About PCAS Access Control

["张玉亮" <zhangyl@ihep.ac.cn>]

Hi all,

 

Here is my question. I want to add  access control to my PCAS, but I do not  know what the pUserName and pHostName in the following function refer to clearly.

virtual casChannel *createChannel ( const casCtx &ctx,const char * const pUserName,const char * const pHostName);

In "Channel Access Protable Server API Tutorial" it said that points to a string representing the user's name and  pHostName points to a string representing the server tool's host. For example, I have two EDM clients application run on the same linux PC, does the user's name refer to the PC name or something else.

 

I have implemented the createChannel function and  writeAccess function like this:

 

casChannel *exPV::createChannel ( const casCtx &ctx,

        const char * const  /*pUserName*/, 

        const char * const  /*pHostName*/)

{

    return new exChannel ( ctx,"zhangyul","Administrator");

}

///////////////////////////////////////////////////////////////////

bool exChannel::writeAccess () const

{

      if (strcmp(User.string(), "zhangyul") == 0)

return aitFalse;

      else

return aitTrue;

}

 

However, I found that any client could not write the PCAS's PV, I think my understanding is totally wrong about user's name and the host name!!

 

Thank you!

 

Zhang Yuliang