platform_system_core/fastbootd/commands.c

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/*
* Copyright (c) 2009-2013, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google, Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/reboot.h>
#include <fcntl.h>
#include "bootimg.h"
#include "commands/boot.h"
#include "commands/flash.h"
#include "commands/partitions.h"
#include "commands/virtual_partitions.h"
#include "debug.h"
#include "protocol.h"
#include "trigger.h"
#include "utils.h"
#define ATAGS_LOCATION "/proc/atags"
static void cmd_boot(struct protocol_handle *phandle, const char *arg)
{
int sz, atags_sz, new_atags_sz;
int rv;
unsigned kernel_actual;
unsigned ramdisk_actual;
unsigned second_actual;
void *kernel_ptr;
void *ramdisk_ptr;
void *second_ptr;
struct boot_img_hdr *hdr;
char *ptr = NULL;
char *atags_ptr = NULL;
char *new_atags = NULL;
int data_fd = 0;
D(DEBUG, "cmd_boot %s\n", arg);
if (phandle->download_fd < 0) {
fastboot_fail(phandle, "no kernel file");
return;
}
atags_ptr = read_atags(ATAGS_LOCATION, &atags_sz);
if (atags_ptr == NULL) {
fastboot_fail(phandle, "atags read error");
goto error;
}
// TODO: With cms we can also verify partition name included as
// cms signed attribute
if (flash_validate_certificate(phandle->download_fd, &data_fd) != 1) {
fastboot_fail(phandle, "Access forbiden you need the certificate");
return;
}
sz = get_file_size(data_fd);
ptr = (char *) mmap(NULL, sz, PROT_READ,
MAP_POPULATE | MAP_PRIVATE, data_fd, 0);
hdr = (struct boot_img_hdr *) ptr;
if (ptr == MAP_FAILED) {
fastboot_fail(phandle, "internal fastbootd error");
goto error;
}
if ((size_t) sz < sizeof(*hdr)) {
fastboot_fail(phandle, "invalid bootimage header");
goto error;
}
kernel_actual = ROUND_TO_PAGE(hdr->kernel_size, hdr->page_size);
ramdisk_actual = ROUND_TO_PAGE(hdr->ramdisk_size, hdr->page_size);
second_actual = ROUND_TO_PAGE(hdr->second_size, hdr->page_size);
new_atags = (char *) create_atags((unsigned *) atags_ptr, atags_sz, hdr, &new_atags_sz);
if (new_atags == NULL) {
fastboot_fail(phandle, "atags generate error");
goto error;
}
if (new_atags_sz > 0x4000) {
fastboot_fail(phandle, "atags file to large");
goto error;
}
if ((int) (hdr->page_size + kernel_actual + ramdisk_actual) < sz) {
fastboot_fail(phandle, "incomplete bootimage");
goto error;
}
kernel_ptr = (void *)((unsigned) ptr + hdr->page_size);
ramdisk_ptr = (void *)((unsigned) kernel_ptr + kernel_actual);
second_ptr = (void *)((unsigned) ramdisk_ptr + ramdisk_actual);
D(INFO, "preparing to boot");
// Prepares boot physical addresses from header are ignored
rv = prepare_boot_linux(hdr->kernel_addr, kernel_ptr, kernel_actual,
hdr->ramdisk_addr, ramdisk_ptr, ramdisk_actual,
hdr->second_addr, second_ptr, second_actual,
hdr->tags_addr, new_atags, ROUND_TO_PAGE(new_atags_sz, hdr->page_size));
if (rv < 0) {
fastboot_fail(phandle, "kexec prepare failed");
goto error;
}
fastboot_okay(phandle, "");
free(atags_ptr);
munmap(ptr, sz);
free(new_atags);
close(data_fd);
D(INFO, "Kexec going to reboot");
reboot(LINUX_REBOOT_CMD_KEXEC);
fastboot_fail(phandle, "reboot error");
return;
error:
if (atags_ptr != NULL)
free(atags_ptr);
if (ptr != NULL)
munmap(ptr, sz);
}
static void cmd_erase(struct protocol_handle *phandle, const char *arg)
{
int partition_fd;
char path[PATH_MAX];
D(DEBUG, "cmd_erase %s\n", arg);
if (flash_find_entry(arg, path, PATH_MAX)) {
fastboot_fail(phandle, "partition table doesn't exist");
return;
}
if (path == NULL) {
fastboot_fail(phandle, "Couldn't find partition");
return;
}
partition_fd = flash_get_partiton(path);
if (partition_fd < 0) {
fastboot_fail(phandle, "partiton file does not exists");
}
if (flash_erase(partition_fd)) {
fastboot_fail(phandle, "failed to erase partition");
flash_close(partition_fd);
return;
}
if (flash_close(partition_fd) < 0) {
D(ERR, "could not close device %s", strerror(errno));
fastboot_fail(phandle, "failed to erase partition");
return;
}
fastboot_okay(phandle, "");
}
static int GPT_header_location() {
const char *location_str = fastboot_getvar("gpt_sector");
char *str;
int location;
if (!strcmp("", location_str)) {
D(INFO, "GPT location not specified using second sector");
return 1;
}
else {
location = strtoul(location_str, &str, 10);
D(INFO, "GPT location specified as %d", location);
if (*str != '\0')
return -1;
return location - 1;
}
}
