text: /*
  Copyright (c) 2013. The YARA Authors. All Rights Reserved.
  
  Redistribution and use in source and binary forms, with or without modification,
  are permitted provided that the following conditions are met:
  
  1. Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.
  
  2. Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation and/or
  other materials provided with the distribution.
  
  3. Neither the name of the copyright holder nor the names of its contributors
  may be used to endorse or promote products derived from this software without
  specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
  
  #ifndef _WIN32
  
  #include <dirent.h>
  #include <sys/stat.h>
  #include <time.h>
  #include <unistd.h>
  
  #else
  
  #include <windows.h>
  
  #endif
  
  #include <ctype.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <yara.h>
  
  #include "args.h"
  #include "common.h"
  
  #ifndef MAX_PATH
  #define MAX_PATH 256
  #endif
  
  #define MAX_ARGS_EXT_VAR 32
  
  typedef struct COMPILER_RESULTS
  {
    int errors;
    int warnings;
  
  } COMPILER_RESULTS;
  
  static char* atom_quality_table;
  static char* ext_vars[MAX_ARGS_EXT_VAR + 1];
  static bool ignore_warnings = false;
  static bool show_version = false;
  static bool show_help = false;
  static bool fail_on_warnings = false;
  static int max_strings_per_rule = DEFAULT_MAX_STRINGS_PER_RULE;
  
  #define USAGE_STRING \
    "Usage: yarac [OPTION]... [NAMESPACE:]SOURCE_FILE... OUTPUT_FILE"
  
  args_option_t options[] = {
      OPT_STRING(
          0,
          "atom-quality-table",
          &atom_quality_table,
          "path to a file with the atom quality table",
          "FILE"),
  
      OPT_STRING_MULTI(
          'd',
          "define",
          &ext_vars,
          MAX_ARGS_EXT_VAR,
          "define external variable",
          "VAR=VALUE"),
  
      OPT_BOOLEAN(0, "fail-on-warnings", &fail_on_warnings, "fail on warnings"),
  
      OPT_BOOLEAN('h', "help", &show_help, "show this help and exit"),
  
      OPT_INTEGER(
          0,
          "max-strings-per-rule",
          &max_strings_per_rule,
          "set maximum number of strings per rule (default=10000)",
          "NUMBER"),
  
      OPT_BOOLEAN('w', "no-warnings", &ignore_warnings, "disable warnings"),
  
      OPT_BOOLEAN('v', "version", &show_version, "show version information"),
  
      OPT_END()};
  
  static void report_error(
      int error_level,
      const char* file_name,
      int line_number,
      const YR_RULE* rule,
      const char* message,
      void* user_data)
  {
    char* msg_type;
  
    if (error_level == YARA_ERROR_LEVEL_ERROR)
    {
      msg_type = "error";
    }
    else if (!ignore_warnings)
    {
      COMPILER_RESULTS* compiler_results = (COMPILER_RESULTS*) user_data;
      compiler_results->warnings++;
      msg_type = "warning";
    }
    else
    {
      return;
    }
  
    if (rule != NULL)
    {
      fprintf(
          stderr,
          "%s(%d): %s in rule \"%s\": %s\n",
          file_name,
          line_number,
          msg_type,
          rule->identifier,
          message);
    }
    else
    {
      fprintf(
          stderr, "%s(%d): %s: %s\n", file_name, line_number, msg_type, message);
    }
  }
  
  static bool define_external_variables(YR_COMPILER* compiler)
  {
    for (int i = 0; ext_vars[i] != NULL; i++)
    {
      char* equal_sign = strchr(ext_vars[i], '=');
  
      if (!equal_sign)
      {
        fprintf(stderr, "error: wrong syntax for `-d` option.\n");
        return false;
      }
  
      // Replace the equal sign with null character to split the external
      // variable definition (i.e: myvar=somevalue) in two strings: identifier
      // and value.
  
      *equal_sign = '\0';
  
      char* identifier = ext_vars[i];
      char* value = equal_sign + 1;
  
      if (is_float(value))
      {
        yr_compiler_define_float_variable(compiler, identifier, atof(value));
      }
      else if (is_integer(value))
      {
        yr_compiler_define_integer_variable(compiler, identifier, atoi(value));
      }
      else if (strcmp(value, "true") == 0 || strcmp(value, "false") == 0)
      {
        yr_compiler_define_boolean_variable(
            compiler, identifier, strcmp(value, "true") == 0);
      }
      else
      {
        yr_compiler_define_string_variable(compiler, identifier, value);
      }
    }
  
    return true;
  }
  
  int main(int argc, const char** argv)
  {
    COMPILER_RESULTS cr;
  
    YR_COMPILER* compiler = NULL;
    YR_RULES* rules = NULL;
  
    int result;
  
    argc = args_parse(options, argc, argv);
  
    if (show_version)
    {
      printf("%s\n", YR_VERSION);
      return EXIT_SUCCESS;
    }
  
    if (show_help)
    {
      printf("%s\n\n", USAGE_STRING);
  
      args_print_usage(options, 40);
      printf("\nSend bug reports and suggestions to: vmalvarez@virustotal.com\n");
  
      return EXIT_SUCCESS;
    }
  
    if (argc < 2)
    {
      fprintf(stderr, "yarac: wrong number of arguments\n");
      fprintf(stderr, "%s\n\n", USAGE_STRING);
      fprintf(stderr, "Try `--help` for more options\n");
  
      exit_with_code(EXIT_FAILURE);
    }
  
    result = yr_initialize();
  
    if (result != ERROR_SUCCESS)
      exit_with_code(EXIT_FAILURE);
  
    if (yr_compiler_create(&compiler) != ERROR_SUCCESS)
      exit_with_code(EXIT_FAILURE);
  
    if (!define_external_variables(compiler))
      exit_with_code(EXIT_FAILURE);
  
    if (atom_quality_table != NULL)
    {
      result = yr_compiler_load_atom_quality_table(
          compiler, atom_quality_table, 0);
  
      if (result != ERROR_SUCCESS)
      {
        fprintf(stderr, "error loading atom quality table\n");
        exit_with_code(EXIT_FAILURE);
      }
    }
  
    cr.errors = 0;
    cr.warnings = 0;
  
    yr_set_configuration(YR_CONFIG_MAX_STRINGS_PER_RULE, &max_strings_per_rule);
    yr_compiler_set_callback(compiler, report_error, &cr);
  
    if (!compile_files(compiler, argc, argv))
      exit_with_code(EXIT_FAILURE);
  
    if (cr.errors > 0)
      exit_with_code(EXIT_FAILURE);
  
    if (fail_on_warnings && cr.warnings > 0)
      exit_with_code(EXIT_FAILURE);
  
    result = yr_compiler_get_rules(compiler, &rules);
  
    if (result != ERROR_SUCCESS)
    {
      fprintf(stderr, "error: %d\n", result);
      exit_with_code(EXIT_FAILURE);
    }
  
    result = yr_rules_save(rules, argv[argc - 1]);
  
    if (result != ERROR_SUCCESS)
    {
      fprintf(stderr, "error: %d\n", result);
      exit_with_code(EXIT_FAILURE);
    }
  
    result = EXIT_SUCCESS;
  
  _exit:
  
    if (compiler != NULL)
      yr_compiler_destroy(compiler);
  
    if (rules != NULL)
      yr_rules_destroy(rules);
  
    yr_finalize();
  
    return result;
  }
  