/*
* 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 "updater/updater.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <string>
#include <android-base/logging.h>
#include <android-base/strings.h>
#include <selinux/android.h>
#include <selinux/label.h>
#include <selinux/selinux.h>
#include <ziparchive/zip_archive.h>
#include "edify/expr.h"
#include "otafault/config.h"
#include "otautil/DirUtil.h"
#include "otautil/SysUtil.h"
#include "otautil/cache_location.h"
#include "otautil/error_code.h"
#include "updater/blockimg.h"
#include "updater/install.h"
// Generated by the makefile, this function defines the
// RegisterDeviceExtensions() function, which calls all the
// registration functions for device-specific extensions.
#include "register.inc"
// Where in the package we expect to find the edify script to execute.
// (Note it's "updateR-script", not the older "update-script".)
static constexpr const char* SCRIPT_NAME = "META-INF/com/google/android/updater-script";
#define SELINUX_CONTEXTS_ZIP "file_contexts"
#define SELINUX_CONTEXTS_TMP "/tmp/file_contexts"
extern bool have_eio_error;
struct selabel_handle *sehandle;
static void UpdaterLogger(android::base::LogId /* id */, android::base::LogSeverity /* severity */,
const char* /* tag */, const char* /* file */, unsigned int /* line */,
const char* message) {
fprintf(stdout, "%s\n", message);
}
int main(int argc, char** argv) {
// Various things log information to stdout or stderr more or less
// at random (though we've tried to standardize on stdout). The
// log file makes more sense if buffering is turned off so things
// appear in the right order.
setbuf(stdout, nullptr);
setbuf(stderr, nullptr);
// We don't have logcat yet under recovery. Update logs will always be written to stdout
// (which is redirected to recovery.log).
android::base::InitLogging(argv, &UpdaterLogger);
if (argc != 4 && argc != 5) {
LOG(ERROR) << "unexpected number of arguments: " << argc;
return 1;
}
char* version = argv[1];
if ((version[0] != '1' && version[0] != '2' && version[0] != '3') || version[1] != '\0') {
// We support version 1, 2, or 3.
LOG(ERROR) << "wrong updater binary API; expected 1, 2, or 3; got " << argv[1];
return 2;
}
// Set up the pipe for sending commands back to the parent process.
int fd = atoi(argv[2]);
FILE* cmd_pipe = fdopen(fd, "wb");
setlinebuf(cmd_pipe);
// Extract the script from the package.
const char* package_filename = argv[3];
MemMapping map;
if (!map.MapFile(package_filename)) {
LOG(ERROR) << "failed to map package " << argv[3];
return 3;
}
ZipArchiveHandle za;
int open_err = OpenArchiveFromMemory(map.addr, map.length, argv[3], &za);
if (open_err != 0) {
LOG(ERROR) << "failed to open package " << argv[3] << ": " << ErrorCodeString(open_err);
CloseArchive(za);
return 3;
}
ZipString script_name(SCRIPT_NAME);
ZipEntry script_entry;
int find_err = FindEntry(za, script_name, &script_entry);
if (find_err != 0) {
LOG(ERROR) << "failed to find " << SCRIPT_NAME << " in " << package_filename << ": "
<< ErrorCodeString(find_err);
CloseArchive(za);
return 4;
}
std::string script;
script.resize(script_entry.uncompressed_length);
int extract_err = ExtractToMemory(za, &script_entry, reinterpret_cast<uint8_t*>(&script[0]),
script_entry.uncompressed_length);
if (extract_err != 0) {
LOG(ERROR) << "failed to read script from package: " << ErrorCodeString(extract_err);
CloseArchive(za);
return 5;
}
// Configure edify's functions.
RegisterBuiltins();
RegisterInstallFunctions();
RegisterBlockImageFunctions();
RegisterDeviceExtensions();
// Parse the script.
std::unique_ptr<Expr> root;
int error_count = 0;
int error = parse_string(script.c_str(), &root, &error_count);
if (error != 0 || error_count > 0) {
LOG(ERROR) << error_count << " parse errors";
CloseArchive(za);
return 6;
}
sehandle = selinux_android_file_context_handle();
selinux_android_set_sehandle(sehandle);
if (!sehandle) {
fprintf(cmd_pipe, "ui_print Warning: No file_contexts\n");
}
// Evaluate the parsed script.
UpdaterInfo updater_info;
updater_info.cmd_pipe = cmd_pipe;
updater_info.package_zip = za;
updater_info.version = atoi(version);
updater_info.package_zip_addr = map.addr;
updater_info.package_zip_len = map.length;
State state(script, &updater_info);
if (argc == 5) {
if (strcmp(argv[4], "retry") == 0) {
state.is_retry = true;
} else {
printf("unexpected argument: %s", argv[4]);
}
}
ota_io_init(za, state.is_retry);
if (access(SELINUX_CONTEXTS_TMP, R_OK) == 0) {
struct selinux_opt seopts[] = {
{ SELABEL_OPT_PATH, SELINUX_CONTEXTS_TMP }
};
sehandle = selabel_open(SELABEL_CTX_FILE, seopts, 1);
} else {
struct selinux_opt seopts[] = {
{ SELABEL_OPT_PATH, "/file_contexts" }
};
sehandle = selabel_open(SELABEL_CTX_FILE, seopts, 1);
}
std::string result;
bool status = Evaluate(&state, root, &result);
if (have_eio_error) {
fprintf(cmd_pipe, "retry_update\n");
}
if (!status) {
if (state.errmsg.empty()) {
LOG(ERROR) << "script aborted (no error message)";
fprintf(cmd_pipe, "ui_print script aborted (no error message)\n");
} else {
LOG(ERROR) << "script aborted: " << state.errmsg;
const std::vector<std::string> lines = android::base::Split(state.errmsg, "\n");
for (const std::string& line : lines) {
// Parse the error code in abort message.
// Example: "E30: This package is for bullhead devices."
if (!line.empty() && line[0] == 'E') {
if (sscanf(line.c_str(), "E%d: ", &state.error_code) != 1) {
LOG(ERROR) << "Failed to parse error code: [" << line << "]";
}
}
fprintf(cmd_pipe, "ui_print %s\n", line.c_str());
}
}
// Installation has been aborted. Set the error code to kScriptExecutionFailure unless
// a more specific code has been set in errmsg.
if (state.error_code == kNoError) {
state.error_code = kScriptExecutionFailure;
}
fprintf(cmd_pipe, "log error: %d\n", state.error_code);
// Cause code should provide additional information about the abort.
if (state.cause_code != kNoCause) {
fprintf(cmd_pipe, "log cause: %d\n", state.cause_code);
if (state.cause_code == kPatchApplicationFailure) {
LOG(INFO) << "Patch application failed, retry update.";
fprintf(cmd_pipe, "retry_update\n");
}
}
if (updater_info.package_zip) {
CloseArchive(updater_info.package_zip);
}
return 7;
} else {
fprintf(cmd_pipe, "ui_print script succeeded: result was [%s]\n", result.c_str());
}
if (updater_info.package_zip) {
CloseArchive(updater_info.package_zip);
}
return 0;
}
