mimecheck(1)

📦 version 2.7.19, in opensuse-leap 16.0

🌸 NAME 🌸

okay so bestie, this is mimecheck(1) — the Check MIME attachments manual — and it's giving a whole little squad of scripts. They all do the “what is this attachment actually?” thing:

  • 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 💅

bestie. The scripts mimecheck, mimezip, mimebzip, and mimegzip can be used to determine the contents of MIME encoded attachments of the type application/octet-stream. They require the boundary as provided in the headers and/or bodys of mails with enclosed attachments. (Yes, “bodys” — we keep it, it's part of the lore 💀)

If no file was provided, the scripts read from standard input, and they write out the detected MIME type to standard out. No cap.

🎀 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
           }
⚠️ heads up, bestie: there is no guarantee that this piece of a procmailrc(5) file will work.

🦋 SEE ALSO 🦋

Go give these a lil read:

Copyright, fr fr:

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

💜 AUTHORS 💜

Werner Fink <werner@suse.de>. — that's the author, bestie 🫶

brought to you by the 3rd Berkeley Distribution, dated Juni 28, 2007 — mimecheck(1), signing off 💅✨

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