I wrote a c code on visual studio to compare binary file to search a know virus in other binary file.
the code is running on my windows PC perfectly however it won’t compile on the Linux test of my collage.
the code receive a folder containing the files and the file of the virus
this is the code adjusted for Linux that i sent to the test
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <dirent.h>
#define SLASH "/"
#define FIFTH 0.2
#define NORMAL '0'
#define PARAMS 3
#define MAX 200
#define WELCOME_MES "Welcome to my Virus Scan!nnFolder to scan: "
#define FLOG_WELCOME "Anti-virus began! Welcome!nnFolder to scan:n"
#define COMP_MES "Scan Completed.nSee log path for results: antiVirus_log.txt"
#define INF_LAST "INFECTED (LAST 20%%)"
#define INF_FIRST "INFECTED (FIRST 20%%)"
#define INF "INFECTED"
int search_virus(char word[], char virus[], char name[], int finish_point, int sigLen, int starting_point);
char welcome_op(char directory_name[], char virus_name[], FILE* log);
int is_directory(const char* path);
int fast_or_regular(FILE* file, FILE* virus, char name[], char option, FILE* log);
int main(int argc, char** argv)
{
char full_path[MAX] = "";
char option = ' ';
FILE* fLog = fopen("antiVirus_log.txt", "w");
if (!fLog)
{
return 0;
}
FILE* virusSig = fopen(argv[2], "rb");// **** 2
if (!virusSig)
{
return 0;
}
if (argc != PARAMS)
{
return 0;
}
struct dirent* struct_lab;
DIR* ptr_lab = opendir(argv[1]);
if (!ptr_lab)
{
printf("Couldn't open the directory!");
return 0;
}
else
{
option = welcome_op(argv[1], argv[2], fLog);
while ((struct_lab = readdir(ptr_lab)) != NULL)//enter dir
{
if (!is_directory(struct_lab->d_name))
{
strcpy(full_path, argv[1]);//add name of the direcotry
strcat(full_path, SLASH);// add slash
strcat(full_path, struct_lab->d_name);// add the file name
FILE* check_file = fopen(full_path, "rb");// open
if (check_file)
{
fast_or_regular(check_file, virusSig, full_path, option, fLog);
fclose(check_file);
}
}
}
closedir(ptr_lab);
}
fclose(fLog);
printf("%s", COMP_MES);
fclose(virusSig);
getchar();
return(0);
}
/*
* prints the welcome message and ask the user to choose quick or normal scan
* input: directory_name: the name of the directory, virus name: virus file name, logL: writes the action there
* output: 0 if normal, anything else quick
*/
char welcome_op(char* directory_name, char* virus_name, FILE* log)
{
char op = ' ';
printf("%s%snVirus signature: %snPress 0 for normal scan or any other key for a quick scan: ", WELCOME_MES, directory_name, virus_name);
fprintf(log, "%s%snVirus signature:n%s", FLOG_WELCOME, directory_name, virus_name);
fflush(stdin);
op = getchar();
printf("nscanning began...nThis process may take several minutes...n");
(op == 1) ? fprintf(log, "nnScanning option:nQuick scannnResults:n") : fprintf(log, "nnScanning option:nRegular scannnResults:n");
return(op);
}
/*
* check if its directory
* input: path to the file
* output: 0 if not directory, 1 if is directory
*/
int is_directory(const char* path)
{
struct stat statbuf;
if (stat(path, &statbuf) != 0)
return 0;
return S_ISDIR(statbuf.st_mode);
}
/*
*send it 1 time full scan if option = 0 (regular) or split the file to 3 parts, 0-20%, 80-100%, 20-80%.
* copy the binary file into a string and send it to a func to scan it.
* if found it prints INFECTED and write it in log file.
* else print CLEAN and writes it in log file.
* input: file - the file we scanning, virus: virus's signiture, name: name of the file, option: quick or normal, log: file where we write the actions
* output: 0, just to finish the operation.
