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rockbox/rbutil/ipodpatcher/ipodpatcher.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006-2007 Dave Chapman
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "parttypes.h"
#include "ipodio.h"
#include "ipodpatcher.h"
#ifdef WITH_BOOTOBJS
#include "ipod1g2g.h"
#include "ipod3g.h"
#include "ipod4g.h"
#include "ipodmini.h"
#include "ipodmini2g.h"
#include "ipodcolor.h"
#include "ipodnano.h"
#include "ipodvideo.h"
#endif
#ifndef RBUTIL
#include "arc4.h"
#endif
extern int verbose;
unsigned char* sectorbuf;
/* The following string appears at the start of the firmware partition */
static const char *apple_stop_sign = "{{~~ /-----\\ "\
"{{~~ / \\ "\
"{{~~| | "\
"{{~~| S T O P | "\
"{{~~| | "\
"{{~~ \\ / "\
"{{~~ \\-----/ "\
"Copyright(C) 200"\
"1 Apple Computer"\
", Inc.----------"\
"----------------"\
"----------------"\
"----------------"\
"----------------"\
"----------------"\
"---------------";
/* Windows requires the buffer for disk I/O to be aligned in memory on a
multiple of the disk volume size - so we use a single global variable
and initialise it with ipod_alloc_buf()
*/
char* get_parttype(int pt)
{
int i;
static char unknown[]="Unknown";
if (pt == PARTTYPE_HFS) {
return "HFS/HFS+";
}
i=0;
while (parttypes[i].name != NULL) {
if (parttypes[i].type == pt) {
return (parttypes[i].name);
}
i++;
}
return unknown;
}
off_t filesize(int fd) {
struct stat buf;
if (fstat(fd,&buf) < 0) {
perror("[ERR] Checking filesize of input file");
return -1;
} else {
return(buf.st_size);
}
}
/* Partition table parsing code taken from Rockbox */
#define MAX_SECTOR_SIZE 2048
#define SECTOR_SIZE 512
static inline unsigned short le2ushort(unsigned char* buf)
{
unsigned short res = (buf[1] << 8) | buf[0];
return res;
}
static inline int le2int(unsigned char* buf)
{
int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
return res;
}
static inline int be2int(unsigned char* buf)
{
int32_t res = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
return res;
}
static inline int getint16le(char* buf)
{
int16_t res = (buf[1] << 8) | buf[0];
return res;
}
static inline void short2le(unsigned short val, unsigned char* addr)
{
addr[0] = val & 0xFF;
addr[1] = (val >> 8) & 0xff;
}
static inline void int2le(unsigned int val, unsigned char* addr)
{
addr[0] = val & 0xFF;
addr[1] = (val >> 8) & 0xff;
addr[2] = (val >> 16) & 0xff;
addr[3] = (val >> 24) & 0xff;
}
static inline void int2be(unsigned int val, unsigned char* addr)
{
addr[0] = (val >> 24) & 0xff;
addr[1] = (val >> 16) & 0xff;
addr[2] = (val >> 8) & 0xff;
addr[3] = val & 0xFF;
}
#define BYTES2INT32(array,pos)\
((long)array[pos] | ((long)array[pos+1] << 8 ) |\
((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))
int read_partinfo(struct ipod_t* ipod, int silent)
{
int i;
unsigned long count;
count = ipod_read(ipod,sectorbuf, ipod->sector_size);
if (count <= 0) {
print_error(" Error reading from disk: ");
return -1;
}
memset(ipod->pinfo, 0, sizeof(ipod->pinfo));
if ((sectorbuf[510] == 0x55) && (sectorbuf[511] == 0xaa)) {
/* DOS partition table */
ipod->macpod = 0;
/* parse partitions */
for ( i = 0; i < 4; i++ ) {
unsigned char* ptr = sectorbuf + 0x1be + 16*i;
ipod->pinfo[i].type = ptr[4];
ipod->pinfo[i].start = BYTES2INT32(ptr, 8);
ipod->pinfo[i].size = BYTES2INT32(ptr, 12);
/* extended? */
if ( ipod->pinfo[i].type == 5 ) {
/* not handled yet */
}
}
} else if ((sectorbuf[0] == 'E') && (sectorbuf[1] == 'R')) {
/* Apple Partition Map */
/* APM parsing code based on the check_mac_partitions() function in
ipodloader2 - written by Thomas Tempelmann and released
under the GPL. */
int blkNo = 1;
int partBlkCount = 1;
int partBlkSizMul = sectorbuf[2] / 2;
int pmMapBlkCnt; /* # of blks in partition map */
int pmPyPartStart; /* physical start blk of partition */
int pmPartBlkCnt; /* # of blks in this partition */
int i = 0;
ipod->macpod = 1;
memset(ipod->pinfo,0,sizeof(ipod->pinfo));
while (blkNo <= partBlkCount) {
if (ipod_seek(ipod, blkNo * partBlkSizMul * 512) < 0) {
fprintf(stderr,"[ERR] Seek failed whilst reading APM\n");
return -1;
}
count = ipod_read(ipod, sectorbuf, ipod->sector_size);
if (count <= 0) {
print_error(" Error reading from disk: ");
return -1;
}
/* see if it's a partition entry */
if ((sectorbuf[0] != 'P') || (sectorbuf[1] != 'M')) {
/* end of partition table -> leave the loop */
break;
}
/* Extract the interesting entries */
pmMapBlkCnt = be2int(sectorbuf + 4);
pmPyPartStart = be2int(sectorbuf + 8);
pmPartBlkCnt = be2int(sectorbuf + 12);
/* update the number of part map blocks */
partBlkCount = pmMapBlkCnt;
if (strncmp((char*)(sectorbuf + 48), "Apple_MDFW", 32)==0) {
/* A Firmware partition */
ipod->pinfo[i].start = pmPyPartStart;
ipod->pinfo[i].size = pmPartBlkCnt;
ipod->pinfo[i].type = 0;
i++;
} else if (strncmp((char*)(sectorbuf + 48), "Apple_HFS", 32)==0) {
/* A HFS partition */
ipod->pinfo[i].start = pmPyPartStart;
ipod->pinfo[i].size = pmPartBlkCnt;
ipod->pinfo[i].type = PARTTYPE_HFS;
i++;
}
blkNo++; /* read next partition map entry */
}
} else {
if (!silent) fprintf(stderr,"[ERR] Bad boot sector signature\n");
return -1;
}
/* Check that the partition table looks like an ipod:
1) Partition 1 is of type 0 (Empty) but isn't empty.
