avr/qmk/firmware - [no description]

about summary refs log tree commit diff stats

diff options

Diffstat (limited to 'lib')

0 files changed, 0 insertions, 0 deletions

='n10' href='#n10'>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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433

/*
 * Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
 *
 * 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>     /* for unlink() */
#include <libgen.h>
#include <getopt.h>     /* for getopt() */
#include <stdarg.h>
#include <errno.h>
#include <sys/stat.h>

#include <arpa/inet.h>
#include <netinet/in.h>

#define MAX_MODEL_LEN		20
#define MAX_SIGNATURE_LEN	30
#define MAX_REGION_LEN		4
#define MAX_VERSION_LEN		12

#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))

struct file_info {
	char		*file_name;	/* name of the file */
	uint32_t	file_size;	/* length of the file */
	uint32_t	write_size;
};

struct img_header {
	uint32_t	checksum;
	uint32_t	image_size;
	uint32_t	kernel_size;
	char		model[MAX_MODEL_LEN];
	char		signature[MAX_SIGNATURE_LEN];
	char		region[MAX_REGION_LEN];
	char		version[MAX_VERSION_LEN];
	unsigned char	header_len;
	unsigned char	is_tgz;
	unsigned char	pad[4];
} __attribute__ ((packed));

/*
 * Globals
 */
static char *ofname;
static char *progname;

static char *model;
static char *signature;
static char *region = "DEF";
static char *version;
static struct file_info kernel_info;
static struct file_info rootfs_info;
static uint32_t kernel_size;
static uint32_t image_size;
static int combined;

/*
 * Message macros
 */
#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 DBG(fmt, ...) do { \
	fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
} while (0)

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

	fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
	fprintf(stream,
"\n"
"Options:\n"
"  -k <file>       read kernel image from the file <file>\n"
"  -c              use the kernel image as a combined image\n"
"  -M <model>      set model to <model>\n"
"  -o <file>       write output to the file <file>\n"
"  -r <file>       read rootfs image from the file <file>\n"
"  -S <signature>  set image signature to <signature>\n"
"  -R <region>     set image region to <region>\n"
"  -V <version>    set image version to <version>\n"
"  -I <size>       set image size to <size>\n"
"  -K <size>       set kernel size to <size>\n"
"  -h              show this screen\n"
	);

	exit(status);
}

int
str2u32(char *arg, uint32_t *val)
{
	char *err = NULL;
	uint32_t t;

	errno=0;
	t = strtoul(arg, &err, 0);
	if (errno || (err==arg) || ((err != NULL) && *err)) {
		return -1;
	}

	*val = t;
	return 0;
}

static int get_file_stat(struct file_info *fdata)
{
	struct stat st;
	int res;

	if (fdata->file_name == NULL)
		return 0;

	res = stat(fdata->file_name, &st);
	if (res){
		ERRS("stat failed on %s", fdata->file_name);
		return res;
	}

	fdata->file_size = st.st_size;
	fdata->write_size = fdata->file_size;
	return 0;
}

static int read_to_buf(struct file_info *fdata, char *buf)
{
	FILE *f;
	int ret = EXIT_FAILURE;

	f = fopen(fdata->file_name, "r");
	if (f == NULL) {
		ERRS("could not open \"%s\" for reading", fdata->file_name);
		goto out;
	}

	errno = 0;
	fread(buf, fdata->file_size, 1, f);
	if (errno != 0) {
		ERRS("unable to read from file \"%s\"", fdata->file_name);
		goto out_close;
	}

	ret = EXIT_SUCCESS;

out_close:
	fclose(f);
out:
	return ret;
}

static int check_options(void)
{
	int ret;

#define CHKSTR(_name, _msg)				\
	do {						\
		if (_name == NULL) {			\
			ERR("no %s specified", _msg);	\
			return -1;			\
		}					\
	} while (0)

#define CHKSTRLEN(_name, _msg)					\
	do {							\
		int field_len;					\
		CHKSTR(_name, _msg);				\
		field_len = FIELD_SIZEOF(struct img_header, _name) - 1; \
		if (strlen(_name) > field_len) { 		\
			ERR("%s is too long, max length is %d",	\
			    _msg, field_len);			\
			return -1;				\
		}						\
	} while (0)

