/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "applypatch_modes.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <memory>
#include <string>
#include <vector>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/strings.h>
#include <openssl/sha.h>
#include "applypatch/applypatch.h"
#include "edify/expr.h"
static int CheckMode(int argc, const char** argv) {
if (argc < 3) {
return 2;
}
std::vector<std::string> sha1;
for (int i = 3; i < argc; i++) {
sha1.push_back(argv[i]);
}
return applypatch_check(argv[2], sha1);
}
// Parse arguments (which should be of the form "<sha1>:<filename>" into the
// new parallel arrays *sha1s and *files. Returns true on success.
static bool ParsePatchArgs(int argc, const char** argv, std::vector<std::string>* sha1s,
std::vector<FileContents>* files) {
if (sha1s == nullptr) {
return false;
}
for (int i = 0; i < argc; ++i) {
std::vector<std::string> pieces = android::base::Split(argv[i], ":");
if (pieces.size() != 2) {
LOG(ERROR) << "Failed to parse patch argument \"" << argv[i] << "\"";
return false;
}
uint8_t digest[SHA_DIGEST_LENGTH];
if (ParseSha1(pieces[0], digest) != 0) {
LOG(ERROR) << "Failed to parse SHA-1 \"" << argv[i] << "\"";
return false;
}
sha1s->push_back(pieces[0]);
FileContents fc;
if (LoadFileContents(pieces[1].c_str(), &fc) != 0) {
return false;
}
files->push_back(std::move(fc));
}
return true;
}
static int FlashMode(const char* src_filename, const char* tgt_filename,
const char* tgt_sha1, size_t tgt_size) {
return applypatch_flash(src_filename, tgt_filename, tgt_sha1, tgt_size);
}
static int PatchMode(int argc, const char** argv) {
std::unique_ptr<Value> bonus;
if (argc >= 3 && strcmp(argv[1], "-b") == 0) {
FileContents bonus_fc;
if (LoadFileContents(argv[2], &bonus_fc) != 0) {
LOG(ERROR) << "Failed to load bonus file " << argv[2];
return 1;
}
bonus = std::make_unique<Value>(Value::Type::BLOB,
std::string(bonus_fc.data.cbegin(), bonus_fc.data.cend()));
argc -= 2;
argv += 2;
}
if (argc < 4) {
return 2;
}
size_t target_size;
if (!android::base::ParseUint(argv[4], &target_size) || target_size == 0) {
LOG(ERROR) << "Failed to parse \"" << argv[4] << "\" as byte count";
return 1;
}
// If no <src-sha1>:<patch> is provided, it is in flash mode.
if (argc == 5) {
if (bonus) {
LOG(ERROR) << "bonus file not supported in flash mode";
return 1;
}
return FlashMode(argv[1], argv[2], argv[3], target_size);
}
std::vector<std::string> sha1s;
std::vector<FileContents> files;
if (!ParsePatchArgs(argc - 5, argv + 5, &sha1s, &files)) {
LOG(ERROR) << "Failed to parse patch args";
return 1;
}
std::vector<std::unique_ptr<Value>> patches;
for (const auto& file : files) {
patches.push_back(std::make_unique<Value>(Value::Type::BLOB,
std::string(file.data.cbegin(), file.data.cend())));
}
return applypatch(argv[1], argv[2], argv[3], target_size, sha1s, patches, bonus.get());
}
// This program (applypatch) applies binary patches to files in a way that
// is safe (the original file is not touched until we have the desired
// replacement for it) and idempotent (it's okay to run this program
// multiple times).
//
// - if the sha1 hash of <tgt-file> is <tgt-sha1>, does nothing and exits
// successfully.
//
// - otherwise, if no <src-sha1>:<patch> is provided, flashes <tgt-file> with
// <src-file>. <tgt-file> must be a partition name, while <src-file> must
// be a regular image file. <src-file> will not be deleted on success.
//
// - otherwise, if the sha1 hash of <src-file> is <src-sha1>, applies the
// bsdiff <patch> to <src-file> to produce a new file (the type of patch
// is automatically detected from the file header). If that new
// file has sha1 hash <tgt-sha1>, moves it to replace <tgt-file>, and
// exits successfully. Note that if <src-file> and <tgt-file> are
// not the same, <src-file> is NOT deleted on success. <tgt-file>
// may be the string "-" to mean "the same as src-file".
//
// - otherwise, or if any error is encountered, exits with non-zero
// status.
//
// <src-file> (or <file> in check mode) may refer to an EMMC partition
// to read the source data. See the comments for the
// LoadPartitionContents() function for the format of such a filename.
int applypatch_modes(int argc, const char** argv) {
if (argc < 2) {
usage:
// clang-format off
LOG(INFO) << "Usage: \n"
<< " " << argv[0] << " [-b <bonus-file>] <src-file> <tgt-file> <tgt-sha1> "
"<tgt-size> [<src-sha1>:<patch> ...]\n"
<< " " << argv[0] << " -c <file> [<sha1> ...]\n"
<< " " << argv[0] << " -l\n"
<< "\n"
<< "Filenames may be of the form\n"
<< " EMMC:<partition>:<len_1>:<sha1_1>:<len_2>:<sha1_2>:...\n"
<< "to specify reading from or writing to an EMMC partition.\n\n";
// clang-format on
return 2;
}
int result;
if (strncmp(argv[1], "-l", 3) == 0) {
result = ShowLicenses();
} else if (strncmp(argv[1], "-c", 3) == 0) {
result = CheckMode(argc, argv);
} else {
result = PatchMode(argc, argv);
}
if (result == 2) {
goto usage;
}
return result;
}
