create_ap

create a nat-ed wifi ap
git clone git://git.2f30.org/create_ap.git
Log | Files | Refs | LICENSE

commit 29d609cf24d58d58ffdc5bc6b298ea2449740879
parent 5abc21fb7e0297909021815371b838e79367690a
Author: oblique <psyberbits@gmail.com>
Date:   Tue Dec 17 21:48:59 +0200

Add --no-virt option

Fixes #10

Diffstat:
create_ap | 85++++++++++++++++++++++++++++++++++++++++++++++++++-----------------------------
1 file changed, 54 insertions(+), 31 deletions(-)
diff --git a/create_ap b/create_ap @@ -31,13 +31,15 @@ usage() { echo " 'none' for no Internet sharing (equivalent to -n)" echo " --hidden Make the Access Point hidden (do not broadcast the SSID)" echo " --driver Choose your WiFi adapter driver (default: nl80211)" + echo " --no-virt Do not create virtual interface" echo echo "Non-Bridging Options:" echo " -g <gateway> IPv4 Gateway for the Access Point (default: 192.168.12.1)" echo " -d DNS server will take into account /etc/hosts" echo echo "Useful informations:" - echo " * You can create an AP with the same interface you are getting your Internet connection." + echo " * If you're not using the --no-virt option, then you can create an AP with the same" + echo " interface you are getting your Internet connection." echo " * You can pass your SSID and password through pipe or through arguments (see examples)." echo echo "Examples:" @@ -125,8 +127,10 @@ ETC_HOSTS=0 HIDDEN=0 SHARE_METHOD=nat DRIVER=nl80211 +NO_VIRT=0 CONFDIR= +WIFI_IFACE= VWIFI_IFACE= INTERNET_IFACE= BRIDGE_IFACE= @@ -149,7 +153,7 @@ cleanup() { if [[ "$SHARE_METHOD" != "none" ]]; then if [[ "$SHARE_METHOD" == "nat" ]]; then iptables -t nat -D POSTROUTING -o ${INTERNET_IFACE} -j MASQUERADE - iptables -D FORWARD -i ${VWIFI_IFACE} -s ${GATEWAY%.*}.0/24 -j ACCEPT + iptables -D FORWARD -i ${WIFI_IFACE} -s ${GATEWAY%.*}.0/24 -j ACCEPT iptables -D FORWARD -i ${INTERNET_IFACE} -d ${GATEWAY%.*}.0/24 -j ACCEPT [[ -n $OLD_IP_FORWARD ]] && echo $OLD_IP_FORWARD > /proc/sys/net/ipv4/ip_forward elif [[ "$SHARE_METHOD" == "bridge" ]]; then @@ -165,10 +169,18 @@ cleanup() { iptables -D INPUT -p udp -m udp --dport 67 -j ACCEPT fi - ip link set down dev ${VWIFI_IFACE} - ip addr flush ${VWIFI_IFACE} - networkmanager_rm_unmanaged ${VWIFI_IFACE} ${OLD_MACADDR} - iw dev ${VWIFI_IFACE} del + if [[ $NO_VIRT -eq 0 ]]; then + if [[ -n $VWIFI_IFACE ]]; then + ip link set down dev ${VWIFI_IFACE} + ip addr flush ${VWIFI_IFACE} + networkmanager_rm_unmanaged ${VWIFI_IFACE} ${OLD_MACADDR} + iw dev ${VWIFI_IFACE} del + fi + else + ip link set down dev ${WIFI_IFACE} + ip addr flush ${WIFI_IFACE} + networkmanager_rm_unmanaged ${WIFI_IFACE} + fi } die() { @@ -180,7 +192,7 @@ die() { # if the user press ctrl+c then execute die() trap "die" SIGINT -ARGS=$(getopt -o hc:w:g:dnm: -l "help","hidden","driver:" -n $(basename $0) -- "$@") +ARGS=$(getopt -o hc:w:g:dnm: -l "help","hidden","driver:","no-virt" -n $(basename $0) -- "$@") [[ $? -ne 0 ]] && exit 1 eval set -- "$ARGS" @@ -227,6 +239,10 @@ while :; do DRIVER="$1" shift ;; + --no-virt) + shift + NO_VIRT=1 + ;; --) shift break @@ -252,13 +268,6 @@ if [[ "$SHARE_METHOD" != "nat" && "$SHARE_METHOD" != "bridge" && "$SHARE_METHOD" fi WIFI_IFACE=$1 -VWIFI_IFACE=${WIFI_IFACE}ap -WIFI_IFACE_CHANNEL=$(iw ${WIFI_IFACE} info | grep channel | awk '{print $2}') - -if [[ -n $WIFI_IFACE_CHANNEL && $WIFI_IFACE_CHANNEL -ne $CHANNEL ]]; then - echo "hostapd will fail to use channel $CHANNEL because $WIFI_IFACE is already set to channel $WIFI_IFACE_CHANNEL, fallback to channel $WIFI_IFACE_CHANNEL." - CHANNEL=$WIFI_IFACE_CHANNEL -fi if [[ "$SHARE_METHOD" == "bridge" ]]; then OLD_BRIDGE_IPTABLES=$(cat /proc/sys/net/bridge/bridge-nf-call-iptables) @@ -324,24 +333,36 @@ fi CONFDIR=$(mktemp -d /tmp/create_ap.