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android13/packages/modules/adb/tools/check_ms_os_desc.cpp

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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));
}
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());
}
static void check_ms_os_desc_v2(libusb_device_handle* device_handle, const std::string& serial) {
libusb_bos_descriptor* bos;
int rc = libusb_get_bos_descriptor(device_handle, &bos);
if (rc != 0) {
fprintf(stderr, "failed to get bos descriptor for device %s\n", serial.c_str());
return;
}
for (size_t i = 0; i < bos->bNumDeviceCaps; ++i) {
libusb_bos_dev_capability_descriptor* desc = bos->dev_capability[i];
if (desc->bDescriptorType != LIBUSB_DT_DEVICE_CAPABILITY) {
errx(1, "invalid BOS descriptor type: %d", desc->bDescriptorType);
}
if (desc->bDevCapabilityType != 0x05 /* PLATFORM */) {
fprintf(stderr, "skipping non-platform dev capability: %#02x\n",
desc->bDevCapabilityType);
continue;
}
if (desc->bLength < sizeof(*desc) + 16) {
errx(1, "received device capability descriptor not long enough to contain a UUID?");
}
char uuid[16];
memcpy(uuid, desc->dev_capability_data, 16);
constexpr uint8_t ms_os_uuid[16] = {0xD8, 0xDD, 0x60, 0xDF, 0x45, 0x89, 0x4C, 0xC7,
0x9C, 0xD2, 0x65, 0x9D, 0x9E, 0x64, 0x8A, 0x9F};
if (memcmp(uuid, ms_os_uuid, 16) != 0) {
fprintf(stderr, "skipping unknown UUID\n");
continue;
}
size_t data_length = desc->bLength - sizeof(*desc) - 16;
fprintf(stderr, "found MS OS 2.0 descriptor, length = %zu\n", data_length);
// Linux does not appear to support MS OS 2.0 Descriptors.
// TODO: If and when it does, verify that we're emitting them properly.
}
}
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());
// 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
fprintf(stderr, "fetching v2 OS descriptor from device %s\n", serial->c_str());
check_ms_os_desc_v2(device_handle, *serial);
found = true;
}
if (expected_serial && !found) {
errx(1, "failed to find device with serial %s", expected_serial);
}
return 0;
}
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