355 lines
6.7 KiB
C
355 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Boot config tool for initrd image
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*/
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#include <stdio.h>
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#include <stdlib.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 <string.h>
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#include <errno.h>
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#include <linux/kernel.h>
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#include <linux/bootconfig.h>
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int pr_output = 1;
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static int xbc_show_array(struct xbc_node *node)
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{
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const char *val;
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int i = 0;
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xbc_array_for_each_value(node, val) {
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printf("\"%s\"%s", val, node->next ? ", " : ";\n");
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i++;
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}
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return i;
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}
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static void xbc_show_compact_tree(void)
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{
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struct xbc_node *node, *cnode;
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int depth = 0, i;
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node = xbc_root_node();
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while (node && xbc_node_is_key(node)) {
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for (i = 0; i < depth; i++)
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printf("\t");
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cnode = xbc_node_get_child(node);
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while (cnode && xbc_node_is_key(cnode) && !cnode->next) {
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printf("%s.", xbc_node_get_data(node));
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node = cnode;
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cnode = xbc_node_get_child(node);
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}
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if (cnode && xbc_node_is_key(cnode)) {
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printf("%s {\n", xbc_node_get_data(node));
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depth++;
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node = cnode;
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continue;
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} else if (cnode && xbc_node_is_value(cnode)) {
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printf("%s = ", xbc_node_get_data(node));
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if (cnode->next)
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xbc_show_array(cnode);
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else
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printf("\"%s\";\n", xbc_node_get_data(cnode));
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} else {
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printf("%s;\n", xbc_node_get_data(node));
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}
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if (node->next) {
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node = xbc_node_get_next(node);
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continue;
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}
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while (!node->next) {
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node = xbc_node_get_parent(node);
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if (!node)
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return;
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if (!xbc_node_get_child(node)->next)
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continue;
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depth--;
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for (i = 0; i < depth; i++)
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printf("\t");
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printf("}\n");
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}
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node = xbc_node_get_next(node);
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}
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}
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/* Simple real checksum */
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int checksum(unsigned char *buf, int len)
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{
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int i, sum = 0;
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for (i = 0; i < len; i++)
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sum += buf[i];
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return sum;
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}
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#define PAGE_SIZE 4096
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int load_xbc_fd(int fd, char **buf, int size)
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{
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int ret;
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*buf = malloc(size + 1);
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if (!*buf)
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return -ENOMEM;
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ret = read(fd, *buf, size);
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if (ret < 0)
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return -errno;
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(*buf)[size] = '\0';
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return ret;
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}
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/* Return the read size or -errno */
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int load_xbc_file(const char *path, char **buf)
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{
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struct stat stat;
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int fd, ret;
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fd = open(path, O_RDONLY);
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if (fd < 0)
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return -errno;
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ret = fstat(fd, &stat);
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if (ret < 0)
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return -errno;
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ret = load_xbc_fd(fd, buf, stat.st_size);
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close(fd);
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return ret;
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}
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int load_xbc_from_initrd(int fd, char **buf)
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{
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struct stat stat;
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int ret;
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u32 size = 0, csum = 0, rcsum;
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ret = fstat(fd, &stat);
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if (ret < 0)
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return -errno;
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if (stat.st_size < 8)
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return 0;
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if (lseek(fd, -8, SEEK_END) < 0) {
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printf("Failed to lseek: %d\n", -errno);
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return -errno;
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}
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if (read(fd, &size, sizeof(u32)) < 0)
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return -errno;
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if (read(fd, &csum, sizeof(u32)) < 0)
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return -errno;
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/* Wrong size, maybe no boot config here */
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if (stat.st_size < size + 8)
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return 0;
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if (lseek(fd, stat.st_size - 8 - size, SEEK_SET) < 0) {
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printf("Failed to lseek: %d\n", -errno);
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return -errno;
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}
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ret = load_xbc_fd(fd, buf, size);
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if (ret < 0)
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return ret;
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/* Wrong Checksum, maybe no boot config here */
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rcsum = checksum((unsigned char *)*buf, size);
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if (csum != rcsum) {
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printf("checksum error: %d != %d\n", csum, rcsum);
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return 0;
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}
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ret = xbc_init(*buf);
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/* Wrong data, maybe no boot config here */
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if (ret < 0)
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return 0;
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return size;
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}
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int show_xbc(const char *path)
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{
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int ret, fd;
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char *buf = NULL;
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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printf("Failed to open initrd %s: %d\n", path, fd);
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return -errno;
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}
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ret = load_xbc_from_initrd(fd, &buf);
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if (ret < 0)
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printf("Failed to load a boot config from initrd: %d\n", ret);
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else
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xbc_show_compact_tree();
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close(fd);
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free(buf);
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return ret;
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}
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int delete_xbc(const char *path)
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{
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struct stat stat;
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int ret = 0, fd, size;
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char *buf = NULL;
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fd = open(path, O_RDWR);
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if (fd < 0) {
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printf("Failed to open initrd %s: %d\n", path, fd);
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return -errno;
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}
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/*
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* Suppress error messages in xbc_init() because it can be just a
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* data which concidentally matches the size and checksum footer.
