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/*
* asr.h
* Functions for handling asr connections
*
* Copyright (c) 2010 Joshua Hill. 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libimobiledevice/libimobiledevice.h>
#include <openssl/sha.h>
#include "asr.h"
#include "idevicerestore.h"
#define ASR_VERSION 1
#define ASR_STREAM_ID 1
#define ASR_PORT 12345
#define ASR_BUFFER_SIZE 65536
#define ASR_FEC_SLICE_STRIDE 40
#define ASR_PACKETS_PER_FEC 25
#define ASR_PAYLOAD_PACKET_SIZE 1450
#define ASR_CHECKSUM_CHUNK_SIZE 131072
int asr_open_with_timeout(idevice_t device, asr_client_t* asr) {
int i = 0;
int attempts = 10;
idevice_connection_t connection = NULL;
idevice_error_t device_error = IDEVICE_E_SUCCESS;
*asr = NULL;
if (device == NULL) {
return -1;
}
debug("Connecting to ASR\n");
for (i = 1; i <= attempts; i++) {
device_error = idevice_connect(device, ASR_PORT, &connection);
if (device_error == IDEVICE_E_SUCCESS) {
break;
}
if (i >= attempts) {
error("ERROR: Unable to connect to ASR client\n");
return -1;
}
sleep(2);
debug("Retrying connection...\n");
}
asr_client_t asr_loc = (asr_client_t)malloc(sizeof(struct asr_client));
memset(asr_loc, '\0', sizeof(struct asr_client));
asr_loc->connection = connection;
/* receive Initiate command message */
plist_t data = NULL;
asr_loc->checksum_chunks = 0;
if (asr_receive(asr_loc, &data) < 0) {
error("ERROR: Unable to receive data from ASR\n");
asr_free(asr_loc);
plist_free(data);
return -1;
}
plist_t node;
node = plist_dict_get_item(data, "Command");
if (node && (plist_get_node_type(node) == PLIST_STRING)) {
char* strval = NULL;
plist_get_string_val(node, &strval);
if (strval && (strcmp(strval, "Initiate") != 0)) {
error("ERROR: unexpected ASR plist received:\n");
debug_plist(data);
plist_free(data);
asr_free(asr_loc);
return -1;
}
}
node = plist_dict_get_item(data, "Checksum Chunks");
if (node && (plist_get_node_type(node) == PLIST_BOOLEAN)) {
plist_get_bool_val(node, &(asr_loc->checksum_chunks));
}
plist_free(data);
*asr = asr_loc;
return 0;
}
int asr_receive(asr_client_t asr, plist_t* data) {
uint32_t size = 0;
char* buffer = NULL;
plist_t request = NULL;
idevice_error_t device_error = IDEVICE_E_SUCCESS;
*data = NULL;
buffer = (char*) malloc(ASR_BUFFER_SIZE);
if (buffer == NULL) {
error("ERROR: Unable to allocate memory for ASR receive buffer\n");
return -1;
}
memset(buffer, '\0', ASR_BUFFER_SIZE);
device_error = idevice_connection_receive(asr->connection, buffer, ASR_BUFFER_SIZE, &size);
if (device_error != IDEVICE_E_SUCCESS) {
error("ERROR: Unable to receive data from ASR\n");
free(buffer);
return -1;
}
plist_from_xml(buffer, size, &request);
*data = request;
debug("Received %d bytes:\n", size);
if (idevicerestore_debug)
debug_plist(request);
free(buffer);
return 0;
}
int asr_send(asr_client_t asr, plist_t* data) {
uint32_t size = 0;
char* buffer = NULL;
plist_to_xml(data, &buffer, &size);
if (asr_send_buffer(asr, buffer, size) < 0) {
error("ERROR: Unable to send plist to ASR\n");
free(buffer);
return -1;
}
debug("Sent %d bytes:\n", size);
// TODO: Actually figure out the problem with the commented out code below, instead of just ditching it...
/*if (idevicerestore_debug)
debug_plist(*data);
free(buffer);*/
return 0;
}
int asr_send_buffer(asr_client_t asr, const char* data, uint32_t size) {
uint32_t bytes = 0;
idevice_error_t device_error = IDEVICE_E_SUCCESS;
device_error = idevice_connection_send(asr->connection, data, size, &bytes);
if (device_error != IDEVICE_E_SUCCESS || bytes != size) {
error("ERROR: Unable to send data to ASR\n");
return -1;
}
debug("Sent %d bytes buffer\n", bytes);
return 0;
}
void asr_free(asr_client_t asr) {
if (asr != NULL) {
if (asr->connection != NULL) {
idevice_disconnect(asr->connection);
asr->connection = NULL;
}
free(asr);
asr = NULL;
}
}
int asr_perform_validation(asr_client_t asr, const char* filesystem) {
FILE* file = NULL;
uint64_t length = 0;
char* command = NULL;
plist_t node = NULL;
plist_t packet = NULL;
plist_t packet_info = NULL;
plist_t payload_info = NULL;
int attempts = 0;
file = fopen(filesystem, "rb");
if (file == NULL) {
return -1;
}
fseek(file, 0, SEEK_END);
length = ftell(file);
fseek(file, 0, SEEK_SET);
payload_info = plist_new_dict();
plist_dict_insert_item(payload_info, "Port", plist_new_uint(1));
plist_dict_insert_item(payload_info, "Size", plist_new_uint(length));
packet_info = plist_new_dict();
if (asr->checksum_chunks) {
plist_dict_insert_item(packet_info, "Checksum Chunk Size", plist_new_uint(ASR_CHECKSUM_CHUNK_SIZE));
}
