applications/create_ap
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
8f112390b2
create_ap/create_ap

1414 lines
40 KiB
Bash
Executable File
Raw Blame History

#!/bin/bash
# general dependencies:
# bash (to run this script)
# util-linux (for getopt)
# procps or procps-ng
# hostapd
# iproute2
# iw
# iwconfig (you only need this if 'iw' can not recognize your adapter)
# haveged (optional)
# dependencies for 'nat' or 'none' Internet sharing method
# dnsmasq
# iptables
VERSION=0.1
PROGNAME="$(basename $0)"
# make sure that all command outputs are in english
# so we can parse them correctly
export LC_ALL=C
# all new files and directories must be readable only by root.
# in special cases we must use chmod to give any other permissions.
SCRIPT_UMASK=0077
umask $SCRIPT_UMASK
usage() {
echo "Usage: "$PROGNAME" [options] <wifi-interface> [<interface-with-internet>] [<access-point-name> [<passphrase>]]"
echo
echo "Options:"
echo " -h, --help Show this help"
echo " --version Print version number"
echo " -c <channel> Channel number (default: 1)"
echo " -w <WPA version> Use 1 for WPA, use 2 for WPA2, use 1+2 for both (default: 1+2)"
echo " -n Disable Internet sharing (if you use this, don't pass"
echo " the <interface-with-internet> argument)"
echo " -m <method> Method for Internet sharing."
echo " Use: 'nat' for NAT (default)"
echo " 'bridge' for bridging"
echo " 'none' for no Internet sharing (equivalent to -n)"
echo " --hidden Make the Access Point hidden (do not broadcast the SSID)"
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 " --no-haveged Do not run \`haveged' automatically when needed"
echo " --fix-unmanaged If NetworkManager shows your interface as unmanaged after you"
echo " close create_ap, then use this option to switch your interface"
echo " back to managed"
echo " --mac <MAC> Set MAC address"
echo " --daemon Run create_ap in the background"
echo " --stop <id> Send stop command to an already running create_ap. For an <id>"
echo " you can put the PID of create_ap or the WiFi interface. You can"
echo " get them with --list"
echo " --list Show the create_ap processes that are already running"
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 " * 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 " * On bridge method if the <interface-with-internet> is not a bridge interface, then"
echo " a bridge interface is created automatically."
echo
echo "Examples:"
echo " "$PROGNAME" wlan0 eth0 MyAccessPoint MyPassPhrase"
echo " echo -e 'MyAccessPoint\nMyPassPhrase' | "$PROGNAME" wlan0 eth0"
echo " "$PROGNAME" wlan0 eth0 MyAccessPoint"
echo " echo 'MyAccessPoint' | "$PROGNAME" wlan0 eth0"
echo " "$PROGNAME" wlan0 wlan0 MyAccessPoint MyPassPhrase"
echo " "$PROGNAME" -n wlan0 MyAccessPoint MyPassPhrase"
echo " "$PROGNAME" -m bridge wlan0 eth0 MyAccessPoint MyPassPhrase"
echo " "$PROGNAME" -m bridge wlan0 br0 MyAccessPoint MyPassPhrase"
echo " "$PROGNAME" --driver rtl871xdrv wlan0 eth0 MyAccessPoint MyPassPhrase"
echo " "$PROGNAME" --daemon wlan0 eth0 MyAccessPoint MyPassPhrase"
echo " "$PROGNAME" --stop wlan0"
}
# on success it echos a non-zero unused FD
# on error it echos 0
get_avail_fd() {
local x
for x in $(seq 1 $(ulimit -n)); do
if [[ ! -a "/proc/$BASHPID/fd/$x" ]]; then
echo $x
return
fi
done
echo 0
}
# lock file for the mutex counter
COUNTER_LOCK_FILE=/tmp/create_ap.$$.lock
cleanup_lock() {
rm -f $COUNTER_LOCK_FILE
}
init_lock() {
local LOCK_FILE=/tmp/create_ap.all.lock
# we initialize only once
[[ $LOCK_FD -ne 0 ]] && return 0
LOCK_FD=$(get_avail_fd)
[[ $LOCK_FD -eq 0 ]] && return 1
# open/create lock file with write access for all users
# otherwise normal users will not be able to use it.
# to avoid race conditions on creation, we need to
# use umask to set the permissions.
umask 0555
eval "exec $LOCK_FD>$LOCK_FILE" > /dev/null 2>&1 || return 1
umask $SCRIPT_UMASK
# there is a case where lock file was created from a normal
# user. change the owner to root as soon as we can.
[[ $(id -u) -eq 0 ]] && chown 0:0 $LOCK_FILE
# create mutex counter lock file
echo 0 > $COUNTER_LOCK_FILE
return $?
