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: 48533

package/utils/oseama/Makefile

@@ -0,0 +1,43 @@
+#
+# Copyright (C) 2016 Rafał Miłecki <zajec5@gmail.com>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=oseama
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/oseama
+  SECTION:=utils
+  CATEGORY:=Base system
+  TITLE:=Utility for handling Seama firmware images
+  MAINTAINER:=Rafał Miłecki <zajec5@gmail.com>
+  DEPENDS:=@TARGET_bcm53xx
+endef
+
+define Package/oseama/description
+ This package contains an utility that allows handling Seama images.
+endef
+
+define Build/Prepare
+	mkdir -p $(PKG_BUILD_DIR)
+	$(CP) ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Compile
+	$(MAKE) -C $(PKG_BUILD_DIR) \
+		CC="$(TARGET_CC)" \
+		CFLAGS="$(TARGET_CFLAGS) -Wall"
+endef
+
+define Package/oseama/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/oseama $(1)/usr/bin/
+endef
+
+$(eval $(call BuildPackage,oseama))

package/utils/oseama/src/Makefile

@@ -0,0 +1,7 @@
+all: oseama
+
+oseama:
+	$(CC) $(CFLAGS) -o $@ oseama.c -Wall
+
+clean:
+	rm -f oseama

package/utils/oseama/src/oseama.c

@@ -0,0 +1,237 @@
+/*
+ * oseama
+ *
+ * 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 as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <byteswap.h>
+#include <endian.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.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
+
+#define SEAMA_MAGIC			0x5ea3a417
+
+struct seama_seal_header {
+	uint32_t magic;
+	uint16_t reserved;
+	uint16_t metasize;
+	uint32_t imagesize;
+} __attribute__ ((packed));
+
+struct seama_entity_header {
+	uint32_t magic;
+	uint16_t reserved;
+	uint16_t metasize;
+	uint32_t imagesize;
+	uint8_t md5[16];
+} __attribute__ ((packed));
+
+char *seama_path;
+int entity_idx = -1;
+
+static inline size_t oseama_min(size_t x, size_t y) {
+	return x < y ? x : y;
+}
+
+/**************************************************
+ * Info
+ **************************************************/
+
+static void oseama_info_parse_options(int argc, char **argv) {
+	int c;
+
+	while ((c = getopt(argc, argv, "e:")) != -1) {
+		switch (c) {
+		case 'e':
+			entity_idx = atoi(optarg);
+			break;
+		}
+	}
+}
+
+static int oseama_info_entities(FILE *seama) {
+	struct seama_entity_header hdr;
+	size_t bytes, metasize, imagesize;
+	uint8_t buf[1024];
+	char *end, *tmp;
+	int i = 0;
+	int err = 0;
+
+	while ((bytes = fread(&hdr, 1, sizeof(hdr), seama)) == sizeof(hdr)) {
+		if (be32_to_cpu(hdr.magic) != SEAMA_MAGIC) {
+			fprintf(stderr, "Invalid Seama magic: 0x%08x\n", be32_to_cpu(hdr.magic));
+			err =  -EINVAL;
+			goto err_out;
+		}
+		metasize = be16_to_cpu(hdr.metasize);
+		imagesize = be32_to_cpu(hdr.imagesize);
+
+		if (entity_idx >= 0 && i != entity_idx) {
+			fseek(seama, metasize + imagesize, SEEK_CUR);
+			i++;
+			continue;
+		}
+
+		if (metasize >= sizeof(buf)) {
+			fprintf(stderr, "Too small buffer (%zu B) to read all meta info (%zd B)\n", sizeof(buf), metasize);
+			err =  -EINVAL;
+			goto err_out;
+		}
+
