osafeloader: new util for extracting partitions from SafeLoader

SafeLoader is image format used by some TP-LINK devices. This tool
allows extracting selected partitions out of it. It can be used for
sysupgrade.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

5 files changed, 649 insertions, 0 deletions

diff --git a/package/utils/osafeloader/Makefile b/package/utils/osafeloader/Makefile
new file mode 100644
index 0000000000..883d7ae603
--- /dev/null
+++ b/package/utils/osafeloader/Makefile
@@ -0,0 +1,38 @@
+#
+# Copyright (C) 2016 Rafał Miłecki <rafal@milecki.pl>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=osafeloader
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/osafeloader
+  SECTION:=utils
+  CATEGORY:=Base system
+  TITLE:=Utility for handling TP-LINK SafeLoader images
+  MAINTAINER:=Rafał Miłecki <rafal@milecki.pl>
+  DEPENDS:=@TARGET_bcm53xx
+endef
+
+define Package/osafeloader/description
+ This package contains an utility that allows handling SafeLoader images.
+endef
+
+define Build/Compile
+	$(MAKE) -C $(PKG_BUILD_DIR) \
+		CC="$(TARGET_CC)" \
+		CFLAGS="$(TARGET_CFLAGS) -Wall"
+endef
+
+define Package/osafeloader/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/osafeloader $(1)/usr/bin/
+endef
+
+$(eval $(call BuildPackage,osafeloader))
diff --git a/package/utils/osafeloader/src/Makefile b/package/utils/osafeloader/src/Makefile
new file mode 100644
index 0000000000..acc6f0fe65
--- /dev/null
+++ b/package/utils/osafeloader/src/Makefile
@@ -0,0 +1,7 @@
+all: osafeloader
+
+osafeloader:
+	$(CC) $(CFLAGS) -Wall osafeloader.c md5.c -o $@ $^
+
+clean:
+	rm -f osafeloader
diff --git a/package/utils/osafeloader/src/md5.c b/package/utils/osafeloader/src/md5.c
new file mode 100644
index 0000000000..52d96accd3
--- /dev/null
+++ b/package/utils/osafeloader/src/md5.c
@@ -0,0 +1,296 @@
+/*
+ * This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
+ * MD5 Message-Digest Algorithm (RFC 1321).
+ *
+ * Homepage:
+ * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
+ *
+ * Author:
+ * Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
+ *
+ * This software was written by Alexander Peslyak in 2001.  No copyright is
+ * claimed, and the software is hereby placed in the public domain.
+ * In case this attempt to disclaim copyright and place the software in the
+ * public domain is deemed null and void, then the software is
+ * Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
+ * general public under the following terms:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted.
+ *
+ * There's ABSOLUTELY NO WARRANTY, express or implied.
+ *
+ * (This is a heavily cut-down "BSD license".)
+ *
+ * This differs from Colin Plumb's older public domain implementation in that
+ * no exactly 32-bit integer data type is required (any 32-bit or wider
+ * unsigned integer data type will do), there's no compile-time endianness
+ * configuration, and the function prototypes match OpenSSL's.  No code from
+ * Colin Plumb's implementation has been reused; this comment merely compares
+ * the properties of the two independent implementations.
+ *
+ * The primary goals of this implementation are portability and ease of use.
+ * It is meant to be fast, but not as fast as possible.  Some known
+ * optimizations are not included to reduce source code size and avoid
+ * compile-time configuration.
+ */
+
+#ifndef HAVE_OPENSSL
+
+#include <string.h>
+
+#include "md5.h"
+
+/*
+ * The basic MD5 functions.
+ *
+ * F and G are optimized compared to their RFC 1321 definitions for
+ * architectures that lack an AND-NOT instruction, just like in Colin Plumb's
+ * implementation.
+ */
+#define F(x, y, z)			((z) ^ ((x) & ((y) ^ (z))))
+#define G(x, y, z)			((y) ^ ((z) & ((x) ^ (y))))
+#define H(x, y, z)			(((x) ^ (y)) ^ (z))
+#define H2(x, y, z)			((x) ^ ((y) ^ (z)))
+#define I(x, y, z)			((y) ^ ((x) | ~(z)))
+
+/*
+ * The MD5 transformation for all four rounds.
