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 #include "util.h"
  17
  18 // BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
  19 // Also used to hold various smaller buffers and the Mifare Emulator Memory.
  20
  21 // declare it as uint32_t to achieve alignment to 4 Byte boundary
  22 static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
  23
  24 // High memory mark
  25 static uint16_t BigBuf_hi = BIGBUF_SIZE;
  26
  27 // pointer to the emulator memory.
  28 static uint8_t *emulator_memory = NULL;
  29
  30 // trace related variables
  31 static uint16_t traceLen = 0;
  32 int tracing = 1; //Last global one.. todo static?
  33
  34 // get the address of BigBuf
  35 uint8_t *BigBuf_get_addr(void)
  36 {
  37         return (uint8_t *)BigBuf;
  38 }
  39
  40
  41 // get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
  42 uint8_t *BigBuf_get_EM_addr(void)
  43 {
  44         if (emulator_memory == NULL) {          // not yet allocated
  45                 emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
  46         }
  47
  48         return emulator_memory;
  49 }
  50
  51
  52 // clear ALL of BigBuf
  53 void BigBuf_Clear(void)
  54 {
  55         BigBuf_Clear_ext(true);
  56 }
  57 // clear ALL of BigBuf
  58 void BigBuf_Clear_ext(bool verbose)
  59 {
  60         memset(BigBuf,0,BIGBUF_SIZE);
  61         if (verbose)
  62                 Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
  63 }
  64
  65 void BigBuf_Clear_keep_EM(void)
  66 {
  67         memset(BigBuf,0,BigBuf_hi);
  68 }
  69
  70 // allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
  71 // at the beginning of BigBuf is always for traces/samples
  72 uint8_t *BigBuf_malloc(uint16_t chunksize)
  73 {
  74         if (BigBuf_hi - chunksize < 0) {
  75                 return NULL;                                                    // no memory left
  76         } else {
  77                 chunksize = (chunksize + 3) & 0xfffc;   // round to next multiple of 4
  78                 BigBuf_hi -= chunksize;                                 // aligned to 4 Byte boundary
  79                 return (uint8_t *)BigBuf + BigBuf_hi;
  80         }
  81 }
  82
  83
  84 // free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
  85 void BigBuf_free(void)
  86 {
  87         BigBuf_hi = BIGBUF_SIZE;
  88         emulator_memory = NULL;
  89 }
  90
  91
  92 // free allocated chunks EXCEPT the emulator memory
  93 void BigBuf_free_keep_EM(void)
  94 {
  95         if (emulator_memory != NULL) {
  96                 BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
  97         } else {
  98                 BigBuf_hi = BIGBUF_SIZE;
  99         }
 100 }
 101
 102 void BigBuf_print_status(void)
 103 {
 104         Dbprintf("Memory");
 105         Dbprintf("  BIGBUF_SIZE.............%d", BIGBUF_SIZE);
 106         Dbprintf("  BigBuf_hi  .............%d", BigBuf_hi);
 107         Dbprintf("Tracing");
 108         Dbprintf("  tracing ................%d", tracing);
 109         Dbprintf("  traceLen ...............%d", traceLen);
 110 }
 111
 112
 113 // return the maximum trace length (i.e. the unallocated size of BigBuf)
 114 uint16_t BigBuf_max_traceLen(void)
 115 {
 116         return BigBuf_hi;
 117 }
 118
 119 void clear_trace() {
 120         traceLen = 0;
 121 }
 122
 123 void set_tracing(bool enable) {
 124         tracing = enable;
 125 }
 126
 127 /**
 128  * Get the number of bytes traced
 129  * @return
 130  */
 131 uint16_t BigBuf_get_traceLen(void)
 132 {
 133         return traceLen;
 134 }
 135
 136 /**
 137   This is a function to store traces. All protocols can use this generic tracer-function.
 138   The traces produced by calling this function can be fetched on the client-side
 139   by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
 140   annotation of commands/responses.