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*/
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pr_output = 0;
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size = load_xbc_from_initrd(fd, &buf);
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pr_output = 1;
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if (size < 0) {
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ret = size;
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printf("Failed to load a boot config from initrd: %d\n", ret);
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} else if (size > 0) {
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ret = fstat(fd, &stat);
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if (!ret)
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ret = ftruncate(fd, stat.st_size - size - 8);
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if (ret)
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ret = -errno;
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} /* Ignore if there is no boot config in initrd */
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close(fd);
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free(buf);
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return ret;
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}
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int apply_xbc(const char *path, const char *xbc_path)
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{
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u32 size, csum;
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char *buf, *data;
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int ret, fd;
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ret = load_xbc_file(xbc_path, &buf);
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if (ret < 0) {
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printf("Failed to load %s : %d\n", xbc_path, ret);
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return ret;
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}
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size = strlen(buf) + 1;
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csum = checksum((unsigned char *)buf, size);
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/* Prepare xbc_path data */
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data = malloc(size + 8);
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if (!data)
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return -ENOMEM;
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strcpy(data, buf);
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*(u32 *)(data + size) = size;
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*(u32 *)(data + size + 4) = csum;
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/* Check the data format */
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ret = xbc_init(buf);
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if (ret < 0) {
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printf("Failed to parse %s: %d\n", xbc_path, ret);
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free(data);
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free(buf);
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return ret;
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}
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printf("Apply %s to %s\n", xbc_path, path);
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printf("\tNumber of nodes: %d\n", ret);
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printf("\tSize: %u bytes\n", (unsigned int)size);
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printf("\tChecksum: %d\n", (unsigned int)csum);
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/* TODO: Check the options by schema */
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xbc_destroy_all();
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free(buf);
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/* Remove old boot config if exists */
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ret = delete_xbc(path);
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if (ret < 0) {
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printf("Failed to delete previous boot config: %d\n", ret);
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return ret;
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}
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/* Apply new one */
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fd = open(path, O_RDWR | O_APPEND);
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if (fd < 0) {
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printf("Failed to open %s: %d\n", path, fd);
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return fd;
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}
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/* TODO: Ensure the @path is initramfs/initrd image */
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ret = write(fd, data, size + 8);
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if (ret < 0) {
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printf("Failed to apply a boot config: %d\n", ret);
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return ret;
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}
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close(fd);
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free(data);
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return 0;
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}
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int usage(void)
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{
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printf("Usage: bootconfig [OPTIONS] <INITRD>\n"
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" Apply, delete or show boot config to initrd.\n"
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" Options:\n"
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" -a <config>: Apply boot config to initrd\n"
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" -d : Delete boot config file from initrd\n\n"
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" If no option is given, show current applied boot config.\n");
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return -1;
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}
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int main(int argc, char **argv)
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{
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char *path = NULL;
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char *apply = NULL;
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bool delete = false;
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int opt;
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while ((opt = getopt(argc, argv, "hda:")) != -1) {
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switch (opt) {
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case 'd':
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delete = true;
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break;
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case 'a':
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apply = optarg;
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break;
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case 'h':
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default:
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return usage();
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}
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}
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if (apply && delete) {
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printf("Error: You can not specify both -a and -d at once.\n");
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return usage();
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}
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if (optind >= argc) {
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printf("Error: No initrd is specified.\n");
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return usage();
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}
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path = argv[optind];
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if (apply)
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return apply_xbc(path, apply);
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else if (delete)
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return delete_xbc(path);
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return show_xbc(path);
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}
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