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bootrc: for wireless netbooting, set the WPA/WPA2 preshard key with wpapsk=password boot parameter

this allows automatic netbooting without password prompt
for the wirelss network.

--- a/sys/man/8/plan9.ini

+++ b/sys/man/8/plan9.ini

@@ -420,9 +420,6 @@

 	cat /net/ether1/ifstats

 .EE

 Ad-hoc mode or WEP encryption is currently not supported.

-To enable WPA/WPA2 encryption, see

-.IR wpa (8)

-for details.

 .TP

 .B rt2860

 Ralink Technology PCI/PCI-Express wireless adapters require

@@ -443,6 +440,14 @@

 or

 .B /boot. 

 See iwl section above for configuration details.

+.SS \fLwpapsk\fI=password\fP

+WPA/WPA2 encryption

+is detected automatically and a prompt for the

+.I password

+will appear when using the WIFI interface for netbooting.

+To avoid the prompt, the

+.I password

+can be specified with the boot parameter above.

 .SS \fLnora6=

 Disable automatic IPv6 configuration from incoming router advertisements.

 .SS DISKS, TAPES

--- a/sys/src/9/boot/net.rc

+++ b/sys/src/9/boot/net.rc

@@ -9,10 +9,23 @@

 	}

 	# setup wifi encryption if any

-	if(~ $1 ether && ~ $service terminal && test -x /bin/aux/wpa){

-		if(grep -s '^status: need authentication' $2/ifstats >[2]/dev/null){

-			aux/wpa -p $2

+	if(~ $1 ether && test -x /bin/aux/wpa){

+		essid=`{grep '^essid: ' $2/ifstats | sed 's/^essid: //; q'}

+		if(! ~ $#essid 0){

+			if(! ~ $#wpapsk 0 || grep -s '^status: need authentication' $2/ifstats >[2]/dev/null){

+				x=(aux/wpa -s $"essid)

+				if(! ~ $#wpapsk 0){

+					echo 'key proto=wpapsk' `{!password=$"wpapsk whatis essid !password} > /mnt/factotum/ctl

+					wpapsk=()

+				}

+				if not {

+					x=($x -p)		

+				}

+				$x $2

+			}

+			essid=()

 		}

+		rm -f /env/^(essid wpapsk)

 	}

 	if(~ $1 ether gbe && ~ $#* 2) @{