[Bug 2579] New: Link count support

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2579

            Bug ID: 2579
           Summary: Link count support
           Product: Portable OpenSSH
           Version: 7.2p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: sftp-server
          Assignee: unassigned-bugs at mindrot.org
          Reporter: rian at thelig.ht

Created attachment 2820
  --> https://bugzilla.mindrot.org/attachment.cgi?id=2820&action=edit
Patch

This patch adds client and server support for transmitting the st_nlink
field
across SSH2_FXP_NAME and SSH2_FXP_ATTRS responses.

One downside is that it adds this much new overhead for those
responses:

sizeof(uint32_t) + sizeof(uint32_t) +
strlen("attr-link-count at openssh.com") + sizeof(uint32_t) +
sizeof(uint64_t)

i.e. 47 bytes.

If this overhead is not acceptable, perhaps this extension can only be
enabled if the client sends the "attr-link-count at openssh.com" extension
in the SSH2_FXP_INIT request. If this is the case, should sftp-client
advertise this extension by default or no?

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