528 lines
16 KiB
Bash
Executable File
528 lines
16 KiB
Bash
Executable File
#!/bin/bash
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# general dependencies:
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# bash (to run this script)
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# util-linux (for getopt)
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# hostapd
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# iproute2
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# iw
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# haveged (optional)
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# dependencies for 'nat' or 'none' Internet sharing method
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# dnsmasq
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# iptables
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# dependencies for 'bridge' Internet sharing method
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# bridge-utils
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usage() {
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echo "Usage: $(basename $0) [options] <wifi-interface> [<interface-with-internet>] [<access-point-name> [<passphrase>]]"
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echo
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echo "Options:"
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echo " -h, --help Show this help"
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echo " -c <channel> Channel number (default: 1)"
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echo " -w <WPA version> Use 1 for WPA, use 2 for WPA2, use 1+2 for both (default: 1+2)"
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echo " -n Disable Internet sharing (if you use this, don't pass"
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echo " the <interface-with-internet> argument)"
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echo " -m <method> Method for Internet sharing."
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echo " Use: 'nat' for NAT (default)"
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echo " 'bridge' for bridging"
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echo " 'none' for no Internet sharing (equivalent to -n)"
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echo " --hidden Make the Access Point hidden (do not broadcast the SSID)"
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echo " --ieee80211n Enable IEEE 802.11n (HT)"
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echo " --ht_capab <HT> HT capabilities (default: [HT40+])"
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echo " --driver Choose your WiFi adapter driver (default: nl80211)"
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echo " --no-virt Do not create virtual interface"
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echo
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echo "Non-Bridging Options:"
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echo " -g <gateway> IPv4 Gateway for the Access Point (default: 192.168.12.1)"
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echo " -d DNS server will take into account /etc/hosts"
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echo
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echo "Useful informations:"
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echo " * If you're not using the --no-virt option, then you can create an AP with the same"
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echo " interface you are getting your Internet connection."
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echo " * You can pass your SSID and password through pipe or through arguments (see examples)."
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echo
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echo "Examples:"
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echo " $(basename $0) wlan0 eth0 MyAccessPoint MyPassPhrase"
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echo " echo -e 'MyAccessPoint\nMyPassPhrase' | $(basename $0) wlan0 eth0"
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echo " $(basename $0) wlan0 eth0 MyAccessPoint"
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echo " echo 'MyAccessPoint' | $(basename $0) wlan0 eth0"
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echo " $(basename $0) wlan0 wlan0 MyAccessPoint MyPassPhrase"
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echo " $(basename $0) -n wlan0 MyAccessPoint MyPassPhrase"
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echo " $(basename $0) -m bridge wlan0 eth0 MyAccessPoint MyPassPhrase"
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echo " $(basename $0) --driver rtl871xdrv wlan0 eth0 MyAccessPoint MyPassPhrase"
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}
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# it takes 2 arguments
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# returns:
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# 0 if v1 (1st argument) and v2 (2nd argument) are the same
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# 1 if v1 is less than v2
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# 2 if v2 is greater than v2
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version_cmp() {
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[[ ! $1 =~ ^[0-9]+(\.[0-9]+)*$ ]] && die "Wrong version format!"
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[[ ! $2 =~ ^[0-9]+(\.[0-9]+)*$ ]] && die "Wrong version format!"