2) Partition 2 is of type 0xb or 0xc (winpod) or -1 (macpod)
*/
if ((ipod->pinfo[0].type != 0) || (ipod->pinfo[0].size == 0) ||
((ipod->pinfo[1].type != 0xb) && (ipod->pinfo[1].type != 0xc) &&
(ipod->pinfo[1].type != PARTTYPE_HFS))) {
if (!silent) fprintf(stderr,"[ERR] Partition layout is not an ipod\n");
return -1;
}
ipod->start = ipod->pinfo[0].start*ipod->sector_size;
return 0;
}
int read_partition(struct ipod_t* ipod, int outfile)
{
int res;
ssize_t n;
int bytesleft;
int chunksize;
int count = ipod->pinfo[0].size;
if (ipod_seek(ipod, ipod->start) < 0) {
return -1;
}
fprintf(stderr,"[INFO] Writing %d sectors to output file\n",count);
bytesleft = count * ipod->sector_size;
while (bytesleft > 0) {
if (bytesleft > BUFFER_SIZE) {
chunksize = BUFFER_SIZE;
} else {
chunksize = bytesleft;
}
n = ipod_read(ipod, sectorbuf, chunksize);
if (n < 0) {
return -1;
}
if (n < chunksize) {
fprintf(stderr,
"[ERR] Short read in disk_read() - requested %d, got %d\n",
chunksize,(int)n);
return -1;
}
bytesleft -= n;
res = write(outfile,sectorbuf,n);
if (res < 0) {
perror("[ERR] write in disk_read");
return -1;
}
if (res != n) {
fprintf(stderr,
"Short write - requested %d, received %d - aborting.\n",(int)n,res);
return -1;
}
}
fprintf(stderr,"[INFO] Done.\n");
return 0;
}
int write_partition(struct ipod_t* ipod, int infile)
{
ssize_t res;
int n;
int bytesread;
int byteswritten = 0;
int eof;
int padding = 0;
if (ipod_seek(ipod, ipod->start) < 0) {
return -1;
}
fprintf(stderr,"[INFO] Writing input file to device\n");
bytesread = 0;
eof = 0;
while (!eof) {
n = read(infile,sectorbuf,BUFFER_SIZE);
if (n < 0) {
perror("[ERR] read in disk_write");
return -1;
}
if (n < BUFFER_SIZE) {
eof = 1;
/* We need to pad the last write to a multiple of SECTOR_SIZE */
if ((n % ipod->sector_size) != 0) {
padding = (ipod->sector_size-(n % ipod->sector_size));
n += padding;
}
}
bytesread += n;
res = ipod_write(ipod, sectorbuf, n);
if (res < 0) {
print_error(" Error writing to disk: ");
fprintf(stderr,"Bytes written: %d\n",byteswritten);
return -1;
}
if (res != n) {
fprintf(stderr,"[ERR] Short write - requested %d, received %d - aborting.\n",n,(int)res);
return -1;
}
byteswritten += res;
}
fprintf(stderr,"[INFO] Wrote %d bytes plus %d bytes padding.\n",
byteswritten-padding,padding);
return 0;
}
char* ftypename[] = { "OSOS", "RSRC", "AUPD", "HIBE" };
int diskmove(struct ipod_t* ipod, int delta)
{
int src_start;
int src_end;
int bytesleft;
int chunksize;
int n;
src_start = ipod->ipod_directory[1].devOffset;
src_end = (ipod->ipod_directory[ipod->nimages-1].devOffset + ipod->sector_size +
ipod->ipod_directory[ipod->nimages-1].len +
(ipod->sector_size-1)) & ~(ipod->sector_size-1);
bytesleft = src_end - src_start;
if (verbose) {
fprintf(stderr,"[INFO] Need to move images 2-%d forward %08x bytes\n", ipod->nimages,delta);
fprintf(stderr,"[VERB] src_start = %08x\n",src_start);
fprintf(stderr,"[VERB] src_end = %08x\n",src_end);
fprintf(stderr,"[VERB] dest_start = %08x\n",src_start+delta);
fprintf(stderr,"[VERB] dest_end = %08x\n",src_end+delta);
fprintf(stderr,"[VERB] bytes to copy = %08x\n",bytesleft);
}
while (bytesleft > 0) {
if (bytesleft <= BUFFER_SIZE) {
chunksize = bytesleft;
} else {
chunksize = BUFFER_SIZE;
}
if (verbose) {
fprintf(stderr,"[VERB] Copying %08x bytes from %08x to %08x (absolute %08x to %08x)\n",
chunksize,
src_end-chunksize,
src_end-chunksize+delta,
(unsigned int)(ipod->start+src_end-chunksize),
(unsigned int)(ipod->start+src_end-chunksize+delta));
}
if (ipod_seek(ipod, ipod->start+src_end-chunksize) < 0) {
fprintf(stderr,"[ERR] Seek failed\n");
return -1;
}
if ((n = ipod_read(ipod,sectorbuf,chunksize)) < 0) {
perror("[ERR] Write failed\n");
return -1;
}
if (n < chunksize) {
fprintf(stderr,"[ERR] Short read - requested %d bytes, received %d\n",
chunksize,n);
return -1;
}
if (ipod_seek(ipod, ipod->start+src_end-chunksize+delta) < 0) {
fprintf(stderr,"[ERR] Seek failed\n");
return -1;
}
if ((n = ipod_write(ipod,sectorbuf,chunksize)) < 0) {
perror("[ERR] Write failed\n");
return -1;
}
if (n < chunksize) {
fprintf(stderr,"[ERR] Short write - requested %d bytes, received %d\n"
,chunksize,n);
return -1;
}
src_end -= chunksize;
bytesleft -= chunksize;
}
return 0;
}
int add_bootloader(struct ipod_t* ipod, char* filename, int type)
{
int length;
int i;
int x;
int n;
int infile;
int paddedlength;
int entryOffset;
int delta = 0;
unsigned long chksum=0;
unsigned long filechksum=0;
unsigned char header[8]; /* Header for .ipod file */
unsigned char* bootloader_buf;
/* Calculate the position in the OSOS image where our bootloader will go. */
if (ipod->ipod_directory[0].entryOffset>0) {
/* Keep the same entryOffset */
entryOffset = ipod->ipod_directory[0].entryOffset;
} else {
