#!/bin/bash
# arch-tag: 3d2f498c-aba5-4400-a867-0fc7bcc8623e
# interface:
# CLI: ssh-sendmail <remoteHost> <options>
# Ubuntu uses "ssh-sendmail -d -s <remoteHost> <options>" instead
# stdin:
# <envelope sender address>
# <rcpt address 1>
# <rcpt address 2>
# <rcpt address ...>
# <empty line>
# <mail incl. headers>
#
# stdout:
# ssh-sendmail: (Failed: <error message>|Succeeded: <remote accept message>)
#
# exit code:
# 0 successful
# error code otherwise (see nullmailer source for details)

myName="`basename \"${0}\"`"

# skip nullmailer options
while [ $# -gt 0 -a "${1}" != "--" ] ; do
  shift
done
if [ $# -gt 0 ] ; then
  shift
fi

remoteHost="${1}"

printSyntax() {
  cat << EOT
Syntax: ${myName} <ssh-options> <remoteHost> 
Sample: ${myName} mail.sascha.silbe.org -l alias -i /etc/nullmailer/id_dsa
EOT
  exit 1
}

getEnvelope() {
  read envSender
  envRcpts=""
  
  read curLine
  while [ -n "${curLine}" ] ; do
    # FIXME: curLine might contain malicious chars
    envRcpts="${envRcpts} ${curLine}"
    read curLine
  done
}

sendMail() {
  # reads mail from stdin
  if sshOutput="`ssh \"${@}\" /usr/lib/sendmail -f \"${envSender}\" ${envRcpts} 2>&1`" ; then
    echo "${myName}: Succeeded: ${sshOutput}"
    exit 0
  else
    echo "${myName}: Failed: ${sshOutput}"
    # temporary error
    exit 17
  fi
}

if [ -z "${1}" ] ; then
  printSyntax
fi
getEnvelope
sendMail "$@"