treewide: fix replace nbd@openwrt.org with nbd@nbd.name
[openwrt.org/openwrt.git] / package / system / mtd / src / trx.c
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/*
 * trx.c
 *
 * Copyright (C) 2005 Mike Baker
 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
 *
 * 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 <endian.h>
#include <string.h>
#include <errno.h>
 
#include <sys/ioctl.h>
#include <mtd/mtd-user.h>
#include "mtd.h"
#include "crc32.h"
 
#define TRX_MAGIC       0x30524448      /* "HDR0" */
#define TRX_CRC32_DATA_OFFSET   12      /* First 12 bytes are not covered by CRC32 */
#define TRX_CRC32_DATA_SIZE     16
struct trx_header {
        uint32_t magic;         /* "HDR0" */
        uint32_t len;           /* Length of file including header */
        uint32_t crc32;         /* 32-bit CRC from flag_version to end of file */
        uint32_t flag_version;  /* 0:15 flags, 16:31 version */
        uint32_t offsets[3];    /* Offsets of partitions from start of header */
};
 
#if __BYTE_ORDER == __BIG_ENDIAN
#define STORE32_LE(X)           ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define STORE32_LE(X)           (X)
#else
#error unknown endianness!
#endif
 
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);
 
int
trx_fixup(int fd, const char *name)
{
        struct mtd_info_user mtdInfo;
        unsigned long len;
        struct trx_header *trx;
        void *ptr, *scan;
        int bfd;
 
        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;
        }
 
        trx = ptr;
        if (trx->magic != TRX_MAGIC) {
                fprintf(stderr, "TRX header not found\n");
                goto err;
        }
 
        scan = ptr + offsetof(struct trx_header, flag_version);
        trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
        msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
        munmap(ptr, len);
        close(bfd);
        return 0;
 
err1:
        close(bfd);
err:
        fprintf(stderr, "Error fixing up TRX header\n");
        return -1;
}
 
#ifndef target_ar71xx
int
trx_check(int imagefd, const char *mtd, char *buf, int *len)
{
        const struct trx_header *trx = (const struct trx_header *) buf;
        int fd;
 
        if (strcmp(mtd, "firmware") != 0)
                return 1;
 
        if (*len < 32) {
                *len += read(imagefd, buf + *len, 32 - *len);
                if (*len < 32) {
                        fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
                        return 0;
                }
        }
 
        if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
                if (quiet < 2) {
                        fprintf(stderr, "Bad trx header\n");
                        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);
        }
 
        if(mtdsize < trx->len) {
                fprintf(stderr, "Image too big for partition: %s\n", mtd);
                close(fd);
                return 0;
        }
 
        close(fd);
        return 1;
}
#endif
 
int
mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
{
        size_t data_offset;
        int fd;
        struct trx_header *trx;
        char *first_block;
        char *buf;
        ssize_t res;
        size_t block_offset;
 
        if (quiet < 2)
                fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
 
        fd = mtd_check_open(mtd);
        if(fd < 0) {
                fprintf(stderr, "Could not open mtd device: %s\n", mtd);
                exit(1);
        }
 
        data_offset = offset + TRX_CRC32_DATA_OFFSET;
        if (data_size)
                data_size += TRX_CRC32_DATA_SIZE;
        else
                data_size = erasesize - TRX_CRC32_DATA_OFFSET;
 
        block_offset = offset & ~(erasesize - 1);
        offset -= block_offset;
 
        if (data_offset + data_size > mtdsize) {
                fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
                exit(1);
        }
 
        first_block = malloc(erasesize);
        if (!first_block) {
                perror("malloc");
                exit(1);
        }
 
        res = pread(fd, first_block, erasesize, block_offset);
        if (res != erasesize) {
                perror("pread");
                exit(1);
        }
 
        trx = (struct trx_header *)(first_block + offset);
        if (trx->magic != STORE32_LE(0x30524448)) {
                fprintf(stderr, "No trx magic found\n");
                exit(1);
        }
 
        if (trx->len == STORE32_LE(data_size + TRX_CRC32_DATA_OFFSET)) {
                if (quiet < 2)
                        fprintf(stderr, "Header already fixed, exiting\n");
                close(fd);
                return 0;
        }
 
        buf = malloc(data_size);
        if (!buf) {
                perror("malloc");
                exit(1);
        }
 
        res = pread(fd, buf, data_size, data_offset);
        if (res != data_size) {
                perror("pread");
                exit(1);
        }
 
        trx->len = STORE32_LE(data_size + offsetof(struct trx_header, flag_version));
 
        trx->crc32 = STORE32_LE(crc32buf(buf, data_size));
        if (mtd_erase_block(fd, block_offset)) {
                fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
                exit(1);
        }
 
        if (quiet < 2)
                fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
 
        if (pwrite(fd, first_block, 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;
 
}
 
 
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