	CHKSTRLEN(model, "model");
	CHKSTRLEN(signature, "signature");
	CHKSTRLEN(region, "region");
	CHKSTRLEN(version, "version");
	CHKSTR(ofname, "output file");
	CHKSTR(kernel_info.file_name, "kernel image");

	ret = get_file_stat(&kernel_info);
	if (ret)
		return ret;

	if (combined) {
		if (!kernel_size) {
			ERR("kernel size must be specified for combined images");
			return -1;				\
		}

		if (!image_size)
			image_size = kernel_info.file_size;

		if (kernel_info.file_size > image_size) {
			ERR("kernel image is too big");
			return -1;
		}

		kernel_info.write_size = image_size;
	} else {
		CHKSTR(rootfs_info.file_name, "rootfs image");

		ret = get_file_stat(&rootfs_info);
		if (ret)
			return ret;

		if (kernel_size) {
			/* override kernel size */
			kernel_info.write_size = kernel_size;
		}

		if (image_size) {
			if (image_size < kernel_info.write_size)
				kernel_info.write_size = image_size;

			/* override rootfs size */
			rootfs_info.write_size = image_size - kernel_info.write_size;
		}

		if (kernel_info.file_size > kernel_info.write_size) {
			ERR("kernel image is too big");
			return -1;
		}

		if (rootfs_info.file_size > rootfs_info.write_size) {
			ERR("rootfs image is too big");
			return -1;
		}
	}

	return 0;
}

static int write_fw(char *data, int len)
{
	FILE *f;
	int ret = EXIT_FAILURE;

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

	errno = 0;
	fwrite(data, len, 1, f);
	if (errno) {
		ERRS("unable to write output file");
		goto out_flush;
	}

	DBG("firmware file \"%s\" completed", ofname);

	ret = EXIT_SUCCESS;

out_flush:
	fflush(f);
	fclose(f);
	if (ret != EXIT_SUCCESS) {
		unlink(ofname);
	}
out:
	return ret;
}

static uint32_t get_csum(unsigned char *p, uint32_t len)
{
	uint32_t csum = 0;

	while (len--)
		csum += *p++;

	return csum;
}

static int build_fw(void)
{
	int buflen;
	char *buf;
	char *p;
	uint32_t csum;
	struct img_header *hdr;
	int ret = EXIT_FAILURE;

	buflen = sizeof(struct img_header) +
		 kernel_info.write_size + rootfs_info.write_size;

	buf = malloc(buflen);
	if (!buf) {
		ERR("no memory for buffer\n");
		goto out;
	}

	memset(buf, 0, buflen);

	p = buf + sizeof(struct img_header);

	/* read kernel data */
	ret = read_to_buf(&kernel_info, p);
	if (ret)
		goto out_free_buf;

	if (!combined) {
		p += kernel_info.write_size;

		/* read rootfs data */
		ret = read_to_buf(&rootfs_info, p);
		if (ret)
			goto out_free_buf;
	}

	csum = get_csum((unsigned char *)(buf + sizeof(struct img_header)),
			buflen - sizeof(struct img_header));

	/* fill firmware header */
	hdr = (struct img_header *) buf;

	hdr->checksum = htonl(csum);
	hdr->image_size = htonl(buflen - sizeof(struct img_header));
	if (!combined)
		hdr->kernel_size = htonl(kernel_info.write_size);
	else
		hdr->kernel_size = htonl(kernel_size);
	hdr->header_len = sizeof(struct img_header);
	strncpy(hdr->model, model, sizeof(hdr->model));
	strncpy(hdr->signature, signature, sizeof(hdr->signature));
	strncpy(hdr->version, version, sizeof(hdr->version));
	strncpy(hdr->region, region, sizeof(hdr->region));

	ret = write_fw(buf, buflen);
	if (ret)
		goto out_free_buf;

	ret = EXIT_SUCCESS;

out_free_buf:
	free(buf);
out:
	return ret;
}

int main(int argc, char *argv[])
{
	int ret = EXIT_FAILURE;

	progname = basename(argv[0]);

	while (1) {
		int c;

		c = getopt(argc, argv, "M:S:V:R:k:K:I:r:o:hc");
		if (c == -1)
			break;

		switch (c) {
		case 'M':
			model = optarg;
			break;
		case 'S':
			signature = optarg;
			break;
		case 'V':
			version = optarg;
			break;
		case 'R':
			region = optarg;
			break;
		case 'k':
			kernel_info.file_name = optarg;
			break;
		case 'K':
			if (str2u32(optarg, &kernel_size)) {
				ERR("%s is invalid '%s'",
				    "kernel size", optarg);
				goto out;
			}
			break;
		case 'I':
			if (str2u32(optarg, &image_size)) {
				ERR("%s is invalid '%s'",
				    "image size", optarg);
				goto out;
			}
			break;
		case 'r':
			rootfs_info.file_name = optarg;
			break;
		case 'c':
			combined = 1;
			break;
		case 'o':
			ofname = optarg;
			break;
		case 'h':
			usage(EXIT_SUCCESS);
			break;
		default:
			usage(EXIT_FAILURE);
			break;
		}
	}

	ret = check_options();
	if (ret)
		goto out;

	ret = build_fw();

out:
	return ret;
}


context:
space:
mode: