File: common_functions

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clamav 0.101.4+dfsg-0+deb9u1
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to_lower()
{
  word="$1"
  lcword=$(echo "$word" | tr A-Z a-z)
  echo "$lcword"
}

is_true()
{
  var="$1"
  lcvar=$(to_lower "$var")
  [ 'true' = "$lcvar" ] || [ 'yes' = "$lcvar" ] || [ 1 = "$lcvar" ]
  return $?
}

is_false()
{
  var="$1"
  lcvar=$(to_lower "$var")
  [ 'false' = "$lcvar" ] || [ 'no' = "$lcvar" ] || [ 0 = "$lcvar" ]
  return $?
}

ucf_cleanup()
{
  # This only does something if I've fucked up before
  # Not entirely impossible :(

  configfile=$1

  if [ `grep "$configfile" /var/lib/ucf/hashfile | wc -l` -gt 1 ]; then
    grep -v "$configfile" /var/lib/ucf/hashfile > /var/lib/ucf/hashfile.tmp
    grep "$configfile" /var/lib/ucf/hashfile | tail -n 1  >> /var/lib/ucf/hashfile.tmp
    mv /var/lib/ucf/hashfile.tmp /var/lib/ucf/hashfile
  fi
}

add_to_ucf()
{
  configfile=$1
  ucffile=$2

  if ! grep -q "$configfile" /var/lib/ucf/hashfile; then
    md5sum $configfile >> /var/lib/ucf/hashfile
    cp $configfile $ucffile
  fi
}

ucf_upgrade_check()
{
  configfile=$1
  sourcefile=$2
  ucffile=$3

  if [ -f "$configfile" ]; then
    add_to_ucf $configfile $ucffile
    ucf --three-way --debconf-ok "$sourcefile" "$configfile"
  else
    [ -d /var/lib/ucf/cache ] || mkdir -p /var/lib/ucf/cache
    pathfind restorecon && restorecon /var/lib/ucf/cache
    cp $sourcefile $configfile
    add_to_ucf $configfile $ucffile
  fi
}

slurp_config()
{
  CLAMAVCONF="$1"
  
  if [ -e "$CLAMAVCONF" ]; then
    for variable in `egrep -a -v '^[[:space:]]*(#|$)' "$CLAMAVCONF" | awk '{print $1}'`; do
      case "$variable" in
        DatabaseMirror)
        if [ -z "$DatabaseMirror" ]; then
          for i in `grep -a ^$variable $CLAMAVCONF | awk '{print $2}'`; do
            value="$value $i"
          done
        else
          continue
        fi
        ;;
        DatabaseCustomURL)
        if [ -z "$DatabaseCustomURL" ]; then
          for i in `grep -a ^$variable $CLAMAVCONF | awk '{print $2}'`; do
            value="$value $i"
          done
        else
          continue
        fi
        ;;
        IncludePUA)
        if [ -z "$IncludePUA" ]; then
          for i in `grep -a ^$variable $CLAMAVCONF | awk '{print $2}'`; do
            value="$i $value"
          done
        else
          continue
        fi
        ;;
        ExcludePUA)
        if [ -z "$ExcludePUA" ]; then
          for i in `grep -a ^$variable $CLAMAVCONF | awk '{print $2}'`; do
            value="$i $value"
          done
        else
          continue
        fi
        ;;
        ExtraDatabase)
        if [ -z "$ExtraDatabase" ]; then
          for i in `grep -a ^$variable $CLAMAVCONF | awk '{print $2}'`; do
            value="$value $i"
          done
        else
          continue
        fi
        ;;
        VirusEvent|OnUpdateExecute|OnErrorExecute|RejectMsg)
        value=`grep -a ^$variable $CLAMAVCONF | head -n1 | sed -e s/$variable\ //`
        ;;
        *)
        value=`grep -a "^$variable[[:space:]]" $CLAMAVCONF | head -n1 | awk '{print $2}'`
        ;;
      esac
      if [ -z "$value" ]; then 
        export "$variable"="true"
      elif [ "$value" != "$variable" ]; then
        export "$variable"="$value"
      else
        export "$variable"="true"
      fi
      unset value
    done
  fi
}

pathfind() {
  OLDIFS="$IFS"
  IFS=:
  for p in $PATH; do
    if [ -x "$p/$*" ]; then
      IFS="$OLDIFS"
      return 0
    fi
  done
  IFS="$OLDIFS"
  return 1
}

set_debconf_value()
{
prog=$1
name=$2
eval variable="\$${name}"
if [ -n "$variable" ]; then
  db_set clamav-$prog/$name "$variable" || true
fi
}

make_dir()
{
  DIR=$1
  if [ -d "$DIR" ]; then
    return 0;
  fi
  [ -n "$User" ] || User=clamav
  mkdir -p -m 0755 "$DIR"
  chown "$User" "$DIR"
  pathfind restorecon && restorecon "$DIR"
}

# Debconf Functions

isdigit ()
{
  case $1 in
    [[:digit:]]*)
    ISDIGIT=1
    ;;
    *)
    ISDIGIT=0
    ;;
  esac
}

inputdigit ()
{
  ISDIGIT=0
  while [ "$ISDIGIT" = '0' ]; do
    db_input "$1" "$2" || true
    if ! db_go; then
      return 30
    fi
    db_get $2 || true
    isdigit $RET
    if [ "$ISDIGIT" = '0' ]; then
      db_input critical clamav-base/numinfo || true
      db_go
    fi
  done
  return 0
}

StateGeneric()
{
  PRIO=$1
  QUESTION=$2
  NEXT=$3
  LAST=$4

  db_input $PRIO $QUESTION || true
  if db_go; then
    STATE=$NEXT
  else
    STATE=$LAST
  fi
}

StateGenericDigit()
{
  PRIO=$1
  QUESTION=$2
  NEXT=$3
  LAST=$4

  inputdigit $PRIO $QUESTION || true
  if db_go; then
    STATE=$NEXT
  else
    STATE=$LAST
  fi
}