zapret/init.d/sysv/functions

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# init script functions library for desktop linux systems
[ -n "$ZAPRET_BASE" ] || ZAPRET_BASE=/opt/zapret
. "$ZAPRET_BASE/config"
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. "$ZAPRET_BASE/common/base.sh"
. "$ZAPRET_BASE/common/fwtype.sh"
. "$ZAPRET_BASE/common/queue.sh"
. "$ZAPRET_BASE/common/linux_iphelper.sh"
. "$ZAPRET_BASE/common/ipt.sh"
. "$ZAPRET_BASE/common/nft.sh"
. "$ZAPRET_BASE/common/linux_fw.sh"
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user_exists()
{
id -u $1 >/dev/null 2>/dev/null
}
useradd_compat()
{
# $1 - username
# skip for readonly systems
[ -w "/etc" ] && {
if exists useradd ; then
useradd --no-create-home --system --shell /bin/false $1
elif is_linked_to_busybox adduser ; then
# busybox has special adduser syntax
adduser -S -H -D $1
elif exists adduser; then
adduser --no-create-home --system --disabled-login $1
fi
}
user_exists $1
}
prepare_user()
{
# $WS_USER is required to prevent redirection of the traffic originating from TPWS itself
# otherwise infinite loop will occur
# also its good idea not to run tpws as root
user_exists $WS_USER || {
# fallback to daemon if we cant add WS_USER
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useradd_compat $WS_USER || {
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for user in daemon nobody; do
user_exists $user && {
WS_USER=$user
return 0
}
done
return 1
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}
}
}
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# this complex user selection allows to survive in any locked/readonly/minimalistic environment
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[ -n "$WS_USER" ] || WS_USER=tpws
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if prepare_user; then
USEROPT="--user=$WS_USER"
else
WS_USER=1
USEROPT="--uid $WS_USER:$WS_USER"
fi
PIDDIR=/var/run
IPSET_CR="$ZAPRET_BASE/ipset/create_ipset.sh"
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[ -n "$QNUM" ] || QNUM=200
[ -n "$NFQWS" ] || NFQWS="$ZAPRET_BASE/nfq/nfqws"
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NFQWS_OPT_BASE="$USEROPT --dpi-desync-fwmark=$DESYNC_MARK"
NFQWS_OPT_DESYNC_HTTP="${NFQWS_OPT_DESYNC_HTTP:-$NFQWS_OPT_DESYNC}"
NFQWS_OPT_DESYNC_HTTPS="${NFQWS_OPT_DESYNC_HTTPS:-$NFQWS_OPT_DESYNC}"
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NFQWS_OPT_DESYNC_HTTP6="${NFQWS_OPT_DESYNC_HTTP6:-$NFQWS_OPT_DESYNC_HTTP}"
NFQWS_OPT_DESYNC_HTTPS6="${NFQWS_OPT_DESYNC_HTTPS6:-$NFQWS_OPT_DESYNC_HTTPS}"
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[ -n "$TPPORT" ] || TPPORT=988
[ -n "$TPWS" ] || TPWS="$ZAPRET_BASE/tpws/tpws"
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TPWS_LOCALHOST4=127.0.0.127
HOSTLIST="$ZAPRET_BASE/ipset/zapret-hosts.txt.gz"
[ -f "$HOSTLIST" ] || HOSTLIST="$ZAPRET_BASE/ipset/zapret-hosts.txt"
[ -f "$HOSTLIST" ] || HOSTLIST="$ZAPRET_BASE/ipset/zapret-hosts-user.txt"
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TPWS_OPT_BASE="$USEROPT"
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TPWS_OPT_BASE4="--bind-addr=$TPWS_LOCALHOST4"
TPWS_OPT_BASE6="--bind-addr=::1"
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TPWS_WAIT="--bind-wait-ifup=30 --bind-wait-ip=30"
TPWS_WAIT_SOCKS6="$TPWS_WAIT --bind-wait-ip-linklocal=30"
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# first wait for lan to ifup, then wait for bind-wait-ip-linklocal seconds for link local address and bind-wait-ip for any ipv6 as the worst case