plist_dict_insert_item(packet_info, "FEC Slice Stride", plist_new_uint(ASR_FEC_SLICE_STRIDE));
plist_dict_insert_item(packet_info, "Packet Payload Size", plist_new_uint(ASR_PAYLOAD_PACKET_SIZE));
plist_dict_insert_item(packet_info, "Packets Per FEC", plist_new_uint(ASR_PACKETS_PER_FEC));
plist_dict_insert_item(packet_info, "Payload", payload_info);
plist_dict_insert_item(packet_info, "Stream ID", plist_new_uint(ASR_STREAM_ID));
plist_dict_insert_item(packet_info, "Version", plist_new_uint(ASR_VERSION));
if (asr_send(asr, packet_info)) {
error("ERROR: Unable to sent packet information to ASR\n");
plist_free(packet_info);
return -1;
}
plist_free(packet_info);
while (1) {
if (asr_receive(asr, &packet) < 0) {
error("ERROR: Unable to receive validation packet\n");
return -1;
}
if (packet == NULL) {
if (attempts < 5) {
info("Retrying to receive validation packet... %d\n", attempts);
attempts++;
sleep(1);
continue;
}
}
attempts = 0;
node = plist_dict_get_item(packet, "Command");
if (!node || plist_get_node_type(node) != PLIST_STRING) {
error("ERROR: Unable to find command node in validation request\n");
return -1;
}
plist_get_string_val(node, &command);
if (!strcmp(command, "OOBData")) {
asr_handle_oob_data_request(asr, packet, file);
plist_free(packet);
} else if(!strcmp(command, "Payload")) {
plist_free(packet);
break;
} else {
error("ERROR: Unknown command received from ASR\n");
plist_free(packet);
return -1;
}
}
return 0;
}
int asr_handle_oob_data_request(asr_client_t asr, plist_t packet, FILE* file) {
char* oob_data = NULL;
uint64_t oob_offset = 0;
uint64_t oob_length = 0;
plist_t oob_length_node = NULL;
plist_t oob_offset_node = NULL;
oob_length_node = plist_dict_get_item(packet, "OOB Length");
if (!oob_length_node || PLIST_UINT != plist_get_node_type(oob_length_node)) {
error("ERROR: Unable to find OOB data length\n");
return -1;
}
plist_get_uint_val(oob_length_node, &oob_length);
oob_offset_node = plist_dict_get_item(packet, "OOB Offset");
if (!oob_offset_node || PLIST_UINT != plist_get_node_type(oob_offset_node)) {
error("ERROR: Unable to find OOB data offset\n");
return -1;
}
plist_get_uint_val(oob_offset_node, &oob_offset);
oob_data = (char*) malloc(oob_length);
if (oob_data == NULL) {
error("ERROR: Out of memory\n");
plist_free(packet);
return -1;
}
fseek(file, oob_offset, SEEK_SET);
if (fread(oob_data, 1, oob_length, file) != oob_length) {
error("ERROR: Unable to read OOB data from filesystem offset\n");
plist_free(packet);
free(oob_data);
return -1;
}
if (asr_send_buffer(asr, oob_data, oob_length) < 0) {
error("ERROR: Unable to send OOB data to ASR\n");
plist_free(packet);
free(oob_data);
return -1;
}
free(oob_data);
return 0;
}
int asr_send_payload(asr_client_t asr, const char* filesystem) {
int i = 0;
char data[ASR_PAYLOAD_PACKET_SIZE];
FILE* file = NULL;
uint32_t bytes = 0;
uint32_t count = 0;
uint32_t length = 0;
double progress = 0;
file = fopen(filesystem, "rb");
if (file == NULL) {
return -1;
}
fseek(file, 0, SEEK_END);
length = ftell(file);
fseek(file, 0, SEEK_SET);
int chunk = 0;
int add_checksum = 0;
SHA_CTX sha1;
if (asr->checksum_chunks) {
SHA1_Init(&sha1);
}
int size = 0;
for (i = length; i > 0; i -= size) {
size = ASR_PAYLOAD_PACKET_SIZE;
if (i < ASR_PAYLOAD_PACKET_SIZE) {
size = i;
}
if (add_checksum) {
add_checksum = 0;
}
if (asr->checksum_chunks && ((chunk + size) >= ASR_CHECKSUM_CHUNK_SIZE)) {
// reduce packet size to match checksum chunk size
size -= ((chunk + size) - ASR_CHECKSUM_CHUNK_SIZE);
add_checksum = 1;
}
if (fread(data, 1, size, file) != (unsigned int) size) {
error("Error reading filesystem\n");
fclose(file);
return -1;
}
if (asr_send_buffer(asr, data, size) < 0) {
error("ERROR: Unable to send filesystem payload\n");
fclose(file);
return -1;
}
if (asr->checksum_chunks) {
SHA1_Update(&sha1, data, size);
chunk += size;
if (add_checksum) {
// get sha1 of last chunk
SHA1_Final(data, &sha1);
// send checksum
if (asr_send_buffer(asr, data, 20) < 0) {
error("ERROR: Unable to send chunk checksum\n");
fclose(file);
return -1;
}
// reset SHA1 context
SHA1_Init(&sha1);
// reset chunk byte counter
chunk = 0;
}
}
bytes += size;
progress = ((double) bytes/ (double) length) * 100.0;
print_progress_bar(progress);
}
// if last chunk wasn't terminated with a checksum we do it here
if (asr->checksum_chunks && !add_checksum) {
// get sha1 of last chunk
SHA1_Final(data, &sha1);
// send checksum
if (asr_send_buffer(asr, data, 20) < 0) {
error("ERROR: Unable to send chunk checksum\n");
fclose(file);
return -1;
}
}
fclose(file);
return 0;
}
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