entryOffset = (ipod->ipod_directory[0].len+ipod->sector_size-1)&~(ipod->sector_size-1);
}
#ifdef WITH_BOOTOBJS
if (type == FILETYPE_INTERNAL) {
fprintf(stderr,"[INFO] Using internal bootloader - %d bytes\n",ipod->bootloader_len);
memcpy(sectorbuf+entryOffset,ipod->bootloader,ipod->bootloader_len);
length = ipod->bootloader_len;
paddedlength=(ipod->bootloader_len+ipod->sector_size-1)&~(ipod->sector_size-1);
}
else
#endif
{
infile=open(filename,O_RDONLY);
if (infile < 0) {
fprintf(stderr,"[ERR] Couldn't open input file %s\n",filename);
return -1;
}
if (type==FILETYPE_DOT_IPOD) {
/* First check that the input file is the correct type for this ipod. */
n = read(infile,header,8);
if (n < 8) {
fprintf(stderr,"[ERR] Failed to read header from %s\n",filename);
close(infile);
return -1;
}
if (memcmp(header+4, ipod->modelname,4)!=0) {
fprintf(stderr,"[ERR] Model name in input file (%c%c%c%c) doesn't match ipod model (%s)\n",
header[4],header[5],header[6],header[7], ipod->modelname);
close(infile);
return -1;
}
filechksum = be2int(header);
length=filesize(infile)-8;
} else {
length=filesize(infile);
}
paddedlength=(length+ipod->sector_size-1)&~(ipod->sector_size-1);
bootloader_buf = malloc(length);
if (bootloader_buf == NULL) {
fprintf(stderr,"[ERR] Can not allocate memory for bootloader\n");
return -1;
}
/* Now read our bootloader - we need to check it before modifying the partition*/
n = read(infile,bootloader_buf,length);
close(infile);
if (n < 0) {
fprintf(stderr,"[ERR] Couldn't read input file\n");
return -1;
}
if (type==FILETYPE_DOT_IPOD) {
/* Calculate and confirm bootloader checksum */
chksum = ipod->modelnum;
for (i = 0; i < length; i++) {
/* add 8 unsigned bits but keep a 32 bit sum */
chksum += bootloader_buf[i];
}
if (chksum == filechksum) {
fprintf(stderr,"[INFO] Checksum OK in %s\n",filename);
} else {
fprintf(stderr,"[ERR] Checksum in %s failed check\n",filename);
return -1;
}
}
}
if (entryOffset+paddedlength > BUFFER_SIZE) {
fprintf(stderr,"[ERR] Input file too big for buffer\n");
return -1;
}
if (verbose) {
fprintf(stderr,"[VERB] Original firmware begins at 0x%08x\n", ipod->ipod_directory[0].devOffset + ipod->sector_size);
fprintf(stderr,"[VERB] New entryOffset will be 0x%08x\n",entryOffset);
fprintf(stderr,"[VERB] End of bootloader will be at 0x%08x\n",entryOffset+paddedlength);
}
/* Check if we have enough space */
/* TODO: Check the size of the partition. */
if (ipod->nimages > 1) {
if ((ipod->ipod_directory[0].devOffset+entryOffset+paddedlength) >
ipod->ipod_directory[1].devOffset) {
fprintf(stderr,"[INFO] Moving images to create room for new firmware...\n");
delta = ipod->ipod_directory[0].devOffset + entryOffset+paddedlength
- ipod->ipod_directory[1].devOffset + ipod->sector_size;
if (diskmove(ipod, delta) < 0) {
fprintf(stderr,"[ERR] Image movement failed.\n");
return -1;
}
}
}
/* We have moved the partitions, now we can write our bootloader */
/* Firstly read the original firmware into sectorbuf */
fprintf(stderr,"[INFO] Reading original firmware...\n");
if (ipod_seek(ipod, ipod->fwoffset+ipod->ipod_directory[0].devOffset) < 0) {
fprintf(stderr,"[ERR] Seek failed\n");
return -1;
}
if ((n = ipod_read(ipod,sectorbuf,entryOffset)) < 0) {
perror("[ERR] Read failed\n");
return -1;
}
if (n < entryOffset) {
fprintf(stderr,"[ERR] Short read - requested %d bytes, received %d\n"
,entryOffset,n);
return -1;
}
#ifdef WITH_BOOTOBJS
if (type == FILETYPE_INTERNAL) {
memcpy(sectorbuf+entryOffset,ipod->bootloader,ipod->bootloader_len);
}
else
#endif
{
memcpy(sectorbuf+entryOffset,bootloader_buf,length);
free(bootloader_buf);
}
/* Calculate new checksum for combined image */
chksum = 0;
for (i=0;i<entryOffset + length; i++) {
chksum += sectorbuf[i];
}
/* Now write the combined firmware image to the disk */
if (ipod_seek(ipod, ipod->fwoffset+ipod->ipod_directory[0].devOffset) < 0) {
fprintf(stderr,"[ERR] Seek failed\n");
return -1;
}
if ((n = ipod_write(ipod,sectorbuf,entryOffset+paddedlength)) < 0) {
perror("[ERR] Write failed\n");
return -1;
}
if (n < (entryOffset+paddedlength)) {
fprintf(stderr,"[ERR] Short read - requested %d bytes, received %d\n"
,entryOffset+paddedlength,n);
return -1;
}
fprintf(stderr,"[INFO] Wrote %d bytes to firmware partition\n",entryOffset+paddedlength);
x = ipod->diroffset % ipod->sector_size;
/* Read directory */
if (ipod_seek(ipod, ipod->start + ipod->diroffset - x) < 0) {
fprintf(stderr,"[ERR] Seek failed\n");
return -1;
}
n=ipod_read(ipod, sectorbuf, ipod->sector_size);
if (n < 0) {
fprintf(stderr,"[ERR] Directory read failed\n");
return -1;
}
/* Update entries for image 0 */
int2le(entryOffset+length,sectorbuf+x+16);
int2le(entryOffset,sectorbuf+x+24);
int2le(chksum,sectorbuf+x+28);
int2le(0xffffffff,sectorbuf+x+36); /* loadAddr */
/* Update devOffset entries for other images, if we have moved them */