*/
int fast_or_regular(FILE* file, FILE* virus, char name[], char option, FILE* log)
{
int start = 0, fifth_of_len = 0, fourth_len = 0;
fseek(file, 0, SEEK_END);
long len = ftell(file);
rewind(file);
char* word = (char*)malloc(len);
fread(word, 1, len, file);//binary file into string
fseek(virus, 0, SEEK_END);
long lenSig = ftell(virus);
rewind(virus);
char* sig = (char*)malloc(lenSig);
fread(sig, 1, lenSig, virus);//binary file into string
if (option == '0')//normal
{
if (search_virus(word, sig, name, len, lenSig, start))
{
fprintf(log, "%s - INFECTED!n", name);
}
else
{
fprintf(log, "%s - cleann", name);
}
free(sig);
free(word);
return(0);
}
else//quick
{
fifth_of_len = len * FIFTH;
fourth_len = fifth_of_len * 4;
if (search_virus(word, sig, name, fifth_of_len, lenSig, start))//0-20
{
fprintf(log, "%s - %sn", name, INF_FIRST);
free(sig);
free(word);
return(0);
}
else if (search_virus(word, sig, name, len, lenSig, fourth_len))//80-100
{
fprintf(log, "%s - %sn", name, INF_LAST);
free(sig);
free(word);
return(0);
}
else if (search_virus(word, sig, name, fifth_of_len, lenSig, fourth_len))//20-80
{
fprintf(log, "%s - INFECTEDn", name);
free(sig);
free(word);
return(0);
}
}
fprintf(log, "%s - cleann", name);//clean
free(sig);
free(word);
return 0;
}
/*
* compare between the file and the virus signiture
* runs on the file untill it equal to the first symbol of the signiture, then runs on both add 1 to the counter
* if counter = len of sig returns same. else its different
* input: word: the word, virus: virus signiture to camper with, name: name of the file, finish_point: where to stop, starting_point: where to start
* output: 1 if same, 0 if not.
*/
int search_virus(char word[], char virus[], char name[], int finish_point, int sigLen, int starting_point)
{
long i = 0, j = 0, same = 0;
for (i = starting_point; i < finish_point; i++)//run on the word
{
if (word[i] == virus[0])
{
same = 1;
for (j = 1; j < sigLen; j++)//run on the virus sig
{
if (word[i + j] == virus[j])
{
same++;
}
else
{
break;
}
}
}
if (same == sigLen)
{
return(1);
}
}
return(0);
}
this is the code I run on windows, I add the dirent.h library to open the folder directory
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "dirent.h"
#define SLASH "\"
#define FIFTH 0.2
#define NORMAL '0'
#define PARAMS 3
#define MAX 200
#define WELCOME_MES "Welcome to my Virus Scan!nnFolder to scan: "
#define FLOG_WELCOME "Anti-virus began! Welcome!nnFolder to scan:n"
#define COMP_MES "Scan Completed.nSee log path for results: antiVirus_log.txt"
#define INF_LAST "INFECTED (LAST 20%%)"
#define INF_FIRST "INFECTED (FIRST 20%%)"
#define INF "INFECTED"
int search_virus(char word[], char virus[], char name[], int finish_point, int sigLen, int starting_point);
char welcome_op(char directory_name[], char virus_name[], FILE* log);
int is_directory(const char* path);
int fast_or_regular(FILE* file, FILE* virus, char name[], char option, FILE* log);
int main(int argc, char** argv)
{
char full_path[MAX] = "";
char option = ' '; //עבור בחירת מצב מהיר או רגיל
FILE* fLog = fopen("antiVirus_log.txt", "w");
if (!fLog)
{
return 0;
}
FILE* virusSig = fopen(argv[2], "rb");// **** 2
if (!virusSig)
{
return 0;
}
if (argc != PARAMS)
{
return;
}
struct dirent* struct_lab;
DIR* ptr_lab = opendir(argv[1]);
if (!ptr_lab)
{
printf("Couldn't open the directory!");
return 0;
}
else
{
option = welcome_op(argv[1], argv[2], fLog);
while ((struct_lab = readdir(ptr_lab)) != NULL)//enter dir
{
if (!is_directory(struct_lab->d_name))
{
strcpy(full_path, argv[1]);//add name of the direcotry
strcat(full_path, SLASH);// add slash
strcat(full_path, struct_lab->d_name);// add the file name
FILE* check_file = fopen(full_path, "rb");// open
if (check_file)
{
fast_or_regular(check_file, virusSig, full_path, option, fLog);
fclose(check_file);
}
}
}
closedir(ptr_lab);
}
fclose(fLog);
FILE* fLog = fopen("antiVirus_log.txt", "r");
