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 void BigBuf_print_status(void)
  92 {
  93         Dbprintf("Memory");
  94         Dbprintf("  BIGBUF_SIZE.............%d", BIGBUF_SIZE);
  95         Dbprintf("  BigBuf_hi  .............%d", BigBuf_hi);
  96         Dbprintf("Tracing");
  97         Dbprintf("  tracing ................%d", tracing);
  98         Dbprintf("  traceLen ...............%d", traceLen);
  99 }
 100
 101
 102 // return the maximum trace length (i.e. the unallocated size of BigBuf)
 103 uint16_t BigBuf_max_traceLen(void)
 104 {
 105         return BigBuf_hi;
 106 }
 107
 108 void clear_trace() {
 109         traceLen = 0;
 110 }
 111
 112 void set_tracing(bool enable) {
 113         tracing = enable;
 114 }
 115
 116 /**
 117  * Get the number of bytes traced
 118  * @return
 119  */
 120 uint16_t BigBuf_get_traceLen(void)
 121 {
 122         return traceLen;
 123 }
 124
 125 /**
 126   This is a function to store traces. All protocols can use this generic tracer-function.
 127   The traces produced by calling this function can be fetched on the client-side
 128   by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
 129   annotation of commands/responses.
 130
 131 **/
 132 bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
 133 {
 134         if (!tracing) return FALSE;
 135
 136         uint8_t *trace = BigBuf_get_addr();
 137
 138         uint16_t num_paritybytes = (iLen-1)/8 + 1;      // number of valid paritybytes in *parity
 139         uint16_t duration = timestamp_end - timestamp_start;
 140
 141         // Return when trace is full
 142         uint16_t max_traceLen = BigBuf_max_traceLen();
 143
 144         if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) {
 145                 tracing = FALSE;        // don't trace any more
 146                 return FALSE;
 147         }
 148         // Traceformat:
 149         // 32 bits timestamp (little endian)
 150         // 16 bits duration (little endian)
 151         // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
 152         // y Bytes data
 153         // x Bytes parity (one byte per 8 bytes data)
 154
 155         // timestamp (start)
 156         trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
 157         trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
 158         trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
 159         trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
 160
 161         // duration
 162         trace[traceLen++] = ((duration >> 0) & 0xff);
 163         trace[traceLen++] = ((duration >> 8) & 0xff);
 164
 165         // data length
 166         trace[traceLen++] = ((iLen >> 0) & 0xff);
 167         trace[traceLen++] = ((iLen >> 8) & 0xff);
 168
 169         // readerToTag flag
 170         if (!readerToTag) {
 171                 trace[traceLen - 1] |= 0x80;
 172         }
 173
 174         // data bytes
 175         if (btBytes != NULL && iLen != 0) {
 176                 memcpy(trace + traceLen, btBytes, iLen);
 177         }
 178         traceLen += iLen;
 179
 180         // parity bytes
 181         if (parity != NULL && iLen != 0) {
 182                 memcpy(trace + traceLen, parity, num_paritybytes);
 183         }
 184         traceLen += num_paritybytes;
 185
 186         return TRUE;
 187 }
 188
 189
 190 int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
 191 {
 192         /**
 193           Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
 194           that this logger takes number of bits as argument, not number of bytes.
 195           **/
 196
 197         if (!tracing) return FALSE;
 198
 199         uint8_t *trace = BigBuf_get_addr();
 200         uint16_t iLen = nbytes(iBits);
 201         // Return when trace is full
 202         if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
 203
 204         //Hitag traces appear to use this traceformat:
 205         // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
 206         // 32 bits parity
 207         // 8 bits size (number of bits in the trace entry, not number of bytes)
 208         // y Bytes data
 209
 210         rsamples += iSamples;
 211         trace[traceLen++] = ((rsamples >> 0) & 0xff);
 212         trace[traceLen++] = ((rsamples >> 8) & 0xff);
 213         trace[traceLen++] = ((rsamples >> 16) & 0xff);
 214         trace[traceLen++] = ((rsamples >> 24) & 0xff);
 215
 216         if (!readerToTag) {
 217                 trace[traceLen - 1] |= 0x80;
 218         }
 219
 220         trace[traceLen++] = ((dwParity >> 0) & 0xff);
 221         trace[traceLen++] = ((dwParity >> 8) & 0xff);
 222         trace[traceLen++] = ((dwParity >> 16) & 0xff);
 223         trace[traceLen++] = ((dwParity >> 24) & 0xff);
 224         trace[traceLen++] = iBits;
 225
 226         memcpy(trace + traceLen, btBytes, iLen);
 227         traceLen += iLen;
 228
 229         return TRUE;
 230 }
 231 // Emulator memory
 232 uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
 233         uint8_t* mem = BigBuf_get_EM_addr();
 234         if(offset+length < CARD_MEMORY_SIZE)
 235         {
 236                 memcpy(mem+offset, data, length);
 237                 return 0;
 238         }else
 239         {
 240                 Dbprintf("Error, trying to set memory outside of bounds! %d  > %d", (offset+length), CARD_MEMORY_SIZE);
 241                 return 1;
 242         }
 243 }