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/*
* usbmux.c
* Interprets the usb multiplexing protocol used by the iPhone.
*
* Copyright (c) 2008 Zack C. 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 <sys/types.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "usbmux.h"
extern int debug;
usbmux_tcp_header *new_mux_packet(uint16 s_port, uint16 d_port) {
usbmux_tcp_header *conn = (usbmux_tcp_header*)malloc(sizeof(usbmux_tcp_header));
conn->type = htonl(6);
conn->length = 28;
conn->sport = htons(s_port);
conn->dport = htons(d_port);
conn->scnt = 0;
conn->ocnt = 0;
conn->offset = 0x50;
conn->window = htons(0x0200);
conn->nullnull = 0x0000;
conn->length16 = 28;
return conn;
}
usbmux_version_header *version_header() {
usbmux_version_header *version = (usbmux_version_header*)malloc(sizeof(usbmux_version_header));
version->type = 0;
version->length = htonl(20);
version->major = htonl(1);
version->minor = 0;
version->allnull = 0;
return version;
}
/* mux_connect(phone, s_port, d_port)
* This is a higher-level USBMuxTCP-type function.
* phone: the iPhone to initialize a connection on.
* s_port: the source port
* d_port: the destination port -- 0xf27e for lockdownd.
* Initializes a connection on phone, with source port s_port and destination port d_port
*
* Returns a mux TCP header for the connection which is used for tracking and data transfer.
*/
usbmux_tcp_header *mux_connect(iPhone *phone, uint16 s_port, uint16 d_port) {
if (!phone || !s_port || !d_port) return NULL;
int bytes = 0;
// Initialize connection stuff
usbmux_tcp_header *new_connection;
new_connection = new_mux_packet(s_port, d_port);
usbmux_tcp_header *response;
response = (usbmux_tcp_header*)malloc(sizeof(usbmux_tcp_header));
// blargg
if (new_connection) {
new_connection->tcp_flags = 0x02;
new_connection->length = htonl(new_connection->length);
new_connection->length16 = htons(new_connection->length16);
if (send_to_phone(phone, (char*)new_connection, sizeof(*new_connection)) >= 0) {
bytes = recv_from_phone(phone, (char*)response, sizeof(*response));
if (response->tcp_flags != 0x12) return NULL;
else {
new_connection->tcp_flags = 0x10;
new_connection->scnt = 1;
new_connection->ocnt = 1;
return new_connection;
}
} else {
return NULL;
}
}
// if we get to this point it's probably bad
return NULL;
}
/* mux_close_connection(phone, connection)
* This is a higher-level USBmuxTCP-type function.
* phone: the iPhone to close a connection with.
* connection: the connection to close.
*
* Doesn't return anything; WILL FREE THE CONNECTION'S MEMORY!!!
*/
void mux_close_connection(iPhone *phone, usbmux_tcp_header *connection) {
if (!phone || !connection) return;
connection->tcp_flags = 0x04;
connection->scnt = htonl(connection->scnt);
connection->ocnt = htonl(connection->ocnt);
int bytes = 0;
bytes = usb_bulk_write(phone->device, BULKOUT, (char*)connection, sizeof(*connection), 800);
bytes = usb_bulk_read(phone->device, BULKIN, (char*)connection, sizeof(*connection), 800);
free(connection);
}
/* mux_send(phone, connection, data, datalen)
* This is a higher-level USBMuxTCP-like function.
* phone: the iPhone to send to.
* connection: the connection we're sending data on.
* data: a pointer to the data to send.
* datalen: how much data we're sending.
*
* Returns number of bytes sent, minus the header (28), or -1 on error.
*/
int mux_send(iPhone *phone, usbmux_tcp_header *connection, char *data, uint32 datalen) {
if (!phone || !connection || !data || datalen == 0) return -1;
// connection->scnt and connection->ocnt should already be in host notation...
// we don't need to change them juuuust yet.
int bytes = 0;
if (debug) printf("mux_send(): client wants to send %i bytes\n", datalen);
char *buffer = (char*)malloc(sizeof(*connection) + datalen + 2); // allow 2 bytes of safety padding
// Set the length and pre-emptively htonl/htons it
connection->length = htonl(sizeof(*connection) + datalen);
connection->length16 = htons(sizeof(*connection) + datalen);
// Put scnt and ocnt into big-endian notation
connection->scnt = htonl(connection->scnt);
connection->ocnt = htonl(connection->ocnt);
// Concatenation of stuff in the buffer.
memcpy(buffer, connection, sizeof(*connection));
memcpy(buffer+sizeof(*connection)/*+sizeof(datalen)*/, data, datalen);
// We have a buffer full of data, we should now send it to the phone.
if (debug) printf("actually sending %i bytes of data at %x\n", sizeof(*connection)+datalen, buffer);
bytes = send_to_phone(phone, buffer, sizeof(*connection)+datalen);
// Now that we've sent it off, we can clean up after our sloppy selves.
free(buffer);
// Re-calculate scnt and ocnt
connection->scnt = ntohl(connection->scnt) + datalen;
connection->ocnt = ntohl(connection->ocnt);
// Revert lengths
connection->length = ntohl(connection->length);
connection->length16 = ntohs(connection->length16);
// Now return the bytes.
if (bytes < sizeof(*connection)+datalen) {
return -1; // blah
} else {
return bytes - 28; // actual length sent. :/
}
return bytes; // or something
}
/* mux_recv(phone, connection, data, datalen)
* This is a higher-level USBMuxTCP-like function
* phone: the phone to receive data from.
* connection: the connection to receive data on.
* data: where to put the data we receive.
* datalen: how much data to read.
*
* Returns: how many bytes were read, or -1 if something bad happens.
*/
int mux_recv(iPhone *phone, usbmux_tcp_header *connection, char *data, uint32 datalen) {
char *buffer = (char*)malloc(sizeof(*connection) + sizeof(datalen) + datalen);
int bytes = 0, my_datalen = 0;
if (debug) printf("mux_recv: datalen == %i\n", datalen);
bytes = recv_from_phone(phone, buffer, sizeof(*connection) + datalen);
if (debug) printf("mux_recv: bytes == %i\n", bytes);
if (bytes < datalen) {
if (bytes < 28) {
// if they didn't do that annoying thing, something else mighta happened.
if (debug) printf("mux_recv: bytes too low anyway!\n");
free(buffer);
return -1;
} else if (bytes == 28) { // no data...
free(buffer);
return 0;
} else { // bytes > 28
my_datalen = ntohl(buffer[4]) - 28;
connection->ocnt += my_datalen;
memcpy(data, buffer+28, bytes - 28);
free(buffer);
if (debug) printf("mux_recv: bytes received: %i\n", bytes - 28);
return bytes - 28;
}
} else {// all's good, they didn't do anything bonky.
my_datalen = ntohl(buffer[4]) - 28;
connection->ocnt += my_datalen;
if (bytes == (datalen+28)) memcpy(data, buffer+28, datalen);
else if (bytes == datalen) memcpy(data, buffer+28, datalen-28);
free(buffer);
if (debug) printf("mux_recv: bytes received: %i\n", bytes - 28);
return bytes - 28;
}
return bytes;
}
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