+		if (entity_idx < 0)
+			printf("\n");
+		printf("Entity offset:\t%ld\n", ftell(seama) - sizeof(hdr));
+		printf("Entity size:\t%zd\n", sizeof(hdr) + metasize + imagesize);
+		printf("Meta size:\t%zd\n", metasize);
+		printf("Image size:\t%zd\n", imagesize);
+
+		bytes = fread(buf, 1, metasize, seama);
+		if (bytes != metasize) {
+			fprintf(stderr, "Couldn't read %zd B of meta\n", metasize);
+			err =  -EIO;
+			goto err_out;
+		}
+
+		end = (char *)&buf[metasize - 1];
+		*end = '\0';
+		for (tmp = (char *)buf; tmp < end && strlen(tmp); tmp += strlen(tmp) + 1) {
+			printf("Meta entry:\t%s\n", tmp);
+		}
+
+		fseek(seama, imagesize, SEEK_CUR);
+		i++;
+	}
+
+err_out:
+	return err;
+}
+
+static int oseama_info(int argc, char **argv) {
+	FILE *seama;
+	struct seama_seal_header hdr;
+	size_t bytes;
+	uint16_t metasize;
+	uint32_t imagesize;
+	uint8_t buf[1024];
+	int err = 0;
+
+	if (argc < 3) {
+		fprintf(stderr, "No Seama file passed\n");
+		err = -EINVAL;
+		goto out;
+	}
+	seama_path = argv[2];
+
+	optind = 3;
+	oseama_info_parse_options(argc, argv);
+
+	seama = fopen(seama_path, "r");
+	if (!seama) {
+		fprintf(stderr, "Couldn't open %s\n", seama_path);
+		err = -EACCES;
+		goto out;
+	}
+
+	bytes = fread(&hdr, 1, sizeof(hdr), seama);
+	if (bytes != sizeof(hdr)) {
+		fprintf(stderr, "Couldn't read %s header\n", seama_path);
+		err =  -EIO;
+		goto err_close;
+	}
+	metasize = be16_to_cpu(hdr.metasize);
+	imagesize = be32_to_cpu(hdr.imagesize);
+
+	if (be32_to_cpu(hdr.magic) != SEAMA_MAGIC) {
+		fprintf(stderr, "Invalid Seama magic: 0x%08x\n", be32_to_cpu(hdr.magic));
+		err =  -EINVAL;
+		goto err_close;
+	}
+
+	if (metasize >= sizeof(buf)) {
+		fprintf(stderr, "Too small buffer (%zu B) to read all meta info (%d B)\n", sizeof(buf), metasize);
+		err =  -EINVAL;
+		goto err_close;
+	}
+
+	if (imagesize) {
+		fprintf(stderr, "Invalid Seama image size: 0x%08x (should be 0)\n", imagesize);
+		err =  -EINVAL;
+		goto err_close;
+	}
+
+	bytes = fread(buf, 1, metasize, seama);
+	if (bytes != metasize) {
+		fprintf(stderr, "Couldn't read %d B of meta\n", metasize);
+		err =  -EIO;
+		goto err_close;
+	}
+
+	if (entity_idx < 0) {
+		char *end, *tmp;
+
+		printf("Meta size:\t%d\n", metasize);
+		printf("Image size:\t%d\n", imagesize);
+
+		end = (char *)&buf[metasize - 1];
+		*end = '\0';
+		for (tmp = (char *)buf; tmp < end && strlen(tmp); tmp += strlen(tmp) + 1) {
+			printf("Meta entry:\t%s\n", tmp);
+		}
+	}
+
+	oseama_info_entities(seama);
+
+err_close:
+	fclose(seama);
+out:
+	return err;
+}
+
+/**************************************************
+ * Start
+ **************************************************/
+
+static void usage() {
+	printf("Usage:\n");
+	printf("\n");
+	printf("Info about Seama seal (container):\n");
+	printf("\toseama info <file> [options]\n");
+	printf("\t-e\t\t\t\tprint info about specified entity only\n");
+}
+
+int main(int argc, char **argv) {
+	if (argc > 1) {
+		if (!strcmp(argv[1], "info"))
+			return oseama_info(argc, argv);
+	}
+
+	usage();
+	return 0;
+}