Re: FreeBSD listen()

[davids () WEBMASTER COM (David Schwartz)]

> Hello David Schwartz,
>
> 29.10.1999 0:13, you wrote: FreeBSD listen();
>
>
> D>         It makes no sense at all to use the listen backlog as
> any sort of security
> D> mechanism. If you only wish to accept one connection, only
> call 'accept'
> D> once.
>
> accept()   just  allocates  socket  for  connection  that  is  already
> established and removes this connection from queue. It works just like
> getchar()  works  with  keyboard  input.  Calling  accept once doesn't
> assumes  you  that  only  one connection is established - like calling
> getchar()  once doesn't assumes you that only one symbol is entered by
> user.

        So? What good does it do to complete a TCP connection if no data will be
passed through it?

> D>         This is about active versus passive FTP. It has
> nothing to do with listen
> D> backlogs or connection counts.
>
> It works in FreeBSD just because of this problem.

        That's nonsense. The listen backlog cannot be used as a security mechanism
on any platform that I know of.

        DS