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TPWS_OPT_BASE6_PRE="--bind-linklocal=prefer $TPWS_WAIT --bind-wait-ip-linklocal=3"
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[ -n "$DESYNC_MARK" ] || DESYNC_MARK=0x40000000
# max wait time for the link local ipv6 on the LAN interface
LINKLOCAL_WAIT_SEC=5
CUSTOM_SCRIPT="$ZAPRET_BASE/init.d/sysv/custom"
[ -f "$CUSTOM_SCRIPT" ] && . "$CUSTOM_SCRIPT"
IPSET_EXCLUDE="-m set ! --match-set nozapret"
IPSET_EXCLUDE6="-m set ! --match-set nozapret6"
# there's no route_localnet for ipv6
# the best we can is to route to link local of the incoming interface
# OUTPUT - can DNAT to ::1
# PREROUTING - can't DNAT to ::1. can DNAT to link local of -i interface or to any global addr
# not a good idea to expose tpws to the world (bind to ::)
dnat6_target()
{
# $1 - lan network name
# $2 - var to store target ip6
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# get target ip address for DNAT. prefer link locals
# tpws should be as inaccessible from outside as possible
# link local address can appear not immediately after ifup
# DNAT6_TARGET=- means attempt was made but address was not found (to avoid multiple re-attempts)
local DNAT6_TARGET DVAR=DNAT6_TARGET_$1
DVAR=$(echo $DVAR | sed 's/[^a-zA-Z0-9_]/_/g')
eval DNAT6_TARGET="\$$DVAR"
[ -n "$2" ] && eval $2=''
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[ -n "$DNAT6_TARGET" ] || {
local ct=0
while
DNAT6_TARGET=$(get_ipv6_linklocal $1)
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[ -n "$DNAT6_TARGET" ] && break
[ "$ct" -ge "$LINKLOCAL_WAIT_SEC" ] && break
echo $1: waiting for the link local for another $(($LINKLOCAL_WAIT_SEC - $ct)) seconds ...
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ct=$(($ct+1))
sleep 1
do :; done
[ -n "$DNAT6_TARGET" ] || {
echo $1: no link local. getting global
DNAT6_TARGET=$(get_ipv6_global $1)
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[ -n "$DNAT6_TARGET" ] || {
echo $1: could not get any address
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DNAT6_TARGET=-
}
}
eval $DVAR="$DNAT6_TARGET"
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}
[ -n "$2" ] && eval $2="$DNAT6_TARGET"
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}
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set_route_localnet()
{
# $1 - 1 = enable, 0 = disable
[ "$DISABLE_IPV4" = "1" ] || {
local lan
for lan in $IFACE_LAN ; do
sysctl -q -w net.ipv4.conf.$lan.route_localnet=$1
done
}
}
prepare_route_localnet()
{
set_route_localnet 1
}
unprepare_route_localnet()
{
set_route_localnet 0
}
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prepare_tpws_fw4()
{
# otherwise linux kernel will treat 127.0.0.0/8 as "martian" ip and refuse routing to it
# NOTE : kernels <3.6 do not have this feature. consider upgrading or change DNAT to REDIRECT and do not bind to 127.0.0.0/8
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[ "$DISABLE_IPV4" = "1" ] || {
[ -n "$IFACE_LAN" ] && {
local lan
iptables -N input_rule_zapret 2>/dev/null
iptables -F input_rule_zapret
iptables -A input_rule_zapret -d $TPWS_LOCALHOST4 -j RETURN
iptables -A input_rule_zapret -d 127.0.0.0/8 -j DROP
ipt INPUT ! -i lo -j input_rule_zapret
prepare_route_localnet
}
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}
}
unprepare_tpws_fw4()
{
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[ "$DISABLE_IPV4" = "1" ] || {
[ -n "$IFACE_LAN" ] && {
local lan
unprepare_route_localnet
ipt_del INPUT ! -i lo -j input_rule_zapret
iptables -F input_rule_zapret 2>/dev/null
