246 lines
7.7 KiB
C++
246 lines
7.7 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "common.h"
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#include "install.h"
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#include "mincrypt/rsa.h"
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#include "minui/minui.h"
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#include "minzip/SysUtil.h"
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#include "minzip/Zip.h"
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#include "mtdutils/mounts.h"
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#include "mtdutils/mtdutils.h"
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#include "roots.h"
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#include "verifier.h"
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#include "ui.h"
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extern RecoveryUI* ui;
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#define ASSUMED_UPDATE_BINARY_NAME "META-INF/com/google/android/update-binary"
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#define PUBLIC_KEYS_FILE "/res/keys"
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// Default allocation of progress bar segments to operations
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static const int VERIFICATION_PROGRESS_TIME = 60;
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static const float VERIFICATION_PROGRESS_FRACTION = 0.25;
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static const float DEFAULT_FILES_PROGRESS_FRACTION = 0.4;
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static const float DEFAULT_IMAGE_PROGRESS_FRACTION = 0.1;
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// If the package contains an update binary, extract it and run it.
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static int
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try_update_binary(const char *path, ZipArchive *zip, int* wipe_cache) {
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const ZipEntry* binary_entry =
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mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME);
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if (binary_entry == NULL) {
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mzCloseZipArchive(zip);
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return INSTALL_CORRUPT;
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}
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const char* binary = "/tmp/update_binary";
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unlink(binary);
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int fd = creat(binary, 0755);
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if (fd < 0) {
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mzCloseZipArchive(zip);
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LOGE("Can't make %s\n", binary);
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return INSTALL_ERROR;
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}
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bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd);
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close(fd);
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mzCloseZipArchive(zip);
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if (!ok) {
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LOGE("Can't copy %s\n", ASSUMED_UPDATE_BINARY_NAME);
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return INSTALL_ERROR;
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}
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int pipefd[2];
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pipe(pipefd);
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// When executing the update binary contained in the package, the
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// arguments passed are:
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//
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// - the version number for this interface
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//
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// - an fd to which the program can write in order to update the
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// progress bar. The program can write single-line commands:
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//
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// progress <frac> <secs>
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// fill up the next <frac> part of of the progress bar
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// over <secs> seconds. If <secs> is zero, use
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// set_progress commands to manually control the
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// progress of this segment of the bar
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//
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// set_progress <frac>
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// <frac> should be between 0.0 and 1.0; sets the
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// progress bar within the segment defined by the most
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// recent progress command.
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//
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// firmware <"hboot"|"radio"> <filename>
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// arrange to install the contents of <filename> in the
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// given partition on reboot.
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//
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// (API v2: <filename> may start with "PACKAGE:" to
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// indicate taking a file from the OTA package.)
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//
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// (API v3: this command no longer exists.)
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//
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// ui_print <string>
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// display <string> on the screen.
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//
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// - the name of the package zip file.
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//
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const char** args = (const char**)malloc(sizeof(char*) * 5);
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args[0] = binary;
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args[1] = EXPAND(RECOVERY_API_VERSION); // defined in Android.mk
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char* temp = (char*)malloc(10);
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sprintf(temp, "%d", pipefd[1]);
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args[2] = temp;
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args[3] = (char*)path;
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args[4] = NULL;
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pid_t pid = fork();
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if (pid == 0) {
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close(pipefd[0]);
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execv(binary, (char* const*)args);
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fprintf(stdout, "E:Can't run %s (%s)\n", binary, strerror(errno));
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_exit(-1);
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}
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close(pipefd[1]);
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*wipe_cache = 0;
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char buffer[1024];
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FILE* from_child = fdopen(pipefd[0], "r");
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while (fgets(buffer, sizeof(buffer), from_child) != NULL) {
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char* command = strtok(buffer, " \n");
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if (command == NULL) {
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continue;
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} else if (strcmp(command, "progress") == 0) {
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char* fraction_s = strtok(NULL, " \n");
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char* seconds_s = strtok(NULL, " \n");
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float fraction = strtof(fraction_s, NULL);
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int seconds = strtol(seconds_s, NULL, 10);
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ui->ShowProgress(fraction * (1-VERIFICATION_PROGRESS_FRACTION), seconds);
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} else if (strcmp(command, "set_progress") == 0) {
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char* fraction_s = strtok(NULL, " \n");
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float fraction = strtof(fraction_s, NULL);
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ui->SetProgress(fraction);
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} else if (strcmp(command, "ui_print") == 0) {
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char* str = strtok(NULL, "\n");
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if (str) {
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ui->Print("%s", str);
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} else {
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ui->Print("\n");
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}
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} else if (strcmp(command, "wipe_cache") == 0) {
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*wipe_cache = 1;
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} else if (strcmp(command, "clear_display") == 0) {
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ui->SetBackground(RecoveryUI::NONE);
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} else {
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LOGE("unknown command [%s]\n", command);
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}
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}
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fclose(from_child);
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int status;
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waitpid(pid, &status, 0);
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
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LOGE("Error in %s\n(Status %d)\n", path, WEXITSTATUS(status));
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return INSTALL_ERROR;
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}
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return INSTALL_SUCCESS;
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}
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static int
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really_install_package(const char *path, int* wipe_cache)
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{
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ui->SetBackground(RecoveryUI::INSTALLING_UPDATE);
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ui->Print("Finding update package...\n");
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ui->SetProgressType(RecoveryUI::INDETERMINATE);
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LOGI("Update location: %s\n", path);
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if (ensure_path_mounted(path) != 0) {
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LOGE("Can't mount %s\n", path);
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return INSTALL_CORRUPT;
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}
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ui->Print("Opening update package...\n");
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int numKeys;
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Certificate* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
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if (loadedKeys == NULL) {
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LOGE("Failed to load keys\n");
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return INSTALL_CORRUPT;
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}
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LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE);
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// Give verification half the progress bar...
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ui->Print("Verifying update package...\n");
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ui->SetProgressType(RecoveryUI::DETERMINATE);
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ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME);
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int err;
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err = verify_file(path, loadedKeys, numKeys);
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free(loadedKeys);
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LOGI("verify_file returned %d\n", err);
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if (err != VERIFY_SUCCESS) {
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LOGE("signature verification failed\n");
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return INSTALL_CORRUPT;
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}
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/* Try to open the package.
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*/
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ZipArchive zip;
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err = mzOpenZipArchive(path, &zip);
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if (err != 0) {
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LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad");
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return INSTALL_CORRUPT;
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}
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/* Verify and install the contents of the package.
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*/
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ui->Print("Installing update...\n");
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return try_update_binary(path, &zip, wipe_cache);
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}
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int
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install_package(const char* path, int* wipe_cache, const char* install_file)
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{
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FILE* install_log = fopen_path(install_file, "w");
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if (install_log) {
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fputs(path, install_log);
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fputc('\n', install_log);
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} else {
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LOGE("failed to open last_install: %s\n", strerror(errno));
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}
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int result = really_install_package(path, wipe_cache);
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if (install_log) {
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fputc(result == INSTALL_SUCCESS ? '1' : '0', install_log);
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fputc('\n', install_log);
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fclose(install_log);
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}
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return result;
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}
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