if (delta > 0) {
for (i=1;i<ipod->nimages;i++) {
int2le(le2int(sectorbuf+x+i*40+12)+delta,sectorbuf+x+i*40+12);
}
}
/* Write directory */
if (ipod_seek(ipod, ipod->start + ipod->diroffset - x) < 0) {
fprintf(stderr,"[ERR] Seek to %d failed\n", (int)(ipod->start+ipod->diroffset-x));
return -1;
}
n=ipod_write(ipod, sectorbuf, ipod->sector_size);
if (n < 0) {
fprintf(stderr,"[ERR] Directory write failed\n");
return -1;
}
return 0;
}
int delete_bootloader(struct ipod_t* ipod)
{
int length;
int i;
int x;
int n;
unsigned long chksum=0; /* 32 bit checksum - Rockbox .ipod style*/
/* Removing the bootloader involves adjusting the "length",
"chksum" and "entryOffset" values in the osos image's directory
entry. */
/* Firstly check we have a bootloader... */
if (ipod->ipod_directory[0].entryOffset == 0) {
fprintf(stderr,"[ERR] No bootloader found.\n");
return -1;
}
length = ipod->ipod_directory[0].entryOffset;
/* Read the firmware so we can calculate the checksum */
fprintf(stderr,"[INFO] Reading firmware (%d bytes)\n",length);
if (ipod_seek(ipod, ipod->fwoffset+ipod->ipod_directory[0].devOffset) < 0) {
return -1;
}
i = (length+ipod->sector_size-1) & ~(ipod->sector_size-1);
fprintf(stderr,"[INFO] Padding read from 0x%08x to 0x%08x bytes\n",
length,i);
if ((n = ipod_read(ipod,sectorbuf,i)) < 0) {
return -1;
}
if (n < i) {
fprintf(stderr,"[ERR] Short read - requested %d bytes, received %d\n",
i,n);
return -1;
}
chksum = 0;
for (i = 0; i < length; i++) {
/* add 8 unsigned bits but keep a 32 bit sum */
chksum += sectorbuf[i];
}
/* Now write back the updated directory entry */
fprintf(stderr,"[INFO] Updating firmware checksum\n");
x = ipod->diroffset % ipod->sector_size;
/* Read directory */
if (ipod_seek(ipod, ipod->start + ipod->diroffset - x) < 0) { return -1; }
n=ipod_read(ipod, sectorbuf, ipod->sector_size);
if (n < 0) { return -1; }
/* Update entries for image 0 */
int2le(length,sectorbuf+x+16);
int2le(0,sectorbuf+x+24);
int2le(chksum,sectorbuf+x+28);
/* Write directory */
if (ipod_seek(ipod, ipod->start + ipod->diroffset - x) < 0) { return -1; }
n=ipod_write(ipod, sectorbuf, ipod->sector_size);
if (n < 0) { return -1; }
return 0;
}
int write_firmware(struct ipod_t* ipod, char* filename, int type)
{
int length;
int i;
int x;
int n;
int infile;
int newsize;
int bytesavailable;
unsigned long chksum=0;
unsigned long filechksum=0;
unsigned char header[8]; /* Header for .ipod file */
#ifdef WITH_BOOTOBJS
if (type == FILETYPE_INTERNAL) {
fprintf(stderr,"[INFO] Using internal bootloader - %d bytes\n",ipod->bootloader_len);
length = ipod->bootloader_len;
infile = -1;
}
else
#endif
{
/* First check that the input file is the correct type for this ipod. */
infile=open(filename,O_RDONLY);
if (infile < 0) {
fprintf(stderr,"[ERR] Couldn't open input file %s\n",filename);
return -1;
}
if (type==FILETYPE_DOT_IPOD) {
n = read(infile,header,8);
if (n < 8) {
fprintf(stderr,"[ERR] Failed to read header from %s\n",filename);
close(infile);
return -1;
}
if (memcmp(header+4, ipod->modelname,4)!=0) {
fprintf(stderr,"[ERR] Model name in input file (%c%c%c%c) doesn't match ipod model (%s)\n",
header[4],header[5],header[6],header[7], ipod->modelname);
close(infile);
return -1;
}
filechksum = be2int(header);
length = filesize(infile)-8;
} else {
length = filesize(infile);
}
}
newsize=(length+ipod->sector_size-1)&~(ipod->sector_size-1);
fprintf(stderr,"[INFO] Padding input file from 0x%08x to 0x%08x bytes\n",
length,newsize);
if (newsize > BUFFER_SIZE) {
fprintf(stderr,"[ERR] Input file too big for buffer\n");
if (infile >= 0) close(infile);
return -1;
}
/* Check if we have enough space */
/* TODO: Check the size of the partition. */
if (ipod->nimages > 1) {
bytesavailable=ipod->ipod_directory[1].devOffset-ipod->ipod_directory[0].devOffset;
if (bytesavailable < newsize) {
fprintf(stderr,"[INFO] Moving images to create room for new firmware...\n");
/* TODO: Implement image movement */
fprintf(stderr,"[ERR] Image movement not yet implemented.\n");
close(infile);
return -1;
}
}
#ifdef WITH_BOOTOBJS
if (type == FILETYPE_INTERNAL) {
memcpy(sectorbuf,ipod->bootloader,ipod->bootloader_len);
}
else
#endif
{
fprintf(stderr,"[INFO] Reading input file...\n");
/* We now know we have enough space, so write it. */
n = read(infile,sectorbuf,length);
if (n < 0) {
fprintf(stderr,"[ERR] Couldn't read input file\n");
close(infile);
return -1;
}
close(infile);
}
/* Pad the data with zeros */
memset(sectorbuf+length,0,newsize-length);
if (type==FILETYPE_DOT_IPOD) {
chksum = ipod->modelnum;
for (i = 0; i < length; i++) {
/* add 8 unsigned bits but keep a 32 bit sum */
chksum += sectorbuf[i];
}
if (chksum == filechksum) {
fprintf(stderr,"[INFO] Checksum OK in %s\n",filename);
} else {