+ */
+#define STEP(f, a, b, c, d, x, t, s) \
+	(a) += f((b), (c), (d)) + (x) + (t); \
+	(a) = (((a) << (s)) | (((a) & 0xffffffff) >> (32 - (s)))); \
+	(a) += (b);
+
+/*
+ * SET reads 4 input bytes in little-endian byte order and stores them
+ * in a properly aligned word in host byte order.
+ *
+ * The check for little-endian architectures that tolerate unaligned
+ * memory accesses is just an optimization.  Nothing will break if it
+ * doesn't work.
+ */
+#if defined(__i386__) || defined(__x86_64__) || defined(__vax__)
+#define SET(n) \
+	(*(MD5_u32plus *)&ptr[(n) * 4])
+#define GET(n) \
+	SET(n)
+#else
+#define SET(n) \
+	(ctx->block[(n)] = \
+	(MD5_u32plus)ptr[(n) * 4] | \
+	((MD5_u32plus)ptr[(n) * 4 + 1] << 8) | \
+	((MD5_u32plus)ptr[(n) * 4 + 2] << 16) | \
+	((MD5_u32plus)ptr[(n) * 4 + 3] << 24))
+#define GET(n) \
+	(ctx->block[(n)])
+#endif
+
+/*
+ * This processes one or more 64-byte data blocks, but does NOT update
+ * the bit counters.  There are no alignment requirements.
+ */
+static const void *body(MD5_CTX *ctx, const void *data, unsigned long size)
+{
+	const unsigned char *ptr;
+	MD5_u32plus a, b, c, d;
+	MD5_u32plus saved_a, saved_b, saved_c, saved_d;
+
+	ptr = (const unsigned char *)data;
+
+	a = ctx->a;
+	b = ctx->b;
+	c = ctx->c;
+	d = ctx->d;
+
+	do {
+		saved_a = a;
+		saved_b = b;
+		saved_c = c;
+		saved_d = d;
+
+/* Round 1 */
+		STEP(F, a, b, c, d, SET(0), 0xd76aa478, 7)
+		STEP(F, d, a, b, c, SET(1), 0xe8c7b756, 12)
+		STEP(F, c, d, a, b, SET(2), 0x242070db, 17)
+		STEP(F, b, c, d, a, SET(3), 0xc1bdceee, 22)
+		STEP(F, a, b, c, d, SET(4), 0xf57c0faf, 7)
+		STEP(F, d, a, b, c, SET(5), 0x4787c62a, 12)
+		STEP(F, c, d, a, b, SET(6), 0xa8304613, 17)
+		STEP(F, b, c, d, a, SET(7), 0xfd469501, 22)
+		STEP(F, a, b, c, d, SET(8), 0x698098d8, 7)
+		STEP(F, d, a, b, c, SET(9), 0x8b44f7af, 12)
+		STEP(F, c, d, a, b, SET(10), 0xffff5bb1, 17)
+		STEP(F, b, c, d, a, SET(11), 0x895cd7be, 22)
+		STEP(F, a, b, c, d, SET(12), 0x6b901122, 7)
+		STEP(F, d, a, b, c, SET(13), 0xfd987193, 12)
+		STEP(F, c, d, a, b, SET(14), 0xa679438e, 17)
+		STEP(F, b, c, d, a, SET(15), 0x49b40821, 22)
+
+/* Round 2 */
+		STEP(G, a, b, c, d, GET(1), 0xf61e2562, 5)
+		STEP(G, d, a, b, c, GET(6), 0xc040b340, 9)
+		STEP(G, c, d, a, b, GET(11), 0x265e5a51, 14)
+		STEP(G, b, c, d, a, GET(0), 0xe9b6c7aa, 20)
+		STEP(G, a, b, c, d, GET(5), 0xd62f105d, 5)
+		STEP(G, d, a, b, c, GET(10), 0x02441453, 9)
+		STEP(G, c, d, a, b, GET(15), 0xd8a1e681, 14)
+		STEP(G, b, c, d, a, GET(4), 0xe7d3fbc8, 20)
+		STEP(G, a, b, c, d, GET(9), 0x21e1cde6, 5)
+		STEP(G, d, a, b, c, GET(14), 0xc33707d6, 9)
+		STEP(G, c, d, a, b, GET(3), 0xf4d50d87, 14)
+		STEP(G, b, c, d, a, GET(8), 0x455a14ed, 20)
+		STEP(G, a, b, c, d, GET(13), 0xa9e3e905, 5)
+		STEP(G, d, a, b, c, GET(2), 0xfcefa3f8, 9)
+		STEP(G, c, d, a, b, GET(7), 0x676f02d9, 14)
+		STEP(G, b, c, d, a, GET(12), 0x8d2a4c8a, 20)
+
+/* Round 3 */
+		STEP(H, a, b, c, d, GET(5), 0xfffa3942, 4)
+		STEP(H2, d, a, b, c, GET(8), 0x8771f681, 11)
+		STEP(H, c, d, a, b, GET(11), 0x6d9d6122, 16)
+		STEP(H2, b, c, d, a, GET(14), 0xfde5380c, 23)
+		STEP(H, a, b, c, d, GET(1), 0xa4beea44, 4)
+		STEP(H2, d, a, b, c, GET(4), 0x4bdecfa9, 11)
+		STEP(H, c, d, a, b, GET(7), 0xf6bb4b60, 16)
+		STEP(H2, b, c, d, a, GET(10), 0xbebfbc70, 23)
+		STEP(H, a, b, c, d, GET(13), 0x289b7ec6, 4)
+		STEP(H2, d, a, b, c, GET(0), 0xeaa127fa, 11)
+		STEP(H, c, d, a, b, GET(3), 0xd4ef3085, 16)
+		STEP(H2, b, c, d, a, GET(6), 0x04881d05, 23)
+		STEP(H, a, b, c, d, GET(9), 0xd9d4d039, 4)
+		STEP(H2, d, a, b, c, GET(12), 0xe6db99e5, 11)
+		STEP(H, c, d, a, b, GET(15), 0x1fa27cf8, 16)
+		STEP(H2, b, c, d, a, GET(2), 0xc4ac5665, 23)
+
+/* Round 4 */
+		STEP(I, a, b, c, d, GET(0), 0xf4292244, 6)
+		STEP(I, d, a, b, c, GET(7), 0x432aff97, 10)
+		STEP(I, c, d, a, b, GET(14), 0xab9423a7, 15)
+		STEP(I, b, c, d, a, GET(5), 0xfc93a039, 21)
+		STEP(I, a, b, c, d, GET(12), 0x655b59c3, 6)
+		STEP(I, d, a, b, c, GET(3), 0x8f0ccc92, 10)
+		STEP(I, c, d, a, b, GET(10), 0xffeff47d, 15)
+		STEP(I, b, c, d, a, GET(1), 0x85845dd1, 21)
+		STEP(I, a, b, c, d, GET(8), 0x6fa87e4f, 6)
+		STEP(I, d, a, b, c, GET(15), 0xfe2ce6e0, 10)
+		STEP(I, c, d, a, b, GET(6), 0xa3014314, 15)
+		STEP(I, b, c, d, a, GET(13), 0x4e0811a1, 21)
+		STEP(I, a, b, c, d, GET(4), 0xf7537e82, 6)
+		STEP(I, d, a, b, c, GET(11), 0xbd3af235, 10)
+		STEP(I, c, d, a, b, GET(2), 0x2ad7d2bb, 15)
+		STEP(I, b, c, d, a, GET(9), 0xeb86d391, 21)
+
+		a += saved_a;
+		b += saved_b;
+		c += saved_c;
+		d += saved_d;
+
+		ptr += 64;
+	} while (size -= 64);
+
+	ctx->a = a;
+	ctx->b = b;
+	ctx->c = c;
+	ctx->d = d;
+
+	return ptr;
+}
+
+void MD5_Init(MD5_CTX *ctx)
+{
+	ctx->a = 0x67452301;
+	ctx->b = 0xefcdab89;
+	ctx->c = 0x98badcfe;
+	ctx->d = 0x10325476;
+
+	ctx->lo = 0;
+	ctx->hi = 0;
+}
+
+void MD5_Update(MD5_CTX *ctx, const void *data, unsigned long size)
+{
+	MD5_u32plus saved_lo;
+	unsigned long used, available;
+
+	saved_lo = ctx->lo;
+	if ((ctx->lo = (saved_lo + size) & 0x1fffffff) < saved_lo)
+		ctx->hi++;
+	ctx->hi += size >> 29;
+
+	used = saved_lo & 0x3f;
+
+	if (used) {
+		available = 64 - used;
+
