#! /bin/sh
# postinst script for clamav-freshclam
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
#
# quoting from the policy:
#     Any necessary prompting should almost always be confined to the
#     post-installation script, and should be protected with a conditional
#     so that unnecessary prompting doesn't happen if a package's
#     installation fails and the `postinst' is called with `abort-upgrade',
#     `abort-remove' or `abort-deconfigure'.

#loading debconf module
. /usr/share/debconf/confmodule

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
}


FRESHCLAMCONFFILE=/etc/clamav/freshclam.conf
FRESHCLAMLOGFILE=/var/log/clamav/freshclam.log
DEBCONFFILE=/var/lib/clamav/freshclam.conf
LOGROTFILE=/etc/logrotate.d/clamav-freshclam
DEBROTFILE=/var/lib/clamav/clamav-freshclam
DO_RUN_AS_EVALUATION=0

case "$1" in
  configure)

  # Configure the hardcoded stuff
  dbowner=clamav
  udlogfile="$FRESHCLAMLOGFILE"
  maxatt=5

  # Read the configuration file
  slurp_config "$FRESHCLAMCONFFILE"

  # Get the debconf answers
  db_get clamav-freshclam/local_mirror || true
  [ "$RET" = "" ] || rawmirrors="$RET"
  if echo "$rawmirrors" | egrep -q '(\(|\))'; then
    mirrors=`echo "$rawmirrors" | awk '{print $1}'`
  else
    mirrors="$rawmirrors"
  fi
  db_get clamav-freshclam/autoupdate_freshclam || true
  runas="$RET"
  if [ "$runas" = "ifup.d" ]; then
    db_get clamav-freshclam/internet_interface || true
    if [ "$RET" != "" ]; then
      iface="$RET"
    else
      # Like the template promised
      runas="daemon"
    fi
  fi
  if [ "$runas" = "ifup.d" ] || [ "$runas" = "daemon" ] || [ "$runas" = "cron" ]; then
    db_get clamav-freshclam/update_interval || true
    if [ "$RET" != "" ]; then
      if [ "$runas" != "cron" ]; then
        checks="$RET"
      else
        if [ "$RET" -ge 24 ]; then
          echo "To check for updates more often than hourly, please run freshclam as a daemon."
          cronhour=1
        else
          cronhour="`expr 24 / $RET`"
        fi
      fi
    fi
  fi
  db_get clamav-freshclam/http_proxy || true
  if [ "$RET" != "" ]; then
    url="`echo "$RET" | sed -e 's,^http://,,g' | sed -e 's,/$,,g'`"
    phost="`echo "$url" | cut -d':' -f 1`"
    pport="`echo "$url" | cut -d':' -f 2`"
    if [ "$pport" = "$phost" ]; then
        pport=""
    fi
    fullurl="$RET"
    db_metaget clamav-freshclam/proxy_user value || true
    if [ "$RET" != "" ]; then
      fulluser="$RET"
      puser="`echo "$RET" | cut -d':' -f 1`"
      ppass="`echo "$RET" | cut -d':' -f 2`"
    fi
  fi
  db_get clamav-freshclam/NotifyClamd || true
  [ "$RET" = "true" ] && notify="/etc/clamav/clamd.conf"
  db_get clamav-freshclam/Bytecode || true
  Bytecode="$RET"
  db_get clamav-freshclam/LogRotate || true
  LogRotate="$RET"
  db_get clamav-freshclam/PrivateMirror || true
  PrivateMirror="$RET"

  # Make sure user changes to unasked questions remain intact
  [ -n "$DatabaseOwner" ] && [ "$DatabaseOwner" != "$dbowner" ] && dbowner="$DatabaseOwner"
  [ -n "$UpdateLogFile" ] && [ "$UpdateLogFile" != "$udlogfile" ] && udlogfile="$UpdateLogFile"
  [ -n "$MaxAttempts" ] && [ "$MaxAttempts" != "$maxatt" ] && maxatt="$MaxAttempts"

