+++ /dev/null
-/*
- * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
-#include <sys/types.h>
-#include <stdio.h>
-#include <getopt.h>
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "fwimage.h"
-#include "utils.h"
-#include "crc32.h"
-
-#define METADATA_MAXLEN 30 * 1024
-#define SIGNATURE_MAXLEN 1 * 1024
-
-#define BUFLEN (METADATA_MAXLEN + SIGNATURE_MAXLEN + 1024)
-
-enum {
- MODE_DEFAULT = -1,
- MODE_EXTRACT = 0,
- MODE_APPEND = 1,
-};
-
-struct data_buf {
- char *cur;
- char *prev;
- int cur_len;
- int file_len;
-};
-
-static FILE *signature_file, *metadata_file, *firmware_file;
-static int file_mode = MODE_DEFAULT;
-static bool truncate_file;
-static bool write_truncated;
-static bool quiet = false;
-
-static uint32_t crc_table[256];
-
-#define msg(...) \
- do { \
- if (!quiet) \
- fprintf(stderr, __VA_ARGS__); \
- } while (0)
-
-static int
-usage(const char *progname)
-{
- fprintf(stderr, "Usage: %s <options> <firmware>\n"
- "\n"
- "Options:\n"
- " -S <file>: Append signature file to firmware image\n"
- " -I <file>: Append metadata file to firmware image\n"
- " -s <file>: Extract signature file from firmware image\n"
- " -i <file>: Extract metadata file from firmware image\n"
- " -t: Remove extracted chunks from firmare image (using -s, -i)\n"
- " -T: Output firmware image without extracted chunks to stdout (using -s, -i)\n"
- " -q: Quiet (suppress error messages)\n"
- "\n", progname);
- return 1;
-}
-
-static FILE *
-open_file(const char *name, bool write)
-{
- FILE *ret;
-
- if (!strcmp(name, "-"))
- return write ? stdout : stdin;
-
- ret = fopen(name, write ? "w" : "r+");
- if (!ret && !write)
- ret = fopen(name, "r");
-
- return ret;
-}
-
-static int
-set_file(FILE **file, const char *name, int mode)
-{
- if (file_mode < 0)
- file_mode = mode;
- else if (file_mode != mode) {
- msg("Error: mixing appending and extracting data is not supported\n");
- return 1;
- }
-
- if (*file) {
- msg("Error: the same append/extract option cannot be used multiple times\n");
- return 1;
- }
-
- *file = open_file(name, mode == MODE_EXTRACT);
- return !*file;
-}
-
-static void
-trailer_update_crc(struct fwimage_trailer *tr, void *buf, int len)
-{
- tr->crc32 = cpu_to_be32(crc32_block(be32_to_cpu(tr->crc32), buf, len, crc_table));
-}
-
-static int
-append_data(FILE *in, FILE *out, struct fwimage_trailer *tr, int maxlen)
-{
- while (1) {
- char buf[512];
- int len;
-
- len = fread(buf, 1, sizeof(buf), in);
- if (!len)
- break;
-
- maxlen -= len;
- if (maxlen < 0)
- return 1;
-
- tr->size += len;
- trailer_update_crc(tr, buf, len);
- fwrite(buf, len, 1, out);
- }
-
- return 0;
-}
-
-static void
-append_trailer(FILE *out, struct fwimage_trailer *tr)
-{
- tr->size = cpu_to_be32(tr->size);
- fwrite(tr, sizeof(*tr), 1, out);
- trailer_update_crc(tr, tr, sizeof(*tr));
-}
-
-static int
-add_metadata(struct fwimage_trailer *tr)
-{
- struct fwimage_header hdr = {};
-
- tr->type = FWIMAGE_INFO;
