128 lines
3.5 KiB
Bash
Executable File
128 lines
3.5 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (C) 2001-2019 Graeme Walker <graeme_walker@users.sourceforge.net>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# ===
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#
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# emailrelay-notify.sh
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#
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# Looks for failed mail in the E-MailRelay spool directory and sends failure
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# notification messages using 'procmail'.
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#
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# usage: emailrelay-notify.sh [<spool-dir>]
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#
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# Notification of failed e-mail by means of e-mail messages is a requirement
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# imposed by the SMTP specification. However, a simpler approach might be more
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# appropriate -- for example, a line like this in a ".profile" script:
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#
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# if test -f /var/spool/emailrelay/*.envelope.bad ; then echo Failed mail >&2 ; fi
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#
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# or perhaps a cron entry like this, since output from a cron job gets sent
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# as mail:
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#
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# 0 0 * * * /bin/cat /var/spool/emailrelay/*.envelope.bad 2>/dev/null
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#
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tmp="/tmp/`basename $0`.$$.tmp"
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trap "rm -f \"${tmp}\" 2>/dev/null ; exit 0" 0 1 2 3 13 15
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procmail="procmail"
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# parse the command line
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#
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store="__SPOOL_DIR__"
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if test $# -ge 1
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then
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store="${1}"
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fi
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# check the spool directory
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#
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if test \! -d "${store}"
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then
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echo `basename $0`: invalid spool directory >&2
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exit 1
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fi
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# for each failed e-mail...
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#
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for file in "${store}"/emailrelay.*.envelope.bad ""
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do
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if test -f "${file}"
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then
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# parse out the failure reason and the original sender
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#
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content="`echo \"${file}\" | sed 's/envelope/content/' | sed 's/.bad//'`"
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reason="`fgrep MailRelay-Reason \"${file}\" | sed 's/X-[^ ]*Reason: //' | tr -d '\015'`"
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from="`fgrep MailRelay-From \"${file}\" | sed 's/X-MailRelay-From: //' | tr -d '\015'`"
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deliver_to="${from}"
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if test "${deliver_to}" = ""
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then
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deliver_to="root"
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fi
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# create a notification message header
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#
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boundary="--------------`basename \"${file}\"`.$$"
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echo "To: ${deliver_to}" > "${tmp}"
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echo "From: postmaster" >> "${tmp}"
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echo "Subject: Your e-mail could not be delivered" >> "${tmp}"
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echo "MIME-Version: 0.1" >> "${tmp}"
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echo "Content-Type: multipart/mixed; boundary=\"${boundary}\"" >> "${tmp}"
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echo "" >> "${tmp}"
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# add the message text
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#
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echo "" >> "${tmp}"
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echo "--${boundary}" >> "${tmp}"
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echo "Content-Type: text/plain; charset=us-ascii" >> "${tmp}"
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echo "" >> "${tmp}"
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if test -f "${content}"
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then
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egrep -i '^To:|^Subject:' ${content} >> "${tmp}"
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fi
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if test "${reason}" != ""
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then
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echo "Reason: ${reason}" >> "${tmp}"
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fi
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# add the message attachment
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#
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if test -f "${content}"
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then
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echo "--${boundary}" >> "${tmp}"
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echo "Content-Type: message/rfc822" >> "${tmp}"
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echo "Content-Transfer-Encoding: 8bit" >> "${tmp}"
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echo "Content-Description: `basename \"${content}\"`" >> "${tmp}"
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echo "" >> "${tmp}"
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cat "${content}" >> "${tmp}"
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fi
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echo "--${boundary}--" >> "${tmp}"
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# deliver the notification using procmail
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#
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echo `basename $0`: delivering `basename "${content}"` to ${deliver_to}
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"${procmail}" -d "${deliver_to}" < "${tmp}"
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rc=$?
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# clean up
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#
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if test "${rc}" -eq 0
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then
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rm -f "${file}" "${content}" 2>/dev/null
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fi
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fi
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done
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