adb: add host tool to check for WinUSB descriptor. (27512c9e) · Commits · e / os / android_system_core

adb/tools/Android.bp

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		// Copyright (C) 2017 The Android Open Source Project
		//
		// Licensed under the Apache License, Version 2.0 (the "License");
		// you may not use this file except in compliance with the License.
		// You may obtain a copy of the License at
		//
		// http://www.apache.org/licenses/LICENSE-2.0
		//
		// Unless required by applicable law or agreed to in writing, software
		// distributed under the License is distributed on an "AS IS" BASIS,
		// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		// See the License for the specific language governing permissions and
		// limitations under the License.

		cc_binary_host {
		name: "check_ms_os_desc",

		defaults: ["adb_defaults"],

		srcs: [
		"check_ms_os_desc.cpp",
		],

		static_libs: [
		"libbase",
		"libusb",
		],

		stl: "libc++_static",

		dist: {
		targets: [
		"sdk",
		],
		},
		}

adb/tools/check_ms_os_desc.cpp

0 → 100644

+221 −0

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		/*
		* Copyright (C) 2019 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#include <err.h>
		#include <stdio.h>
		#include <unistd.h>

		#include <optional>
		#include <string>
		#include <vector>

		#include <libusb/libusb.h>

		static bool is_adb_device(libusb_device* device) {
		libusb_device_descriptor device_desc;
		libusb_get_device_descriptor(device, &device_desc);
		if (device_desc.bDeviceClass != 0) {
		return false;
		}

		libusb_config_descriptor* config_desc;
		int rc = libusb_get_active_config_descriptor(device, &config_desc);
		if (rc != 0) {
		fprintf(stderr, "failed to get config descriptor for device %u:%u: %s\n",
		libusb_get_bus_number(device), libusb_get_port_number(device),
		libusb_error_name(rc));
		return false;
		}

		for (size_t i = 0; i < config_desc->bNumInterfaces; ++i) {
		const libusb_interface* interface = &config_desc->interface[i];
		for (int j = 0; j < interface->num_altsetting; ++j) {
		const libusb_interface_descriptor* interface_descriptor = &interface->altsetting[j];
		if (interface_descriptor->bInterfaceClass == 0xff &&
		interface_descriptor->bInterfaceSubClass == 0x42 &&
		interface_descriptor->bInterfaceProtocol == 1) {
		return true;
		}
		}
		}

		return false;
		}

		static std::optional<std::vector<uint8_t>> get_descriptor(libusb_device_handle* handle,
		uint8_t type, uint8_t index,
		uint16_t length) {
		std::vector<uint8_t> result;
		result.resize(length);
		int rc = libusb_get_descriptor(handle, type, index, result.data(), result.size());
		if (rc < 0) {
		fprintf(stderr, "libusb_get_descriptor failed: %s\n", libusb_error_name(rc));
		return std::nullopt;
		}
		result.resize(rc);
		return result;
		}

		static std::optional<std::string> get_string_descriptor(libusb_device_handle* handle,
		uint8_t index) {
		std::string result;
		result.resize(4096);
		int rc = libusb_get_string_descriptor_ascii(
		handle, index, reinterpret_cast<uint8_t*>(result.data()), result.size());
		if (rc < 0) {
		fprintf(stderr, "libusb_get_string_descriptor_ascii failed: %s\n", libusb_error_name(rc));
		return std::nullopt;
		}
		result.resize(rc);
		return result;
		}

		static void check_ms_os_desc_v1(libusb_device_handle* device_handle, const std::string& serial) {
		auto os_desc = get_descriptor(device_handle, 0x03, 0xEE, 0x12);
		if (!os_desc) {
		errx(1, "failed to retrieve MS OS descriptor");
		}

		if (os_desc->size() != 0x12) {
		errx(1, "os descriptor size mismatch");
		}

		if (memcmp(os_desc->data() + 2, u"MSFT100\0", 14) != 0) {
		errx(1, "os descriptor signature mismatch");
		}

		uint8_t vendor_code = (*os_desc)[16];
		uint8_t pad = (*os_desc)[17];

