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Diffstat (limited to 'tools/firmware-utils/src/motorola-bin.c')
| -rw-r--r-- | tools/firmware-utils/src/motorola-bin.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/motorola-bin.c b/tools/firmware-utils/src/motorola-bin.c new file mode 100644 index 000000000..fecb4ce95 --- /dev/null +++ b/tools/firmware-utils/src/motorola-bin.c @@ -0,0 +1,227 @@ +/* + * motorola-bin.c + * + * Copyright (C) 2005-2006 Mike Baker, + * Imre Kaloz <kaloz@openwrt.org> + * D. Hugh Redelmeier + * 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. + * + */ + +/* + * Motorola's firmware flashing code requires an extra header. + * The header is eight bytes (see struct motorola below). + * This program will take a firmware file and create a new one + * with this header: + * motorola-bin --wr850g WR850G_V403.stripped.trx WR850G_V403.trx + * + * Note: Motorola's firmware is distributed with this header. + * If you need to flash Motorola firmware on a router running OpenWRT, + * you will to remove this header. Use the --strip flag: + * motorola-bin --strip WR850G_V403.trx WR850G_V403.stripped.trx + */ + +/* + * February 1, 2006 + * + * Add support for for creating WA840G and WE800G images + */ + +#include <stdio.h> +#include <stdlib.h> +#include <stddef.h> +#include <unistd.h> +#include <errno.h> +#include <fcntl.h> +#include <sys/mman.h> +#include <string.h> +#include <netinet/in.h> +#include <inttypes.h> + +#define BPB 8 /* bits/byte */ + +static uint32_t crc32[1<<BPB]; + +static void init_crc32() +{ + const uint32_t poly = ntohl(0x2083b8ed); + int n; + + for (n = 0; n < 1<<BPB; n++) { + uint32_t crc = n; + int bit; + + for (bit = 0; bit < BPB; bit++) + crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1); + crc32[n] = crc; + } +} + +static uint32_t crc32buf(unsigned char *buf, size_t len) +{ + uint32_t crc = 0xFFFFFFFF; + + for (; len; len--, buf++) + crc = crc32[(uint8_t)crc ^ *buf] ^ (crc >> BPB); + return crc; +} + +struct motorola { + uint32_t crc; // crc32 of the remainder + uint32_t flags; // unknown, 105770* +}; + +static const struct model { + char digit; /* a digit signifying model (historical) */ + const char *name; + uint32_t flags; +} models[] = { + { '1', "WR850G", 0x10577050LU }, + { '2', "WA840G", 0x10577040LU }, + { '3', "WE800G", 0x10577000LU }, + { '\0', NULL, 0 } +}; + +static void usage(const char *) __attribute__ (( __noreturn__ )); + +static void usage(const char *mess) +{ + const struct model *m; + + fprintf(stderr, "Error: %s\n", mess); + fprintf(stderr, "Usage: motorola-bin -device|--strip infile outfile\n"); + fprintf(stderr, "Known devices: "); + + for (m = models; m->digit != '\0'; m++) + fprintf(stderr, " %c - %s", m->digit, m->name); + + fprintf(stderr, "\n"); + exit(1); +} + +int main(int argc, char **argv) +{ + off_t len; // of original firmware + int fd; + void *trx; // pointer to original firmware (mmmapped) + struct motorola *firmware; // pionter to prefix + copy of original firmware + uint32_t flags; + + // verify parameters + + if (argc != 4) + usage("wrong number of arguments"); + + // mmap trx file + if ((fd = open(argv[2], O_RDONLY)) < 0 + || (len = lseek(fd, 0, SEEK_END)) < 0 + || (trx = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1) + || close(fd) < 0) + { + fprintf(stderr, "Error loading file %s: %s\n", argv[2], strerror(errno)); + exit(1); + } + + init_crc32(); + + if (strcmp(argv[1], "--strip") == 0) + { + const char *ugh = NULL; + + if (len < sizeof(struct motorola)) { + ugh = "input file too short"; + } else { + const struct model *m; + + firmware = trx; + if (htonl(crc32buf(trx + offsetof(struct motorola, flags), len - offsetof(struct motorola, flags))) != firmware->crc) + ugh = "Invalid CRC"; + for (m = models; ; m++) { + if (m->digit == '\0') { + if (ugh == NULL) + ugh = "unrecognized flags field"; + break; + } + if (firmware->flags == htonl(m->flags)) { + fprintf(stderr, "Firmware for Motorola %s\n", m->name); + break; + } + } + } + + if (ugh != NULL) { + fprintf(stderr, "%s\n", ugh); + exit(3); + } else { + // all is well, write the file without the prefix + if ((fd = open(argv[3], O_CREAT|O_WRONLY|O_TRUNC,0644)) < 0 + || write(fd, trx + sizeof(struct motorola), len - sizeof(struct motorola)) != len - sizeof(struct motorola) + || close(fd) < 0) + { + fprintf(stderr, "Error storing file %s: %s\n", argv[3], strerror(errno)); + exit(2); + } + } + + } else { + // setup the firmware flags magic number + const struct model *m; + const char *df = argv[1]; + + if (*df != '-') + usage("first argument must start with -"); + if (*++df == '-') + ++df; /* allow but don't require second - */ + + for (m = models; ; m++) { + if (m->digit == '\0') + usage("unrecognized device specified"); + if ((df[0] == m->digit && df[1] == '\0') || strcasecmp(df, m->name) == 0) { + flags = m->flags; + break; + } + } + + + // create a firmware image in memory + // and copy the trx to it + firmware = malloc(sizeof(struct motorola) + len); + memcpy(&firmware[1], trx, len); + + // setup the motorola headers + firmware->flags = htonl(flags); + + // CRC of flags + firmware + firmware->crc = htonl(crc32buf((unsigned char *)&firmware->flags, sizeof(firmware->flags) + len)); + + // write the firmware + if ((fd = open(argv[3], O_CREAT|O_WRONLY|O_TRUNC,0644)) < 0 + || write(fd, firmware, sizeof(struct motorola) + len) != sizeof(struct motorola) + len + || close(fd) < 0) + { + fprintf(stderr, "Error storing file %s: %s\n", argv[3], strerror(errno)); + exit(2); + } + + free(firmware); + } + + munmap(trx,len); + + return 0; +} |