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Fix[ffmpeg_plugin]: replace LD_LIBRARY_PATH/PATH for ffmpeg, switch d…
…efault exec mode
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| // | ||
| // Created by maks on 05.01.2025. | ||
| // | ||
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| #include <jni.h> | ||
| #include <libgen.h> | ||
| #include <string.h> | ||
| #include <stdlib.h> | ||
| #include <dlfcn.h> | ||
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| #include <environ/environ.h> | ||
| #include <android/log.h> | ||
| #include <utils.h> | ||
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| static jint (*orig_ProcessImpl_forkAndExec)(JNIEnv *env, jobject process, jint mode, jbyteArray helperpath, jbyteArray prog, jbyteArray argBlock, jint argc, jbyteArray envBlock, jint envc, jbyteArray dir, jintArray std_fds, jboolean redirectErrorStream); | ||
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| // Turn a C-style string into a Java byte array | ||
| static jbyteArray stringToBytes(JNIEnv *env, const char* string) { | ||
| const jsize string_data_len = (jsize)(strlen(string) + 1); | ||
| jbyteArray result = (*env)->NewByteArray(env, (jsize)string_data_len); | ||
| (*env)->SetByteArrayRegion(env, result, 0, (jsize)string_data_len, (const jbyte*) string); | ||
| return result; | ||
| } | ||
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| // Replace the env block with the one that has the desired LD_LIBRARY_PATH/PATH. | ||
| // (Due to my laziness this ignores the current contents of the block) | ||
| static void replaceLibPathInEnvBlock(JNIEnv *env, jbyteArray* envBlock, jint* envc, const char* directory) { | ||
| static bool env_block_replacement_warning = false; | ||
| if(*envBlock != NULL && !env_block_replacement_warning) { | ||
| printf("exec_hooks WARN: replaceLibPathInEnvBlock does not preserve original env. Please notify PojavLauncherTeam if you need that feature\n"); | ||
| env_block_replacement_warning = true; | ||
| } | ||
| char envStr[1024]; | ||
| jsize new_envl = snprintf(envStr, sizeof(envStr) / sizeof(char), "LD_LIBRARY_PATH=%s%cPATH=%s", directory, 0 ,directory) + 1; | ||
| jbyteArray newBlock = (*env)->NewByteArray(env, new_envl); | ||
| (*env)->SetByteArrayRegion(env, newBlock, 0, new_envl, (jbyte*) envStr); | ||
| *envBlock = newBlock; | ||
| *envc = 2; | ||
| } | ||
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| /** | ||
| * Hooked version of java.lang.UNIXProcess.forkAndExec() | ||
| * which is used to handle the "open" command and "ffmpeg" invocations | ||
| */ | ||
| static jint hooked_ProcessImpl_forkAndExec(JNIEnv *env, jobject process, jint mode, jbyteArray helperpath, jbyteArray prog, jbyteArray argBlock, jint argc, jbyteArray envBlock, jint envc, jbyteArray dir, jintArray std_fds, jboolean redirectErrorStream) { | ||
| const char *pProg = (char *)((*env)->GetByteArrayElements(env, prog, NULL)); | ||
| const char* pProgBaseName = basename(pProg); | ||
| const size_t basename_len = strlen(pProgBaseName); | ||
| char prog_basename[basename_len]; | ||
| memcpy(&prog_basename, pProgBaseName, basename_len + 1); | ||
| (*env)->ReleaseByteArrayElements(env, prog, (jbyte *)pProg, 0); | ||
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| if(strcmp(prog_basename, "xdg-open") == 0) { | ||
| // When invoking xdg-open, send the open URL into Android | ||
| Java_org_lwjgl_glfw_CallbackBridge_nativeClipboard(env, NULL, /* CLIPBOARD_OPEN */ 2002, argBlock); | ||
| return 0; | ||
| }else if(strcmp(prog_basename, "ffmpeg") == 0) { | ||
| // When invoking ffmpeg, always replace the program path with the path to ffmpeg from the plugin. | ||
| // This allows us to replace the executable name, which is needed because android doesn't allow | ||
| // us to put files that don't start with "lib" and end with ".so" into folders that we can execute | ||
| // from | ||
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| // Also add LD_LIBRARY_PATH and PATH for the lib in order to override the ones from the launcher, since | ||
| // they may interfere with ffmpeg dependencies. | ||
| const char* ffmpeg_path = getenv("POJAV_FFMPEG_PATH"); | ||
| prog = NULL; | ||
| if(ffmpeg_path != NULL) { | ||
| replaceLibPathInEnvBlock(env, &envBlock, &envc, dirname(ffmpeg_path)); | ||
| prog = stringToBytes(env, ffmpeg_path); | ||
| } | ||
| } | ||
| return orig_ProcessImpl_forkAndExec(env, process, mode, helperpath, prog, argBlock, argc, envBlock, envc, dir, std_fds, redirectErrorStream); | ||
| } | ||
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| // Hook the forkAndExec method in the Java runtime for custom executable overriding. | ||
| void hookExec() { | ||
| jclass cls; | ||
| orig_ProcessImpl_forkAndExec = dlsym(RTLD_DEFAULT, "Java_java_lang_UNIXProcess_forkAndExec"); | ||
| if (!orig_ProcessImpl_forkAndExec) { | ||
| orig_ProcessImpl_forkAndExec = dlsym(RTLD_DEFAULT, "Java_java_lang_ProcessImpl_forkAndExec"); | ||
| cls = (*pojav_environ->runtimeJNIEnvPtr_JRE)->FindClass(pojav_environ->runtimeJNIEnvPtr_JRE, "java/lang/ProcessImpl"); | ||
| } else { | ||
| cls = (*pojav_environ->runtimeJNIEnvPtr_JRE)->FindClass(pojav_environ->runtimeJNIEnvPtr_JRE, "java/lang/UNIXProcess"); | ||
| } | ||
| JNINativeMethod methods[] = { | ||
| {"forkAndExec", "(I[B[B[BI[BI[B[IZ)I", (void *)&hooked_ProcessImpl_forkAndExec} | ||
| }; | ||
| (*pojav_environ->runtimeJNIEnvPtr_JRE)->RegisterNatives(pojav_environ->runtimeJNIEnvPtr_JRE, cls, methods, 1); | ||
| printf("Registered forkAndExec\n"); | ||
| } |