From 5235f87126cc2bca3907daada9f59e0c7c7bc834 Mon Sep 17 00:00:00 2001
From: Emiel Bruijntjes <emiel.bruijntjes@copernica.com>
Date: Tue, 20 Jan 2015 13:45:17 +0100
Subject: PHP-CPP now checks whether an already compiled extension is still
 compatible with the PHP-CPP library. This prevents weird crashes when users
 update their PHP-CPP library, without recompiling their extensions

---
 zend/extensionimpl.cpp | 59 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

(limited to 'zend/extensionimpl.cpp')

diff --git a/zend/extensionimpl.cpp b/zend/extensionimpl.cpp
index 262ecdb..fd97a76 100644
--- a/zend/extensionimpl.cpp
+++ b/zend/extensionimpl.cpp
@@ -219,13 +219,35 @@ int ExtensionImpl::processIdle(int type, int module_number TSRMLS_DC)
     return BOOL2SUCCESS(true);
 }
 
+/**
+ *  Function that is called when the PHP engine initializes with a different PHP-CPP
+ *  version for the libphpcpp.so file than the version the extension was compiled for
+ *  @param  type        Module type
+ *  @param  number      Module number
+ *  @param  tsrm_ls
+ *  @return int         0 on success
+ */
+int ExtensionImpl::processMismatch(int type, int module_number TSRMLS_DC)
+{
+    // get the extension
+    auto *extension = find(module_number TSRMLS_CC);
+    
+    // report a warning
+    warning << "Version mismatch between PHP-CPP and extension " << extension->name() << " " << extension->version() << " (recompile needed?)" << std::endl;
+    
+    // done
+    return BOOL2SUCCESS(true);
+}
+
 /**
  *  Constructor
  *  @param  data        Pointer to the extension object created by the extension programmer
  *  @param  name        Name of the extension
  *  @param  version     Version number
+ *  @param  apiversion  API version number
  */
-ExtensionImpl::ExtensionImpl(Extension *data, const char *name, const char *version) : ExtensionBase(data)
+ExtensionImpl::ExtensionImpl(Extension *data, const char *name, const char *version, int apiversion) : 
+    ExtensionBase(data)
 {
     // keep extension pointer based on the name
     name2extension[name] = this;
@@ -262,6 +284,17 @@ ExtensionImpl::ExtensionImpl(Extension *data, const char *name, const char *vers
     _entry.globals_ptr = NULL;
 #endif
 
+    // everything is ok if the api versions match
+    if (apiversion == PHPCPP_API_VERSION) return;
+    
+    // mismatch between api versions, the extension is invalid, we use a 
+    // different startup function to report to the user
+    _entry.module_startup_func = &ExtensionImpl::processMismatch;
+
+    // the other callback functions are no longer necessary
+    _entry.module_shutdown_func = nullptr;
+    _entry.request_startup_func = nullptr;
+    _entry.request_shutdown_func = nullptr;
 }
 
 /**
@@ -276,6 +309,26 @@ ExtensionImpl::~ExtensionImpl()
     if (_entry.functions) delete[] _entry.functions;
 }
 
+/**
+ *  The extension name
+ *  @return const char *
+ */
+const char *ExtensionImpl::name() const
+{
+    // name is stored in the struct
+    return _entry.name;
+}
+
+/**
+ *  The extension version
+ *  @return const char *
+ */
+const char *ExtensionImpl::version() const
+{
+    // version is stored in the struct
+    return _entry.version;
+}
+
 /**
  *  Retrieve the module entry
  *  @return zend_module_entry
@@ -285,6 +338,10 @@ zend_module_entry *ExtensionImpl::module()
     // check if functions were already defined
     if (_entry.functions) return &_entry;
 
+    // if the 'processMismatch' function is installed, the API version is wrong,
+    // and nothing should be initialized
+    if (_entry.module_startup_func == &ExtensionImpl::processMismatch) return &_entry;
+
     // the number of functions
     int count = _data->functions();
     
-- 
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