  if [ -n "$udlogfile" ]; then
    if echo "$udlogfile" | grep -q '^/dev/'; then
      make_logrotate=false
    else
      if [ "$LogRotate" = "true" ]; then
        make_logrotate=true
      else
        make_logrotate=false
      fi
    fi
    [ -z "$User" ] && User=clamav
    if [ "$make_logrotate" = 'true' ]; then
      # update the logrotate file
      echo "$udlogfile {" > $DEBROTFILE
      echo "     rotate 12" >> $DEBROTFILE
      echo "     weekly" >> $DEBROTFILE
      echo "     compress" >> $DEBROTFILE
      echo "     delaycompress" >> $DEBROTFILE
      echo "     missingok" >> $DEBROTFILE
      echo "     create 640  $User adm" >> $DEBROTFILE
      echo "     postrotate" >> $DEBROTFILE
      echo "     if [ -d /run/systemd/system ]; then" >> $DEBROTFILE
      echo "         systemctl -q is-active clamav-freshclam && systemctl kill --signal=SIGHUP clamav-freshclam || true" >> $DEBROTFILE
      echo "     else" >> $DEBROTFILE
      echo "         invoke-rc.d clamav-freshclam reload-log > /dev/null || true" >> $DEBROTFILE
      echo "     fi" >> $DEBROTFILE
      echo "     endscript" >> $DEBROTFILE
      echo "     }" >> $DEBROTFILE
      touch "$udlogfile"
      if [ -f "$udlogfile" ] && [ ! -L "$udlogfile" ]; then
        chown "$User":adm "$udlogfile"
        chmod 0640 "$udlogfile"
      fi
      ucf_cleanup "$LOGROTFILE"
      ucf_upgrade_check "$LOGROTFILE" "$DEBROTFILE" /var/lib/ucf/cache/:etc:logrotate.d:clamav-freshclam
      rm -f $DEBROTFILE
    else
      if [ -e "$LOGROTFILE" ]; then
        echo "Disabling old logrotate script for clamav-freshclam"
        mv "$LOGROTFILE" "$CLAMAVROTATEFILE".dpkg-old
        ucf -p "$LOGROTFILE"
      fi
    fi
  else
    if [ -e "$LOGROTFILE" ]; then
      echo "Disabling old logrotate script for clamav-freshclam"
      mv "$LOGROTFILE" "$CLAMAVROTATEFILE".dpkg-old
      ucf -p "$LOGROTFILE"
    fi
  fi

  # Set up cron method
  if [ "$runas" = cron ]; then
    min=$(( `od -A n -N 2 -l  < /dev/urandom`  %  3600 / 60 ))
    # min=`perl -e 'print int(rand(60))'`
    FRESHCLAMCRON=/etc/cron.d/clamav-freshclam
    FRESHCLAMTEMP=/var/lib/clamav/freshclam.cron
    echo "$min */$cronhour * * *    $dbowner [ -x /usr/bin/freshclam ] && /usr/bin/freshclam --quiet >/dev/null" > "$FRESHCLAMTEMP"
    ucf_cleanup "$FRESHCLAMCRON"
    ucf_upgrade_check "$FRESHCLAMCRON" "$FRESHCLAMTEMP" /var/lib/ucf/cache/:etc:cron.d:clamav-freshclam
    rm -f "${FRESHCLAMCRON}.ucf-dist"
    rm -f "$FRESHCLAMTEMP"
  else
    if [ -e /etc/cron.d/clamav-freshclam ]; then
      echo -n "Disabling old cron script . . . "
      mv /etc/cron.d/clamav-freshclam /etc/cron.d/clamav-freshclam.dpkg-old
      ucf -p /etc/cron.d/clamav-freshclam > /dev/null 2>&1 || true
      echo "done"
    fi
  fi
  
