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