1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * motorola-bin.c 4 * 5 * Copyright (C) 2005-2006 Mike Baker, 6 * Imre Kaloz <kaloz@openwrt.org> 7 * D. Hugh Redelmeier 8 * OpenWrt.org 9 */ 10 11 /* 12 * Motorola's firmware flashing code requires an extra header. 13 * The header is eight bytes (see struct motorola below). 14 * This program will take a firmware file and create a new one 15 * with this header: 16 * motorola-bin --wr850g WR850G_V403.stripped.trx WR850G_V403.trx 17 * 18 * Note: Motorola's firmware is distributed with this header. 19 * If you need to flash Motorola firmware on a router running OpenWRT, 20 * you will to remove this header. Use the --strip flag: 21 * motorola-bin --strip WR850G_V403.trx WR850G_V403.stripped.trx 22 */ 23 24 /* 25 * February 1, 2006 26 * 27 * Add support for for creating WA840G and WE800G images 28 */ 29 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <stddef.h> 33 #include <unistd.h> 34 #include <errno.h> 35 #include <fcntl.h> 36 #include <sys/mman.h> 37 #include <string.h> 38 #include <netinet/in.h> 39 #include <inttypes.h> 40 41 #define BPB 8 /* bits/byte */ 42 43 static uint32_t crc32[1<<BPB]; 44 45 static void init_crc32() 46 { 47 const uint32_t poly = ntohl(0x2083b8ed); 48 int n; 49 50 for (n = 0; n < 1<<BPB; n++) { 51 uint32_t crc = n; 52 int bit; 53 54 for (bit = 0; bit < BPB; bit++) 55 crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1); 56 crc32[n] = crc; 57 } 58 } 59 60 static uint32_t crc32buf(unsigned char *buf, size_t len) 61 { 62 uint32_t crc = 0xFFFFFFFF; 63 64 for (; len; len--, buf++) 65 crc = crc32[(uint8_t)crc ^ *buf] ^ (crc >> BPB); 66 return crc; 67 } 68 69 struct motorola { 70 uint32_t crc; // crc32 of the remainder 71 uint32_t flags; // unknown, 105770* 72 }; 73 74 static const struct model { 75 char digit; /* a digit signifying model (historical) */ 76 const char *name; 77 uint32_t flags; 78 } models[] = { 79 { '1', "WR850G", 0x10577050LU }, 80 { '2', "WA840G", 0x10577040LU }, 81 { '3', "WE800G", 0x10577000LU }, 82 { '\0', NULL, 0 } 83 }; 84 85 static void usage(const char *) __attribute__ (( __noreturn__ )); 86 87 static void usage(const char *mess) 88 { 89 const struct model *m; 90 91 fprintf(stderr, "Error: %s\n", mess); 92 fprintf(stderr, "Usage: motorola-bin -device|--strip infile outfile\n"); 93 fprintf(stderr, "Known devices: "); 94 95 for (m = models; m->digit != '\0'; m++) 96 fprintf(stderr, " %c - %s", m->digit, m->name); 97 98 fprintf(stderr, "\n"); 99 exit(1); 100 } 101 102 int main(int argc, char **argv) 103 { 104 off_t len; // of original firmware 105 int fd; 106 void *trx; // pointer to original firmware (mmmapped) 107 struct motorola *firmware; // pionter to prefix + copy of original firmware 108 uint32_t flags; 109 110 // verify parameters 111 112 if (argc != 4) 113 usage("wrong number of arguments"); 114 115 // mmap trx file 116 if ((fd = open(argv[2], O_RDONLY)) < 0 117 || (len = lseek(fd, 0, SEEK_END)) < 0 118 || (trx = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1) 119 || close(fd) < 0) 120 { 121 fprintf(stderr, "Error loading file %s: %s\n", argv[2], strerror(errno)); 122 exit(1); 123 } 124 125 init_crc32(); 126 127 if (strcmp(argv[1], "--strip") == 0) 128 { 129 const char *ugh = NULL; 130 131 if (len < sizeof(struct motorola)) { 132 ugh = "input file too short"; 133 } else { 134 const struct model *m; 135 136 firmware = trx; 137 if (htonl(crc32buf(trx + offsetof(struct motorola, flags), len - offsetof(struct motorola, flags))) != firmware->crc) 138 ugh = "Invalid CRC"; 139 for (m = models; ; m++) { 140 if (m->digit == '\0') { 141 if (ugh == NULL) 142 ugh = "unrecognized flags field"; 143 break; 144 } 145 if (firmware->flags == htonl(m->flags)) { 146 fprintf(stderr, "Firmware for Motorola %s\n", m->name); 147 break; 148 } 149 } 150 } 151 152 if (ugh != NULL) { 153 fprintf(stderr, "%s\n", ugh); 154 exit(3); 155 } else { 156 // all is well, write the file without the prefix 157 if ((fd = open(argv[3], O_CREAT|O_WRONLY|O_TRUNC,0644)) < 0 158 || write(fd, trx + sizeof(struct motorola), len - sizeof(struct motorola)) != len - sizeof(struct motorola) 159 || close(fd) < 0) 160 { 161 fprintf(stderr, "Error storing file %s: %s\n", argv[3], strerror(errno)); 162 exit(2); 163 } 164 } 165 166 } else { 167 // setup the firmware flags magic number 168 const struct model *m; 169 const char *df = argv[1]; 170 171 if (*df != '-') 172 usage("first argument must start with -"); 173 if (*++df == '-') 174 ++df; /* allow but don't require second - */ 175 176 for (m = models; ; m++) { 177 if (m->digit == '\0') 178 usage("unrecognized device specified"); 179 if ((df[0] == m->digit && df[1] == '\0') || strcasecmp(df, m->name) == 0) { 180 flags = m->flags; 181 break; 182 } 183 } 184 185 186 // create a firmware image in memory 187 // and copy the trx to it 188 firmware = malloc(sizeof(struct motorola) + len); 189 memcpy(&firmware[1], trx, len); 190 191 // setup the motorola headers 192 firmware->flags = htonl(flags); 193 194 // CRC of flags + firmware 195 firmware->crc = htonl(crc32buf((unsigned char *)&firmware->flags, sizeof(firmware->flags) + len)); 196 197 // write the firmware 198 if ((fd = open(argv[3], O_CREAT|O_WRONLY|O_TRUNC,0644)) < 0 199 || write(fd, firmware, sizeof(struct motorola) + len) != sizeof(struct motorola) + len 200 || close(fd) < 0) 201 { 202 fprintf(stderr, "Error storing file %s: %s\n", argv[3], strerror(errno)); 203 exit(2); 204 } 205 206 free(firmware); 207 } 208 209 munmap(trx,len); 210 211 return 0; 212 } 213
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