2 * Copyright (C) 2012 Gabor Juhos <juhosg@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published
6 * by the Free Software Foundation.
14 #include <unistd.h> /* for unlink() */
16 #include <getopt.h> /* for getopt() */
21 #include <arpa/inet.h>
22 #include <netinet/in.h>
24 #define MAX_MODEL_LEN 20
25 #define MAX_SIGNATURE_LEN 30
26 #define MAX_REGION_LEN 4
27 #define MAX_VERSION_LEN 12
29 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
32 char *file_name; /* name of the file */
33 uint32_t file_size; /* length of the file */
41 char model[MAX_MODEL_LEN];
42 char signature[MAX_SIGNATURE_LEN];
43 char region[MAX_REGION_LEN];
44 char version[MAX_VERSION_LEN];
45 unsigned char header_len;
48 } __attribute__ ((packed));
54 static char *progname;
57 static char *signature;
58 static char *region = "DEF";
60 static struct file_info kernel_info;
61 static struct file_info rootfs_info;
62 static uint32_t kernel_size;
63 static uint32_t image_size;
68 #define ERR(fmt, ...) do { \
70 fprintf(stderr, "[%s] *** error: " fmt "\n", \
71 progname, ## __VA_ARGS__ ); \
74 #define ERRS(fmt, ...) do { \
77 fprintf(stderr, "[%s] *** error: " fmt " (%s)\n", \
78 progname, ## __VA_ARGS__, strerror(save)); \
81 #define DBG(fmt, ...) do { \
82 fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
85 static void usage(int status)
87 FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
89 fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
93 " -k <file> read kernel image from the file <file>\n"
94 " -M <model> set model to <model>\n"
95 " -o <file> write output to the file <file>\n"
96 " -r <file> read rootfs image from the file <file>\n"
97 " -S <signature> set image signature to <signature>\n"
98 " -R <region> set image region to <region>\n"
99 " -V <version> set image version to <version>\n"
100 " -I <size> set image size to <size>\n"
101 " -K <size> set kernel size to <size>\n"
102 " -h show this screen\n"
109 str2u32(char *arg, uint32_t *val)
115 t = strtoul(arg, &err, 0);
116 if (errno || (err==arg) || ((err != NULL) && *err)) {
124 static int get_file_stat(struct file_info *fdata)
129 if (fdata->file_name == NULL)
132 res = stat(fdata->file_name, &st);
134 ERRS("stat failed on %s", fdata->file_name);
138 fdata->file_size = st.st_size;
139 fdata->write_size = fdata->file_size;
143 static int read_to_buf(struct file_info *fdata, char *buf)
146 int ret = EXIT_FAILURE;
148 f = fopen(fdata->file_name, "r");
150 ERRS("could not open \"%s\" for reading", fdata->file_name);
155 fread(buf, fdata->file_size, 1, f);
157 ERRS("unable to read from file \"%s\"", fdata->file_name);
169 static int check_options(void)
173 #define CHKSTR(_name, _msg) \
175 if (_name == NULL) { \
176 ERR("no %s specified", _msg); \
181 #define CHKSTRLEN(_name, _msg) \
184 CHKSTR(_name, _msg); \
185 field_len = FIELD_SIZEOF(struct img_header, _name) - 1; \
186 if (strlen(_name) > field_len) { \
187 ERR("%s is too long, max length is %d", \
193 CHKSTRLEN(model, "model");
194 CHKSTRLEN(signature, "signature");
195 CHKSTRLEN(region, "region");
196 CHKSTRLEN(version, "version");
197 CHKSTR(ofname, "output file");
198 CHKSTR(kernel_info.file_name, "kernel image");
199 CHKSTR(rootfs_info.file_name, "rootfs image");
201 ret = get_file_stat(&kernel_info);
205 ret = get_file_stat(&rootfs_info);
210 /* override kernel size */
211 kernel_info.write_size = kernel_size;
215 if (image_size < kernel_info.write_size)
216 kernel_info.write_size = image_size;
218 /* override rootfs size */
219 rootfs_info.write_size = image_size - kernel_info.write_size;
222 if (kernel_info.file_size > kernel_info.write_size) {
223 ERR("kernel image is too big");
227 if (rootfs_info.file_size > rootfs_info.write_size) {
228 ERR("rootfs image is too big");
235 static int write_fw(char *data, int len)
238 int ret = EXIT_FAILURE;
240 f = fopen(ofname, "w");
242 ERRS("could not open \"%s\" for writing", ofname);
247 fwrite(data, len, 1, f);
249 ERRS("unable to write output file");
253 DBG("firmware file \"%s\" completed", ofname);
260 if (ret != EXIT_SUCCESS) {
267 static uint32_t get_csum(unsigned char *p, uint32_t len)
277 static int build_fw(void)
283 struct img_header *hdr;
284 int ret = EXIT_FAILURE;
286 buflen = sizeof(struct img_header) +
287 kernel_info.write_size + rootfs_info.write_size;
289 buf = malloc(buflen);
291 ERR("no memory for buffer\n");
295 memset(buf, 0, buflen);
297 p = buf + sizeof(struct img_header);
299 /* read kernel data */
300 ret = read_to_buf(&kernel_info, p);
304 p += kernel_info.write_size;
306 /* read rootfs data */
307 ret = read_to_buf(&rootfs_info, p);
311 csum = get_csum((unsigned char *)(buf + sizeof(struct img_header)),
312 buflen - sizeof(struct img_header));
314 /* fill firmware header */
315 hdr = (struct img_header *) buf;
317 hdr->checksum = htonl(csum);
318 hdr->image_size = htonl(buflen - sizeof(struct img_header));
319 hdr->kernel_size = htonl(kernel_info.write_size);
320 hdr->header_len = sizeof(struct img_header);
321 strncpy(hdr->model, model, sizeof(hdr->model));
322 strncpy(hdr->signature, signature, sizeof(hdr->signature));
323 strncpy(hdr->version, version, sizeof(hdr->version));
324 strncpy(hdr->region, region, sizeof(hdr->region));
326 ret = write_fw(buf, buflen);
338 int main(int argc, char *argv[])
340 int ret = EXIT_FAILURE;
342 progname = basename(argv[0]);
347 c = getopt(argc, argv, "M:S:V:R:k:K:I:r:o:h");
365 kernel_info.file_name = optarg;
368 if (str2u32(optarg, &kernel_size)) {
369 ERR("%s is invalid '%s'",
370 "kernel size", optarg);
375 if (str2u32(optarg, &image_size)) {
376 ERR("%s is invalid '%s'",
377 "image size", optarg);
382 rootfs_info.file_name = optarg;
396 ret = check_options();