AUTHOR: Eloi Primaux eloi@bliscat.org
DATE: 2006-02-19
LICENSE: GNU Free Documentation License Version 2
SYNOPSIS: Setting a wireless network with WPA and dhcpcd
DESCRIPTION:
This hint purpose a way to set wireless networks using wpa_supplicant and dhcpcd
ATTACHMENTS:
no attachments yet
PREREQUISITES:
A full LFS-6.1 and BLFS-6.1 system already configured with a standart lan network
The chipset driver of your wireless card (ex: madwifi http://madwifi.org/wiki/)
wireless tools available at http://www.hpl.hp.com/personal/Jean_Tourrilhes/Linux/Tools.html
wpa_supplicant available at http://hostap.epitest.fi/wpa_supplicant/ (latest stable release)
dhcpcd installed from the blfs book
note you will also require and access point which use wpa encryption and dhcp service
HINT:
this hint is mainly based on what has already been done in the blfs book for the dhcpcd service
install chipset driver, wireless tools, and wpa_supplicant
both of them have fully explanaited documentations to build them
If you still in trouble, have a look to http://madwifi.org/wiki
Now you need to create 2 files,
1) /etc/sysconfig/network-devices/service/wpa-dhcpcd
2) /etc/sysconfig/network-devices/ifconfig.XX/wpa-dhcpcd
XX is the name of your device, eth0,wlan0,ath0...
Here are those files
####### 1) wpa-dhcpcd service script ########
#
# /etc/sysconfig/network-devices/service/wpa-dhcpcd
#
####### start here ######
#!/bin/sh
# Begin $network-devices/services/wpa-dhcpcd
# Based on dhcpcd script adapted for wpa networks
# Rewritten by Eloi Primaux - eloi@bliscat.org
. /etc/sysconfig/rc
. $rc_functions
. $IFCONFIG
DHCPCD_PIDFILE="/var/run/dhcpcd-$1.pid"
DHCPCD_LEASEINFO="/var/lib/dhcpc/dhcpcd-$1.info"
WPA_PIDFILE="/var/run/wpa_supplicant-$1.pid"
#WPA_CONFIGFILE="/etc/sysconfig/network-devices/ifconfig.$1/wpa-dhcpcd"
#. $WPA_CONFIGFILE
WPA_SCRP="/etc/sysconfig/network-devices/wpa-script.$1"
rm -f $WPA_SCRP
case "$2" in
up)
RET=$?
evaluate_retval
echo "" # due to the pre ifconfig process
# Start wpa_supplicant in the background
wpa_supplicant -g/var/run/wpa_supplicant-$1-global -P$WPA_PIDFILE -B
#We must check if our requested SSID is available...
boot_mesg "Scanning for available Access Points..."
iwlist ath0 scan | grep "ESSID"
SSID_AVAILABLE=$(iwlist ath0 scan | grep "$WPA_SSID")
if [ -n "$SSID_AVAILABLE" ]; then
boot_mesg "The Access Point "$WPA_SSID" is available, connecting"
echo_ok
# Add a new interface (no configuration file and
# enable control interface)
echo "wpa_cli -g/var/run/wpa_supplicant-$1-global interface_add $1 \"\" $WPA_DRIVER /var/run/wpa_supplicant" > $WPA_SCRP
# Configure a network using the newly added network interface:
echo "wpa_cli -i$1 add_network" >> $WPA_SCRP
echo "wpa_cli -i$1 set_network 0 ssid '\"$WPA_SSID\"'" >> $WPA_SCRP
echo "wpa_cli -i$1 set_network 0 key_mgmt WPA-PSK" >> $WPA_SCRP
echo "wpa_cli -i$1 set_network 0 psk '\"$WPA_PASS\"'" >> $WPA_SCRP
echo "wpa_cli -i$1 set_network 0 pairwise $WPA_PAIRWISE" >> $WPA_SCRP
echo "wpa_cli -i$1 set_network 0 group $WPA_GROUP" >> $WPA_SCRP
echo "wpa_cli -i$1 set_network 0 proto $WPA_PROTO" >> $WPA_SCRP
echo "wpa_cli -i$1 enable_network 0" >> $WPA_SCRP
#Now we run the little script created above
boot_mesg -n "Booting wpa_supplicant on the $1 interface..."
. $WPA_SCRP > /dev/null
RET=$?
evaluate_retval
#Now we overwrite the last script by one which request the wpa status
# When the network is ready it will answer "wpa_state=COMPLETED"
echo "wpa_cli -i$1 status | grep 'wpa_state' | sed 's,wpa_state=,,g'" > $WPA_SCRP
# we run a little loop to wait for wpa_supplicant being ready
boot_mesg "Please wait while the daemon is connecting to $WPA_SSID..."