}
# recursive mutex lock for all create_ap processes
mutex_lock() {
local counter_mutex_fd
local counter
# lock local mutex and read counter
counter_mutex_fd=$(get_avail_fd)
if [[ $counter_mutex_fd -ne 0 ]]; then
eval "exec $counter_mutex_fd<>$COUNTER_LOCK_FILE"
flock $counter_mutex_fd
read -u $counter_mutex_fd counter
else
echo "Failed to lock mutex counter" >&2
return 1
fi
# lock global mutex and increase counter
[[ $counter -eq 0 ]] && flock $LOCK_FD
counter=$(( $counter + 1 ))
# write counter and unlock local mutex
echo $counter > /proc/$BASHPID/fd/$counter_mutex_fd
eval "exec ${counter_mutex_fd}<&-"
return 0
}
# recursive mutex unlock for all create_ap processes
mutex_unlock() {
local counter_mutex_fd
local counter
# lock local mutex and read counter
counter_mutex_fd=$(get_avail_fd)
if [[ $counter_mutex_fd -ne 0 ]]; then
eval "exec $counter_mutex_fd<>$COUNTER_LOCK_FILE"
flock $counter_mutex_fd
read -u $counter_mutex_fd counter
else
echo "Failed to lock mutex counter" >&2
return 1
fi
# decrease counter and unlock global mutex
if [[ $counter -gt 0 ]]; then
counter=$(( $counter - 1 ))
[[ $counter -eq 0 ]] && flock -u $LOCK_FD
fi
# write counter and unlock local mutex
echo $counter > /proc/$BASHPID/fd/$counter_mutex_fd
eval "exec ${counter_mutex_fd}<&-"
return 0
}
# it takes 2 arguments
# returns:
# 0 if v1 (1st argument) and v2 (2nd argument) are the same
# 1 if v1 is less than v2
# 2 if v1 is greater than v2
version_cmp() {
local V1 V2 VN x
[[ ! $1 =~ ^[0-9]+(\.[0-9]+)*$ ]] && die "Wrong version format!"
[[ ! $2 =~ ^[0-9]+(\.[0-9]+)*$ ]] && die "Wrong version format!"
V1=( $(echo $1 | tr '.' ' ') )
V2=( $(echo $2 | tr '.' ' ') )
VN=${#V1[@]}
[[ $VN -lt ${#V2[@]} ]] && VN=${#V2[@]}
for ((x = 0; x < $VN; x++)); do
[[ ${V1[x]} -lt ${V2[x]} ]] && return 1
[[ ${V1[x]} -gt ${V2[x]} ]] && return 2
done
return 0
}
USE_IWCONFIG=0
is_interface() {
[[ -z "$1" ]] && return 1
[[ -d "/sys/class/net/${1}" ]]
}
is_wifi_interface() {
which iw > /dev/null 2>&1 && iw dev $1 info > /dev/null 2>&1 && return 0
if which iwconfig > /dev/null 2>&1 && iwconfig $1 > /dev/null 2>&1; then
USE_IWCONFIG=1
return 0
fi
return 1
}
is_bridge_interface() {
[[ -z "$1" ]] && return 1
[[ -d "/sys/class/net/${1}/bridge" ]]
}
get_phy_device() {
local x
for x in /sys/class/ieee80211/*; do
[[ ! -e "$x" ]] && continue
if [[ "${x##*/}" = "$1" ]]; then
echo $1
return 0
elif [[ -e "$x/device/net/$1" ]]; then
echo ${x##*/}
return 0
elif [[ -e "$x/device/net:$1" ]]; then
echo ${x##*/}
return 0
fi
done
echo "Failed to get phy interface" >&2
return 1
}
get_adapter_info() {
local PHY
PHY=$(get_phy_device "$1")
[[ $? -ne 0 ]] && return 1
iw phy $PHY info
}
get_adapter_kernel_module() {
local MODULE
MODULE=$(readlink -f "/sys/class/net/$1/device/driver/module")
echo ${MODULE##*/}
}
can_be_sta_and_ap() {
# iwconfig does not provide this information, assume false
[[ $USE_IWCONFIG -eq 1 ]] && return 1
get_adapter_info "$1" | grep -E '{.* managed.* AP.*}' > /dev/null 2>&1 && return 0
get_adapter_info "$1" | grep -E '{.* AP.* managed.*}' > /dev/null 2>&1 && return 0
return 1
}
can_be_ap() {
# iwconfig does not provide this information, assume true
[[ $USE_IWCONFIG -eq 1 ]] && return 0
get_adapter_info "$1" | grep -E '\* AP$' > /dev/null 2>&1 && return 0
return 1
}
can_transmit_to_channel() {
local IFACE CHANNEL_NUM CHANNEL_INFO
IFACE=$1
CHANNEL_NUM=$2
if [[ $USE_IWCONFIG -eq 0 ]]; then
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
[[ "${CHANNEL_INFO}" == *disabled* ]] && return 1
return 0
else
CHANNEL_NUM=$(printf '%02d' ${CHANNEL_NUM})
CHANNEL_INFO=$(iwlist ${IFACE} channel | grep "Channel ${CHANNEL_NUM} :")
[[ -z "${CHANNEL_INFO}" ]] && return 1
return 0
fi
}
# taken from iw/util.c
ieee80211_frequency_to_channel() {
local FREQ=$1
if [[ $FREQ -eq 2484 ]]; then
echo 14
elif [[ $FREQ -lt 2484 ]]; then
