mirror of https://github.com/hak5/openwrt-owl.git
otrx: new package with tiny app verifying TRX images
Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 45315owl
Rafał Miłecki
parent
1630498e4c
commit
71e6325ab8
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@ -0,0 +1,43 @@
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#
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# Copyright (C) 2015 Rafał Miłecki <zajec5@gmail.com>
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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PKG_NAME:=otrx
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk
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define Package/otrx
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SECTION:=utils
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CATEGORY:=Base system
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TITLE:=Utility for opening (analyzing) TRX firmware images
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MAINTAINER:=Rafał Miłecki <zajec5@gmail.com>
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DEPENDS:=@TARGET_brcm47xx||@TARGET_bcm53xx
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endef
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define Package/otrx/description
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This package contains an utility that allows validating TRX images.
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endef
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define Build/Prepare
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mkdir -p $(PKG_BUILD_DIR)
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$(CP) ./src/* $(PKG_BUILD_DIR)/
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endef
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define Build/Compile
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$(MAKE) -C $(PKG_BUILD_DIR) \
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CC="$(TARGET_CC)" \
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CFLAGS="$(TARGET_CFLAGS) -Wall"
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endef
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define Package/otrx/install
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$(INSTALL_DIR) $(1)/usr/bin
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$(INSTALL_BIN) $(PKG_BUILD_DIR)/otrx $(1)/usr/bin/
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endef
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$(eval $(call BuildPackage,otrx))
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@ -0,0 +1,7 @@
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all: otrx
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otrx:
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$(CC) $(CFLAGS) -o $@ otrx.c
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clean:
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rm -f otrx
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@ -0,0 +1,237 @@
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/*
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* otrx
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*
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* Copyright (C) 2015 Rafał Miłecki <zajec5@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define cpu_to_le32(x) bswap_32(x)
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#define le32_to_cpu(x) bswap_32(x)
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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#define cpu_to_le32(x) (x)
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#define le32_to_cpu(x) (x)
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#else
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#error "Unsupported endianness"
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#endif
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#define TRX_MAGIC 0x30524448
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#define TRX_FLAGS_OFFSET 12
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struct trx_header {
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uint32_t magic;
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uint32_t length;
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uint32_t crc32;
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uint16_t flags;
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uint16_t version;
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uint32_t offset[3];
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};
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enum mode {
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MODE_UNKNOWN,
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MODE_CHECK,
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};
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enum mode mode = MODE_UNKNOWN;
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char *trx_path;
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size_t trx_offset = 0;
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/**************************************************
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* CRC32
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**************************************************/
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uint32_t otrx_crc32(uint8_t *buf, size_t len) {
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static const uint32_t t[] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
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0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
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0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
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0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
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0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
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0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
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0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
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0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
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0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
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0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
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0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
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0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
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0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
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0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
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0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
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0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
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0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
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0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
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0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
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0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
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0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
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0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
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0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
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0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
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0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
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0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
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0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
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0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
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0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
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0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
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0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
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0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
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0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
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0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
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0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
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};
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uint32_t crc = 0xffffffff;
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while (len) {
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crc = t[(crc ^ *buf) & 0xff] ^ (crc >> 8);
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buf++;
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len--;
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}
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return crc;
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}
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/**************************************************
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* Check
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**************************************************/
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static int otrx_check() {
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FILE *trx;
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struct trx_header hdr;
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size_t bytes, length;
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uint8_t *buf;
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uint32_t crc32;
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int err = 0;
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trx = fopen(trx_path, "r");
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if (!trx) {
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fprintf(stderr, "Couldn't open %s\n", trx_path);
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err = -EACCES;
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goto out;
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}
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fseek(trx, trx_offset, SEEK_SET);
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bytes = fread(&hdr, 1, sizeof(hdr), trx);
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if (bytes != sizeof(hdr)) {
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fprintf(stderr, "Couldn't read %s header\n", trx_path);
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err = -EIO;
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goto err_close;
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}
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if (le32_to_cpu(hdr.magic) != TRX_MAGIC) {
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fprintf(stderr, "Invalid TRX magic: 0x%08x\n", le32_to_cpu(hdr.magic));
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err = -EINVAL;
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goto err_close;
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}
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length = le32_to_cpu(hdr.length);
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buf = malloc(length);
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if (!buf) {
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fprintf(stderr, "Couldn't alloc %d B buffer\n", length);
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err = -ENOMEM;
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goto err_close;
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}
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fseek(trx, trx_offset, SEEK_SET);
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bytes = fread(buf, 1, length, trx);
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if (bytes != length) {
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fprintf(stderr, "Couldn't read %d B of data from %s\n", length, trx_path);
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err = -ENOMEM;
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goto err_free_buf;
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}
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crc32 = otrx_crc32(buf + TRX_FLAGS_OFFSET, length - TRX_FLAGS_OFFSET);
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if (crc32 != le32_to_cpu(hdr.crc32)) {
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fprintf(stderr, "Invalid data crc32: 0x%08x instead of 0x%08x\n", crc32, le32_to_cpu(hdr.crc32));
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err = -EINVAL;
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goto err_free_buf;
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}
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printf("Found a valid TRX version %d\n", le32_to_cpu(hdr.version));
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err_free_buf:
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free(buf);
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err_close:
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fclose(trx);
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out:
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return err;
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}
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/**************************************************
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* Start
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**************************************************/
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static void parse_options(int argc, char **argv) {
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int c;
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while ((c = getopt(argc, argv, "c:o:")) != -1) {
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switch (c) {
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case 'c':
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mode = MODE_CHECK;
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trx_path = optarg;
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break;
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case 'o':
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trx_offset = atoi(optarg);
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break;
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}
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}
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}
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static void usage() {
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printf("Usage:\n");
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printf("\n");
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printf("Checking TRX file:\n");
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printf("\t-c file\t\tcheck if file is a valid TRX\n");
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printf("\t-o offset\toffset of TRX data in file (default: 0)\n");
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}
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int main(int argc, char **argv) {
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parse_options(argc, argv);
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switch (mode) {
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case MODE_CHECK:
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return otrx_check();
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default:
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usage();
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}
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return 0;
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}
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