Date: Thu, 9 Jun 2011 17:57:16 -0400 From: Robert Simmons <rsimmons0@gmail.com> To: freebsd-fs@freebsd.org Subject: Re: Getting access to checksums. Message-ID: <BANLkTim4=rvn=2A9N=_wx3y3YrHA3sqyWA@mail.gmail.com> In-Reply-To: <4DF11BB8.5030805@dannysplace.net> References: <4DF11BB8.5030805@dannysplace.net>
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On Thu, Jun 9, 2011 at 3:15 PM, Dan Carroll <fbsd@dannysplace.net> wrote: > I'm currently working on a system that monitors file changes. > I'd like to calculate the checksums on each file both to see if a change has > occured as well as looking for duplicate files. > > I'm not sure what algorithm I'll end up using but I was wondering if it was > possible to get access to ZFS' checksumming? > Does it happen on a file level or is it block level only? And if it does, > is there an easy way to obtain this information from the system? You may not want to reinvent the wheel. There are quite a few ports that do what you want, more or less. You may want to start there, and if they don't serve your purpose, then maybe do it the hard way. ;) The main one is the famous Tripwire: http://www.freebsd.org/cgi/url.cgi?ports/security/tripwire/pkg-descr http://www.freebsd.org/cgi/url.cgi?ports/security/tripwire12/pkg-descr http://www.freebsd.org/cgi/url.cgi?ports/security/tripwire-131/pkg-descr Then there are some replacements for Tripwire that you may want to look at as well: http://www.freebsd.org/cgi/url.cgi?ports/security/aide/pkg-descr http://www.freebsd.org/cgi/url.cgi?ports/security/yafic/pkg-descr Also, if you really want to roll your own, just write a script and use the built-in checksum utilities: http://www.freebsd.org/cgi/man.cgi?query=sha256&apropos=0&sektion=0&manpath=FreeBSD+8.2-RELEASE&format=html And find(1): http://www.freebsd.org/cgi/man.cgi?query=find&apropos=0&sektion=0&manpath=FreeBSD+8.2-RELEASE&format=html
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