Bug#564772: libjavascript-perl: Segfaults with wpad extraction code

[Niko Tyni]

On Mon, Jan 11, 2010 at 10:07:41PM +0100, Petter Reinholdtsen wrote:
> Package:  libjavascript-perl

> For etch, I wrote a script to extract the proxy setting from a WPAD
> script to be able to update /etc/environment at boot.  When trying to
> use it with Debian Edu based on Lenny, the script fail and perl
> segfaults.  I hope this bug can be fixed in Lenny, because we are
> working on finalizing the Lenny based Debian Edu and it would be great
> if we could get this working using Lenny packages, as we are moving to
> using a WPAD file to specify the proxy setting.
> 
> I had to disable the setting of the error handler, as this function
> seem to be missing in the Lenny package.

Using just 'die $@ if $@' for that shows the actual problem:

dnsResolve is not defined at main line 94 in 41

I suppose the old Etch javascript library exposed a dnsResolve() function
but the newer ones don't. I suspect this is not a bug.

It seems to work for me if I supply a dnsResolve() implementation before
the "$cx->eval(get_pac_functions())" line:

    use Socket; # for inet_ntoa
    $cx->bind_function(name => "dnsResolve", func => sub {
        my $name = shift;
        my $packed = gethostbyname($name);
        return $packed ? inet_ntoa($packed) : undef;
    });

This is obviously not IPv6 compatible etc. but it's a start.

I haven't really investigated the segfault: given that there's an error
indicator before it happens and that it's fixed in sid, I don't think
it's worth the effort trying to fix it in lenny. YMMV of course.

Hope this helps,
-- 
Niko Tyni   ntyni at debian.org