static void cmd_gpt_layout(struct protocol_handle *phandle, const char *arg) {
struct GPT_entry_table *oldtable;
int location;
struct GPT_content content;
const char *device;
device = fastboot_getvar("blockdev");
if (!strcmp(device, "")) {
fastboot_fail(phandle, "blockdev not defined in config file");
return;
}
if (phandle->download_fd < 0) {
fastboot_fail(phandle, "no layout file");
return;
}
location = GPT_header_location();
oldtable = GPT_get_device(device, location);
GPT_default_content(&content, oldtable);
if (oldtable == NULL)
D(WARN, "Could not get old gpt table");
else
GPT_release_device(oldtable);
if (!GPT_parse_file(phandle->download_fd, &content)) {
fastboot_fail(phandle, "Could not parse partition config file");
return;
}
if (trigger_gpt_layout(&content)) {
fastboot_fail(phandle, "Vendor forbids this opperation");
GPT_release_content(&content);
return;
}
if (!GPT_write_content(device, &content)) {
fastboot_fail(phandle, "Unable to write gpt file");
GPT_release_content(&content);
return;
}
GPT_release_content(&content);
fastboot_okay(phandle, "");
}
static void cmd_flash(struct protocol_handle *phandle, const char *arg)
{
int partition;
uint64_t sz;
char data[BOOT_MAGIC_SIZE];
char path[PATH_MAX];
ssize_t header_sz = 0;
int data_fd = 0;
D(DEBUG, "cmd_flash %s\n", arg);
if (try_handle_virtual_partition(phandle, arg)) {
return;
}
if (phandle->download_fd < 0) {
fastboot_fail(phandle, "no kernel file");
return;
}
if (flash_find_entry(arg, path, PATH_MAX)) {
fastboot_fail(phandle, "partition table doesn't exist");
return;
}
if (flash_validate_certificate(phandle->download_fd, &data_fd) != 1) {
fastboot_fail(phandle, "Access forbiden you need certificate");
return;
}
// TODO: Maybe its goot idea to check whether the partition is just bootable partition
if (!strcmp(arg, "boot") || !strcmp(arg, "recovery")) {
if (read_data_once(data_fd, data, BOOT_MAGIC_SIZE) < BOOT_MAGIC_SIZE) {
fastboot_fail(phandle, "incoming data read error, cannot read boot header");
return;
}
if (memcmp((void *)data, BOOT_MAGIC, BOOT_MAGIC_SIZE)) {
fastboot_fail(phandle, "image is not a boot image");
return;
}
}
partition = flash_get_partiton(path);
sz = get_file_size64(data_fd);
sz -= header_sz;
if (sz > get_file_size64(partition)) {
flash_close(partition);
D(WARN, "size of file too large");
fastboot_fail(phandle, "size of file too large");
return;
}
D(INFO, "writing %lld bytes to '%s'\n", sz, arg);
if (flash_write(partition, phandle->download_fd, sz, header_sz)) {
fastboot_fail(phandle, "flash write failure");
return;
}
D(INFO, "partition '%s' updated\n", arg);
flash_close(partition);
close(data_fd);
//TODO: check who is closing phandle->download_fd
fastboot_okay(phandle, "");
}
static void cmd_continue(struct protocol_handle *phandle, const char *arg)
{
fastboot_okay(phandle, "");
#if 0
udc_stop();
boot_linux_from_flash();
#endif
}
static void cmd_getvar(struct protocol_handle *phandle, const char *arg)
{
const char *value;
D(DEBUG, "cmd_getvar %s\n", arg);
value = fastboot_getvar(arg);
fastboot_okay(phandle, value);
}
static void cmd_download(struct protocol_handle *phandle, const char *arg)
{
unsigned len = strtoul(arg, NULL, 16);
int old_fd;
if (len > 256 * 1024 * 1024) {
fastboot_fail(phandle, "data too large");
return;
}
fastboot_data(phandle, len);
old_fd = protocol_get_download(phandle);
if (old_fd >= 0) {
off_t len = lseek(old_fd, 0, SEEK_END);
D(INFO, "disposing of unused fd %d, size %ld", old_fd, len);
close(old_fd);
}
phandle->download_fd = protocol_handle_download(phandle, len);
if (phandle->download_fd < 0) {
//handle->state = STATE_ERROR;
fastboot_fail(phandle, "download failed");
return;
}
fastboot_okay(phandle, "");
}
static void cmd_oem(struct protocol_handle *phandle, const char *arg) {
const char *response = "";
if (trigger_oem_cmd(arg, &response))
fastboot_fail(phandle, response);
else
fastboot_okay(phandle, response);
}
void commands_init()
{
virtual_partition_register("partition-table", cmd_gpt_layout);
fastboot_register("boot", cmd_boot);
fastboot_register("erase:", cmd_erase);
fastboot_register("flash:", cmd_flash);
fastboot_register("continue", cmd_continue);
fastboot_register("getvar:", cmd_getvar);
fastboot_register("download:", cmd_download);
fastboot_register("oem", cmd_oem);
//fastboot_publish("version", "0.5");
//fastboot_publish("product", "swordfish");
//fastboot_publish("kernel", "lk");
}