binder: add openDeclaredPassthroughHal()

It handles dlopen()ing a declared native hal. This can replace
android_load_sphal_library to load declared native instance. The new API
also supports when instances are from APEX.

Bug: 316051788
Test: atest servicemanager_test
Test: atest vts_treble_vintf_vendor_test
Change-Id: I95b752253e0b550d38f0543ff56134d38d838855

1 files changed, 26 insertions, 0 deletions

diff --git a/libs/binder/IServiceManager.cpp b/libs/binder/IServiceManager.cpp
index fe566fccb2..39573ec54d 100644
--- a/libs/binder/IServiceManager.cpp
+++ b/libs/binder/IServiceManager.cpp
@@ -40,6 +40,11 @@
 #include "ServiceManagerHost.h"
 #endif
 
+#if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__) && !defined(__ANDROID_NATIVE_BRIDGE__)
+#include <android/apexsupport.h>
+#include <vndksupport/linker.h>
+#endif
+
 #include "Static.h"
 
 namespace android {
@@ -259,6 +264,27 @@ bool checkPermission(const String16& permission, pid_t pid, uid_t uid, bool logP
     }
 }
 
+void* openDeclaredPassthroughHal(const String16& interface, const String16& instance, int flag) {
+#if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__) && !defined(__ANDROID_NATIVE_BRIDGE__)
+    sp<IServiceManager> sm = defaultServiceManager();
+    String16 name = interface + String16("/") + instance;
+    if (!sm->isDeclared(name)) {
+        return nullptr;
+    }
+    String16 libraryName = interface + String16(".") + instance + String16(".so");
+    if (auto updatableViaApex = sm->updatableViaApex(name); updatableViaApex.has_value()) {
+        return AApexSupport_loadLibrary(String8(libraryName).c_str(),
+                                        String8(*updatableViaApex).c_str(), flag);
+    }
+    return android_load_sphal_library(String8(libraryName).c_str(), flag);
+#else
+    (void)interface;
+    (void)instance;
+    (void)flag;
+    return nullptr;
+#endif
+}
+
 #endif //__ANDROID_VNDK__
 
 // ----------------------------------------------------------------------