/**
 * config.c 
 * Routines for loading the configuration file.
 *
 * Matej Pfajfar <mp292@cam.ac.uk>
 */

/*
 * Changes :
 * $Log$
 * Revision 1.6  2002/07/10 12:37:49  montrose
 * Added usage display on error.
 *
 * Revision 1.5  2002/07/09 19:51:41  montrose
 * Miscellaneous bug fixes / activated "make check" for src/or
 *
 * Revision 1.4  2002/07/03 19:58:18  montrose
 * minor bug fix in error checking
 *
 * Revision 1.3  2002/07/03 16:53:34  montrose
 * added error checking into getoptions()
 *
 * Revision 1.2  2002/07/03 16:31:22  montrose
 * Added getoptions() and made minor adjustment to poptReadDefaultOptions()
 *
 * Revision 1.1.1.1  2002/06/26 22:45:50  arma
 * initial commit: current code
 *
 * Revision 1.3  2002/04/02 14:28:24  badbytes
 * Final finishes.
 *
 * Revision 1.2  2002/01/27 00:42:50  mp292
 * Reviewed according to Secure-Programs-HOWTO.
 *
 * Revision 1.1  2002/01/03 10:24:05  badbytes
 * COde based on that in op. Needs to be modified.
 *
 */

#include "or.h"
#include <libgen.h>

/* loads the configuration file */
int getconfig(char *conf_filename, config_opt_t *options)
{
  FILE *cf = NULL;
  int retval = 0;
  
  if ((!conf_filename) || (!options))
    return -1;
  
  /* load config file */
  cf = open_config(conf_filename);
  if (!cf)
  {
    log(LOG_ERR,"Could not open configuration file %s.",conf_filename);
    return -1;
  }
  retval = parse_config(cf,options);
  if (retval)
    return -1;

  return 0;
}

int getoptions(int argc, char **argv, or_options_t *options)
/**
A replacement for getargs() and getconfig() which uses the <popt> library to parse
both command-line arguments and configuration files. A specific configuration file
may be specified using the --ConfigFile option. If one is not specified, then the
configuration files at /etc/<cmd>rc and ~/.<cmd>rc will be loaded in that order (so
user preferences will override the ones specified in /etc. Note: <cmd> is the
basename() or argv[0] so one could run the same executeable through soft links to
get different configuration files loaded for different instances of the same program.
The ConfigFile option may only be used on the command-line. All other command-line
options may also be specified in configuration files. <popt> aliases are enabled
here so a user can define their own options in the /etc/popt or ~/.popt files.
RETURN VALUE: 0 on success, non-zero on error
**/
{
   char *ConfigFile;
   int Verbose;
   int code;
   poptContext optCon;
   char *cmd;
   struct poptOption opt_tab[] =
   {
      { "APPort", 'a', POPT_ARG_INT, &options->APPort, 0, "application proxy port", "<port>" },
      { "CoinWeight", 'w', POPT_ARG_FLOAT, &options->CoinWeight, 0, "coin weight used in determining routes", "<weight>" },
      { "ConfigFile", 'f', POPT_ARG_STRING, &ConfigFile, 0, "user specified configuration file", "<file>" },
      { "LogLevel", 'l', POPT_ARG_STRING, &options->LogLevel, 0, "emerg|alert|crit|err|warning|notice|info|debug", "<level>" },
      { "MaxConn", 'm', POPT_ARG_INT, &options->MaxConn, 0, "maximum number of incoming connections", "<max>" },
      { "OPPort", 'o', POPT_ARG_INT, &options->OPPort, 0, "onion proxy port", "<port>" },
      { "ORPort", 'p', POPT_ARG_INT, &options->ORPort, 0, "onion router port", "<port>" },
      { "PrivateKeyFile", 'k', POPT_ARG_STRING, &options->PrivateKeyFile, 0, "maximum number of incoming connections", "<max>" },
      { "RouterFile", 'r', POPT_ARG_STRING, &options->RouterFile, 0, "local port on which the onion proxy is running", "<port>" },
      { "TrafficShaping", 't', POPT_ARG_INT, &options->TrafficShaping, 0, "which traffic shaping policy to use", "<policy>" },
      { "Verbose", 'v', POPT_ARG_NONE, &Verbose, 0, "display options selected before execution", NULL },
      POPT_AUTOHELP  /* handles --usage and --help automatically */
      POPT_TABLEEND  /* marks end of table */
   };
   cmd = basename(argv[0]);
   optCon = poptGetContext(cmd,argc,(const char **)argv,opt_tab,0);

   poptReadDefaultConfig(optCon,0);       /* read <popt> alias definitions */

   bzero(options,sizeof(or_options_t));   /* zero out options initially */

   code = poptGetNextOpt(optCon);         /* first we handle command-line args */
   if ( code == -1 )
   {
      if ( ConfigFile )                   /* handle user-specified config file if any */
         code = poptReadOptions(optCon,ConfigFile);
      else                                /* load Default configuration files */
         code = poptReadDefaultOptions(cmd,optCon);
   }

   switch(code)                           /* error checking */
   {
   case INT_MIN:
      fprintf(stderr, "%s: Unable to open configuration file.\n", ConfigFile);
      break;
   case -1:
      if ( Verbose )                      /* display options upon user request */
      {
         printf("LogLevel=%s\n",options->LogLevel);
         printf("RouterFile=%s, PrivateKeyFile=%s\n",options->RouterFile,options->PrivateKeyFile);
         printf("ORPort=%d, OPPort=%d, APPort=%d\n",options->ORPort,options->OPPort,options->APPort);
         printf("CoinWeight=%6.4f, MaxConn=%d, TrafficShaping=%d\n",options->CoinWeight,options->MaxConn,options->TrafficShaping);
      }
      code = 0;
      break;
   default:
      poptPrintUsage(optCon, stderr, 0);
      fprintf(stderr, "%s: %s\n", poptBadOption(optCon, POPT_BADOPTION_NOALIAS), poptStrerror(code));
      break;
   }

   poptFreeContext(optCon);

   return code;
}