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/*
* (C) Copyright 2023 Stefano Babic, stefano.babic@swupdate.org
*
* SPDX-License-Identifier: GPL-2.0-only
*/
/*
* This uses the API of the libtegra-boot-tools library
* see info on https://github.com/OE4T/tegra-boot-tools
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include "generated/autoconf.h"
#include "util.h"
#include "dlfcn.h"
#include "bootloader.h"
/*
* thes edefines are not exported by the library
*/
#define BOOTINFO_O_RDONLY (0<<0)
#define BOOTINFO_O_RDWR (3<<0)
#define BOOTINFO_O_CREAT (1<<2)
#define BOOTINFO_O_FORCE_INIT (1<<3)
/*
* Define the API from bootinfo.h. File is not (yet ?)
* exported by the library, and they are defined here.
*/
struct bootinfo_context_s;
typedef struct bootinfo_context_s bootinfo_context_t;
extern int bootinfo_open(unsigned int flags, bootinfo_context_t **ctxp);
extern int bootinfo_close(bootinfo_context_t *ctx);
extern int bootinfo_var_get(bootinfo_context_t *ctx, const char *name, char *valuebuf, size_t valuebuf_size);
extern int bootinfo_var_set(bootinfo_context_t *ctx, const char *name, const char *value);
/*
* Structure for external library callbacks
*/
static struct {
int (*open)(unsigned int flags, bootinfo_context_t **ctxp);
int (*close)(bootinfo_context_t *ctx);
int (*get_env)(bootinfo_context_t *ctx, const char *name, char *valuebuf, size_t valuebuf_size);
int (*set_env)(bootinfo_context_t *ctx, const char *name, const char *value);
} libcboot;
static char *do_env_get(const char *name)
{
bootinfo_context_t *ctx;
static char valuebuf[65536];
char *value;
if (!name)
return NULL;
if (libcboot.open(BOOTINFO_O_RDONLY, &ctx) < 0) {
ERROR("libcboot.open returns with error");
return NULL;
}
if (libcboot.get_env(ctx, name, valuebuf, sizeof(valuebuf)) < 0)
valuebuf[0] = '\0';
value = strdup(valuebuf);
if (libcboot.close(ctx) < 0) {
ERROR("libcboot.close returns with error, environmen not saved");
}
return value;
}
static int do_env_set(const char *name, const char *value)
{
int ret = 0;
bootinfo_context_t *ctx;
if (!name || !value)
return -EINVAL;
if (libcboot.open(BOOTINFO_O_RDWR, &ctx) < 0) {
ERROR("libcboot.open returns with error");
return -ENOENT;
}
if (libcboot.set_env(ctx, name, value) < 0) {
ERROR("libcboot.set_env");
ret = -EFAULT;
}
if (libcboot.close(ctx) < 0) {
ERROR("libcboot.close returns with error, environment not saved");
ret = -EFAULT;
}
return ret;
}
static int do_env_unset(const char *name)
{
int ret = 0;
bootinfo_context_t *ctx;
if (!name)
return -EINVAL;
if (libcboot.open(BOOTINFO_O_RDWR, &ctx) < 0) {
ERROR("libcboot.open returns with error");
return -ENOENT;
}
if (libcboot.set_env(ctx, name, NULL) < 0) {
ERROR("libcboot.set_env for unset");
ret = -EFAULT;
}
if (libcboot.close(ctx) < 0) {
ERROR("libcboot.close returns with error, environment not saved");
ret = -EFAULT;
}
return ret;
}
static int do_apply_list(const char *filename)
{
errno = 0;
bootinfo_context_t *ctx;
FILE *file = fopen(filename, "rb");
if (!file) {
ERROR("Cannot open bootloader environment source file %s: %s",
filename, strerror(errno));
return -EIO;
}
char *line = NULL;
size_t length = 0;
int result = 0;
if (libcboot.open(BOOTINFO_O_RDWR, &ctx) < 0) {
ERROR("libcboot.open returns with error");
fclose(file);
return -ENOENT;
}
while ((getline(&line, &length, file)) != -1) {
char *key = strtok(line, "=");
char *value = strtok(NULL, "\t\n");
if (key != NULL) {
result = libcboot.set_env(ctx, key, value);
if (result < 0) {
ERROR("Error %s boot var %s(%s)", value ? "storing" : "deleting",
key, value ? value : "");
}
}
}
if (libcboot.close(ctx) < 0) {
ERROR("libcboot.close returns with error, environment not saved");
result = -EFAULT;
}
fclose(file);
free(line);
return result;
}
static bootloader cboot = {
.env_get = &do_env_get,
.env_set = &do_env_set,
.env_unset = &do_env_unset,
.apply_list = &do_apply_list
};
static bootloader* probe(void)
{
#if defined(BOOTLOADER_STATIC_LINKED)
libcboot.open = bootinfo_open;
libcboot.close = bootinfo_close;
libcboot.get_env = bootinfo_var_get;
libcboot.set_env = bootinfo_var_set;
#else
void* handle = dlopen("libtegra-boot-tools.so.1", RTLD_NOW | RTLD_GLOBAL);
if (!handle) {
return NULL;
}
(void)dlerror();
load_symbol(handle, &libcboot.open, "bootinfo_open");
load_symbol(handle, &libcboot.close, "bootinfo_close");
load_symbol(handle, &libcboot.get_env, "bootinfo_var_get");
load_symbol(handle, &libcboot.set_env, "bootinfo_var_set");
#endif
return &cboot;
}
__attribute__((constructor))
static void cboot_probe(void)
{
(void)register_bootloader(BOOTLOADER_CBOOT, probe());
}
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