mirror of https://github.com/hak5/openwrt.git
Felix Fietkau
parent
c9e697a355
commit
2df957c7a6
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@ -3,6 +3,7 @@
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*
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* Copyright (C) 2005-2006 Mike Baker,
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* Imre Kaloz <kaloz@openwrt.org>
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* D. Hugh Redelmeier
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* OpenWrt.org
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*
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* $Id$
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@ -23,6 +24,19 @@
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*
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*/
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/*
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* Motorola's firmware flashing code requires an extra header.
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* The header is eight bytes (see struct motorola below).
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* This program will take a firmware file and create a new one
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* with this header:
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* motorola-bin --wr850g WR850G_V403.stripped.trx WR850G_V403.trx
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*
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* Note: Motorola's firmware is distributed with this header.
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* If you need to flash Motorola firmware on a router running OpenWRT,
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* you will to remove this header. Use the --strip flag:
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* motorola-bin --strip WR850G_V403.trx WR850G_V403.stripped.trx
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*/
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/*
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* February 1, 2006
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*
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@ -31,116 +45,184 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <inttypes.h>
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unsigned long *crc32;
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#define BPB 8 /* bits/byte */
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void init_crc32()
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static uint32_t crc32[1<<BPB];
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static void init_crc32()
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{
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unsigned long crc;
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unsigned long poly = ntohl(0x2083b8ed);
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int n, bit;
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if ((crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long))) == (void *)-1) {
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perror("malloc");
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exit(1);
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}
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for (n = 0; n < 256; n++) {
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crc = (unsigned long) n;
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for (bit = 0; bit < 8; bit++)
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crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
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crc32[n] = crc;
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}
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const uint32_t poly = ntohl(0x2083b8ed);
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int n;
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for (n = 0; n < 1<<BPB; n++) {
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uint32_t crc = n;
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int bit;
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for (bit = 0; bit < BPB; bit++)
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crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
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crc32[n] = crc;
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}
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}
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unsigned int crc32buf(char *buf, size_t len)
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static uint32_t crc32buf(unsigned char *buf, size_t len)
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{
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unsigned int crc = 0xFFFFFFFF;
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for (; len; len--, buf++)
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crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
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return crc;
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uint32_t crc = 0xFFFFFFFF;
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for (; len; len--, buf++)
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crc = crc32[(uint8_t)crc ^ *buf] ^ (crc >> BPB);
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return crc;
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}
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struct motorola {
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unsigned int crc; // crc32 of the remainder
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unsigned int flags; // unknown, 105770*
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char *trx; // standard trx
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uint32_t crc; // crc32 of the remainder
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uint32_t flags; // unknown, 105770*
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};
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void usage(void) __attribute__ (( __noreturn__ ));
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static const struct model {
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char digit; /* a digit signifying model (historical) */
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const char *name;
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uint32_t flags;
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} models[] = {
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{ '1', "WR850G", 0x10577050LU },
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{ '2', "WA840G", 0x10577040LU },
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{ '3', "WE800G", 0x10577000LU },
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{ '\0', NULL, 0 }
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};
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void usage(void)
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static void usage(const char *) __attribute__ (( __noreturn__ ));
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static void usage(const char *mess)
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{
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printf("Usage: motorola-bin [-device] [trxfile] [binfile]\n\n");
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printf("Known devices: 1 - WR850G | 2 - WA840G | 3 - WE800G\n");
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const struct model *m;
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fprintf(stderr, "Error: %s\n", mess);
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fprintf(stderr, "Usage: motorola-bin -device|--strip infile outfile\n");
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fprintf(stderr, "Known devices: ");
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for (m = models; m->digit != '\0'; m++)
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fprintf(stderr, " %c - %s", m->digit, m->name);
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fprintf(stderr, "\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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unsigned int len;
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off_t len; // of original firmware
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int fd;
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int c;
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void *trx;
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struct motorola *firmware;
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void *trx; // pointer to original firmware (mmmapped)
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struct motorola *firmware; // pionter to prefix + copy of original firmware
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uint32_t flags;
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// verify parameters
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if (argc!=4)
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{
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usage();
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}
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if (argc != 4)
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usage("wrong number of arguments");
