mimecheck

mimecheck

NAME
SYNOPSIS
DESCRIPTION
EXAMPLE
SEE ALSO
COPYRIGHT
AUTHORS

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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).

COPYRIGHT

2007 SuSE LINUX Products GmbH, Nuernberg, Germany,
2007 Werner Fink.

AUTHORS

Werner Fink <werner@suse.de>.

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