/*
  *  Compilation: gcc -Wall ex1.c -o ex1 -lclamav
  *

  *  Copyright (C) 2013-2019 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
  *  Copyright (C) 2007-2013 Sourcefire, Inc.

  *  Author: Tomasz Kojm <tkojm@clamav.net>
  *

  *  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; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  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.

  */
 
 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <clamav.h>
 

 /*
  * Exit codes:
  *  0: clean
  *  1: infected
  *  2: error
  */
 

 int main(int argc, char **argv)
 {

     int fd, ret;
     unsigned long int size = 0;
     unsigned int sigs      = 0;
     long double mb;
     const char *virname;

     const char *filename;

     struct cl_engine *engine;

     struct cl_scan_options options;

     if (argc != 2) {
         printf("Usage: %s file\n", argv[0]);
         return 2;

     }
 

     filename = argv[1];
 

     if ((fd = open(argv[1], O_RDONLY)) == -1) {
         printf("Can't open file %s\n", argv[1]);
         return 2;

     }
 

     if ((ret = cl_init(CL_INIT_DEFAULT)) != CL_SUCCESS) {
         printf("Can't initialize libclamav: %s\n", cl_strerror(ret));
         return 2;

     }
 

     if (!(engine = cl_engine_new())) {
         printf("Can't create new engine\n");
         return 2;

     }
 

     /* Example version macro usage to determine if new feature is available */
 #if defined(LIBCLAMAV_VERSION_NUM) && (LIBCLAMAV_VERSION_NUM >= 0x090400)
     /* Example feature usage lowering max scan time to 15 seconds. */
     cl_engine_set_num(engine, CL_ENGINE_MAX_SCANTIME, 15000);
 #endif
 

     /* load all available databases from default directory */

     if ((ret = cl_load(cl_retdbdir(), engine, &sigs, CL_DB_STDOPT)) != CL_SUCCESS) {
         printf("cl_load: %s\n", cl_strerror(ret));
         close(fd);

         cl_engine_free(engine);

         return 2;

     }
 

     printf("Loaded %u signatures.\n", sigs);

     /* build engine */

     if ((ret = cl_engine_compile(engine)) != CL_SUCCESS) {
         printf("Database initialization error: %s\n", cl_strerror(ret));

         cl_engine_free(engine);

         close(fd);
         return 2;

     }
 

     /* scan file descriptor */

     memset(&options, 0, sizeof(struct cl_scan_options));

     options.parse |= ~0;                           /* enable all parsers */

     options.general |= CL_SCAN_GENERAL_HEURISTICS; /* enable heuristic alert options */
 

     if ((ret = cl_scandesc(fd, filename, &virname, &size, engine, &options)) == CL_VIRUS) {
         printf("Virus detected: %s\n", virname);

     } else {

         if (ret == CL_CLEAN) {
             printf("No virus detected.\n");
         } else {
             printf("Error: %s\n", cl_strerror(ret));
             cl_engine_free(engine);
             close(fd);
             return 2;
         }

     }

     close(fd);

     /* free memory */
     cl_engine_free(engine);
 

     /* calculate size of scanned data */

     mb = size * (CL_COUNT_PRECISION / 1024) / 1024.0;

     printf("Data scanned: %2.2Lf MB\n", mb);
 

     return ret == CL_VIRUS ? 1 : 0;

 }