echo $(( ($FREQ - 2407) / 5 ))
elif [[ $FREQ -ge 4910 && $FREQ -le 4980 ]]; then
echo $(( ($FREQ - 4000) / 5 ))
elif [[ $FREQ -le 45000 ]]; then
echo $(( ($FREQ - 5000) / 5 ))
elif [[ $FREQ -ge 58320 && $FREQ -le 64800 ]]; then
echo $(( ($FREQ - 56160) / 2160 ))
else
echo 0
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
else
iwconfig "$1" 2>&1 | grep -E 'Access Point: [0-9a-fA-F]{2}:' > /dev/null 2>&1 && return 0
fi
return 1
}
is_macaddr() {
echo "$1" | grep -E "^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$" > /dev/null 2>&1
}
is_unicast_macaddr() {
local x
is_macaddr "$1" || return 1
x=$(echo "$1" | cut -d: -f1)
x=$(printf '%d' "0x${x}")
[[ $(expr $x % 2) -eq 0 ]]
}
get_macaddr() {
is_interface "$1" || return
cat "/sys/class/net/${1}/address"
}
alloc_new_iface() {
local prefix=$1
local i=0
mutex_lock
while :; do
if ! is_interface $prefix$i && [[ ! -f $COMMON_CONFDIR/ifaces/$prefix$i ]]; then
mkdir -p $COMMON_CONFDIR/ifaces
touch $COMMON_CONFDIR/ifaces/$prefix$i
echo $prefix$i
mutex_unlock
return
fi
i=$((i + 1))
done
mutex_unlock
}
dealloc_iface() {
rm -f $COMMON_CONFDIR/ifaces/$1
}
get_all_macaddrs() {
cat /sys/class/net/*/address
}
get_new_macaddr() {
local OLDMAC NEWMAC LAST_BYTE i
OLDMAC=$(get_macaddr "$1")
LAST_BYTE=$(printf %d 0x${OLDMAC##*:})
mutex_lock
for i in {1..255}; do
NEWMAC="${OLDMAC%:*}:$(printf %02x $(( ($LAST_BYTE + $i) % 256 )))"
(get_all_macaddrs | grep "$NEWMAC" > /dev/null 2>&1) || break
done
mutex_unlock
echo $NEWMAC
}
# start haveged when needed
haveged_watchdog() {
local show_warn=1
while :; do
mutex_lock
if [[ $(cat /proc/sys/kernel/random/entropy_avail) -lt 1000 ]]; then
if ! which haveged > /dev/null 2>&1; then
if [[ $show_warn -eq 1 ]]; then
echo "WARN: Low entropy detected. We recommend you to install \`haveged'"
show_warn=0
fi
elif ! pidof haveged > /dev/null 2>&1; then
echo "Low entropy detected, starting haveged"
# boost low-entropy
haveged -w 1024 -p $COMMON_CONFDIR/haveged.pid
fi
fi
mutex_unlock
sleep 2
done
}
NETWORKMANAGER_CONF=/etc/NetworkManager/NetworkManager.conf
NM_OLDER_VERSION=1
networkmanager_exists() {
local NM_VER
which nmcli > /dev/null 2>&1 || return 1
NM_VER=$(nmcli -v | grep -m1 -oE '[0-9]+(\.[0-9]+)*\.[0-9]+')
version_cmp $NM_VER 0.9.9
if [[ $? -eq 1 ]]; then
NM_OLDER_VERSION=1
else
NM_OLDER_VERSION=0
fi
return 0
}
networkmanager_is_running() {
local NMCLI_OUT
networkmanager_exists || return 1
if [[ $NM_OLDER_VERSION -eq 1 ]]; then
NMCLI_OUT=$(nmcli -t -f RUNNING nm)
else
NMCLI_OUT=$(nmcli -t -f RUNNING g)
fi
[[ "$NMCLI_OUT" == "running" ]]
}
networkmanager_iface_is_unmanaged() {
is_interface "$1" || return 2
(nmcli -t -f DEVICE,STATE d | grep -E "^$1:unmanaged$" > /dev/null 2>&1) || return 1
}
ADDED_UNMANAGED=
networkmanager_add_unmanaged() {
local MAC UNMANAGED WAS_EMPTY x
networkmanager_exists || return 1
[[ -d ${NETWORKMANAGER_CONF%/*} ]] || mkdir -p ${NETWORKMANAGER_CONF%/*}
[[ -f ${NETWORKMANAGER_CONF} ]] || touch ${NETWORKMANAGER_CONF}
if [[ $NM_OLDER_VERSION -eq 1 ]]; then
if [[ -z "$2" ]]; then
MAC=$(get_macaddr "$1")
else
MAC="$2"
fi
[[ -z "$MAC" ]] && return 1
fi
mutex_lock
UNMANAGED=$(grep -m1 -Eo '^unmanaged-devices=[[:alnum:]:;,-]*' /etc/NetworkManager/NetworkManager.conf)
WAS_EMPTY=0
[[ -z "$UNMANAGED" ]] && WAS_EMPTY=1
UNMANAGED=$(echo "$UNMANAGED" | sed 's/unmanaged-devices=//' | tr ';,' ' ')
# if it exists, do nothing
for x in $UNMANAGED; do
if [[ $x == "mac:${MAC}" ]] ||
[[ $NM_OLDER_VERSION -eq 0 && $x == "interface-name:${1}" ]]; then
mutex_unlock
return 2
fi
done
if [[ $NM_OLDER_VERSION -eq 1 ]]; then
UNMANAGED="${UNMANAGED} mac:${MAC}"
else
UNMANAGED="${UNMANAGED} interface-name:${1}"
fi
UNMANAGED=$(echo $UNMANAGED | sed -e 's/^ //')
UNMANAGED="${UNMANAGED// /;}"
UNMANAGED="unmanaged-devices=${UNMANAGED}"
if ! grep -E '^\[keyfile\]' ${NETWORKMANAGER_CONF} > /dev/null 2>&1; then
