4 * Copyright (C) 2005 Mike Baker
5 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
6 * Copyrigth (C) 2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
33 #include <sys/ioctl.h>
39 ssize_t pread(int fd, void *buf, size_t count, off_t offset);
40 ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
42 #define CRC_START 0xFFFFFFFF
44 static uint32_t strntoul(char *str, char **endptr, int base, size_t len) {
48 newstr = calloc(len + 1, sizeof(char));
50 strncpy(newstr, str, len);
51 res = strtoul(newstr, endptr, base);
57 uint32_t compute_crc32(uint32_t crc, off_t start, size_t compute_len, int fd)
59 uint8_t readbuf[1024];
63 /* Read a buffer's worth of bytes */
64 while (fd && (compute_len >= sizeof(readbuf))) {
65 res = pread(fd, readbuf, sizeof(readbuf), offset);
66 crc = crc32(crc, readbuf, res);
67 compute_len = compute_len - res;
71 /* Less than buffer-size bytes remains, read compute_len bytes */
72 if (fd && (compute_len > 0)) {
73 res = pread(fd, readbuf, compute_len, offset);
74 crc = crc32(crc, readbuf, res);
81 trx_check(int imagefd, const char *mtd, char *buf, int *len)
83 struct bcm_tag *tag = (const struct bcm_tag *) buf;
88 if (strcmp(mtd, "linux") != 0)
91 *len = read(imagefd, buf, sizeof(struct bcm_tag));
92 if (*len < sizeof(struct bcm_tag)) {
93 fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
96 headerCRC = crc32buf(buf, offsetof(struct bcm_tag, headerCRC));
97 if (*(uint32_t *)(&tag->headerCRC[0]) != headerCRC) {
100 fprintf(stderr, "Bad header CRC got %08lx, calculated %08lx\n",
101 *(uint32_t *)(&tag->headerCRC[0]), headerCRC);
102 fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
103 "Please specify the correct file or use -f to force.\n");
108 /* check if image fits to mtd device */
109 fd = mtd_check_open(mtd);
111 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
115 imageLen = strntoul(&tag->totalLength[0], NULL, 10, IMAGE_LEN);
117 if(mtdsize < imageLen) {
118 fprintf(stderr, "Image too big for partition: %s\n", mtd);
128 mtd_fixtrx(const char *mtd, size_t offset)
135 uint32_t cfelen, imagelen, imagestart, rootfslen;
136 uint32_t imagecrc, rootfscrc, headercrc;
137 cfelen = imagelen = imagestart = imagecrc = rootfscrc = headercrc = rootfslen = 0;
140 fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
142 block_offset = offset & ~(erasesize - 1);
143 offset -= block_offset;
145 fd = mtd_check_open(mtd);
147 fprintf(stderr, "Could not open mtd device: %s\n", mtd);
151 if (block_offset + erasesize > mtdsize) {
152 fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
156 buf = malloc(erasesize);
162 res = pread(fd, buf, erasesize, block_offset);
163 if (res != erasesize) {
168 tag = (struct bcm_tag *) (buf + offset);
170 cfelen = strntoul(&tag->cfeLength[0], NULL, 10, IMAGE_LEN);
172 fprintf(stderr, "Non-zero CFE length. This is currently unsupported.\n");
177 fprintf(stderr, "Verifying we actually have an imagetag.\n");
180 headercrc = compute_crc32(CRC_START, offset, offsetof(struct bcm_tag, headerCRC), fd);
181 if (headercrc != *(uint32_t *)(&tag->headerCRC[0])) {
182 fprintf(stderr, "Tag verify failed. This may not be a valid image.\n");
187 fprintf(stderr, "Checking current fixed status.\n");
190 rootfslen = strntoul(&tag->rootLength[0], NULL, 10, IMAGE_LEN);
191 if (rootfslen == 0) {
193 fprintf(stderr, "Header already fixed, exiting\n");
199 fprintf(stderr, "Setting root length to 0.\n");
202 sprintf(&tag->rootLength[0], "%lu", 0);
203 strncpy(&tag->totalLength[0], &tag->kernelLength[0], IMAGE_LEN);
206 fprintf(stderr, "Recalculating CRCs.\n");
209 imagestart = sizeof(tag);
210 memcpy(&tag->imageCRC[0], &tag->kernelCRC[0], CRC_LEN);
211 memcpy(&tag->fskernelCRC[0], &tag->kernelCRC[0], CRC_LEN);
212 rootfscrc = CRC_START;
213 memcpy(&tag->rootfsCRC[0], &rootfscrc, sizeof(uint32_t));
214 headercrc = crc32(CRC_START, tag, offsetof(struct bcm_tag, headerCRC));
215 memcpy(&tag->headerCRC[0], &headercrc, sizeof(uint32_t));
218 fprintf(stderr, "Erasing imagetag block\n");
221 if (mtd_erase_block(fd, block_offset)) {
222 fprintf(stderr, "Can't erase block at 0x%x (%s)\n", block_offset, strerror(errno));
227 fprintf(stderr, "New image crc32: 0x%x, rewriting block\n",
228 *(uint32_t *)(&tag->imageCRC[0]));
229 fprintf(stderr, "New header crc32: 0x%x, rewriting block\n", headercrc);
232 if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
233 fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
238 fprintf(stderr, "Done.\n");