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boot config: add libxbc usage examples

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cfig 4 years ago
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aosp/libxbc/libxbc.c
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/*
* Copyright (C) 2021 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 "libxbc.h"
#define BOOTCONFIG_MAGIC "#BOOTCONFIG\n"
#define BOOTCONFIG_MAGIC_SIZE 12
#define BOOTCONFIG_SIZE_SIZE 4
#define BOOTCONFIG_CHECKSUM_SIZE 4
#define BOOTCONFIG_TRAILER_SIZE BOOTCONFIG_MAGIC_SIZE + \
BOOTCONFIG_SIZE_SIZE + \
BOOTCONFIG_CHECKSUM_SIZE
/*
* Simple checksum for a buffer.
*
* @param addr pointer to the start of the buffer.
* @param size size of the buffer in bytes.
* @return check sum result.
*/
static uint32_t checksum(const unsigned char* const buffer, uint32_t size) {
uint32_t sum = 0;
for (uint32_t i = 0; i < size; i++) {
sum += buffer[i];
}
return sum;
}
/*
* Check if the bootconfig trailer is present within the bootconfig section.
*
* @param bootconfig_end_addr address of the end of the bootconfig section. If
* the trailer is present, it will be directly preceding this address.
* @return true if the trailer is present, false if not.
*/
static bool isTrailerPresent(uint64_t bootconfig_end_addr) {
return !strncmp((char*)(bootconfig_end_addr - BOOTCONFIG_MAGIC_SIZE),
BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_SIZE);
}
/*
* Add a string of boot config parameters to memory appended by the trailer.
*/
int32_t addBootConfigParameters(char* params, uint32_t params_size,
uint64_t bootconfig_start_addr, uint32_t bootconfig_size) {
if (!params || !bootconfig_start_addr) {
return -1;
}
if (params_size == 0) {
return 0;
}
int32_t applied_bytes = 0;
int32_t new_size = 0;
uint64_t end = bootconfig_start_addr + bootconfig_size;
if (isTrailerPresent(end)) {
end -= BOOTCONFIG_TRAILER_SIZE;
applied_bytes -= BOOTCONFIG_TRAILER_SIZE;
memcpy(&new_size, (void *)end, BOOTCONFIG_SIZE_SIZE);
} else {
new_size = bootconfig_size;
}
// params
memcpy((void*)end, params, params_size);
applied_bytes += params_size;
applied_bytes += addBootConfigTrailer(bootconfig_start_addr,
bootconfig_size + applied_bytes);
return applied_bytes;
}
/*
* Add boot config trailer.
*/
int32_t addBootConfigTrailer(uint64_t bootconfig_start_addr,
uint32_t bootconfig_size) {
if (!bootconfig_start_addr) {
return -1;
}
if (bootconfig_size == 0) {
return 0;
}
uint64_t end = bootconfig_start_addr + bootconfig_size;
if (isTrailerPresent(end)) {
// no need to overwrite the current trailers
return 0;
}
// size
memcpy((void *)(end), &bootconfig_size, BOOTCONFIG_SIZE_SIZE);
// checksum
uint32_t sum =
checksum((unsigned char*)bootconfig_start_addr, bootconfig_size);
memcpy((void *)(end + BOOTCONFIG_SIZE_SIZE), &sum,
BOOTCONFIG_CHECKSUM_SIZE);
// magic
memcpy((void *)(end + BOOTCONFIG_SIZE_SIZE + BOOTCONFIG_CHECKSUM_SIZE),
BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_SIZE);
return BOOTCONFIG_TRAILER_SIZE;
}