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// mmap trx file
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if (((fd = open(argv[2], O_RDONLY)) < 0)
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|| ((len = lseek(fd, 0, SEEK_END)) < 0)
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|| ((trx = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1))
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|| (close(fd) < 0)) {
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perror("open/malloc");
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if ((fd = open(argv[2], O_RDONLY)) < 0
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|| (len = lseek(fd, 0, SEEK_END)) < 0
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|| (trx = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1)
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|| close(fd) < 0)
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{
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fprintf(stderr, "Error loading file %s: %s\n", argv[2], strerror(errno));
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exit(1);
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}
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// create a firmware image in memory
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// and copy the trx to it
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firmware = malloc(len+8);
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memcpy(&firmware->trx,trx,len);
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munmap(trx,len);
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// setup the motorola headers
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init_crc32();
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// setup the firmware magic
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if (strcmp(argv[1], "--strip") == 0)
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{
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const char *ugh = NULL;
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while ((c = getopt(argc, argv, "123")) !=-1) {
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switch (c) {
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case '1':
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firmware->flags = ntohl(0x10577050); // Motorola WR850G
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break;
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case '2':
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firmware->flags = ntohl(0x10577040); // Motorola WA840G
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break;
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case '3':
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firmware->flags = ntohl(0x10577000); // Motorola WE800G
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break;
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default:
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usage();
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if (len < sizeof(struct motorola)) {
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ugh = "input file too short";
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} else {
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const struct model *m;
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firmware = trx;
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if (htonl(crc32buf(trx + offsetof(struct motorola, flags), len - offsetof(struct motorola, flags))) != firmware->crc)
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ugh = "Invalid CRC";
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for (m = models; ; m++) {
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if (m->digit == '\0') {
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if (ugh == NULL)
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ugh = "unrecognized flags field";
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break;
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}
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if (firmware->flags == htonl(m->flags)) {
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fprintf(stderr, "Firmware for Motorola %s\n", m->name);
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break;
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}
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}
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}
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if (ugh != NULL) {
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fprintf(stderr, "%s\n", ugh);
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exit(3);
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} else {
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// all is well, write the file without the prefix
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if ((fd = open(argv[3], O_CREAT|O_WRONLY,0644)) < 0
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|| write(fd, trx + sizeof(struct motorola), len - sizeof(struct motorola)) != len - sizeof(struct motorola)
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|| close(fd) < 0)
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{
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fprintf(stderr, "Error storing file %s: %s\n", argv[3], strerror(errno));
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exit(2);
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}
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}
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} else {
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// setup the firmware flags magic number
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const struct model *m;
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const char *df = argv[1];
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if (*df != '-')
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usage("first argument must start with -");
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if (*++df == '-')
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++df; /* allow but don't require second - */
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for (m = models; ; m++) {
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if (m->digit == '\0')
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usage("unrecognized device specified");
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if ((df[0] == m->digit && df[1] == '\0') || strcasecmp(df, m->name) == 0) {
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flags = m->flags;
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break;
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}
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}
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// create a firmware image in memory
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// and copy the trx to it
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firmware = malloc(sizeof(struct motorola) + len);
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memcpy(&firmware[1], trx, len);
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// setup the motorola headers
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firmware->flags = htonl(flags);
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// CRC of flags + firmware
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firmware->crc = htonl(crc32buf((unsigned char *)&firmware->flags, sizeof(firmware->flags) + len));
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// write the firmware
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if ((fd = open(argv[3], O_CREAT|O_WRONLY,0644)) < 0
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|| write(fd, firmware, sizeof(struct motorola) + len) != sizeof(struct motorola) + len
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|| close(fd) < 0)
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{
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fprintf(stderr, "Error storing file %s: %s\n", argv[3], strerror(errno));
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exit(2);
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}
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free(firmware);
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}
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firmware->crc = htonl(crc32buf((char *)&firmware->flags,len+4));
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// write the firmware
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if (((fd = open(argv[3], O_CREAT|O_WRONLY,0644)) < 0)
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|| (write(fd,firmware,len+8) != len+8)
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|| (close(fd) < 0)) {
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perror("write");
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exit(-1);
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}
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free(firmware);
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munmap(trx,len);
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return 0;
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}
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