git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/BigBuf.c

   1 //-----------------------------------------------------------------------------
   2 // Jonathan Westhues, Aug 2005
   3 // Gerhard de Koning Gans, April 2008, May 2011
   4 //
   5 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   6 // at your option, any later version. See the LICENSE.txt file for the text of
   7 // the license.
   8 //-----------------------------------------------------------------------------
   9 // BigBuf and functions to allocate/free parts of it.
  10 //-----------------------------------------------------------------------------
  11
  12 #include <stdint.h>
  13 #include "proxmark3.h"
  14 #include "apps.h"
  15 #include "string.h"
  16
  17 // BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
  18 // Also used to hold various smaller buffers and the Mifare Emulator Memory.
  19
  20 // declare it as uint32_t to achieve alignment to 4 Byte boundary
  21 static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
  22
  23 // High memory mark
  24 static uint16_t BigBuf_hi = BIGBUF_SIZE;
  25
  26 // pointer to the emulator memory.
  27 static uint8_t *emulator_memory = NULL;
  28
  29 // trace related variables
  30 static uint16_t traceLen = 0;
  31 int tracing = 1; //Last global one.. todo static?
  32
  33 // get the address of BigBuf
  34 uint8_t *BigBuf_get_addr(void)
  35 {
  36         return (uint8_t *)BigBuf;
  37 }
  38
  39
  40 // get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
  41 uint8_t *BigBuf_get_EM_addr(void)
  42 {
  43         if (emulator_memory == NULL) {          // not yet allocated
  44                 emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
  45         }
  46
  47         return emulator_memory;
  48 }
  49
  50
  51 // clear ALL of BigBuf
  52 void BigBuf_Clear(void)
  53 {
  54         memset(BigBuf,0,BIGBUF_SIZE);
  55         Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
  56 }
  57
  58
  59 // allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
  60 // at the beginning of BigBuf is always for traces/samples
  61 uint8_t *BigBuf_malloc(uint16_t chunksize)
  62 {
  63         if (BigBuf_hi - chunksize < 0) {
  64                 return NULL;                                                    // no memory left
  65         } else {
  66                 chunksize = (chunksize + 3) & 0xfffc;   // round to next multiple of 4
  67                 BigBuf_hi -= chunksize;                                 // aligned to 4 Byte boundary
  68                 return (uint8_t *)BigBuf + BigBuf_hi;
  69         }
  70 }
  71
  72
  73 // free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
  74 void BigBuf_free(void)
  75 {
  76         BigBuf_hi = BIGBUF_SIZE;
  77         emulator_memory = NULL;
  78 }
  79
  80
  81 // free allocated chunks EXCEPT the emulator memory
  82 void BigBuf_free_keep_EM(void)
  83 {
  84         if (emulator_memory != NULL) {
  85                 BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
  86         } else {
  87                 BigBuf_hi = BIGBUF_SIZE;
  88         }
  89 }
  90
  91
  92 // return the maximum trace length (i.e. the unallocated size of BigBuf)
  93 uint16_t BigBuf_max_traceLen(void)
  94 {
  95         return BigBuf_hi;
  96 }
  97
  98 void clear_trace() {
  99         traceLen = 0;
 100 }
 101
 102 void set_tracing(bool enable) {
 103         tracing = enable;
 104 }
 105
 106 /**
 107  * Get the number of bytes traced
 108  * @return
 109  */
 110 uint16_t BigBuf_get_traceLen(void)
 111 {
 112         return traceLen;
 113 }
 114
 115 /**
 116   This is a function to store traces. All protocols can use this generic tracer-function.
 117   The traces produced by calling this function can be fetched on the client-side
 118   by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
 119   annotation of commands/responses.
 120
 121 **/
 122 bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
 123 {
 124         if (!tracing) return FALSE;
 125
 126         uint8_t *trace = BigBuf_get_addr();
 127
 128         uint16_t num_paritybytes = (iLen-1)/8 + 1;      // number of valid paritybytes in *parity
 129         uint16_t duration = timestamp_end - timestamp_start;
 130
 131         // Return when trace is full
 132         uint16_t max_traceLen = BigBuf_max_traceLen();
 133
 134         if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) {
 135                 tracing = FALSE;        // don't trace any more
 136                 return FALSE;
 137         }
 138         // Traceformat:
 139         // 32 bits timestamp (little endian)
 140         // 16 bits duration (little endian)
 141         // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
 142         // y Bytes data
 143         // x Bytes parity (one byte per 8 bytes data)
 144
 145         // timestamp (start)
 146         trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
 147         trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
 148         trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
 149         trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
 150
 151         // duration
 152         trace[traceLen++] = ((duration >> 0) & 0xff);
 153         trace[traceLen++] = ((duration >> 8) & 0xff);
 154
 155         // data length
 156         trace[traceLen++] = ((iLen >> 0) & 0xff);
 157         trace[traceLen++] = ((iLen >> 8) & 0xff);
 158
 159         // readerToTag flag
 160         if (!readerToTag) {
 161                 trace[traceLen - 1] |= 0x80;
 162         }
 163
 164         // data bytes
 165         if (btBytes != NULL && iLen != 0) {
 166                 memcpy(trace + traceLen, btBytes, iLen);
 167         }
 168         traceLen += iLen;
 169
 170         // parity bytes
 171         if (parity != NULL && iLen != 0) {
 172                 memcpy(trace + traceLen, parity, num_paritybytes);
 173         }
 174         traceLen += num_paritybytes;
 175
 176         return TRUE;
 177 }
 178
 179
 180 int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
 181 {
 182         /**
 183           Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
 184           that this logger takes number of bits as argument, not number of bytes.
 185           **/
 186
 187         if (!tracing) return FALSE;
 188
 189         uint8_t *trace = BigBuf_get_addr();
 190         uint16_t iLen = nbytes(iBits);
 191         // Return when trace is full
 192         if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
 193
 194         //Hitag traces appear to use this traceformat:
 195         // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
 196         // 32 bits parity
 197         // 8 bits size (number of bits in the trace entry, not number of bytes)
 198         // y Bytes data
 199
 200         rsamples += iSamples;
 201         trace[traceLen++] = ((rsamples >> 0) & 0xff);
 202         trace[traceLen++] = ((rsamples >> 8) & 0xff);
 203         trace[traceLen++] = ((rsamples >> 16) & 0xff);
 204         trace[traceLen++] = ((rsamples >> 24) & 0xff);
 205
 206         if (!readerToTag) {
 207                 trace[traceLen - 1] |= 0x80;
 208         }
 209
 210         trace[traceLen++] = ((dwParity >> 0) & 0xff);
 211         trace[traceLen++] = ((dwParity >> 8) & 0xff);
 212         trace[traceLen++] = ((dwParity >> 16) & 0xff);
 213         trace[traceLen++] = ((dwParity >> 24) & 0xff);
 214         trace[traceLen++] = iBits;
 215
 216         memcpy(trace + traceLen, btBytes, iLen);
 217         traceLen += iLen;
 218
 219         return TRUE;
 220 }
 221 // Emulator memory
 222 uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
 223         uint8_t* mem = BigBuf_get_EM_addr();
 224         if(offset+length < CARD_MEMORY_SIZE)
 225         {
 226                 memcpy(mem+offset, data, length);
 227                 return 0;
 228         }else
 229         {
 230                 Dbprintf("Error, trying to set memory outside of bounds! %d  > %d", (offset+length), CARD_MEMORY_SIZE);
 231                 return 1;
 232         }
 233 }