/*
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* Copyright (C) 2008 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 "../bootloader.h"
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#include "stdlib.h"
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#include <stdint.h>
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#include <fcntl.h>
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extern "C" {
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#include "../mtdutils/mtdutils.h"
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}
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#include "rktools.h"
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#include "log.h"
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/reboot.h>
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static char custom_cmdline_path[] = "/tmp/custom_cmdline";
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// ------------------------------------
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// for misc partitions on block devices
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// ------------------------------------
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static void wait_for_device(const char* fn) {
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int tries = 0;
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int ret;
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struct stat buf;
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do {
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++tries;
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ret = stat(fn, &buf);
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if (ret) {
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printf("stat %s try %d: %s\n", fn, tries, strerror(errno));
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sleep(1);
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}
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} while (ret && tries < 10);
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if (ret) {
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printf("failed to stat %s\n", fn);
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}
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}
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static unsigned int iavb_crc32_tab[] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
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0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
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0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
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0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
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0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
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0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
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0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
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0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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/* Converts a 32-bit unsigned integer from host to big-endian byte order. */
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static unsigned int avb_htobe32(unsigned int in) {
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union {
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unsigned int word;
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unsigned char bytes[4];
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} ret;
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ret.bytes[0] = (in >> 24) & 0xff;
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ret.bytes[1] = (in >> 16) & 0xff;
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ret.bytes[2] = (in >> 8) & 0xff;
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ret.bytes[3] = in & 0xff;
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return ret.word;
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}
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/*
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* A function that calculates the CRC-32 based on the table above is
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* given below for documentation purposes. An equivalent implementation
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* of this function that's actually used in the kernel can be found
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* in sys/libkern.h, where it can be inlined.
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*/
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static unsigned int iavb_crc32(unsigned int crc_in, const unsigned char* buf, int size) {
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const unsigned char* p = buf;
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unsigned int crc;
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crc = crc_in ^ ~0U;
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while (size--)
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crc = iavb_crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
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return crc ^ ~0U;
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}
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static unsigned int avb_crc32(const unsigned char* buf, size_t size) {
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return iavb_crc32(0, buf, size);
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}
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static void AvbABData_update_crc(struct AvbABData *data)
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{
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data->crc32 = avb_htobe32(avb_crc32((const unsigned char*)data, sizeof(struct AvbABData) - sizeof(unsigned int)));
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}
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static int writeMisc_mtd(char *buf, int offset, int size) {
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size_t page_size = 0;
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mtd_scan_partitions();
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const MtdPartition *part = mtd_find_partition_by_name(MISC_PARTITION_NAME_MTD);
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if (part == NULL || mtd_partition_info(part, NULL, NULL, &page_size)) {
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LOGE("Can't find %s\n", MISC_PARTITION_NAME_MTD);
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return -1;
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}
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MtdReadContext *read = mtd_read_partition(part);
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if (read == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_PARTITION_NAME_MTD, strerror(errno));
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return -1;
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}
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size_t write_size = page_size * 10; //读取20个页，24k
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char data[write_size];
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ssize_t r = mtd_read_data(read, data, write_size);
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if (r != write_size) LOGE("Can't read %s\n(%s)\n", MISC_PARTITION_NAME_MTD, strerror(errno));
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mtd_read_close(read);
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if (r != write_size) return -1;