iptables -X input_rule_zapret 2>/dev/null
}
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}
}
unprepare_tpws_fw()
{
unprepare_tpws_fw4
}
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ipt_print_op()
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{
if [ "$1" = "1" ]; then
echo "Adding ip$4tables rule for $3 : $2"
else
echo "Deleting ip$4tables rule for $3 : $2"
fi
}
fw_tpws4()
{
# $1 - 1 - add, 0 - del
# $2 - iptable filter for ipv4
# $3 - tpws port
[ "$DISABLE_IPV4" = "1" ] || {
[ "$1" = 1 ] && prepare_tpws_fw4
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ipt_print_op $1 "$2" "tpws (port $3)"
for lan in $IFACE_LAN ; do
ipt_add_del $1 PREROUTING -t nat -i $lan -p tcp $2 $IPSET_EXCLUDE dst -j DNAT --to $TPWS_LOCALHOST4:$3
done
if [ -n "$IFACE_WAN" ]; then
for wan in $IFACE_WAN; do
ipt_add_del $1 OUTPUT -t nat -o $wan -m owner ! --uid-owner $WS_USER -p tcp $2 $IPSET_EXCLUDE dst -j DNAT --to $TPWS_LOCALHOST4:$3
done
else
ipt_add_del $1 OUTPUT -t nat -m owner ! --uid-owner $WS_USER -p tcp $2 $IPSET_EXCLUDE dst -j DNAT --to $TPWS_LOCALHOST4:$3
fi
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}
}
fw_tpws6()
{
# $1 - 1 - add, 0 - del
# $2 - iptable filter for ipv6
# $3 - tpws port
[ "$DISABLE_IPV6" = "1" ] || {
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ipt_print_op $1 "$2" "tpws (port $3)" 6
local DNAT6
for lan in $IFACE_LAN ; do
dnat6_target $lan DNAT6
[ "$DNAT6" != "-" ] && ipt6_add_del $1 PREROUTING -t nat -i $lan -p tcp $2 $IPSET_EXCLUDE6 dst -j DNAT --to [$DNAT6]:$3
done
if [ -n "$IFACE_WAN" ]; then
for wan in $IFACE_WAN; do
ipt6_add_del $1 OUTPUT -t nat -o $wan -m owner ! --uid-owner $WS_USER -p tcp $2 $IPSET_EXCLUDE6 dst -j DNAT --to [::1]:$3
done
else
ipt6_add_del $1 OUTPUT -t nat -m owner ! --uid-owner $WS_USER -p tcp $2 $IPSET_EXCLUDE6 dst -j DNAT --to [::1]:$3
fi
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}
}
fw_tpws()
{
# $1 - 1 - add, 0 - del
# $2 - iptable filter for ipv4
# $3 - iptable filter for ipv6
# $4 - tpws port
fw_tpws4 $1 "$2" $4
fw_tpws6 $1 "$3" $4
}
fw_nfqws_pre4()
{
# $1 - 1 - add, 0 - del
# $2 - iptable filter for ipv4
# $3 - queue number
[ "$DISABLE_IPV4" = "1" ] || {
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ipt_print_op $1 "$2" "nfqws prerouting (qnum $3)"
if [ -n "$IFACE_WAN" ]; then
for wan in $IFACE_WAN; do
ipt_add_del $1 PREROUTING -t mangle -i $wan -p tcp $2 $IPSET_EXCLUDE src -j NFQUEUE --queue-num $3 --queue-bypass
done
else
ipt_add_del $1 PREROUTING -t mangle -p tcp $2 $IPSET_EXCLUDE src -j NFQUEUE --queue-num $3 --queue-bypass
fi
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}
}
fw_nfqws_pre6()
{
# $1 - 1 - add, 0 - del
# $2 - iptable filter for ipv6
# $3 - queue number
[ "$DISABLE_IPV6" = "1" ] || {
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ipt_print_op $1 "$2" "nfqws prerouting (qnum $3)" 6
if [ -n "$IFACE_WAN" ]; then
for wan in $IFACE_WAN; do
ipt6_add_del $1 PREROUTING -t mangle -i $wan -p tcp $2 $IPSET_EXCLUDE6 src -j NFQUEUE --queue-num $3 --queue-bypass
done
else
ipt6_add_del $1 PREROUTING -t mangle -p tcp $2 $IPSET_EXCLUDE6 src -j NFQUEUE --queue-num $3 --queue-bypass
fi
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}
}
fw_nfqws_pre()
{
# $1 - 1 - add, 0 - del
# $2 - iptable filter for ipv4
# $3 - iptable filter for ipv6
# $4 - queue number
fw_nfqws_pre4 $1 "$2" $4
fw_nfqws_pre6 $1 "$3" $4
}
fw_nfqws_post4()
{
# $1 - 1 - add, 0 - del
# $2 - iptable filter for ipv4
# $3 - queue number
[ "$DISABLE_IPV4" = "1" ] || {
