aboutsummaryrefslogtreecommitdiffstats
path: root/tools/firmware-utils/src/mkwrggimg.c
blob: a224b25b608c5dc95054b150dfe5f26aaacfb773 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
/*
 *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
 *  Copyright (C) 2016 Stijn Tintel <stijn@linux-ipv6.be>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <libgen.h>
#include <getopt.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/stat.h>

#include "md5.h"

#define ERR(fmt, ...) do { \
	fflush(0); \
	fprintf(stderr, "[%s] *** error: " fmt "\n", \
			progname, ## __VA_ARGS__ ); \
} while (0)

#define ERRS(fmt, ...) do { \
	int save = errno; \
	fflush(0); \
	fprintf(stderr, "[%s] *** error: " fmt ", %s\n", \
			progname, ## __VA_ARGS__, strerror(save)); \
} while (0)

#define WRGG03_MAGIC	0x20080321

struct wrgg03_header {
	char		signature[32];
	uint32_t	magic1;
	uint32_t	magic2;
	char		version[16];
	char		model[16];
	uint32_t	flag[2];
	uint32_t	reserve[2];
	char		buildno[16];
	uint32_t	size;
	uint32_t	offset;
	char		devname[32];
	char		digest[16];
} __attribute__ ((packed));

static char *progname;
static char *ifname;
static char *ofname;
static char *signature;
static char *version;
static char *model;
static uint32_t flag = 0;
static uint32_t reserve = 0;
static char *buildno;
static uint32_t offset;
static char *devname;
static int big_endian;

void usage(int status)
{
	FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;

	fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
	fprintf(stream,
"\n"
"Options:\n"
"  -b              create image in big endian format\n"
"  -B <buildno>    build number\n"
"  -i <file>       read input from the file <file>\n"
"  -d <name>       set device name to <name>\n"
"  -m <model>      model name\n"
"  -o <file>       write output to the file <file>\n"
"  -O <offset>     set offset to <offset>\n"
"  -s <sig>        set image signature to <sig>\n"
"  -h              show this screen\n"
	);

	exit(status);
}

static void put_u32(void *data, uint32_t val, int swap)
{
	unsigned char *p = data;

	if (swap) {
		p[0] = (val >> 24) & 0xff;
		p[1] = (val >> 16) & 0xff;
		p[2] = (val >> 8) & 0xff;
		p[3] = val & 0xff;
	} else {
		p[3] = (val >> 24) & 0xff;
		p[2] = (val >> 16) & 0xff;
		p[1] = (val >> 8) & 0xff;
		p[0] = val & 0xff;
	}
}

static void get_digest(struct wrgg03_header *header, char *data, int size)
{
	MD5_CTX ctx;

	MD5_Init(&ctx);

	MD5_Update(&ctx, (char *)&header->offset, sizeof(header->offset));
	MD5_Update(&ctx, (char *)&header->devname, sizeof(header->devname));
	MD5_Update(&ctx, data, size);

	MD5_Final(header->digest, &ctx);
}

int main(int argc, char *argv[])
{
	struct wrgg03_header *header;
	char *buf;
	struct stat st;
	int buflen;
	int err;
	int res = EXIT_FAILURE;

	FILE *outfile, *infile;

	progname = basename(argv[0]);

	while ( 1 ) {
		int c;

		c = getopt(argc, argv, "bd:i:m:o:s:v:B:O:h");
		if (c == -1)
			break;

		switch (c) {
		case 'b':
			big_endian = 1;
			break;
		case 'B':
			buildno = optarg;
			break;
		case 'd':
			devname = optarg;
			break;
		case 'i':
			ifname = optarg;
			break;
		case 'm':
			model = optarg;
			break;
		case 'o':
			ofname = optarg;
			break;
		case 's':
			signature = optarg;
			break;
		case 'v':
			version = optarg;
			break;
		case 'O':
			offset = strtoul(optarg, NULL, 0);
			break;
		case 'h':
			usage(EXIT_SUCCESS);
			break;

		default:
			usage(EXIT_FAILURE);
			break;
		}
	}

	if (signature == NULL) {
		ERR("no signature specified");
		goto err;
	}

	if (ifname == NULL) {
		ERR("no input file specified");
		goto err;
	}

	if (ofname == NULL) {
		ERR("no output file specified");
		goto err;
	}

	if (devname == NULL) {
		ERR("no device name specified");
		goto err;
	}

	if (model == NULL) {
		ERR("no model name specified");
		goto err;
	}

	if (buildno == NULL) {
		ERR("no build number specified");
		goto err;
	}

	if (version == NULL) {
		ERR("no version specified");
		goto err;
	}

	err = stat(ifname, &st);
	if (err){
		ERRS("stat failed on %s", ifname);
		goto err;
	}

	buflen = st.st_size + sizeof(struct wrgg03_header);
	buf = malloc(buflen);
	if (!buf) {
		ERR("no memory for buffer\n");
		goto err;
	}

	infile = fopen(ifname, "r");
	if (infile == NULL) {
		ERRS("could not open \"%s\" for reading", ifname);
		goto err_free;
	}

	errno = 0;
	fread(buf + sizeof(struct wrgg03_header), st.st_size, 1, infile);
	if (errno != 0) {
		ERRS("unable to read from file %s", ifname);
		goto close_in;
	}

	header = (struct wrgg03_header *) buf;
	memset(header, '\0', sizeof(struct wrgg03_header));

	strncpy(header->signature, signature, sizeof(header->signature));
	put_u32(&header->magic1, WRGG03_MAGIC, 0);
	put_u32(&header->magic2, WRGG03_MAGIC, 0);
	strncpy(header->version, version, sizeof(header->version));
	strncpy(header->model, model, sizeof(header->model));
	put_u32(&header->flag, flag, 0);
	put_u32(&header->reserve, reserve, 0);
	strncpy(header->buildno, buildno, sizeof(header->buildno));
	put_u32(&header->size, st.st_size, big_endian);
	put_u32(&header->offset, offset, big_endian);
	strncpy(header->devname, devname, sizeof(header->devname));

	get_digest(header, buf + sizeof(struct wrgg03_header), st.st_size);

	outfile = fopen(ofname, "w");
	if (outfile == NULL) {
		ERRS("could not open \"%s\" for writing", ofname);
		goto close_in;
	}

	errno = 0;
	fwrite(buf, buflen, 1, outfile);
	if (errno) {
		ERRS("unable to write to file %s", ofname);
		goto close_out;
	}

	fflush(outfile);

	res = EXIT_SUCCESS;

close_out:
	fclose(outfile);
	if (res != EXIT_SUCCESS)
		unlink(ofname);
close_in:
	fclose(infile);
err_free:
	free(buf);
err:
	return res;
}