minor code cleanup

[proxmark3-svn] / armsrc / mifaresniff.c

diff --git a/armsrc/mifaresniff.c b/armsrc/mifaresniff.c
index 25c7780d49fda4a7539c7c8ea79a8f8d76acad5e..fed127725f9c3caf86b394a2e2fed1bf6e816711 100644 (file)
--- a/armsrc/mifaresniff.c
+++ b/armsrc/mifaresniff.c
@@ -11,5 +11,163 @@
 #include "mifaresniff.h"\r
 #include "apps.h"\r
 \r
+static int sniffState = SNF_INIT;\r
+static uint8_t sniffUIDType;\r
+static uint8_t sniffUID[8];\r
+static uint8_t sniffATQA[2];\r
+static uint8_t sniffSAK;\r
+static uint8_t sniffBuf[16];\r
+static uint32_t timerData = 0;\r
 \r
 \r
+bool MfSniffInit(void){\r
+       memset(sniffUID, 0x00, 8);\r
+       memset(sniffATQA, 0x00, 2);\r
+       sniffSAK = 0;\r
+       sniffUIDType = SNF_UID_4;\r
+\r
+       return FALSE;\r
+}\r
+\r
+bool MfSniffEnd(void){\r
+       LED_B_ON();\r
+       cmd_send(CMD_ACK,0,0,0,0,0);\r
+       LED_B_OFF();\r
+\r
+       return FALSE;\r
+}\r
+\r
+bool RAMFUNC MfSniffLogic(const uint8_t *data, uint16_t len, uint8_t *parity, uint16_t bitCnt, bool reader) {\r
+\r
+       if (reader && (len == 1) && (bitCnt == 7)) {            // reset on 7-Bit commands from reader\r
+               sniffState = SNF_INIT;\r
+       }\r
+\r
+       switch (sniffState) {\r
+               case SNF_INIT:{\r
+                       if ((len == 1) && (reader) && (bitCnt == 7) ) {  // REQA or WUPA from reader\r
+                               sniffUIDType = SNF_UID_4;\r
+                               memset(sniffUID, 0x00, 8);\r
+                               memset(sniffATQA, 0x00, 2);\r
+                               sniffSAK = 0;\r
+                               sniffState = SNF_WUPREQ;\r
+                       }\r
+                       break;\r
+               }\r
+               case SNF_WUPREQ:{\r
+                       if ((!reader) && (len == 2)) {          // ATQA from tag\r
+                               memcpy(sniffATQA, data, 2);\r
+                               sniffState = SNF_ATQA;\r
+                       }\r
+                       break;\r
+               }\r
+               case SNF_ATQA:{\r
+                       if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) { // Select ALL from reader\r
+                               sniffState = SNF_ANTICOL1;\r
+                       }\r
+                       break;\r
+               }\r
+               case SNF_ANTICOL1:{\r
+                       if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {  // UID from tag (CL1) \r
+                               memcpy(sniffUID + 3, data, 4);\r
+                               sniffState = SNF_UID1;\r
+                       }\r
+                       break;\r
+               }\r
+               case SNF_UID1:{\r
+                       if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {   // Select 4 Byte UID from reader\r
+                               sniffState = SNF_SAK;\r
+                       }\r
+                       break;\r
+               }\r
+               case SNF_SAK:{\r
+                       if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?\r
+                               sniffSAK = data[0];\r
+                               if (sniffUID[3] == 0x88) {                      // CL2 UID part to be expected\r
+                                       sniffState = SNF_ANTICOL2;\r
+                               } else {                                                        // select completed\r
+                                       sniffState = SNF_CARD_IDLE;\r
+                               }\r
+                       }\r
+                       break;\r
+               }\r
+               case SNF_ANTICOL2:{\r
+                       if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // CL2 UID \r
+                               memcpy(sniffUID, sniffUID+4, 3);\r
+                               memcpy(sniffUID+3, data, 4);\r
+                               sniffUIDType = SNF_UID_7;\r
+                               sniffState = SNF_UID2;\r
+                       }\r
+                       break;\r
+               }\r
+               case SNF_UID2:{\r
+                       if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {        // Select 2nd part of 7 Byte UID\r
+                               sniffState = SNF_SAK;\r
+                       }\r
+                       break;\r
+               }\r
+               case SNF_CARD_IDLE:{    // trace the card select sequence\r
+                       sniffBuf[0] = 0xFF;\r
+                       sniffBuf[1] = 0xFF;\r
+                       memcpy(sniffBuf + 2, sniffUID, 7);\r
+                       memcpy(sniffBuf + 9, sniffATQA, 2);\r
+                       sniffBuf[11] = sniffSAK;\r
+                       sniffBuf[12] = 0xFF;\r
+                       sniffBuf[13] = 0xFF;\r
+                       LogTrace(sniffBuf, 14, 0, 0, NULL, TRUE);\r
+               }       // intentionally no break;\r
+               case SNF_CARD_CMD:{             \r
+                       LogTrace(data, len, 0, 0, NULL, TRUE);\r
+                       sniffState = SNF_CARD_RESP;\r
+                       timerData = GetTickCount();\r
+                       break;\r
+               }\r
+               case SNF_CARD_RESP:{\r
+                       LogTrace(data, len, 0, 0, NULL, FALSE);\r
+                       sniffState = SNF_CARD_CMD;\r
+                       timerData = GetTickCount();\r
+                       break;\r
+               }\r
+       \r
+               default:\r
+                       sniffState = SNF_INIT;\r
+               break;\r
+       }\r
+\r
+\r
+       return FALSE;\r
+}\r
+\r
+bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {\r
+       if (traceLen && (GetTickCount() > timerData + maxTimeoutMs)) {\r
+               return intMfSniffSend();\r
+       }\r
+       return FALSE;\r
+}\r
+\r
+// internal sending function. not a RAMFUNC.\r
+bool intMfSniffSend() {\r
+\r
+       int pckSize = 0;\r
+       int pckLen = traceLen;\r
+       int pckNum = 0;\r
+\r
+       FpgaDisableSscDma();\r
+       while (pckLen > 0) {\r
+               pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);\r
+               LED_B_ON();\r
+               cmd_send(CMD_ACK, 1, pckSize, pckNum, trace + traceLen - pckLen, pckSize);\r
+               LED_B_OFF();\r
+\r
+               pckLen -= pckSize;\r
+               pckNum++;\r
+       }\r
+\r
+       LED_B_ON();\r
+       cmd_send(CMD_ACK,2,0,0,0,0);\r
+       LED_B_OFF();\r
+\r
+       iso14a_clear_trace();\r
+       \r
+       return TRUE;\r
+}\r