Magisk/native/jni/init/init.h
2019-12-09 04:09:23 -05:00

166 lines
3.1 KiB
C++

#include <sys/mount.h>
#include <unistd.h>
#include <stdlib.h>
#include <vector>
struct cmdline {
bool skip_initramfs;
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;
std::vector<std::string> mount_list;
void exec_init(const char *init = "/init") {
cleanup();
execv(init, argv);
exit(1);
}
virtual void cleanup();
public:
BaseInit(char *argv[], cmdline *cmd) :
cmd(cmd), argv(argv), mount_list{"/sys", "/proc", "/dev"} {}
virtual ~BaseInit() = default;
virtual void start() = 0;
};
class MagiskInit : public BaseInit {
protected:
raw_data self;
virtual void early_mount() = 0;
bool patch_sepolicy(const char *file = "/sepolicy");
public:
MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
};
class RootFSBase : public MagiskInit {
protected:
int root = -1;
virtual void setup_rootfs();
public:
RootFSBase(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {};
void start() override {
early_mount();
setup_rootfs();
exec_init();
}
};
class SARBase : public MagiskInit {
protected:
raw_data config;
dev_t system_dev;
void backup_files();
void patch_rootdir();
public:
SARBase(char *argv[], cmdline *cmd) : MagiskInit(argv, cmd) {};
void start() override {
early_mount();
patch_rootdir();
exec_init();
}
};
/* *************
* 2 Stage Init
* *************/
class ABFirstStageInit : public BaseInit {
protected:
void prepare();
public:
ABFirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
void start() override {
prepare();
exec_init("/system/bin/init");
}
};
class AFirstStageInit : public BaseInit {
protected:
void prepare();
public:
AFirstStageInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};
void start() override {
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) {};
};
/* ***********
* Legacy SAR
* ***********/
class SARInit : public SARBase {
protected:
void early_mount() override;
public:
SARInit(char *argv[], cmdline *cmd) : SARBase(argv, cmd) {};
};
/* **********
* Initramfs
* **********/
class RootFSInit : public RootFSBase {
protected:
void early_mount() override;
public:
RootFSInit(char *argv[], cmdline *cmd) : RootFSBase(argv, cmd) {};
};
/* ****************
* Compat-mode SAR
* ****************/
class SARCompatInit : public RootFSBase {
protected:
void early_mount() override;
void setup_rootfs() override;
public:
SARCompatInit(char *argv[], cmdline *cmd) : RootFSBase(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[]);
void setup_klog();
void mount_sbin();