client/loclass/fileutils.c

   1 /*****************************************************************************
   2  * WARNING
   3  *
   4  * THIS CODE IS CREATED FOR EXPERIMENTATION AND EDUCATIONAL USE ONLY.
   5  *
   6  * USAGE OF THIS CODE IN OTHER WAYS MAY INFRINGE UPON THE INTELLECTUAL
   7  * PROPERTY OF OTHER PARTIES, SUCH AS INSIDE SECURE AND HID GLOBAL,
   8  * AND MAY EXPOSE YOU TO AN INFRINGEMENT ACTION FROM THOSE PARTIES.
   9  *
  10  * THIS CODE SHOULD NEVER BE USED TO INFRINGE PATENTS OR INTELLECTUAL PROPERTY RIGHTS.
  11  *
  12  *****************************************************************************
  13  *
  14  * This file is part of loclass. It is a reconstructon of the cipher engine
  15  * used in iClass, and RFID techology.
  16  *
  17  * The implementation is based on the work performed by
  18  * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
  19  * Milosch Meriac in the paper "Dismantling IClass".
  20  *
  21  * Copyright (C) 2014 Martin Holst Swende
  22  *
  23  * This is free software: you can redistribute it and/or modify
  24  * it under the terms of the GNU General Public License version 2 as published
  25  * by the Free Software Foundation.
  26  *
  27  * This file is distributed in the hope that it will be useful,
  28  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30  * GNU General Public License for more details.
  31  *
  32  * You should have received a copy of the GNU General Public License
  33  * along with loclass.  If not, see <http://www.gnu.org/licenses/>.
  34  *
  35  *
  36  *
  37  ****************************************************************************/
  38 #ifndef ON_DEVICE
  39
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <stdlib.h>
  43 #include <sys/stat.h>
  44 #include <stdarg.h>
  45 #include "fileutils.h"
  46 #include "ui.h"
  47 /**
  48  * @brief checks if a file exists
  49  * @param filename
  50  * @return
  51  */
  52 int fileExists(const char *filename) {
  53
  54 #ifdef _WIN32
  55         struct _stat st;
  56         int result = _stat(filename, &st);
  57 #else
  58         struct stat st;
  59         int result = stat(filename, &st);
  60 #endif
  61         return result == 0;
  62 }
  63
  64 int saveFile(const char *preferredName, const char *suffix, const void* data, size_t datalen)
  65 {
  66         int size = sizeof(char) * (strlen(preferredName)+strlen(suffix)+10);
  67         char * fileName = malloc(size);
  68
  69         memset(fileName,0,size);
  70         int num = 1;
  71         sprintf(fileName,"%s.%s", preferredName, suffix);
  72         while(fileExists(fileName))
  73         {
  74                 sprintf(fileName,"%s-%d.%s", preferredName, num, suffix);
  75                 num++;
  76         }
  77         /* We should have a valid filename now, e.g. dumpdata-3.bin */
  78
  79         /*Opening file for writing in binary mode*/
  80         FILE *fileHandle=fopen(fileName,"wb");
  81         if(!fileHandle) {
  82                 prnlog("Failed to write to file '%s'", fileName);
  83                 free(fileName);
  84                 return 1;
  85         }
  86         fwrite(data, 1, datalen, fileHandle);
  87         fclose(fileHandle);
  88         prnlog("Saved data to '%s'", fileName);
  89         free(fileName);
  90
  91         return 0;
  92 }
  93
  94 /**
  95  * Utility function to print to console. This is used consistently within the library instead
  96  * of printf, but it actually only calls printf (and adds a linebreak).
  97  * The reason to have this method is to
  98  * make it simple to plug this library into proxmark, which has this function already to
  99  * write also to a logfile. When doing so, just delete this function.
 100  * @param fmt
 101  */
 102 void prnlog(char *fmt, ...)
 103 {
 104         char buffer[2048] = {0};
 105         va_list args;
 106         va_start(args,fmt);
 107         vsprintf (buffer,fmt, args);
 108         va_end(args);
 109         PrintAndLog(buffer);
 110
 111 }
 112 #else //if we're on ARM
 113 void prnlog(char *fmt,...)
 114 {
 115         return;
 116 }
 117
 118 #endif