X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/afdcb8c159a73aba95a017f1cfec98e8fa2b93c1..refs/pull/524/head:/client/cmdmain.c

diff --git a/client/cmdmain.c b/client/cmdmain.c
index e199e127..739d68e1 100644
--- a/client/cmdmain.c
+++ b/client/cmdmain.c
@@ -36,6 +36,15 @@ static int CmdHelp(const char *Cmd);
 static int CmdQuit(const char *Cmd);
 static int CmdRev(const char *Cmd);
 
+//For storing command that are received from the device
+#define CMD_BUFFER_SIZE 50
+static UsbCommand cmdBuffer[CMD_BUFFER_SIZE];
+//Points to the next empty position to write to
+static int cmd_head;//Starts as 0
+//Points to the position of the last unread command
+static int cmd_tail;//Starts as 0
+// to lock cmdBuffer operations from different threads
+static pthread_mutex_t cmdBufferMutex = PTHREAD_MUTEX_INITIALIZER;
 
 static command_t CommandTable[] = 
 {
@@ -55,7 +64,6 @@ command_t* getTopLevelCommandTable()
 {
   return CommandTable;
 }
-
 int CmdHelp(const char *Cmd)
 {
   CmdsHelp(CommandTable);
@@ -73,6 +81,113 @@ int CmdRev(const char *Cmd)
   return 0;
 }
 
+/**
+ * @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;
+}
+
+
+/**
+ * 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("Don't forget to cancel its operation first by pressing on the button");
+			break;
+		}
+	}
+	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);
+}
+
+
 //-----------------------------------------------------------------------------
 // Entry point into our code: called whenever the user types a command and
 // then presses Enter, which the full command line that they typed.
@@ -81,3 +196,38 @@ int CommandReceived(char *Cmd) {
 	return CmdsParse(CommandTable, Cmd);
 }
 
+
+//-----------------------------------------------------------------------------
+// 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;
+	}
+
+}
+