Merge pull request #884 from pwpiwi/fix_iclass_snoop

[proxmark3-svn] / armsrc / BigBuf.c

diff --git a/armsrc/BigBuf.c b/armsrc/BigBuf.c
index 7f56e9a014290c1a4b60cbfbacfc49bc9b8da02d..ce97e41f0dc4c15de703896c9424c49841cd9078 100644 (file)
--- a/armsrc/BigBuf.c
+++ b/armsrc/BigBuf.c
@@ -13,10 +13,19 @@
 #include "proxmark3.h"
 #include "apps.h"
 #include "string.h"
 #include "proxmark3.h"
 #include "apps.h"
 #include "string.h"

+#include "util.h"

 
 // BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
 // Also used to hold various smaller buffers and the Mifare Emulator Memory.
 
 
 // BigBuf is the large multi-purpose buffer, typically used to hold A/D samples or traces.
 // Also used to hold various smaller buffers and the Mifare Emulator Memory.
 

+/* BigBuf memory layout:
+Pointer to highest available memory: BigBuf_hi
+
+       high BIGBUF_SIZE
+       reserved = BigBuf_malloc()  subtracts amount from BigBuf_hi,
+       low  0x00
+*/
+

 // declare it as uint32_t to achieve alignment to 4 Byte boundary
 static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
 
 // declare it as uint32_t to achieve alignment to 4 Byte boundary
 static uint32_t BigBuf[BIGBUF_SIZE/sizeof(uint32_t)];
 


@@ -26,9 +35,9 @@ static uint16_t BigBuf_hi = BIGBUF_SIZE;
 // pointer to the emulator memory.
 static uint8_t *emulator_memory = NULL;
 
 // pointer to the emulator memory.
 static uint8_t *emulator_memory = NULL;
 

-// trace related global variables
-// (only one left). ToDo: make this static as well?
-uint16_t traceLen = 0;
+// trace related variables
+static uint32_t traceLen = 0;
+static bool tracing = true;

 
 
 // get the address of BigBuf
 
 
 // get the address of BigBuf


@@ -41,10 +50,11 @@ uint8_t *BigBuf_get_addr(void)
 // get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
 uint8_t *BigBuf_get_EM_addr(void)
 {
 // get the address of the emulator memory. Allocate part of Bigbuf for it, if not yet done
 uint8_t *BigBuf_get_EM_addr(void)
 {

-       if (emulator_memory == NULL) {          // not yet allocated
+       // not yet allocated
+       if (emulator_memory == NULL) {

                emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
        }
                emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE);
        }

-       
+

        return emulator_memory;
 }
 
        return emulator_memory;
 }
 


@@ -52,20 +62,38 @@ uint8_t *BigBuf_get_EM_addr(void)
 // clear ALL of BigBuf
 void BigBuf_Clear(void)
 {
 // clear ALL of BigBuf
 void BigBuf_Clear(void)
 {

-       memset(BigBuf,0,BIGBUF_SIZE);
-       Dbprintf("Buffer cleared (%i bytes)",BIGBUF_SIZE);
+       BigBuf_Clear_ext(true);
+}
+
+
+// clear ALL of BigBuf
+void BigBuf_Clear_ext(bool verbose)
+{
+       memset(BigBuf, 0, BIGBUF_SIZE);
+       if (verbose)
+               Dbprintf("Buffer cleared (%i bytes)", BIGBUF_SIZE);

 }
 
 
 }
 
 

+void BigBuf_Clear_EM(void){
+       memset(BigBuf_get_EM_addr(), 0, CARD_MEMORY_SIZE);
+}
+
+
+void BigBuf_Clear_keep_EM(void)
+{
+       memset(BigBuf, 0, BigBuf_hi);
+}
+

 // allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
 // at the beginning of BigBuf is always for traces/samples
 uint8_t *BigBuf_malloc(uint16_t chunksize)
 {
 // allocate a chunk of memory from BigBuf. We allocate high memory first. The unallocated memory
 // at the beginning of BigBuf is always for traces/samples
 uint8_t *BigBuf_malloc(uint16_t chunksize)
 {

-       if (BigBuf_hi - chunksize < 0) { 
-               return NULL;                                                    // no memory left
+       if (BigBuf_hi - chunksize < 0) {
+               return NULL;                            // no memory left

        } else {
        } else {

-               chunksize = (chunksize + 3) & 0xfffc;   // round to next multiple of 4
-               BigBuf_hi -= chunksize;                                 // aligned to 4 Byte boundary 
+               chunksize = (chunksize + 3) & 0xfffc;   // round to next multiple of 4
+               BigBuf_hi -= chunksize;                 // aligned to 4 Byte boundary

                return (uint8_t *)BigBuf + BigBuf_hi;
        }
 }
                return (uint8_t *)BigBuf + BigBuf_hi;
        }
 }


