Merge pull request #969 from pwpiwi/gcc10_fixes

[proxmark3-svn] / client / comms.c

diff --git a/client/comms.c b/client/comms.c
index 2030f8f3ea6010946bbc990aa1dcbc805c9bbbfd..1391641d569ce9a3183933378e3983c3268ba657 100644 (file)
--- a/client/comms.c
+++ b/client/comms.c
@@ -9,15 +9,22 @@
 // Code for communicating with the proxmark3 hardware.
 //-----------------------------------------------------------------------------
 
 // Code for communicating with the proxmark3 hardware.
 //-----------------------------------------------------------------------------
 

+#define _POSIX_C_SOURCE 199309L // need clock_gettime()
+

 #include "comms.h"
 
 #include "comms.h"
 

+#include <stdio.h>
+#include <stddef.h>
+#include <string.h>

 #include <pthread.h>
 #include <pthread.h>

-#if defined(__linux__) && !defined(NO_UNLINK)
-#include <unistd.h>            // for unlink()
-#endif
+#include <inttypes.h>
+#include <time.h>
+#include <sys/time.h>
+

 #include "uart.h"
 #include "ui.h"
 #include "common.h"
 #include "uart.h"
 #include "ui.h"
 #include "common.h"

+#include "util_darwin.h"

 #include "util_posix.h"
 
 
 #include "util_posix.h"
 
 


@@ -30,7 +37,6 @@ static bool offline;
 
 typedef struct {
        bool run; // If TRUE, continue running the uart_communication thread
 
 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;
 } communication_arg_t;
 
 static communication_arg_t conn;


@@ -44,6 +50,9 @@ 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})
 
 // Used by UsbReceiveCommand as a ring buffer for messages that are yet to be
 // processed by a command handler (WaitForResponse{,Timeout})

+#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 UsbCommand rxBuffer[CMD_BUFFER_SIZE];
 
 // Points to the next empty position to write to


@@ -54,6 +63,7 @@ static int cmd_tail = 0;
 
 // to lock rxBuffer operations from different threads
 static pthread_mutex_t rxBufferMutex = 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.
 
 // These wrappers are required because it is not possible to access a static
 // global variable outside of the context of a single file.


@@ -68,17 +78,17 @@ bool IsOffline() {
 
 void SendCommand(UsbCommand *c) {
        #ifdef COMMS_DEBUG
 
 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;
        #endif
 
        if (offline) {
                PrintAndLog("Sending bytes to proxmark failed - offline");
                return;

-    }
+       }

 
        pthread_mutex_lock(&txBufferMutex);
        /**
 
        pthread_mutex_lock(&txBufferMutex);
        /**

-       This causes hangups at times, when the pm3 unit is unresponsive or disconnected. The main console thread is alive, 
+       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 (txBuffer_pending) {
        but comm thread just spins here. Not good.../holiman
        **/
        while (txBuffer_pending) {


@@ -100,8 +110,7 @@ void SendCommand(UsbCommand *c) {
  *  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.
  */
  *  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(&rxBufferMutex);
        cmd_tail = cmd_head;
        //This is a very simple operation
        pthread_mutex_lock(&rxBufferMutex);
        cmd_tail = cmd_head;


@@ -112,11 +121,9 @@ void clearCommandBuffer()
  * @brief storeCommand stores a USB command in a circular buffer
  * @param UC
  */
  * @brief storeCommand stores a USB command in a circular buffer
  * @param UC
  */

-static void storeCommand(UsbCommand *command)
-{
+static void storeCommand(UsbCommand *command) {

        pthread_mutex_lock(&rxBufferMutex);
        pthread_mutex_lock(&rxBufferMutex);

-       if( (cmd_head+1) % CMD_BUFFER_SIZE == cmd_tail)
-       {
+       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!");
                // 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!");


@@ -126,7 +133,8 @@ static void storeCommand(UsbCommand *command)
        UsbCommand* destination = &rxBuffer[cmd_head];
        memcpy(destination, command, sizeof(UsbCommand));
 