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memcpy(&data[offset], buf, size);
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MtdWriteContext *write = mtd_write_partition(part);
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if (write == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_PARTITION_NAME_MTD, strerror(errno));
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return -1;
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}
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if (mtd_write_data(write, data, write_size) != write_size) {
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LOGE("Can't write %s\n(%s)\n", MISC_PARTITION_NAME_MTD, strerror(errno));
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mtd_write_close(write);
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return -1;
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}
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if (mtd_write_close(write)) {
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LOGE("Can't finish %s\n(%s)\n", MISC_PARTITION_NAME_MTD, strerror(errno));
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return -1;
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}
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return 0;
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}
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static int readMisc_mtd(char *buf, int offset, int size) {
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size_t page_size;
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memset(buf, 0, size);
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mtd_scan_partitions();
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const MtdPartition *part = mtd_find_partition_by_name(MISC_PARTITION_NAME_MTD);
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if (part == NULL || mtd_partition_info(part, NULL, NULL, &page_size)) {
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LOGE("Can't find %s\n", MISC_PARTITION_NAME_MTD);
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return -1;
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}
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MtdReadContext *read = mtd_read_partition(part);
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if (read == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_PARTITION_NAME_MTD, strerror(errno));
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return -1;
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}
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size_t write_size = page_size * 10; //读取20个页，24k
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char data[write_size];
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ssize_t r = mtd_read_data(read, data, write_size);
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if (r != write_size) LOGE("Can't read %s\n(%s)\n", MISC_PARTITION_NAME_MTD, strerror(errno));
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mtd_read_close(read);
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if (r != write_size) return -1;
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memcpy(buf, &data[offset], size);
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return 0;
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}
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static int writeMisc_block(char *buf, int offset, int size) {
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FILE* f = fopen(MISC_PARTITION_NAME_BLOCK, "wb");
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if (f == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
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}
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fseek(f, offset, SEEK_SET);
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int count = fwrite(buf, sizeof(char), size, f);
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if (count != size) {
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LOGE("Failed writing %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
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}
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if (fclose(f) != 0) {
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LOGE("Failed closing %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
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}
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return 0;
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}
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static int readMisc_block(char *buf, int offset, int size) {
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wait_for_device(MISC_PARTITION_NAME_BLOCK);
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FILE* f = fopen(MISC_PARTITION_NAME_BLOCK, "rb");
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if (f == NULL) {
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LOGE("Can't open %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
|
return -1;
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}
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|
fseek(f, offset, SEEK_SET);
|
|
int count = fread(buf, sizeof(char), size, f);
|
if (count != size) {
|
LOGE("Failed reading %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
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return -1;
|
}
|
if (fclose(f) != 0) {
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LOGE("Failed closing %s\n(%s)\n", MISC_PARTITION_NAME_BLOCK, strerror(errno));
|
return -1;
|
}
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return 0;
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|
}
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static int writeMisc(char *buf, int offset, int size) {
|
if (isMtdDevice()) {
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return writeMisc_mtd(buf, offset, size);
|
} else {
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return writeMisc_block(buf, offset, size);
|
}
|
}
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static int readMisc(char *buf, int offset, int size) {
|
if (isMtdDevice()) {
|
return readMisc_mtd(buf, offset, size);
|
} else {
|
return readMisc_block(buf, offset, size);
|
}
|
}
|
|
/**
|
* 往misc 偏移4k处写入格式化命令
|
*/
|
static int writeCmdMisc(char *cmdline, int size) {
|
return writeMisc(cmdline, MISC_OFFSET_CMDLINE, strlen(cmdline));
|
}
|
|
/**
|
* 读misc 偏移4K处格式化命令
|
*/
|
static int readCmdMisc(char *cmdline, int size) {
|
return readMisc(cmdline, MISC_OFFSET_CMDLINE, size);
|
}
|
|
/**
|
* 从misc 偏移2k处读取引导信息
|
*/
|
static int readABMisc(struct AvbABData* info) {
|
return readMisc((char *)info, MISC_OFFSET, sizeof(struct AvbABData));
|
}
|
|
/**
|
* 往misc 偏移2k处写入引导信息
|
*/
|
static int writeABMisc(struct AvbABData *info) {
|
return writeMisc((char *)info, MISC_OFFSET, sizeof(struct AvbABData));
|
}
|
|
/**
|
* 往misc 偏移16k位置处读取recovery信息
|
*/
|
int get_bootloader_message(struct bootloader_message *out) {
|
return readMisc((char *)out, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, sizeof(struct bootloader_message));
|
}
|
|
/**
|
* 往misc 偏移16k位置写入recovery信息
|
*/
|
|
int set_bootloader_message(const struct bootloader_message *in){
|
return writeMisc((char*)in, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, sizeof(struct bootloader_message));
|
}
|
|
int avb_safe_memcmp(const void* s1, const void* s2, size_t n) {
|
const unsigned char* us1 = (const unsigned char *)s1;
|
const unsigned char* us2 = (const unsigned char *)s2;
|
int result = 0;
|
|
if (0 == n) {
|
return 0;
|
}
|
|
/*
|
* Code snippet without data-dependent branch due to Nate Lawson
|
* (nate@root.org) of Root Labs.
