ramips: add basics for Poray devices

This commit adds the basic elements to support Poray brand routers.
It contains a tool to do the encryption/obfuscation that is used in
Poray routers.

Support for Poray devices was worked on by:

Felix Kaechele <heffer@fedoraproject.org>
Luis Soltero <lsoltero@globalmarinenet.com>
Michel Stempin <michel.stempin@wanadoo.fr>

Signed-off-by: Felix Kaechele <heffer@fedoraproject.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37635 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 754 insertions, 0 deletions

diff --git a/tools/firmware-utils/Makefile b/tools/firmware-utils/Makefile
index 70edd48df7..c0d577e6b2 100644
--- a/tools/firmware-utils/Makefile
+++ b/tools/firmware-utils/Makefile
@@ -63,6 +63,7 @@ define Host/Compile
 	$(call cc,seama md5)
 	$(call cc,fix-u-media-header cyg_crc32,-Wall)
 	$(call cc,hcsmakeimage bcmalgo)
+	$(call cc,mkporayfw, -Wall)
 endef
 
 define Host/Install
diff --git a/tools/firmware-utils/src/mkporayfw.c b/tools/firmware-utils/src/mkporayfw.c
new file mode 100644
index 0000000000..b4d5d78417
--- /dev/null
+++ b/tools/firmware-utils/src/mkporayfw.c
@@ -0,0 +1,753 @@
+/*
+ * Builder/viewer/extractor utility for Poray firmware image files
+ *
+ * Copyright (C) 2013 Michel Stempin <michel.stempin@wanadoo.fr>
+ * Copyright (C) 2013 Felix Kaechele <felix@fetzig.org>
+ * Copyright (C) 2013 <admin@openschemes.com>
+ *
+ * This tool is based on:
+ *   TP-Link firmware upgrade tool.
+ *   Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * Itself based on:
+ *   TP-Link WR941 V2 firmware checksum fixing tool.
+ *   Copyright (C) 2008,2009 Wang Jian <lark@linux.net.cn>
+ *
+ * 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 <arpa/inet.h>
+#include <netinet/in.h>
+
+#if (__BYTE_ORDER == __BIG_ENDIAN)
+#  define HOST_TO_BE32(x)	(x)
+#  define BE32_TO_HOST(x)	(x)
+#  define HOST_TO_LE32(x)	bswap_32(x)
+#  define LE32_TO_HOST(x)	bswap_32(x)
+#else
+#  define HOST_TO_BE32(x)	bswap_32(x)
+#  define BE32_TO_HOST(x)	bswap_32(x)
+#  define HOST_TO_LE32(x)	(x)
+#  define LE32_TO_HOST(x)	(x)
+#endif
+
+/* Fixed header flags */
+#define HEADER_FLAGS		0x020e0000
+
+/* Recognized Hardware ID magic */
+#define HWID_HAME_MPR_A1_L8	0x32473352
+#define HWID_PORAY_R50B		0x31353033
+#define HWID_PORAY_R50D		0x33353033
+#define HWID_PORAY_R50E		0x34353033
+#define HWID_PORAY_M3		0x31353335
+#define HWID_PORAY_M4		0x32353335
+#define HWID_PORAY_Q3		0x33353335
+#define HWID_PORAY_X5_X6	0x35353335
+#define HWID_PORAY_X8		0x36353335
+#define HWID_PORAY_X1		0x38353335
+
+/* Recognized XOR obfuscation keys */
+#define KEY_HAME		0
+#define KEY_PORAY_1		1
+#define KEY_PORAY_2		2
+#define KEY_PORAY_3		3
+#define KEY_PORAY_4		4
+
+/* XOR key length */
+#define KEY_LEN			15
+
+struct file_info {
+	char		*file_name;	/* Name of the file */
+	uint32_t	file_size;	/* Length of the file */
+};
+
+struct fw_header {
+	uint32_t	hw_id;		/* Hardware id */
+	uint32_t	firmware_len;	/* Firmware data length */
+	uint32_t	flags;		/* Header flags */
+	uint8_t		pad[16];
+} __attribute__ ((packed));
+
+struct flash_layout {
+	char		*id;
+	uint32_t	fw_max_len;
+};
+
+struct board_info {
+	char		*id;
+	uint32_t	hw_id;
