+/*
+ * Copyright (C) 2014 Claudio Leite <leitec@staticky.com>
+ *
+ * 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
+ */
+
+/*
+ * Builds a proper flash image for routers using some Gemtek
+ * OEM boards. These include the Airlink101 AR725W, the
+ * Asante SmartHub 600 (AWRT-600N), and Linksys WRT100/110.
+ *
+ * The resulting image is compatible with the factory firmware
+ * web upgrade and TFTP interface.
+ *
+ * To build:
+ * gcc -O2 -o mkheader_gemtek mkheader_gemtek.c -lz
+ *
+ * Claudio Leite <leitec@staticky.com>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <zlib.h> /* for crc32() */
+
+/*
+ * The header is in little-endian format. In case
+ * we are on a BE host, we need to swap binary
+ * values.
+ */
+#ifdef __APPLE__
+# include <libkern/OSByteOrder.h>
+# define le32 OSSwapHostToLittleInt32
+#else
+# if defined(__linux__)
+# include <endian.h>
+# if __BYTE_ORDER == __BIG_ENDIAN
+# define CPU_BIG_ENDIAN
+# endif
+# else
+# include <sys/endian.h> /* BSD's should have this */
+# if _BYTE_ORDER == _BIG_ENDIAN
+# define CPU_BIG_ENDIAN
+# endif
+# endif
+# ifdef CPU_BIG_ENDIAN
+# define le32(x) (((x & 0xff000000) >> 24) | \
+ ((x & 0x00ff0000) >> 8) | \
+ ((x & 0x0000ff00) << 8) | \
+ ((x & 0x000000ff) << 24))
+# else
+# define le32(x) (x)
+# endif
+#endif
+
+struct gemtek_header {
+ uint8_t magic[4];
+ uint8_t version[4];
+ uint32_t product_id;
+ uint32_t imagesz;
+ uint32_t checksum;
+ uint32_t fast_checksum;
+ uint8_t build[4];
+ uint8_t lang[4];
+};
+
+#define HDRLEN sizeof(struct gemtek_header)
+
+struct machines {
+ char *desc;
+ char *id;
+ uint32_t maxsize;
+ struct gemtek_header header;
+};
+
+struct machines mach_def[] = {
+ {"Airlink101 AR725W", "ar725w", 0x340000,
+ {"GMTK", "1003", le32(0x03000001), 0, 0,
+ 0, "01\0\0", "EN\0\0"}},
+ {"Asante AWRT-600N", "awrt600n", 0x340000,
+ {"A600", "1005", le32(0x03000001), 0, 0,
+ 0, "01\0\0", "EN\0\0"}},
+ {"Linksys WRT100", "wrt100", 0x320000,
+ {"GMTK", "1007", le32(0x03040001), 0, 0,
+ 0, "2\0\0\0", "EN\0\0"}},
+ {"Linksys WRT110", "wrt110", 0x320000,
+ {"GMTK", "1007", le32(0x03040001), 0, 0,
+ 0, "2\0\0\0", "EN\0\0"}},
+ {0}
+};
+
+int
+main(int argc, char *argv[])
+{
+ unsigned long res, flen;
+ struct gemtek_header my_hdr;
+ FILE *f, *f_out;
+ int image_type = -1, index;
+ uint8_t *buf;
+ uint32_t crc;
+
+ if (argc < 3) {
+ fprintf(stderr, "mkheader_gemtek <uImage> <webflash image> [machine ID]\n");
+ fprintf(stderr, " where [machine ID] is one of:\n");
+ for (index = 0; mach_def[index].desc != 0; index++) {
+ fprintf(stderr, " %-10s %s", mach_def[index].id, mach_def[index].desc);
+ if (index == 0)
+ fprintf(stderr, " (default)\n");
+ else
+ fprintf(stderr, "\n");
+ }
+
+ exit(-1);
+ }
+
+ if (argc == 4) {
+ for(index = 0; mach_def[index].id != 0; index++) {
+ if(strcmp(mach_def[index].id, argv[3]) == 0) {
+ image_type = index;
+ break;
+ }
+ }
+
+ if(image_type == -1) {
+ fprintf(stderr, "\nERROR: invalid machine type\n");
+ exit(-1);
+ }
+ } else
+ image_type = 0;
+
+ printf("Opening %s...\n", argv[1]);
+
+ f = fopen(argv[1], "r");
+ if(!f) {
+ fprintf(stderr, "\nERROR: couldn't open input image\n");
+ exit(-1);
+ }
+
+ fseek(f, 0, SEEK_END);
+ flen = (unsigned long) ftell(f);
+
+ printf(" %lu (0x%lX) bytes long\n", flen, flen);
+
+ if (flen > mach_def[image_type].maxsize) {
+ fprintf(stderr, "\nERROR: image exceeds maximum compatible size\n");
+ goto f_error;
+ }
+
+ buf = malloc(flen + HDRLEN);
+ if (!buf) {
+ fprintf(stderr, "\nERROR: couldn't allocate buffer\n");
+ goto f_error;
+ }
+ rewind(f);
+ res = fread(buf + HDRLEN, 1, flen, f);
+ if (res != flen) {
+ perror("Couldn't read entire file: fread()");
+ goto f_error;
+ }
+ fclose(f);
+
+ printf("\nCreating %s...\n", argv[2]);
+
+ memcpy(&my_hdr, &mach_def[image_type].header, HDRLEN);
+
+ printf(" Using %s magic\n", mach_def[image_type].desc);
+
+ my_hdr.imagesz = le32(flen + HDRLEN);
+ memcpy(my_hdr.lang, "EN", 2);
+
+ memcpy(buf, &my_hdr, HDRLEN);
+
+ crc = crc32(0, buf, flen + HDRLEN);
+ printf(" CRC32: %08X\n", crc);
+
+ my_hdr.checksum = le32(crc);
+ memcpy(buf, &my_hdr, HDRLEN);
+
+ printf(" Writing...\n");
+
+ f_out = fopen(argv[2], "w");
+ if(!f_out) {
+ fprintf(stderr, "\nERROR: couldn't open output image\n");
+ exit(-1);
+ }
+
+ fwrite(buf, 1, flen + HDRLEN, f_out);
+
+ fclose(f_out);
+
+ free(buf);
+ return 0;
+
+f_error:
+ fclose(f);
+ exit(-1);
+}
projects / openwrt.git / commitdiff