+		if (size < available) {
+			memcpy(&ctx->buffer[used], data, size);
+			return;
+		}
+
+		memcpy(&ctx->buffer[used], data, available);
+		data = (const unsigned char *)data + available;
+		size -= available;
+		body(ctx, ctx->buffer, 64);
+	}
+
+	if (size >= 64) {
+		data = body(ctx, data, size & ~(unsigned long)0x3f);
+		size &= 0x3f;
+	}
+
+	memcpy(ctx->buffer, data, size);
+}
+
+void MD5_Final(unsigned char *result, MD5_CTX *ctx)
+{
+	unsigned long used, available;
+
+	used = ctx->lo & 0x3f;
+
+	ctx->buffer[used++] = 0x80;
+
+	available = 64 - used;
+
+	if (available < 8) {
+		memset(&ctx->buffer[used], 0, available);
+		body(ctx, ctx->buffer, 64);
+		used = 0;
+		available = 64;
+	}
+
+	memset(&ctx->buffer[used], 0, available - 8);
+
+	ctx->lo <<= 3;
+	ctx->buffer[56] = ctx->lo;
+	ctx->buffer[57] = ctx->lo >> 8;
+	ctx->buffer[58] = ctx->lo >> 16;
+	ctx->buffer[59] = ctx->lo >> 24;
+	ctx->buffer[60] = ctx->hi;
+	ctx->buffer[61] = ctx->hi >> 8;
+	ctx->buffer[62] = ctx->hi >> 16;
+	ctx->buffer[63] = ctx->hi >> 24;
+
+	body(ctx, ctx->buffer, 64);
+
+	result[0] = ctx->a;
+	result[1] = ctx->a >> 8;
+	result[2] = ctx->a >> 16;
+	result[3] = ctx->a >> 24;
+	result[4] = ctx->b;
+	result[5] = ctx->b >> 8;
+	result[6] = ctx->b >> 16;
+	result[7] = ctx->b >> 24;
+	result[8] = ctx->c;
+	result[9] = ctx->c >> 8;
+	result[10] = ctx->c >> 16;
+	result[11] = ctx->c >> 24;
+	result[12] = ctx->d;
+	result[13] = ctx->d >> 8;
+	result[14] = ctx->d >> 16;
+	result[15] = ctx->d >> 24;
+
+	memset(ctx, 0, sizeof(*ctx));
+}
+
+#endif
diff --git a/package/utils/osafeloader/src/md5.h b/package/utils/osafeloader/src/md5.h
new file mode 100644
index 0000000000..2da44bf355
--- /dev/null
+++ b/package/utils/osafeloader/src/md5.h
@@ -0,0 +1,45 @@
+/*
+ * This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
+ * MD5 Message-Digest Algorithm (RFC 1321).
+ *
+ * Homepage:
+ * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
+ *
+ * Author:
+ * Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
+ *
+ * This software was written by Alexander Peslyak in 2001.  No copyright is
+ * claimed, and the software is hereby placed in the public domain.
+ * In case this attempt to disclaim copyright and place the software in the
+ * public domain is deemed null and void, then the software is
+ * Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
+ * general public under the following terms:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted.
+ *
+ * There's ABSOLUTELY NO WARRANTY, express or implied.
+ *
+ * See md5.c for more information.