+	char		*layout_id;
+	uint32_t	key;
+};
+
+/*
+ * Globals
+ */
+static char *ofname;
+static char *progname;
+
+static char *board_id;
+static struct board_info *board;
+static char *layout_id;
+static struct flash_layout *layout;
+static char *opt_hw_id;
+static uint32_t hw_id;
+static struct file_info firmware_info;
+static uint32_t firmware_len = 0;
+
+static int inspect = 0;
+static int extract = 0;
+
+static uint8_t key[][KEY_LEN] = {
+  {0xC8, 0x3C, 0x3A, 0x93, 0xA2, 0x95, 0xC3, 0x63, 0x48, 0x45, 0x58, 0x09, 0x12, 0x03, 0x08},
+  {0x89, 0x6B, 0x5A, 0x93, 0x92, 0x95, 0xC3, 0x63, 0xD0, 0xA3, 0x9C, 0x92, 0x2E, 0xE6, 0xC7},
+  {0xC9, 0x1C, 0x3A, 0x93, 0x92, 0x95, 0xC3, 0x63, 0xD0, 0xA3, 0x9C, 0x92, 0x2E, 0xE6, 0xC7},
+  {0x19, 0x1B, 0x3A, 0x93, 0x92, 0x95, 0xC3, 0x63, 0xD0, 0xA3, 0x9C, 0x92, 0x2E, 0xE6, 0xC7},
+  {0x79, 0x7B, 0x7A, 0x93, 0x92, 0x95, 0xC3, 0x63, 0xD0, 0xA3, 0x9C, 0x92, 0x2E, 0xE6, 0xC7},
+};
+
+static struct flash_layout layouts[] = {
+	{
+		.id		= "4M",
+		.fw_max_len	= 0x3c0000,
+	}, {
+		.id		= "8M",
+		.fw_max_len	= 0x7c0000,
+	}, {
+		/* terminating entry */
+	}
+};
+
+static struct board_info boards[] = {
+	{
+		.id		= "MPR-A1",
+		.hw_id		= HWID_HAME_MPR_A1_L8,
+		.layout_id	= "4M",
+		.key		= KEY_HAME,
+	}, {
+		.id		= "MPR-L8",
+		.hw_id		= HWID_HAME_MPR_A1_L8,
+		.layout_id	= "4M",
+		.key		= KEY_HAME,
+	}, {
+		.id		= "R50B",
+		.hw_id		= HWID_PORAY_R50B,
+		.layout_id	= "4M",
+		.key		= KEY_PORAY_2,
+	}, {
+		.id		= "R50D",
+		.hw_id		= HWID_PORAY_R50D,
+		.layout_id	= "4M",
+		.key		= KEY_PORAY_3,
+	}, {
+		.id		= "R50E",
+		.hw_id		= HWID_PORAY_R50E,
+		.layout_id	= "4M",
+		.key		= KEY_PORAY_4,
+	}, {
+		.id		= "M3",
+		.hw_id		= HWID_PORAY_M3,
+		.layout_id	= "4M",
+		.key		= KEY_PORAY_1,
+	}, {
+		.id		= "M4",
+		.hw_id		= HWID_PORAY_M4,
+		.layout_id	= "4M",
+		.key		= KEY_PORAY_1,
+	}, {
+		.id		= "Q3",
+		.hw_id		= HWID_PORAY_Q3,
+		.layout_id	= "4M",
+		.key		= KEY_PORAY_1,
+	}, {
+		.id		= "X5 or X6",
+		.hw_id		= HWID_PORAY_X5_X6,
+		.layout_id	= "8M",
+		.key		= KEY_PORAY_1,
+	}, {
+		.id		= "X5",
+		.hw_id		= HWID_PORAY_X5_X6,
+		.layout_id	= "8M",
+		.key		= KEY_PORAY_1,
+	}, {
+		.id		= "X6",
+		.hw_id		= HWID_PORAY_X5_X6,
+		.layout_id	= "8M",
+		.key		= KEY_PORAY_1,
+	}, {
+		.id		= "X8",
+		.hw_id		= HWID_PORAY_X8,
+		.layout_id	= "8M",
+		.key		= KEY_PORAY_1,
+	}, {
+		.id		= "X1",
+		.hw_id		= HWID_PORAY_X1,
+		.layout_id	= "8M",
+		.key		= KEY_PORAY_1,
+	}, {
+		/* terminating entry */
+	}
+};
+
+/*
+ * 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)
+
+/*
+ * Find a board by its name
+ */
+static struct board_info *find_board(char *id)
+{
+	struct board_info *ret;
+	struct board_info *board;
+
+	ret = NULL;
+	for (board = boards; board->id != NULL; board++){
+		if (strcasecmp(id, board->id) == 0) {
+			ret = board;
+			break;
+		}
+	};
+
+	return ret;
+}
+
+/*
+ * Find a board by its hardware ID
+ */
+static struct board_info *find_board_by_hwid(uint32_t hw_id)
+{
+	struct board_info *board;
+
+	for (board = boards; board->id != NULL; board++) {
+		if (hw_id == board->hw_id)
+			return board;
+	};
+
+	return NULL;
+}
+
+/*
+ * Find a Flash memory layout by its name
+ */
