// Code for communicating with the proxmark3 hardware.
//-----------------------------------------------------------------------------
-#include <pthread.h>
-
#include "comms.h"
+
+#include <pthread.h>
+#if defined(__linux__) && !defined(NO_UNLINK)
+#include <unistd.h> // for unlink()
+#endif
#include "uart.h"
#include "ui.h"
#include "common.h"
#include "util_posix.h"
-// Declare globals.
// Serial port that we are communicating with the PM3 on.
-static serial_port sp;
+static serial_port sp = NULL;
+static char *serial_port_name = NULL;
// If TRUE, then there is no active connection to the PM3, and we will drop commands sent.
static bool offline;
+typedef struct {
+ bool run; // If TRUE, continue running the uart_communication thread
+ bool block_after_ACK; // if true, block after receiving an ACK package
+} communication_arg_t;
+
+static communication_arg_t conn;
+static pthread_t USB_communication_thread;
+
// 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;
+static UsbCommand txBuffer;
+static bool txBuffer_pending = false;
+static pthread_mutex_t txBufferMutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t txBufferSig = PTHREAD_COND_INITIALIZER;
// 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];
+static UsbCommand rxBuffer[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;
+// to lock rxBuffer operations from different threads
+static pthread_mutex_t rxBufferMutex = PTHREAD_MUTEX_INITIALIZER;
// These wrappers are required because it is not possible to access a static
// global variable outside of the context of a single file.
return offline;
}
-bool OpenProxmark(char *portname, bool waitCOMPort, int timeout) {
- if (!waitCOMPort) {
- sp = uart_open(portname);
- } else {
- printf("Waiting for Proxmark to appear on %s ", portname);
- fflush(stdout);
- int openCount = 0;
- do {
- sp = uart_open(portname);
- msleep(1000);
- printf(".");
- fflush(stdout);
- } while(++openCount < timeout && (sp == INVALID_SERIAL_PORT || sp == CLAIMED_SERIAL_PORT));
- printf("\n");
- }
-
- // check result of uart opening
- if (sp == INVALID_SERIAL_PORT) {
- printf("ERROR: invalid serial port\n");
- return false;
- } else if (sp == CLAIMED_SERIAL_PORT) {
- printf("ERROR: serial port is claimed by another process\n");
- return false;
- } else {
- return true;
- }
-}
-
-void CloseProxmark(void) {
- uart_close(sp);
-}
-
void SendCommand(UsbCommand *c) {
#ifdef COMMS_DEBUG
printf("Sending %04x cmd\n", c->cmd);
PrintAndLog("Sending bytes to proxmark failed - offline");
return;
}
+
+ pthread_mutex_lock(&txBufferMutex);
/**
- 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
+ This 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);
+ while (txBuffer_pending) {
+ pthread_cond_wait(&txBufferSig, &txBufferMutex); // wait for communication thread to complete sending a previous commmand
+ }
+
+ txBuffer = *c;
+ txBuffer_pending = true;
+ pthread_cond_signal(&txBufferSig); // tell communication thread that a new command can be send
+
+ pthread_mutex_unlock(&txBufferMutex);
- txcmd = *c;
- txcmd_pending = true;
}
void clearCommandBuffer()
{
//This is a very simple operation
- pthread_mutex_lock(&cmdBufferMutex);
+ pthread_mutex_lock(&rxBufferMutex);
cmd_tail = cmd_head;
- pthread_mutex_unlock(&cmdBufferMutex);
+ pthread_mutex_unlock(&rxBufferMutex);
}
/**
* @brief storeCommand stores a USB command in a circular buffer
* @param UC
*/
-void storeCommand(UsbCommand *command)
+static void storeCommand(UsbCommand *command)
{
- pthread_mutex_lock(&cmdBufferMutex);
+ pthread_mutex_lock(&rxBufferMutex);
if( (cmd_head+1) % CMD_BUFFER_SIZE == cmd_tail)
{
// If these two are equal, we're about to overwrite in the
}
// Store the command at the 'head' location
- UsbCommand* destination = &cmdBuffer[cmd_head];
+ UsbCommand* destination = &rxBuffer[cmd_head];
memcpy(destination, command, sizeof(UsbCommand));
cmd_head = (cmd_head +1) % CMD_BUFFER_SIZE; //increment head and wrap
- pthread_mutex_unlock(&cmdBufferMutex);
+ pthread_mutex_unlock(&rxBufferMutex);
}
* @param response location to write command