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ipt_print_op $1 "$2" "nfqws postrouting (qnum $3)"
if [ -n "$IFACE_WAN" ]; then
for wan in $IFACE_WAN; do
ipt_add_del $1 POSTROUTING -t mangle -o $wan -p tcp $2 $IPSET_EXCLUDE dst -j NFQUEUE --queue-num $3 --queue-bypass
done
else
ipt_add_del $1 POSTROUTING -t mangle -p tcp $2 $IPSET_EXCLUDE dst -j NFQUEUE --queue-num $3 --queue-bypass
fi
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}
}
fw_nfqws_post6()
{
# $1 - 1 - add, 0 - del
# $2 - iptable filter for ipv6
# $3 - queue number
[ "$DISABLE_IPV6" = "1" ] || {
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ipt_print_op $1 "$2" "nfqws postrouting (qnum $3)" 6
if [ -n "$IFACE_WAN" ]; then
for wan in $IFACE_WAN; do
ipt6_add_del $1 POSTROUTING -t mangle -o $wan -p tcp $2 $IPSET_EXCLUDE6 dst -j NFQUEUE --queue-num $3 --queue-bypass
done
else
ipt6_add_del $1 POSTROUTING -t mangle -p tcp $2 $IPSET_EXCLUDE6 dst -j NFQUEUE --queue-num $3 --queue-bypass
fi
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}
}
fw_nfqws_post()
{
# $1 - 1 - add, 0 - del
# $2 - iptable filter for ipv4
# $3 - iptable filter for ipv6
# $4 - queue number
fw_nfqws_post4 $1 "$2" $4
fw_nfqws_post6 $1 "$3" $4
}
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filter_apply_hostlist_target()
{
# $1 - var name of tpws or nfqws params
[ "$MODE_FILTER" = "hostlist" ] && eval $1="\"\$$1 --hostlist=$HOSTLIST\""
}
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run_daemon()
{
# $1 - daemon number : 1,2,3,...
# $2 - daemon
# $3 - daemon args
# use $PIDDIR/$DAEMONBASE$1.pid as pidfile
local DAEMONBASE=$(basename $2)
local PIDFILE=$PIDDIR/$DAEMONBASE$1.pid
echo "Starting daemon $1: $2 $3"
if exists start-stop-daemon ; then
start-stop-daemon -S -p "$PIDFILE" -m -b -x "$2" -- $3
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else
if [ -f "$PIDFILE" ] && pgrep -F "$PIDFILE" "$DAEMONBASE" >/dev/null; then
echo already running
else
"$2" $3 >/dev/null 2>/dev/null &
PID=$!
if [ -n "$PID" ]; then
echo $PID >$PIDFILE
else
echo could not start daemon $1 : $2 $3
false
fi
fi
fi
}
stop_daemon()
{
# $1 - daemon number : 1,2,3,...
# $2 - daemon
# use $PIDDIR/$DAEMONBASE$1.pid as pidfile
local DAEMONBASE=$(basename $2)
local PIDFILE=$PIDDIR/$DAEMONBASE$1.pid
echo "Stopping daemon $1: $2"
if exists start-stop-daemon ; then
start-stop-daemon -K -p "$PIDFILE" -x "$2"
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else
if [ -f "$PIDFILE" ]; then
read PID <"$PIDFILE"
kill $PID
rm -f "$PIDFILE"
else
echo no pidfile : $PIDFILE
fi
fi
}
do_daemon()
{
# $1 - 1 - run, 0 - stop
on_off_function run_daemon stop_daemon "$@"
}
do_tpws()
{
# $1 : 1 - run, 0 - stop
# $2 : daemon number
# $3 : daemon args
[ "$DISABLE_IPV4" = "1" ] && [ "$DISABLE_IPV6" = "1" ] && return 0
local OPT="$TPWS_OPT_BASE"
[ "$DISABLE_IPV4" = "1" ] || OPT="$OPT $TPWS_OPT_BASE4"
[ "$DISABLE_IPV6" = "1" ] || {
OPT="$OPT $TPWS_OPT_BASE6"
for lan in $IFACE_LAN; do
OPT="$OPT --bind-iface6=$lan $TPWS_OPT_BASE6_PRE"
done
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}
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do_daemon $1 $2 "$TPWS" "$OPT $3"
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}
do_tpws_socks()
{
# $1 : 1 - run, 0 - stop
# $2 : daemon number
# $3 : daemon args
[ "$DISABLE_IPV4" = "1" ] && [ "$DISABLE_IPV6" = "1" ] && return 0
local opt="$TPWS_OPT_BASE --socks"
tpws_apply_socks_binds opt
do_daemon $1 $2 "$TPWS" "$opt $3"
}
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do_nfqws()
{
