Magisk/native/jni/init/init.hpp
2020-09-04 06:21:25 -07:00

201 lines
4.2 KiB
C++

#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <stdlib.h>
#include <vector>
#include <utils.hpp>
struct cmdline {
bool skip_initramfs;
bool force_normal_boot;
char slot[3];
char dt_dir[64];
char hardware[32];
char hardware_plat[32];
};
struct data_holder {
uint8_t *buf = nullptr;
size_t sz = 0;
using str_pairs = std::initializer_list<std::pair<std::string_view, std::string_view>>;
int patch(str_pairs list);
bool contains(std::string_view pattern);
protected:
void consume(data_holder &other);
};
enum data_type { HEAP, MMAP };
template <data_type T>
struct auto_data : public data_holder {
auto_data<T>() = default;
auto_data<T>(const auto_data&) = delete;
auto_data<T>(auto_data<T> &&other) { consume(other); }
~auto_data<T>() {}
auto_data<T>& operator=(auto_data<T> &&other) { consume(other); return *this; }
};
template <> inline auto_data<MMAP>::~auto_data<MMAP>() { if (buf) munmap(buf, sz); }
template <> inline auto_data<HEAP>::~auto_data<HEAP>() { free(buf); }
namespace raw_data {
auto_data<HEAP> read(const char *name);
auto_data<HEAP> read(int fd);
auto_data<MMAP> mmap_rw(const char *name);
auto_data<MMAP> mmap_ro(const char *name);
}
struct fstab_entry {
std::string dev;
std::string mnt_point;
std::string type;
std::string mnt_flags;
std::string fsmgr_flags;
fstab_entry() = default;
fstab_entry(const fstab_entry &) = delete;
fstab_entry(fstab_entry &&o) = default;
void to_file(FILE *fp);
};
#define INIT_SOCKET "MAGISKINIT"
#define DEFAULT_DT_DIR "/proc/device-tree/firmware/android"
void load_kernel_info(cmdline *cmd);
bool check_two_stage();
int dump_magisk(const char *path, mode_t mode);
int magisk_proxy_main(int argc, char *argv[]);
void setup_klog();
void setup_tmp(const char *path, const data_holder &self, const data_holder &config);
/***************
* Base classes
***************/
class BaseInit {
protected:
cmdline *cmd;
char **argv;
std::vector<std::string> mount_list;
void exec_init() {
cleanup();
execv("/init", argv);
exit(1);
}
virtual void cleanup();
public:
BaseInit(char *argv[], cmdline *cmd) :
cmd(cmd), argv(argv), mount_list{"/sys", "/proc"} {}
virtual ~BaseInit() = default;
virtual void start() = 0;
void read_dt_fstab(std::vector<fstab_entry> &fstab);
void dt_early_mount();
};
class MagiskInit : public BaseInit {
protected:
auto_data<HEAP> self;
std::string persist_dir;
virtual void early_mount() = 0;
bool patch_sepolicy(const char *file);
public:
MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {}
};
class SARBase : public MagiskInit {
protected:
auto_data<HEAP> config;
std::vector<raw_file> overlays;
void backup_files();
void patch_rootdir();
void mount_system_root();
public:
SARBase(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {}
void start() override {
early_mount();
patch_rootdir();
exec_init();
}
};
/***************
* 2 Stage Init
***************/
class FirstStageInit : public BaseInit {
private:
void prepare();
public:
FirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
};
void start() override {
prepare();
exec_init();
}
};
class SARFirstStageInit : public SARBase {
private:
void prepare();
protected:
void early_mount() override;
public:
SARFirstStageInit(char *argv[], cmdline *cmd) : SARBase(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
};
void start() override {
early_mount();
prepare();
exec_init();
}
};
class SecondStageInit : public SARBase {
protected:
void early_mount() override;
void cleanup() override { /* Do not do any cleanup */ }
public:
SecondStageInit(char *argv[]) : SARBase(argv, nullptr) {
LOGD("%s\n", __FUNCTION__);
};
};
/*************
* Legacy SAR
*************/
class SARInit : public SARBase {
protected:
void early_mount() override;
public:
SARInit(char *argv[], cmdline *cmd) : SARBase(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
};
};
/************
* Initramfs
************/
class RootFSInit : public MagiskInit {
private:
void setup_rootfs();
protected:
void early_mount() override;
public:
RootFSInit(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {
LOGD("%s\n", __FUNCTION__);
}
void start() override {
early_mount();
setup_rootfs();
exec_init();
}
};