Fix memory bounds error

[proxmark3-svn] / client / cmdmain.c

diff --git a/client/cmdmain.c b/client/cmdmain.c
index 843f9301dc0b554e39f5327ededdf5729e3f67f7..739d68e1cbc0beb609f0d858dae78a3ad1438b95 100644 (file)
--- a/client/cmdmain.c
+++ b/client/cmdmain.c
@@ -8,11 +8,13 @@
 // Main command parser entry point
 //-----------------------------------------------------------------------------
 
+#include "cmdmain.h"
+
+#include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
-#include "sleep.h"
 #include "cmdparser.h"
 #include "proxmark3.h"
 #include "data.h"
@@ -22,8 +24,8 @@
 #include "cmddata.h"
 #include "cmdhw.h"
 #include "cmdlf.h"
-#include "cmdmain.h"
 #include "util.h"
+#include "util_posix.h"
 #include "cmdscript.h"
 #include "cmdcrc.h"
 
@@ -41,6 +43,8 @@ static UsbCommand cmdBuffer[CMD_BUFFER_SIZE];
 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[] = 
 {
@@ -86,7 +90,9 @@ int CmdRev(const char *Cmd)
 void clearCommandBuffer()
 {
     //This is a very simple operation
+       pthread_mutex_lock(&cmdBufferMutex);
     cmd_tail = cmd_head;
+       pthread_mutex_unlock(&cmdBufferMutex);
 }
 
 /**
@@ -95,6 +101,7 @@ void clearCommandBuffer()
  */
 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
@@ -106,6 +113,7 @@ void storeCommand(UsbCommand *command)
     memcpy(destination, command, sizeof(UsbCommand));
 
     cmd_head = (cmd_head +1) % CMD_BUFFER_SIZE; //increment head and wrap
+       pthread_mutex_unlock(&cmdBufferMutex);
 }
 
 
@@ -116,8 +124,10 @@ void storeCommand(UsbCommand *command)
  */
 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
@@ -125,7 +135,7 @@ int getCommand(UsbCommand* response)
     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;
 }
 
@@ -139,7 +149,7 @@ int getCommand(UsbCommand* response)
  * @param ms_timeout
  * @return true if command was returned, otherwise false
  */
-bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeout) {
+bool WaitForResponseTimeoutW(uint32_t cmd, UsbCommand* response, size_t ms_timeout, bool show_warning) {
   
        UsbCommand resp;
        
@@ -147,25 +157,34 @@ bool WaitForResponseTimeout(uint32_t cmd, UsbCommand* response, size_t ms_timeou
                response = &resp;
        }
 
+       uint64_t start_time = msclock();
+       
        // Wait until the command is received
-       for(size_t dm_seconds=0; dm_seconds < ms_timeout/10; dm_seconds++) {
+       while (true) {
                while(getCommand(response)) {
                        if(response->cmd == cmd){
                                return true;
                        }
                }
-               msleep(10); // XXX ugh
-               if (dm_seconds == 200) { // Two seconds elapsed
+               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 WaitForResponseTimeout(cmd,response,-1);
+       return WaitForResponseTimeoutW(cmd, response, -1, true);
 }