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 // declare it as uint32_t to achieve alignment to 4 Byte boundary
  20 static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
  21
  22 /* BigBuf memory layout:
  23 Pointer to highest available memory: BigBuf_hi
  24
  25     high BIGBUF_SIZE
  26     reserved = BigBuf_malloc()  subtracts amount from BigBuf_hi,
  27         low  0x00
  28 */
  29
  30 // High memory mark
  31 static uint16_t BigBuf_hi = BIGBUF_SIZE;
  32
  33 // pointer to the emulator memory.
  34 static uint8_t *emulator_memory = NULL;
  35
  36 // trace related variables
  37 static uint16_t traceLen = 0;
  38 int tracing = 1; //Last global one.. todo static?
  39
  40 // get the address of BigBuf
  41 uint8_t *BigBuf_get_addr(void)
  42 {
  43         return (uint8_t *)BigBuf;
  44 }
  45
  46 // get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
  47 uint8_t *BigBuf_get_EM_addr(void)
  48 {
  49         // not yet allocated
  50         if (emulator_memory == NULL)
  51                 emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
  52
  53         return emulator_memory;
  54 }
  55
  56 // clear ALL of BigBuf
  57 void BigBuf_Clear(void)
  58 {
  59         BigBuf_Clear_ext(true);
  60 }
  61
  62 // clear ALL of BigBuf
  63 void BigBuf_Clear_ext(bool verbose)
  64 {
  65         memset(BigBuf, 0, BIGBUF_SIZE);
  66         if (verbose)
  67                 Dbprintf("Buffer cleared (%i bytes)", BIGBUF_SIZE);
  68 }
  69
  70 void BigBuf_Clear_keep_EM(void)
  71 {
  72         memset(BigBuf, 0, BigBuf_hi);
  73 }
  74
  75 // allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
  76 // at the beginning of BigBuf is always for traces/samples
  77 uint8_t *BigBuf_malloc(uint16_t chunksize)
  78 {
  79         if (BigBuf_hi - chunksize < 0) {
  80                 return NULL;                                                    // no memory left
  81         } else {
  82                 chunksize = (chunksize + 3) & 0xfffc;   // round to next multiple of 4
  83                 BigBuf_hi -= chunksize;                                 // aligned to 4 Byte boundary
  84                 return (uint8_t *)BigBuf + BigBuf_hi;
  85         }
  86 }
  87
  88 // free ALL allocated chunks. The whole BigBuf is available for traces or samples again.
  89 void BigBuf_free(void)
  90 {
  91         BigBuf_hi = BIGBUF_SIZE;
  92         emulator_memory = NULL;
  93
  94         // shouldn't this empty BigBuf also?
  95 }
  96
  97 // free allocated chunks EXCEPT the emulator memory
  98 void BigBuf_free_keep_EM(void)
  99 {
 100         if (emulator_memory != NULL)
 101                 BigBuf_hi = emulator_memory - (uint8_t *)BigBuf;
 102         else
 103                 BigBuf_hi = BIGBUF_SIZE;
 104
 105         // shouldn't this empty BigBuf also?
 106 }
 107
 108 void BigBuf_print_status(void)
 109 {
 110         Dbprintf("Memory");
 111         Dbprintf("  BIGBUF_SIZE.............%d", BIGBUF_SIZE);
 112         Dbprintf("  Available memory........%d", BigBuf_hi);
 113         Dbprintf("Tracing");
 114         Dbprintf("  tracing ................%d", tracing);
 115         Dbprintf("  traceLen ...............%d", traceLen);
 116 }
 117
 118 // return the maximum trace length (i.e. the unallocated size of BigBuf)
 119 uint16_t BigBuf_max_traceLen(void)
 120 {
 121         return BigBuf_hi;
 122 }
 123
 124 void clear_trace() {
 125         traceLen = 0;
 126 }
 127
 128 void set_tracing(bool enable) {
 129         tracing = enable;
 130 }
 131
 132 /**
 133  * Get the number of bytes traced
 134  * @return
 135  */
 136 uint16_t BigBuf_get_traceLen(void)
 137 {
 138         return traceLen;
 139 }
 140
 141 /**
 142   This is a function to store traces. All protocols can use this generic tracer-function.
 143   The traces produced by calling this function can be fetched on the client-side
 144   by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
 145   annotation of commands/responses.