+static struct flash_layout *find_layout(char *id)
+{
+	struct flash_layout *ret;
+	struct flash_layout *l;
+
+	ret = NULL;
+	for (l = layouts; l->id != NULL; l++){
+		if (strcasecmp(id, l->id) == 0) {
+			ret = l;
+			break;
+		}
+	};
+
+	return ret;
+}
+
+/*
+ * Display usage
+ */
+static void usage(int status)
+{
+	FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
+
+	fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
+	fprintf(stream,
+"\n"
+"Options:\n"
+"  -B <board>      create image for the board specified with <board>\n"
+"  -H <hwid>       use hardware id specified with <hwid>\n"
+"  -F <id>         use flash layout specified with <id>\n"
+"  -f <file>       read firmware image from the file <file>\n"
+"  -o <file>       write output to the file <file>\n"
+"  -i              inspect given firmware file (requires -f)\n"
+"  -x              extract combined kernel and rootfs while inspecting (implies -i)\n"
+"  -h              show this screen\n"
+	);
+
+	exit(status);
+}
+
+/*
+ * Get file statistics
+ */
+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;
+	return 0;
+}
+
+/*
+ * Read file into buffer
+ */
+static int read_to_buf(struct file_info *fdata, uint8_t *buf)
+{
+	FILE *f;
+	int ret = EXIT_FAILURE;
+
+	f = fopen(fdata->file_name, "rb");
+	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;
+}
+
+/*
+ * Check command line options
+ */
+static int check_options(void)
+{
+	int ret;
+
+	if (firmware_info.file_name == NULL) {
+		ERR("no firmware image specified");
+		return -1;
+	}
+
+	ret = get_file_stat(&firmware_info);
+	if (ret)
+		return ret;
+
+	if (inspect)
+		return 0;
+
+	if (board_id == NULL && opt_hw_id == NULL) {
+		ERR("either board or hardware id must be specified");
+		return -1;
+	}
+
+	if (board_id) {
+		board = find_board(board_id);
+		if (board == NULL) {
+			ERR("unknown/unsupported board id \"%s\"", board_id);
+			return -1;
+		}
+		if (layout_id == NULL) {
+			layout_id = board->layout_id;
+		}
+		hw_id = board->hw_id;
+	} else {
+		hw_id = strtoul(opt_hw_id, NULL, 0);
+		board = find_board_by_hwid(hw_id);
+		if (layout_id == NULL) {
+			layout_id = board->layout_id;
+		}
+	}
+
+	layout = find_layout(layout_id);
+	if (layout == NULL) {
+		ERR("unknown flash layout \"%s\"", layout_id);
+		return -1;
+	}
+
+	firmware_len = firmware_info.file_size;
+
+	if (firmware_info.file_size >
+		layout->fw_max_len - sizeof (struct fw_header)) {
+		ERR("firmware image is too big");
+		return -1;
+	}
+
+	if (ofname == NULL) {
+		ERR("no output file specified");
+		return -1;
+	}
+	return 0;
+}
+
+/*
+ * Fill in firmware header
+ */
+static void fill_header(uint8_t *buf)
+{
+	struct fw_header *hdr = (struct fw_header *) buf;
+
+	memset(hdr, 0, sizeof (struct fw_header));
+	hdr->hw_id = HOST_TO_LE32(hw_id);
+	hdr->firmware_len = HOST_TO_LE32(firmware_len);
+	hdr->flags = HOST_TO_LE32(HEADER_FLAGS);
+}
+
+/*
+ * Compute firmware checksum
+ */
+static uint16_t checksum_fw(uint8_t *data, int len)
+{
+	int i;
+	int32_t checksum = 0;
+
+	for (i = 0; i < len - 1; i += 2) {
+		checksum += (data[i + 1] << 8) | data[i];
+	}
+	if (i < len) {
+		checksum += data[i];
+	}
+	checksum = checksum + (checksum >> 16) + 0xffff;
