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trezor-firmware/legacy/webusb.c

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/*
* Copyright (c) 2016, Devan Lai
*
* Permission to use, copy, modify, and/or distribute this software
* for any purpose with or without fee is hereby granted, provided
* that the above copyright notice and this permission notice
* appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <string.h>
#include "random_delays.h"
#include "usb21_standard.h"
#include "util.h"
#include "webusb.h"
const struct webusb_platform_descriptor
webusb_platform_capability_descriptor_landing = {
.bLength = WEBUSB_PLATFORM_DESCRIPTOR_SIZE,
.bDescriptorType = USB_DT_DEVICE_CAPABILITY,
.bDevCapabilityType = USB_DC_PLATFORM,
.bReserved = 0,
.platformCapabilityUUID = WEBUSB_UUID,
.bcdVersion = 0x0100,
.bVendorCode = WEBUSB_VENDOR_CODE,
.iLandingPage = 1};
const struct webusb_platform_descriptor
webusb_platform_capability_descriptor_no_landing = {
.bLength = WEBUSB_PLATFORM_DESCRIPTOR_SIZE,
.bDescriptorType = USB_DT_DEVICE_CAPABILITY,
.bDevCapabilityType = USB_DC_PLATFORM,
.bReserved = 0,
.platformCapabilityUUID = WEBUSB_UUID,
.bcdVersion = 0x0100,
.bVendorCode = WEBUSB_VENDOR_CODE,
.iLandingPage = 0};
static const char* webusb_https_url;
static enum usbd_request_return_codes webusb_control_vendor_request(
usbd_device* usbd_dev, struct usb_setup_data* req, uint8_t** buf,
uint16_t* len, usbd_control_complete_callback* complete) {
(void)complete;
(void)usbd_dev;
wait_random();
if (req->bRequest != WEBUSB_VENDOR_CODE) {
return USBD_REQ_NEXT_CALLBACK;
}
int status = USBD_REQ_NOTSUPP;
switch (req->wIndex) {
case WEBUSB_REQ_GET_URL: {
struct webusb_url_descriptor* url = (struct webusb_url_descriptor*)(*buf);
uint16_t index = req->wValue;
if (index == 0) {
return USBD_REQ_NOTSUPP;
}
if (index == 1) {
size_t url_len = strlen(webusb_https_url);
url->bLength = WEBUSB_DT_URL_DESCRIPTOR_SIZE + url_len;
url->bDescriptorType = WEBUSB_DT_URL;
url->bScheme = WEBUSB_URL_SCHEME_HTTPS;
memcpy(&url->URL, webusb_https_url, url_len);
*len = MIN_8bits(*len, url->bLength);
status = USBD_REQ_HANDLED;
} else {
// TODO: stall instead?
status = USBD_REQ_NOTSUPP;
}
break;
}
default: {
status = USBD_REQ_NOTSUPP;
break;
}
}
return status;
}
static void webusb_set_config(usbd_device* usbd_dev, uint16_t wValue) {
(void)wValue;
usbd_register_control_callback(usbd_dev,
USB_REQ_TYPE_VENDOR | USB_REQ_TYPE_DEVICE,
USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
webusb_control_vendor_request);
}
void webusb_setup(usbd_device* usbd_dev, const char* https_url) {
webusb_https_url = https_url;
usbd_register_set_config_callback(usbd_dev, webusb_set_config);
}