create_ap

create a nat-ed wifi ap
git clone git://git.2f30.org/create_ap.git
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commit f831ad98d6496d5ab037055de0d11dd5e5413544
parent 309e8e353bae912f3b1872000ce9c3159babf027
Author: oblique <psyberbits@gmail.com>
Date:   Sun Nov  2 01:07:06 +0200

Add support for 5GHz frequency band

Close #52

Diffstat:
create_ap | 59+++++++++++++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 51 insertions(+), 8 deletions(-)
diff --git a/create_ap b/create_ap @@ -38,6 +38,7 @@ usage() { echo " --ieee80211n Enable IEEE 802.11n (HT)" echo " --ht_capab <HT> HT capabilities (default: [HT40+])" echo " --country <code> Set two-letter country code for regularity (example: US)" + echo " --freq-band <GHz> Set frequency band. Valid inputs: 2.4, 5 (default: 2.4)" echo " --driver Choose your WiFi adapter driver (default: nl80211)" echo " --no-virt Do not create virtual interface" echo " --fix-unmanaged If NetworkManager shows your interface as unmanaged after you" @@ -150,17 +151,21 @@ can_be_ap() { can_transmit_to_channel() { IFACE=$1 - CHANNEL=$2 + CHANNEL_NUM=$2 if [[ $USE_IWCONFIG -eq 0 ]]; then - CHANNEL_INFO=$(get_adapter_info ${IFACE} | grep "MHz \[${CHANNEL}\]") + if [[ $FREQ_BAND == 2.4 ]]; then + CHANNEL_INFO=$(get_adapter_info ${IFACE} | grep " 24[0-9][0-9] MHz \[${CHANNEL_NUM}\]") + else + CHANNEL_INFO=$(get_adapter_info ${IFACE} | grep " \(49[0-9][0-9]\|5[0-9]\{3\}\) MHz \[${CHANNEL_NUM}\]") + fi [[ -z "${CHANNEL_INFO}" ]] && return 1 [[ "${CHANNEL_INFO}" == *no\ IR* ]] && return 1 [[ "${CHANNEL_INFO}" == *disabled* ]] && return 1 return 0 else - CHANNEL=$(printf '%02d' ${CHANNEL}) - CHANNEL_INFO=$(iwlist ${IFACE} channel | grep "Channel ${CHANNEL} :") + CHANNEL_NUM=$(printf '%02d' ${CHANNEL_NUM}) + CHANNEL_INFO=$(iwlist ${IFACE} channel | grep "Channel ${CHANNEL_NUM} :") [[ -z "${CHANNEL_INFO}" ]] && return 1 return 0 fi @@ -184,6 +189,10 @@ ieee80211_frequency_to_channel() { fi } +is_5ghz_frequency() { + [[ $1 =~ ^(49[0-9]{2})|(5[0-9]{3})$ ]] +} + is_wifi_connected() { if [[ $USE_IWCONFIG -eq 0 ]]; then iw dev "$1" link 2>&1 | grep -E '^Connected to' > /dev/null 2>&1 && return 0 @@ -372,7 +381,7 @@ networkmanager_wait_until_unmanaged() { } -CHANNEL=1 +CHANNEL=default GATEWAY=192.168.12.1 WPA_VERSION=1+2 ETC_HOSTS=0 @@ -384,6 +393,7 @@ DRIVER=nl80211 NO_VIRT=0 FIX_UNMANAGED=0 COUNTRY= +FREQ_BAND=2.4 CONFDIR= WIFI_IFACE= @@ -487,7 +497,7 @@ clean_exit() { # if the user press ctrl+c then execute die() trap "die" SIGINT -ARGS=$(getopt -o hc:w:g:dnm: -l "help","hidden","ieee80211n","ht_capab:","driver:","no-virt","fix-unmanaged","country:" -n $(basename $0) -- "$@") +ARGS=$(getopt -o hc:w:g:dnm: -l "help","hidden","ieee80211n","ht_capab:","driver:","no-virt","fix-unmanaged","country:","freq-band:" -n $(basename $0) -- "$@") [[ $? -ne 0 ]] && exit 1 eval set -- "$ARGS" @@ -556,6 +566,11 @@ while :; do COUNTRY="$1" shift ;; + --freq-band) + shift + FREQ_BAND="$1" + shift + ;; --) shift break @@ -578,6 +593,24 @@ if [[ $FIX_UNMANAGED -eq 1 ]]; then exit 0 fi +if [[ $FREQ_BAND != 2.4 && $FREQ_BAND != 5 ]]; then + echo "ERROR: Invalid frequency band" >&2 + exit 1 +fi + +if [[ $CHANNEL == default ]]; then + if [[ $FREQ_BAND == 2.4 ]]; then + CHANNEL=1 + else + CHANNEL=36 + fi +fi + +if [[ $FREQ_BAND != 5 && $CHANNEL -gt 14 ]]; then + echo "Channel number is greater than 14, assuming 5GHz frequency band" + FREQ_BAND=5 +fi + WIFI_IFACE=$1 if ! is_wifi_interface ${WIFI_IFACE}; then @@ -721,6 +754,11 @@ if [[ $NO_VIRT -eq 0 ]]; then WIFI_IFACE_FREQ=$(iw dev ${WIFI_IFACE} link | grep -i freq | awk '{print $2}') WIFI_IFACE_CHANNEL=$(ieee80211_frequency_to_channel ${WIFI_IFACE_FREQ}) echo -n "${WIFI_IFACE} is already associated with channel ${WIFI_IFACE_CHANNEL} (${WIFI_IFACE_FREQ} MHz)" + if is_5ghz_frequency $WIFI_IFACE_FREQ; then + FREQ_BAND=5 + else + FREQ_BAND=2.4 + fi if [[ $WIFI_IFACE_CHANNEL -ne $CHANNEL ]]; then echo ", fallback to channel ${WIFI_IFACE_CHANNEL}" CHANNEL=$WIFI_IFACE_CHANNEL @@ -748,7 +786,7 @@ if [[ $NO_VIRT -eq 0 ]]; then WIFI_IFACE=${VWIFI_IFACE} fi -can_transmit_to_channel ${WIFI_IFACE} ${CHANNEL} || die "Your adapter can not transmit to channel ${CHANNEL}." +can_transmit_to_channel ${WIFI_IFACE} ${CHANNEL} || die "Your adapter can not transmit to channel ${CHANNEL}, frequency band ${FREQ_BAND}GHz." if networkmanager_is_running && ! networkmanager_iface_is_unmanaged ${WIFI_IFACE}; then echo -n "Network Manager found, set ${WIFI_IFACE} as unmanaged device... " @@ -764,7 +802,6 @@ cat << EOF > $CONFDIR/hostapd.conf ssid=${SSID} interface=${WIFI_IFACE} driver=${DRIVER} -hw_mode=g channel=${CHANNEL} ctrl_interface=$CONFDIR/hostapd_ctrl ctrl_interface_group=0 @@ -776,6 +813,12 @@ if [[ -n $COUNTRY ]]; then echo "country_code=${COUNTRY}" >> $CONFDIR/hostapd.conf fi +if [[ $FREQ_BAND == 2.4 ]]; then + echo "hw_mode=g" >> $CONFDIR/hostapd.conf +else + echo "hw_mode=a" >> $CONFDIR/hostapd.conf +fi + if [[ $IEEE80211N -eq 1 ]]; then cat << EOF >> $CONFDIR/hostapd.conf ieee80211n=1