echo -e "\n\n[keyfile]\n${UNMANAGED}" >> ${NETWORKMANAGER_CONF}
elif [[ $WAS_EMPTY -eq 1 ]]; then
sed -e "s/^\(\[keyfile\].*\)$/\1\n${UNMANAGED}/" -i ${NETWORKMANAGER_CONF}
else
sed -e "s/^unmanaged-devices=.*/${UNMANAGED}/" -i ${NETWORKMANAGER_CONF}
fi
ADDED_UNMANAGED="${ADDED_UNMANAGED} ${1} "
mutex_unlock
return 0
}
networkmanager_rm_unmanaged() {
local MAC UNMANAGED
networkmanager_exists || return 1
[[ ! -f ${NETWORKMANAGER_CONF} ]] && return 1
if [[ $NM_OLDER_VERSION -eq 1 ]]; then
if [[ -z "$2" ]]; then
MAC=$(get_macaddr "$1")
else
MAC="$2"
fi
[[ -z "$MAC" ]] && return 1
fi
mutex_lock
UNMANAGED=$(grep -m1 -Eo '^unmanaged-devices=[[:alnum:]:;,-]*' /etc/NetworkManager/NetworkManager.conf | sed 's/unmanaged-devices=//' | tr ';,' ' ')
if [[ -z "$UNMANAGED" ]]; then
mutex_unlock
return 1
fi
[[ -n "$MAC" ]] && UNMANAGED=$(echo $UNMANAGED | sed -e "s/mac:${MAC}\( \|$\)//g")
UNMANAGED=$(echo $UNMANAGED | sed -e "s/interface-name:${1}\( \|$\)//g")
UNMANAGED=$(echo $UNMANAGED | sed -e 's/ $//')
if [[ -z "$UNMANAGED" ]]; then
sed -e "/^unmanaged-devices=.*/d" -i ${NETWORKMANAGER_CONF}
else
UNMANAGED="${UNMANAGED// /;}"
UNMANAGED="unmanaged-devices=${UNMANAGED}"
sed -e "s/^unmanaged-devices=.*/${UNMANAGED}/" -i ${NETWORKMANAGER_CONF}
fi
ADDED_UNMANAGED="${ADDED_UNMANAGED/ ${1} /}"
mutex_unlock
return 0
}
networkmanager_fix_unmanaged() {
[[ -f ${NETWORKMANAGER_CONF} ]] || return
mutex_lock
sed -e "/^unmanaged-devices=.*/d" -i ${NETWORKMANAGER_CONF}
mutex_unlock
}
networkmanager_rm_unmanaged_if_needed() {
[[ $ADDED_UNMANAGED =~ .*\ ${1}\ .* ]] && networkmanager_rm_unmanaged $1 $2
}
networkmanager_wait_until_unmanaged() {
local RES
networkmanager_is_running || return 1
while :; do
networkmanager_iface_is_unmanaged "$1"
RES=$?
[[ $RES -eq 0 ]] && break
[[ $RES -eq 2 ]] && die "Interface '${1}' does not exists.
It's probably renamed by a udev rule."
sleep 1
done
sleep 2
return 0
}
CHANNEL=default
GATEWAY=192.168.12.1
WPA_VERSION=1+2
ETC_HOSTS=0
HIDDEN=0
SHARE_METHOD=nat
IEEE80211N=0
HT_CAPAB='[HT40+]'
DRIVER=nl80211
NO_VIRT=0
FIX_UNMANAGED=0
COUNTRY=
FREQ_BAND=2.4
NEW_MACADDR=
DAEMONIZE=0
LIST_RUNNING=0
STOP_ID=
NO_HAVEGED=0
CONFDIR=
WIFI_IFACE=
VWIFI_IFACE=
INTERNET_IFACE=
BRIDGE_IFACE=
OLD_MACADDR=
IP_ADDRS=
ROUTE_ADDRS=
HAVEGED_WATCHDOG_PID=
_cleanup() {
local PID x
trap "" SIGINT SIGUSR1 SIGUSR2 EXIT
mutex_lock
disown -a
# kill haveged_watchdog
[[ -n "$HAVEGED_WATCHDOG_PID" ]] && kill $HAVEGED_WATCHDOG_PID
# kill processes
for x in $CONFDIR/*.pid; do
# even if the $CONFDIR is empty, the for loop will assign
# a value in $x. so we need to check if the value is a file
[[ -f $x ]] && kill -9 $(cat $x)
done
rm -rf $CONFDIR
# if we are the last create_ap instance then set back the common values
if ! has_running_instance; then
# kill common processes
for x in $COMMON_CONFDIR/*.pid; do
[[ -f $x ]] && kill -9 $(cat $x)
done
# set old ip_forward
if [[ -f $COMMON_CONFDIR/ip_forward ]]; then
cp $COMMON_CONFDIR/ip_forward /proc/sys/net/ipv4
rm -f $COMMON_CONFDIR/ip_forward
fi
# set old bridge-nf-call-iptables
if [[ -f $COMMON_CONFDIR/bridge-nf-call-iptables ]]; then
if [[ -e /proc/sys/net/bridge/bridge-nf-call-iptables ]]; then
cp $COMMON_CONFDIR/bridge-nf-call-iptables /proc/sys/net/bridge
fi
rm -f $COMMON_CONFDIR/bridge-nf-call-iptables
fi
rm -rf $COMMON_CONFDIR
fi
if [[ "$SHARE_METHOD" != "none" ]]; then
if [[ "$SHARE_METHOD" == "nat" ]]; then
iptables -t nat -D POSTROUTING -o ${INTERNET_IFACE} -s ${GATEWAY%.*}.0/24 -j MASQUERADE
iptables -D FORWARD -i ${WIFI_IFACE} -s ${GATEWAY%.*}.0/24 -j ACCEPT
iptables -D FORWARD -i ${INTERNET_IFACE} -d ${GATEWAY%.*}.0/24 -j ACCEPT
elif [[ "$SHARE_METHOD" == "bridge" ]]; then
if ! is_bridge_interface $INTERNET_IFACE; then
ip link set dev $BRIDGE_IFACE down
ip link set dev $INTERNET_IFACE down