 146
 147 **/
 148 bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
 149 {
 150         if (!tracing) return FALSE;
 151
 152         uint8_t *trace = BigBuf_get_addr();
 153
 154         uint16_t num_paritybytes = (iLen-1)/8 + 1;      // number of valid paritybytes in *parity
 155         uint16_t duration = timestamp_end - timestamp_start;
 156
 157         // Return when trace is full
 158         if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= BigBuf_max_traceLen()) {
 159                 tracing = FALSE;        // don't trace any more
 160                 return FALSE;
 161         }
 162         // Traceformat:
 163         // 32 bits timestamp (little endian)
 164         // 16 bits duration (little endian)
 165         // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
 166         // y Bytes data
 167         // x Bytes parity (one byte per 8 bytes data)
 168
 169         // timestamp (start)
 170         trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
 171         trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
 172         trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
 173         trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
 174
 175         // duration
 176         trace[traceLen++] = ((duration >> 0) & 0xff);
 177         trace[traceLen++] = ((duration >> 8) & 0xff);
 178
 179         // data length
 180         trace[traceLen++] = ((iLen >> 0) & 0xff);
 181         trace[traceLen++] = ((iLen >> 8) & 0xff);
 182
 183         // readerToTag flag
 184         if (!readerToTag) {
 185                 trace[traceLen - 1] |= 0x80;
 186         }
 187
 188         // data bytes
 189         if (btBytes != NULL && iLen != 0) {
 190                 memcpy(trace + traceLen, btBytes, iLen);
 191         }
 192         traceLen += iLen;
 193
 194         // parity bytes
 195         if (num_paritybytes != 0) {
 196                 if (parity != NULL) {
 197                         memcpy(trace + traceLen, parity, num_paritybytes);
 198                 } else {
 199                         memset(trace + traceLen, 0x00, num_paritybytes);
 200                 }
 201         }
 202         traceLen += num_paritybytes;
 203
 204         return TRUE;
 205 }
 206
 207
 208 int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
 209 {
 210         /**
 211           Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
 212           that this logger takes number of bits as argument, not number of bytes.
 213           **/
 214
 215         if (!tracing) return FALSE;
 216
 217         uint8_t *trace = BigBuf_get_addr();
 218         uint16_t iLen = nbytes(iBits);
 219         // Return when trace is full
 220         if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
 221
 222         //Hitag traces appear to use this traceformat:
 223         // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
 224         // 32 bits parity
 225         // 8 bits size (number of bits in the trace entry, not number of bytes)
 226         // y Bytes data
 227
 228         rsamples += iSamples;
 229         trace[traceLen++] = ((rsamples >> 0) & 0xff);
 230         trace[traceLen++] = ((rsamples >> 8) & 0xff);
 231         trace[traceLen++] = ((rsamples >> 16) & 0xff);
 232         trace[traceLen++] = ((rsamples >> 24) & 0xff);
 233
 234         if (!readerToTag) {
 235                 trace[traceLen - 1] |= 0x80;
 236         }
 237
 238         trace[traceLen++] = ((dwParity >> 0) & 0xff);
 239         trace[traceLen++] = ((dwParity >> 8) & 0xff);
 240         trace[traceLen++] = ((dwParity >> 16) & 0xff);
 241         trace[traceLen++] = ((dwParity >> 24) & 0xff);
 242         trace[traceLen++] = iBits;
 243
 244         memcpy(trace + traceLen, btBytes, iLen);
 245         traceLen += iLen;
 246
 247         return TRUE;
 248 }
 249
 250
 251 // Emulator memory
 252 uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
 253         uint8_t* mem = BigBuf_get_EM_addr();
 254         if(offset+length < CARD_MEMORY_SIZE) {
 255                 memcpy(mem+offset, data, length);
 256                 return 0;
 257         } else {
 258                 Dbprintf("Error, trying to set memory outside of bounds! %d  > %d", (offset+length), CARD_MEMORY_SIZE);
 259                 return 1;
 260         }
 261 }