3d177d055c
Make the mount and format functions take extra parameters describing the filesystem type and add support for mounting and formatting ext4 filesystems on EMMC. Change recovery to consistently use stdout for status messages instead of mixing stdout and stderr.
304 lines
9.1 KiB
C
304 lines
9.1 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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#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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// 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) {
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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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return INSTALL_CORRUPT;
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}
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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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LOGE("Can't make %s\n", binary);
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return 1;
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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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if (!ok) {
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LOGE("Can't copy %s\n", ASSUMED_UPDATE_BINARY_NAME);
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return 1;
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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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char** args = 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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args[2] = malloc(10);
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sprintf(args[2], "%d", pipefd[1]);
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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, 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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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_show_progress(fraction * (1-VERIFICATION_PROGRESS_FRACTION),
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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_set_progress(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 {
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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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handle_update_package(const char *path, ZipArchive *zip)
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{
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// Update should take the rest of the progress bar.
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ui_print("Installing update...\n");
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int result = try_update_binary(path, zip);
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register_package_root(NULL, NULL); // Unregister package root
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return result;
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}
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// Reads a file containing one or more public keys as produced by
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// DumpPublicKey: this is an RSAPublicKey struct as it would appear
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// as a C source literal, eg:
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//
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// "{64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}"
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//
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// (Note that the braces and commas in this example are actual
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// characters the parser expects to find in the file; the ellipses
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// indicate more numbers omitted from this example.)
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//
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// The file may contain multiple keys in this format, separated by
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// commas. The last key must not be followed by a comma.
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//
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// Returns NULL if the file failed to parse, or if it contain zero keys.
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static RSAPublicKey*
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load_keys(const char* filename, int* numKeys) {
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RSAPublicKey* out = NULL;
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*numKeys = 0;
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FILE* f = fopen(filename, "r");
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if (f == NULL) {
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LOGE("opening %s: %s\n", filename, strerror(errno));
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goto exit;
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}
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int i;
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bool done = false;
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while (!done) {
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++*numKeys;
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out = realloc(out, *numKeys * sizeof(RSAPublicKey));
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RSAPublicKey* key = out + (*numKeys - 1);
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if (fscanf(f, " { %i , 0x%x , { %u",
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&(key->len), &(key->n0inv), &(key->n[0])) != 3) {
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goto exit;
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}
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if (key->len != RSANUMWORDS) {
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LOGE("key length (%d) does not match expected size\n", key->len);
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goto exit;
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}
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for (i = 1; i < key->len; ++i) {
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if (fscanf(f, " , %u", &(key->n[i])) != 1) goto exit;
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}
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if (fscanf(f, " } , { %u", &(key->rr[0])) != 1) goto exit;
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for (i = 1; i < key->len; ++i) {
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if (fscanf(f, " , %u", &(key->rr[i])) != 1) goto exit;
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}
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fscanf(f, " } } ");
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// if the line ends in a comma, this file has more keys.
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switch (fgetc(f)) {
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case ',':
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// more keys to come.
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break;
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case EOF:
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done = true;
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break;
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default:
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LOGE("unexpected character between keys\n");
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goto exit;
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}
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}
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fclose(f);
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return out;
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exit:
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if (f) fclose(f);
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free(out);
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*numKeys = 0;
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return NULL;
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}
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int
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install_package(const char *root_path)
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{
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ui_set_background(BACKGROUND_ICON_INSTALLING);
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ui_print("Finding update package...\n");
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ui_show_indeterminate_progress();
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LOGI("Update location: %s\n", root_path);
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if (ensure_root_path_mounted(root_path) != 0) {
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LOGE("Can't mount %s\n", root_path);
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return INSTALL_CORRUPT;
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}
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char path[PATH_MAX] = "";
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if (translate_root_path(root_path, path, sizeof(path)) == NULL) {
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LOGE("Bad path %s\n", root_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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LOGI("Update file path: %s\n", path);
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int numKeys;
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RSAPublicKey* 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_show_progress(
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VERIFICATION_PROGRESS_FRACTION,
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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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int status = handle_update_package(path, &zip);
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mzCloseZipArchive(&zip);
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return status;
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}
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