dncopy : binary filesize becomes multiples of 512 bytes

[Nicolas MEYER]

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UBUNTU 10.04 LTS
DNPROGS 2.49 and DNPROGS 2.61 (compiled source package)

Expected :
-----------
dncopy -mblock -b512 FromLINUX_file1 ToVMS_file1
dncopy -mblock -b512 FromVMS_file1 ToLinux_file2
should give EXACTLY the same file.....

What happen :
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ToLinux_file2 is greater than FromLINUX_file1.
ToVMS_file1 becomes multiples of 512 bytes !

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We need to copy binary files exactly to its size, in both direction (Linux->VMS) or (VMS->Linux).
From VMS to Linux is OK, but,
From Linux to VMS is wrong !
From Linux to VMS is wrong, we found that the transferred files are a little bigger (they become multiples of 512 bytes).

The problem is the same with the “Linux fal service” as with the “dncopy” command.

dndir command example :
- dndir -mblock -b512 ‘nodename”user password”::[]file2.bin .
- dndir -mblock -b512 linuxbinaryfile.bin ‘nodename”user password”::[]file1.bin

fal parameters
                /etc/dnetd.conf :
                               FAL 17 Y none fal -ae –f /etc/dnetd.conf.fal
                /etc/dnetd.conf.fal
                               .bin b 512
                               .exe b 512
                               .txt r
                    etc…
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Example with a test file that contains 43251 characters = “84 sectors + 243 bytes” : zi_43215.bin
(On VMS hardware) dump /header zi_43215.bin
…
                Structure level and version 2, 1
…
                Record type : Fixed
                File organization : Sequential
                Record attributes : <none spefified>
                Record size : 512
                Highest block : 90
                End of file block : 85
                End of file byte : 243
                Bucket size : 0
                Fixed control area size : 0
                Etc…

dncopy -mblock -b512 ‘nodename”user password”::ZI_43251.BIN .
ls –l
    -rw-r—r-- 1 user user zi_43251 2017-11-13 17:54 zi_43251.bin
(It is OK)

// I delete the file on VMS, than I do :
dncopy -mblock -b512 zi_43251.bin ‘nodename”user password”::ZI_43251.BIN

(On VMS hardware) dump/header zi_43215.bin
…
                Structure level and version 2, 1
…
                Record type : Fixed
                File organization : Sequential
                Record attributes : <none spefified>
                Record size : 512
                Highest block : 90
                End of file block : 86
                End of file byte : 0
                Bucket size : 0
                Fixed control area size : 0
                Etc…
(It is WRONG)
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We tried to understand and correct the problem, but without success !

Is it a bug or a limitation ?
Perhaps we make mistakes in parameters usage ?

Do you know if there is a workaround or fix ?