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V1=( $(echo $1 | tr '.' ' ') )
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V2=( $(echo $2 | tr '.' ' ') )
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VN=${#V1[@]}
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[[ $VN -lt ${#V2[@]} ]] && VN=${#V2[@]}
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for ((x = 0; x < $VN; x++)); do
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[[ ${V1[x]} -lt ${V2[x]} ]] && return 1
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[[ ${V1[x]} -gt ${V2[x]} ]] && return 2
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done
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return 0
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}
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get_macaddr() {
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ip link show "$1" | grep ether | grep -Eo '([0-9a-f]{2}:){5}[0-9a-f]{2}[[:space:]]' | tr -d '[[:space:]]'
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}
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get_avail_bridge() {
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for i in {0..100}; do
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curr_bridge=$(brctl show | grep "br$i" | cut -s -f1)
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if [[ -z $curr_bridge ]]; then
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echo "br$i"
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return
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fi
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done
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}
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get_new_macaddr() {
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OLDMAC=$(get_macaddr "$1")
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for i in {20..255}; do
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NEWMAC="${OLDMAC%:*}:$(printf %02x $i)"
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(ip link | grep "ether ${NEWMAC}" > /dev/null 2>&1) || break
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done
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echo $NEWMAC
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}
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ADDED_UNMANAGED=0
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NETWORKMANAGER_CONF=/etc/NetworkManager/NetworkManager.conf
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networkmanager_is_running() {
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which nmcli > /dev/null 2>&1 || return 1
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NM_VER=$(nmcli -v | grep -m1 -oE '[0-9]+(\.[0-9]+)*\.[0-9]+')
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version_cmp $NM_VER 0.9.10
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if [[ $? -eq 1 ]]; then
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NMCLI_OUT=$(nmcli -t -f RUNNING nm)
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else
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NMCLI_OUT=$(nmcli -t -f RUNNING g)
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fi
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[[ "$NMCLI_OUT" == "running" ]]
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}
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networkmanager_iface_is_unmanaged() {
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nmcli -t -f DEVICE,STATE d | grep -E "^$1:unmanaged$" > /dev/null 2>&1
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}
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networkmanager_add_unmanaged() {
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networkmanager_is_running || return
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[[ -d ${NETWORKMANAGER_CONF%/*} ]] || mkdir -p ${NETWORKMANAGER_CONF%/*}
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[[ -f ${NETWORKMANAGER_CONF} ]] || touch ${NETWORKMANAGER_CONF}
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if [[ -z "$2" ]]; then
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MAC=$(get_macaddr "$1")
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else
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MAC="$2"
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fi
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UNMANAGED=$(grep -m1 -Eo "^unmanaged-devices=.*" ${NETWORKMANAGER_CONF})
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[[ $UNMANAGED == *mac:${MAC}* ]] && return
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echo -n "Network Manager config found, set $1 as unmanaged device... "
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grep -E '^\[keyfile\]' ${NETWORKMANAGER_CONF} > /dev/null 2>&1 || echo -e '\n\n[keyfile]' >> ${NETWORKMANAGER_CONF}
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if [[ -z ${UNMANAGED} ]]; then
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sed -e "s/^\(\[keyfile\].*\)$/\1\nunmanaged-devices=mac:${MAC}/" -i ${NETWORKMANAGER_CONF}
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else
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NEW_UNMANAGED=$(echo "${UNMANAGED}" | sed -e "s/^\([[:alnum:]=:;-]*\)/\1;mac:${MAC}/")
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sed -e "s/^${UNMANAGED}/${NEW_UNMANAGED}/" -i ${NETWORKMANAGER_CONF}
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fi
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ADDED_UNMANAGED=1
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while ! networkmanager_iface_is_unmanaged "$1"; do
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sleep 1
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done
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sleep 1
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echo "DONE"
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}
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networkmanager_rm_unmanaged() {
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[[ $ADDED_UNMANAGED -eq 0 ]] && return
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[[ ! -f ${NETWORKMANAGER_CONF} ]] && return
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if [[ -z "$2" ]]; then
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MAC=$(get_macaddr "$1")
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else
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MAC="$2"
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fi
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UNMANAGED=$(grep -m1 -Eo "^unmanaged-devices=.*" ${NETWORKMANAGER_CONF})
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if [[ $UNMANAGED != *\;* ]]; then
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sed -e "/^unmanaged-devices=mac:${MAC}/d" -i ${NETWORKMANAGER_CONF}
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else
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NEW_UNMANAGED=$(echo ${UNMANAGED} | sed -e "s/;mac:${MAC}//")
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sed -e "s/^${UNMANAGED}/${NEW_UNMANAGED}/" -i ${NETWORKMANAGER_CONF}
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fi
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while networkmanager_iface_is_unmanaged "$1"; do
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sleep 1
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done
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sleep 1
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}
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CHANNEL=1
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GATEWAY=192.168.12.1
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WPA_VERSION=1+2
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ETC_HOSTS=0
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HIDDEN=0
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SHARE_METHOD=nat
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IEEE80211N=0
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HT_CAPAB='[HT40+]'
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DRIVER=nl80211
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NO_VIRT=0
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CONFDIR=
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WIFI_IFACE=
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VWIFI_IFACE=
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INTERNET_IFACE=
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BRIDGE_IFACE=
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OLD_IP_FORWARD=
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OLD_BRIDGE_IPTABLES=
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OLD_MACADDR=
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cleanup() {
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echo
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echo "Doing cleanup..."
