firmware-utils: mkwrggimg: new tool for D-Link DAP-2695

Based on mkwrgimg.c.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: John Crispin <john@phrozen.org>

tools/firmware-utils/Makefile

@@ -57,6 +57,7 @@ define Host/Compile
 	$(call cc,buffalo-tag buffalo-lib, -Wall)
 	$(call cc,buffalo-tftp buffalo-lib, -Wall)
 	$(call cc,mkwrgimg md5, -Wall)
+	$(call cc,mkwrggimg md5, -Wall)
 	$(call cc,mkedimaximg)
 	$(call cc,mkbrncmdline)
 	$(call cc,mkbrnimg)

tools/firmware-utils/src/mkwrggimg.c

@@ -0,0 +1,282 @@
+/*
+ *  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;
+}