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OS/2 Collection - Online Library - January 1996
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CHAPTER.09
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README.TXT
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1993-10-28
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This is an example for a client/server application using the CDS namespace
and the security service of DCE. It is part of the IBM redbook
DEVELOPING DCE APPLICATION FOR OS/2 AND AIX (GG24-4090)
It implements a simple distributed message queuing system.
PREREQUISITES:
RS/6000 ! PS/2
---------------------------------------------
- AIX/6000 3.2 ! - OS/2 2.1
- DCE/6000 1.01 ! - CSET 1.0
! - TOOLKIT 2.1
! - DCE OS/2
FILES:
README this file.
Makefile.aix makefile for AIX
Makefile.os2 makefile for OS/2
mbox.idl IDL interface description
mbox.acf attribute configuration file
client.c client part
server.c server main module
manager.c server manager module
security.c server security checking module
common.h common header file
os2.def linker definition file for OS/2
COMPILING:
AIX: make -f Makefile.aix
OS/2: nmake -f Makefile.os2
SETUP SERVER:
1) Login as root and authenticate as cell_admin.
2) Create a principal called MessageBox with rgy_edit.
3) Create an account for MessageBox valid for login and
group subsys/dce/cds-server. This group implies the
right to write to the CDS namespace.
4) Create a directory in the CDS name space with the
cdscp command:
cdscp add directory /.:/Servers
5) On the machine wich runs the server application 'mbox'
export the password for the account MessageBox to the
local default keytab file. Be sure the the password is
the same as specified for the account.
# rgy_edit
Current site is: registry server at /.:/subsys/dce/sec/master
rgy_edit==> ktadd -p MessageBox
Enter password:xxxxxxx
Re-enter password to verify:xxxxxxx
rgy_edit==> exit
bye.
6) Authenticate as MessageBox and become root.
7) Run the server application:
# mbox
Wait for the message:
.......
Server /.:/Servers/MessageBox listening.
If you rerun the server you only have to perform step 6) and 7). If you
choose to run the server on a different machine additinal you have to
export the password to the local keytab file (step 5).
CLIENT USAGE:
AIX: message [-c] [principal] [Message ...]
OS/2: message [/c] [principal] [Message ...]
The client application 'message' provides the user interface for the simple
message queuing system. Without any arguments it look for the oldest message
for your principal. If there is a message waiting for you it prints the
message and discards it.
If you want to send a message just type principal name and the message in the
commandline of the client.
Only a principal with control rights on the CDS name space entry
/.:/Servers/MessageBox
can use the option 'c' to create a new message box for the principal given
on the commandline. If you are authenticated as the principal MessageBox,
you will have the control right on the entry /.:/Servers/MessageBox because
MessageBox is the owner of this entry. But you can change the ACLs on that
entry to provide access to the create option for other principals.