${WIFI_IFACE}.conf.XXXXXXXX) echo "Config dir: $CONFDIR" -echo -n "Creating a virtual WiFi interface... " -iw dev ${VWIFI_IFACE} del > /dev/null 2>&1 -if iw dev ${WIFI_IFACE} interface add ${VWIFI_IFACE} type __ap; then - echo "${VWIFI_IFACE} created." -else - die "Failed to create a virtual WiFi interface from ${WIFI_IFACE}." +if [[ $NO_VIRT -eq 0 ]]; then + VWIFI_IFACE=${WIFI_IFACE}ap + WIFI_IFACE_CHANNEL=$(iw ${WIFI_IFACE} info | grep channel | awk '{print $2}') + + if [[ -n $WIFI_IFACE_CHANNEL && $WIFI_IFACE_CHANNEL -ne $CHANNEL ]]; then + echo "hostapd will fail to use channel $CHANNEL because $WIFI_IFACE is already set to channel $WIFI_IFACE_CHANNEL, fallback to channel $WIFI_IFACE_CHANNEL." + CHANNEL=$WIFI_IFACE_CHANNEL + fi + + echo -n "Creating a virtual WiFi interface... " + iw dev ${VWIFI_IFACE} del > /dev/null 2>&1 + if iw dev ${WIFI_IFACE} interface add ${VWIFI_IFACE} type __ap; then + echo "${VWIFI_IFACE} created." + else + VWIFI_IFACE= + die "Failed to create a virtual WiFi interface from ${WIFI_IFACE}." + fi + OLD_MACADDR=$(get_macaddr ${VWIFI_IFACE}) + NEW_MACADDR=$(get_new_macaddr ${VWIFI_IFACE}) + WIFI_IFACE=${VWIFI_IFACE} fi -OLD_MACADDR=$(get_macaddr ${VWIFI_IFACE}) -NEW_MACADDR=$(get_new_macaddr ${VWIFI_IFACE}) -networkmanager_add_unmanaged ${VWIFI_IFACE} +networkmanager_add_unmanaged ${WIFI_IFACE} [[ $HIDDEN -eq 1 ]] && echo "Access Point's SSID is hidden!" # hostapd config cat << EOF > $CONFDIR/hostapd.conf ssid=${SSID} -interface=${VWIFI_IFACE} +interface=${WIFI_IFACE} driver=${DRIVER} hw_mode=g channel=${CHANNEL} @@ -367,7 +388,7 @@ if [[ "$SHARE_METHOD" == "bridge" ]]; then else # dnsmasq config (dhcp + dns) cat << EOF > $CONFDIR/dnsmasq.conf -interface=${VWIFI_IFACE} +interface=${WIFI_IFACE} bind-interfaces dhcp-range=${GATEWAY%.*}.1,${GATEWAY%.*}.254,255.255.255.0,24h dhcp-option=option:router,${GATEWAY} @@ -376,12 +397,14 @@ EOF fi # initialize WiFi interface -ip link set dev ${VWIFI_IFACE} address ${NEW_MACADDR} || die -ip link set down dev ${VWIFI_IFACE} || die -ip addr flush ${VWIFI_IFACE} || die +if [[ $NO_VIRT -eq 0 ]]; then + ip link set dev ${WIFI_IFACE} address ${NEW_MACADDR} || die +fi +ip link set down dev ${WIFI_IFACE} || die +ip addr flush ${WIFI_IFACE} || die if [[ "$SHARE_METHOD" != "bridge" ]]; then - ip link set up dev ${VWIFI_IFACE} || die - ip addr add ${GATEWAY}/24 broadcast ${GATEWAY%.*}.255 dev ${VWIFI_IFACE} || die + ip link set up dev ${WIFI_IFACE} || die + ip addr add ${GATEWAY}/24 broadcast ${GATEWAY%.*}.255 dev ${WIFI_IFACE} || die fi # enable Internet sharing @@ -389,7 +412,7 @@ if [[ "$SHARE_METHOD" != "none" ]]; then echo "Sharing Internet using method: $SHARE_METHOD" if [[ "$SHARE_METHOD" == "nat" ]]; then iptables -t nat -I POSTROUTING -o ${INTERNET_IFACE} -j MASQUERADE || die - iptables -I FORWARD -i ${VWIFI_IFACE} -s ${GATEWAY%.*}.0/24 -j ACCEPT || die + iptables -I FORWARD -i ${WIFI_IFACE} -s ${GATEWAY%.*}.0/24 -j ACCEPT || die iptables -I FORWARD -i ${INTERNET_IFACE} -d ${GATEWAY%.*}.0/24 -j ACCEPT || die echo 1 > /proc/sys/net/ipv4/ip_forward || die elif [[ "$SHARE_METHOD" == "bridge" ]]; then