+//-----------------------------------------------------------------------------
+// Copyright (C) 2009 Michael Gernoth <michael at gernoth.net>
+// Copyright (C) 2010 iZsh <izsh at fail0verflow.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.
+//-----------------------------------------------------------------------------
+// Code for communicating with the proxmark3 hardware.
+//-----------------------------------------------------------------------------
+
+#include <pthread.h>
+
+#include "comms.h"
+#include "uart.h"
+#include "ui.h"
+#include "common.h"
+#include "data.h"
+#include "util_posix.h"
+
+// Declare globals.
+
+// Serial port that we are communicating with the PM3 on.
+serial_port sp;
+
+// If TRUE, then there is no active connection to the PM3, and we will drop commands sent.
+bool offline;
+
+// Transmit buffer.
+// TODO: Use locks and execute this on the main thread, rather than the receiver
+// thread. Running on the main thread means we need to be careful in the
+// flasher, as it means SendCommand is no longer async, and can't be used as a
+// buffer for a pending command when the connection is re-established.
+static UsbCommand txcmd;
+volatile static bool txcmd_pending = false;
+
+// Used by UsbReceiveCommand as a ring buffer for messages that are yet to be
+// processed by a command handler (WaitForResponse{,Timeout})
+static UsbCommand cmdBuffer[CMD_BUFFER_SIZE];
+
+// Points to the next empty position to write to
+static int cmd_head = 0;
+
+// Points to the position of the last unread command
+static int cmd_tail = 0;
+
+// to lock cmdBuffer operations from different threads
+static pthread_mutex_t cmdBufferMutex = PTHREAD_MUTEX_INITIALIZER;
+
+
+void SendCommand(UsbCommand *c) {
+ #if 0
+ printf("Sending %d bytes\n", sizeof(UsbCommand));
+ #endif
+
+ if (offline) {
+ PrintAndLog("Sending bytes to proxmark failed - offline");
+ return;
+ }
+ /**
+ The while-loop below causes hangups at times, when the pm3 unit is unresponsive
+ or disconnected. The main console thread is alive, but comm thread just spins here.
+ Not good.../holiman
+ **/
+ while(txcmd_pending);
+ txcmd = *c;
+ txcmd_pending = true;
+}
+
+
+/**
+ * @brief This method should be called when sending a new command to the pm3. In case any old
+ * responses from previous commands are stored in the buffer, a call to this method should clear them.
+ * A better method could have been to have explicit command-ACKS, so we can know which ACK goes to which
+ * operation. Right now we'll just have to live with this.
+ */
+void clearCommandBuffer()
+{
+ //This is a very simple operation
+ pthread_mutex_lock(&cmdBufferMutex);
+ cmd_tail = cmd_head;
+ pthread_mutex_unlock(&cmdBufferMutex);
+}
+
+/**
+ * @brief storeCommand stores a USB command in a circular buffer
+ * @param UC
+ */
+void storeCommand(UsbCommand *command)
+{
+ pthread_mutex_lock(&cmdBufferMutex);
+ if( (cmd_head+1) % CMD_BUFFER_SIZE == cmd_tail)
+ {
+ // If these two are equal, we're about to overwrite in the
+ // circular buffer.
+ PrintAndLog("WARNING: Command buffer about to overwrite command! This needs to be fixed!");
+ }
+
+ // Store the command at the 'head' location
+ UsbCommand* destination = &cmdBuffer[cmd_head];
+ memcpy(destination, command, sizeof(UsbCommand));
+
+ cmd_head = (cmd_head +1) % CMD_BUFFER_SIZE; //increment head and wrap
+ pthread_mutex_unlock(&cmdBufferMutex);
+}
+
+
+/**
+ * @brief getCommand gets a command from an internal circular buffer.
