Proxmark developers community

ryan

Member

Registered: 2009-06-17

Posts: 36

Linux Client in OSX - Some Success

So after changing the pm3's USB descriptor to not be a HID device I was able to successfully prevent OSX from grabbing it so that libusb can talk to the pm3 without having to run the detach command.  I know doing this creates other issues, so I'm only doing it temporarily until a solution is decided upon.

The proxmark3 client can see the pm3, but it hangs when a command is entered because usb_bulk_read in the reader pthread does not appear to honor the timeout value and hangs indefinitely.  If you then do something to get the device to transmit data (like unplug it and plug it back in, or enter standalone mode) it does receive the data.

Can anybody else try to replicate this?  Any ideas for a workaround?

ryan

Member

Registered: 2009-06-17

Posts: 36

Re: Linux Client in OSX - Some Success

After playing with it a bit more, I ended up compiling libusb myself rather than installing the one from darwinports, and it works.  So if anyone runs into this problem and is using darwinports, try compiling libusb from scratch.

Next step will be to test qtgui support.

bushing

Member

Registered: 2008-10-14

Posts: 42

Re: Linux Client in OSX - Some Success

It should be possible to create a "codeless kext" that prevents com.apple.iokit.IOUSBHIDDriver from grabbing the Proxmark3 ... but I tried, and couldn't get it to work.   I'll try to modify the USB descriptor like you describe...

bushing

Member

Registered: 2008-10-14

Posts: 42

Re: Linux Client in OSX - Some Success

Okay, I made some more progress.  Something is really wrong with the event handling -- I can't really figure out how this code can work under Linux.  This patch made it start running:

Index: proxmark3.c
===================================================================
--- proxmark3.c  (revision 252)
+++ proxmark3.c  (working copy)
@@ -46,21 +46,24 @@
 {
   struct main_loop_arg *arg = (struct main_loop_arg*)targ;
   char *cmd = NULL;
+  pthread_t reader_thread;
 
-  while(1) {
+  if (arg->usb_present == 1) {
     struct usb_receiver_arg rarg;
-    pthread_t reader_thread;
+    rarg.run=1;
+    printf("******* spawning reader thread\n");
+    pthread_create(&reader_thread, NULL, &usb_receiver, &rarg);
+  }
 
-    rarg.run=1;
-    if (arg->usb_present == 1) {
-      pthread_create(&reader_thread, NULL, &usb_receiver, &rarg);
-    }
+  while(1) {
+
     cmd = readline(PROXPROMPT);
-    rarg.run=0;
-    if (arg->usb_present == 1) {
-      pthread_join(reader_thread, NULL);
-    }
-
+    printf("cmd = %s\n", cmd);
+//    rarg.run=0;
+//    if (arg->usb_present == 1) {
+//      printf("******* joining reader thread\n");
+//      pthread_join(reader_thread, NULL);
+//    }
     if (cmd) {
       if (cmd[0] != 0x00) {
         CommandReceived(cmd);

Why was the reader thread constantly being created and torn down?