FIX: a suggested fix for #136 where the "lf t55x7 read" command when called with...

If PWD Bit is set,  the call will be allowed to execute.
If PWD Bit is NOT set,  the call will print a message and excute the call but without sending the password.
If config block is not being able to read or decode,   the call with print a warning message and exit the call.

diff --git a/client/cmdlft55xx.c b/client/cmdlft55xx.c
index 1cadfe7a6b1cda5ce6f27d75fc4c25c26effe1d7..e652c788589a43173dfd7b16c5bec5e78e5aa21a 100644 (file)
--- a/client/cmdlft55xx.c
+++ b/client/cmdlft55xx.c
@@ -28,6 +28,7 @@
 \r
 #define CONFIGURATION_BLOCK 0x00\r
 #define TRACE_BLOCK 0x01\r
+#define T55x7_PWD      0x00000010\r
 \r
 // Default configuration\r
 t55xx_conf_block_t config = { .modulation = DEMOD_ASK, .inverted = FALSE, .offset = 0x00, .block0 = 0x00};\r
@@ -235,8 +236,20 @@ int CmdT55xxReadBlock(const char *Cmd) {
 \r
        //Password mode\r
        if ( res == 2 ) {\r
-               c.arg[2] = password;\r
-               c.d.asBytes[0] = 0x1; \r
+               \r
+               // try reading the config block and verify that PWD bit is set before doing this!\r
+               AquireData( CONFIGURATION_BLOCK );\r
+               if ( !tryDetectModulation() ) {\r
+                       PrintAndLog("Could not detect is PWD bit is set in config block. Exits.");\r
+                       return 1;\r
+               }\r
+               //if PWD bit is set,  allow to execute read command with password.\r
+               if (( config.block0 & T55x7_PWD ) == 1) {\r
+                       c.arg[2] = password;\r
+                       c.d.asBytes[0] = 0x1;                   \r
+               } else {                \r
+                       PrintAndLog("PWD bit is NOT set in config block. Reading without password...");\r
+               }\r
        }\r
 \r
        clearCommandBuffer();\r