#!/bin/sh

METASPLOIT_BASEDIR=/opt/metasploit-framework

DB_CONF=$METASPLOIT_BASEDIR/config/database.yml
DB_NAME=msf
DB_USER=msf
DB_PORT=5432
PG_SERVICE=postgresql

pw_gen() {
    openssl rand -base64 32
}

pg_cmd() {
    su - postgres -c "$*"
}

start_db() {
    if ! service $PG_SERVICE status >/dev/null; then
	service $PG_SERVICE start
    fi
}

stop_db() {
    if service $PG_SERVICE status >/dev/null; then
	service $PG_SERVICE stop
    fi
}

db_exists() {
    if pg_cmd "psql -lqt" | cut -d \| -f 1 | grep -qw $1; then
	return 0
    fi
    return 1
}

user_exists() {
    if echo "SELECT usename FROM pg_user;" | pg_cmd "psql -qt postgres" | grep -qw $1; then
	return 0
    fi
    return 1
}

init_db() {
    start_db
    if [ -e $DB_CONF ]; then
	echo "A database appears to be already configured, skipping initialization"
	return
    fi
    DB_PASS=$(pw_gen)
    if user_exists $DB_USER; then
	echo "Resetting password of database user '$DB_USER'"
	printf "ALTER ROLE $DB_USER WITH PASSWORD '$DB_PASS';\n" | pg_cmd psql postgres >/dev/null
    else
	echo "Creating database user '$DB_USER'"
	printf "%s\n%s\n" "$DB_PASS" "$DB_PASS" | pg_cmd createuser -S -D -R -P $DB_USER >/dev/null
    fi
    echo "Creating databases '$DB_NAME' and '${DB_NAME}_test'"
    if ! db_exists $DB_NAME; then
	pg_cmd createdb $DB_NAME -O $DB_USER -T template0 -E UTF-8
    fi
    if ! db_exists ${DB_NAME}_test; then
	pg_cmd createdb ${DB_NAME}_test -O $DB_USER -T template0 -E UTF-8
    fi
    echo "Creating configuration file in $DB_CONF"
    cat > $DB_CONF <<-EOF
development:
  adapter: postgresql
  database: $DB_NAME
  username: $DB_USER
  password: $DB_PASS
  host: localhost
  port: $DB_PORT
  pool: 5
  timeout: 5

production:
  adapter: postgresql
  database: $DB_NAME
  username: $DB_USER
  password: $DB_PASS
  host: localhost
  port: $DB_PORT
  pool: 5
  timeout: 5

test:
  adapter: postgresql
  database: ${DB_NAME}_test
  username: $DB_USER
  password: $DB_PASS
  host: localhost
  port: $DB_PORT
  pool: 5
  timeout: 5
EOF
    echo "Creating initial database schema"
    cd $METASPLOIT_BASEDIR
    bundle exec rake db:migrate >/dev/null
}

delete_db() {
    start_db
    if db_exists $DB_NAME; then
	pg_cmd dropdb $DB_NAME
    fi
    if db_exists ${DB_NAME}_test; then
	pg_cmd dropdb ${DB_NAME}_test
    fi
    if user_exists $DB_USER; then
	pg_cmd dropuser $DB_USER
    fi
    rm -f $DB_CONF
}

reinit_db() {
    delete_db
    init_db
}

usage() {
  PROG=`basename $0`
  echo
  echo "Manage a metasploit framework database"
  echo
  echo "  $PROG init    # initialize the database"
  echo "  $PROG reinit  # delete and reinitialize the database"
  echo "  $PROG delete  # delete database and stop using it"
  echo "  $PROG start   # start the database"
  echo "  $PROG stop    # stop the database"
  echo
  exit
}

if [ "$#" -ne 1 ]; then
  usage
fi

if [ $(id -u) -ne 0 ]; then
    echo "ERROR: $0: must be run as root"
    exit 1
fi

case $1 in
  init) init_db ;;
  reinit) reinit_db ;;
  delete) delete_db ;;
  start) start_db ;;
  stop) stop_db ;;
  *) echo "Error: unrecognized action '${1}'"; usage ;;
esac