manager: Provide backward compatibility for legacy kernels

manager/app/src/main/cpp/legacy.c

@@ -0,0 +1,163 @@
+//
+// Created by shirkneko on 2025/11/3.
+//
+// Legacy Compatible
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <android/log.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <limits.h>
+
+#include "prelude.h"
+#include "ksu.h"
+
+#define KERNEL_SU_OPTION 0xDEADBEEF
+
+#define CMD_GRANT_ROOT 0
+
+#define CMD_BECOME_MANAGER 1
+#define CMD_GET_VERSION 2
+#define CMD_ALLOW_SU 3
+#define CMD_DENY_SU 4
+#define CMD_GET_SU_LIST 5
+#define CMD_GET_DENY_LIST 6
+#define CMD_CHECK_SAFEMODE 9
+
+#define CMD_GET_APP_PROFILE 10
+#define CMD_SET_APP_PROFILE 11
+
+#define CMD_IS_UID_GRANTED_ROOT 12
+#define CMD_IS_UID_SHOULD_UMOUNT 13
+#define CMD_IS_SU_ENABLED 14
+#define CMD_ENABLE_SU 15
+
+#define CMD_GET_VERSION_FULL 0xC0FFEE1A
+
+#define CMD_ENABLE_KPM 100
+#define CMD_HOOK_TYPE 101
+#define CMD_DYNAMIC_MANAGER 103
+#define CMD_GET_MANAGERS 104
+#define CMD_ENABLE_UID_SCANNER 105
+
+static bool ksuctl(int cmd, void* arg1, void* arg2) {
+    int32_t result = 0;
+    int32_t rtn = prctl(KERNEL_SU_OPTION, cmd, arg1, arg2, &result);
+    return result == KERNEL_SU_OPTION && rtn == -1;
+}
+
+struct ksu_version_info legacy_get_info()
+{
+    int32_t version = -1;
+    int32_t flags = 0;
+    ksuctl(CMD_GET_VERSION, &version, &flags);
+    return (struct ksu_version_info){version, flags};
+}
+
+bool legacy_get_allow_list(int *uids, int *size) {
+    return ksuctl(CMD_GET_SU_LIST, uids, size);
+}
+
+bool legacy_is_safe_mode() {
+    return ksuctl(CMD_CHECK_SAFEMODE, NULL, NULL);
+}
+
+bool legacy_uid_should_umount(int uid) {
+    int should;
+    return ksuctl(CMD_IS_UID_SHOULD_UMOUNT, (void*) ((size_t) uid), &should) && should;
+}
+
+bool legacy_set_app_profile(const struct app_profile* profile) {
+    return ksuctl(CMD_SET_APP_PROFILE, (void*) profile, NULL);
+}
+
+bool legacy_get_app_profile(char* key, struct app_profile* profile) {
+    return ksuctl(CMD_GET_APP_PROFILE, profile, NULL);
+}
+
+bool legacy_set_su_enabled(bool enabled) {
+    return ksuctl(CMD_ENABLE_SU, (void*) enabled, NULL);
+}
+
+bool legacy_is_su_enabled() {
+    int enabled = true;
+    // if ksuctl failed, we assume su is enabled, and it cannot be disabled.
+    ksuctl(CMD_IS_SU_ENABLED, &enabled, NULL);
+    return enabled;
+}
+
+bool legacy_is_KPM_enable() {
+    int enabled = false;
+    ksuctl(CMD_ENABLE_KPM, &enabled, NULL);
+    return enabled;
+}
+
+bool legacy_get_hook_type(char* hook_type, size_t size) {
+    if (hook_type == NULL || size == 0) {
+        return false;
+    }
+
+    static char cached_hook_type[16] = {0};
+    if (cached_hook_type[0] == '\0') {
+        if (!ksuctl(CMD_HOOK_TYPE, cached_hook_type, NULL)) {
+            strcpy(cached_hook_type, "Unknown");
+        }
+    }
+
+    strncpy(hook_type, cached_hook_type, size - 1);
+    hook_type[size - 1] = '\0';
+    return true;
+}
+
+void legacy_get_full_version(char* buff) {
+    ksuctl(CMD_GET_VERSION_FULL, buff, NULL);
+}
+
+bool legacy_set_dynamic_manager(unsigned int size, const char* hash) {
+    if (hash == NULL) {
+        return false;
+    }
+    struct dynamic_manager_user_config config;
+    config.operation = DYNAMIC_MANAGER_OP_SET;
+    config.size = size;
+    strncpy(config.hash, hash, sizeof(config.hash) - 1);
+    config.hash[sizeof(config.hash) - 1] = '\0';
+    return ksuctl(CMD_DYNAMIC_MANAGER, &config, NULL);
+}
+
+bool legacy_get_dynamic_manager(struct dynamic_manager_user_config* config) {
+    if (config == NULL) {
+        return false;
+    }
+    config->operation = DYNAMIC_MANAGER_OP_GET;
+    return ksuctl(CMD_DYNAMIC_MANAGER, config, NULL);
+}
+
+bool legacy_clear_dynamic_manager() {
+    struct dynamic_manager_user_config config;
+    config.operation = DYNAMIC_MANAGER_OP_CLEAR;
+    return ksuctl(CMD_DYNAMIC_MANAGER, &config, NULL);
+}
+
+bool legacy_get_managers_list(struct manager_list_info* info) {
+    if (info == NULL) {
+        return false;
+    }
+    return ksuctl(CMD_GET_MANAGERS, info, NULL);
+}
+
+bool legacy_is_uid_scanner_enabled() {
+    bool status = false;
+    ksuctl(CMD_ENABLE_UID_SCANNER, (void*)0, &status);
+    return status;
+}
+
+bool legacy_set_uid_scanner_enabled(bool enabled) {
+    return ksuctl(CMD_ENABLE_UID_SCANNER, (void*)1, (void*)enabled);
+}
+
+bool legacy_clear_uid_scanner_environment() {
+    return ksuctl(CMD_ENABLE_UID_SCANNER, (void*)2, NULL);
+}