linux/Documentation/usb/wusb-cbaf
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   1#! /bin/bash
   2#
   3
   4set -e
   5
   6progname=$(basename $0)
   7function help
   8{
   9    cat <<EOF
  10Usage: $progname COMMAND DEVICEs [ARGS]
  11
  12Command for manipulating the pairing/authentication credentials of a
  13Wireless USB device that supports wired-mode Cable-Based-Association.
  14
  15Works in conjunction with the wusb-cba.ko driver from http://linuxuwb.org.
  16
  17
  18DEVICE
  19
  20 sysfs path to the device to authenticate; for example, both this
  21 guys are the same:
  22
  23 /sys/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.4/1-4.4:1.1
  24 /sys/bus/usb/drivers/wusb-cbaf/1-4.4:1.1
  25
  26COMMAND/ARGS are
  27
  28 start
  29
  30   Start a WUSB host controller (by setting up a CHID)
  31
  32 set-chid DEVICE HOST-CHID HOST-BANDGROUP HOST-NAME
  33
  34   Sets host information in the device; after this you can call the
  35   get-cdid to see how does this device report itself to us.
  36
  37 get-cdid DEVICE
  38
  39   Get the device ID associated to the HOST-CHID we sent with
  40   'set-chid'. We might not know about it.
  41
  42 set-cc DEVICE
  43
  44   If we allow the device to connect, set a random new CDID and CK
  45   (connection key). Device saves them for the next time it wants to
  46   connect wireless. We save them for that next time also so we can
  47   authenticate the device (when we see the CDID he uses to id
  48   itself) and the CK to crypto talk to it.
  49
  50CHID is always 16 hex bytes in 'XX YY ZZ...' form
  51BANDGROUP is almost always 0001
  52
  53Examples:
  54
  55  You can default most arguments to '' to get a sane value:
  56
  57  $ $progname set-chid '' '' '' "My host name"
  58
  59  A full sequence:
  60
  61  $ $progname set-chid '' '' '' "My host name"
  62  $ $progname get-cdid ''
  63  $ $progname set-cc ''
  64
  65EOF
  66}
  67
  68
  69# Defaults
  70# FIXME: CHID should come from a database :), band group from the host
  71host_CHID="00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff"
  72host_band_group="0001"
  73host_name=$(hostname)
  74
  75devs="$(echo /sys/bus/usb/drivers/wusb-cbaf/[0-9]*)"
  76hdevs="$(for h in /sys/class/uwb_rc/*/wusbhc; do readlink -f $h; done)"
  77
  78result=0
  79case $1 in
  80    start)
  81        for dev in ${2:-$hdevs}
  82          do
  83          echo $host_CHID > $dev/wusb_chid
  84          echo I: started host $(basename $dev) >&2
  85        done
  86        ;;
  87    stop)
  88        for dev in ${2:-$hdevs}
  89          do
  90          echo 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > $dev/wusb_chid
  91          echo I: stopped host $(basename $dev) >&2
  92        done
  93        ;;
  94    set-chid)
  95        shift
  96        for dev in ${2:-$devs}; do
  97            echo "${4:-$host_name}" > $dev/wusb_host_name
  98            echo "${3:-$host_band_group}" > $dev/wusb_host_band_groups
  99            echo ${2:-$host_CHID} > $dev/wusb_chid
 100        done
 101        ;;
 102    get-cdid)
 103        for dev in ${2:-$devs}
 104          do
 105          cat $dev/wusb_cdid
 106        done
 107        ;;
 108    set-cc)
 109        for dev in ${2:-$devs}; do
 110            shift
 111            CDID="$(head --bytes=16 /dev/urandom  | od -tx1 -An)"
 112            CK="$(head --bytes=16 /dev/urandom  | od -tx1 -An)"
 113            echo "$CDID" > $dev/wusb_cdid
 114            echo "$CK" > $dev/wusb_ck
 115
 116            echo I: CC set >&2
 117            echo "CHID: $(cat $dev/wusb_chid)"
 118            echo "CDID:$CDID"
 119            echo "CK:  $CK"
 120        done
 121        ;;
 122    help|h|--help|-h)
 123        help
 124        ;;
 125    *)
 126        echo "E: Unknown usage" 1>&2
 127        help 1>&2
 128        result=1
 129esac
 130exit $result
 131
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