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mimecheck(1)

Version 0.42

metamail

MIME Mail Handler

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.

COPYRIGHT

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

AUTHORS

Werner Fink <>.
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