+ */
+
+#ifdef HAVE_OPENSSL
+#include <openssl/md5.h>
+#elif !defined(_MD5_H)
+#define _MD5_H
+
+/* Any 32-bit or wider unsigned integer data type will do */
+typedef unsigned int MD5_u32plus;
+
+typedef struct {
+	MD5_u32plus lo, hi;
+	MD5_u32plus a, b, c, d;
+	unsigned char buffer[64];
+	MD5_u32plus block[16];
+} MD5_CTX;
+
+extern void MD5_Init(MD5_CTX *ctx);
+extern void MD5_Update(MD5_CTX *ctx, const void *data, unsigned long size);
+extern void MD5_Final(unsigned char *result, MD5_CTX *ctx);
+
+#endif
diff --git a/package/utils/osafeloader/src/osafeloader.c b/package/utils/osafeloader/src/osafeloader.c
new file mode 100644
index 0000000000..9ffa5fe3cf
--- /dev/null
+++ b/package/utils/osafeloader/src/osafeloader.c
@@ -0,0 +1,263 @@
+/*
+ * osafeloader
+ *
+ * Copyright (C) 2016 Rafał Miłecki <zajec5@gmail.com>
+ *
+ * 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 <byteswap.h>
+#include <endian.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "md5.h"
+
+#if !defined(__BYTE_ORDER)
+#error "Unknown byte order"
+#endif
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define cpu_to_be32(x)	(x)
+#define be32_to_cpu(x)	(x)
+#define cpu_to_be16(x)	(x)
+#define be16_to_cpu(x)	(x)
+#elif __BYTE_ORDER == __LITTLE_ENDIAN
+#define cpu_to_be32(x)	bswap_32(x)
+#define be32_to_cpu(x)	bswap_32(x)
+#define cpu_to_be16(x)	bswap_16(x)
+#define be16_to_cpu(x)	bswap_16(x)
+#else
+#error "Unsupported endianness"
+#endif
+
+struct safeloader_header {
+	uint32_t imagesize;
+	uint8_t md5[16];
+} __attribute__ ((packed));
+
+char *safeloader_path;
+char *partition_name;
+char *out_path;
+
+static inline size_t osafeloader_min(size_t x, size_t y) {
+	return x < y ? x : y;
+}
+
+static const uint8_t md5_salt[16] = {
+	0x7a, 0x2b, 0x15, 0xed,
+	0x9b, 0x98, 0x59, 0x6d,
+	0xe5, 0x04, 0xab, 0x44,
+	0xac, 0x2a, 0x9f, 0x4e,
+};
+
+/**************************************************
+ * Info
+ **************************************************/
+
+static int osafeloader_info(int argc, char **argv) {
+	FILE *safeloader;
+	struct safeloader_header hdr;
+	MD5_CTX ctx;
+	size_t bytes, imagesize;
+	uint8_t buf[1024];
+	uint8_t md5[16];
+	char name[32];
+	int base, size, i;
+	int err = 0;
+
+	if (argc < 3) {
+		fprintf(stderr, "No SafeLoader file passed\n");
+		err = -EINVAL;
+		goto out;
+	}
+	safeloader_path = argv[2];
+
+	safeloader = fopen(safeloader_path, "r");
+	if (!safeloader) {
+		fprintf(stderr, "Couldn't open %s\n", safeloader_path);
+		err = -EACCES;
+		goto out;
+	}
+
+	bytes = fread(&hdr, 1, sizeof(hdr), safeloader);
+	if (bytes != sizeof(hdr)) {
+		fprintf(stderr, "Couldn't read %s header\n", safeloader_path);
+		err =  -EIO;
+		goto err_close;
+	}
+	imagesize = be32_to_cpu(hdr.imagesize);
+
+	MD5_Init(&ctx);
+	MD5_Update(&ctx, md5_salt, sizeof(md5_salt));
+	while ((bytes = fread(buf, 1, osafeloader_min(sizeof(buf), imagesize), safeloader)) > 0) {
+		MD5_Update(&ctx, buf, bytes);
+		imagesize -= bytes;
+	}
+	MD5_Final(md5, &ctx);
+
+	if (memcmp(md5, hdr.md5, 16)) {
+		fprintf(stderr, "Broken SafeLoader file with invalid MD5\n");
+		err =  -EIO;
+		goto err_close;
+	}
+
+	printf("%10s: %d\n", "Image size", be32_to_cpu(hdr.imagesize));
+	printf("%10s: ", "MD5");
+	for (i = 0; i < 16; i++)
+		printf("%02x", md5[i]);
+	printf("\n");
+
+	/* Skip header & vendor info */
+	fseek(safeloader, 0x1014, SEEK_SET);