+ * @param response location to write command
+ * @return 1 if response was returned, 0 if nothing has been received
+ */
+int getCommand(UsbCommand* response)
+{
+ pthread_mutex_lock(&cmdBufferMutex);
+ //If head == tail, there's nothing to read, or if we just got initialized
+ if (cmd_head == cmd_tail){
+ pthread_mutex_unlock(&cmdBufferMutex);
+ return 0;
+ }
+
+ //Pick out the next unread command
+ UsbCommand* last_unread = &cmdBuffer[cmd_tail];
+ memcpy(response, last_unread, sizeof(UsbCommand));
+ //Increment tail - this is a circular buffer, so modulo buffer size
+ cmd_tail = (cmd_tail + 1) % CMD_BUFFER_SIZE;
+
+ pthread_mutex_unlock(&cmdBufferMutex);
+ return 1;
+}
+
+
+//-----------------------------------------------------------------------------
+// Entry point into our code: called whenever we received a packet over USB
+// that we weren't necessarily expecting, for example a debug print.
+//-----------------------------------------------------------------------------
+void UsbCommandReceived(UsbCommand *UC)
+{
+ switch(UC->cmd) {
+ // First check if we are handling a debug message
+ case CMD_DEBUG_PRINT_STRING: {
+ char s[USB_CMD_DATA_SIZE+1];
+ memset(s, 0x00, sizeof(s));
+ size_t len = MIN(UC->arg[0],USB_CMD_DATA_SIZE);
+ memcpy(s,UC->d.asBytes,len);
+ PrintAndLog("#db# %s", s);
+ return;
+ } break;
+
+ case CMD_DEBUG_PRINT_INTEGERS: {
+ PrintAndLog("#db# %08x, %08x, %08x \r\n", UC->arg[0], UC->arg[1], UC->arg[2]);
+ return;
+ } break;
+
+ case CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K: {
+ memcpy(sample_buf+(UC->arg[0]),UC->d.asBytes,UC->arg[1]);
+ return;
+ } break;
+
+ default:
+ storeCommand(UC);
+ break;
+ }
+
+}
+
+
+void
+#ifdef __has_attribute
+#if __has_attribute(force_align_arg_pointer)
+__attribute__((force_align_arg_pointer))
+#endif
+#endif
+*uart_receiver(void *targ) {
+ receiver_arg *arg = (receiver_arg*)targ;
+ size_t rxlen;
+ uint8_t rx[sizeof(UsbCommand)];
+ uint8_t *prx = rx;
+
+ while (arg->run) {
+ rxlen = 0;
+ if (uart_receive(sp, prx, sizeof(UsbCommand) - (prx-rx), &rxlen) && rxlen) {
+ prx += rxlen;
+ if (prx-rx < sizeof(UsbCommand)) {
+ continue;
+ }
+ UsbCommandReceived((UsbCommand*)rx);
+ }
+ prx = rx;
+
+ if(txcmd_pending) {
+ if (!uart_send(sp, (uint8_t*) &txcmd, sizeof(UsbCommand))) {
+ PrintAndLog("Sending bytes to proxmark failed");
+ }
+ txcmd_pending = false;
+ }
+ }
+
+ pthread_exit(NULL);
+ return NULL;
+}
+
+
+/**
+ * Waits for a certain response type. This method waits for a maximum of
+ * ms_timeout milliseconds for a specified response command.
+ *@brief WaitForResponseTimeout
+ * @param cmd command to wait for
+ * @param response struct to copy received command into.
+ * @param ms_timeout
+ * @return true if command was returned, otherwise false
+ */
+bool WaitForResponseTimeoutW(uint32_t cmd, UsbCommand* response, size_t ms_timeout, bool show_warning) {
+
+ UsbCommand resp;
+
+ if (response == NULL) {
+ response = &resp;
+ }
+
+ uint64_t start_time = msclock();
+
+ // Wait until the command is received
+ while (true) {
+ while(getCommand(response)) {
+ if(response->cmd == cmd){
+ return true;
+ }
+ }
+
+ if (msclock() - start_time > ms_timeout) {
+ break;
+ }
+
+ if (msclock() - start_time > 2000 && show_warning) {
+ PrintAndLog("Waiting for a response from the proxmark...");
+ PrintAndLog("You can cancel this operation by pressing the pm3 button");
+ show_warning = false;
+ }
+ }
+ return false;
+}
+
+
+bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout) {
+ return WaitForResponseTimeoutW(cmd, response, ms_timeout, true);
+}
+
+bool WaitForResponse(uint32_t cmd, UsbCommand* response) {
+ return WaitForResponseTimeoutW(cmd, response, -1, true);
+}
+
projects / proxmark3-svn / commitdiff