From 214d9984c33a5a0eac1d890d917a054268b98879 Mon Sep 17 00:00:00 2001 From: Nikias Bassen Date: Wed, 25 Sep 2019 02:26:19 +0200 Subject: Add support for 'ftab' file format --- src/Makefile.am | 2 +- src/ftab.c | 196 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ src/ftab.h | 69 ++++++++++++++++++++ 3 files changed, 266 insertions(+), 1 deletion(-) create mode 100644 src/ftab.c create mode 100644 src/ftab.h diff --git a/src/Makefile.am b/src/Makefile.am index 1e141d1..a27f961 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -23,7 +23,7 @@ AM_LDADD = $(AC_LDADD) bin_PROGRAMS = idevicerestore -idevicerestore_SOURCES = idevicerestore.c common.c tss.c fls.c mbn.c img3.c img4.c ipsw.c normal.c dfu.c recovery.c restore.c asr.c fdr.c limera1n.c download.c locking.c socket.c thread.c jsmn.c json_plist.c +idevicerestore_SOURCES = idevicerestore.c common.c tss.c fls.c mbn.c img3.c img4.c ftab.c ipsw.c normal.c dfu.c recovery.c restore.c asr.c fdr.c limera1n.c download.c locking.c socket.c thread.c jsmn.c json_plist.c idevicerestore_CFLAGS = $(AM_CFLAGS) idevicerestore_LDFLAGS = $(AM_LDFLAGS) idevicerestore_LDADD = $(AM_LDADD) diff --git a/src/ftab.c b/src/ftab.c new file mode 100644 index 0000000..28ea40f --- /dev/null +++ b/src/ftab.c @@ -0,0 +1,196 @@ +/* + * ftab.c + * Functions for handling the ftab format + * + * Copyright (c) 2019 Nikias Bassen. All Rights Reserved. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include +#include + +#include "ftab.h" +#include "common.h" +#include "endianness.h" + +int ftab_parse(unsigned char *data, unsigned int data_size, ftab_t *ftab, uint32_t *tag) +{ + if (!data || !data_size || !ftab) { + return -1; + } + + if (data_size < sizeof(struct ftab_header)) { + error("ERROR: %s: Buffer too small for ftab data\n", __func__); + return -1; + } + + struct ftab_header *hdr_ptr = (struct ftab_header*)data; + if (be32toh(hdr_ptr->magic) != 'ftab') { + error("ERROR: %s: Unexpected magic value 0x%08x\n", le32toh(hdr_ptr->magic)); + return -1; + } + + /* copy header */ + ftab_t ftab_new = (ftab_t)calloc(1, sizeof(struct ftab_fmt)); + memcpy(&ftab_new->header, data, sizeof(struct ftab_header)); + + ftab_new->header.always_01 = le32toh(ftab_new->header.always_01); + ftab_new->header.always_ff = le32toh(ftab_new->header.always_ff); + ftab_new->header.tag = be32toh(ftab_new->header.tag); + if (tag) { + *tag = ftab_new->header.tag; + } + ftab_new->header.magic = be32toh(ftab_new->header.magic); + ftab_new->header.num_entries = le32toh(ftab_new->header.num_entries); + + /* copy entries */ + ftab_new->entries = (struct ftab_entry*)malloc(sizeof(struct ftab_entry) * ftab_new->header.num_entries); + memcpy(ftab_new->entries, data + sizeof(struct ftab_header), sizeof(struct ftab_entry) * ftab_new->header.num_entries); + + /* create data storage */ + ftab_new->storage = (unsigned char**)calloc(ftab_new->header.num_entries, sizeof(unsigned char*)); + + /* fill data storage */ + uint32_t i = 0; + for (i = 0; i < ftab_new->header.num_entries; i++) { + ftab_new->entries[i].tag = be32toh(ftab_new->entries[i].tag); + ftab_new->entries[i].offset = le32toh(ftab_new->entries[i].offset); + ftab_new->entries[i].size = le32toh(ftab_new->entries[i].size); + + ftab_new->storage[i] = malloc(ftab_new->entries[i].size); + memcpy(ftab_new->storage[i], data + ftab_new->entries[i].offset, ftab_new->entries[i].size); + } + + *ftab = ftab_new; + + return 0; +} + +int ftab_get_entry_ptr(ftab_t ftab, uint32_t tag, unsigned char **data, unsigned int *data_size) +{ + if (!ftab || !tag || !data || !data_size) { + return -1; + } + + uint32_t i; + int res = -1; + for (i = 0; i < ftab->header.num_entries; i++) { + if (ftab->entries[i].tag == tag) { + *data = ftab->storage[i]; + *data_size = ftab->entries[i].size; + res = 0; + } + } + return res; +} + +int ftab_add_entry(ftab_t ftab, uint32_t tag, unsigned char *data, unsigned int data_size) +{ + if (!ftab || !tag || !data || !data_size) { + return -1; + } + + uint32_t new_index = ftab->header.num_entries; + struct ftab_entry *new_entries = realloc(ftab->entries, sizeof(struct ftab_entry) * (ftab->header.num_entries + 1)); + if (!new_entries) { + error("ERROR: %s: realloc failed!