// Code for communicating with the proxmark3 hardware.
//-----------------------------------------------------------------------------
+#include "comms.h"
+
+#include <stdio.h>
+#include <stddef.h>
+#include <string.h>
#include <pthread.h>
+#include <inttypes.h>
+#include <time.h>
-#include "comms.h"
#include "uart.h"
#include "ui.h"
#include "common.h"
-#include "data.h"
+#include "util_darwin.h"
#include "util_posix.h"
-// Declare globals.
// Serial port that we are communicating with the PM3 on.
-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
+} 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];
+#define CMD_BUFFER_SIZE 50
+#define CMD_BUFFER_CHECK_TIME 10 // maximum time (in ms) to wait in getCommand()
+
+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;
+static pthread_cond_t rxBufferSig = PTHREAD_COND_INITIALIZER;
// These wrappers are required because it is not possible to access a static
// global variable outside of the context of a single file.
void SendCommand(UsbCommand *c) {
#ifdef COMMS_DEBUG
- printf("Sending %04x cmd\n", c->cmd);
+ printf("Sending %04" PRIx64 " cmd\n", c->cmd);
#endif
if (offline) {
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);
- txcmd = *c;
- txcmd_pending = true;
+ 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);
+
}
* 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()
-{
+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)
-{
- pthread_mutex_lock(&cmdBufferMutex);
- if( (cmd_head+1) % CMD_BUFFER_SIZE == cmd_tail)
- {
+static void storeCommand(UsbCommand *command) {
+ 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
// 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];
+ 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);
+ cmd_head = (cmd_head + 1) % CMD_BUFFER_SIZE; //increment head and wrap
+ pthread_cond_signal(&rxBufferSig); // tell main thread that a new command can be retreived
+ pthread_mutex_unlock(&rxBufferMutex);
}
/**
* @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
+ * @return 1 if response was returned, 0 if nothing has been received in time
*/
-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);
+static int getCommand(UsbCommand* response, uint32_t ms_timeout) {
+
+ struct timespec end_time;
+ clock_gettime(CLOCK_REALTIME, &end_time);
+ end_time.tv_sec += ms_timeout / 1000;
+ end_time.tv_nsec += (ms_timeout % 1000) * 1000000;
+ if (end_time.tv_nsec > 1000000000) {
+ end_time.tv_nsec -= 1000000000;
+ end_time.tv_sec += 1;
+ }
+ pthread_mutex_lock(&rxBufferMutex);
+ int res = 0;
+ while (cmd_head == cmd_tail && !res) {
+ res = pthread_cond_timedwait(&rxBufferSig, &rxBufferMutex, &end_time);
+ }
+ if (res) { // timeout
+ pthread_mutex_unlock(&rxBufferMutex);
return 0;
}
- //Pick out the next unread command
- UsbCommand* last_unread = &cmdBuffer[cmd_tail];
+ // Pick out the next unread command
+ UsbCommand* last_unread = &rxBuffer[cmd_tail];
memcpy(response, last_unread, sizeof(UsbCommand));
- //Increment tail - this is a circular buffer, so modulo buffer size
+ // 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;
}
-//-----------------------------------------------------------------------------
-// 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) {
+//----------------------------------------------------------------------------------
+// Entry point into our code: called whenever we received a packet over USB.
+// Handle debug commands directly, store all other commands in circular buffer.
+//----------------------------------------------------------------------------------
+static 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);
+ size_t len = MIN(UC->arg[0], USB_CMD_DATA_SIZE);
+ memcpy(s, UC->d.asBytes,len);
PrintAndLog("#db# %s", s);
return;
} break;
return;
} break;
- case CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K: {
- // FIXME: This does unsanitised copies into memory when we don't know
- // the size of the buffer.
