diff options
Diffstat (limited to 'package/utils/oseama/src/oseama.c')
| -rw-r--r-- | package/utils/oseama/src/oseama.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/package/utils/oseama/src/oseama.c b/package/utils/oseama/src/oseama.c new file mode 100644 index 0000000..81a73d5 --- /dev/null +++ b/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; +} |