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/*
This file is part of Android File Transfer For Linux.
Copyright (C) 2015-2020 Vladimir Menshakov
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <mtp/ptp/Device.h>
#include <mtp/ptp/Response.h>
#include <mtp/ptp/Container.h>
#include <mtp/ptp/Messages.h>
#include <mtp/log.h>
#include <usb/Context.h>
#include <usb/Device.h>
#include <usb/Interface.h>
#include <mtp/ptp/OperationRequest.h>
#include <mtp/usb/Request.h>
#include <stdexcept>
namespace mtp
{
Device::Device(usb::BulkPipePtr pipe): _packeter(pipe)
{ }
SessionPtr Device::OpenSession(u32 sessionId, int timeout)
{
OperationRequest req(OperationCode::OpenSession, 0, sessionId);
Container container(req);
_packeter.Write(container.Data, timeout);
ByteArray data, response;
ResponseType code;
_packeter.Read(0, data, code, response, timeout);
//HexDump("payload", data);
return std::make_shared<Session>(_packeter.GetPipe(), sessionId);
}
u8 Device::GetInterfaceStringIndex(usb::DeviceDescriptorPtr desc, u8 number)
{
static const u16 DT_INTERFACE = 4;
ByteArray descData = desc->GetDescriptor();
HexDump("descriptor", descData);
size_t offset = 0;
while(offset < descData.size())
{
u8 len = descData.at(offset + 0);
u8 type = descData.at(offset + 1);
if (len < 2)
throw std::runtime_error("invalid descriptor length");
if (type == DT_INTERFACE && len >= 9 && descData.at(offset + 2) == number)
return descData.at(offset + 8);
offset += len;
}
throw std::runtime_error("no interface descriptor found");
}
DevicePtr Device::Open(usb::ContextPtr ctx, usb::DeviceDescriptorPtr desc, bool claimInterface, bool resetDevice)
{
debug("probing device ", hex(desc->GetVendorId(), 4), ":", hex(desc->GetProductId(), 4));
usb::DevicePtr device = desc->TryOpen(ctx);
if (resetDevice && device) {
device->Reset();
device.reset();
device = desc->TryOpen(ctx);
}
if (!device) {
debug("descriptor->TryOpen() failed");
return nullptr;
}
int confs = desc->GetConfigurationsCount();
debug("configurations: ", confs);
for(int i = 0; i < confs; ++i)
{
usb::ConfigurationPtr conf = desc->GetConfiguration(i);
int interfaces = conf->GetInterfaceCount();
if (interfaces == 0) {
debug("device not configured (no interfaces), setting configuration now...");
int index = conf->GetIndex();
conf.reset();
device->SetConfiguration(index);
debug("device configured, retrieving configuration descriptor again...");
conf = desc->GetConfiguration(i);
interfaces = conf->GetInterfaceCount();
}
debug("interfaces: ", interfaces);
for(int j = 0; j < interfaces; ++j)
{
usb::InterfacePtr iface = conf->GetInterface(device, conf, j, 0);
debug("Device usb interface: ", i, ':', j, ", index: ", iface->GetIndex(), ", endpoints: ", iface->GetEndpointsCount());
#ifdef USB_BACKEND_LIBUSB
std::string name = iface->GetName();
#else
ByteArray data = usb::DeviceRequest(device).GetDescriptor(usb::DescriptorType::String, 0, 0);
HexDump("languages", data);
if (data.size() < 4 || data[1] != (u8)usb::DescriptorType::String)
continue;
u16 langId = data[2] | ((u16)data[3] << 8);
std::string name;
try
{
data = usb::DeviceRequest(device).GetDescriptor(usb::DescriptorType::String, static_cast<u8>(usb::DeviceRequest::Request::GetOSStringDescriptor), langId);
HexDump("OSStringDescriptor", data);
if (data.size() < 0x12 || data.at(2) != 'M' || data.at(4) != 'S' || data.at(6) != 'F' || data.at(8) != 'T')
throw std::runtime_error("invalid OSString descriptor");
u8 command = data.at(0x10);
debug("vendor code: 0x", hex(command, 2));
//getting extended OS compat descriptor
data.resize(255);
device->ReadControl(static_cast<u8>(usb::RequestType::DeviceToHost | usb::RequestType::Vendor | usb::RequestType::Device),
command, 0, 4, data, usb::BaseRequest::DefaultTimeout);
HexDump("extended compat id os feature desctriptor", data);
if (data.at(0x12) == 'M' && data.at(0x13) == 'T' && data.at(0x14) == 'P')
name = "MTP";
}
catch (const std::exception & ex)
{ debug("winusb handshake failed: ", ex.what()); }
if (name.find("MTP") == name.npos)
{
auto interfaceStringIndex = GetInterfaceStringIndex(desc, j);
data = usb::DeviceRequest(device).GetDescriptor(usb::DescriptorType::String, interfaceStringIndex, langId);
HexDump("interface name", data);
if (data.size() < 4 || data[1] != (u8)usb::DescriptorType::String)
continue;
u8 len = data[0];
InputStream stream(data, 2);
name = stream.ReadString((len - 2) / 2);
}
#endif
//device->SetConfiguration(i);
if (name.find("MTP") != name.npos)
{
usb::InterfaceTokenPtr token = claimInterface? device->ClaimInterface(iface): nullptr;
usb::BulkPipePtr pipe = usb::BulkPipe::Create(device, conf, iface, token);
return std::make_shared<Device>(pipe);
} else
debug("skipping interface with name ", name);
if (iface->GetClass() == 6 && iface->GetSubclass() == 1)
{
usb::InterfaceTokenPtr token = claimInterface? device->ClaimInterface(iface): nullptr;
usb::BulkPipePtr pipe = usb::BulkPipe::Create(device, conf, iface, token);
return std::make_shared<Device>(pipe);
}
}
}
return nullptr;
}
DevicePtr Device::FindFirst(const std::string & filter, bool claimInterface, bool resetDevice)
{
usb::ContextPtr ctx(new usb::Context);
return FindFirst(ctx, filter, claimInterface, resetDevice);
}
DevicePtr Device::FindFirst(usb::ContextPtr ctx, const std::string & filter, bool claimInterface, bool resetDevice)
{
int vendor, product;
bool useUsbVendorProduct = true;
if (sscanf(filter.c_str(), "%x:%x", &vendor, &product) != 2)
{
vendor = product = -1;
useUsbVendorProduct = false;
}
for (usb::DeviceDescriptorPtr desc : ctx->GetDevices())
try
{
if (vendor >= 0 && product >= 0)
{
if (desc->GetVendorId() != vendor || desc->GetProductId() != product)
continue;
}
auto device = Open(ctx, desc, claimInterface, resetDevice);
if (device && (useUsbVendorProduct || device->Matches(filter)))
return device;
}
catch(const std::exception &ex)
{ error("Device::Find failed:", ex.what()); }
return nullptr;
}
msg::DeviceInfo Device::GetInfo()
{ return Session::GetDeviceInfo(_packeter, /*transactionId=*/0); }
bool Device::Matches(const std::string & filter)
{
if (filter.empty())
return true;
auto di = GetInfo();
return di.Matches(filter);
}
}
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