ip link set dev $INTERNET_IFACE promisc off
ip link set dev $INTERNET_IFACE nomaster
ip link delete $BRIDGE_IFACE type bridge
ip addr flush $INTERNET_IFACE
ip link set dev $INTERNET_IFACE up
dealloc_iface $BRIDGE_IFACE
for x in "${IP_ADDRS[@]}"; do
x="${x/inet/}"
x="${x/secondary/}"
x="${x/dynamic/}"
x=$(echo $x | sed 's/\([0-9]\)sec/\1/g')
x="${x/${INTERNET_IFACE}/}"
ip addr add $x dev $INTERNET_IFACE
done
ip route flush dev $INTERNET_IFACE
for x in "${ROUTE_ADDRS[@]}"; do
[[ -z "$x" ]] && continue
[[ "$x" == default* ]] && continue
ip route add $x dev $INTERNET_IFACE
done
for x in "${ROUTE_ADDRS[@]}"; do
[[ -z "$x" ]] && continue
[[ "$x" != default* ]] && continue
ip route add $x dev $INTERNET_IFACE
done
networkmanager_rm_unmanaged_if_needed $INTERNET_IFACE
fi
fi
fi
if [[ "$SHARE_METHOD" != "bridge" ]]; then
iptables -D INPUT -p tcp -m tcp --dport 53 -j ACCEPT
iptables -D INPUT -p udp -m udp --dport 53 -j ACCEPT
iptables -D INPUT -p udp -m udp --dport 67 -j ACCEPT
fi
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_if_needed ${VWIFI_IFACE} ${OLD_MACADDR}
iw dev ${VWIFI_IFACE} del
dealloc_iface $VWIFI_IFACE
fi
else
ip link set down dev ${WIFI_IFACE}
ip addr flush ${WIFI_IFACE}
if [[ -n "$NEW_MACADDR" ]]; then
ip link set dev ${WIFI_IFACE} address ${OLD_MACADDR}
fi
networkmanager_rm_unmanaged_if_needed ${WIFI_IFACE} ${OLD_MACADDR}
fi
mutex_unlock
cleanup_lock
}
cleanup() {
echo
echo -n "Doing cleanup.. "
_cleanup > /dev/null 2>&1
echo "done"
}
die() {
[[ -n "$1" ]] && echo -e "\nERROR: $1\n" >&2
# send die signal to the main process
[[ $BASHPID -ne $$ ]] && kill -USR2 $$
# we don't need to call cleanup because it's traped on EXIT
exit 1
}
clean_exit() {
# send clean_exit signal to the main process
[[ $BASHPID -ne $$ ]] && kill -USR1 $$
# we don't need to call cleanup because it's traped on EXIT
exit 0
}
list_running() {
local PID IFACE x
mutex_lock
for x in /tmp/create_ap.*; do
if [[ -f $x/pid ]]; then
PID=$(cat $x/pid)
if [[ -d /proc/$PID ]]; then
IFACE=${x#*.}
IFACE=${IFACE%%.*}
echo $PID $IFACE
fi
fi
done
mutex_unlock
}
has_running_instance() {
local PID x
mutex_lock
for x in /tmp/create_ap.*; do
if [[ -f $x/pid ]]; then
PID=$(cat $x/pid)
if [[ -d /proc/$PID ]]; then
mutex_unlock
return 0
fi
fi
done
mutex_lock
return 1
}
is_running_pid() {
list_running | grep -E "^${1} " > /dev/null 2>&1
}
send_stop() {
local x
mutex_lock
# send stop signal to specific pid
if is_running_pid $1; then
kill -USR1 $1
mutex_unlock
return
fi
# send stop signal to specific interface
for x in $(list_running | grep -E " ${1}\$" | cut -f1 -d' '); do
kill -USR1 $x
done
mutex_unlock
}
ARGS=( "$@" )
GETOPT_ARGS=$(getopt -o hc:w:g:dnm: -l "help","hidden","ieee80211n","ht_capab:","driver:","no-virt","fix-unmanaged","country:","freq-band:","mac:","daemon","stop:","list","version","no-haveged" -n "$PROGNAME" -- "$@")
[[ $? -ne 0 ]] && exit 1
eval set -- "$GETOPT_ARGS"
while :; do
case "$1" in
-h|--help)
usage
exit 0
;;
--version)
echo $VERSION
exit 0
;;
--hidden)
shift
HIDDEN=1
;;
-c)
shift
CHANNEL="$1"
shift
;;
-w)
shift
WPA_VERSION="$1"
[[ "$WPA_VERSION" == "2+1" ]] && WPA_VERSION=1+2
shift
;;
-g)
shift
GATEWAY="$1"
shift
;;
-d)
shift
ETC_HOSTS=1
;;
-n)
shift
SHARE_METHOD=none
;;
-m)
shift
SHARE_METHOD="$1"
shift
;;
--ieee80211n)
shift
IEEE80211N=1
;;
--ht_capab)
shift
HT_CAPAB="$1"
shift
;;
--driver)
shift
DRIVER="$1"
shift
;;
--no-virt)
shift
NO_VIRT=1
;;
--fix-unmanaged)
shift
FIX_UNMANAGED=1
;;
--country)
shift
COUNTRY="$1"
shift
;;
--freq-band)
shift
FREQ_BAND="$1"
shift
;;
--mac)
shift
NEW_MACADDR="$1"
shift
;;
--daemon)
shift
DAEMONIZE=1
;;
--stop)
shift
STOP_ID="$1"
shift
;;
--list)
shift
LIST_RUNNING=1
;;
--no-haveged)
shift
NO_HAVEGED=1
;;
--)
shift
break
;;
esac
done
if [[ $# -lt 1 && $FIX_UNMANAGED -eq 0 && -z "$STOP_ID" && $LIST_RUNNING -eq 0 ]]; then
