On 2020-08-27 23:42, Andreas via fpc-pascal wrote:
Hello Andreas,
I would like to use TCP in a DOS FPC project. I see in go32-v2
download page under "Optional-Files" the unit ufclndos. I downloaded
it but have not managed to find any documentation for it.
Well, the source file should provide at least basic idea. If you have a
look at the source file of unit sslbase, i.e. the only unit from package
fcl-net compiled for GO32v2, you can find that this unit provides just
basis for classes for SSL support, however the implementation is dummy
and needs to be replaced with the real one in a descendants of the
classes defined there (that's also the reason why this unit is compiled
for GO32v2 as well - it contains nothing specific to any platform and
thus may be compiled for any FPC supported target). The descendants are
provided in unit sslsockets, but this unit is _not_ provided for GO32v2.
The reason is that this unit depends on unit sockets (which is the unit
providing the real TCP/IP communication support). However,
implementation of that unit for GO32v2 doesn't exist. In other words -
as it stands now, this package isn't very useful for the GO32v2 target.
1) Is there any documentation for this unit?
Not that I'd be aware of. However, this particular unit isn't very
useful by itself (for any FPC target).
2) Can this unit be used to create a server for a TCP connection?
No, see above. You'd need to have unit sockets implemented first.
Moreover, SSL support would need a port of the OpenSSL library to
GO32v2. This library is being loaded dynamically on targets currently
supported by the respective FPC unit (openssl.pas included in FPC
package openssl), but a potential port to GO32v2 would probably need to
be linked statically (i.e. support for static linking of this library
would need to be added to that unit).
3) How does the unit "talk" with the 16-bit DOS packet driver?
It doesn't. Somebody would need to provide an implementation of unit
sockets for GO32v2 first, then the implementation for unit openssl (if
you intend to use encrypted communication). Unit sockets would already
allow implementing simple client/server communication. There are more
advanced units provided with FPC (e.g. in package fcl-web), but these
have additional dependencies - i.e. additional units would need to be
adapted for the GO32v2 target first (e.g. ssockets). All of this isn't
supported for target GO32v2 at the moment.
Tomas
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