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[proxmark3-svn] / client / cmdhflegic.c

diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c
index cc4e0ff26be8cdfa09ff0e436ec170c51420f08d..381ad6b22e6ea2a3cd535538ffb797a7b5d58b1a 100644 (file)
--- a/client/cmdhflegic.c
+++ b/client/cmdhflegic.c
@@ -1,32 +1,29 @@
+//-----------------------------------------------------------------------------
+// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// High frequency Legic commands
+//-----------------------------------------------------------------------------
+
 #include <stdio.h>
 #include <string.h>
 #include "proxusb.h"
+#include "data.h"
+#include "ui.h"
 #include "cmdparser.h"
 #include "cmdhflegic.h"
 #include "cmdmain.h"
-#include "data.h"
-#include "ui.h"
-#include <string.h>
-#include <stdio.h>
 
 static int CmdHelp(const char *Cmd);
 
-int CmdLegicRFRead(const char *Cmd)
-{
-  int byte_count=0,offset=0;
-  sscanf(Cmd, "%i %i", &offset, &byte_count);
-  if(byte_count == 0) byte_count = 256;
-  if(byte_count + offset > 256) byte_count = 256 - offset;
-  UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
-  SendCommand(&c);
-  return 0;
-}
-
 static command_t CommandTable[] = 
 {
   {"help",        CmdHelp,        1, "This help"},
-  {"reader",      CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
   {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
+  {"reader",      CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
   {NULL, NULL, 0, NULL}
 };
 
@@ -46,7 +43,6 @@ int CmdHelp(const char *Cmd)
  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  *   This is based on information given in the talk held
  *  by Henryk Ploetz and Karsten Nohl at 26c3
- *  FIXME: will crash if sample buffer does not contain valid legic data
  */
 int CmdLegicDecode(const char *Cmd)
 {
@@ -147,7 +143,7 @@ int CmdLegicDecode(const char *Cmd)
   
   PrintAndLog("\nADF: User Area");
   
-    i = 22;  
+  i = 22;  
   for (n=0; n<64; n++) {
     segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
     segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
@@ -175,7 +171,7 @@ int CmdLegicDecode(const char *Cmd)
     
     if (wrc>0) {
       PrintAndLog("WRC protected area:");
-      for (k=0, j=0; k < wrc; k++, i++, j += 3) {
+      for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
         out_string[j+2] = ' ';
       };
@@ -188,7 +184,7 @@ int CmdLegicDecode(const char *Cmd)
     if (wrp>wrc) {
       PrintAndLog("Remaining write protected area:");
       
-      for (k=0, j=0; k < (wrp-wrc); k++, i++, j += 3) {
+      for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
         out_string[j+2] = ' ';
       };
@@ -203,7 +199,7 @@ int CmdLegicDecode(const char *Cmd)
     }
     
     PrintAndLog("Remaining segment payload:");
-    for (k=0, j=0; k < (segment_len - wrp - 5); k++, i++, j += 3) {
+    for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
       sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
       out_string[j+2] = ' ';
     };
@@ -218,3 +214,14 @@ int CmdLegicDecode(const char *Cmd)
   };
   return 0;
 }
+
+int CmdLegicRFRead(const char *Cmd)
+{
+  int byte_count=0,offset=0;
+  sscanf(Cmd, "%i %i", &offset, &byte_count);
+  if(byte_count == 0) byte_count = -1;
+  if(byte_count + offset > 1024) byte_count = 1024 - offset;
+  UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
+  SendCommand(&c);
+  return 0;
+}