Magisk/native/jni/magiskboot/main.cpp
2020-06-17 01:17:28 -07:00

196 lines
5.5 KiB
C++

#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <unistd.h>
#include <sys/mman.h>
#include <mincrypt/sha.h>
#include <utils.hpp>
#include "magiskboot.hpp"
#include "compress.hpp"
using namespace std;
static void usage(char *arg0) {
fprintf(stderr,
R"EOF(MagiskBoot - Boot Image Modification Tool
Usage: %s <action> [args...]
Supported actions:
unpack [-n] [-h] <bootimg>
Unpack <bootimg> to, if available, kernel, kernel_dtb, ramdisk.cpio,
second, dtb, extra, and recovery_dtbo into current directory.
If '-n' is provided, it will not attempt to decompress kernel or
ramdisk.cpio from their original formats.
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 in-place)
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
Apply ramdisk patches
Configure with env variables: KEEPVERITY KEEPFORCEENCRYPT
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 <input> <action> [args...]
Do dtb related actions to <input>
Supported actions:
print [-f]
Print all contents of dtb for debugging
Specify [-f] to only print fstab nodes
patch
Search for fstab and remove verity/avb
Modifications are done directly to the file in-place
Configure with env variables: KEEPVERITY
split <input>
Split image.*-dtb into kernel + kernel_dtb
sha1 <file>
Print the SHA1 checksum for <file>
cleanup
Cleanup the current working directory
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, "\n\n");
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 == "split") {
return split_image_dtb(argv[2]);
} else if (argc > 2 && action == "unpack") {
int idx = 2;
bool nodecomp = false;
bool hdr = false;
for (;;) {
if (idx >= argc)
usage(argv[0]);
if (argv[idx][0] != '-')
break;
for (char *flag = &argv[idx][1]; *flag; ++flag) {
if (*flag == 'n')
nodecomp = true;
else if (*flag == 'h')
hdr = true;
else
usage(argv[0]);
}
++idx;
}
return unpack(argv[idx], nodecomp, hdr);
} 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 > 3 && action == "dtb") {
if (dtb_commands(argc - 2, argv + 2))
usage(argv[0]);
} else {
usage(argv[0]);
}
return 0;
}