mimecheck(1) Check MIME attachments mimecheck(1)
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 appli-
cation/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).
COPYRIGHT
2007 SuSE LINUX Products GmbH, Nuernberg, Germany,
2007 Werner Fink.
AUTHORS
Werner Fink <werner@suse.de>.
3rd Berkeley Distribution Juni 28, 2007 mimecheck(1)