@@ -89,9 +117,179 @@ void BigBuf_free_keep_EM(void)
        }
 }
 
        }
 }
 

+void BigBuf_print_status(void)
+{
+       Dbprintf("Memory");
+       Dbprintf("  BIGBUF_SIZE.............%d", BIGBUF_SIZE);
+       Dbprintf("  Available memory........%d", BigBuf_hi);
+       Dbprintf("Tracing");
+       Dbprintf("  tracing ................%d", tracing);
+       Dbprintf("  traceLen ...............%d", traceLen);
+}
+

 
 // return the maximum trace length (i.e. the unallocated size of BigBuf)
 uint16_t BigBuf_max_traceLen(void)
 {
        return BigBuf_hi;
 }
 
 // return the maximum trace length (i.e. the unallocated size of BigBuf)
 uint16_t BigBuf_max_traceLen(void)
 {
        return BigBuf_hi;
 }

+
+
+void clear_trace() {
+       traceLen = 0;
+}
+
+
+void set_tracing(bool enable) {
+       tracing = enable;
+}
+
+
+bool get_tracing(void) {
+       return tracing;
+}
+
+
+/**
+ * Get the number of bytes traced
+ * @return
+ */
+uint16_t BigBuf_get_traceLen(void)
+{
+       return traceLen;
+}
+
+
+/**
+  This is a function to store traces. All protocols can use this generic tracer-function.
+  The traces produced by calling this function can be fetched on the client-side
+  by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
+  annotation of commands/responses.
+
+**/
+bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
+{
+       if (!tracing) return false;
+
+       uint8_t *trace = BigBuf_get_addr();
+
+       uint32_t num_paritybytes = (iLen-1)/8 + 1;  // number of valid paritybytes in *parity
+       uint32_t duration = timestamp_end - timestamp_start;
+
+       // Return when trace is full
+       uint16_t max_traceLen = BigBuf_max_traceLen();
+
+       if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) {
+               tracing = false;    // don't trace any more
+               return false;
+       }
+       // Traceformat:
+       // 32 bits timestamp (little endian)
+       // 16 bits duration (little endian)
+       // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
+       // y Bytes data
+       // x Bytes parity (one byte per 8 bytes data)
+
+       // timestamp (start)
+       trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
+       trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
+       trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
+       trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
+
+       // duration
+       trace[traceLen++] = ((duration >> 0) & 0xff);
+       trace[traceLen++] = ((duration >> 8) & 0xff);
+
+       // data length
+       trace[traceLen++] = ((iLen >> 0) & 0xff);
+       trace[traceLen++] = ((iLen >> 8) & 0xff);
+
+       // readerToTag flag
+       if (!readerToTag) {
+               trace[traceLen - 1] |= 0x80;
+       }
+
+       // data bytes
+       if (btBytes != NULL && iLen != 0) {
+               for (int i = 0; i < iLen; i++) {
+                       trace[traceLen++] = *btBytes++;
+               }
+       }
+
+       // parity bytes
+       if (num_paritybytes != 0) {
+               if (parity != NULL) {
+                       for (int i = 0; i < num_paritybytes; i++) {
+                               trace[traceLen++] = *parity++;
+                       }
+               } else {
+                       for (int i = 0; i < num_paritybytes; i++) {
+                               trace[traceLen++] = 0x00;
+                       }
+               }
+       }
+
+       return true;
+}
+
+
+int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
+{
+       /**
+         Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
+         that this logger takes number of bits as argument, not number of bytes.
+         **/
+
+       if (!tracing) return false;
+
+       uint8_t *trace = BigBuf_get_addr();
+       uint16_t iLen = nbytes(iBits);
+
+       // Return when trace is full
+       if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) {
+               return false;
+       }
+
+       //Hitag traces appear to use this traceformat:
+       // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
+       // 32 bits parity
+       // 8 bits size (number of bits in the trace entry, not number of bytes)
+       // y Bytes data
+
+
+
+       rsamples += iSamples;
+       trace[traceLen++] = ((rsamples >> 0) & 0xff);
+       trace[traceLen++] = ((rsamples >> 8) & 0xff);
+       trace[traceLen++] = ((rsamples >> 16) & 0xff);
+       trace[traceLen++] = ((rsamples >> 24) & 0xff);
+
+       if (!readerToTag) {
+               trace[traceLen - 1] |= 0x80;
+       }
+
+       trace[traceLen++] = ((dwParity >> 0) & 0xff);
+       trace[traceLen++] = ((dwParity >> 8) & 0xff);
+       trace[traceLen++] = ((dwParity >> 16) & 0xff);
+       trace[traceLen++] = ((dwParity >> 24) & 0xff);
+       trace[traceLen++] = iBits;
+
+       for (int i = 0; i < iLen; i++) {
+               trace[traceLen++] = *btBytes++;
+       }
+
+       return true;
+}
+
+
+// Emulator memory
+uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
+       uint8_t* mem = BigBuf_get_EM_addr();
+       if (offset+length < CARD_MEMORY_SIZE) {
+               memcpy(mem+offset, data, length);
+               return 0;
+       } else {
+               Dbprintf("Error, trying to set memory outside of bounds! %d  > %d", (offset+length), CARD_MEMORY_SIZE);
+               return 1;
+       }
+}