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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
/* Copyright 2022-2023 John "topjohnwu" Wu
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <cstdlib>
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#include <unistd.h>
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#include <fcntl.h>
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#include <android/log.h>
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#include "zygisk.hpp"
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using zygisk::Api;
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using zygisk::AppSpecializeArgs;
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using zygisk::ServerSpecializeArgs;
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#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, "MyModule", __VA_ARGS__)
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class MyModule : public zygisk::ModuleBase {
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public:
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void onLoad(Api *api, JNIEnv *env) override {
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this->api = api;
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this->env = env;
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}
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void preAppSpecialize(AppSpecializeArgs *args) override {
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// Use JNI to fetch our process name
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const char *process = env->GetStringUTFChars(args->nice_name, nullptr);
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preSpecialize(process);
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env->ReleaseStringUTFChars(args->nice_name, process);
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}
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void preServerSpecialize(ServerSpecializeArgs *args) override {
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preSpecialize("system_server");
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}
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private:
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Api *api;
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JNIEnv *env;
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void preSpecialize(const char *process) {
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// Demonstrate connecting to to companion process
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// We ask the companion for a random number
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unsigned r = 0;
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int fd = api->connectCompanion();
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read(fd, &r, sizeof(r));
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close(fd);
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LOGD("process=[%s], r=[%u]\n", process, r);
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// Since we do not hook any functions, we should let Zygisk dlclose ourselves
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api->setOption(zygisk::Option::DLCLOSE_MODULE_LIBRARY);
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}
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};
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static int urandom = -1;
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static void companion_handler(int i) {
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if (urandom < 0) {
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urandom = open("/dev/urandom", O_RDONLY);
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}
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unsigned r;
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read(urandom, &r, sizeof(r));
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LOGD("companion r=[%u]\n", r);
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write(i, &r, sizeof(r));
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}
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// Register our module class and the companion handler function
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REGISTER_ZYGISK_MODULE(MyModule)
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REGISTER_ZYGISK_COMPANION(companion_handler)
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