android hook native函數，androidnative

android hook native函數，androidnative

大概2年前寫的代碼，今天突然要用到，找了半天，這裡記錄下

用到的庫: https://pan.baidu.com/s/1htuUQX2

#include <jni.h>#include <string>#include <dlfcn.h>typedef  int  (*  pfnMSHookFunction)(void* result, void* a2, void** a3);int Aaaaaa(jint a, jint b){    int bRet = 0;    bRet = a/3;    return  bRet;}extern  "C"JNIEXPORTint  Java_aaa_aaa_MainActivity_test(jint a,jint b){    FILE *fp = fopen("1.txt", "rb");    if (0 != fp)    {        printf("111");    }  return   Aaaaaa(a, b);}typedef FILE*    (*pfnmyfopen)(const char *, const char *);pfnmyfopen porg = 0;//fake 函數FILE    *myfopen(const char * name, const char * flag){    FILE* fret = 0;    fret =  porg(name,flag);    return  fret;}//這裡用的是substratevoid initHook(){   void* phandle =dlopen("libhook.so",RTLD_NOW );    pfnMSHookFunction pmsHook=(pfnMSHookFunction)dlsym(phandle,"MSHookFunction");    pmsHook((void*)fopen,(void*)myfopen,(void**)&porg);}jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved){    JNIEnv* env = 0;    jint result = -1;    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK)    {        return -1;    }    initHook();    result = JNI_VERSION_1_4;    return result;}