usage >&2
exit 1
fi
trap "cleanup_lock" EXIT
if ! init_lock; then
echo "ERROR: Failed to initialize lock" >&2
exit 1
fi
# if the user press ctrl+c or we get USR1 signal
# then run clean_exit()
trap "clean_exit" SIGINT SIGUSR1
# if we get USR2 signal then run die().
trap "die" SIGUSR2
if [[ $LIST_RUNNING -eq 1 ]]; then
list_running
exit 0
fi
if [[ $(id -u) -ne 0 ]]; then
echo "You must run it as root." >&2
exit 1
fi
if [[ -n "$STOP_ID" ]]; then
send_stop "$STOP_ID"
exit 0
fi
if [[ $FIX_UNMANAGED -eq 1 ]]; then
networkmanager_fix_unmanaged
exit 0
fi
if [[ $DAEMONIZE -eq 1 ]]; then
# remove --daemon
NEW_ARGS=( )
for x in "${ARGS[@]}"; do
[[ "$x" != "--daemon" ]] && NEW_ARGS+=( "$x" )
done
# run a detached create_ap
setsid "$0" "${NEW_ARGS[@]}" &
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 ${WIFI_IFACE}; then
echo "ERROR: '${WIFI_IFACE}' is not a WiFi interface" >&2
exit 1
fi
if ! can_be_ap ${WIFI_IFACE}; then
echo "ERROR: Your adapter does not support AP (master) mode" >&2
exit 1
fi
if ! can_be_sta_and_ap ${WIFI_IFACE}; then
if is_wifi_connected ${WIFI_IFACE}; then
echo "ERROR: Your adapter can not be a station (i.e. be connected) and an AP at the same time" >&2
exit 1
elif [[ $NO_VIRT -eq 0 ]]; then
echo "WARN: Your adapter does not fully support AP virtual interface, enabling --no-virt" >&2
NO_VIRT=1
fi
fi
if [[ $(get_adapter_kernel_module ${WIFI_IFACE}) =~ ^(8192[cd][ue]|8723a[sue])$ ]]; then
if ! strings $(which hostapd) | grep -m1 rtl871xdrv > /dev/null 2>&1; then
echo "ERROR: You need to patch your hostapd with rtl871xdrv patches." >&2
exit 1
fi
if [[ $DRIVER != "rtl871xdrv" ]]; then
echo "WARN: Your adapter needs rtl871xdrv, enabling --driver=rtl871xdrv" >&2
DRIVER=rtl871xdrv
fi
fi
if [[ "$SHARE_METHOD" != "nat" && "$SHARE_METHOD" != "bridge" && "$SHARE_METHOD" != "none" ]]; then
echo "ERROR: Wrong Internet sharing method" >&2
echo
usage >&2
exit 1
fi
if [[ -n "$NEW_MACADDR" ]]; then
if ! is_macaddr "$NEW_MACADDR"; then
echo "ERROR: '${NEW_MACADDR}' is not a valid MAC address" >&2
exit 1
fi
if ! is_unicast_macaddr "$NEW_MACADDR"; then
echo "ERROR: The first byte of MAC address (${NEW_MACADDR}) must be even" >&2
exit 1
fi
if [[ $(get_all_macaddrs | grep -c ${NEW_MACADDR}) -ne 0 ]]; then
echo "WARN: MAC address '${NEW_MACADDR}' already exists. Because of this, you may encounter some problems" >&2
fi
fi
if [[ "$SHARE_METHOD" != "none" ]]; then
MIN_REQUIRED_ARGS=2
else
MIN_REQUIRED_ARGS=1
fi
if [[ $# -gt $MIN_REQUIRED_ARGS ]]; then
if [[ "$SHARE_METHOD" != "none" ]]; then
if [[ $# -ne 3 && $# -ne 4 ]]; then
usage >&2
exit 1
fi
INTERNET_IFACE=$2
SSID=$3
PASSPHRASE=$4
else
if [[ $# -ne 2 && $# -ne 3 ]]; then
usage >&2
exit 1
fi
SSID=$2
PASSPHRASE=$3
fi
else
if [[ "$SHARE_METHOD" != "none" ]]; then
if [[ $# -ne 2 ]]; then
usage >&2
exit 1
fi
INTERNET_IFACE=$2
fi
if tty -s; then
while :; do
read -p "SSID: " SSID
if [[ ${#SSID} -lt 1 || ${#SSID} -gt 32 ]]; then
echo "ERROR: Invalid SSID length ${#SSID} (expected 1..32)" >&2
continue
fi
break
done
while :; do
read -p "Passphrase: " -s PASSPHRASE
echo
if [[ ${#PASSPHRASE} -gt 0 && ${#PASSPHRASE} -lt 8 ]] || [[ ${#PASSPHRASE} -gt 63 ]]; then
echo "ERROR: Invalid passphrase length ${#PASSPHRASE} (expected 8..63)" >&2
continue
fi
read -p "Retype passphrase: " -s PASSPHRASE2
echo
if [[ "$PASSPHRASE" != "$PASSPHRASE2" ]]; then
echo "Passphrases do not match."