        UsbCommand* destination = &rxBuffer[cmd_head];
        memcpy(destination, command, sizeof(UsbCommand));
 

-       cmd_head = (cmd_head +1) % CMD_BUFFER_SIZE; //increment head and wrap
+       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);
 }
 
        pthread_mutex_unlock(&rxBufferMutex);
 }
 


@@ -134,21 +142,32 @@ static void storeCommand(UsbCommand *command)
 /**
  * @brief getCommand gets a command from an internal circular buffer.
  * @param response location to write command
 /**
  * @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

  */
  */

-static int getCommand(UsbCommand* response)
-{
+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);
        pthread_mutex_lock(&rxBufferMutex);

-       //If head == tail, there's nothing to read, or if we just got initialized
-       if (cmd_head == cmd_tail){
+       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;
        }
 
                pthread_mutex_unlock(&rxBufferMutex);
                return 0;
        }
 

-       //Pick out the next unread command
+       // Pick out the next unread command

        UsbCommand* last_unread = &rxBuffer[cmd_tail];
        memcpy(response, last_unread, sizeof(UsbCommand));
        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(&rxBufferMutex);
        cmd_tail = (cmd_tail + 1) % CMD_BUFFER_SIZE;
 
        pthread_mutex_unlock(&rxBufferMutex);


@@ -160,15 +179,14 @@ static int getCommand(UsbCommand* response)
 // Entry point into our code: called whenever we received a packet over USB.
 // Handle debug commands directly, store all other commands in circular buffer.
 //----------------------------------------------------------------------------------
 // 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) {
+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));
                // 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;
                        PrintAndLog("#db# %s", s);
                        return;
                } break;


@@ -179,63 +197,110 @@ static void UsbCommandReceived(UsbCommand *UC)
                } break;
 
                default:
                } break;
 
                default:

-                       storeCommand(UC);
+                       storeCommand(UC);

                        break;
        }
 
 }
 
 
                        break;
        }
 
 }
 
 

+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)
 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_communication(void *targ) {
        communication_arg_t *conn = (communication_arg_t*)targ;
 #endif
 #endif
 *uart_communication(void *targ) {
        communication_arg_t *conn = (communication_arg_t*)targ;

-       size_t rxlen;
-       UsbCommand rx;
-       UsbCommand *prx = &rx;
+       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 (conn->run) {
 
        while (conn->run) {

-               rxlen = 0;

                bool ACK_received = false;
                bool ACK_received = false;

-               if (uart_receive(sp, (uint8_t *)prx, sizeof(UsbCommand) - (prx-&rx), &rxlen) && rxlen) {
+               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;
                        prx += rxlen;

-                       if (prx-&rx < sizeof(UsbCommand)) {
-                               continue;
-                       }
-                       UsbCommandReceived(&rx);
-                       if (rx.cmd == CMD_ACK) {
-                               ACK_received = true;
+                       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;
+                                       }
+                               }

                        }
                }
                        }
                }

-               prx = &rx;

 
 

-               

                pthread_mutex_lock(&txBufferMutex);
                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 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 (txBuffer_pending) {

                        if (!uart_send(sp, (uint8_t*) &txBuffer, sizeof(UsbCommand))) {
                                PrintAndLog("Sending bytes to proxmark failed");
                        }
                        txBuffer_pending = false;
                        if (!uart_send(sp, (uint8_t*) &txBuffer, sizeof(UsbCommand))) {
                                PrintAndLog("Sending bytes to proxmark failed");
                        }
                        txBuffer_pending = false;

-                       pthread_cond_signal(&txBufferSig); // tell main thread that txBuffer is empty

                }
                }

-
+               pthread_cond_signal(&txBufferSig); // tell main thread that txBuffer is empty

                pthread_mutex_unlock(&txBufferMutex);
        }
 
                pthread_mutex_unlock(&txBufferMutex);
        }
 

+#if defined(__MACH__) && defined(__APPLE__)
+       enableAppNap();
+#endif
+

        pthread_exit(NULL);
        return NULL;
 }
        pthread_exit(NULL);
        return NULL;
 }


