[scponly] sftp-server arguments

[SCP Only]

Newer versions of OpenSSH sftp-server support the "-u" option for setting
the umask.

However, when trying this with scponly, it gave me some errors along the
lines of

May 11 17:22:10 server scponly[24102]: an unrecognized option was
encountered while processing cmd /usr/libexec/openssh/sftp-
server (arg was <NULL>) (username: testuser(502), IP/port: 192.168.1.83
54666 22))
May 11 17:22:10 server scponly[24102]: requested command
(/usr/libexec/openssh/sftp-server -f LOCAL6 -l VERBOSE -u 0002) tried to use
disallowed argument (username: testuser(502), IP/port: 192.168.1.83 54666
22))

I was able to solve this by modifying scponly.c and adding the option to the
allowed arguments

#ifdef ENABLE_SFTP
        { PROG_SFTP_SERVER,     1,
1,                              NULL,
"f:l:u:",                       empty_longopts },
#endif

Is there a reason this is disallowed by default?

- Amir
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