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