f1fa035f2b
Simplify the sysfs ABI of the wusb-cbaf (Cable Based Association) driver: use one value per file and cause the write of the CHID to fetch the CDID (instead of requiring a separate read). Update the example wusb-cbaf script to work with this revised ABI. Signed-off-by: Felipe Zimmerle <felipe.zimmerle@indt.org.br> Signed-off-by: David Vrabel <david.vrabel@csr.com>
139 lines
3.6 KiB
Bash
139 lines
3.6 KiB
Bash
#! /bin/bash
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#
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set -e
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progname=$(basename $0)
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function help
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{
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cat <<EOF
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Usage: $progname COMMAND DEVICEs [ARGS]
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Command for manipulating the pairing/authentication credentials of a
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Wireless USB device that supports wired-mode Cable-Based-Association.
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Works in conjunction with the wusb-cba.ko driver from http://linuxuwb.org.
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DEVICE
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sysfs path to the device to authenticate; for example, both this
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guys are the same:
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/sys/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.4/1-4.4:1.1
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/sys/bus/usb/drivers/wusb-cbaf/1-4.4:1.1
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COMMAND/ARGS are
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start
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Start a WUSB host controller (by setting up a CHID)
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set-chid DEVICE HOST-CHID HOST-BANDGROUP HOST-NAME
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Sets host information in the device; after this you can call the
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get-cdid to see how does this device report itself to us.
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get-cdid DEVICE
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Get the device ID associated to the HOST-CHDI we sent with
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'set-chid'. We might not know about it.
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set-cc DEVICE
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If we allow the device to connect, set a random new CDID and CK
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(connection key). Device saves them for the next time it wants to
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connect wireless. We save them for that next time also so we can
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authenticate the device (when we see the CDID he uses to id
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itself) and the CK to crypto talk to it.
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CHID is always 16 hex bytes in 'XX YY ZZ...' form
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BANDGROUP is almost always 0001
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Examples:
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You can default most arguments to '' to get a sane value:
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$ $progname set-chid '' '' '' "My host name"
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A full sequence:
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$ $progname set-chid '' '' '' "My host name"
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$ $progname get-cdid ''
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$ $progname set-cc ''
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EOF
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}
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# Defaults
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# FIXME: CHID should come from a database :), band group from the host
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host_CHID="00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff"
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host_band_group="0001"
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host_name=$(hostname)
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devs="$(echo /sys/bus/usb/drivers/wusb-cbaf/[0-9]*)"
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hdevs="$(for h in /sys/class/uwb_rc/*/wusbhc; do readlink -f $h; done)"
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result=0
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case $1 in
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start)
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for dev in ${2:-$hdevs}
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do
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uwb_rc=$(readlink -f $dev/uwb_rc)
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if cat $uwb_rc/beacon | grep -q -- "-1"
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then
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echo 13 0 > $uwb_rc/beacon
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echo I: started beaconing on ch 13 on $(basename $uwb_rc) >&2
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fi
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echo $host_CHID > $dev/wusb_chid
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echo I: started host $(basename $dev) >&2
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done
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;;
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stop)
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for dev in ${2:-$hdevs}
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do
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echo 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > $dev/wusb_chid
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echo I: stopped host $(basename $dev) >&2
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uwb_rc=$(readlink -f $dev/uwb_rc)
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echo -1 | cat > $uwb_rc/beacon
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echo I: stopped beaconing on $(basename $uwb_rc) >&2
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done
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;;
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set-chid)
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shift
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for dev in ${2:-$devs}; do
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echo "${4:-$host_name}" > $dev/wusb_host_name
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echo "${3:-$host_band_group}" > $dev/wusb_host_band_groups
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echo ${2:-$host_CHID} > $dev/wusb_chid
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done
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;;
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get-cdid)
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for dev in ${2:-$devs}
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do
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cat $dev/wusb_cdid
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done
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;;
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set-cc)
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for dev in ${2:-$devs}; do
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shift
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CDID="$(head --bytes=16 /dev/urandom | od -tx1 -An)"
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CK="$(head --bytes=16 /dev/urandom | od -tx1 -An)"
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echo "$CDID" > $dev/wusb_cdid
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echo "$CK" > $dev/wusb_ck
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echo I: CC set >&2
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echo "CHID: $(cat $dev/wusb_chid)"
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echo "CDID:$CDID"
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echo "CK: $CK"
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done
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;;
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help|h|--help|-h)
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help
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;;
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*)
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echo "E: Unknown usage" 1>&2
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help 1>&2
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result=1
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esac
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exit $result
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