+
+	while (fscanf(safeloader, "fwup-ptn %s base 0x%x size 0x%x\t\r\n", name, &base, &size) == 3) {
+		printf("%10s: %s (0x%x - 0x%x)\n", "Partition", name, base, base + size);
+	}
+
+err_close:
+	fclose(safeloader);
+out:
+	return err;
+}
+
+/**************************************************
+ * Extract
+ **************************************************/
+
+static void osafeloader_extract_parse_options(int argc, char **argv) {
+	int c;
+
+	while ((c = getopt(argc, argv, "p:o:")) != -1) {
+		switch (c) {
+		case 'p':
+			partition_name = optarg;
+			break;
+		case 'o':
+			out_path = optarg;
+			break;
+		}
+	}
+}
+
+static int osafeloader_extract(int argc, char **argv) {
+	FILE *safeloader;
+	FILE *out;
+	struct safeloader_header hdr;
+	size_t bytes;
+	char name[32];
+	int base, size;
+	int err = 0;
+
+	if (argc < 3) {
+		fprintf(stderr, "No SafeLoader file passed\n");
+		err = -EINVAL;
+		goto out;
+	}
+	safeloader_path = argv[2];
+
+	optind = 3;
+	osafeloader_extract_parse_options(argc, argv);
+	if (!partition_name) {
+		fprintf(stderr, "No partition name specified\n");
+		err = -EINVAL;
+		goto out;
+	} else if (!out_path) {
+		fprintf(stderr, "No output file specified\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	safeloader = fopen(safeloader_path, "r");
+	if (!safeloader) {
+		fprintf(stderr, "Couldn't open %s\n", safeloader_path);
+		err = -EACCES;
+		goto out;
+	}
+
+	out = fopen(out_path, "w");
+	if (!out) {
+		fprintf(stderr, "Couldn't open %s\n", out_path);
+		err = -EACCES;
+		goto err_close_safeloader;
+	}
+
+	bytes = fread(&hdr, 1, sizeof(hdr), safeloader);
+	if (bytes != sizeof(hdr)) {
+		fprintf(stderr, "Couldn't read %s header\n", safeloader_path);
+		err =  -EIO;
+		goto err_close_out;
+	}
+
+	/* Skip vendor info */
+	fseek(safeloader, 0x1000, SEEK_CUR);
+
+	err = -ENOENT;
+	while (fscanf(safeloader, "fwup-ptn %s base 0x%x size 0x%x\t\r\n", name, &base, &size) == 3) {
+		uint8_t buf[1024];
+
+		if (strcmp(name, partition_name))
+			continue;
+
+		err = 0;
+
+		fseek(safeloader, sizeof(hdr) + 0x1000 + base, SEEK_SET);
+
+		while ((bytes = fread(buf, 1, osafeloader_min(sizeof(buf), size), safeloader)) > 0) {
+			if (fwrite(buf, 1, bytes, out) != bytes) {
+				fprintf(stderr, "Couldn't write %zu B to %s\n", bytes, out_path);
+				err = -EIO;
+				break;
+			}
+			size -= bytes;
+		}
+
+		if (size) {
+			fprintf(stderr, "Couldn't extract whole partition %s from %s (%d B left)\n", partition_name, safeloader_path, size);
+			err = -EIO;
+		}
+
+		break;
+	}
+
+err_close_out:
+	fclose(out);
+err_close_safeloader:
+	fclose(safeloader);
+out:
+	return err;
+}
+
+/**************************************************
+ * Start
+ **************************************************/
+
+static void usage() {
+	printf("Usage:\n");
+	printf("\n");
+	printf("Info about SafeLoader:\n");
+	printf("\tosafeloader info <file>\n");
+	printf("\n");
+	printf("Extract from SafeLoader:\n");
+	printf("\tosafeloader extract <file> [options]\n");
+	printf("\t-p name\t\t\t\tname of partition to extract\n");
+	printf("\t-o file\t\t\t\toutput file\n");
+}
+
+int main(int argc, char **argv) {
+	if (argc > 1) {
+		if (!strcmp(argv[1], "info"))
+			return osafeloader_info(argc, argv);
+		else if (!strcmp(argv[1], "extract"))
+			return osafeloader_extract(argc, argv);
+	}
+
+	usage();
+	return 0;
+}