+	checksum = ~(checksum + (checksum >> 16)) & 0xffff;
+	return (uint16_t) checksum;
+}
+
+/*
+ * (De)obfuscate firmware using an XOR operation with a fixed length key
+ */
+static void xor_fw(uint8_t *data, int len)
+{
+	int i;
+
+	for (i = 0; i <= len; i++) {
+		data[i] ^= key[board->key][i % KEY_LEN];
+	}
+}
+
+/*
+ * Write firmware to file
+ */
+static int write_fw(uint8_t *data, int len)
+{
+	FILE *f;
+	int ret = EXIT_FAILURE;
+
+	f = fopen(ofname, "wb");
+	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;
+}
+
+/*
+ * Build firmware file
+ */
+static int build_fw(void)
+{
+	int buflen;
+	uint8_t *buf, *p;
+	int ret = EXIT_FAILURE;
+	int writelen = 0;
+	uint16_t checksum;
+
+	buflen = layout->fw_max_len;
+
+	buf = (uint8_t *) malloc(buflen);
+	if (!buf) {
+		ERR("no memory for buffer\n");
+		goto out;
+	}
+
+	memset(buf, 0xff, buflen);
+	p = buf + sizeof (struct fw_header);
+	ret = read_to_buf(&firmware_info, p);
+	if (ret) {
+		goto out_free_buf;
+	}
+	writelen = sizeof (struct fw_header) + firmware_len + 2;
+
+	/* Fill in header */
+	fill_header(buf);
+
+	/* Compute firmware checksum */
+	checksum = checksum_fw(buf + sizeof (struct fw_header), firmware_len);
+
+	/* Cannot use network order function because checksum is not word-aligned */
+	buf[writelen - 1] = checksum >> 8;
+	buf[writelen - 2] = checksum & 0xff;
+
+	/* XOR obfuscate firmware */
+	xor_fw(buf + sizeof (struct fw_header), firmware_len + 2);
+
+	/* Write firmware file */
+	ret = write_fw(buf, writelen);
+	if (ret) {
+		goto out_free_buf;
+	}
+	ret = EXIT_SUCCESS;
+
+ out_free_buf:
+	free(buf);
+ out:
+	return ret;
+}
+
+/* Helper functions to inspect_fw() representing different output formats */
+static inline void inspect_fw_pstr(char *label, char *str)
+{
+	printf("%-23s: %s\n", label, str);
+}
+
+static inline void inspect_fw_phex(char *label, uint32_t val)
+{
+	printf("%-23s: 0x%08x\n", label, val);
+}
+
+static inline void inspect_fw_phexpost(char *label,
+                                       uint32_t val, char *post)
+{
+	printf("%-23s: 0x%08x (%s)\n", label, val, post);
+}
+
+static inline void inspect_fw_phexdef(char *label,
+                                      uint32_t val, uint32_t defval)
+{
+	printf("%-23s: 0x%08x                  ", label, val);
+
+	if (val == defval) {
+		printf("(== OpenWrt default)\n");
+	} else {
+		printf("(OpenWrt default: 0x%08x)\n", defval);
+	}
+}
+
+static inline void inspect_fw_phexexp(char *label,
+                                      uint32_t val, uint32_t expval)
+{
+	printf("%-23s: 0x%08x ", label, val);
+
+	if (val == expval) {
+		printf("(ok)\n");
+	} else {
+		printf("(expected: 0x%08x)\n", expval);
+	}
+}
+
+static inline void inspect_fw_phexdec(char *label, uint32_t val)
+{
+	printf("%-23s: 0x%08x / %8u bytes\n", label, val, val);
+}
+
+static inline void inspect_fw_pchecksum(char *label,
+					uint16_t val, uint16_t expval)
+{
+	printf("%-23s: 0x%04x     ", label, val);
+	if (val == expval) {
+		printf("(ok)\n");
+	} else {
+		printf("(expected: 0x%04x)\n", expval);
+	}
+}
+
+static int inspect_fw(void)
+{
+	uint8_t *buf;
+	struct fw_header *hdr;
+	int ret = EXIT_FAILURE;
+	uint16_t computed_checksum, file_checksum;
