+++ /dev/null
-/*
- * imagetag.c
- *
- * Copyright (C) 2005 Mike Baker
- * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
- * Copyrigth (C) 2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <string.h>
-#include <errno.h>
-
-#include <sys/ioctl.h>
-#include <mtd/mtd-user.h>
-#include <linux/bcm963xx_tag.h>
-
-#include "mtd.h"
-#include "crc32.h"
-
-ssize_t pread(int fd, void *buf, size_t count, off_t offset);
-ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
-
-#define CRC_START 0xFFFFFFFF
-
-static uint32_t strntoul(char *str, char **endptr, int base, size_t len) {
- char *newstr;
- uint32_t res = 0;
-
- newstr = calloc(len + 1, sizeof(char));
- if (newstr) {
- strncpy(newstr, str, len);
- res = strtoul(newstr, endptr, base);
- free(newstr);
- }
- return res;
-}
-
-uint32_t compute_crc32(uint32_t crc, off_t start, size_t compute_len, int fd)
-{
- uint8_t readbuf[1024];
- ssize_t res;
- off_t offset = start;
-
- /* Read a buffer's worth of bytes */
- while (fd && (compute_len >= sizeof(readbuf))) {
- res = pread(fd, readbuf, sizeof(readbuf), offset);
- crc = crc32(crc, readbuf, res);
- compute_len = compute_len - res;
- offset += res;
- }
-
- /* Less than buffer-size bytes remains, read compute_len bytes */
- if (fd && (compute_len > 0)) {
- res = pread(fd, readbuf, compute_len, offset);
- crc = crc32(crc, readbuf, res);
- }
-
- return crc;
-}
-
-int
-trx_fixup(int fd, const char *name)
-{
- struct mtd_info_user mtdInfo;
- unsigned long len;
- void *ptr, *scan;
- int bfd;
- struct bcm_tag *tag;
- ssize_t res;
- uint32_t cfelen, imagelen, imagestart, rootfslen;
- uint32_t imagecrc, rootfscrc, headercrc;
- uint32_t offset = 0;
- cfelen = imagelen = imagestart = imagecrc = rootfscrc = headercrc = rootfslen = 0;
-
-
- if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
- fprintf(stderr, "Failed to get mtd info\n");
- goto err;
- }
-
- len = mtdInfo.size;
- if (mtdInfo.size <= 0) {
- fprintf(stderr, "Invalid MTD device size\n");
- goto err;
- }
-
- bfd = mtd_open(name, true);
- ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
- if (!ptr || (ptr == (void *) -1)) {
- perror("mmap");
- goto err1;
- }
-
- tag = (struct bcm_tag *) (ptr);
-
- cfelen = strntoul(&tag->cfe_length[0], NULL, 10, IMAGE_LEN);
- if (cfelen) {
- fprintf(stderr, "Non-zero CFE length. This is currently unsupported.\n");
- exit(1);
- }
-
- headercrc = compute_crc32(CRC_START, offset, offsetof(struct bcm_tag, header_crc), fd);
- if (headercrc != *(uint32_t *)(&tag->header_crc)) {
- fprintf(stderr, "Tag verify failed. This may not be a valid image.\n");
- exit(1);
- }
-
- sprintf(&tag->root_length[0], "%u", 0);
- strncpy(&tag->total_length[0], &tag->kernel_length[0], IMAGE_LEN);
-
- imagestart = sizeof(tag);
- memcpy(&tag->image_crc, &tag->kernel_crc, sizeof(uint32_t));
- memcpy(&tag->fskernel_crc, &tag->kernel_crc, sizeof(uint32_t));
- rootfscrc = CRC_START;
- memcpy(&tag->rootfs_crc, &rootfscrc, sizeof(uint32_t));
- headercrc = crc32(CRC_START, tag, offsetof(struct bcm_tag, header_crc));
- memcpy(&tag->header_crc, &headercrc, sizeof(uint32_t));
-
- msync(ptr, sizeof(struct bcm_tag), MS_SYNC|MS_INVALIDATE);
- munmap(ptr, len);
- close(bfd);
- return 0;
-
-err1:
- close(bfd);
-err:
- fprintf(stderr, "Error fixing up imagetag header\n");
- return -1;
-}
-
-
-int
-trx_check(int imagefd, const char *mtd, char *buf, int *len)
-{
- struct bcm_tag *tag = (const struct bcm_tag *) buf;
- int fd;
- uint32_t headerCRC;
- uint32_t imageLen;
-
- if (strcmp(mtd, "linux") != 0)
- return 1;
-
- *len = read(imagefd, buf, sizeof(struct bcm_tag));
- if (*len < sizeof(struct bcm_tag)) {
- fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
- return 0;
- }
- headerCRC = crc32buf(buf, offsetof(struct bcm_tag, header_crc));
