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Merge pull request #221 from ElderDrivers/resources-hook
Add resources hook
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| // | ||
| // Created by solo on 2019/3/24. | ||
| // | ||
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| #ifndef EDXPOSED_TEMP_BYTEORDER_H | ||
| #define EDXPOSED_TEMP_BYTEORDER_H | ||
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| #include <cstdint> | ||
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| static inline uint32_t android_swap_long(uint32_t v) | ||
| { | ||
| return (v<<24) | ((v<<8)&0x00FF0000) | ((v>>8)&0x0000FF00) | (v>>24); | ||
| } | ||
| static inline uint16_t android_swap_short(uint16_t v) | ||
| { | ||
| return (v<<8) | (v>>8); | ||
| } | ||
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| #define DEVICE_BYTE_ORDER LITTLE_ENDIAN | ||
| #if BYTE_ORDER == DEVICE_BYTE_ORDER | ||
| #define dtohl(x) (x) | ||
| #define dtohs(x) (x) | ||
| #define htodl(x) (x) | ||
| #define htods(x) (x) | ||
| #else | ||
| #define dtohl(x) (android_swap_long(x)) | ||
| #define dtohs(x) (android_swap_short(x)) | ||
| #define htodl(x) (android_swap_long(x)) | ||
| #define htods(x) (android_swap_short(x)) | ||
| #endif | ||
| #if BYTE_ORDER == LITTLE_ENDIAN | ||
| #define fromlel(x) (x) | ||
| #define fromles(x) (x) | ||
| #define tolel(x) (x) | ||
| #define toles(x) (x) | ||
| #else | ||
| #define fromlel(x) (android_swap_long(x)) | ||
| #define fromles(x) (android_swap_short(x)) | ||
| #define tolel(x) (android_swap_long(x)) | ||
| #define toles(x) (android_swap_short(x)) | ||
| #endif | ||
|
|
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| #endif //EDXPOSED_TEMP_BYTEORDER_H |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,169 @@ | ||
| // | ||
| // Created by solo on 2019/3/24. | ||
| // | ||
|
|
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| #include <jni.h> | ||
| #include <include/ByteOrder.h> | ||
| #include <include/logging.h> | ||
| #include <dlfcn.h> | ||
| #include "resource_hook.h" | ||
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| #define CLASS_XRESOURCES "android/content/res/XResources" | ||
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| jclass classXResources; | ||
| jmethodID methodXResourcesTranslateAttrId; | ||
| jmethodID methodXResourcesTranslateResId; | ||
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| int32_t (*ResXMLParser_next)(void *); | ||
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| void (*ResXMLParser_restart)(void *); | ||
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| int32_t (*ResXMLParser_getAttributeNameID)(void *, int); | ||
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| char16_t *(*ResStringPool_stringAt)(const void *, int32_t, size_t *); | ||
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| bool prepareSymbols() { | ||
| void *fwHandle = dlopen(kLibFwPath, RTLD_LAZY | RTLD_GLOBAL); | ||
| if (!fwHandle) { | ||
| LOGE("can't open libandroidfw: %s", dlerror()); | ||
| return false; | ||
| } | ||
| ResXMLParser_next = reinterpret_cast<int32_t (*)(void *)>(dlsym(fwHandle, | ||
| "_ZN7android12ResXMLParser4nextEv")); | ||
| if (!ResXMLParser_next) { | ||
| LOGE("can't get ResXMLParser_next: %s", dlerror()); | ||
| return false; | ||
| } | ||
| ResXMLParser_restart = reinterpret_cast<void (*)(void *)>(dlsym(fwHandle, | ||
| "_ZN7android12ResXMLParser7restartEv")); | ||
| if (!ResXMLParser_restart) { | ||
| LOGE("can't get ResXMLParser_restart: %s", dlerror()); | ||
| return false; | ||
| } | ||
| ResXMLParser_getAttributeNameID = reinterpret_cast<int32_t (*)(void *, int)>(dlsym(fwHandle, | ||
| #if defined(__LP64__) | ||
| "_ZNK7android12ResXMLParser18getAttributeNameIDEm" | ||
| #else | ||
| "_ZNK7android12ResXMLParser18getAttributeNameIDEj" | ||
| #endif | ||
| )); | ||
| if (!ResXMLParser_getAttributeNameID) { | ||
| LOGE("can't get ResXMLParser_getAttributeNameID: %s", dlerror()); | ||
| return false; | ||
| } | ||
| ResStringPool_stringAt = reinterpret_cast<char16_t *(*)(const void *, int32_t, size_t *)>(dlsym( | ||
| fwHandle, | ||
| #if defined(__LP64__) | ||
| "_ZNK7android13ResStringPool8stringAtEmPm" | ||
| #else | ||
| "_ZNK7android13ResStringPool8stringAtEjPj" | ||
| #endif | ||
| )); | ||
| if (!ResStringPool_stringAt) { | ||
| LOGE("can't get ResStringPool_stringAt: %s", dlerror()); | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
|
