mirror of https://github.com/hak5/openwrt-owl.git
oseama: small util for reading Seama image format info
It's similar to otrx, we need this tool for handling sysupgrade. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 48533owl
Rafał Miłecki
parent
2911212962
commit
92443f7041
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#
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# Copyright (C) 2016 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:=oseama
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk
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define Package/oseama
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SECTION:=utils
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CATEGORY:=Base system
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TITLE:=Utility for handling Seama firmware images
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MAINTAINER:=Rafał Miłecki <zajec5@gmail.com>
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DEPENDS:=@TARGET_bcm53xx
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endef
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define Package/oseama/description
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This package contains an utility that allows handling Seama 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="$(TARGET_CFLAGS) -Wall"
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endef
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define Package/oseama/install
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$(INSTALL_DIR) $(1)/usr/bin
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$(INSTALL_BIN) $(PKG_BUILD_DIR)/oseama $(1)/usr/bin/
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endef
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$(eval $(call BuildPackage,oseama))
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@ -0,0 +1,7 @@
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all: oseama
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oseama:
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$(CC) $(CFLAGS) -o $@ oseama.c -Wall
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clean:
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rm -f oseama
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@ -0,0 +1,237 @@
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/*
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* oseama
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*
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* Copyright (C) 2016 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 <byteswap.h>
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#include <endian.h>
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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 <string.h>
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#include <unistd.h>
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#if !defined(__BYTE_ORDER)
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#error "Unknown byte order"
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#endif
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define cpu_to_be32(x) (x)
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#define be32_to_cpu(x) (x)
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#define cpu_to_be16(x) (x)
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#define be16_to_cpu(x) (x)
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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#define cpu_to_be32(x) bswap_32(x)
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#define be32_to_cpu(x) bswap_32(x)
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#define cpu_to_be16(x) bswap_16(x)
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#define be16_to_cpu(x) bswap_16(x)
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#else
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#error "Unsupported endianness"
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#endif
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#define SEAMA_MAGIC 0x5ea3a417
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struct seama_seal_header {
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uint32_t magic;
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uint16_t reserved;
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uint16_t metasize;
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uint32_t imagesize;
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} __attribute__ ((packed));
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struct seama_entity_header {
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uint32_t magic;
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uint16_t reserved;
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uint16_t metasize;
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uint32_t imagesize;
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uint8_t md5[16];
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} __attribute__ ((packed));
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char *seama_path;
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int entity_idx = -1;
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static inline size_t oseama_min(size_t x, size_t y) {
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return x < y ? x : y;
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}
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/**************************************************
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* Info
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**************************************************/
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static void oseama_info_parse_options(int argc, char **argv) {
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int c;
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while ((c = getopt(argc, argv, "e:")) != -1) {
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switch (c) {
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case 'e':
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entity_idx = atoi(optarg);
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break;
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}
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}
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}
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static int oseama_info_entities(FILE *seama) {
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struct seama_entity_header hdr;
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size_t bytes, metasize, imagesize;
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uint8_t buf[1024];
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char *end, *tmp;
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int i = 0;
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int err = 0;
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while ((bytes = fread(&hdr, 1, sizeof(hdr), seama)) == sizeof(hdr)) {
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if (be32_to_cpu(hdr.magic) != SEAMA_MAGIC) {
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fprintf(stderr, "Invalid Seama magic: 0x%08x\n", be32_to_cpu(hdr.magic));
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err = -EINVAL;
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goto err_out;
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}
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metasize = be16_to_cpu(hdr.metasize);
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imagesize = be32_to_cpu(hdr.imagesize);
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if (entity_idx >= 0 && i != entity_idx) {
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fseek(seama, metasize + imagesize, SEEK_CUR);
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i++;
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continue;
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}
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if (metasize >= sizeof(buf)) {
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fprintf(stderr, "Too small buffer (%zu B) to read all meta info (%zd B)\n", sizeof(buf), metasize);
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err = -EINVAL;
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goto err_out;
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}
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if (entity_idx < 0)
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printf("\n");
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printf("Entity offset:\t%ld\n", ftell(seama) - sizeof(hdr));
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printf("Entity size:\t%zd\n", sizeof(hdr) + metasize + imagesize);
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printf("Meta size:\t%zd\n", metasize);
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printf("Image size:\t%zd\n", imagesize);
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bytes = fread(buf, 1, metasize, seama);
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if (bytes != metasize) {
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fprintf(stderr, "Couldn't read %zd B of meta\n", metasize);
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err = -EIO;
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goto err_out;
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}
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end = (char *)&buf[metasize - 1];
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*end = '\0';
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for (tmp = (char *)buf; tmp < end && strlen(tmp); tmp += strlen(tmp) + 1) {
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printf("Meta entry:\t%s\n", tmp);
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}
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fseek(seama, imagesize, SEEK_CUR);
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i++;
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}
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err_out:
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return err;
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}
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static int oseama_info(int argc, char **argv) {
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FILE *seama;
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struct seama_seal_header hdr;
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size_t bytes;
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uint16_t metasize;
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uint32_t imagesize;
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uint8_t buf[1024];
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int err = 0;
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if (argc < 3) {
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fprintf(stderr, "No Seama file passed\n");
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err = -EINVAL;
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goto out;
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}
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seama_path = argv[2];
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optind = 3;
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oseama_info_parse_options(argc, argv);
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seama = fopen(seama_path, "r");
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if (!seama) {
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fprintf(stderr, "Couldn't open %s\n", seama_path);
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err = -EACCES;
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goto out;
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}
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bytes = fread(&hdr, 1, sizeof(hdr), seama);
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if (bytes != sizeof(hdr)) {
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fprintf(stderr, "Couldn't read %s header\n", seama_path);
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err = -EIO;
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goto err_close;
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}
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metasize = be16_to_cpu(hdr.metasize);
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imagesize = be32_to_cpu(hdr.imagesize);
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if (be32_to_cpu(hdr.magic) != SEAMA_MAGIC) {
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fprintf(stderr, "Invalid Seama magic: 0x%08x\n", be32_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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if (metasize >= sizeof(buf)) {
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fprintf(stderr, "Too small buffer (%zu B) to read all meta info (%d B)\n", sizeof(buf), metasize);
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err = -EINVAL;
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goto err_close;
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}
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if (imagesize) {
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fprintf(stderr, "Invalid Seama image size: 0x%08x (should be 0)\n", imagesize);
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err = -EINVAL;
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goto err_close;
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}
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bytes = fread(buf, 1, metasize, seama);
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if (bytes != metasize) {
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fprintf(stderr, "Couldn't read %d B of meta\n", metasize);
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err = -EIO;
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goto err_close;
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}
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if (entity_idx < 0) {
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char *end, *tmp;
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printf("Meta size:\t%d\n", metasize);
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printf("Image size:\t%d\n", imagesize);
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end = (char *)&buf[metasize - 1];
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*end = '\0';
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for (tmp = (char *)buf; tmp < end && strlen(tmp); tmp += strlen(tmp) + 1) {
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printf("Meta entry:\t%s\n", tmp);
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}
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}
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oseama_info_entities(seama);
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err_close:
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fclose(seama);
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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 usage() {
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printf("Usage:\n");
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printf("\n");
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printf("Info about Seama seal (container):\n");
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printf("\toseama info <file> [options]\n");
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printf("\t-e\t\t\t\tprint info about specified entity only\n");
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}
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int main(int argc, char **argv) {
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if (argc > 1) {
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if (!strcmp(argv[1], "info"))
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return oseama_info(argc, argv);
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}
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usage();
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return 0;
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}
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