X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/7d5ebac99397fe7661760259377a4f222fdb92cb..1477ba8a3c34f9b7eb624167251efea927755194:/armsrc/BigBuf.c diff --git a/armsrc/BigBuf.c b/armsrc/BigBuf.c index 7f56e9a0..ce97e41f 100644 --- a/armsrc/BigBuf.c +++ b/armsrc/BigBuf.c @@ -13,10 +13,19 @@ #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 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)]; @@ -26,9 +35,9 @@ static uint16_t BigBuf_hi = BIGBUF_SIZE; // 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 @@ -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) { - if (emulator_memory == NULL) { // not yet allocated + // not yet allocated + if (emulator_memory == NULL) { emulator_memory = BigBuf_malloc(CARD_MEMORY_SIZE); } - + return emulator_memory; } @@ -52,20 +62,38 @@ uint8_t *BigBuf_get_EM_addr(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) { - if (BigBuf_hi - chunksize < 0) { - return NULL; // no memory left + if (BigBuf_hi - chunksize < 0) { + return NULL; // no memory left } 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; } } @@ -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; } + + +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 ' 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; + } +}