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| jboolean XposedBridge_initXResourcesNative(JNIEnv *env, jclass) { | ||
| classXResources = env->FindClass(CLASS_XRESOURCES); | ||
| if (classXResources == NULL) { | ||
| LOGE("Error while loading XResources class '%s':", CLASS_XRESOURCES); | ||
| env->ExceptionClear(); | ||
| return false; | ||
| } | ||
| classXResources = reinterpret_cast<jclass>(env->NewGlobalRef(classXResources)); | ||
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| methodXResourcesTranslateResId = env->GetStaticMethodID(classXResources, "translateResId", | ||
| "(ILandroid/content/res/XResources;Landroid/content/res/Resources;)I"); | ||
| if (methodXResourcesTranslateResId == NULL) { | ||
| LOGE("ERROR: could not find method %s.translateResId(int, XResources, Resources)", | ||
| CLASS_XRESOURCES); | ||
| env->ExceptionClear(); | ||
| return false; | ||
| } | ||
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| methodXResourcesTranslateAttrId = env->GetStaticMethodID(classXResources, "translateAttrId", | ||
| "(Ljava/lang/String;Landroid/content/res/XResources;)I"); | ||
| if (methodXResourcesTranslateAttrId == NULL) { | ||
| LOGE("ERROR: could not find method %s.findAttrId(String, XResources)", CLASS_XRESOURCES); | ||
| env->ExceptionClear(); | ||
| return false; | ||
| } | ||
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| return prepareSymbols(); | ||
| } | ||
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| void XResources_rewriteXmlReferencesNative(JNIEnv *env, jclass, | ||
| jlong parserPtr, jobject origRes, jobject repRes) { | ||
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| ResXMLParser *parser = (ResXMLParser *) parserPtr; | ||
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| if (parser == nullptr) | ||
| return; | ||
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| const ResXMLTree &mTree = parser->mTree; | ||
| uint32_t *mResIds = (uint32_t *) mTree.mResIds; | ||
| ResXMLTree_attrExt *tag; | ||
| int attrCount; | ||
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| do { | ||
| switch (ResXMLParser_next(parser)) { | ||
| case ResXMLParser::START_TAG: | ||
| tag = (ResXMLTree_attrExt *) parser->mCurExt; | ||
| attrCount = dtohs(tag->attributeCount); | ||
| for (int idx = 0; idx < attrCount; idx++) { | ||
| ResXMLTree_attribute *attr = (ResXMLTree_attribute *) | ||
| (((const uint8_t *) tag) | ||
| + dtohs(tag->attributeStart) | ||
| + (dtohs(tag->attributeSize) * idx)); | ||
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| // find resource IDs for attribute names | ||
| int32_t attrNameID = ResXMLParser_getAttributeNameID(parser, idx); | ||
| // only replace attribute name IDs for app packages | ||
| if (attrNameID >= 0 && (size_t) attrNameID < mTree.mNumResIds && | ||
| dtohl(mResIds[attrNameID]) >= 0x7f000000) { | ||
| size_t attNameLen; | ||
| const char16_t *attrName = ResStringPool_stringAt(&(mTree.mStrings), | ||
| attrNameID, &attNameLen); | ||
| jint attrResID = env->CallStaticIntMethod(classXResources, | ||
| methodXResourcesTranslateAttrId, | ||
| env->NewString( | ||
| (const jchar *) attrName, | ||
| attNameLen), origRes); | ||
| if (env->ExceptionCheck()) | ||
| goto leave; | ||
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| mResIds[attrNameID] = htodl(attrResID); | ||
| } | ||
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| // find original resource IDs for reference values (app packages only) | ||
| if (attr->typedValue.dataType != Res_value::TYPE_REFERENCE) | ||
| continue; | ||
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| jint oldValue = dtohl(attr->typedValue.data); | ||
| if (oldValue < 0x7f000000) | ||
| continue; | ||
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| jint newValue = env->CallStaticIntMethod(classXResources, | ||
| methodXResourcesTranslateResId, | ||
| oldValue, origRes, repRes); | ||
| if (env->ExceptionCheck()) | ||
| goto leave; | ||
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| if (newValue != oldValue) | ||
| attr->typedValue.data = htodl(newValue); | ||
| } | ||
| continue; | ||
| case ResXMLParser::END_DOCUMENT: | ||
| case ResXMLParser::BAD_DOCUMENT: | ||
| goto leave; | ||
| default: | ||
| continue; | ||
| } | ||
| } while (true); | ||
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| leave: | ||
| ResXMLParser_restart(parser); | ||
| } |
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