- tr->size = sizeof(hdr) + sizeof(*tr);
-
- trailer_update_crc(tr, &hdr, sizeof(hdr));
- fwrite(&hdr, sizeof(hdr), 1, firmware_file);
-
- if (append_data(metadata_file, firmware_file, tr, METADATA_MAXLEN))
- return 1;
-
- append_trailer(firmware_file, tr);
-
- return 0;
-}
-
-static int
-add_signature(struct fwimage_trailer *tr)
-{
- if (!signature_file)
- return 0;
-
- tr->type = FWIMAGE_SIGNATURE;
- tr->size = sizeof(*tr);
-
- if (append_data(signature_file, firmware_file, tr, SIGNATURE_MAXLEN))
- return 1;
-
- append_trailer(firmware_file, tr);
-
- return 0;
-}
-
-static int
-add_data(const char *name)
-{
- struct fwimage_trailer tr = {
- .magic = cpu_to_be32(FWIMAGE_MAGIC),
- .crc32 = ~0,
- };
- int file_len = 0;
- int ret = 0;
-
- firmware_file = fopen(name, "r+");
- if (!firmware_file) {
- msg("Failed to open firmware file\n");
- return 1;
- }
-
- while (1) {
- char buf[512];
- int len;
-
- len = fread(buf, 1, sizeof(buf), firmware_file);
- if (!len)
- break;
-
- file_len += len;
- trailer_update_crc(&tr, buf, len);
- }
-
- if (metadata_file)
- ret = add_metadata(&tr);
- else if (signature_file)
- ret = add_signature(&tr);
-
- if (ret) {
- fflush(firmware_file);
- ftruncate(fileno(firmware_file), file_len);
- }
-
- return ret;
-}
-
-static void
-remove_tail(struct data_buf *dbuf, int len)
-{
- dbuf->cur_len -= len;
- dbuf->file_len -= len;
-
- if (dbuf->cur_len)
- return;
-
- free(dbuf->cur);
- dbuf->cur = dbuf->prev;
- dbuf->prev = NULL;
- dbuf->cur_len = BUFLEN;
-}
-
-static int
-extract_tail(struct data_buf *dbuf, void *dest, int len)
-{
- int cur_len = dbuf->cur_len;
-
- if (!dbuf->cur)
- return 1;
-
- if (cur_len >= len)
- cur_len = len;
-
- memcpy(dest + (len - cur_len), dbuf->cur + dbuf->cur_len - cur_len, cur_len);
- remove_tail(dbuf, cur_len);
-
- cur_len = len - cur_len;
- if (cur_len && !dbuf->cur)
- return 1;
-
- memcpy(dest, dbuf->cur + dbuf->cur_len - cur_len, cur_len);
- remove_tail(dbuf, cur_len);
-
- return 0;
-}
-
-static uint32_t
-tail_crc32(struct data_buf *dbuf, uint32_t crc32)
-{
- if (dbuf->prev)
- crc32 = crc32_block(crc32, dbuf->prev, BUFLEN, crc_table);
-
- return crc32_block(crc32, dbuf->cur, dbuf->cur_len, crc_table);
-}
-
-static int
-validate_metadata(struct fwimage_header *hdr, int data_len)
-{
- if (hdr->version != 0)
- return 1;
- return 0;
-}
-
-static int
-extract_data(const char *name)
-{
- struct fwimage_header *hdr;
- struct fwimage_trailer tr;
- struct data_buf dbuf = {};
- uint32_t crc32 = ~0;
- int data_len = 0;
- int ret = 1;
- void *buf;
- bool metadata_keep = false;
-
- firmware_file = open_file(name, false);
- if (!firmware_file) {
- msg("Failed to open firmware file\n");
- return 1;
- }
-
- if (truncate_file && firmware_file == stdin) {
- msg("Cannot truncate file when reading from stdin\n");
- return 1;
- }
-
- buf = malloc(BUFLEN);
- if (!buf)
- return 1;
-
- do {
- char *tmp = dbuf.cur;
-
- if (write_truncated && dbuf.prev)
- fwrite(dbuf.prev, 1, BUFLEN, stdout);