fprintf(stderr,"[ERR] Checksum in %s failed check\n",filename);
return -1;
}
}
if (ipod_seek(ipod, ipod->fwoffset+ipod->ipod_directory[0].devOffset) < 0) {
fprintf(stderr,"[ERR] Seek failed\n");
return -1;
}
if ((n = ipod_write(ipod,sectorbuf,newsize)) < 0) {
perror("[ERR] Write failed\n");
return -1;
}
if (n < newsize) {
fprintf(stderr,"[ERR] Short write - requested %d bytes, received %d\n"
,newsize,n);
return -1;
}
fprintf(stderr,"[INFO] Wrote %d bytes to firmware partition\n",n);
/* Now we need to update the "len", "entryOffset" and "chksum" fields */
chksum = 0;
for (i = 0; i < length; i++) {
/* add 8 unsigned bits but keep a 32 bit sum */
chksum += sectorbuf[i];
}
x = ipod->diroffset % ipod->sector_size;
/* Read directory */
if (ipod_seek(ipod, ipod->start + ipod->diroffset - x) < 0) { return -1; }
n=ipod_read(ipod, sectorbuf, ipod->sector_size);
if (n < 0) { return -1; }
/* Update entries for image 0 */
int2le(length,sectorbuf+x+16);
int2le(0,sectorbuf+x+24);
int2le(chksum,sectorbuf+x+28);
/* Write directory */
if (ipod_seek(ipod, ipod->start + ipod->diroffset - x) < 0) { return -1; }
n=ipod_write(ipod, sectorbuf, ipod->sector_size);
if (n < 0) { return -1; }
return 0;
}
int read_firmware(struct ipod_t* ipod, char* filename, int type)
{
int length;
int i;
int outfile;
int n;
unsigned long chksum=0; /* 32 bit checksum - Rockbox .ipod style*/
unsigned char header[8]; /* Header for .ipod file */
if (ipod->ipod_directory[0].entryOffset != 0) {
/* We have a bootloader... */
length = ipod->ipod_directory[0].entryOffset;
} else {
length = ipod->ipod_directory[0].len;
}
fprintf(stderr,"[INFO] Reading firmware (%d bytes)\n",length);
if (ipod_seek(ipod, ipod->fwoffset+ipod->ipod_directory[0].devOffset) < 0) {
return -1;
}
i = (length+ipod->sector_size-1) & ~(ipod->sector_size-1);
fprintf(stderr,"[INFO] Padding read from 0x%08x to 0x%08x bytes\n",
length,i);
if ((n = ipod_read(ipod,sectorbuf,i)) < 0) {
return -1;
}
if (n < i) {
fprintf(stderr,"[ERR] Short read - requested %d bytes, received %d\n",
i,n);
return -1;
}
outfile = open(filename,O_CREAT|O_TRUNC|O_WRONLY|O_BINARY,0666);
if (outfile < 0) {
fprintf(stderr,"[ERR] Couldn't open file %s\n",filename);
return -1;
}
if (type == FILETYPE_DOT_IPOD) {
chksum = ipod->modelnum;
for (i = 0; i < length; i++) {
/* add 8 unsigned bits but keep a 32 bit sum */
chksum += sectorbuf[i];
}
int2be(chksum,header);
memcpy(header+4, ipod->modelname,4);
n = write(outfile,header,8);
if (n != 8) {
fprintf(stderr,"[ERR] Write error - %d\n",n);
}
}
n = write(outfile,sectorbuf,length);
if (n != length) {
fprintf(stderr,"[ERR] Write error - %d\n",n);
}
close(outfile);
return 0;
}
int read_directory(struct ipod_t* ipod)
{
int n;
int x;
unsigned char* p;
unsigned short version;
ipod->nimages=0;
/* Read firmware partition header (first 512 bytes of disk - but
let's read a whole sector) */
if (ipod_seek(ipod, ipod->start) < 0) {
fprintf(stderr,"[ERR] Seek to 0x%08x in read_directory() failed.\n",
(unsigned int)(ipod->start));
return -1;
}
n=ipod_read(ipod, sectorbuf, ipod->sector_size);
if (n < 0) {
fprintf(stderr,"[ERR] ipod_read(ipod,buf,0x%08x) failed in read_directory()\n", ipod->sector_size);
return -1;
}
if (memcmp(sectorbuf,apple_stop_sign,sizeof(apple_stop_sign))!=0) {
fprintf(stderr,"[ERR] Firmware partition doesn't contain Apple copyright, aborting.\n");
return -1;
}
if (memcmp(sectorbuf+0x100,"]ih[",4)!=0) {
fprintf(stderr,"[ERR] Bad firmware directory\n");
return -1;
}
version = le2ushort(sectorbuf+0x10a);
if ((version != 2) && (version != 3)) {
fprintf(stderr,"[ERR] Unknown firmware format version %04x\n",
version);
}
ipod->diroffset=le2int(sectorbuf+0x104) + 0x200;
/* diroffset may not be sector-aligned */
x = ipod->diroffset % ipod->sector_size;
/* Read directory */
if (ipod_seek(ipod, ipod->start + ipod->diroffset - x) < 0) {
fprintf(stderr,"[ERR] Seek to diroffset (%08x) failed.\n",(unsigned)ipod->diroffset);
return -1;
}
n=ipod_read(ipod, sectorbuf, ipod->sector_size);
if (n < 0) {
fprintf(stderr,"[ERR] Read of directory failed.\n");
return -1;
}
p = sectorbuf + x;
/* A hack to detect 2nd gen Nanos - maybe there is a better way? */
if (p[0] == 0)
{
n=ipod_read(ipod, sectorbuf, ipod->sector_size);
if (n < 0) {
fprintf(stderr,"[ERR] Read of directory failed.\n");
return -1;
}
p = sectorbuf;
}
while ((ipod->nimages < MAX_IMAGES) && (p < (sectorbuf + x + 400)) &&
((memcmp(p,"!ATA",4)==0) || (memcmp(p,"DNAN",4)==0))) {
p+=4;
if (memcmp(p,"soso",4)==0) {
ipod->ipod_directory[ipod->nimages].ftype=FTYPE_OSOS;
} else if (memcmp(p,"crsr",4)==0) {
ipod->ipod_directory[ipod->nimages].ftype=FTYPE_RSRC;
} else if (memcmp(p,"dpua",4)==0) {
ipod->ipod_directory[ipod->nimages].ftype=FTYPE_AUPD;
} else if (memcmp(p,"ebih",4)==0) {
ipod->ipod_directory[ipod->nimages].ftype=FTYPE_HIBE;
