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  2. RPG400-L
  3. March 2005

Re: Sockets in RPGLE


Hello,

How I can retrieve the IP adress of my AS400 in a ILE RPG  program ? .
This ILE RPG program is an Socket Program. The I want to recover the IP of
any PC that is connected at the AS400.

I'm not precisely sure what you're asking, so I'll answer everything that I think you COULD mean...

Do you want to know the IP address of both the AS/400 and the PC that's connected to it while a socket connection is active? Is that what you're asking? Or are you asking something else?

You can find out the "local" (AS/400) IP address of the connected socket by calling the getsockname() API.

You can find out the "remote" (PC) IP address of the connected socket by calling the getpeername() API.

Once you've received the IP address using one of these methods, you can convert it to a human readable ("dotted") address with the inet_ntoa() API. You can also use gethostbyaddr() to look up a domain name for the IP address.

The accept() API will also return the "remote" IP address as soon as the connection is established if your program is a server program. This is the same information that getpeername() returns, and can be used in the same way.

If you want to know this information before the connection has been established, you can find out the IP address of a connected TN5250 client using the QDCRDEVD API with format DEVD0600 (search the Midrange.com archives for examples of this)

You can also look up an IP address via DNS using the gethostbyname() API or the various resolver APIs. (gethostbyname() is much simpler, and will also check the HOSTS file. the resolver APIs are complicated, but can do more sophisticated lookups including checking for different RR types.)

Hope that helps...

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