else
break
fi
done
else
read SSID
read PASSPHRASE
fi
fi
if [[ "$SHARE_METHOD" != "none" ]] && ! is_interface $INTERNET_IFACE; then
echo "ERROR: '${INTERNET_IFACE}' is not an interface" >&2
exit 1
fi
if [[ ${#SSID} -lt 1 || ${#SSID} -gt 32 ]]; then
echo "ERROR: Invalid SSID length ${#SSID} (expected 1..32)" >&2
exit 1
fi
if [[ ${#PASSPHRASE} -gt 0 && ${#PASSPHRASE} -lt 8 ]] || [[ ${#PASSPHRASE} -gt 63 ]]; then
echo "ERROR: Invalid passphrase length ${#PASSPHRASE} (expected 8..63)" >&2
exit 1
fi
if [[ $(get_adapter_kernel_module ${WIFI_IFACE}) =~ ^rtl[0-9].*$ ]]; then
if [[ -n "$PASSPHRASE" ]]; then
echo "WARN: Realtek drivers usually have problems with WPA1, enabling -w 2" >&2
WPA_VERSION=2
fi
echo "WARN: If AP doesn't work, please read: howto/realtek.md" >&2
fi
if [[ "$SHARE_METHOD" == "bridge" ]]; then
if is_bridge_interface $INTERNET_IFACE; then
BRIDGE_IFACE=$INTERNET_IFACE
else
BRIDGE_IFACE=$(alloc_new_iface br)
fi
fi
if [[ $NO_VIRT -eq 1 && "$WIFI_IFACE" == "$INTERNET_IFACE" ]]; then
echo -n "ERROR: You can not share your connection from the same" >&2
echo " interface if you are using --no-virt option." >&2
exit 1
fi
mutex_lock
trap "cleanup" EXIT
CONFDIR=$(mktemp -d /tmp/create_ap.${WIFI_IFACE}.conf.XXXXXXXX)
echo "Config dir: $CONFDIR"
echo "PID: $$"
echo $$ > $CONFDIR/pid
# to make --list work from any user, we must give read
# permitions to $CONFDIR and $CONFDIR/pid
chmod 755 $CONFDIR
chmod 444 $CONFDIR/pid
COMMON_CONFDIR=/tmp/create_ap.common.conf
mkdir -p $COMMON_CONFDIR
if [[ ! -f $COMMON_CONFDIR/ip_forward ]]; then
cp /proc/sys/net/ipv4/ip_forward $COMMON_CONFDIR
fi
if [[ ! -f $COMMON_CONFDIR/bridge-nf-call-iptables ]] &&
[[ -e /proc/sys/net/bridge/bridge-nf-call-iptables ]]; then
cp /proc/sys/net/bridge/bridge-nf-call-iptables $COMMON_CONFDIR
fi
mutex_unlock
if [[ $NO_VIRT -eq 0 ]]; then
VWIFI_IFACE=$(alloc_new_iface ap)
# in NetworkManager 0.9.9 and above we can set the interface as unmanaged without
# the need of MAC address, so we set it before we create the virtual interface.
if networkmanager_is_running && [[ $NM_OLDER_VERSION -eq 0 ]]; then
echo -n "Network Manager found, set ${VWIFI_IFACE} as unmanaged device... "
networkmanager_add_unmanaged ${VWIFI_IFACE}
# do not call networkmanager_wait_until_unmanaged because interface does not
# exist yet
echo "DONE"
fi
if is_wifi_connected ${WIFI_IFACE}; then
WIFI_IFACE_FREQ=$(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
else
echo
fi
fi
VIRTDIEMSG="Maybe your WiFi adapter does not fully support virtual interfaces.
Try again with --no-virt."
echo -n "Creating a virtual WiFi interface... "
if iw dev ${WIFI_IFACE} interface add ${VWIFI_IFACE} type managed; then
# now we can call networkmanager_wait_until_unmanaged
networkmanager_is_running && [[ $NM_OLDER_VERSION -eq 0 ]] && networkmanager_wait_until_unmanaged ${VWIFI_IFACE}
echo "${VWIFI_IFACE} created."
else
VWIFI_IFACE=
die "$VIRTDIEMSG"
fi
OLD_MACADDR=$(get_macaddr ${VWIFI_IFACE})
if [[ -z "$NEW_MACADDR" && $(get_all_macaddrs | grep -c ${OLD_MACADDR}) -ne 1 ]]; then
NEW_MACADDR=$(get_new_macaddr ${VWIFI_IFACE})
fi
WIFI_IFACE=${VWIFI_IFACE}
else
OLD_MACADDR=$(get_macaddr ${WIFI_IFACE})
fi
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... "
networkmanager_add_unmanaged ${WIFI_IFACE}
networkmanager_wait_until_unmanaged ${WIFI_IFACE}
echo "DONE"
fi
[[ $HIDDEN -eq 1 ]] && echo "Access Point's SSID is hidden!"
