diff --git a/adb/tools/check_ms_os_desc.cpp b/adb/tools/check_ms_os_desc.cpp index d4cfb6183..8743ff725 100644 --- a/adb/tools/check_ms_os_desc.cpp +++ b/adb/tools/check_ms_os_desc.cpp @@ -158,6 +158,49 @@ static void check_ms_os_desc_v1(libusb_device_handle* device_handle, const std:: 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) { @@ -208,8 +251,10 @@ int main(int argc, char** argv) { 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: + // 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; }