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/*
* 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;
}
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