 141
 142 **/
 143 bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
 144 {
 145         if (!tracing) return FALSE;
 146
 147         uint8_t *trace = BigBuf_get_addr();
 148
 149         uint16_t num_paritybytes = (iLen-1)/8 + 1;      // number of valid paritybytes in *parity
 150         uint16_t duration = timestamp_end - timestamp_start;
 151
 152         // Return when trace is full
 153         uint16_t max_traceLen = BigBuf_max_traceLen();
 154
 155         if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) {
 156                 tracing = FALSE;        // don't trace any more
 157                 return FALSE;
 158         }
 159         // Traceformat:
 160         // 32 bits timestamp (little endian)
 161         // 16 bits duration (little endian)
 162         // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
 163         // y Bytes data
 164         // x Bytes parity (one byte per 8 bytes data)
 165
 166         // timestamp (start)
 167         trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
 168         trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
 169         trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
 170         trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
 171
 172         // duration
 173         trace[traceLen++] = ((duration >> 0) & 0xff);
 174         trace[traceLen++] = ((duration >> 8) & 0xff);
 175
 176         // data length
 177         trace[traceLen++] = ((iLen >> 0) & 0xff);
 178         trace[traceLen++] = ((iLen >> 8) & 0xff);
 179
 180         // readerToTag flag
 181         if (!readerToTag) {
 182                 trace[traceLen - 1] |= 0x80;
 183         }
 184
 185         // data bytes
 186         if (btBytes != NULL && iLen != 0) {
 187                 memcpy(trace + traceLen, btBytes, iLen);
 188         }
 189         traceLen += iLen;
 190
 191         // parity bytes
 192         if (num_paritybytes != 0) {
 193                 if (parity != NULL) {
 194                         memcpy(trace + traceLen, parity, num_paritybytes);
 195                 } else {
 196                         memset(trace + traceLen, 0x00, num_paritybytes);
 197                 }
 198         }
 199         traceLen += num_paritybytes;
 200
 201         return TRUE;
 202 }
 203
 204
 205 int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
 206 {
 207         /**
 208           Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
 209           that this logger takes number of bits as argument, not number of bytes.
 210           **/
 211
 212         if (!tracing) return FALSE;
 213
 214         uint8_t *trace = BigBuf_get_addr();
 215         uint16_t iLen = nbytes(iBits);
 216         // Return when trace is full
 217         if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
 218
 219         //Hitag traces appear to use this traceformat:
 220         // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
 221         // 32 bits parity
 222         // 8 bits size (number of bits in the trace entry, not number of bytes)
 223         // y Bytes data
 224
 225         rsamples += iSamples;
 226         trace[traceLen++] = ((rsamples >> 0) & 0xff);
 227         trace[traceLen++] = ((rsamples >> 8) & 0xff);
 228         trace[traceLen++] = ((rsamples >> 16) & 0xff);
 229         trace[traceLen++] = ((rsamples >> 24) & 0xff);
 230
 231         if (!readerToTag) {
 232                 trace[traceLen - 1] |= 0x80;
 233         }
 234
 235         trace[traceLen++] = ((dwParity >> 0) & 0xff);
 236         trace[traceLen++] = ((dwParity >> 8) & 0xff);
 237         trace[traceLen++] = ((dwParity >> 16) & 0xff);
 238         trace[traceLen++] = ((dwParity >> 24) & 0xff);
 239         trace[traceLen++] = iBits;
 240
 241         memcpy(trace + traceLen, btBytes, iLen);
 242         traceLen += iLen;
 243
 244         return TRUE;
 245 }
 246
 247
 248 // Emulator memory
 249 uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
 250         uint8_t* mem = BigBuf_get_EM_addr();
 251         if(offset+length < CARD_MEMORY_SIZE)
 252         {
 253                 memcpy(mem+offset, data, length);
 254                 return 0;
 255         }else
 256         {
 257                 Dbprintf("Error, trying to set memory outside of bounds! %d  > %d", (offset+length), CARD_MEMORY_SIZE);
 258                 return 1;
 259         }
 260 }