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1 office 1 /*
2 * motorola-bin.c
3 *
4 * Copyright (C) 2005-2006 Mike Baker,
5 * Imre Kaloz <kaloz@openwrt.org>
6 * D. Hugh Redelmeier
7 * OpenWrt.org
8 *
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 */
25  
26 /*
27 * Motorola's firmware flashing code requires an extra header.
28 * The header is eight bytes (see struct motorola below).
29 * This program will take a firmware file and create a new one
30 * with this header:
31 * motorola-bin --wr850g WR850G_V403.stripped.trx WR850G_V403.trx
32 *
33 * Note: Motorola's firmware is distributed with this header.
34 * If you need to flash Motorola firmware on a router running OpenWRT,
35 * you will to remove this header. Use the --strip flag:
36 * motorola-bin --strip WR850G_V403.trx WR850G_V403.stripped.trx
37 */
38  
39 /*
40 * February 1, 2006
41 *
42 * Add support for for creating WA840G and WE800G images
43 */
44  
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <stddef.h>
48 #include <unistd.h>
49 #include <errno.h>
50 #include <fcntl.h>
51 #include <sys/mman.h>
52 #include <string.h>
53 #include <netinet/in.h>
54 #include <inttypes.h>
55  
56 #define BPB 8 /* bits/byte */
57  
58 static uint32_t crc32[1<<BPB];
59  
60 static void init_crc32()
61 {
62 const uint32_t poly = ntohl(0x2083b8ed);
63 int n;
64  
65 for (n = 0; n < 1<<BPB; n++) {
66 uint32_t crc = n;
67 int bit;
68  
69 for (bit = 0; bit < BPB; bit++)
70 crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
71 crc32[n] = crc;
72 }
73 }
74  
75 static uint32_t crc32buf(unsigned char *buf, size_t len)
76 {
77 uint32_t crc = 0xFFFFFFFF;
78  
79 for (; len; len--, buf++)
80 crc = crc32[(uint8_t)crc ^ *buf] ^ (crc >> BPB);
81 return crc;
82 }
83  
84 struct motorola {
85 uint32_t crc; // crc32 of the remainder
86 uint32_t flags; // unknown, 105770*
87 };
88  
89 static const struct model {
90 char digit; /* a digit signifying model (historical) */
91 const char *name;
92 uint32_t flags;
93 } models[] = {
94 { '1', "WR850G", 0x10577050LU },
95 { '2', "WA840G", 0x10577040LU },
96 { '3', "WE800G", 0x10577000LU },
97 { '\0', NULL, 0 }
98 };
99  
100 static void usage(const char *) __attribute__ (( __noreturn__ ));
101  
102 static void usage(const char *mess)
103 {
104 const struct model *m;
105  
106 fprintf(stderr, "Error: %s\n", mess);
107 fprintf(stderr, "Usage: motorola-bin -device|--strip infile outfile\n");
108 fprintf(stderr, "Known devices: ");
109  
110 for (m = models; m->digit != '\0'; m++)
111 fprintf(stderr, " %c - %s", m->digit, m->name);
112  
113 fprintf(stderr, "\n");
114 exit(1);
115 }
116  
117 int main(int argc, char **argv)
118 {
119 off_t len; // of original firmware
120 int fd;
121 void *trx; // pointer to original firmware (mmmapped)
122 struct motorola *firmware; // pionter to prefix + copy of original firmware
123 uint32_t flags;
124  
125 // verify parameters
126  
127 if (argc != 4)
128 usage("wrong number of arguments");
129  
130 // mmap trx file
131 if ((fd = open(argv[2], O_RDONLY)) < 0
132 || (len = lseek(fd, 0, SEEK_END)) < 0
133 || (trx = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1)
134 || close(fd) < 0)
135 {
136 fprintf(stderr, "Error loading file %s: %s\n", argv[2], strerror(errno));
137 exit(1);
138 }
139  
140 init_crc32();
141  
142 if (strcmp(argv[1], "--strip") == 0)
143 {
144 const char *ugh = NULL;
145  
146 if (len < sizeof(struct motorola)) {
147 ugh = "input file too short";
148 } else {
149 const struct model *m;
150  
151 firmware = trx;
152 if (htonl(crc32buf(trx + offsetof(struct motorola, flags), len - offsetof(struct motorola, flags))) != firmware->crc)
153 ugh = "Invalid CRC";
154 for (m = models; ; m++) {
155 if (m->digit == '\0') {
156 if (ugh == NULL)
157 ugh = "unrecognized flags field";
158 break;
159 }
160 if (firmware->flags == htonl(m->flags)) {
161 fprintf(stderr, "Firmware for Motorola %s\n", m->name);
162 break;
163 }
164 }
165 }
166  
167 if (ugh != NULL) {
168 fprintf(stderr, "%s\n", ugh);
169 exit(3);
170 } else {
171 // all is well, write the file without the prefix
172 if ((fd = open(argv[3], O_CREAT|O_WRONLY|O_TRUNC,0644)) < 0
173 || write(fd, trx + sizeof(struct motorola), len - sizeof(struct motorola)) != len - sizeof(struct motorola)
174 || close(fd) < 0)
175 {
176 fprintf(stderr, "Error storing file %s: %s\n", argv[3], strerror(errno));
177 exit(2);
178 }
179 }
180  
181 } else {
182 // setup the firmware flags magic number
183 const struct model *m;
184 const char *df = argv[1];
185  
186 if (*df != '-')
187 usage("first argument must start with -");
188 if (*++df == '-')
189 ++df; /* allow but don't require second - */
190  
191 for (m = models; ; m++) {
192 if (m->digit == '\0')
193 usage("unrecognized device specified");
194 if ((df[0] == m->digit && df[1] == '\0') || strcasecmp(df, m->name) == 0) {
195 flags = m->flags;
196 break;
197 }
198 }
199  
200  
201 // create a firmware image in memory
202 // and copy the trx to it
203 firmware = malloc(sizeof(struct motorola) + len);
204 memcpy(&firmware[1], trx, len);
205  
206 // setup the motorola headers
207 firmware->flags = htonl(flags);
208  
209 // CRC of flags + firmware
210 firmware->crc = htonl(crc32buf((unsigned char *)&firmware->flags, sizeof(firmware->flags) + len));
211  
212 // write the firmware
213 if ((fd = open(argv[3], O_CREAT|O_WRONLY|O_TRUNC,0644)) < 0
214 || write(fd, firmware, sizeof(struct motorola) + len) != sizeof(struct motorola) + len
215 || close(fd) < 0)
216 {
217 fprintf(stderr, "Error storing file %s: %s\n", argv[3], strerror(errno));
218 exit(2);
219 }
220  
221 free(firmware);
222 }
223  
224 munmap(trx,len);
225  
226 return 0;
227 }