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