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# exiting
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for x in $CONFDIR/*.pid; do
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# even if the $CONFDIR is empty, the for loop will assign
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# a value in $x. so we need to check if the value is a file
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[[ -f $x ]] && kill -9 $(cat $x)
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done
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rm -rf $CONFDIR
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if [[ "$SHARE_METHOD" != "none" ]]; then
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if [[ "$SHARE_METHOD" == "nat" ]]; then
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iptables -t nat -D POSTROUTING -o ${INTERNET_IFACE} -j MASQUERADE
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iptables -D FORWARD -i ${WIFI_IFACE} -s ${GATEWAY%.*}.0/24 -j ACCEPT
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iptables -D FORWARD -i ${INTERNET_IFACE} -d ${GATEWAY%.*}.0/24 -j ACCEPT
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[[ -n $OLD_IP_FORWARD ]] && echo $OLD_IP_FORWARD > /proc/sys/net/ipv4/ip_forward
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elif [[ "$SHARE_METHOD" == "bridge" ]]; then
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ip link set down $BRIDGE_IFACE
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brctl delbr $BRIDGE_IFACE
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[[ -n $OLD_BRIDGE_IPTABLES ]] && echo $OLD_BRIDGE_IPTABLES > /proc/sys/net/bridge/bridge-nf-call-iptables
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fi
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fi
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if [[ "$SHARE_METHOD" != "bridge" ]]; then
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iptables -D INPUT -p tcp -m tcp --dport 53 -j ACCEPT
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iptables -D INPUT -p udp -m udp --dport 53 -j ACCEPT
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iptables -D INPUT -p udp -m udp --dport 67 -j ACCEPT
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fi
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if [[ $NO_VIRT -eq 0 ]]; then
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if [[ -n $VWIFI_IFACE ]]; then
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ip link set down dev ${VWIFI_IFACE}
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ip addr flush ${VWIFI_IFACE}
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networkmanager_rm_unmanaged ${VWIFI_IFACE} ${OLD_MACADDR}
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iw dev ${VWIFI_IFACE} del
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fi
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else
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ip link set down dev ${WIFI_IFACE}
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ip addr flush ${WIFI_IFACE}
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networkmanager_rm_unmanaged ${WIFI_IFACE}
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fi
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}
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die() {
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[[ -n "$1" ]] && echo -e "\nERROR: $1\n" >&2
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cleanup
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exit 1
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}
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# if the user press ctrl+c then execute die()
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trap "die" SIGINT
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ARGS=$(getopt -o hc:w:g:dnm: -l "help","hidden","ieee80211n","ht_capab:","driver:","no-virt" -n $(basename $0) -- "$@")
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[[ $? -ne 0 ]] && exit 1
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eval set -- "$ARGS"
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while :; do
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case "$1" in
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-h|--help)
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usage >&2
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exit 1
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;;
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--hidden)
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shift
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HIDDEN=1
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;;
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-c)
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shift
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CHANNEL="$1"
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shift
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;;
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-w)
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shift
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WPA_VERSION="$1"
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shift
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;;
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-g)
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shift
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GATEWAY="$1"
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shift
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;;
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-d)
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shift
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ETC_HOSTS=1
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;;
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-n)
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shift
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SHARE_METHOD=none
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;;
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-m)
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shift
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SHARE_METHOD="$1"
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shift
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;;
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--ieee80211n)
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shift
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IEEE80211N=1
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;;
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--ht_capab)
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shift
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HT_CAPAB="$1"
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shift
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;;
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--driver)
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shift
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DRIVER="$1"
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shift
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;;
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--no-virt)
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shift
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NO_VIRT=1
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;;
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--)
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shift
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break
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;;
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esac
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done
