source: source/ariba/communication/modules/transport/protlib/configuration.h@ 2803

/// ----------------------------------------*- mode: C++; -*--

/// @file configuration.h

/// Handling of simple (key, value) configuration files

/// ----------------------------------------------------------

/// $Id: configuration.h 2549 2007-04-02 22:17:37Z bless $

/// $HeadURL: https://svn.ipv6.tm.uka.de/nsis/protlib/trunk/include/configuration.h $

// ===========================================================

//                      

// Copyright (C) 2005-2007, all rights reserved by

// - Institute of Telematics, Universitaet Karlsruhe (TH)

//

// More information and contact:

// https://projekte.tm.uka.de/trac/NSIS

//                      

// 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; version 2 of the License

//

// 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.

//

// You should have received a copy of the GNU General Public License along

// with this program; if not, write to the Free Software Foundation, Inc.,

// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

//

// ===========================================================

#ifndef NATFW__CONFIG_H

#define NATFW__CONFIG_H



#include <fstream>

#include <map>

#include <list>

#include <exception>



#include "address.h"



namespace natfw {

  using protlib::hostaddress;





/**

 * An exception to be thrown if an invalid configuration is read.

 */

class config_error : public std::exception {

  public:

        config_error(const std::string &msg="Unspecified configuration error",

                        int line=-1) throw () : msg(msg), line(line) { }

        virtual ~config_error() throw () { }



        std::string get_msg() const throw () { return msg; }

        int get_line() const throw () { return line; }



  private:

        std::string msg;

        int line;

};



inline std::ostream &operator<<(std::ostream &os, const config_error &err) {

        if ( err.get_line() > 0 )

                return os << err.get_msg() << " at line " << err.get_line();

        else

                return os << err.get_msg();

}





/**

 * The specification of a configuration entry.

 *

 * This specifies the name of the key, the value type, and optionally an

 * initial default value.

 */

class config_entry {

  public:

        enum type_t {

                T_BOOL, T_INT, T_FLOAT, T_STR, T_IPv4, T_IPv6,

                T_IPv4_LIST, T_IPv6_LIST, T_END

        };



        config_entry(std::string key, type_t type, bool required=true)

                : key(key), type(type), required(required) { }



        config_entry(std::string key, bool value)

                : key(key), type(T_BOOL), bool_value(value) { }



        config_entry(std::string key, int value)

                : key(key), type(T_INT), int_value(value) { }



        config_entry(std::string key, float value)

                : key(key), type(T_FLOAT), float_value(value) { }



        config_entry(std::string key, std::string value)

                : key(key), type(T_STR), str_value(value) { }



        config_entry() : type(T_END) { }



  private:

        std::string key;

        type_t type;

        bool required;

        bool defined;



        bool bool_value;

        int int_value;

        float float_value;

        std::string str_value;

        hostaddress ipv4_value;

        hostaddress ipv6_value;

        std::list<hostaddress> address_list; // for both IPv4 and IPv6



        friend class configuration;

};





/**

 * A class for handling simple configuration files.

 *

 * The configuration consists of (key, value) pairs, where both key and value

 * are strings.

 *

 * A configuration file is line-oriented and has the following format:

 *   [space] key [space] = [space] value [space] EOL

 *

 * Value can be a boolean value, an integer, a float, an IP address (either

 * IPv4 or IPv6), or a string. String values have to be quoted using double

 * quotes. If a double quote should appear in the string, you have to quote it

 * using a backslash. A backslash in turn has to be quoted using another

 * backslash.

 *

 * Lines starting with '#' and empty lines are ignored.

 */

class configuration {

  public:

        configuration(config_entry defaults[]);



        void load(const std::string &filename) throw (config_error);

        void load(std::istream &in) throw (config_error);

        void dump(std::ostream &out) throw (config_error);



        bool is_defined(const std::string &key) const throw ();



        std::string get_string(const std::string &key) const throw ();

        bool get_bool(const std::string &key) const throw ();

        int get_int(const std::string &key) const throw ();

        float get_float(const std::string &key) const throw ();

        hostaddress get_ipv4_address(const std::string &key) const throw ();

        hostaddress get_ipv6_address(const std::string &key) const throw ();



        std::list<hostaddress> get_ipv4_address_list(

                const std::string &key) const throw ();

        std::list<hostaddress> get_ipv6_address_list(

                const std::string &key) const throw ();



  private:

        typedef std::map<std::string, config_entry>::const_iterator c_iter;

        std::map<std::string, config_entry> values;



        void strip_leading_space(std::istream &in) const;

        void skip_rest_of_line(std::istream &in) const;

        void parse_and_assign(const std::string &key, std::istream &in);



        bool parse_bool(std::istream &in) const;

        int parse_int(std::istream &in) const;

        float parse_float(std::istream &in) const;

        std::string parse_string(std::istream &in) const;

        hostaddress parse_ipv4_address(std::istream &in) const;

        hostaddress parse_ipv6_address(std::istream &in) const;

        std::list<hostaddress> parse_ipv4_address_list(std::istream &in) const;

        std::list<hostaddress> parse_ipv6_address_list(std::istream &in) const;

        void write_string(std::ostream &out, const std::string &str) const;

        void dump_address_list(std::ostream &out,

                const std::list<hostaddress> &addresses) const;

};





} // namespace natfw



#endif // NATFW__CONFIG_H