#!/bin/sh
#
#     tiger - A UN*X security checking system
#     Copyright (C) 1993 Douglas Lee Schales, David K. Hess, David R. Safford
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2, or (at your option)
#    any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#     Please see the file `COPYING' for the complete copyright notice.
#
#  check_aliases - 06/14/93
#
#-----------------------------------------------------------------------------
#
TigerInstallDir="/usr/share/tiger"

#
# Set default base directory.
# Order or preference:
#      -B option
#      TIGERHOMEDIR environment variable
#      TigerInstallDir installed location
#
basedir=${TIGERHOMEDIR:=$TigerInstallDir}

for parm
do
   case $parm in
   -B) basedir=$2; break;;
   esac
done

#
# Verify that a config file exists there, and if it does
# source it.
#
[ ! -r $basedir/config ] && {
  echo "--ERROR-- [init002e] No 'config' file in \`$basedir'."
  exit 1
}

. $basedir/config

. $BASEDIR/initdefs

#
# If run in test mode (-t) this will verify that all required
# elements are set.
#
[ "$Tiger_TESTMODE" = 'Y' ] && {
  haveallcmds GEN_ALIAS_SETS CAT AWK SED OUTPUTMETHOD RM || exit 1
  haveallfiles BASEDIR WORKDIR || exit 1
  
  echo "--CONFIG-- [init003c] $0: Configuration ok..."
  exit 0
}

trap cleanup 0
#------------------------------------------------------------------------
echo
echo "# Performing checks of mail aliases..."

haveallcmds GEN_ALIAS_SETS CAT AWK SED OUTPUTMETHOD LS RM || exit 1
haveallfiles BASEDIR WORKDIR || exit 1

progalias()
{
  rcpt="$1"
  file="$2"

  fmsg=
  [ -n "$file" ] && fmsg=" (from included file $file)"

  prog="`echo \"$rcpt\" | $SED -e 's/^[ 	|\"]*\([^\" ]*\).*$/\1/'`"

  if [ ! -f "$prog" ]; then
    message INFO ali001i "$rcpt" "Program alias \`$alias' executable does not exist$fmsg"
  else
    [ -n "$TigerCheckEmbedded" ] && {
      echo "$prog $source" >> $TigerCheckEmbedded
    }
    message WARN ali005w "$rcpt" "Alias \`$alias' contains a program entry${fmsg}:"
    case "$prog" in 
      *uudecode) message FAIL ali002f "" "Program alias \`$alias' executes $prog.";;
    esac
  fi

  lgetpermit "$prog" |
  pathmsg ali003 ali004 "$prog" root "Program alias \`$alias' uses$fmsg executable" "Alias: $rcpt"
}

filealias()
{
  alias="$1"
  file="`echo \"$2\" | $SED -e 's/[ 	]*:include://'`"

  [ ! -f "$file" ] && {
    message INFO ali006i "" "Alias \`$alias' included file \`$file' does not exist$fmsg"
  }
  
  lgetpermit "$file" |
  pathmsg ali007 ali008 "$file" root "Alias \`$alias' includes${fmsg} file"

  [ -r "$file" ] && {
    while read names
    do
      checkalias "$alias" "$names" "$file"
    done < "$file"
  }
}

checkalias()
{
  alias="$1"
  rcptlist="$2"
  file="$3"
  
  IFS=","
  set X $rcptlist
  IFS=$saveifs
  shift
  for rcpt
  do
    case $rcpt in
      *:include:*) # Include file
           filealias "$alias" "$rcpt" "$file"
           ;;
      ' '*\|*|\|*) # Program alias
           progalias "$rcpt" "$file"
           ;;
      ' '*'"|'*|'"|'*) # Program alias
           progalias "$rcpt" "$file"
           ;;  
    esac
  done
}

saveifs=$IFS

realpath="$REALPATH -d"

[ ! -n "$REALPATH" -o ! -f "$REALPATH" ] && realpath="echo"

$GEN_ALIAS_SETS |
while read alias_set
do
  source="`$CAT $alias_set.src`"
  echo "# Checking aliases from $source."

  $AWK '{
           if(substr($0, 1, 1) != " ")
	      printf("\n");
	   printf("%s", $0);
	}   
	END {printf("\n");}
  ' < $alias_set |
  $SED -e '/^$/d' |
  {
    IFS=:
    while read alias rcptlist
    do
      IFS=$saveifs
      checkalias "$alias" "$rcptlist" ""
      IFS=:
    done
  }
  
  delete $alias_set $alias_set.src
done |
$OUTPUTMETHOD