		if (pad != 0) {
		errx(1, "os descriptor padding non-zero");
		}

		std::vector<uint8_t> data;
		data.resize(0x10);
		int rc = libusb_control_transfer(device_handle, 0xC0, vendor_code, 0x00, 0x04, data.data(),
		data.size(), 0);
		if (rc != 0x10) {
		errx(1, "failed to retrieve MS OS v1 compat descriptor header: %s", libusb_error_name(rc));
		}

		struct __attribute__((packed)) ms_os_desc_v1_header {
		uint32_t dwLength;
		uint16_t bcdVersion;
		uint16_t wIndex;
		uint8_t bCount;
		uint8_t reserved[7];
		};
		static_assert(sizeof(ms_os_desc_v1_header) == 0x10);

		ms_os_desc_v1_header hdr;
		memcpy(&hdr, data.data(), data.size());

		data.resize(hdr.dwLength);
		rc = libusb_control_transfer(device_handle, 0xC0, vendor_code, 0x00, 0x04, data.data(),
		data.size(), 0);
		if (static_cast<size_t>(rc) != data.size()) {
		errx(1, "failed to retrieve MS OS v1 compat descriptor: %s", libusb_error_name(rc));
		}

		memcpy(&hdr, data.data(), data.size());

		struct __attribute__((packed)) ms_os_desc_v1_function {
		uint8_t bFirstInterfaceNumber;
		uint8_t reserved1;
		uint8_t compatibleID[8];
		uint8_t subCompatibleID[8];
		uint8_t reserved2[6];
		};

		if (sizeof(ms_os_desc_v1_header) + hdr.bCount * sizeof(ms_os_desc_v1_function) != data.size()) {
		errx(1, "MS OS v1 compat descriptor size mismatch");
		}

		for (int i = 0; i < hdr.bCount; ++i) {
		ms_os_desc_v1_function function;
		memcpy(&function,
		data.data() + sizeof(ms_os_desc_v1_header) + i * sizeof(ms_os_desc_v1_function),
		sizeof(function));
		if (memcmp("WINUSB\0\0", function.compatibleID, 8) == 0) {
		return;
		}
		}

		errx(1, "failed to find v1 MS OS descriptor specifying WinUSB for device %s", serial.c_str());
		}

		int main(int argc, char** argv) {
		libusb_context* ctx;
		if (libusb_init(&ctx) != 0) {
		errx(1, "failed to initialize libusb context");
		}

		libusb_device** device_list = nullptr;
		ssize_t device_count = libusb_get_device_list(ctx, &device_list);
		if (device_count < 0) {
		errx(1, "libusb_get_device_list failed");
		}

		const char* expected_serial = getenv("ANDROID_SERIAL");
		bool found = false;

		for (ssize_t i = 0; i < device_count; ++i) {
		libusb_device* device = device_list[i];
		if (!is_adb_device(device)) {
		continue;
		}

		libusb_device_handle* device_handle = nullptr;
		int rc = libusb_open(device, &device_handle);
		if (rc != 0) {
		fprintf(stderr, "failed to open device %u:%u: %s\n", libusb_get_bus_number(device),
		libusb_get_port_number(device), libusb_error_name(rc));
		continue;
		}

		libusb_device_descriptor device_desc;
		libusb_get_device_descriptor(device, &device_desc);

		std::optional<std::string> serial =
		get_string_descriptor(device_handle, device_desc.iSerialNumber);
		if (!serial) {
		errx(1, "failed to get serial for device %u:%u", libusb_get_bus_number(device),
		libusb_get_port_number(device));
		}

		if (expected_serial && *serial != expected_serial) {
		fprintf(stderr, "skipping %s (wanted %s)\n", serial->c_str(), expected_serial);
		continue;
		}

		// Check for MS OS Descriptor v1.
		// https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpeusb/c2f351f9-84d2-4a1b-9fe3-a6ca195f84d0
		fprintf(stderr, "fetching v1 OS descriptor from device %s\n", serial->c_str());
		check_ms_os_desc_v1(device_handle, *serial);
		fprintf(stderr, "found v1 OS descriptor for device %s\n", serial->c_str());

		// TODO: Read BOS for MS OS Descriptor 2.0 descriptors:
		// http://download.microsoft.com/download/3/5/6/3563ED4A-F318-4B66-A181-AB1D8F6FD42D/MS_OS_2_0_desc.docx

		found = true;
		}

		if (expected_serial && !found) {
		errx(1, "failed to find device with serial %s", expected_serial);
		}
		return 0;
		}