  # Set up ifup.d method
  if [ "$runas" = 'ifup.d' ]; then
    [ -n "$iface" ] && echo "$iface" > /var/lib/clamav/interface
  else
    [ -f /var/lib/clamav/interface ] && rm -f /var/lib/clamav/interface

  fi
  # Set default values for options not configured via debconf
  [ -z "$DatabaseDirectory" ] && DatabaseDirectory='/var/lib/clamav'
  [ -z "$LogFileMaxSize" ] && LogFileMaxSize=0
  [ -z "$LogTime" ] && LogTime=true
  [ -z "$LogVerbose" ] && LogVerbose=false
  [ -z "$LogSyslog" ] && LogSyslog=false
  [ -z "$LogFacility" ] && LogFacility=LOG_LOCAL6
  [ -z "$DNSDatabaseInfo" ] && DNSDatabaseInfo='current.cvd.clamav.net'
  [ -z "$ScriptedUpdates" ] && ScriptedUpdates=yes
  [ -z "$CompressLocalDatabase" ] && CompressLocalDatabase=no
  [ -z "$Foreground" ] && Foreground=false
  [ -z "$Debug" ] && Debug=false
  [ -z "$ConnectTimeout" ] && ConnectTimeout=30
  [ -z "$ReceiveTimeout" ] && ReceiveTimeout=0
  [ -z "$TestDatabases" ] && TestDatabases=yes

  # Generate config file
  cat >> $DEBCONFFILE << EOF
# Automatically created by the clamav-freshclam postinst
# Comments will get lost when you reconfigure the clamav-freshclam package

DatabaseOwner $dbowner
UpdateLogFile $udlogfile
LogVerbose $LogVerbose
LogSyslog $LogSyslog
LogFacility $LogFacility
LogFileMaxSize $LogFileMaxSize
LogRotate $LogRotate
LogTime $LogTime
Foreground $Foreground
Debug $Debug
MaxAttempts $maxatt
DatabaseDirectory $DatabaseDirectory
DNSDatabaseInfo $DNSDatabaseInfo
ConnectTimeout $ConnectTimeout
ReceiveTimeout $ReceiveTimeout
TestDatabases $TestDatabases
ScriptedUpdates $ScriptedUpdates
CompressLocalDatabase $CompressLocalDatabase
Bytecode $Bytecode
EOF

  if [ -n "$notify" ] ;then
    echo "NotifyClamd $notify" >> $DEBCONFFILE
  fi

  if [ "$runas" != "cron" ] || [ "$runas" != "manual" ]; then
    if [ -n "$checks" ] && [ "$checks" != "true" ]; then
      echo "# Check for new database $checks times a day" >> $DEBCONFFILE
      echo "Checks $checks" >> $DEBCONFFILE
    fi
  fi
  if [ -n "$mirrors" ]; then
    for i in $mirrors; do
      echo "DatabaseMirror $i" >> $DEBCONFFILE
    done
  fi
  # the first mirror is managed via debconf (and might have been changed)
  DatabaseMirror="`echo $DatabaseMirror | sed 's/^[[:space:]]*[^[:space:]]\+[[:space:]]\*//'`"
  DatabaseMirror="$DatabaseMirror database.clamav.net"
  for m in $DatabaseMirror; do
    grep -q "$m" "$DEBCONFFILE" || echo "DatabaseMirror $m" >> $DEBCONFFILE
  done

  if [ -n "$phost" ]; then
    echo "# Proxy: $fullurl" >> $DEBCONFFILE
    echo "HTTPProxyServer $phost" >> $DEBCONFFILE
    if [ -n "$pport" ]; then
      echo "HTTPProxyPort $pport" >> $DEBCONFFILE
    fi
  fi
  if [ -n "$puser" ] && [ -n "$ppass" ]; then
    echo "# Proxy authentication: $fulluser" >> $DEBCONFFILE
    echo "HTTPProxyUsername $puser" >> $DEBCONFFILE
    echo "HTTPProxyPassword $ppass" >> $DEBCONFFILE
  fi