- memcpy(sample_buf+(UC->arg[0]),UC->d.asBytes,UC->arg[1]);
- return;
- } break;
-
default:
storeCommand(UC);
break;
}
-void
+static bool receive_from_serial(serial_port sp, uint8_t *rx_buf, size_t len, size_t *received_len) {
+ size_t bytes_read = 0;
+ *received_len = 0;
+ // we eventually need to call uart_receive several times because it may timeout in the middle of a transfer
+ while (uart_receive(sp, rx_buf + *received_len, len - *received_len, &bytes_read) && bytes_read && *received_len < len) {
+ #ifdef COMMS_DEBUG
+ if (bytes_read != len - *received_len) {
+ printf("uart_receive() returned true but not enough bytes could be received. received: %zd, wanted to receive: %zd, already received before: %zd\n",
+ bytes_read, len - *received_len, *received_len);
+ }
+ #endif
+ *received_len += bytes_read;
+ bytes_read = 0;
+ }
+ return (*received_len == len);
+}
+
+
+static void
#ifdef __has_attribute
#if __has_attribute(force_align_arg_pointer)
-__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;
+*uart_communication(void *targ) {
+ communication_arg_t *conn = (communication_arg_t*)targ;
uint8_t rx[sizeof(UsbCommand)];
+ size_t rxlen = 0;
uint8_t *prx = rx;
+ UsbCommand *command = (UsbCommand*)rx;
+ UsbResponse *response = (UsbResponse*)rx;
+
+#if defined(__MACH__) && defined(__APPLE__)
+ disableAppNap("Proxmark3 polling UART");
+#endif
- while (arg->run) {
- rxlen = 0;
- if (uart_receive(sp, prx, sizeof(UsbCommand) - (prx-rx), &rxlen) && rxlen) {
+ while (conn->run) {
+ bool ACK_received = false;
+ prx = rx;
+ size_t bytes_to_read = offsetof(UsbResponse, d); // the fixed part of a new style UsbResponse. Otherwise this will be cmd and arg[0] (64 bit each)
+ if (receive_from_serial(sp, prx, bytes_to_read, &rxlen)) {
prx += rxlen;
- if (prx-rx < sizeof(UsbCommand)) {
- continue;
+ if (response->cmd & CMD_VARIABLE_SIZE_FLAG) { // new style response with variable size
+#ifdef COMMS_DEBUG
+ PrintAndLog("received new style response %04" PRIx16 ", datalen = %zd, arg[0] = %08" PRIx32 ", arg[1] = %08" PRIx32 ", arg[2] = %08" PRIx32,
+ response->cmd, response->datalen, response->arg[0], response->arg[1], response->arg[2]);
+#endif
+ bytes_to_read = response->datalen;
+ if (receive_from_serial(sp, prx, bytes_to_read, &rxlen)) {
+ UsbCommand resp;
+ resp.cmd = response->cmd & ~CMD_VARIABLE_SIZE_FLAG; // remove the flag
+ resp.arg[0] = response->arg[0];
+ resp.arg[1] = response->arg[1];
+ resp.arg[2] = response->arg[2];
+ memcpy(&resp.d.asBytes, &response->d.asBytes, response->datalen);
+ UsbCommandReceived(&resp);
+ if (resp.cmd == CMD_ACK) {
+ ACK_received = true;
+ }
+ }
+ } else { // old style response uses same data structure as commands. Fixed size.
+#ifdef COMMS_DEBUG
+ PrintAndLog("received old style response %016" PRIx64 ", arg[0] = %016" PRIx64, command->cmd, command->arg[0]);
+#endif
+ bytes_to_read = sizeof(UsbCommand) - bytes_to_read;
+ if (receive_from_serial(sp, prx, bytes_to_read, &rxlen)) {
+ UsbCommandReceived(command);
+ if (command->cmd == CMD_ACK) {
+ ACK_received = true;
+ }
+ }
}
- UsbCommandReceived((UsbCommand*)rx);
}
- prx = rx;
- if(txcmd_pending) {
- if (!uart_send(sp, (uint8_t*) &txcmd, sizeof(UsbCommand))) {
+ pthread_mutex_lock(&txBufferMutex);
+ // if we received an ACK the PM has done its job and waits for another command.
+ // We therefore can wait here as well until a new command is to be transmitted.
+ // The advantage is that the next command will be transmitted immediately without the need to wait for a receive timeout
+ 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);
}
+#if defined(__MACH__) && defined(__APPLE__)
+ enableAppNap();
+#endif
+
pthread_exit(NULL);
return NULL;
}
+/**
+ * Data transfer from Proxmark to client. This method times out after
+ * ms_timeout milliseconds.
