From 241f6080cc72d3f4f19c0414338aa3c6943bcfbf Mon Sep 17 00:00:00 2001
From: cslashm <cslashm@gmail.com>
Date: Thu, 7 Mar 2019 23:34:53 +0100
Subject: [PATCH] Add application version compatibility check.

---
 src/device/device_ledger.cpp | 12 +++++++++++-
 src/device/device_ledger.hpp | 12 ++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/device/device_ledger.cpp b/src/device/device_ledger.cpp
index 8ead665a7..8f6cdd25f 100644
--- a/src/device/device_ledger.cpp
+++ b/src/device/device_ledger.cpp
@@ -303,7 +303,17 @@ namespace hw {
       offset += strlen(MONERO_VERSION);
       this->buffer_send[4] = offset-5;
       this->length_send = offset;
-      this->exchange();      
+      this->exchange();
+
+      ASSERT_X(this->length_recv>=3, "Communication error, less than three bytes received. Check your application version.");
+
+      unsigned int device_version = 0;
+      device_version = VERSION(this->buffer_recv[0], this->buffer_recv[1], this->buffer_recv[2]);
+  
+      ASSERT_X (device_version >= MINIMAL_APP_VERSION,  
+                "Unsupported device application version: " << VERSION_MAJOR(device_version)<<"."<<VERSION_MINOR(device_version)<<"."<<VERSION_MICRO(device_version) << 
+                " At least " << MINIMAL_APP_VERSION_MAJOR<<"."<<MINIMAL_APP_VERSION_MINOR<<"."<<MINIMAL_APP_VERSION_MICRO<<" is required.");
+     
       return true;
     }
      
diff --git a/src/device/device_ledger.hpp b/src/device/device_ledger.hpp
index b635db826..5bc617f80 100644
--- a/src/device/device_ledger.hpp
+++ b/src/device/device_ledger.hpp
@@ -41,6 +41,18 @@ namespace hw {
 
     namespace ledger {
 
+    /* Minimal supported version */
+    #define MINIMAL_APP_VERSION_MAJOR    1
+    #define MINIMAL_APP_VERSION_MINOR    3
+    #define MINIMAL_APP_VERSION_MICRO    0
+
+    #define VERSION(M,m,u)       ((M)<<16|(m)<<8|(u))
+    #define VERSION_MAJOR(v)     (((v)>>16)&0xFF)
+    #define VERSION_MINOR(v)     (((v)>>8)&0xFF)
+    #define VERSION_MICRO(v)     (((v)>>0)&0xFF)
+    
+    #define MINIMAL_APP_VERSION   VERSION(MINIMAL_APP_VERSION_MAJOR, MINIMAL_APP_VERSION_MINOR, MINIMAL_APP_VERSION_MICRO)
+
     void register_all(std::map<std::string, std::unique_ptr<device>> &registry);
 
     #ifdef WITH_DEVICE_LEDGER