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557 lines
12 KiB
C
557 lines
12 KiB
C
/*
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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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#include "md5.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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char *out_path;
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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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* Create
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**************************************************/
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static ssize_t oseama_entity_append_file(FILE *seama, const char *in_path) {
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FILE *in;
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size_t bytes;
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ssize_t length = 0;
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uint8_t buf[128];
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in = fopen(in_path, "r");
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if (!in) {
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fprintf(stderr, "Couldn't open %s\n", in_path);
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return -EACCES;
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}
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while ((bytes = fread(buf, 1, sizeof(buf), in)) > 0) {
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if (fwrite(buf, 1, bytes, seama) != bytes) {
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fprintf(stderr, "Couldn't write %zu B to %s\n", bytes, seama_path);
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length = -EIO;
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break;
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}
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length += bytes;
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}
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fclose(in);
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return length;
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}
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static ssize_t oseama_entity_append_zeros(FILE *seama, size_t length) {
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uint8_t *buf;
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buf = malloc(length);
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if (!buf)
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return -ENOMEM;
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memset(buf, 0, length);
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if (fwrite(buf, 1, length, seama) != length) {
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fprintf(stderr, "Couldn't write %zu B to %s\n", length, seama_path);
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return -EIO;
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}
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return length;
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}
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static ssize_t oseama_entity_align(FILE *seama, size_t curr_offset, size_t alignment) {
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if (curr_offset & (alignment - 1)) {
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size_t length = alignment - (curr_offset % alignment);
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return oseama_entity_append_zeros(seama, length);
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}
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return 0;
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}
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static int oseama_entity_write_hdr(FILE *seama, size_t metasize, size_t imagesize) {
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struct seama_entity_header hdr = {};
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uint8_t buf[128];
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size_t length = imagesize;
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size_t bytes;
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MD5_CTX ctx;
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fseek(seama, sizeof(hdr) + metasize, SEEK_SET);
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MD5_Init(&ctx);
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while ((bytes = fread(buf, 1, oseama_min(sizeof(buf), length), seama)) > 0) {
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MD5_Update(&ctx, buf, bytes);
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length -= bytes;
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}
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MD5_Final(hdr.md5, &ctx);
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hdr.magic = cpu_to_be32(SEAMA_MAGIC);
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hdr.metasize = cpu_to_be16(metasize);
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hdr.imagesize = cpu_to_be32(imagesize);
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fseek(seama, 0, SEEK_SET);
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bytes = fwrite(&hdr, 1, sizeof(hdr), seama);
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if (bytes != sizeof(hdr)) {
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fprintf(stderr, "Couldn't write Seama entity header to %s\n", seama_path);
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return -EIO;
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}
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return 0;
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}
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static int oseama_entity(int argc, char **argv) {
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FILE *seama;
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ssize_t sbytes;
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size_t curr_offset = sizeof(struct seama_entity_header);
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size_t metasize = 0, imagesize = 0;
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int c;
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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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seama = fopen(seama_path, "w+");
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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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fseek(seama, curr_offset, SEEK_SET);
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optind = 3;
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while ((c = getopt(argc, argv, "m:f:b:")) != -1) {
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switch (c) {
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case 'm':
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sbytes = fwrite(optarg, 1, strlen(optarg) + 1, seama);
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if (sbytes < 0) {
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fprintf(stderr, "Failed to write meta %s\n", optarg);
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} else {
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curr_offset += sbytes;
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metasize += sbytes;
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}
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sbytes = oseama_entity_align(seama, curr_offset, 4);
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if (sbytes < 0) {
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fprintf(stderr, "Failed to append zeros\n");
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} else {
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curr_offset += sbytes;
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metasize += sbytes;
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}
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break;
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case 'f':
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case 'b':
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break;
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}
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}
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optind = 3;
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while ((c = getopt(argc, argv, "m:f:b:")) != -1) {
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switch (c) {
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case 'm':
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break;
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case 'f':
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sbytes = oseama_entity_append_file(seama, optarg);
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if (sbytes < 0) {
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fprintf(stderr, "Failed to append file %s\n", optarg);
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} else {
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curr_offset += sbytes;
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imagesize += sbytes;
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}
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break;
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case 'b':
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sbytes = strtol(optarg, NULL, 0) - curr_offset;
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if (sbytes < 0) {
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fprintf(stderr, "Current Seama entity length is 0x%zx, can't pad it with zeros to 0x%lx\n", curr_offset, strtol(optarg, NULL, 0));
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} else {
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sbytes = oseama_entity_append_zeros(seama, sbytes);
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if (sbytes < 0) {
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fprintf(stderr, "Failed to append zeros\n");
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} else {
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curr_offset += sbytes;
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imagesize += sbytes;
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}
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}
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break;
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}
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if (err)
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break;
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}
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oseama_entity_write_hdr(seama, metasize, imagesize);
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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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* Extract
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**************************************************/
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static void oseama_extract_parse_options(int argc, char **argv) {
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int c;
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while ((c = getopt(argc, argv, "e:o:")) != -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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case 'o':
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out_path = 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_extract_entity(FILE *seama, FILE *out) {
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struct seama_entity_header hdr;
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size_t bytes, metasize, imagesize, length;
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uint8_t buf[1024];
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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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break;
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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 (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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fseek(seama, -sizeof(hdr), SEEK_CUR);
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length = sizeof(hdr) + metasize + imagesize;
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while ((bytes = fread(buf, 1, oseama_min(sizeof(buf), length), seama)) > 0) {
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if (fwrite(buf, 1, bytes, out) != bytes) {
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fprintf(stderr, "Couldn't write %zu B to %s\n", bytes, out_path);
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err = -EIO;
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break;
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}
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length -= bytes;
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}
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if (length) {
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fprintf(stderr, "Couldn't extract whole entity %d from %s (%zu B left)\n", entity_idx, seama_path, length);
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err = -EIO;
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break;
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}
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break;
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}
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return err;
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}
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static int oseama_extract(int argc, char **argv) {
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FILE *seama;
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FILE *out;
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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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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_extract_parse_options(argc, argv);
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if (entity_idx < 0) {
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fprintf(stderr, "No entity specified\n");
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err = -EINVAL;
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goto out;
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} else if (!out_path) {
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fprintf(stderr, "No output file specified\n");
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err = -EINVAL;
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goto out;
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}
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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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out = fopen(out_path, "w");
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if (!out) {
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fprintf(stderr, "Couldn't open %s\n", out_path);
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err = -EACCES;
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goto err_close_seama;
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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_out;
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}
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metasize = be16_to_cpu(hdr.metasize);
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fseek(seama, metasize, SEEK_CUR);
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oseama_extract_entity(seama, out);
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err_close_out:
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fclose(out);
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err_close_seama:
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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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printf("\n");
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printf("Create Seama entity:\n");
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printf("\toseama entity <file> [options]\n");
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printf("\t-m meta\t\t\t\tmeta into to put in header\n");
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printf("\t-f file\t\t\t\tappend content from file\n");
|
|
printf("\t-b offset\t\t\tappend zeros till reaching absolute offset\n");
|
|
printf("\n");
|
|
printf("Extract from Seama seal (container):\n");
|
|
printf("\toseama extract <file> [options]\n");
|
|
printf("\t-e\t\t\t\tindex of entity 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 oseama_info(argc, argv);
|
|
else if (!strcmp(argv[1], "entity"))
|
|
return oseama_entity(argc, argv);
|
|
else if (!strcmp(argv[1], "extract"))
|
|
return oseama_extract(argc, argv);
|
|
}
|
|
|
|
usage();
|
|
return 0;
|
|
}
|