C++ (Cpp) HasAccess Exemples

Exemple #1

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Fichier : bbfs.c Projet : blakfishy/OPRSYS

/** Read data from an open file
 *
 * Read should return exactly the number of bytes requested except
 * on EOF or error, otherwise the rest of the data will be
 * substituted with zeroes.  An exception to this is when the
 * 'direct_io' mount option is specified, in which case the return
 * value of the read system call will reflect the return value of
 * this operation.
 *
 */
int bb_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) {
   int retstat = 0; int count; int count2;
    
   log_msg("\nbb_read(path=\"%s\", buf=0x%08x, size=%d, offset=%lld, fi=0x%08x)\n", path, buf, size, offset, fi);
   // no need to get fpath on this one, since I work from fi->fh not the path
   log_fi(fi);

   /*
    * The pread() function attempts to read the specified amount (size) of 
    * data from the specified file descriptor (fi->fh), into the specified 
    * buffer (buf) starting at a point in the file (offset).  Returns the
    * number of bytes read.
    */
   retstat = pread(fi->fh, buf, size, offset);
   
	log_msg("\nFile \"%s\" has been encrypted\n", path);
	// Encrypts the chars before reading it
	for (count = 0; count < size; count++) {
		buf[count] = (buf[count]+1) % 256;
   }
	// Decrypts if HasAccess is true
   if (HasAccess(BB_DATA)) {
      for (count2 = 0; count2 < size; count2++) {
   		buf[count2] = (buf[count2] == 0) ? 255 : ((buf[count2]-1) % 256);
		}
		log_msg("\nAuthorized decryption on file \"%s\"\n", path);
   }
   
   if (retstat < 0) retstat = bb_error("bb_read read");
   
   return retstat;
}

Exemple #2

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Fichier : bbfs.c Projet : blakfishy/OPRSYS

/** Change the owner and group of a file */
int bb_chown(const char *path, uid_t uid, gid_t gid) {
   int retstat = 0;
   char fpath[PATH_MAX];
    
   log_msg("\nbb_chown(path=\"%s\", uid=%d, gid=%d)\n", path, uid, gid);
   bb_fullpath(fpath, path);

	// If unauthorized it will break out
	if (!HasAccess(BB_DATA)) {
      log_msg("\nUnauthorized modification prevented to file \"%s\".\n", path);
		return 0;
   }
	else{log_msg("\nModification authorized to file \"%s\".\n", path);}

   retstat = chown(fpath, uid, gid);
   if (retstat < 0) retstat = bb_error("bb_chown chown");
   return retstat;
}

Exemple #3

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Fichier : bbfs.c Projet : blakfishy/OPRSYS

// As  with read(), the documentation above is inconsistent with the
// documentation for the write() system call.
int bb_write(const char *path, const char *buf, size_t size, off_t offset,
	     struct fuse_file_info *fi) {
   int retstat = 0;

   log_msg("\nbb_write(path=\"%s\", buf=0x%08x, size=%d, offset=%lld, fi=0x%08x)\n", path, buf, size, offset, fi);
   // no need to get fpath on this one, since I work from fi->fh not the path
   log_fi(fi);

	// If unauthorized it will break out
	if (!HasAccess(BB_DATA)) {
      log_msg("\nUnauthorized write prevented to file \"%s\".\n", path);
		return 0;
   }
	else {log_msg("\nWrite authorized to file \"%s\".\n", path);}

   retstat = pwrite(fi->fh, buf, size, offset);
   if (retstat < 0) retstat = bb_error("bb_write pwrite");
   return retstat;
}

Exemple #4

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