-
- dbuf.cur = dbuf.prev;
- dbuf.prev = tmp;
-
- if (dbuf.cur)
- crc32 = crc32_block(crc32, dbuf.cur, BUFLEN, crc_table);
- else
- dbuf.cur = malloc(BUFLEN);
-
- if (!dbuf.cur)
- goto out;
-
- dbuf.cur_len = fread(dbuf.cur, 1, BUFLEN, firmware_file);
- dbuf.file_len += dbuf.cur_len;
- } while (dbuf.cur_len == BUFLEN);
-
- while (1) {
-
- if (extract_tail(&dbuf, &tr, sizeof(tr)))
- break;
-
- if (tr.magic != cpu_to_be32(FWIMAGE_MAGIC)) {
- msg("Data not found\n");
- metadata_keep = true;
- break;
- }
-
- data_len = be32_to_cpu(tr.size) - sizeof(tr);
-
- if (be32_to_cpu(tr.crc32) != tail_crc32(&dbuf, crc32)) {
- msg("CRC error\n");
- break;
- }
-
- if (data_len > BUFLEN) {
- msg("Size error\n");
- break;
- }
-
- extract_tail(&dbuf, buf, data_len);
-
- if (tr.type == FWIMAGE_SIGNATURE) {
- if (!signature_file)
- continue;
- fwrite(buf, data_len, 1, signature_file);
- ret = 0;
- break;
- } else if (tr.type == FWIMAGE_INFO) {
- if (!metadata_file) {
- dbuf.file_len += data_len + sizeof(tr);
- metadata_keep = true;
- break;
- }
-
- hdr = buf;
- data_len -= sizeof(*hdr);
- if (validate_metadata(hdr, data_len))
- continue;
-
- fwrite(hdr + 1, data_len, 1, metadata_file);
- ret = 0;
- break;
- } else {
- continue;
- }
- }
-
- if (!ret && truncate_file)
- ftruncate(fileno(firmware_file), dbuf.file_len);
-
- if (write_truncated) {
- if (dbuf.prev)
- fwrite(dbuf.prev, 1, BUFLEN, stdout);
- if (dbuf.cur)
- fwrite(dbuf.cur, 1, dbuf.cur_len, stdout);
- if (metadata_keep) {
- fwrite(buf, data_len, 1, stdout);
- fwrite(&tr, sizeof(tr), 1, stdout);
- }
- }
-
-out:
- free(buf);
- free(dbuf.cur);
- free(dbuf.prev);
- return ret;
-}
-
-static void cleanup(void)
-{
- if (signature_file)
- fclose(signature_file);
- if (metadata_file)
- fclose(metadata_file);
- if (firmware_file)
- fclose(firmware_file);
-}
-
-int main(int argc, char **argv)
-{
- const char *progname = argv[0];
- int ret, ch;
-
- crc32_filltable(crc_table);
-
- while ((ch = getopt(argc, argv, "i:I:qs:S:tT")) != -1) {
- ret = 0;
- switch(ch) {
- case 'S':
- ret = set_file(&signature_file, optarg, MODE_APPEND);
- break;
- case 'I':
- ret = set_file(&metadata_file, optarg, MODE_APPEND);
- break;
- case 's':
- ret = set_file(&signature_file, optarg, MODE_EXTRACT);
- break;
- case 'i':
- ret = set_file(&metadata_file, optarg, MODE_EXTRACT);
- break;
- case 't':
- truncate_file = true;
- break;
- case 'T':
- write_truncated = true;
- break;
- case 'q':
- quiet = true;
- break;
- }
-
- if (ret)
- goto out;
- }
-
- if (optind >= argc) {
- ret = usage(progname);
- goto out;
- }
-
- if (file_mode == MODE_DEFAULT) {
- ret = usage(progname);
- goto out;
- }
-
- if (signature_file && metadata_file) {
- msg("Cannot append/extract metadata and signature in one run\n");
- return 1;
- }
-
- if (file_mode)
- ret = add_data(argv[optind]);
- else
- ret = extract_data(argv[optind]);
-
-out:
- cleanup();
- return ret;
-}
projects / openwrt / openwrt.git / blobdiff