@@ -253,21 +318,30 @@ __attribute__((force_align_arg_pointer))
  * @param show_warning display message after 2 seconds
  * @return true if command was returned, otherwise false
  */
  * @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)
-{
-       UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {start_index, bytes, 0}};
-       SendCommand(&c);
+bool GetFromBigBuf(uint8_t *dest, int bytes, int start_index, UsbCommand *response, size_t ms_timeout, bool show_warning) {

 
        uint64_t start_time = msclock();
 
 
        uint64_t start_time = msclock();
 

+       UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {start_index, bytes, 0}};
+       SendCommand(&c);
+

        UsbCommand resp;
        UsbCommand resp;

-       if (response == NULL) {
+       if (response == NULL) {

                response = &resp;
        }
 
        int bytes_completed = 0;
                response = &resp;
        }
 
        int bytes_completed = 0;

-       while(true) {
-               if (getCommand(response)) {
+       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);
                        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);


@@ -276,23 +350,45 @@ bool GetFromBigBuf(uint8_t *dest, int bytes, int start_index, UsbCommand *respon
                                return true;
                        }
                }
                                return true;
                        }
                }

+       }

 
 

-               if (msclock() - start_time > ms_timeout) {
-                       break;
-               }
+       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 (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;
 }
 
        }
 
        return false;
 }
 

-       
-bool OpenProxmark(void *port, bool wait_for_port, int timeout, bool flash_mode) {
+
+bool OpenProxmark(void *port, bool wait_for_port, int timeout) {

        char *portname = (char *)port;
        if (!wait_for_port) {
                sp = uart_open(portname);
        char *portname = (char *)port;
        if (!wait_for_port) {
                sp = uart_open(portname);


@@ -305,7 +401,7 @@ bool OpenProxmark(void *port, bool wait_for_port, int timeout, bool flash_mode)
                        msleep(1000);
                        printf(".");
                        fflush(stdout);
                        msleep(1000);
                        printf(".");
                        fflush(stdout);

-               } while(++openCount < timeout && (sp == INVALID_SERIAL_PORT || sp == CLAIMED_SERIAL_PORT));
+               } while (++openCount < timeout && (sp == INVALID_SERIAL_PORT || sp == CLAIMED_SERIAL_PORT));

                printf("\n");
        }
 
                printf("\n");
        }
 


@@ -324,7 +420,6 @@ bool OpenProxmark(void *port, bool wait_for_port, int timeout, bool flash_mode)
                // start the USB communication thread
                serial_port_name = portname;
                conn.run = true;
                // 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;
        }
                pthread_create(&USB_communication_thread, NULL, &uart_communication, &conn);
                return true;
        }


@@ -333,24 +428,31 @@ bool OpenProxmark(void *port, bool wait_for_port, int timeout, bool flash_mode)
 
 void CloseProxmark(void) {
        conn.run = false;
 
 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);
        pthread_join(USB_communication_thread, NULL);

+#endif

 
        if (sp) {
                uart_close(sp);
        }
 
 
        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;
        // Clean up our state
        sp = NULL;
        serial_port_name = NULL;

+#ifdef __BIONIC__
+       memset(&USB_communication_thread, 0, sizeof(pthread_t));
+#endif

 }
 
 
 }
 
 


@@ -372,30 +474,28 @@ bool WaitForResponseTimeoutW(uint32_t cmd, UsbCommand* response, size_t ms_timeo
        printf("Waiting for %04x cmd\n", cmd);
        #endif
 
        printf("Waiting for %04x cmd\n", cmd);
        #endif
 

+       uint64_t start_time = msclock();
+

        if (response == NULL) {
                response = &resp;
        }
 
        if (response == NULL) {
                response = &resp;
        }
 

-       uint64_t start_time = msclock();
-

        // Wait until the command is received
        while (true) {
        // 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 (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;
 }
        }
        return false;
 }