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aosp/libxbc/libxbc.h
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/*
* Copyright (C) 2021 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.
*/
#ifndef LIBXBC_H_
#define LIBXBC_H_
#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
// memcpy and strncmp
//#include <common.h>
/*
* Add a string of boot config parameters to memory appended by the trailer.
* This memory needs to be immediately following the end of the ramdisks.
* The new boot config trailer will be written to the end of the entire
* parameter section(previous + new). The trailer contains a 4 byte size of the
* parameters, followed by a 4 byte checksum of the parameters, followed by a 12
* byte magic string.
*
* @param params pointer to string of boot config parameters
* @param params_size size of params string in bytes
* @param bootconfig_start_addr address that the boot config section is starting
* at in memory.
* @param bootconfig_size size of the current bootconfig section in bytes.
* @return number of bytes added to the boot config section. -1 for error.
*/
int addBootConfigParameters(char *params, uint32_t params_size,
uint64_t bootconfig_start_addr,
uint32_t bootconfig_size);
/*
* Add the boot config trailer to the end of the boot config parameter section.
* This can be used after the vendor bootconfig section has been placed into
* memory if there are no additional parameters that need to be added.
* The new boot config trailer will be written to the end of the entire
* parameter section at (bootconfig_start_addr + bootconfig_size).
* The trailer contains a 4 byte size of the parameters, followed by a 4 byte
* checksum of the parameters, followed by a 12 byte magic string.
*
* @param bootconfig_start_addr address that the boot config section is starting
* at in memory.
* @param bootconfig_size size of the current bootconfig section in bytes.
* @return number of bytes added to the boot config section. -1 for error.
*/
int addBootConfigTrailer(uint64_t bootconfig_start_addr,
uint32_t bootconfig_size);
#ifdef __cplusplus
}
#endif
#endif /* LIBXBC_H_ */

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aosp/libxbc/main.cpp
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#include <fcntl.h>
#include <libxbc.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
static_assert(sizeof(uint64_t) == 8, "uint64_t 8 bytes");
static_assert(sizeof(void*) == 8, "void* 8 bytes");
void dumpBuf(void* buf, size_t bufSize, const char* outFile) {
int flags = O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC;
printf("dumping buffer to %s...\n", outFile);
auto fd = open(outFile, flags, 0644);
if (fd == -1) {
printf("fail to open file %s(%s)\n", outFile, strerror(errno));
exit(1);
}
size_t bytesWrite = write(fd, (char*)buf, bufSize);
if (bytesWrite != bufSize) {
printf("write failed. exp=%zu, act=%ld\n", bufSize, bytesWrite);
exit(2);
}
close(fd);
}
int main(int, char**) {
size_t bufSize = 256;
uint64_t buf = reinterpret_cast<uint64_t>(malloc(bufSize));
uint32_t bootConfigSize = 0;
if (!buf) {
printf("malloc failed\n");
exit(1);
}
{ // param1
char* ANDROID_BOOT_PARAM = (char*)"androidboot.xx=yy\n";
auto ret = addBootConfigParameters(ANDROID_BOOT_PARAM, strlen(ANDROID_BOOT_PARAM), buf,
bootConfigSize);
if (ret <= 0) {
printf("fail to apply boot config params\n");
exit(1);
} else {
printf("addBootConfigParameters() ret = %d\n", ret);
bootConfigSize += ret;
}
dumpBuf((void*)buf, bufSize, "tmp.1");
}
{ // param2
char* param2 = (char*)"k1=v1\nk2=v2\nk3=v3\n";
auto ret = addBootConfigParameters(param2, strlen(param2), buf, bootConfigSize);
if (ret <= 0) {
printf("fail to apply boot config param2\n");
exit(1);
} else {
printf("addBootConfigParameters() ret = %d\n", ret);
bootConfigSize += ret;
}
dumpBuf((void*)buf, bufSize, "tmp.2");
}
{ // param3
char* param3 =
(char*)"vendorboot_k1=vendorboot_v1\nvendorboot_k2=vendorboot_v2\nvendorboot_k3="
"vendorboot_v3\n";
auto ret = addBootConfigParameters(param3, strlen(param3), buf, bootConfigSize);
if (ret <= 0) {
printf("fail to apply boot config param3\n");
exit(1);
} else {
printf("addBootConfigParameters() ret = %d\n", ret);
bootConfigSize += ret;
}
dumpBuf((void*)buf, bufSize, "tmp.3");
}
free((void*)buf);
return 0;
}

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aosp/libxbc/meson.build
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project('libxbc', 'c', 'cpp',
version : '0.1',
default_options : ['warning_level=3'])
executable('xbc',
'libxbc.c',
'main.cpp',
install : true)

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