Magisk/native/jni/magiskboot/main.cpp

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>

#include <mincrypt/sha.h>
#include <logging.h>
#include <utils.h>
#include <flags.h>

#include "magiskboot.h"
#include "compress.h"

using namespace std;

static void usage(char *arg0) {
	fprintf(stderr,
FULL_VER(MagiskBoot) R"EOF(  - Boot Image Modification Tool

Usage: %s <action> [args...]

Supported actions:
  unpack [-h] <bootimg>
    Unpack <bootimg> to, if available, kernel, kernel_dtb, ramdisk.cpio,
    second, dtb, extra, and recovery_dtbo into current directory.
    If '-h' is provided, it will dump header info to 'header',
    which will be parsed when repacking.
    Return values:
    0:valid    1:error    2:chromeos

  repack [-n] <origbootimg> [outbootimg]
    Repack boot image components from current directory
    to [outbootimg], or new-boot.img if not specified.
    If '-n' is provided, it will not attempt to recompress ramdisk.cpio,
    otherwise it will compress ramdisk.cpio and kernel with the same method
    in <origbootimg> if the file provided is not already compressed.

  hexpatch <file> <hexpattern1> <hexpattern2>
    Search <hexpattern1> in <file>, and replace with <hexpattern2>

  cpio <incpio> [commands...]
    Do cpio commands to <incpio> (modifications are done directly)
    Each command is a single argument, add quotes for each command
    Supported commands:
      exists ENTRY
        Return 0 if ENTRY exists, else return 1
      rm [-r] ENTRY
        Remove ENTRY, specify [-r] to remove recursively
      mkdir MODE ENTRY
        Create directory ENTRY in permissions MODE
      ln TARGET ENTRY
        Create a symlink to TARGET with the name ENTRY
      mv SOURCE DEST
        Move SOURCE to DEST
      add MODE ENTRY INFILE
        Add INFILE as ENTRY in permissions MODE; replaces ENTRY if exists
      extract [ENTRY OUT]
        Extract ENTRY to OUT, or extract all entries to current directory
      test
        Test the current cpio's patch status
        Return values:
        0:stock    1:Magisk    2:unsupported (phh, SuperSU, Xposed)
      patch KEEPVERITY KEEPFORCEENCRYPT
        Ramdisk patches. KEEP**** are boolean values
      backup ORIG
        Create ramdisk backups from ORIG
      restore
        Restore ramdisk from ramdisk backup stored within incpio
      sha1
        Print stock boot SHA1 if previously backed up in ramdisk

  dtb <dtb> <command> [args...]
    Do commands to <dtb> (modifications are done directly)
    Supported commands:
      print [-f]
        Print all contents from dtb for debugging
        Specify [-f] to only print fstab nodes
      test
        Check if fstab has verity/avb flags
        Return values:
        0:flag exists    1:no flags
      patch
        Search for fstab and remove verity/avb

  compress[=method] <infile> [outfile]
    Compress <infile> with [method] (default: gzip), optionally to [outfile]
    <infile>/[outfile] can be '-' to be STDIN/STDOUT
    Supported methods: )EOF", arg0);

	for (auto &it : name2fmt)
		fprintf(stderr, "%s ", it.first.data());

	fprintf(stderr, R"EOF(

  decompress <infile> [outfile]
    Detect method and decompress <infile>, optionally to [outfile]
    <infile>/[outfile] can be '-' to be STDIN/STDOUT
    Supported methods: )EOF");

	for (auto &it : name2fmt)
		fprintf(stderr, "%s ", it.first.data());

	fprintf(stderr, R"EOF(

  sha1 <file>
    Print the SHA1 checksum for <file>

  cleanup
    Cleanup the current working directory

)EOF");

	exit(1);
}

int main(int argc, char *argv[]) {
	cmdline_logging();
	umask(0);

	if (argc < 2)
		usage(argv[0]);

	// Skip '--' for backwards compatibility
	string_view action(argv[1]);
	if (str_starts(action, "--"))
		action = argv[1] + 2;

	if (action == "cleanup") {
		fprintf(stderr, "Cleaning up...\n");
		unlink(HEADER_FILE);
		unlink(KERNEL_FILE);
		unlink(RAMDISK_FILE);
		unlink(SECOND_FILE);
		unlink(KER_DTB_FILE);
		unlink(EXTRA_FILE);
		unlink(RECV_DTBO_FILE);
		unlink(DTB_FILE);
	} else if (argc > 2 && action == "sha1") {
		uint8_t sha1[SHA_DIGEST_SIZE];
		void *buf;
		size_t size;
		mmap_ro(argv[2], buf, size);
		SHA_hash(buf, size, sha1);
		for (uint8_t i : sha1)
			printf("%02x", i);
		printf("\n");
		munmap(buf, size);
	} else if (argc > 2 && action == "unpack") {
		if (argv[2] == "-h"sv) {
			if (argc == 3)
				usage(argv[0]);
			return unpack(argv[3], true);
		} else {
			return unpack(argv[2]);
		}
	} else if (argc > 2 && action == "repack") {
		if (argv[2] == "-n"sv) {
			if (argc == 3)
				usage(argv[0]);
			repack(argv[3], argv[4] ? argv[4] : NEW_BOOT, true);
		} else {
			repack(argv[2], argv[3] ? argv[3] : NEW_BOOT);
		}
	} else if (argc > 2 && action == "decompress") {
		decompress(argv[2], argv[3]);
	} else if (argc > 2 && str_starts(action, "compress")) {
		compress(action[8] == '=' ? &action[9] : "gzip", argv[2], argv[3]);
	} else if (argc > 4 && action == "hexpatch") {
		return hexpatch(argv[2], argv[3], argv[4]);
	} else if (argc > 2 && action == "cpio"sv) {
		if (cpio_commands(argc - 2, argv + 2))
			usage(argv[0]);
	} else if (argc > 2 && action == "dtb") {
		if (dtb_commands(argc - 2, argv + 2))
			usage(argv[0]);
	} else {
		usage(argv[0]);
	}

	return 0;
}