github.com/transparency-dev/armored-witness-os@v0.1.3-0.20240514084412-27eef7325168/cmd/witnessctl/usb.go (about)

     1  // Copyright 2022 The Armored Witness OS authors. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build !tamago
    16  // +build !tamago
    17  
    18  package main
    19  
    20  import (
    21  	"fmt"
    22  
    23  	flynn_hid "github.com/flynn/hid"
    24  	"github.com/flynn/u2f/u2fhid"
    25  
    26  	"github.com/transparency-dev/armored-witness-os/api"
    27  )
    28  
    29  // detect looks for connected witness devices
    30  func detect() ([]Device, error) {
    31  	devices, err := flynn_hid.Devices()
    32  	if err != nil {
    33  		return nil, err
    34  	}
    35  
    36  	devs := []Device{}
    37  	for _, d := range devices {
    38  		if d.UsagePage == api.HIDUsagePage &&
    39  			d.VendorID == api.VendorID &&
    40  			d.ProductID == api.ProductID {
    41  
    42  			dev, err := u2fhid.Open(d)
    43  			if err != nil {
    44  				return nil, fmt.Errorf("u2fhid.Open(%q): %v", d.Path, err)
    45  			}
    46  
    47  			devs = append(devs, Device{usb: d, u2f: dev})
    48  		}
    49  	}
    50  
    51  	return devs, nil
    52  }