Merge branch 'master' of https://github.com/i-maravic/pdns into i-maravic-master

[thirdparty/pdns.git] / pdns / arguments.hh

/*
    PowerDNS Versatile Database Driven Nameserver
    Copyright (C) 2002  PowerDNS.COM BV

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2
    as published by the Free Software Foundation

    Additionally, the license of this program contains a special
    exception which allows to distribute the program in binary form when
    it is linked against OpenSSL.

    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 St, Fifth Floor, Boston, MA  02110-1301  USA
*/
#ifndef ARGUMENTS_HH
#define ARGUMENTS_HH

#include <map>
#include <set>
#include <string>
#include <vector>
#include <fstream>
#include <iostream>
#include "misc.hh"
#include "pdnsexception.hh"
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>

#include "namespaces.hh"

typedef PDNSException ArgException;

/** This class helps parsing argc and argv into a map of parameters. We have 3 kinds of formats:


    -w           this leads to a key/value pair of "w"/void

    --port=25    "port"/"25"

    --daemon     "daemon"/void

    We do not support "--port 25" syntax.

    It can also read from a file. This file can contain '#' to delimit comments.

    Some sample code:

    \code

    ArgvMap R;
  
    R.set("port")="25";  // use this to specify default parameters
    R.file("./default.conf"); // parse configuration file
    
    R.parse(argc, argv); // read the arguments from main()
    
    cout<<"Will we be a deamon?: "<<R.isset("daemon")<<endl;
    cout<<"Our port will be "<<R["port"]<<endl;
    
    map<string,string>::const_iterator i;
    cout<<"via iterator"<<endl;
    for(i=R.begin();i!=R.end();i++)
    cout<<i->first<<"="<<i->second<<endl;
    \endcode
*/



class ArgvMap
{
public:
  ArgvMap();
  void parse(int &argc, char **argv, bool lax=false); //!< use this to parse from argc and argv
  void laxParse(int &argc, char **argv) //!< use this to parse from argc and argv
  {
    parse(argc,argv,true);
  }
  void preParse(int &argc, char **argv, const string &arg); //!< use this to preparse a single var
  bool preParseFile(const char *fname, const string &arg, const string& theDefault=""); //!< use this to preparse a single var in configuration

  bool file(const char *fname, bool lax=false); //!< Parses a file with parameters
  bool file(const char *fname, bool lax, bool included); 
  bool laxFile(const char *fname) 
  {
    return file(fname,true);
  }
  typedef map<string,string> param_t; //!< use this if you need to know the content of the map
  bool parmIsset(const string &var); //!< Checks if a parameter is set to *a* value
  bool mustDo(const string &var); //!< if a switch is given, if we must do something (--help)
  int asNum(const string &var); //!< return a variable value as a number
  mode_t asMode(const string &var); //<!< return value interpreted as octal number
  uid_t asUid(const string &var); //!< return user id, resolves if necessary
  gid_t asGid(const string &var); //!< return group id, resolves if necessary
  double asDouble(const string &var); //!< return a variable value as a number
  string &set(const string &); //!< Gives a writable reference and allocates space for it
  string &set(const string &, const string &); //!< Does the same but also allows one to specify a help message
  void setCmd(const string &, const string &); //!< Add a command flag
  string &setSwitch(const string &, const string &); //!< Add a command flag
  string helpstring(string prefix=""); //!< generates the --help
  string configstring(bool current=false); //!< generates the --mkconfig
  bool contains(const string &var, const string &val);
  bool isEmpty(const string &var); //<! checks if variable has value

  vector<string>list();
  string getHelp(const string &item);

  const param_t::const_iterator begin(); //!< iterator semantics
  const param_t::const_iterator end(); //!< iterator semantics
  const string &operator[](const string &); //!< iterator semantics
  const vector<string>&getCommands();
private:
  void parseOne(const string &unparsed, const string &parseOnly="", bool lax=false);
  typedef map<string,string> params_t;
  params_t params;
  map<string,string> helpmap;
  map<string,string> d_typeMap;
  vector<string> d_cmds;
  std::set<string> d_cleared;
};

extern ArgvMap &arg();

#endif /* ARGUMENTS_HH */