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if [[ $# -lt 1 ]]; then
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usage >&2
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exit 1
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fi
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if [[ $(id -u) -ne 0 ]]; then
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echo "You must run it as root." >&2
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exit 1
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fi
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if [[ "$SHARE_METHOD" != "nat" && "$SHARE_METHOD" != "bridge" && "$SHARE_METHOD" != "none" ]]; then
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echo "ERROR: Wrong Internet sharing method" >&2
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echo
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usage >&2
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exit 1
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fi
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WIFI_IFACE=$1
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if [[ "$SHARE_METHOD" == "bridge" ]]; then
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OLD_BRIDGE_IPTABLES=$(cat /proc/sys/net/bridge/bridge-nf-call-iptables)
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BRIDGE_IFACE=$(get_avail_bridge)
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if [[ -z $BRIDGE_IFACE ]]; then
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echo "ERROR: No availabe bridges < br100" >&2
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exit 1
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fi
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elif [[ "$SHARE_METHOD" == "nat" ]]; then
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OLD_IP_FORWARD=$(cat /proc/sys/net/ipv4/ip_forward)
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fi
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if [[ "$SHARE_METHOD" != "none" ]]; then
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MIN_REQUIRED_ARGS=2
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else
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MIN_REQUIRED_ARGS=1
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fi
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if [[ $# -gt $MIN_REQUIRED_ARGS ]]; then
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if [[ "$SHARE_METHOD" != "none" ]]; then
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if [[ $# -ne 3 && $# -ne 4 ]]; then
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usage >&2
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exit 1
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fi
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INTERNET_IFACE=$2
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SSID=$3
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PASSPHRASE=$4
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else
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if [[ $# -ne 2 && $# -ne 3 ]]; then
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usage >&2
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exit 1
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fi
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SSID=$2
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PASSPHRASE=$3
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fi
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else
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if [[ "$SHARE_METHOD" != "none" ]]; then
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if [[ $# -ne 2 ]]; then
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usage >&2
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exit 1
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fi
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INTERNET_IFACE=$2
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fi
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if tty -s; then
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read -p "SSID: " SSID
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while :; do
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read -p "Passphrase: " -s PASSPHRASE
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echo
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read -p "Retype passphrase: " -s PASSPHRASE2
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echo
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if [[ "$PASSPHRASE" != "$PASSPHRASE2" ]]; then
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echo "Passphrases do not match."
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else
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break
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fi
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done
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else
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read SSID
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read PASSPHRASE
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fi
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fi
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CONFDIR=$(mktemp -d /tmp/create_ap.${WIFI_IFACE}.conf.XXXXXXXX)
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echo "Config dir: $CONFDIR"
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if [[ $NO_VIRT -eq 0 ]]; then
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VWIFI_IFACE=${WIFI_IFACE}ap
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WIFI_IFACE_CHANNEL=$(iw ${WIFI_IFACE} info | grep channel | awk '{print $2}')
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if [[ -n $WIFI_IFACE_CHANNEL && $WIFI_IFACE_CHANNEL -ne $CHANNEL ]]; then
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echo "hostapd will fail to use channel $CHANNEL because $WIFI_IFACE is already set to channel $WIFI_IFACE_CHANNEL, fallback to channel $WIFI_IFACE_CHANNEL."
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CHANNEL=$WIFI_IFACE_CHANNEL
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fi
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VIRTDIEMSG="Maybe your WiFi adapter does not fully support virtual interfaces.
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Try again with --no-virt."
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echo -n "Creating a virtual WiFi interface... "
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iw dev ${VWIFI_IFACE} del > /dev/null 2>&1
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if iw dev ${WIFI_IFACE} interface add ${VWIFI_IFACE} type __ap; then
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echo "${VWIFI_IFACE} created."
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else
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VWIFI_IFACE=
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die "$VIRTDIEMSG"
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fi
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OLD_MACADDR=$(get_macaddr ${VWIFI_IFACE})
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NEW_MACADDR=$(get_new_macaddr ${VWIFI_IFACE})
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WIFI_IFACE=${VWIFI_IFACE}
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else
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[[ "$WIFI_IFACE" == "$INTERNET_IFACE" ]] && die "You can not share your connection from the same interface if you are using --no-virt option."
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fi
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networkmanager_add_unmanaged ${WIFI_IFACE}
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[[ $HIDDEN -eq 1 ]] && echo "Access Point's SSID is hidden!"