} else {
fprintf(stderr,"[ERR] Unknown image type %c%c%c%c\n",
p[0],p[1],p[2],p[3]);
}
p+=4;
ipod->ipod_directory[ipod->nimages].id=le2int(p);
p+=4;
ipod->ipod_directory[ipod->nimages].devOffset=le2int(p);
p+=4;
ipod->ipod_directory[ipod->nimages].len=le2int(p);
p+=4;
ipod->ipod_directory[ipod->nimages].addr=le2int(p);
p+=4;
ipod->ipod_directory[ipod->nimages].entryOffset=le2int(p);
p+=4;
ipod->ipod_directory[ipod->nimages].chksum=le2int(p);
p+=4;
ipod->ipod_directory[ipod->nimages].vers=le2int(p);
p+=4;
ipod->ipod_directory[ipod->nimages].loadAddr=le2int(p);
p+=4;
ipod->nimages++;
}
if ((ipod->nimages > 1) && (version==2)) {
/* The 3g firmware image doesn't appear to have a version, so
let's make one up... Note that this is never written back to the
ipod, so it's OK to do. */
if (ipod->ipod_directory[0].vers == 0) { ipod->ipod_directory[0].vers = 3; }
ipod->fwoffset = ipod->start;
} else {
ipod->fwoffset = ipod->start + ipod->sector_size;
}
return 0;
}
int list_images(struct ipod_t* ipod)
{
int i;
if (verbose) {
printf(" Type id devOffset len addr entryOffset chksum vers loadAddr devOffset+len\n");
for (i = 0 ; i < ipod->nimages; i++) {
printf("%d - %s 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n",i,
ftypename[ipod->ipod_directory[i].ftype],
ipod->ipod_directory[i].id,
ipod->ipod_directory[i].devOffset,
ipod->ipod_directory[i].len,
ipod->ipod_directory[i].addr,
ipod->ipod_directory[i].entryOffset,
ipod->ipod_directory[i].chksum,
ipod->ipod_directory[i].vers,
ipod->ipod_directory[i].loadAddr,
ipod->ipod_directory[i].devOffset+((ipod->ipod_directory[i].len+ipod->sector_size-1)&~(ipod->sector_size-1)));
}
}
printf("\n");
printf("Listing firmware partition contents:\n");
printf("\n");
for (i = 0 ; i < ipod->nimages; i++) {
printf("Image %d:\n",i+1);
switch(ipod->ipod_directory[i].ftype) {
case FTYPE_OSOS:
if (ipod->ipod_directory[i].entryOffset==0) {
printf(" Main firmware - %d bytes\n",
ipod->ipod_directory[i].len);
} else {
printf(" Main firmware - %d bytes\n",
ipod->ipod_directory[i].entryOffset);
printf(" Third-party bootloader - %d bytes\n",
ipod->ipod_directory[i].len-ipod->ipod_directory[i].entryOffset);
}
break;
default:
printf(" %s - %d bytes\n",
ftypename[ipod->ipod_directory[i].ftype],
ipod->ipod_directory[i].len);
}
}
printf("\n");
return 0;
}
int getmodel(struct ipod_t* ipod, int ipod_version)
{
switch (ipod_version) {
case 0x01:
ipod->modelstr="1st or 2nd Generation";
ipod->modelnum = 19;
ipod->modelname = "1g2g";
ipod->targetname = "ipod1g2g";
#ifdef WITH_BOOTOBJS
ipod->bootloader = ipod1g2g;
ipod->bootloader_len = LEN_ipod1g2g;
#endif
break;
case 0x02:
ipod->modelstr="3rd Generation";
ipod->modelnum = 7;
ipod->modelname = "ip3g";
ipod->targetname = "ipod3g";
#ifdef WITH_BOOTOBJS
ipod->bootloader = ipod3g;
ipod->bootloader_len = LEN_ipod3g;
#endif
break;
case 0x40:
ipod->modelstr="1st Generation Mini";
ipod->modelnum = 9;
ipod->modelname = "mini";
ipod->targetname = "ipodmini1g";
#ifdef WITH_BOOTOBJS
ipod->bootloader = ipodmini;
ipod->bootloader_len = LEN_ipodmini;
#endif
break;
case 0x50:
ipod->modelstr="4th Generation";
ipod->modelnum = 8;
ipod->modelname = "ip4g";
ipod->targetname = "ipod4gray";
#ifdef WITH_BOOTOBJS
ipod->bootloader = ipod4g;
ipod->bootloader_len = LEN_ipod4g;
#endif
break;
case 0x60:
ipod->modelstr="Photo/Color";
ipod->modelnum = 3;
ipod->modelname = "ipco";
ipod->targetname = "ipodcolor";
#ifdef WITH_BOOTOBJS
ipod->bootloader = ipodcolor;
ipod->bootloader_len = LEN_ipodcolor;
#endif
break;
case 0x70:
ipod->modelstr="2nd Generation Mini";
ipod->modelnum = 11;
ipod->modelname = "mn2g";
ipod->targetname = "ipodmini2g";
#ifdef WITH_BOOTOBJS
ipod->bootloader = ipodmini2g;
ipod->bootloader_len = LEN_ipodmini2g;
#endif
break;
case 0xc0:
ipod->modelstr="1st Generation Nano";
ipod->modelnum = 4;
ipod->modelname = "nano";
ipod->targetname = "ipodnano";
#ifdef WITH_BOOTOBJS
ipod->bootloader = ipodnano;
ipod->bootloader_len = LEN_ipodnano;
#endif
break;
case 0xb0:
ipod->modelstr="Video (aka 5th Generation)";
ipod->modelnum = 5;
ipod->modelname = "ipvd";
ipod->targetname = "ipodvideo";
#ifdef WITH_BOOTOBJS
ipod->bootloader = ipodvideo;
ipod->bootloader_len = LEN_ipodvideo;
#endif
break;
case 0x100:
ipod->modelstr="2nd Generation Nano";
ipod->modelnum = 0;
ipod->targetname = NULL;
#ifdef WITH_BOOTOBJS
ipod->bootloader = NULL;
ipod->bootloader_len = 0;
#endif
break;
default:
ipod->modelname = NULL;
ipod->modelnum = 0;
ipod->targetname = NULL;
#ifdef WITH_BOOTOBJS
ipod->bootloader = NULL;
ipod->bootloader_len = 0;
#endif
return -1;
}
return 0;
}
int ipod_scan(struct ipod_t* ipod)
{
int i;
int n = 0;
int ipod_version;
char last_ipod[4096];
printf("[INFO] Scanning disk devices...\n");
for (i = 0; i <= 25 ; i++) {
#ifdef __WIN32__
