libbinder_ndk: support handleShellCommand
At the NDK layer:
AIBinder_Class_setHandleShellCommand (to implement handleShellCommand)
At the AIDL layer:
ICInterface::dump (to override default handleShellCommand)
Test: m libbinder_ndk
Test: atest CtsNdkBinderTestCases
Test: atest libbinder_ndk_unit_test
Bug: 148692423
Change-Id: I1fec523b0ca59466d117c94243176ff123389a9a
diff --git a/libs/binder/ndk/ibinder.cpp b/libs/binder/ndk/ibinder.cpp
index e752c45..75dcdc8 100644
--- a/libs/binder/ndk/ibinder.cpp
+++ b/libs/binder/ndk/ibinder.cpp
@@ -24,10 +24,13 @@
#include <android-base/logging.h>
#include <binder/IPCThreadState.h>
+#include <binder/IResultReceiver.h>
+#include <private/android_filesystem_config.h>
using DeathRecipient = ::android::IBinder::DeathRecipient;
using ::android::IBinder;
+using ::android::IResultReceiver;
using ::android::Parcel;
using ::android::sp;
using ::android::status_t;
@@ -158,6 +161,45 @@
binder_status_t status = getClass()->onTransact(this, code, &in, &out);
return PruneStatusT(status);
+ } else if (code == SHELL_COMMAND_TRANSACTION) {
+ int in = data.readFileDescriptor();
+ int out = data.readFileDescriptor();
+ int err = data.readFileDescriptor();
+
+ int argc = data.readInt32();
+ std::vector<String8> utf8Args; // owns memory of utf8s
+ std::vector<const char*> utf8Pointers; // what can be passed over NDK API
+ for (int i = 0; i < argc && data.dataAvail() > 0; i++) {
+ utf8Args.push_back(String8(data.readString16()));
+ utf8Pointers.push_back(utf8Args[i].c_str());
+ }
+
+ data.readStrongBinder(); // skip over the IShellCallback
+ sp<IResultReceiver> resultReceiver = IResultReceiver::asInterface(data.readStrongBinder());
+
+ // Shell commands should only be callable by ADB.
+ uid_t uid = AIBinder_getCallingUid();
+ if (uid != AID_ROOT && uid != AID_SHELL) {
+ if (resultReceiver != nullptr) {
+ resultReceiver->send(-1);
+ }
+ return STATUS_PERMISSION_DENIED;
+ }
+
+ // Check that the file descriptors are valid.
+ if (in == STATUS_BAD_TYPE || out == STATUS_BAD_TYPE || err == STATUS_BAD_TYPE) {
+ if (resultReceiver != nullptr) {
+ resultReceiver->send(-1);
+ }
+ return STATUS_BAD_VALUE;
+ }
+
+ binder_status_t status = getClass()->handleShellCommand(
+ this, in, out, err, utf8Pointers.data(), utf8Pointers.size());
+ if (resultReceiver != nullptr) {
+ resultReceiver->send(status);
+ }
+ return status;
} else {
return BBinder::onTransact(code, data, reply, flags);
}
@@ -266,6 +308,13 @@
clazz->onDump = onDump;
}
+void AIBinder_Class_setHandleShellCommand(AIBinder_Class* clazz,
+ AIBinder_handleShellCommand handleShellCommand) {
+ CHECK(clazz != nullptr) << "setHandleShellCommand requires non-null clazz";
+
+ clazz->handleShellCommand = handleShellCommand;
+}
+
void AIBinder_DeathRecipient::TransferDeathRecipient::binderDied(const wp<IBinder>& who) {
CHECK(who == mWho);