Magisk/native/jni/init/init.h
2019-07-16 23:30:54 -07:00

160 lines
3.0 KiB
C++

#include <sys/mount.h>
#include <unistd.h>
#include <stdlib.h>
struct cmdline {
bool system_as_root;
bool force_normal_boot;
char slot[3];
char dt_dir[128];
};
struct raw_data {
uint8_t *buf = nullptr;
size_t sz = 0;
raw_data() = default;
raw_data(const raw_data&) = delete;
raw_data(raw_data &&d) {
buf = d.buf;
sz = d.sz;
d.buf = nullptr;
d.sz = 0;
}
~raw_data() {
free(buf);
}
};
/* *************
* Base classes
* *************/
class BaseInit {
protected:
cmdline *cmd;
char **argv;
void exec_init(const char *init = "/init") {
cleanup();
execv(init, argv);
exit(1);
}
virtual void cleanup() {
umount("/sys");
umount("/proc");
umount("/dev");
}
public:
BaseInit(char *argv[], cmdline *cmd) : cmd(cmd), argv(argv) {}
virtual ~BaseInit() = default;
virtual void start() = 0;
};
class MagiskInit : public BaseInit {
protected:
raw_data self;
bool mnt_system = false;
bool mnt_vendor = false;
bool mnt_product = false;
bool mnt_odm = false;
virtual void early_mount() = 0;
bool read_dt_fstab(const char *name, char *partname, char *fstype);
bool patch_sepolicy(const char *file = "/sepolicy");
void cleanup() override;
public:
MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
};
class RootFSInit : public MagiskInit {
protected:
int root = -1;
virtual void setup_rootfs();
public:
RootFSInit(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {};
void start() override {
early_mount();
setup_rootfs();
exec_init();
}
};
class SARCommon : public MagiskInit {
protected:
raw_data config;
dev_t system_dev;
void backup_files();
void patch_rootdir();
public:
SARCommon(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {};
void start() override {
early_mount();
patch_rootdir();
exec_init();
}
};
/* *******************
* Logical Partitions
* *******************/
class FirstStageInit : public BaseInit {
protected:
void prepare();
public:
FirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
void start() override {
prepare();
exec_init("/system/bin/init");
}
};
class SecondStageInit : public SARCommon {
protected:
void early_mount() override;
void cleanup() override { /* Do not do any cleanup */ }
public:
SecondStageInit(char *argv[]) : SARCommon(argv, nullptr) {};
};
/* ***********
* Normal SAR
* ***********/
class SARInit : public SARCommon {
protected:
void early_mount() override;
public:
SARInit(char *argv[], cmdline *cmd) : SARCommon(argv, cmd) {};
};
/* **********
* Initramfs
* **********/
class LegacyInit : public RootFSInit {
protected:
void early_mount() override;
public:
LegacyInit(char *argv[], cmdline *cmd) : RootFSInit(argv, cmd) {};
};
/* ****************
* Compat-mode SAR
* ****************/
class SARCompatInit : public RootFSInit {
protected:
void early_mount() override;
void setup_rootfs() override;
public:
SARCompatInit(char *argv[], cmdline *cmd) : RootFSInit(argv, cmd) {};
};
void load_kernel_info(cmdline *cmd);
int dump_magisk(const char *path, mode_t mode);
int magisk_proxy_main(int argc, char *argv[]);