the transaction `EZAC,ALTER,CICS`.

   The values of `API`, `CONCURRENCY` and `EXECKEY` for `NATCNRFE` must be the same as for the environment-dependent nucleus of Natural because Natural is called by `NATCNRFE` using standard linkage conventions (direct branch using a BASR instruction) instead of an `EXEC CICS LINK` command.

   You need not adapt the program definition of `NATLRGWO` for the CICS OTE.

3. For DB2 access, a DB2 plan name must be defined. If you have not specified a DB2 plan name for pool threads in the `DB2CONN` resource definition, the transaction specified in `RFE_CICS_TA_NAME` and its associated DB2 plan name must be defined to CICS with a `DB2TRAN` and/or `DB2ENTRY` resource definition.

   Note
   The dynamic plan selection provided by the Natural for DB2 interface must not be used.

4. For DB2 access, the authorization ID under which the NWO CICS transaction is accessing DB2 must have the necessary privileges for DB2 access. The authorization ID to be used is specified in the `DB2ENTRY` resource definition. If you choose the `USERID` option, the user ID of the CICS system will be used because the NWO CICS transactions are running under the user ID of the CICS system.

The sample JCL containing the following members defines all necessary CICS entries:

NWOCONF

### Step 2: Create member for CICS server

Job I009, Step 9411, create member `NWOCONFC` for CICS server

### Step 3: Link the object modules into the NWO load library

(Job I054, Step 8420)

The NWO object modules must be linked with the necessary runtime extensions of your CICS installations into executable load modules.

See sample job `NWOI054` on data set `NWOvrs.JOBS`.

### Step 4: Create startup procedure

Job I200, Step 9416, create startup procedure for CICS server

### Step 5: Customize the Natural Web I/O Interface Server

In order to dispatch the NWO Natural sessions in CICS, you must adapt the configuration file of your Natural Web I/O Interface server running under z/OS in batch mode. For this purpose, two sample JCL members (`NWOI009C` and `NWOCONFC`) are available.

Refer to Configuring the Natural Web I/O Interface Server CICS Adapter and to Configuring the Natural Web I/O Interface Server.

### On this page

- Prerequisites
- Installation Procedure