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#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>

#define ERROR 1
#define PROC_INDEX 0
#define PATH_INDEX 1
#define SIGN_INDEX 2

int isElf(FILE* file);
int checkInfected(FILE* file,char* sign);
void findSign(char* path, char* sign);
char* getFullPath(char* parent,char* child);

int main(int argc, char* argv[])
{
	int errorInFiles = 0;
	if(argc != 3)
	{
		printf("Usage: %s <dir path> <virus signature file>\n",argv[PROC_INDEX]);
		return ERROR;
	}
	FILE* virusSign = fopen(argv[SIGN_INDEX],"rb");
	if(!virusSign)
	{
		printf("Error opening signature file!\n");
		errorInFiles = ERROR;
	}
	DIR* path = opendir(argv[PATH_INDEX]);
	if(!path)
	{
		printf("Error opening path directory file!\n");
		errorInFiles = ERROR;
	}
	if(errorInFiles) return ERROR;
	
	findSign(path,virusSign);
	
	fclose(virusSign);
	closedir(path);
	
	
	return 0;
}

int isElf(FILE* file)
{
	char* header = malloc(strlen("ELF"));
	fread(header,sizeof(unsigned char), strlen("ELF"), file);
	if(!strcmp(header,"ELF"))	return 1;
	return 0;
}

int checkInfected(FILE* file,char* sign)
{
	int streak = 0,flag = 0;
	FILE* fp = fopen(file,"rb");
	if(!fp)
	{	
		printf("Error opening inner file!\n");
		return 0;
	}
	while(
}

void findSign(char* path, char* sign)
{
	struct dirent* entry;
	DIR* currDir = opendir(path);
	DIR* dir;
	FILE* fp;
	char* entryPath;
	while((entry = readdir(currDir)) != 0)
	{
		entryPath = getFullPath(path,entry->d_name);
		if((dir = opendir(entryPath))
		{
			closedir(dir);
			findSign(entryPath,sign);
		}
		else if((fp = fopen(entryPath,"rb"))
		{
			if(isElf(fp))
			{	
				if(checkInfected(fp,sign))	printf("%s is infected!\n",entryPath);
			}
		}
		free(entryPath);
	}
	closedir(currDir);
}

char* getFullPath(char* parent,char* child)
{
	char* fullName = malloc(strlen(parent) + strlen(child) + 1);
	memset(fullName,0,strlen(parent) + strlen(child) + 1);
	strncpy(fullName,parent,strlen(parent));
	strncat(fullName,"/",1);
	strncat(fullName,child,strlen(child));
	return fullName;
}