add standalone module for sniffing iso14a to flash

This module is intentionally simple, and doesn't do anything fancy.

armsrc/Standalone/Makefile.hal

@@ -35,13 +35,16 @@ define KNOWN_STANDALONE_DEFINITIONS
 | HF_BOG          | 14a sniff with ULC/ULEV1/NTAG auth     |
 | (RDV4 only)     | storing in flashmem - Bogito           |
 +----------------------------------------------------------+
+| HF_14ASNIFF     | 14a sniff to flashmem                  |
+| (RDV4 only)     |                                        |
++----------------------------------------------------------+
 
 endef
 
 STANDALONE_MODES := LF_SAMYRUN LF_ICERUN LF_PROXBRUTE LF_HIDBRUTE
-STANDALONE_MODES += HF_YOUNG HF_MATTYRUN HF_COLIN HF_BOG
+STANDALONE_MODES += HF_YOUNG HF_MATTYRUN HF_COLIN HF_BOG HF_14ASNIFF
 STANDALONE_MODES_REQ_SMARTCARD :=
-STANDALONE_MODES_REQ_FLASH := HF_COLIN HF_BOG
+STANDALONE_MODES_REQ_FLASH := HF_COLIN HF_BOG HF_14ASNIFF
 ifneq ($(filter $(STANDALONE),$(STANDALONE_MODES)),)
     STANDALONE_PLATFORM_DEFS += -DWITH_STANDALONE_$(STANDALONE)
     ifneq ($(filter $(STANDALONE),$(STANDALONE_MODES_REQ_SMARTCARD)),)

armsrc/Standalone/Makefile.inc

@@ -33,4 +33,7 @@ endif
 ifneq (,$(findstring WITH_STANDALONE_HF_BOG,$(APP_CFLAGS)))
     SRC_STANDALONE = hf_bog.c
 endif
-
+# WITH_STANDALONE_HF_14ASNIFF
+ifneq (,$(findstring WITH_STANDALONE_HF_14ASNIFF,$(APP_CFLAGS)))
+    SRC_STANDALONE = hf_14asniff.c
+endif

armsrc/Standalone/hf_14asniff.c

@@ -0,0 +1,124 @@
+//-----------------------------------------------------------------------------
+// Copyright 2020 Michael Farrell <micolous+git@gmail.com>
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// main code for standalone HF/iso14a Sniff to flash
+//-----------------------------------------------------------------------------
+
+/*
+ * `hf_14asniff` passively sniffs ISO14a frames, and stores them in internal
+ * flash. It requires RDV4 hardware (for flash and battery).
+ *
+ * This module is similar to hf_bog (which only logs ULC/NTAG/ULEV1 auth).
+ *
+ * On entering stand-alone mode, this module will start sniffing ISO14a frames.
+ * This will be stored in the normal trace buffer (ie: in RAM -- will be lost
+ * at power-off).
+ *
+ * Short-pressing the button again will stop sniffing, and at _this_ point
+ * append trace data from RAM to a file in flash (hf_14asniff.trc) and unmount.
+ *
+ * Once the data is saved, standalone mode will exit.
+ *
+ * LEDs:
+ * - LED1: sniffing
+ * - LED2: sniffed tag command, turns off when finished sniffing reader command
+ * - LED3: sniffed reader command, turns off when finished sniffing tag command
+ * - LED4: unmounting/sync'ing flash (normally < 100ms)
+ *
+ * To retrieve trace data from flash:
+ *
+ * 1. mem spiffs dump o hf_14asniff.trc f trace.trc
+ *    Copies trace data file from flash to your PC.
+ *
+ * 2. trace load trace.trc
+ *    Loads trace data from a file into PC-side buffers.
+ *
+ * 3. For ISO14a: trace list 14a 1
+ *    For MIFARE Classic: trace list mf 1
+ *
+ *    Lists trace data from buffer without requesting it from PM3.
+ *
+ * This module emits debug strings during normal operation -- so try it out in
+ * the lab connected to PM3 client before taking it into the field.
+ *
+ * To delete the trace data from flash: 
+ *
+ * Caveats / notes:
+ * - Trace buffer will be cleared on starting stand-alone mode. Data in flash
+ *   will remain unless explicitly deleted.
+ * - This module will terminate if the trace buffer is full (and save data to
+ *   flash).
+ * - Like normal sniffing mode, timestamps overflow after 5 min 16 sec.
+ *   However, the trace buffer is sequential, so will be in the correct order.
+ */
+
+#include "standalone.h" // standalone definitions
+#include "proxmark3_arm.h"
+#include "iso14443a.h"
+#include "util.h"
+#include "spiffs.h"
+#include "appmain.h"
+#include "dbprint.h"
+#include "ticks.h"
+#include "BigBuf.h"
+
+#define HF_14ASNIFF_LOGFILE "hf_14asniff.trc"
+
+void DownloadTraceInstructions() {
+    Dbprintf("");
+    Dbprintf("To get the trace from flash and display it:");
+    Dbprintf("1. mem spiffs dump o "HF_14ASNIFF_LOGFILE" f trace.trc");
+    Dbprintf("2. trace load trace.trc");
+    Dbprintf("3. trace list 14a 1");
+}
+
+void ModInfo(void) {
+    DbpString("hf_14asniff: standalone 'hf 14a sniff', storing in flashmem");
+    DownloadTraceInstructions();
+}
+
+void RunMod() {
+    StandAloneMode();
+
+    Dbprintf("Starting standalone mode: hf_14asniff");
+    rdv40_spiffs_lazy_mount();
+
+    SniffIso14443a(0);
+
+    Dbprintf("Stopped sniffing");
+    SpinDelay(200);
+
+    // Write stuff to spiffs logfile
+    uint32_t trace_len = BigBuf_get_traceLen();
+    if (trace_len > 0) {
+        Dbprintf("[!] Trace length (bytes) = %u", trace_len);
+
+        uint8_t* trace_buffer = BigBuf_get_addr();
+        if (!exists_in_spiffs(HF_14ASNIFF_LOGFILE)) {
+            rdv40_spiffs_write(
+                HF_14ASNIFF_LOGFILE, trace_buffer, trace_len, RDV40_SPIFFS_SAFETY_SAFE);
+            Dbprintf("[!] Wrote trace to "HF_14ASNIFF_LOGFILE);
+        } else {
+            rdv40_spiffs_append(
+                HF_14ASNIFF_LOGFILE, trace_buffer, trace_len, RDV40_SPIFFS_SAFETY_SAFE);
+            Dbprintf("[!] Appended trace to "HF_14ASNIFF_LOGFILE);
+        }
+    } else {
+        Dbprintf("[!] Trace buffer is empty, nothing to write!");
+    }
+
+    LED_D_ON();
+    rdv40_spiffs_lazy_unmount();
+    LED_D_OFF();
+
+    SpinErr(LED_A, 200, 5);
+    SpinDelay(100);
+    
+    LEDsoff();
+    SpinDelay(300);
+    DownloadTraceInstructions();
+}