+
+	buf = (uint8_t *) malloc(firmware_info.file_size);
+	if (!buf) {
+		ERR("no memory for buffer!\n");
+		goto out;
+	}
+
+	ret = read_to_buf(&firmware_info, buf);
+	if (ret) {
+		goto out_free_buf;
+	}
+	hdr = (struct fw_header *)buf;
+
+	inspect_fw_pstr("File name", firmware_info.file_name);
+	inspect_fw_phexdec("File size", firmware_info.file_size);
+
+	printf("\n");
+
+	inspect_fw_phexdec("Header size", sizeof (struct fw_header));
+	board = find_board_by_hwid(LE32_TO_HOST(hdr->hw_id));
+	if (board) {
+		layout = find_layout(board->layout_id);
+		inspect_fw_phexpost("Hardware ID",
+				    LE32_TO_HOST( hdr->hw_id), board->id);
+	} else {
+		inspect_fw_phexpost("Hardware ID",
+		                    LE32_TO_HOST(hdr->hw_id), "unknown");
+	}
+	inspect_fw_phexdec("Firmware data length",
+	                   LE32_TO_HOST(hdr->firmware_len));
+
+	inspect_fw_phexexp("Flags",
+			   LE32_TO_HOST(hdr->flags), HEADER_FLAGS);
+	printf("\n");
+
+	/* XOR unobfuscate firmware */
+	xor_fw(buf + sizeof (struct fw_header), LE32_TO_HOST(hdr->firmware_len) + 2);
+
+	/* Compute firmware checksum */
+	computed_checksum = checksum_fw(buf + sizeof (struct fw_header), LE32_TO_HOST(hdr->firmware_len));
+
+	/* Cannot use network order function because checksum is not word-aligned */
+	file_checksum = (buf[firmware_info.file_size - 1] << 8) | buf[firmware_info.file_size - 2];
+	inspect_fw_pchecksum("Firmware checksum", computed_checksum, file_checksum);
+
+	/* Verify checksum */
+	if (computed_checksum != file_checksum) {
+		ret = -1;
+		ERR("checksums do not match");
+		goto out_free_buf;
+	}
+
+	printf("\n");
+
+	if (extract) {
+		FILE *fp;
+		char *filename;
+
+		if (ofname == NULL) {
+			filename = malloc(strlen(firmware_info.file_name) + 10);
+			sprintf(filename, "%s-firmware", firmware_info.file_name);
+		} else {
+			filename = ofname;
+		}
+		printf("Extracting firmware to \"%s\"...\n", filename);
+		fp = fopen(filename, "wb");
+		if (fp)	{
+		  if (!fwrite(buf + sizeof (struct fw_header),
+			            LE32_TO_HOST(hdr->firmware_len), 1, fp)) {
+				ERRS("error in fwrite(): %s", strerror(errno));
+			}
+			fclose(fp);
+		} else {
+			ERRS("error in fopen(): %s", strerror(errno));
+		}
+		if (ofname == NULL) {
+			free(filename);
+		}
+		printf("\n");
+	}
+
+ out_free_buf:
+	free(buf);
+ out:
+	return ret;
+}
+
+/*
+ * Main entry point
+ */
+int main(int argc, char *argv[])
+{
+	int ret = EXIT_FAILURE;
+
+	progname = basename(argv[0]);
+
+	int c;
+
+	while ((c = getopt(argc, argv, "B:H:F:f:o:ixh")) != -1) {
+		switch (c) {
+		case 'B':
+			board_id = optarg;
+			break;
+		case 'H':
+			opt_hw_id = optarg;
+			break;
+		case 'F':
+			layout_id = optarg;
+			break;
+		case 'f':
+			firmware_info.file_name = optarg;
+			break;
+		case 'o':
+			ofname = optarg;
+			break;
+		case 'i':
+			inspect = 1;
+			break;
+		case 'x':
+			inspect = 1;
+			extract = 1;
+			break;
+		case 'h':
+			usage(EXIT_SUCCESS);
+			break;
+		default:
+			usage(EXIT_FAILURE);
+			break;
+		}
+	}
+
+	ret = check_options();
+	if (ret) {
+		goto out;
+	}
+	if (!inspect) {
+		ret = build_fw();
+	} else {
+		ret = inspect_fw();
+	}
+
+ out:
+	return ret;
+}