--- /dev/null
+/*
+ * 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>
+
+#include "md5.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;
+}
+
+/**************************************************
+ * Create
+ **************************************************/
+
+static ssize_t oseama_entity_append_file(FILE *seama, const char *in_path) {
+ FILE *in;
+ size_t bytes;
+ ssize_t length = 0;
+ uint8_t buf[128];
+
+ in = fopen(in_path, "r");
+ if (!in) {
+ fprintf(stderr, "Couldn't open %s\n", in_path);
+ return -EACCES;
+ }
+
+ while ((bytes = fread(buf, 1, sizeof(buf), in)) > 0) {
+ if (fwrite(buf, 1, bytes, seama) != bytes) {
+ fprintf(stderr, "Couldn't write %zu B to %s\n", bytes, seama_path);
+ length = -EIO;
+ break;
+ }
+ length += bytes;
+ }
+
+ fclose(in);
+
+ return length;
+}
+
+static ssize_t oseama_entity_append_zeros(FILE *seama, size_t length) {
+ uint8_t *buf;
+
+ buf = malloc(length);
+ if (!buf)
+ return -ENOMEM;
+ memset(buf, 0, length);
+
+ if (fwrite(buf, 1, length, seama) != length) {
+ fprintf(stderr, "Couldn't write %zu B to %s\n", length, seama_path);
+ return -EIO;
+ }
+
+ return length;
+}
+
+static ssize_t oseama_entity_align(FILE *seama, size_t curr_offset, size_t alignment) {
+ if (curr_offset & (alignment - 1)) {
+ size_t length = alignment - (curr_offset % alignment);
+
+ return oseama_entity_append_zeros(seama, length);
+ }
+
+ return 0;
+}
+
+static int oseama_entity_write_hdr(FILE *seama, size_t metasize, size_t imagesize) {
+ struct seama_entity_header hdr = {};
+ uint8_t buf[128];
+ size_t length = imagesize;
+ size_t bytes;
+ MD5_CTX ctx;
+
+ fseek(seama, sizeof(hdr) + metasize, SEEK_SET);
+ MD5_Init(&ctx);
+ while ((bytes = fread(buf, 1, oseama_min(sizeof(buf), length), seama)) > 0) {
+ MD5_Update(&ctx, buf, bytes);
+ length -= bytes;
+ }
+ MD5_Final(hdr.md5, &ctx);
+
+ hdr.magic = cpu_to_be32(SEAMA_MAGIC);
+ hdr.metasize = cpu_to_be16(metasize);
+ hdr.imagesize = cpu_to_be32(imagesize);
+
+ fseek(seama, 0, SEEK_SET);
+ bytes = fwrite(&hdr, 1, sizeof(hdr), seama);
+ if (bytes != sizeof(hdr)) {
+ fprintf(stderr, "Couldn't write Seama entity header to %s\n", seama_path);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int oseama_entity(int argc, char **argv) {
+ FILE *seama;
+ ssize_t sbytes;
+ size_t curr_offset = sizeof(struct seama_entity_header);
+ size_t metasize = 0, imagesize = 0;
+ int c;
+ int err = 0;
+
+ if (argc < 3) {
+ fprintf(stderr, "No Seama file passed\n");
+ err = -EINVAL;
+ goto out;
+ }
+ seama_path = argv[2];
+
+ seama = fopen(seama_path, "w+");
+ if (!seama) {
+ fprintf(stderr, "Couldn't open %s\n", seama_path);
+ err = -EACCES;
+ goto out;
+ }
+ fseek(seama, curr_offset, SEEK_SET);
+
+ optind = 3;
+ while ((c = getopt(argc, argv, "m:f:b:")) != -1) {
+ switch (c) {
+ case 'm':
+ sbytes = fwrite(optarg, 1, strlen(optarg) + 1, seama);
+ if (sbytes < 0) {
+ fprintf(stderr, "Failed to write meta %s\n", optarg);
+ } else {
+ curr_offset += sbytes;
+ metasize += sbytes;
+ }
+
+ sbytes = oseama_entity_align(seama, curr_offset, 4);
+ if (sbytes < 0) {
+ fprintf(stderr, "Failed to append zeros\n");
+ } else {
+ curr_offset += sbytes;
+ metasize += sbytes;
+ }
+
+ break;
+ case 'f':
+ case 'b':
+ break;
+ }
+ }
+
+ optind = 3;
+ while ((c = getopt(argc, argv, "m:f:b:")) != -1) {
+ switch (c) {
+ case 'm':
+ break;
+ case 'f':
+ sbytes = oseama_entity_append_file(seama, optarg);
+ if (sbytes < 0) {
+ fprintf(stderr, "Failed to append file %s\n", optarg);
+ } else {
+ curr_offset += sbytes;
+ imagesize += sbytes;
+ }
+ break;
+ case 'b':
+ sbytes = strtol(optarg, NULL, 0) - curr_offset;
+ if (sbytes < 0) {
+ 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));
+ } else {
+ sbytes = oseama_entity_append_zeros(seama, sbytes);
+ if (sbytes < 0) {
+ fprintf(stderr, "Failed to append zeros\n");
+ } else {
+ curr_offset += sbytes;
+ imagesize += sbytes;
+ }
+ }
+ break;
+ }
+ if (err)
+ break;
+ }
+
+ oseama_entity_write_hdr(seama, metasize, imagesize);
+
+ 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");
+ printf("\n");
+ printf("Create Seama entity:\n");
+ printf("\toseama entity <file> [options]\n");
+ printf("\t-m meta\t\t\t\tmeta into to put in header\n");
+ 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");
+}
+
+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);
+ }
+
+ usage();
+ return 0;
+}
projects / openwrt / openwrt.git / commitdiff