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#! /bin/sh
# $Id: mail.sh,v 1.10 2004/06/06 17:33:22 gerhard Exp $
# Copyright Gerhard Rieger 2001-2003
# Published under the GNU General Public License V.2, see file COPYING
#set -vx
# This is an example for a shell script that can be fed to socat with exec.
# Its clue is that it does not use stdin/stdout for communication with socat,
# so you may feed the mail message via stdin to the script. The message should
# contain appropriate mail headers.
# Lines with only a dot are not permitted - use two dots as escape.
# This script supports multiline answers from server, but not much more yet.
# Usage: cat message.txt |socat exec:"mail.sh target@domain.com",fdin=3,fdout=4 tcp:mail.relay.org:25,crlf
while [ "$1" ]; do
case "$1" in
-f) shift; mailfrom="$1"; shift;;
*) break;;
esac
done
rcptto="$1"
[ -z "$1" ] && rcptto="root@loopback"
#server=$(expr "$rcptto" : '[^@]*@\(.*\)')
[ -z "$mailfrom" ] && mailfrom="$USER@$(hostname)"
# this function waits for a complete server message, checks if its status
# is in the permitted range (terminates session if not), and returns.
mail_chat () {
local cmd="$1"
local errlevel="$2"; [ -z "$errlevel" ] && errlevel=300
echo "> $cmd" >&2
if [ -n "$cmd" ]; then echo "$cmd" >&4; fi
while read status message <&3;
(
case "$status" in
[0-9][0-9][0-9]-*) exit 0;;
[0-9][0-9][0-9]*) exit 1;;
*) exit 0;;
esac
)
do :; done
echo "< $status $message" >&2
if [ "$status" -ge "$errlevel" ]; then
echo $message >&2
echo "QUIT" >&4; exit 1
fi
}
# expect server greeting
mail_chat
mail_chat "HELO $(hostname)"
mail_chat "MAIL FROM: $mailfrom"
mail_chat "RCPT TO: $rcptto"
mail_chat "DATA" 400
while read l; do echo "$l" >&4; done
mail_chat "."
mail_chat "QUIT"
exit 0
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