printf("%s", COMP_MES);
fclose(virusSig);
getchar();
return(0);
}
/*
* prints the welcome message and ask the user to choose quick or normal scan
* input: directory_name: the name of the directory, virus name: virus file name, logL: writes the action there
* output: 0 if normal, anything else quick
*/
char welcome_op(char* directory_name, char* virus_name, FILE* log)
{
char op = ' ';
printf("%s%snVirus signature: %snPress 0 for normal scan or any other key for a quick scan: ", WELCOME_MES, directory_name, virus_name);
fprintf(log, "%s%snVirus signature:n%s", FLOG_WELCOME, directory_name, virus_name);
op = getch();
printf("nscanning began...nThis process may take several minutes...n");
(op == 1) ? fprintf(log, "nnScanning option:nQuick scannnResults:n") : fprintf(log, "nnScanning option:nRegular scannnResults:n");
return(op);
}
/*
* check if its directory
* input: path to the file
* output: 0 if not directory, 1 if is directory
*/
int is_directory(const char* path)
{
struct stat statbuf;
if (stat(path, &statbuf) != 0)
return 0;
return S_ISDIR(statbuf.st_mode);
}
/*
*send it 1 time full scan if option = 0 (regular) or split the file to 3 parts, 0-20%, 80-100%, 20-80%.
* copy the binary file into a string and send it to a func to scan it.
* if found it prints INFECTED and write it in log file.
* else print CLEAN and writes it in log file.
* input: file - the file we scanning, virus: virus's signiture, name: name of the file, option: quick or normal, log: file where we write the actions
* output: 0, just to finish the operation.
*/
int fast_or_regular(FILE* file, FILE* virus, char name[], char option, FILE* log)
{
int start = 0, fifth_of_len = 0, fourth_len = 0;
fseek(file, 0, SEEK_END);
long len = ftell(file);
rewind(file);
char* word = (char*)malloc(len);
fread(word, 1, len, file);//binary file into string
fseek(virus, 0, SEEK_END);
long lenSig = ftell(virus);
rewind(virus);
char* sig = (char*)malloc(virus);
fread(sig, 1, lenSig, virus);//binary file into string
if (option == '0')//normal
{
if (search_virus(word, sig, name, len, lenSig, start))
{
fprintf(log, "%s - INFECTED!n", name);
}
else
{
fprintf(log, "%s - cleann", name);
}
free(sig);
free(word);
return(0);
}
else//quick
{
fifth_of_len = len * FIFTH;
fourth_len = fifth_of_len * 4;
if (search_virus(word, sig, name, fifth_of_len, lenSig, start))//0-20
{
fprintf(log, "%s - %sn", name, INF_FIRST);
free(sig);
free(word);
return(0);
}
else if (search_virus(word, sig, name, len, lenSig, fourth_len))//80-100
{
fprintf(log, "%s - %sn", name, INF_LAST);
free(sig);
free(word);
return(0);
}
else if (search_virus(word, sig, name, fifth_of_len, lenSig, fourth_len))//20-80
{
fprintf(log, "%s - INFECTEDn", name);
free(sig);
free(word);
return(0);
}
}
fprintf(log, "%s - cleann", name);//clean
free(sig);
free(word);
return 0;
}
/*
* compare between the file and the virus signiture
* runs on the file untill it equal to the first symbol of the signiture, then runs on both add 1 to the counter
* if counter = len of sig returns same. else its different
* input: word: the word, virus: virus signiture to camper with, name: name of the file, finish_point: where to stop, starting_point: where to start
* output: 1 if same, 0 if not.
*/
int search_virus(char word[], char virus[], char name[], int finish_point, int sigLen, int starting_point)
{
long i = 0, j = 0, same = 0;
for (i = starting_point; i < finish_point; i++)//run on the word
{
if (word[i] == virus[0])
{
same = 1;
for (j = 1; j < sigLen; j++)//run on the virus sig
{
if (word[i + j] == virus[j])
{
same++;
}
else
{
break;
}
}
}
if (same == sigLen)
{
return(1);
}
}
return(0);
}
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Answer
Pasting your code into godbolt quickly reveals the problem. struct stat isn’t defined. For linux, you need to #include <sys/types.h> and #include <sys/stat.h> for struct stat. Pay attention to the remaining warning(s).