root-tools/sendmail.smtp

   1 #!/bin/bash
   2
   3 # This is a script to mimic sendmail(1) interface, but
   4 # forward mail to local MTA via sendEmail(1).
   5
   6 . /usr/lib/tool/bash-utils || exit -1
   7
   8 declare -a recipient
   9 from_header=''
  10 envelope_sender=''
  11 get_recipients_from_headers=no
  12 single_dot_terminates_input=yes
  13
  14 while [ -n "$1" ]
  15 do
  16         case "$1" in
  17         -F)     shift
  18                 from_header=$1;;
  19         -f|-r)
  20                 shift
  21                 envelope_sender=$1;;
  22         -t)     get_recipients_from_headers=yes;;
  23         -ti)
  24                 get_recipients_from_headers=yes
  25                 single_dot_terminates_input=no
  26                 ;;
  27         -i|-oi)
  28                 single_dot_terminates_input=no;;
  29         -o)
  30                 shift
  31                 warnx "Ignoring option: -o $1";;
  32         -bp|-bs)
  33                 errx 22 "Option not supported: $1";;
  34         -*)     errx 22 "Unknown option: $1";;
  35         *)      recipient+=("$1");;
  36         esac
  37         shift
  38 done
  39
  40 if [ $get_recipients_from_headers = yes -a ${#recipient[@]} != 0 ]
  41 then
  42         errx 22 "Option -t and specifying recipients are mutually exclusive."
  43 fi
  44
  45
  46 maildomain=`cat /etc/domain || cat /etc/mailname`
  47
  48 qualify_address()
  49 {
  50         # add local domain name if there is no domain part in the address
  51         local addr=$1
  52         if ! [[ $addr =~ @ ]]
  53         then
  54                 addr=$addr@$maildomain
  55         fi
  56         echo "$addr"
  57 }
  58
  59 if [ -z "$envelope_sender" ]
  60 then
  61         envelope_sender=$USER@$maildomain
  62 else
  63         envelope_sender=`qualify_address "$envelope_sender"`
  64 fi
  65
  66 for idx in ${!recipient[@]}
  67 do
  68         recipient[$idx]=`qualify_address "${recipient[$idx]}"`
  69 done
  70
  71
  72 auto_qualify_recipients()
  73 {
  74         local line hname hcontent
  75
  76         while IFS=$'\n' read -r line
  77         do
  78                 if [[ $line =~ ^(To|Cc|Bcc):([^$'\r']+) ]]
  79                 then
  80                         hname=${BASH_REMATCH[1]}
  81                         hcontent=${BASH_REMATCH[2]}
  82                         hcontent=`qualify_address "$hcontent"`
  83                         line="$hname:$hcontent"$'\r'
  84                 fi
  85                 printf '%s\n' "$line"
  86         done
  87 }
  88
  89 call_sendEmail()
  90 {
  91         sendEmail -f "$envelope_sender" -t "${recipient[@]}" \
  92                 -o message-format=raw -o message-file=- \
  93                 -s "${SMTP_SERVER:-localhost:25}" \
  94                 1>&2
  95 }
  96
  97 if [ $get_recipients_from_headers = yes ]
  98 then
  99         raw_email=`cat`
 100         _IFS=$IFS
 101         IFS=$'\n'
 102         recipient+=(`echo "$raw_email" | auto_qualify_recipients | mail-extract-raw-headers To Cc Bcc | mail-extract-addresses`)
 103         IFS=$_IFS
 104         if [ -n "$SENDMAIL_DEBUG" ]
 105         then
 106                 warnx "detected recipients: ${recipient[@]}"
 107         fi
 108         echo "$raw_email" | call_sendEmail
 109 else
 110         call_sendEmail
 111 fi