mimecheck

Langue: en

Version: Juni 28, 2007 (openSuse - 09/10/07)

Section: 1 (Commandes utilisateur)

Sommaire

NAME

mimecheck - determine the type of the MIME encoded of an attachment
mimezip - detect the type of MIME encoded zip archive in an attachment
mimebzip - detect the type of MIME encoded bzip2 data in an attachment
mimegzip - detect the type of MIME encoded gzip data in an attachment

SYNOPSIS

mimecheck boundary [file]
mimezip boundary [file]
mimebzip boundary [file]
mimegzip boundary [file]

DESCRIPTION

The scripts mimecheck, mimezip, mimebzip, and mimegzip can be used to determine the contents of MIME encoded attachments of the type application/octet-stream. The scripts require the boundary as provided in the headers and/or bodys of mails with enclosed attachments. The scripts read from standard input if no file was provided and write out the detected MIME type to standard out.

EXAMPLE

A short filter rule used by procmail(1) to check for DOS executables in MIME encoded zip archives found in many attachments: 

BLANK="[        ]+"

TYPE="${BLANK}multipart/(alternative|mixed)"



:0

* $ ^Content-Type:${TYPE};(${BLANK}|$)*boundary=[\"']?/[^ \"';]+

{

        BOUNDARY="${MATCH}"

        TYPE=""



        :0 B

        * $ ^Content-Transfer-Encoding:${BLANK}base64

        {

                TYPE=`mimecheck ${BOUNDARY}`



                :0

                * TYPE ?? application/x-zip

                {

                        TYPE=`mimezip ${BOUNDARY}`

                }

        }



        :0

        * TYPE ?? executable.*DOS

        * TYPE ?? DOS.*executable

        /dev/null

}

there is no guarantee that this piece of a procmailrc(5) file will work.

SEE ALSO

procmailrc(5), file(1), sed(1), mimencode(1). 2007 SuSE LINUX Products GmbH, Nuernberg, Germany,
2007 Werner Fink.

AUTHORS

Werner Fink <werner@suse.de>.