- if (*(uint32_t *)(&tag->header_crc) != headerCRC) {
-
- if (quiet < 2) {
- fprintf(stderr, "Bad header CRC got %08x, calculated %08x\n",
- *(uint32_t *)(&tag->header_crc), headerCRC);
- fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
- "Please specify the correct file or use -f to force.\n");
- }
- return 0;
- }
-
- /* check if image fits to mtd device */
- fd = mtd_check_open(mtd);
- if(fd < 0) {
- fprintf(stderr, "Could not open mtd device: %s\n", mtd);
- exit(1);
- }
-
- imageLen = strntoul(&tag->total_length[0], NULL, 10, IMAGE_LEN);
-
- if(mtdsize < imageLen) {
- fprintf(stderr, "Image too big for partition: %s\n", mtd);
- close(fd);
- return 0;
- }
-
- close(fd);
- return 1;
-}
-
-int
-mtd_fixtrx(const char *mtd, size_t offset)
-{
- int fd;
- struct bcm_tag *tag;
- char *buf;
- ssize_t res;
- size_t block_offset;
- uint32_t cfelen, imagelen, imagestart, rootfslen;
- uint32_t imagecrc, rootfscrc, headercrc;
- cfelen = imagelen = imagestart = imagecrc = rootfscrc = headercrc = rootfslen = 0;
-
- if (quiet < 2)
- fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
-
- block_offset = offset & ~(erasesize - 1);
- offset -= block_offset;
-
- fd = mtd_check_open(mtd);
- if(fd < 0) {
- fprintf(stderr, "Could not open mtd device: %s\n", mtd);
- exit(1);
- }
-
- if (block_offset + erasesize > mtdsize) {
- fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
- exit(1);
- }
-
- buf = malloc(erasesize);
- if (!buf) {
- perror("malloc");
- exit(1);
- }
-
- res = pread(fd, buf, erasesize, block_offset);
- if (res != erasesize) {
- perror("pread");
- exit(1);
- }
-
- tag = (struct bcm_tag *) (buf + offset);
-
- cfelen = strntoul(tag->cfe_length, NULL, 10, IMAGE_LEN);
- if (cfelen) {
- fprintf(stderr, "Non-zero CFE length. This is currently unsupported.\n");
- exit(1);
- }
-
- if (quiet < 2) {
- fprintf(stderr, "Verifying we actually have an imagetag.\n");
- }
-
- headercrc = compute_crc32(CRC_START, offset, offsetof(struct bcm_tag, header_crc), fd);
- if (headercrc != *(uint32_t *)(&tag->header_crc)) {
- fprintf(stderr, "Tag verify failed. This may not be a valid image.\n");
- exit(1);
- }
-
- if (quiet < 2) {
- fprintf(stderr, "Checking current fixed status.\n");
- }
-
- rootfslen = strntoul(&tag->root_length[0], NULL, 10, IMAGE_LEN);
- if (rootfslen == 0) {
- if (quiet < 2)
- fprintf(stderr, "Header already fixed, exiting\n");
- close(fd);
- return 0;
- }
-
- if (quiet < 2) {
- fprintf(stderr, "Setting root length to 0.\n");
- }
-
- sprintf(&tag->root_length[0], "%u", 0);
- strncpy(&tag->total_length[0], &tag->kernel_length[0], IMAGE_LEN);
-
- if (quiet < 2) {
- fprintf(stderr, "Recalculating CRCs.\n");
- }
-
- imagestart = sizeof(tag);
- memcpy(&tag->image_crc, &tag->kernel_crc, sizeof(uint32_t));
- memcpy(&tag->fskernel_crc, &tag->kernel_crc, sizeof(uint32_t));
- rootfscrc = CRC_START;
- memcpy(&tag->rootfs_crc, &rootfscrc, sizeof(uint32_t));
- headercrc = crc32(CRC_START, tag, offsetof(struct bcm_tag, header_crc));
- memcpy(&tag->header_crc, &headercrc, sizeof(uint32_t));
-
- if (quiet < 2) {
- fprintf(stderr, "Erasing imagetag block\n");
- }
-
- if (mtd_erase_block(fd, block_offset)) {
- fprintf(stderr, "Can't erase block at 0x%x (%s)\n", block_offset, strerror(errno));
- exit(1);
- }
-
- if (quiet < 2) {
- fprintf(stderr, "New image crc32: 0x%x, rewriting block\n",
- *(uint32_t *)(&tag->image_crc));
- fprintf(stderr, "New header crc32: 0x%x, rewriting block\n", headercrc);
- }
-
- if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
- fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
- exit(1);
- }
-
- if (quiet < 2)
- fprintf(stderr, "Done.\n");
-
- close (fd);
- sync();
- return 0;
-
-}
projects / openwrt / staging / florian.git / blobdiff