sprintf(ipod->diskname,"\\\\.\\PhysicalDrive%d",i);
#elif defined(linux) || defined (__linux)
sprintf(ipod->diskname,"/dev/sd%c",'a'+i);
#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) \
|| defined(__bsdi__) || defined(__DragonFly__)
sprintf(ipod->diskname,"/dev/da%d",i);
#elif defined(__APPLE__) && defined(__MACH__)
sprintf(ipod->diskname,"/dev/disk%d",i);
#else
#error No disk paths defined for this platform
#endif
if (ipod_open(ipod, 1) < 0) {
continue;
}
if (read_partinfo(ipod,1) < 0) {
continue;
}
if ((ipod->pinfo[0].start==0) || (ipod->pinfo[0].type != 0)) {
continue;
}
if (read_directory(ipod) < 0) {
continue;
}
ipod_version=(ipod->ipod_directory[0].vers>>8);
if (getmodel(ipod,ipod_version) < 0) {
continue;
}
#ifdef __WIN32__
printf("[INFO] Ipod found - %s (\"%s\") - disk device %d\n",
ipod->modelstr,ipod->macpod ? "macpod" : "winpod",i);
#else
printf("[INFO] Ipod found - %s (\"%s\") - %s\n",
ipod->modelstr,ipod->macpod ? "macpod" : "winpod",ipod->diskname);
#endif
n++;
strcpy(last_ipod,ipod->diskname);
ipod_close(ipod);
}
if (n==1) {
/* Remember the disk name */
strcpy(ipod->diskname,last_ipod);
}
return n;
}
static void put_int32le(uint32_t x, unsigned char* p)
{
p[0] = x & 0xff;
p[1] = (x >> 8) & 0xff;
p[2] = (x >> 16) & 0xff;
p[3] = (x >> 24) & 0xff;
}
int write_dos_partition_table(struct ipod_t* ipod)
{
unsigned char* p;
int i, n;
uint32_t type;
/* Only support 512-byte sectors at the moment */
if ( ipod->sector_size != 512 )
{
fprintf(stderr,"[ERR] Only ipods with 512 bytes per sector are supported.\n");
return -1;
}
/* Firstly zero the entire MBR */
memset(sectorbuf, 0, ipod->sector_size);
/* Now add the partition info */
for (i=0; i < 4 ; i++)
{
p = sectorbuf + 0x1be + i*16;
/* Ensure first partition is type 0, and second is 0xb */
if (i==0) { type = 0; }
else if (i==1) { type = 0xb; }
else { type = ipod->pinfo[i].type; }
put_int32le(type, p + 4);
put_int32le(ipod->pinfo[i].start, p + 8);
put_int32le(ipod->pinfo[i].size, p + 12);
}
/* Finally add the magic */
sectorbuf[0x1fe] = 0x55;
sectorbuf[0x1ff] = 0xaa;
if (ipod_seek(ipod, 0) < 0) {
fprintf(stderr,"[ERR] Seek failed writing MBR\n");
return -1;
}
/* Write MBR */
if ((n = ipod_write(ipod, sectorbuf, ipod->sector_size)) < 0) {
perror("[ERR] Write failed\n");
return -1;
}
return 0;
}
#ifndef RBUTIL
static inline uint32_t getuint32le(unsigned char* buf)
{
int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
return res;
}
/* testMarker and GetSecurityBlockKey based on code from BadBlocks and
Kingstone, posted at http://ipodlinux.org/Flash_Decryption
*/
static bool testMarker(int marker)
{
int mask, decrypt, temp1, temp2;
mask = (marker&0xff)|((marker&0xff)<<8)|((marker&0xff)<<16)|((marker&0xff)<<24);
decrypt = marker ^ mask;
temp1=(int)((unsigned int)decrypt>>24);
temp2=decrypt<<8;
if (temp1==0)
return false;
temp2=(int)((unsigned int)temp2>>24);
decrypt=decrypt<<16;
decrypt=(int)((unsigned int)decrypt>>24);
if ((temp1 < temp2) && (temp2 < decrypt))
{
temp1 = temp1 & 0xf;
temp2 = temp2 & 0xf;
decrypt = decrypt & 0xf;
if ((temp1 > temp2) && (temp2 > decrypt) && (decrypt != 0))
{
return true;
}
}
return false;
}
static int GetSecurityBlockKey(unsigned char *data, unsigned char* this_key)
{
int constant = 0x54c3a298;
int key=0;
int nkeys = 0;
int aMarker=0;
int pos=0;
int c, count;
int temp1;
static const int offset[8]={0x5,0x25,0x6f,0x69,0x15,0x4d,0x40,0x34};
for (c = 0; c < 8; c++)
{
pos = offset[c]*4;
aMarker = getuint32le(data + pos);
if (testMarker(aMarker))
{
if (c<7)
pos =(offset[c+1]*4)+4;
else
pos =(offset[0]*4)+4;
key=0;
temp1=aMarker;
for (count=0;count<2;count++){
int word = getuint32le(data + pos);
temp1 = aMarker;
temp1 = temp1^word;
temp1 = temp1^constant;
key = temp1;
pos = pos+4;
}
int r1=0x6f;
int r2=0;
int r12;
int r14;
unsigned int r_tmp;
for (count=2;count<128;count=count+2){
r2=getuint32le(data+count*4);
r12=getuint32le(data+(count*4)+4);
r_tmp=(unsigned int)r12>>16;
r14=r2 | ((int)r_tmp);
r2=r2&0xffff;
r2=r2 | r12;
r1=r1^r14;
r1=r1+r2;
}
key=key^r1;
// Invert key, little endian
this_key[0] = key & 0xff;
this_key[1] = (key >> 8) & 0xff;
this_key[2] = (key >> 16) & 0xff;
this_key[3] = (key >> 24) & 0xff;
nkeys++;
}
}
return nkeys;
}
static int find_key(struct ipod_t* ipod, int aupd, unsigned char* key)
{
int n;
/* Firstly read the security block and find the RC4 key. This is
in the sector preceeding the AUPD image. */
fprintf(stderr, "[INFO] Reading security block at offset 0x%08x\n",ipod->ipod_directory[aupd].devOffset-ipod->sector_size);
if (ipod_seek(ipod, ipod->fwoffset+ipod->ipod_directory[aupd].devOffset-ipod->sector_size) < 0) {
return -1;
}
if ((n = ipod_read(ipod, sectorbuf, 512)) < 0) {
return -1;
}
n = GetSecurityBlockKey(sectorbuf, key);
if (n != 1)
{
