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         BigBuf_Clear_ext(true);
  55 }
  56 // clear ALL of BigBuf
  57 void BigBuf_Clear_ext(bool verbose)
  58 {
  59         memset(BigBuf,0,BIGBUF_SIZE);
  60         if (verbose)
  61                 Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
  62 }
  63
  64
  65 // allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
  66 // at the beginning of BigBuf is always for traces/samples
  67 uint8_t *BigBuf_malloc(uint16_t chunksize)
  68 {
  69         if (BigBuf_hi - chunksize < 0) {
  70                 return NULL;                                                    // no memory left
  71         } else {
  72                 chunksize = (chunksize + 3) & 0xfffc;   // round to next multiple of 4
  73                 BigBuf_hi -= chunksize;                                 // aligned to 4 Byte boundary
  74                 return (uint8_t *)BigBuf + BigBuf_hi;
  75         }
  76 }
  77
  78
  79 // free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
  80 void BigBuf_free(void)
  81 {
  82         BigBuf_hi = BIGBUF_SIZE;
  83         emulator_memory = NULL;
  84 }
  85
  86
  87 // free allocated chunks EXCEPT the emulator memory
  88 void BigBuf_free_keep_EM(void)
  89 {
  90         if (emulator_memory != NULL) {
  91                 BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
  92         } else {
  93                 BigBuf_hi = BIGBUF_SIZE;
  94         }
  95 }
  96
  97 void BigBuf_print_status(void)
  98 {
  99         Dbprintf("Memory");
 100         Dbprintf("  BIGBUF_SIZE.............%d", BIGBUF_SIZE);
 101         Dbprintf("  BigBuf_hi  .............%d", BigBuf_hi);
 102         Dbprintf("Tracing");
 103         Dbprintf("  tracing ................%d", tracing);
 104         Dbprintf("  traceLen ...............%d", traceLen);
 105 }
 106
 107
 108 // return the maximum trace length (i.e. the unallocated size of BigBuf)
 109 uint16_t BigBuf_max_traceLen(void)
 110 {
 111         return BigBuf_hi;
 112 }
 113
 114 void clear_trace() {
 115         traceLen = 0;
 116 }
 117
 118 void set_tracing(bool enable) {
 119         tracing = enable;
 120 }
 121
 122 /**
 123  * Get the number of bytes traced
 124  * @return
 125  */
 126 uint16_t BigBuf_get_traceLen(void)
 127 {
 128         return traceLen;
 129 }
 130
 131 /**
 132   This is a function to store traces. All protocols can use this generic tracer-function.
 133   The traces produced by calling this function can be fetched on the client-side
 134   by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
 135   annotation of commands/responses.
 136
 137 **/
 138 bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
 139 {
 140         if (!tracing) return FALSE;
 141
 142         uint8_t *trace = BigBuf_get_addr();
 143
 144         uint16_t num_paritybytes = (iLen-1)/8 + 1;      // number of valid paritybytes in *parity
 145         uint16_t duration = timestamp_end - timestamp_start;
 146
 147         // Return when trace is full
 148         uint16_t max_traceLen = BigBuf_max_traceLen();
 149
 150         if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) {
 151                 tracing = FALSE;        // don't trace any more
 152                 return FALSE;
 153         }
 154         // Traceformat:
 155         // 32 bits timestamp (little endian)
 156         // 16 bits duration (little endian)
 157         // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
 158         // y Bytes data
 159         // x Bytes parity (one byte per 8 bytes data)
 160
 161         // timestamp (start)
 162         trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
 163         trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
 164         trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
 165         trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
 166
 167         // duration
 168         trace[traceLen++] = ((duration >> 0) & 0xff);
 169         trace[traceLen++] = ((duration >> 8) & 0xff);
 170
 171         // data length
 172         trace[traceLen++] = ((iLen >> 0) & 0xff);
 173         trace[traceLen++] = ((iLen >> 8) & 0xff);
 174
 175         // readerToTag flag
 176         if (!readerToTag) {
 177                 trace[traceLen - 1] |= 0x80;
 178         }
 179
 180         // data bytes
 181         if (btBytes != NULL && iLen != 0) {
 182                 memcpy(trace + traceLen, btBytes, iLen);
 183         }
 184         traceLen += iLen;
 185
 186         // parity bytes
 187         if (iLen != 0) {
 188                 if (parity != NULL) {
 189                         memcpy(trace + traceLen, parity, num_paritybytes);
 190                 } else {
 191                         memset(trace + traceLen, 0x00, num_paritybytes);
 192                 }
 193         }
 194         traceLen += num_paritybytes;
 195
 196         return TRUE;
 197 }
 198
 199
 200 int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
 201 {
 202         /**
 203           Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
 204           that this logger takes number of bits as argument, not number of bytes.
 205           **/
 206
 207         if (!tracing) return FALSE;
 208
 209         uint8_t *trace = BigBuf_get_addr();
 210         uint16_t iLen = nbytes(iBits);
 211         // Return when trace is full
 212         if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
 213
 214         //Hitag traces appear to use this traceformat:
 215         // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
 216         // 32 bits parity
 217         // 8 bits size (number of bits in the trace entry, not number of bytes)
 218         // y Bytes data
 219
 220         rsamples += iSamples;
 221         trace[traceLen++] = ((rsamples >> 0) & 0xff);
 222         trace[traceLen++] = ((rsamples >> 8) & 0xff);
 223         trace[traceLen++] = ((rsamples >> 16) & 0xff);
 224         trace[traceLen++] = ((rsamples >> 24) & 0xff);
 225
 226         if (!readerToTag) {
 227                 trace[traceLen - 1] |= 0x80;
 228         }
 229
 230         trace[traceLen++] = ((dwParity >> 0) & 0xff);
 231         trace[traceLen++] = ((dwParity >> 8) & 0xff);
 232         trace[traceLen++] = ((dwParity >> 16) & 0xff);
 233         trace[traceLen++] = ((dwParity >> 24) & 0xff);
 234         trace[traceLen++] = iBits;
 235
 236         memcpy(trace + traceLen, btBytes, iLen);
 237         traceLen += iLen;
 238
 239         return TRUE;
 240 }
 241
 242
 243 // Emulator memory
 244 uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
 245         uint8_t* mem = BigBuf_get_EM_addr();
 246         if(offset+length < CARD_MEMORY_SIZE)
 247         {
 248                 memcpy(mem+offset, data, length);
 249                 return 0;
 250         }else
 251         {
 252                 Dbprintf("Error, trying to set memory outside of bounds! %d  > %d", (offset+length), CARD_MEMORY_SIZE);
 253                 return 1;
 254         }
 255 }