+ * @brief GetFromBigBuf
+ * @param dest Destination address for transfer
+ * @param bytes number of bytes to be transferred
+ * @param start_index offset into Proxmark3 BigBuf[]
+ * @param response struct to copy last command (CMD_ACK) into
+ * @param ms_timeout timeout in milliseconds
+ * @param show_warning display message after 2 seconds
+ * @return true if command was returned, otherwise false
+ */
+bool GetFromBigBuf(uint8_t *dest, int bytes, int start_index, UsbCommand *response, size_t ms_timeout, bool show_warning) {
+
+ uint64_t start_time = msclock();
+
+ UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {start_index, bytes, 0}};
+ SendCommand(&c);
+
+ UsbCommand resp;
+ if (response == NULL) {
+ response = &resp;
+ }
+
+ int bytes_completed = 0;
+ while (true) {
+ if (msclock() - start_time > ms_timeout) {
+ break; // timeout
+ }
+ if (msclock() - start_time > 2000 && show_warning) {
+ // 2 seconds elapsed (but this doesn't mean the timeout was exceeded)
+ PrintAndLog("Waiting for a response from the proxmark...");
+ PrintAndLog("You can cancel this operation by pressing the pm3 button");
+ show_warning = false;
+ }
+ if (getCommand(response, CMD_BUFFER_CHECK_TIME)) {
+ if (response->cmd == CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K) {
+ int copy_bytes = MIN(bytes - bytes_completed, response->arg[1]);
+ memcpy(dest + response->arg[0], response->d.asBytes, copy_bytes);
+ bytes_completed += copy_bytes;
+ } else if (response->cmd == CMD_ACK) {
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
+
+bool GetFromFpgaRAM(uint8_t *dest, int bytes) {
+
+ uint64_t start_time = msclock();
+
+ UsbCommand c = {CMD_HF_PLOT, {0, 0, 0}};
+ SendCommand(&c);
+
+ UsbCommand response;
+
+ int bytes_completed = 0;
+ bool show_warning = true;
+ while (true) {
+ 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;
+ }
+ if (getCommand(&response, CMD_BUFFER_CHECK_TIME)) {
+ if (response.cmd == CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K) {
+ int copy_bytes = MIN(bytes - bytes_completed, response.arg[1]);
+ memcpy(dest + response.arg[0], response.d.asBytes, copy_bytes);
+ bytes_completed += copy_bytes;
+ } else if (response.cmd == CMD_ACK) {
+ return true;
+ }
+ }
+ }
+
+ return false;
+}
+
+
+bool OpenProxmark(void *port, bool wait_for_port, int timeout) {
+ 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;
+ pthread_create(&USB_communication_thread, NULL, &uart_communication, &conn);
+ return true;
+ }
+}
+
+
+void CloseProxmark(void) {
+ conn.run = false;
+
+#ifdef __BIONIC__
+ // In Android O and later, if an invalid pthread_t is passed to pthread_join, it calls fatal().
+ // https://github.com/aosp-mirror/platform_bionic/blob/ed16b344e75f422fb36fbfd91fb30de339475880/libc/bionic/pthread_internal.cpp#L116-L128
+ //
+ // In Bionic libc, pthread_t is an integer.
+
+ if (USB_communication_thread != 0) {
+ pthread_join(USB_communication_thread, NULL);
+ }
+#else
+ // pthread_t is a struct on other libc, treat as an opaque memory reference
+ pthread_join(USB_communication_thread, NULL);
+#endif
+
+ if (sp) {
+ uart_close(sp);
+ }
+
+ // Clean up our state
+ sp = NULL;
+ serial_port_name = NULL;
+#ifdef __BIONIC__
+ memset(&USB_communication_thread, 0, sizeof(pthread_t));
+#endif
+}
+
+
/**
* Waits for a certain response type. This method waits for a maximum of
* ms_timeout milliseconds for a specified response command.
* @param cmd command to wait for, or CMD_UNKNOWN to take any command.
* @param response struct to copy received command into.
* @param ms_timeout
- * @param show_warning
+ * @param show_warning display message after 2 seconds
* @return true if command was returned, otherwise false
*/
bool WaitForResponseTimeoutW(uint32_t cmd, UsbCommand* response, size_t ms_timeout, bool show_warning) {
printf("Waiting for %04x cmd\n", cmd);
#endif
+ uint64_t start_time = msclock();
+
if (response == NULL) {
response = &resp;
}
- uint64_t start_time = msclock();
-
// Wait until the command is received
while (true) {
- while(getCommand(response)) {
- if (cmd == CMD_UNKNOWN || response->cmd == cmd) {
- return true;
- }
- }
-
- if (msclock() - start_time > ms_timeout) {
- break;
+ if (ms_timeout != -1 && msclock() > start_time + ms_timeout) {
+ break; // timeout
}
-
if (msclock() - start_time > 2000 && show_warning) {
// 2 seconds elapsed (but this doesn't mean the timeout was exceeded)
PrintAndLog("Waiting for a response from the proxmark...");
PrintAndLog("You can cancel this operation by pressing the pm3 button");
show_warning = false;
}
+ if (getCommand(response, CMD_BUFFER_CHECK_TIME)) {
+ if (cmd == CMD_UNKNOWN || response->cmd == cmd) {
+ return true;
+ }
+ }
}
return false;
}
projects / proxmark3-svn / blobdiff