92 lines
3.0 KiB
Bash
Executable File
92 lines
3.0 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-multicast.sh
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#
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# An example E-MailRelay "--filter" script that copies/links each new message
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# into all available sub-directories of the main spool directory. The original
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# message files are deleted if they were successfully copied/linked into all
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# sub-directories.
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#
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# This can be used for SMTP multicast by having an emailrelay forwarding
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# process polling each sub-directory. (For POP multicasting use the
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# "emailrelay-filter-copy" program with the "pop-by-name" feature so that
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# there is no need to copy or link content files.)
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#
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# Hard links are used for the content files in order to conserve disk space.
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# Log entries are written into the base envelope file to help with error
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# recovery.
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#
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# By default errors in running this script are fed back to the remote SMTP
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# client. Alternatively, edit the code below to ignore these errors and leave
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# the submitted e-mail message in the main spool directory.
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#
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# parse the command-line
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#
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content="$1"
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envelope="$2"
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base_dir="`dirname \"${content}\"`"
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if test "$1" = "" -o "${base_dir}" = "."
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then
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echo usage: `basename $0` '<content-file> <envelope-file>' >&2
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exit 2
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fi
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# copy/link message files
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#
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list="`find \"${base_dir}\" -mount -maxdepth 1 -mindepth 1 -type d`"
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error_list=""
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subdir_exists="0"
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for dir in ${list} ""
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do
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if test -d "${dir}" -a "${dir}" != ".." -a "${dir}" != "." -a "${dir}" != "${base_dir}"
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then
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subdir_exists="1"
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envelope_tmp="${envelope}.`basename \"${dir}\"`.tmp"
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envelope_dst="${dir}/`basename \"${envelope}\" .new`"
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if ln "${content}" "${dir}" && cp "${envelope}" "${envelope_tmp}" && mv "${envelope_tmp}" "${envelope_dst}"
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then
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echo "X-MailRelay-Multicast: ${dir}>" | tr '>' '\r' >> "${envelope}"
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else
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error_list="${error_list} ${dir}"
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echo "X-MailRelay-Multicast-Error: ${dir}>" | tr '>' '\r' >> "${envelope}"
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fi
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fi
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done
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# error handling
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#
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if test "${subdir_exists}" = "0"
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then
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# no sub-directories created -- this script has no effect
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exit 0
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elif test "${error_list}" = ""
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then
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# successfully copied -- delete the original
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rm -f "${content}" "${envelope}"
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exit 100
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else
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# something failed -- tell the submitting smtp client, or
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# replace these three lines with "exit 0" if the client should not know...
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echo "<<multicast failed>>"
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echo "<<`basename $0`: `basename "${content}"`: failed to copy message into${error_list}>>"
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exit 1
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fi
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