|
*/
|
while (n--) {
|
result |= *us1++ ^ *us2++;
|
}
|
|
return result != 0;
|
}
|
/**
|
* 设置当前分区为可启动分区
|
*/
|
int setSlotSucceed() {
|
int now_slot = getCurrentSlot();
|
if (now_slot == -1) {
|
return -1;
|
}
|
struct AvbABData info;
|
if (readABMisc(&info) == -1) {
|
return -1;
|
}
|
|
for (size_t i = 0; i < 4; i++)
|
{
|
printf("info.mafic is %x\n",info.magic[i]);
|
}
|
if (avb_safe_memcmp(info.magic, AVB_AB_MAGIC, AVB_AB_MAGIC_LEN) != 0) {
|
printf("Magic is incorrect.\n");
|
return false;
|
}
|
if (info.slots[now_slot].priority != AVB_AB_MAX_PRIORITY) {
|
/* Something could be wrong, correct it because this slot is bootable */
|
printf("Warning: current slot priorty is %d != %d, Correct it!\n",
|
info.slots[now_slot].priority, AVB_AB_MAX_PRIORITY);
|
info.slots[now_slot].priority = AVB_AB_MAX_PRIORITY;
|
}
|
#ifdef SUCCESSFUL_BOOT
|
info.slots[now_slot].tries_remaining = 0;
|
info.slots[now_slot].successful_boot = 1;
|
#endif
|
#ifdef RETRY_BOOT
|
info.slots[now_slot].tries_remaining = AVB_AB_MAX_TRIES_REMAINING;
|
/* Clear suc boot flag anyway. Because it's chance that an older slot
|
* used succ mode without this patch applied, while the other one
|
* (new OTA slot) uses tries mode. We need to make sure not to confuse
|
* u-boot, otherwise this slot will be unbootable.
|
*/
|
info.slots[now_slot].successful_boot = 0;
|
#endif
|
info.last_boot = now_slot;
|
|
AvbABData_update_crc(&info);
|
|
if (writeABMisc(&info) != 0) {
|
return -1;
|
}
|
return 0;
|
}
|
|
/**
|
* 设置升级分区, 即另外一个分区优先级最高
|
*/
|
int setSlotActivity() {
|
int now_slot = getCurrentSlot();
|
if (now_slot == -1) {
|
return -1;
|
}
|
struct AvbABData info;
|
|
if (readABMisc(&info) == -1) {
|
return -1;
|
}
|
|
info.slots[now_slot].priority = AVB_AB_MAX_PRIORITY - 1;
|
info.slots[1 - now_slot].priority = AVB_AB_MAX_PRIORITY;
|
info.slots[1 - now_slot].tries_remaining = AVB_AB_MAX_TRIES_REMAINING;
|
/* When switch to another slot, assume it is not suc boot, try it out! */
|
info.slots[1 - now_slot].successful_boot = 0;
|
|
AvbABData_update_crc(&info);
|
|
if (writeABMisc(&info) != 0) {
|
return -1;
|
}
|
return 0;
|
}
|
|
|
|
/**
|
*格式化userdata_data
|
*/
|
int wipe_userdata(int auto_reboot) {
|
if (writeCmdMisc((char *)CMD_WIPE_USERDATA, sizeof(CMD_WIPE_USERDATA)) != 0) {
|
return -1;
|
}
|
|
if (auto_reboot) {
|
LOGI("auto reboot, %s.\n", CMD_WIPE_USERDATA);
|
sleep(1);
|
reboot(RB_AUTOBOOT);
|
}
|
return 0;
|
}
|
|
/* CustomCmdline struct = len + data */
|
static int writeCustomMisc(char *cmdline, int size) {
|
return writeMisc(cmdline, MISC_OFFSET_CUSTOM, size);
|
}
|
|
static int readCustomMisc(char *cmdline, int size) {
|
return readMisc(cmdline, MISC_OFFSET_CUSTOM, size);
|
}
|
|
int readCustomMiscCmdline(void)
|
{
|
uint16_t len;
|
uint8_t *buf;
|
int fd, ret = 0;
|
|
fd = open(custom_cmdline_path, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
|
if (fd == -1) {
|
LOGE("ERROR: Can't open %s\n", custom_cmdline_path);
|
return -1;
|
}
|
|
readCustomMisc((char *)&len, 2);
|
if (len > 1022) {
|
