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-rw-r--r--package/mtd/src/seama.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/package/mtd/src/seama.c b/package/mtd/src/seama.c
new file mode 100644
index 0000000..b0c8bf3
--- /dev/null
+++ b/package/mtd/src/seama.c
@@ -0,0 +1,179 @@
+/*
+ * seama.c
+ *
+ * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * Based on the trx fixup code:
+ * 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 <string.h>
+#include <errno.h>
+#include <arpa/inet.h>
+
+#include <sys/ioctl.h>
+#include <mtd/mtd-user.h>
+#include "mtd.h"
+#include "seama.h"
+#include "md5.h"
+
+#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
+seama_fix_md5(char *buf, size_t len)
+{
+ struct seama_hdr *shdr;
+ char *data;
+ size_t msize;
+ size_t isize;
+ MD5_CTX ctx;
+ unsigned char digest[16];
+ int i;
+
+ if (len < sizeof(struct seama_hdr))
+ return -1;
+
+ shdr = (struct seama_hdr *) buf;
+ if (shdr->magic != htonl(SEAMA_MAGIC)) {
+ fprintf(stderr, "no SEAMA header found\n");
+ return -1;
+ }
+
+ isize = ntohl(shdr->size);
+ msize = ntohs(shdr->metasize);
+ if (isize == 0) {
+ /* the image contains no checksum */
+ return -1;
+ }
+
+ len -= sizeof(struct seama_hdr) + sizeof(digest) + msize;
+ if (isize > len)
+ isize = len;
+
+ data = buf + sizeof(struct seama_hdr) + sizeof(digest) + msize;
+
+ MD5_Init(&ctx);
+ MD5_Update(&ctx, data, isize);
+ MD5_Final(digest, &ctx);
+
+ if (!memcmp(digest, &buf[sizeof(struct seama_hdr)], sizeof(digest))) {
+ if (quiet < 2)
+ fprintf(stderr, "the header is fixed already\n");
+ return -1;
+ }
+
+ if (quiet < 2) {
+ fprintf(stderr, "new size:%u, new MD5: ", isize);
+ for (i = 0; i < sizeof(digest); i++)
+ fprintf(stderr, "%02x", digest[i]);
+
+ fprintf(stderr, "\n");
+ }
+
+ /* update the size in the image */
+ shdr->size = htonl(isize);
+
+ /* update the checksum in the image */
+ for (i = 0; i < sizeof(digest); i++)
+ buf[sizeof(struct seama_hdr) + i] = digest[i];
+
+ return 0;
+}
+
+int
+mtd_fixseama(const char *mtd, size_t offset)
+{
+ int fd;
+ char *buf;
+ ssize_t res;
+ size_t block_offset;
+
+ if (quiet < 2)
+ fprintf(stderr, "Trying to fix SEAMA 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(mtdsize);
+ if (!buf) {
+ perror("malloc");
+ exit(1);
+ }
+
+ res = pread(fd, buf, mtdsize, block_offset);
+ if (res != mtdsize) {
+ perror("pread");
+ exit(1);
+ }
+
+ if (seama_fix_md5(buf, mtdsize))
+ goto out;
+
+ 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, "Rewriting block at 0x%x\n", block_offset);
+
+ 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");
+
+out:
+ close (fd);
+ sync();
+
+ return 0;
+}
+