fprintf(stderr, "[ERR] %d keys found in security block, can not continue\n",n);
return -1;
}
return 0;
}
int read_aupd(struct ipod_t* ipod, char* filename)
{
int length;
int i;
int outfile;
int n;
int aupd;
struct rc4_key_t rc4;
unsigned char key[4];
unsigned long chksum=0;
aupd = 0;
while ((aupd < ipod->nimages) && (ipod->ipod_directory[aupd].ftype != FTYPE_AUPD))
{
aupd++;
}
if (aupd == ipod->nimages)
{
fprintf(stderr,"[ERR] No AUPD image in firmware partition.\n");
return -1;
}
length = ipod->ipod_directory[aupd].len;
fprintf(stderr,"[INFO] Reading firmware (%d bytes)\n",length);
if (find_key(ipod, aupd, key) < 0)
{
return -1;
}
fprintf(stderr, "[INFO] Decrypting AUPD image with key %02x%02x%02x%02x\n",key[0],key[1],key[2],key[3]);
if (ipod_seek(ipod, ipod->fwoffset+ipod->ipod_directory[aupd].devOffset) < 0) {
return -1;
}
i = (length+ipod->sector_size-1) & ~(ipod->sector_size-1);
if ((n = ipod_read(ipod,sectorbuf,i)) < 0) {
return -1;
}
if (n < i) {
fprintf(stderr,"[ERR] Short read - requested %d bytes, received %d\n",
i,n);
return -1;
}
/* Perform the decryption - this is standard (A)RC4 */
matrixArc4Init(&rc4, key, 4);
matrixArc4(&rc4, sectorbuf, sectorbuf, length);
chksum = 0;
for (i = 0; i < (int)length; i++) {
/* add 8 unsigned bits but keep a 32 bit sum */
chksum += sectorbuf[i];
}
if (chksum != ipod->ipod_directory[aupd].chksum)
{
fprintf(stderr,"[ERR] Decryption failed - checksum error\n");
return -1;
}
fprintf(stderr,"[INFO] Decrypted OK (checksum matches header)\n");
outfile = open(filename,O_CREAT|O_TRUNC|O_WRONLY|O_BINARY,0666);
if (outfile < 0) {
fprintf(stderr,"[ERR] Couldn't open file %s\n",filename);
return -1;
}
n = write(outfile,sectorbuf,length);
if (n != length) {
fprintf(stderr,"[ERR] Write error - %d\n",n);
}
close(outfile);
return 0;
}
int write_aupd(struct ipod_t* ipod, char* filename)
{
unsigned int length;
int i;
int x;
int n;
int infile;
int newsize;
int aupd;
unsigned long chksum=0;
struct rc4_key_t rc4;
unsigned char key[4];
/* First check that the input file is the correct type for this ipod. */
infile=open(filename,O_RDONLY);
if (infile < 0) {
fprintf(stderr,"[ERR] Couldn't open input file %s\n",filename);
return -1;
}
length = filesize(infile);
newsize=(length+ipod->sector_size-1)&~(ipod->sector_size-1);
fprintf(stderr,"[INFO] Padding input file from 0x%08x to 0x%08x bytes\n",
length,newsize);
if (newsize > BUFFER_SIZE) {
fprintf(stderr,"[ERR] Input file too big for buffer\n");
if (infile >= 0) close(infile);
return -1;
}
/* Find aupd image number */
aupd = 0;
while ((aupd < ipod->nimages) && (ipod->ipod_directory[aupd].ftype != FTYPE_AUPD))
{
aupd++;
}
if (aupd == ipod->nimages)
{
fprintf(stderr,"[ERR] No AUPD image in firmware partition.\n");
return -1;
}
if (length != ipod->ipod_directory[aupd].len)
{
fprintf(stderr,"[ERR] AUPD image (%d bytes) differs in size to %s (%d bytes).\n",
ipod->ipod_directory[aupd].len, filename, length);
return -1;
}
if (find_key(ipod, aupd, key) < 0)
{
return -1;
}
fprintf(stderr, "[INFO] Encrypting AUPD image with key %02x%02x%02x%02x\n",key[0],key[1],key[2],key[3]);
/* We now know we have enough space, so write it. */
fprintf(stderr,"[INFO] Reading input file...\n");
n = read(infile,sectorbuf,length);
if (n < 0) {
fprintf(stderr,"[ERR] Couldn't read input file\n");
close(infile);
return -1;
}
close(infile);
/* Pad the data with zeros */
memset(sectorbuf+length,0,newsize-length);
/* Calculate the new checksum (before we encrypt) */
chksum = 0;
for (i = 0; i < (int)length; i++) {
/* add 8 unsigned bits but keep a 32 bit sum */
chksum += sectorbuf[i];
}
/* Perform the encryption - this is standard (A)RC4 */
matrixArc4Init(&rc4, key, 4);
matrixArc4(&rc4, sectorbuf, sectorbuf, length);
if (ipod_seek(ipod, ipod->fwoffset+ipod->ipod_directory[aupd].devOffset) < 0) {
fprintf(stderr,"[ERR] Seek failed\n");
return -1;
}
if ((n = ipod_write(ipod,sectorbuf,newsize)) < 0) {
perror("[ERR] Write failed\n");
return -1;
}
if (n < newsize) {
fprintf(stderr,"[ERR] Short write - requested %d bytes, received %d\n"
,newsize,n);
return -1;
}
fprintf(stderr,"[INFO] Wrote %d bytes to firmware partition\n",n);
x = ipod->diroffset % ipod->sector_size;
/* Read directory */
if (ipod_seek(ipod, ipod->start + ipod->diroffset - x) < 0) { return -1; }
n=ipod_read(ipod, sectorbuf, ipod->sector_size);
if (n < 0) { return -1; }
/* Update checksum */
fprintf(stderr,"[INFO] Updating checksum to 0x%08x (was 0x%08x)\n",(unsigned int)chksum,le2int(sectorbuf + x + aupd*40 + 28));
int2le(chksum,sectorbuf+x+aupd*40+28);
/* Write directory */
if (ipod_seek(ipod, ipod->start + ipod->diroffset - x) < 0) { return -1; }
n=ipod_write(ipod, sectorbuf, ipod->sector_size);
if (n < 0) { return -1; }
return 0;
}
#endif
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