RET=$(. $WPA_SCRP)
COUNTER=0 # to not loop undefinetly at boot time if the network is down...
while [ "$RET" != "COMPLETED" ]; do
if [ "$COUTER" = "$WPA_MAXCYCLE" ]; then
boot_mesg "The Access Point $WPA_SSID is available" ${WARNING}
boot_mesg "But the connecting time is over . This is" ${WARNING}
boot_mesg "Mostly due to a misconfigurated network." ${WARNING}
boot_mesg "Please check your configuration" ${WARNING}
echo_warning
exit 2
fi
sleep 5s
RET=$(. $WPA_SCRP)
echo -n "$RET..."
done
echo ""
echo_ok
# At this point, the new network interface should start trying to associate
# with the WPA-PSK network using SSID.
boot_mesg "Starting dhcpcd on the $1 interface..."
# Test to see if there is a stale pid file
if [ -f "$DHCPCD_PIDFILE" ]
then
ps `cat "$DHCPCD_PIDFILE"` | grep dhcpcd > /dev/null
if [ $? != 0 ]
then
rm -f $DHCPCD_PIDFILE > /dev/null
else
boot_mesg "dhcpcd already running!" ${WARNING}
echo_warning
exit 2
fi
fi
/sbin/dhcpcd $1 $DHCP_START
# Save the return value
RET="$?"
# Print the assigned settings if requested
if [ "$RET" = "0" -a "$PRINTIP" = "yes" ]; then
. /var/lib/dhcpc/dhcpcd-$1.info
if [ "$PRINTALL" = "yes" ]; then
echo ""
echo_ok
boot_mesg " DHCP Assigned Settings for $1:"
boot_mesg_flush
boot_mesg " IP Address: $IPADDR"
boot_mesg_flush
boot_mesg " Subnet Mask: $NETMASK"
boot_mesg_flush
boot_mesg " Default Gateway: $GATEWAY"
boot_mesg_flush
boot_mesg " DNS Server: $DNS"
boot_mesg_flush
else
boot_mesg " IP Addresss: ""$IPADDR"
echo_ok
fi
else
echo ""
$(exit "$RET")
evaluate_retval
fi
else
boot_mesg "The Access Point "$WPA_SSID" is not available" ${WARNING}
boot_mesg "Please check your configuration" ${WARNING}
echo_warning
exit 2
fi
;;
down)
boot_mesg -n "Stopping dhcpcd on the $1 interface..."
# Do nothing with the client daemon if we have an infinate
# lease time as the client exits when started in this case,
# just echo OK.
if [ -e $DHCPCD_LEASEINFO ]
then
. $DHCPCD_LEASEINFO
if [ "$DHCPCD_LEASETIME" = "4294967295" ]
then
# do nothing, just echo ok
echo ""
echo_ok
else
if [ -n "$DHCP_STOP" ]
then
/sbin/dhcpcd $1 $DHCP_STOP &> /dev/null
RET="$?"
if [ "$RET" -eq 0 ]; then
echo ""
echo_ok
elif [ "$RET" -eq 1 ]; then
boot_mesg "dhcpcd not running!" ${WARNING}
echo_warning
else
echo ""
echo_failure
fi
else
echo ""
killproc dhcpcd
fi
fi
else
boot_mesg -n "LEASEINFO Test failed! - " ${WARNING}
boot_mesg "dhcpcd is not running!" ${WARNING}
echo_warning
exit 1
fi
boot_mesg "Stopping wpa_supplicant on the $1 interface..."
killproc -p $WPA_PIDFILE wpa_supplicant
;;
*)
echo "Usage: $0 [interface] {up|down}"
exit 1
;;
esac
# End $network_devices/services/wpa-dhcpcd
#### end here####
####### 2) wpa-dhcpcd config file ########
#
# /etc/sysconfig/network-devices/ifconfig.XX/wpa-dhcpcd
# XX is the name of your device, eth0,wlan0,ath0...
#
#### start here #####
#This config file is mostly based of the
#dhcpcd config file
ONBOOT="yes"
SERVICE="wpa-dhcpcd"
DHCP_START="-d " # to print some debug informations
DHCP_STOP="-k "
WPA_SSID="Your SSID"
WPA_DRIVER="Your Driver"
WPA_PROTO="Your Proto" # WPA2 for WPA2-PSK check the wpa-supplicant readme
WPA_PAIRWISE="Your Pairwise" # CCMP for AES
WPA_GROUP="Your Group" # CCMP for AES
WPA_PASS="Your very secret WPA password"
#one cycle each 5 seconds
WPA_MAXCYCLE=24 # 120s
# Set PRINTIP="yes" to have the script print
# the DHCP assigned IP address
PRINTIP="no"
# Set PRINTALL="yes" to print the DHCP assigned values for
# IP, SM, DG, and 1st NS. This requires PRINTIP="yes".
PRINTALL="yes"
### End Here #####
do a chmod 755 /etc/sysconfig/network-devices/service/wpa-dhcpcd
and if you correctly set the config file, just type
/etc/rc.d/init.d/network restart if you can use the connection then
your wireless network will be set at boot time
ACKNOWLEDGEMENTS:
CHANGELOG:
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