The -2 <filename> option on the command line of selfserv:
What use case is the fdx connection addressing? It looks like it's dealing with reading and writing a big file?
As you know, SSL is very commonly used with HTTP, and HTTP is a half-duplex
(HDX, two way alternate) protocol. But the SSL protocol itself is not
limited to being used only with half-duplex appliction protocols.
SSL will also work with full-duplex (FDX, two way simultaneous) application protocols.
Selfserv and strsclnt are intended to be able to test FDX as well as HDX use of SSL. When testing HDX (the default), strsclnt and selfserv act as https client and server. When testing FDX, they merely send each other file content simultaneously.
> Also, any idea why the function handle_fdx_connection() is not used?
I don't know. Here is some speculation. Our QA test scripts do not test
the FDX mode of operation, and it is not frequently used. It is possible
that the FDX code has experienced "bit rot", meaning that some source code modification has had the unintended side effect of disabling FDX code.
-- Nelson B
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