# hostapd config
cat << EOF > $CONFDIR/hostapd.conf
beacon_int=100
ssid=${SSID}
interface=${WIFI_IFACE}
driver=${DRIVER}
channel=${CHANNEL}
ctrl_interface=$CONFDIR/hostapd_ctrl
ctrl_interface_group=0
ignore_broadcast_ssid=$HIDDEN
EOF
if [[ -n $COUNTRY ]]; then
[[ $USE_IWCONFIG -eq 0 ]] && iw reg set $COUNTRY
echo "country_code=${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 >> $CONFDIR/hostapd.conf
ieee80211n=1
wmm_enabled=1
ht_capab=${HT_CAPAB}
EOF
fi
if [[ -n "$PASSPHRASE" ]]; then
[[ "$WPA_VERSION" == "1+2" ]] && WPA_VERSION=3
cat << EOF >> $CONFDIR/hostapd.conf
wpa=${WPA_VERSION}
wpa_passphrase=$PASSPHRASE
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP CCMP
rsn_pairwise=CCMP
EOF
fi
if [[ "$SHARE_METHOD" == "bridge" ]]; then
echo "bridge=${BRIDGE_IFACE}" >> $CONFDIR/hostapd.conf
else
# dnsmasq config (dhcp + dns)
DNSMASQ_VER=$(dnsmasq -v | grep -m1 -oE '[0-9]+(\.[0-9]+)*\.[0-9]+')
version_cmp $DNSMASQ_VER 2.63
if [[ $? -eq 1 ]]; then
DNSMASQ_BIND=bind-interfaces
else
DNSMASQ_BIND=bind-dynamic
fi
cat << EOF > $CONFDIR/dnsmasq.conf
listen-address=${GATEWAY}
${DNSMASQ_BIND}
dhcp-range=${GATEWAY%.*}.1,${GATEWAY%.*}.254,255.255.255.0,24h
dhcp-option=option:router,${GATEWAY}
EOF
[[ $ETC_HOSTS -eq 0 ]] && echo no-hosts >> $CONFDIR/dnsmasq.conf
fi
# initialize WiFi interface
if [[ $NO_VIRT -eq 0 && -n "$NEW_MACADDR" ]]; then
ip link set dev ${WIFI_IFACE} address ${NEW_MACADDR} || die "$VIRTDIEMSG"
fi
ip link set down dev ${WIFI_IFACE} || die "$VIRTDIEMSG"
ip addr flush ${WIFI_IFACE} || die "$VIRTDIEMSG"
if [[ $NO_VIRT -eq 1 && -n "$NEW_MACADDR" ]]; then
ip link set dev ${WIFI_IFACE} address ${NEW_MACADDR} || die
fi
if [[ "$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} -s ${GATEWAY%.*}.0/24 -j MASQUERADE || die
iptables -I FORWARD -i ${WIFI_IFACE} -s ${GATEWAY%.*}.0/24 -j ACCEPT || die
iptables -I FORWARD -i ${INTERNET_IFACE} -d ${GATEWAY%.*}.0/24 -j ACCEPT || die
echo 1 > /proc/sys/net/ipv4/ip_forward || die
# to enable clients to establish PPTP connections we must
# load nf_nat_pptp module
modprobe nf_nat_pptp > /dev/null 2>&1
elif [[ "$SHARE_METHOD" == "bridge" ]]; then
# disable iptables rules for bridged interfaces
if [[ -e /proc/sys/net/bridge/bridge-nf-call-iptables ]]; then
echo 0 > /proc/sys/net/bridge/bridge-nf-call-iptables
fi
# to initialize the bridge interface correctly we need to do the following:
#
# 1) save the IPs and route table of INTERNET_IFACE
# 2) if NetworkManager is running set INTERNET_IFACE as unmanaged
# 3) create BRIDGE_IFACE and attach INTERNET_IFACE to it
# 4) set the previously saved IPs and route table to BRIDGE_IFACE
#
# we need the above because BRIDGE_IFACE is the master interface from now on
# and it must know where is connected, otherwise connection is lost.
if ! is_bridge_interface $INTERNET_IFACE; then
echo -n "Create a bridge interface... "
OLD_IFS="$IFS"
IFS=$'\n'
IP_ADDRS=( $(ip addr show $INTERNET_IFACE | grep -A 1 -E 'inet[[:blank:]]' | paste - -) )
ROUTE_ADDRS=( $(ip route show dev $INTERNET_IFACE) )
IFS="$OLD_IFS"
if networkmanager_is_running; then
networkmanager_add_unmanaged $INTERNET_IFACE
networkmanager_wait_until_unmanaged $INTERNET_IFACE
fi
# create bridge interface
ip link add name $BRIDGE_IFACE type bridge || die
ip link set dev $BRIDGE_IFACE up || die
# set 0ms forward delay
echo 0 > /sys/class/net/$BRIDGE_IFACE/bridge/forward_delay
# attach internet interface to bridge interface
ip link set dev $INTERNET_IFACE promisc on || die
ip link set dev $INTERNET_IFACE up || die
ip link set dev $INTERNET_IFACE master $BRIDGE_IFACE || die
ip addr flush $INTERNET_IFACE
for x in "${IP_ADDRS[@]}"; do
x="${x/inet/}"
x="${x/secondary/}"
x="${x/dynamic/}"
x=$(echo $x | sed 's/\([0-9]\)sec/\1/g')
x="${x/${INTERNET_IFACE}/}"
ip addr add $x dev $BRIDGE_IFACE || die
done
# remove any existing entries that were added from 'ip addr add'
ip route flush dev $INTERNET_IFACE
ip route flush dev $BRIDGE_IFACE
# we must first add the entries that specify the subnets and then the
# gateway entry, otherwise 'ip addr add' will return an error
for x in "${ROUTE_ADDRS[@]}"; do
[[ "$x" == default* ]] && continue
ip route add $x dev $BRIDGE_IFACE || die
done
for x in "${ROUTE_ADDRS[@]}"; do
[[ "$x" != default* ]] && continue
ip route add $x dev $BRIDGE_IFACE || die
done
echo "$BRIDGE_IFACE created."
fi
fi
else
echo "No Internet sharing"
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"
if [[ $NO_HAVEGED -eq 0 ]]; then
haveged_watchdog &
HAVEGED_WATCHDOG_PID=$!
fi
# start hostapd
hostapd $CONFDIR/hostapd.conf &
HOSTAPD_PID=$!
echo $HOSTAPD_PID > $CONFDIR/hostapd.pid
if ! wait $HOSTAPD_PID; then
echo -e "\nError: Failed to run hostapd, maybe a program is interfering." >&2
if networkmanager_is_running; then
echo "If an error like 'n80211: Could not configure driver mode' was thrown" >&2
echo "try running the following before starting create_ap:" >&2
if [[ $NM_OLDER_VERSION -eq 1 ]]; then
echo " nmcli nm wifi off" >&2
else
echo " nmcli r wifi off" >&2
fi
echo " rfkill unblock wlan" >&2
fi
die
fi
clean_exit
# Local Variables:
# tab-width: 4
# indent-tabs-mode: nil
# End:
Reference in New Issue View Git Blame Copy Permalink