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# hostapd config
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cat << EOF > $CONFDIR/hostapd.conf
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ssid=${SSID}
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interface=${WIFI_IFACE}
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driver=${DRIVER}
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hw_mode=g
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channel=${CHANNEL}
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ctrl_interface=$CONFDIR/hostapd_ctrl
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ctrl_interface_group=0
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ignore_broadcast_ssid=$HIDDEN
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EOF
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if [[ $IEEE80211N -eq 1 ]]; then
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cat << EOF >> $CONFDIR/hostapd.conf
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ieee80211n=1
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wmm_enabled=1
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ht_capab=${HT_CAPAB}
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EOF
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fi
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if [[ -n "$PASSPHRASE" ]]; then
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[[ "$WPA_VERSION" == "1+2" || "$WPA_VERSION" == "2+1" ]] && WPA_VERSION=3
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cat << EOF >> $CONFDIR/hostapd.conf
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wpa=${WPA_VERSION}
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wpa_passphrase=$PASSPHRASE
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wpa_key_mgmt=WPA-PSK
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wpa_pairwise=TKIP CCMP
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rsn_pairwise=CCMP
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EOF
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fi
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if [[ "$SHARE_METHOD" == "bridge" ]]; then
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echo "bridge=${BRIDGE_IFACE}" >> $CONFDIR/hostapd.conf
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else
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# dnsmasq config (dhcp + dns)
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DNSMASQ_VER=$(dnsmasq -v | grep -m1 -oE '[0-9]+(\.[0-9]+)*\.[0-9]+')
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version_cmp $DNSMASQ_VER 2.63
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if [[ $? -eq 1 ]]; then
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DNSMASQ_BIND=bind-interfaces
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else
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DNSMASQ_BIND=bind-dynamic
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fi
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cat << EOF > $CONFDIR/dnsmasq.conf
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interface=${WIFI_IFACE}
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${DNSMASQ_BIND}
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dhcp-range=${GATEWAY%.*}.1,${GATEWAY%.*}.254,255.255.255.0,24h
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dhcp-option=option:router,${GATEWAY}
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EOF
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[[ $ETC_HOSTS -eq 0 ]] && echo no-hosts >> $CONFDIR/dnsmasq.conf
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fi
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# initialize WiFi interface
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if [[ $NO_VIRT -eq 0 ]]; then
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ip link set dev ${WIFI_IFACE} address ${NEW_MACADDR} || die "$VIRTDIEMSG"
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fi
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ip link set down dev ${WIFI_IFACE} || die "$VIRTDIEMSG"
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ip addr flush ${WIFI_IFACE} || die "$VIRTDIEMSG"
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if [[ "$SHARE_METHOD" != "bridge" ]]; then
|
|
ip link set up dev ${WIFI_IFACE} || die "$VIRTDIEMSG"
|
|
ip addr add ${GATEWAY}/24 broadcast ${GATEWAY%.*}.255 dev ${WIFI_IFACE} || die "$VIRTDIEMSG"
|
|
fi
|
|
|
|
# enable Internet sharing
|
|
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 ${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
|
|
# disable iptables rules for bridged interfaces
|
|
echo 0 > /proc/sys/net/bridge/bridge-nf-call-iptables || die
|
|
# create and initialize bridged interface
|
|
brctl addbr ${BRIDGE_IFACE} || die
|
|
brctl addif ${BRIDGE_IFACE} ${INTERNET_IFACE} || die
|
|
ip link set dev ${BRIDGE_IFACE} up || die
|
|
fi
|
|
else
|
|
echo "No Internet sharing"
|
|
fi
|
|
|
|
# boost low-entropy
|
|
if [[ $(cat /proc/sys/kernel/random/entropy_avail) -lt 1000 ]]; then
|
|
which haveged > /dev/null 2>&1 && {
|
|
haveged -w 1024 -p $CONFDIR/haveged.pid
|
|
}
|
|
fi
|
|
|
|
# start dns + dhcp server
|
|
if [[ "$SHARE_METHOD" != "bridge" ]]; then
|
|
iptables -I INPUT -p tcp -m tcp --dport 53 -j ACCEPT || die
|
|
iptables -I INPUT -p udp -m udp --dport 53 -j ACCEPT || die
|
|
iptables -I INPUT -p udp -m udp --dport 67 -j ACCEPT || die
|
|
dnsmasq -C $CONFDIR/dnsmasq.conf -x $CONFDIR/dnsmasq.pid || die
|
|
fi
|
|
|
|
# start access point
|
|
echo "hostapd command-line interface: hostapd_cli -p $CONFDIR/hostapd_ctrl"
|
|
trap - SIGINT # reset trap
|
|
hostapd $CONFDIR/hostapd.conf || die "Failed to run hostapd, maybe a program is interfering."
|
|
|
|
cleanup
|
|
exit 0
|