*
* Copyright (C) 2005-2006 Mike Baker,
* Imre Kaloz <kaloz@openwrt.org>
+ * D. Hugh Redelmeier
* OpenWrt.org
*
* $Id$
*
*/
+/*
+ * 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
*
#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>
-unsigned long *crc32;
+#define BPB 8 /* bits/byte */
-void init_crc32()
+static uint32_t crc32[1<<BPB];
+
+static void init_crc32()
{
- unsigned long crc;
- unsigned long poly = ntohl(0x2083b8ed);
- int n, bit;
- if ((crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long))) == (void *)-1) {
- perror("malloc");
- exit(1);
- }
- for (n = 0; n < 256; n++) {
- crc = (unsigned long) n;
- for (bit = 0; bit < 8; bit++)
- crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
- crc32[n] = crc;
- }
+ 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;
+ }
}
-unsigned int crc32buf(char *buf, size_t len)
+static uint32_t crc32buf(unsigned char *buf, size_t len)
{
- unsigned int crc = 0xFFFFFFFF;
- for (; len; len--, buf++)
- crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
- return crc;
+ uint32_t crc = 0xFFFFFFFF;
+
+ for (; len; len--, buf++)
+ crc = crc32[(uint8_t)crc ^ *buf] ^ (crc >> BPB);
+ return crc;
}
struct motorola {
- unsigned int crc; // crc32 of the remainder
- unsigned int flags; // unknown, 105770*
- char *trx; // standard trx
+ 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 }
};
-void usage(void) __attribute__ (( __noreturn__ ));
+static void usage(const char *) __attribute__ (( __noreturn__ ));
-void usage(void)
+static void usage(const char *mess)
{
- printf("Usage: motorola-bin [-device] [trxfile] [binfile]\n\n");
- printf("Known devices: 1 - WR850G | 2 - WA840G | 3 - WE800G\n");
+ 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)
{
- unsigned int len;
+ off_t len; // of original firmware
int fd;
- int c;
- void *trx;
- struct motorola *firmware;
+ 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();
- }
+ 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)) {
- perror("open/malloc");
+ 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);
}
-
- // create a firmware image in memory
- // and copy the trx to it
- firmware = malloc(len+8);
- memcpy(&firmware->trx,trx,len);
- munmap(trx,len);
- // setup the motorola headers
init_crc32();
- // setup the firmware magic
+ 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;
+ }
+ }
+ }
- while ((c = getopt(argc, argv, "123")) !=-1) {
- switch (c) {
- case '1':
- firmware->flags = ntohl(0x10577050); // Motorola WR850G
- break;
- case '2':
- firmware->flags = ntohl(0x10577040); // Motorola WA840G
- break;
- case '3':
- firmware->flags = ntohl(0x10577000); // Motorola WE800G
+ 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,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;
- default:
- usage();
+ }
}
- }
- firmware->crc = htonl(crc32buf((char *)&firmware->flags,len+4));
- // write the firmware
- if (((fd = open(argv[3], O_CREAT|O_WRONLY,0644)) < 0)
- || (write(fd,firmware,len+8) != len+8)
- || (close(fd) < 0)) {
- perror("write");
- exit(-1);
+ // 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,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);
}
- free(firmware);
+ munmap(trx,len);
return 0;
}
projects / openwrt.git / blobdiff