LOGE("ERROR: cmdline is too bigger than 1K (%d)\n", len);
|
ret = -1;
|
goto out;
|
}
|
|
if (!len) {
|
LOGE("ERROR: len is 0\n");
|
ret = -1;
|
goto out;
|
}
|
|
buf = (uint8_t *)malloc(len + 2);
|
if (!buf) {
|
LOGE("ERROR: failed to malloc buf for cmdline\n");
|
ret = -1;
|
goto out;
|
}
|
|
readCustomMisc((char *)buf, len + 2);
|
|
ftruncate(fd, 0);
|
lseek(fd, 0, SEEK_SET);
|
ret = write(fd, &buf[2], len);
|
if (ret == len) {
|
ret = 0;
|
} else {
|
LOGE("ERROR: failed to write %s (%d)\n", custom_cmdline_path, ret);
|
ret = -1;
|
}
|
|
free(buf);
|
out:
|
close(fd);
|
return ret;
|
}
|
|
int writeCustomMiscCmdline(void)
|
{
|
uint16_t len;
|
uint8_t *buf;
|
int fd, ret = 0;
|
|
fd = open(custom_cmdline_path, O_RDONLY);
|
if (fd == -1) {
|
LOGE("ERROR: Can't open %s\n", custom_cmdline_path);
|
return -1;
|
}
|
|
lseek(fd, 0, SEEK_SET);
|
ret = read(fd, (uint8_t *)&len, 2);
|
if (ret != 2) {
|
printf("ERROR: failed to read %s\n", custom_cmdline_path);
|
ret = -1;
|
goto out;
|
}
|
|
printf("len = %d\n", len);
|
buf = (uint8_t *)malloc(len + 2);
|
if (!buf) {
|
LOGE("ERROR: failed to malloc buf for cmdline\n");
|
ret = -1;
|
goto out;
|
}
|
|
memcpy(buf, &len, 2);
|
ret = read(fd, &buf[2], len);
|
if (ret == len) {
|
ret = 0;
|
} else {
|
LOGE("ERROR: failed to read %s\n", custom_cmdline_path);
|
ret = -1;
|
goto out1;
|
}
|
|
writeCustomMisc((char *)buf, len + 2);
|
out1:
|
free(buf);
|
out:
|
close(fd);
|
return ret;
|
}
|
|
int cleanCustomMiscCmdline(void)
|
{
|
uint8_t buf[1024];
|
|
memset(buf, 0, 1024);
|
return writeCustomMisc((char *)buf, 1024);
|
}
|
|
/*
|
* 显示MISC 分区的所有内容，方便调试
|
*/
|
void miscDisplay() {
|
// 显示A/B 分区的misc 信息
|
LOGI("===============Linux A/B=============\n");
|
struct AvbABData info_ab;
|
readABMisc(&info_ab);
|
LOGI("magic : %s.\n", info_ab.magic);
|
LOGI("version_major = %d.\n", info_ab.version_major);
|
LOGI("version_minor = %d.\n", info_ab.version_minor);
|
for (int i = 0; i < 2; i++) {
|
LOGI("slot.[%d]->priority = %d.\n", i, info_ab.slots[i].priority);
|
LOGI("slot.[%d]->successful_boot = %d.\n", i, info_ab.slots[i].successful_boot);
|
LOGI("slot.[%d]->tries_remaining = %d.\n", i, info_ab.slots[i].tries_remaining);
|
}
|
|
LOGI("last_boot : %d.\n", info_ab.last_boot);
|
LOGI("calculate crc32: %x.\n", avb_htobe32(avb_crc32((const unsigned char*)&info_ab, sizeof(struct AvbABData) - sizeof(unsigned int))));
|
LOGI("local crc32: %x.\n", info_ab.crc32);
|
LOGI("sizeof(struct AvbABData) = %ld\n", sizeof(struct AvbABData));
|
|
// 显示格式化信息
|
LOGI("==============wipe================\n");
|
// 显示recovery 的misc 信息
|
char cmdline[20];
|
readCmdMisc(cmdline, sizeof(cmdline));
|
LOGI("cmdline = %s.\n", cmdline);
|
LOGI("==============recovery============\n");
|
|
bootloader_message boot;
|
get_bootloader_message(&boot);
|
LOGI("bootloader.command = %s.\n", boot.command);
|
LOGI("bootloader.recovery = %s.\n", boot.recovery);
|
LOGI("bootloader.status = %s.\n", boot.status);
|
LOGI("bootloader.needupdate = %x.\n", *((int *)boot.needupdate));
|
LOGI("bootloader.systemFlag = %s.\n", boot.systemFlag);
|
}
|