\n", __func__); + return -1; + } + ftab->entries = new_entries; + unsigned char **new_storage = realloc(ftab->storage, sizeof(unsigned char*) * (ftab->header.num_entries + 1)); + if (!new_storage) { + error("ERROR: %s: realloc failed!\n", __func__); + return -1; + } + ftab->storage = new_storage; + + unsigned char *data_copy = (unsigned char*)malloc(data_size); + if (!data_copy) { + return -1; + } + memcpy(data_copy, data, data_size); + + ftab->storage[new_index] = data_copy; + ftab->entries[new_index].tag = tag; + ftab->entries[new_index].size = data_size; + ftab->header.num_entries++; + + uint32_t off = sizeof(struct ftab_header) + sizeof(struct ftab_entry) * ftab->header.num_entries; + uint32_t i; + for (i = 0; i < ftab->header.num_entries; i++) { + ftab->entries[i].offset = off; + off += ftab->entries[i].size; + } + + return 0; +} + +int ftab_write(ftab_t ftab, unsigned char **data, unsigned int *data_size) +{ + uint32_t i; + unsigned int total_size = sizeof(struct ftab_header); + total_size += ftab->header.num_entries * sizeof(struct ftab_entry); + for (i = 0; i < ftab->header.num_entries; i++) { + total_size += ftab->entries[i].size; + } + + unsigned char *data_out = (unsigned char*)malloc(total_size); + if (!data_out) { + error("ERROR: %s: Out of memory?!\n", __func__); + return -1; + } + + struct ftab_header *ftab_header = (struct ftab_header*)data_out; + memset(ftab_header, '\0', sizeof(struct ftab_header)); + ftab_header->always_01 = htole32(ftab->header.always_01); + ftab_header->always_ff = htole32(ftab->header.always_ff); + ftab_header->tag = htobe32(ftab->header.tag); + ftab_header->magic = htobe32(ftab->header.magic); + ftab_header->num_entries = htole32(ftab->header.num_entries); + + for (i = 0; i < ftab->header.num_entries; i++) { + struct ftab_entry* entry = (struct ftab_entry*)(data_out + sizeof(struct ftab_header) + (sizeof(struct ftab_entry) * i)); + entry->tag = htobe32(ftab->entries[i].tag); + entry->offset = htole32(ftab->entries[i].offset); + entry->size = htole32(ftab->entries[i].size); + entry->pad_0x0C = 0; + } + + unsigned char *p = data_out + sizeof(struct ftab_header) + (sizeof(struct ftab_entry) * ftab->header.num_entries); + for (i = 0; i < ftab->header.num_entries; i++) { + memcpy(p, ftab->storage[i], ftab->entries[i].size); + p += ftab->entries[i].size; + } + + *data = data_out; + *data_size = total_size; + + return 0; +} + +int ftab_free(ftab_t ftab) +{ + if (!ftab) return -1; + uint32_t i = 0; + for (i = 0; i < ftab->header.num_entries; i++) { + free(ftab->storage[i]); + } + free(ftab->storage); + free(ftab->entries); + free(ftab); + return 0; +} diff --git a/src/ftab.h b/src/ftab.h new file mode 100644 index 0000000..2efdac3 --- /dev/null +++ b/src/ftab.h @@ -0,0 +1,69 @@ +/* + * ftab.h + * Functions for handling the ftab format + * + * Copyright (c) 2019 Nikias Bassen. All Rights Reserved. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef IDEVICERESTORE_FTAB_H +#define IDEVICERESTORE_FTAB_H + +#ifdef __cplusplus +extern "C" { +#endif + +struct ftab_header { + uint32_t always_01; // 1 + uint32_t always_ff; // 0xFFFFFFFF + uint32_t unk_0x08; // 0 + uint32_t unk_0x0C; // 0 + uint32_t unk_0x10; // 0 + uint32_t unk_0x14; // 0 + uint32_t unk_0x18; // 0 + uint32_t unk_0x1C; // 0 + uint32_t tag; // e.g. 'rkos' + uint32_t magic; // 'ftab' magic + uint32_t num_entries; + uint32_t pad_0x2C; +}; + +struct ftab_entry { + uint32_t tag; + uint32_t offset; + uint32_t size; + uint32_t pad_0x0C; +}; + +struct ftab_fmt { + struct ftab_header header; + struct ftab_entry *entries; + unsigned char **storage; +}; + +typedef struct ftab_fmt *ftab_t; + +int ftab_parse(unsigned char *data, unsigned int data_size, ftab_t *ftab, uint32_t *tag); +int ftab_get_entry_ptr(ftab_t ftab, uint32_t tag, unsigned char **data, unsigned int *data_size); +int ftab_add_entry(ftab_t ftab, uint32_t tag, unsigned char *data, unsigned int data_size); +int ftab_write(ftab_t ftab, unsigned char **data, unsigned int *data_size); +int ftab_free(ftab_t ftab); + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.1-32-gdbae