Safe Guile?

[Olivier Buechel <Olivier dot Buechel at unifr dot ch>]

In order to discuss/argue about secure scheme, knotwell wrote a workaround 
by using a smtplib:sendmail command. Does anybody know how I can get
access to this packages. I looked at schemers.org and at
http://www.cs.indiana.edu/scheme-repository/ but couldn`t find a such
packages. 
And then the question about secure scheme seems to me not to be solved 
by just overloading names. Anybody has a clue how to secure scheme?

>>>>> "knotwell" == knotwell  <knotwell@f5.com> writes:

    knotwell> You cauld also redefine the system calls to report
    knotwell> attempts at unauthorized calls:

    knotwell> (define open-input-file (filename) (begin
    knotwell> (smtplib:sendmail "root@localhost" (string-append
    knotwell> "syscall: open-input-file attempted by " (array-ref
    knotwell> (getpwuid (getuid)) 0))) (error 'syscall-denied
    knotwell> "open-input-file prohibited")))
    knotwell> --Brad

    knotwell> Warlander, Johan writes:
    >> Hello,
    >> server etc. What I would like to know is if there is any way to
    >> 'secure' Guile so that you can run Scheme code that doesn't
    >> have access to the system functions, but that can still use all
    >> the other functionality. The preferrable solution would be if
    >> each character script could run with its own 'environment', so
    >> that a script can't mess up for the rest of the game, but even
    >> if that isn't possible, just being able to 'turn off' the
    >> system functions would be great.
    >> 
    >> Any thoughts on the matter appreciated, Johan Wärlander