From bbc4c424b14ae4b479d4d479856ac0793022dc1d Mon Sep 17 00:00:00 2001
From: Roel Verdult <roel@libnfc.org>
Date: Fri, 1 May 2009 15:47:44 +0000
Subject: [PATCH] upload emulate.c

---
 emulate.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 emulate.c

diff --git a/emulate.c b/emulate.c
new file mode 100644
index 0000000..5153ba9
--- /dev/null
+++ b/emulate.c
@@ -0,0 +1,112 @@
+/*
+ 
+Public platform independent Near Field Communication (NFC) library
+Copyright (C) 2009, Roel Verdult
+ 
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "libnfc.h"
+
+static byte abtRecv[MAX_FRAME_LEN];
+static ui32 uiRecvBits;
+static dev_info* pdi;
+
+// ISO14443A Anti-Collision response
+byte abtAtqa      [2] = { 0x04,0x00 };
+byte abtUidBcc    [5] = { 0xDE,0xAD,0xBE,0xAF,0x62 };
+byte abtSak       [9] = { 0x08,0xb6,0xdd };
+
+int main(int argc, const char* argv[])
+{                       
+  byte* pbtTx = null;
+  ui32 uiTxBits;
+  
+  // Try to open the NFC reader
+  pdi = nfc_connect();
+  
+  if (pdi == INVALID_DEVICE_INFO)
+  {
+    printf("Error connecting NFC second reader\n");
+    return 1;
+  }
+
+  printf("\n");
+  printf("[+] Connected to NFC reader: %s\n",pdi->acName);
+  printf("[+] Try to break out the auto-emulation, this requires a second reader!\n");
+  printf("[+] To do this, please send any command after the anti-collision\n");
+  printf("[+] For example, send a RATS command or use the \"anticol\" tool\n");
+  if (!nfc_target_init(pdi,abtRecv,&uiRecvBits))
+  {
+    printf("Error: Could not come out of auto-emulation, no command was received\n");
+    return 1;
+  }
+  printf("[+] Received initiator command: ");
+  print_hex_bits(abtRecv,uiRecvBits);
+  printf("[+] Configuring communication\n");
+  nfc_configure(pdi,DCO_HANDLE_CRC,false);
+  nfc_configure(pdi,DCO_HANDLE_PARITY,true);
+  printf("[+] Done, the emulated tag is initialized\n\n");
+
+  while(true)
+  {
+    // Test if we received a frame
+    if (nfc_target_receive_bits(pdi,abtRecv,&uiRecvBits,null))
+    {
+      // Prepare the command to send back for the anti-collision request
+      switch(uiRecvBits)
+      {
+        case 7: // Request or Wakeup
+          pbtTx = abtAtqa;
+          uiTxBits = 16;
+          // New anti-collsion session started
+          printf("\n"); 
+        break;
+
+        case 16: // Select All
+          pbtTx = abtUidBcc;
+          uiTxBits = 40;
+        break;
+
+        case 72: // Select Tag
+          pbtTx = abtSak;
+          uiTxBits = 24;
+        break;
+
+        default: // unknown length?
+          uiTxBits = 0;
+        break;
+      }
+
+      printf("R: ");
+      print_hex_bits(abtRecv,uiRecvBits);
+
+      // Test if we know how to respond
+      if(uiTxBits)
+      {
+        // Send and print the command to the screen
+        nfc_target_send_bits(pdi,pbtTx,uiTxBits,null);
+        printf("T: ");
+        print_hex_bits(pbtTx,uiTxBits);
+      }
+    }
+  }
+
+  nfc_disconnect(pdi);
+}
+