  [ -n "$PidFile" ] && echo "PidFile $PidFile" >> $DEBCONFFILE
  [ -n "$HTTPUserAgent" ] && echo "HTTPUserAgent $HTTPUserAgent" >> $DEBCONFFILE
  [ -n "$OnOutdatedExecute" ] && echo "OnOutdatedExecute $OnOutdatedExecute" >> $DEBCONFFILE
  [ -n "$OnUpdateExecute" ] && echo "OnUpdateExecute $OnUpdateExecute" >> $DEBCONFFILE
  [ -n "$OnErrorExecute" ] && echo "OnErrorExecute $OnErrorExecute" >> $DEBCONFFILE
  [ -n "$LocalIPAddress" ] && echo "LocalIPAddress $LocalIPAddress" >> $DEBCONFFILE
  [ -n "$PrivateMirror" ] && echo "PrivateMirror $PrivateMirror" >> $DEBCONFFILE
  [ -n "$ExcludeDatabase" ] && echo "ExcludeDatabase $ExcludeDatabase" >> $DEBCONFFILE
  if [ -n "$DatabaseCustomURL" ]; then
    for i in $DatabaseCustomURL; do
      echo "DatabaseCustomURL $i" >> $DEBCONFFILE
    done
  fi
  if [ -n "$ExtraDatabase" ]; then
    for i in $ExtraDatabase; do
      echo "ExtraDatabase $i" >> $DEBCONFFILE
    done
  fi
  
  ucf_cleanup "$FRESHCLAMCONFFILE"
  ucf_upgrade_check "$FRESHCLAMCONFFILE" "$DEBCONFFILE" /var/lib/ucf/cache/:etc:clamav:freshclam.conf
  rm -f "$DEBCONFFILE"

  db_stop || true
  
  # Permissions are still fsck'd - repair manually
  for script in /etc/network/if-up.d/clamav-freshclam-ifupdown \
    /etc/network/if-down.d/clamav-freshclam-ifupdown \
    /etc/ppp/ip-down.d/clamav-freshclam-ifupdown \
    /etc/ppp/ip-up.d/clamav-freshclam-ifupdown; do
    if [ -e "$script" ]; then
      [ -x "$script" ] || chmod +x "$script"
    fi
  done
  touch $FRESHCLAMLOGFILE
  if [ -f "$FRESHCLAMLOGFILE" ] && [ ! -L "$FRESHCLAMLOGFILE" ]; then
    chmod 640 $FRESHCLAMLOGFILE
    chown "$dbowner":adm $FRESHCLAMLOGFILE
  fi
  
  if [ -f "$FRESHCLAMCONFFILE" ] && [ ! -L "$FRESHCLAMCONFFILE" ]; then
    # Tighten the permissions up if it contains a password
    if [ -n "$ppass" ]; then
      chmod 400 $FRESHCLAMCONFFILE
    else
      chmod 444 $FRESHCLAMCONFFILE
    fi

    chown "$dbowner":adm $FRESHCLAMCONFFILE
  fi
  
  DO_RUN_AS_EVALUATION=1
  ;;
  abort-upgrade|abort-remove|abort-deconfigure)
  ;;
  *)
  echo "postinst called with unknown argument \`$1'" >&2
  exit 1
  ;;
esac

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

# Automatically added by dh_apparmor/3.0.8-3
if [ "$1" = "configure" ]; then
    APP_PROFILE="/etc/apparmor.d/usr.bin.freshclam"
    if [ -f "$APP_PROFILE" ]; then
        # Add the local/ include
        LOCAL_APP_PROFILE="/etc/apparmor.d/local/usr.bin.freshclam"

        test -e "$LOCAL_APP_PROFILE" || {
            mkdir -p `dirname "$LOCAL_APP_PROFILE"`
            install --mode 644 /dev/null "$LOCAL_APP_PROFILE"
        }

        # Reload the profile, including any abstraction updates
        if aa-enabled --quiet 2>/dev/null; then
            apparmor_parser -r -T -W "$APP_PROFILE" || true
        fi
    fi
fi
# End automatically added section


if [ $DO_RUN_AS_EVALUATION -eq 1 ]
then
  if [ "$runas" = 'daemon' ]; then
    update-rc.d clamav-freshclam defaults >/dev/null
    invoke-rc.d clamav-freshclam start
  elif [ "$runas" = 'ifup.d' ]; then
    for intrface in $iface; do
      if route | grep -q "$intrface"; then
        IFACE="$intrface" invoke-rc.d clamav-freshclam start || true
	break
      fi
    done
    update-rc.d -f clamav-freshclam disable > /dev/null 2>&1 || true
  else
    echo "Starting database update: "
    invoke-rc.d clamav-freshclam no-daemon || true
    update-rc.d -f clamav-freshclam disable > /dev/null 2>&1 || true
  fi
fi

exit 0