* @return 1 if response was returned, 0 if nothing has been received
*/
-int getCommand(UsbCommand* response)
+static int getCommand(UsbCommand* response)
{
- pthread_mutex_lock(&cmdBufferMutex);
+ pthread_mutex_lock(&rxBufferMutex);
//If head == tail, there's nothing to read, or if we just got initialized
if (cmd_head == cmd_tail){
- pthread_mutex_unlock(&cmdBufferMutex);
+ pthread_mutex_unlock(&rxBufferMutex);
return 0;
}
//Pick out the next unread command
- UsbCommand* last_unread = &cmdBuffer[cmd_tail];
+ UsbCommand* last_unread = &rxBuffer[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);
+ pthread_mutex_unlock(&rxBufferMutex);
return 1;
}
}
-void
+static void
#ifdef __has_attribute
#if __has_attribute(force_align_arg_pointer)
__attribute__((force_align_arg_pointer))
#endif
#endif
-*uart_receiver(void *targ) {
- receiver_arg *conn = (receiver_arg*)targ;
+*uart_communication(void *targ) {
+ communication_arg_t *conn = (communication_arg_t*)targ;
size_t rxlen;
- uint8_t rx[sizeof(UsbCommand)];
- uint8_t *prx = rx;
+ UsbCommand rx;
+ UsbCommand *prx = ℞
while (conn->run) {
rxlen = 0;
- if (uart_receive(sp, prx, sizeof(UsbCommand) - (prx-rx), &rxlen) && rxlen) {
+ bool ACK_received = false;
+ if (uart_receive(sp, (uint8_t *)prx, sizeof(UsbCommand) - (prx-&rx), &rxlen) && rxlen) {
prx += rxlen;
- if (prx-rx < sizeof(UsbCommand)) {
+ if (prx-&rx < sizeof(UsbCommand)) {
continue;
}
- UsbCommandReceived((UsbCommand*)rx);
+ UsbCommandReceived(&rx);
+ if (rx.cmd == CMD_ACK) {
+ ACK_received = true;
+ }
}
- prx = rx;
+ prx = ℞
- if(txcmd_pending) {
- if (!uart_send(sp, (uint8_t*) &txcmd, sizeof(UsbCommand))) {
+
+ pthread_mutex_lock(&txBufferMutex);
+
+ if (conn->block_after_ACK) {
+ // if we just received an ACK, wait here until a new command is to be transmitted
+ if (ACK_received) {
+ while (!txBuffer_pending) {
+ pthread_cond_wait(&txBufferSig, &txBufferMutex);
+ }
+ }
+ }
+
+ if(txBuffer_pending) {
+ if (!uart_send(sp, (uint8_t*) &txBuffer, sizeof(UsbCommand))) {
PrintAndLog("Sending bytes to proxmark failed");
}
- txcmd_pending = false;
+ txBuffer_pending = false;
+ pthread_cond_signal(&txBufferSig); // tell main thread that txBuffer is empty
}
+
+ pthread_mutex_unlock(&txBufferMutex);
}
pthread_exit(NULL);
}
-
/**
* Data transfer from Proxmark to client. This method times out after
* ms_timeout milliseconds.
return false;
}
+
+bool OpenProxmark(void *port, bool wait_for_port, int timeout, bool flash_mode) {
+ char *portname = (char *)port;
+ if (!wait_for_port) {
+ sp = uart_open(portname);
+ } else {
+ printf("Waiting for Proxmark to appear on %s ", portname);
+ fflush(stdout);
+ int openCount = 0;
+ do {
+ sp = uart_open(portname);
+ msleep(1000);
+ printf(".");
+ fflush(stdout);
+ } while(++openCount < timeout && (sp == INVALID_SERIAL_PORT || sp == CLAIMED_SERIAL_PORT));
+ printf("\n");
+ }
+
+ // check result of uart opening
+ if (sp == INVALID_SERIAL_PORT) {
+ printf("ERROR: invalid serial port\n");
+ sp = NULL;
+ serial_port_name = NULL;
+ return false;
+ } else if (sp == CLAIMED_SERIAL_PORT) {
+ printf("ERROR: serial port is claimed by another process\n");
+ sp = NULL;
+ serial_port_name = NULL;
+ return false;
+ } else {
+ // start the USB communication thread
+ serial_port_name = portname;
+ conn.run = true;
+ conn.block_after_ACK = flash_mode;
+ pthread_create(&USB_communication_thread, NULL, &uart_communication, &conn);
+ return true;
+ }
+}
+
+
+void CloseProxmark(void) {
+ conn.run = false;
+ pthread_join(USB_communication_thread, NULL);
+
+ if (sp) {
+ uart_close(sp);
+ }
+
+#if defined(__linux__) && !defined(NO_UNLINK)
+ // Fix for linux, it seems that it is extremely slow to release the serial port file descriptor /dev/*
+ //
+ // This may be disabled at compile-time with -DNO_UNLINK (used for a JNI-based serial port on Android).
+ if (serial_port_name) {
+ unlink(serial_port_name);
+ }
+#endif
+
+ // Clean up our state
+ sp = NULL;
+ serial_port_name = NULL;
+}
+
/**
* Waits for a certain response type. This method waits for a maximum of
projects / proxmark3-svn / blobdiff