# $1 : 1 - run, 0 - stop
# $2 : daemon number
# $3 : daemon args
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do_daemon $1 $2 "$NFQWS" "$NFQWS_OPT_BASE $3"
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}
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tpws_apply_socks_binds()
{
local o
[ "$DISABLE_IPV4" = "1" ] || o="--bind-addr=127.0.0.1"
[ "$DISABLE_IPV6" = "1" ] || o="$o --bind-addr=::1"
for lan in $IFACE_LAN; do
[ "$DISABLE_IPV4" = "1" ] || o="$o --bind-iface4=$lan $TPWS_WAIT"
[ "$DISABLE_IPV6" = "1" ] || o="$o --bind-iface6=$lan --bind-linklocal=unwanted $TPWS_WAIT_SOCKS6"
done
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eval $1="\"\$$1 $o\""
}
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create_ipset()
{
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echo "Creating ip list table (firewall type $FWTYPE)"
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"$IPSET_CR" "$@"
}
zapret_do_daemons()
{
# $1 - 1 - run, 0 - stop
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local opt qn qns qn6 qns6
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case "${MODE_OVERRIDE:-$MODE}" in
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tpws)
opt="--port=$TPPORT $TPWS_OPT"
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filter_apply_hostlist_target opt
do_tpws $1 1 "$opt"
;;
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tpws-socks)
opt="--port=$TPPORT $TPWS_OPT"
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filter_apply_hostlist_target opt
do_tpws_socks $1 1 "$opt"
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;;
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nfqws)
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get_nfqws_qnums qn qns qn6 qns6
[ -z "$qn" ] || {
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opt="--qnum=$qn $NFQWS_OPT_DESYNC_HTTP"
filter_apply_hostlist_target opt
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do_nfqws $1 1 "$opt"
}
[ -z "$qns" ] || [ "$qns" = "$qn" ] || {
opt="--qnum=$qns $NFQWS_OPT_DESYNC_HTTPS"
filter_apply_hostlist_target opt
do_nfqws $1 2 "$opt"
}
[ -z "$qn6" ] || [ "$qn6" = "$qn" ] || [ "$qn6" = "$qns" ] || {
opt="--qnum=$qn6 $NFQWS_OPT_DESYNC_HTTP6"
filter_apply_hostlist_target opt
do_nfqws $1 3 "$opt"
}
[ -z "$qns6" ] || [ "$qns6" = "$qn" ] || [ "$qns6" = "$qns" ] || [ "$qns6" = "$qn6" ] || {
opt="--qnum=$qns6 $NFQWS_OPT_DESYNC_HTTPS6"
filter_apply_hostlist_target opt
do_nfqws $1 4 "$opt"
}
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;;
custom)
existf zapret_custom_daemons && zapret_custom_daemons $1
;;
esac
return 0
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}
zapret_run_daemons()
{
zapret_do_daemons 1 "$@"
}
zapret_stop_daemons()
{
zapret_do_daemons 0 "$@"
}
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nft_fill_ifsets()
{
local script elements i ALLDEVS flags
# if large sets exist nft works very ineffectively
# looks like it analyzes the whole table blob to find required data pieces
# calling all in one shot helps not to waste cpu time many times
script="flush set inet $ZAPRET_NFT_TABLE wanif
flush set inet $ZAPRET_NFT_TABLE wanif6
flush set inet $ZAPRET_NFT_TABLE lanif"
[ -n "$IFACE_LAN" ] && {
make_comma_list elements $IFACE_LAN
script="${script}
add element inet $ZAPRET_NFT_TABLE lanif { $elements }"
}
[ -n "$IFACE_WAN" ] && {
make_comma_list elements $IFACE_WAN
script="${script}
add element inet $ZAPRET_NFT_TABLE wanif { $elements }
add element inet $ZAPRET_NFT_TABLE wanif6 { $elements }"
}
echo "$script" | nft -f -
[ "$FLOWOFFLOAD" = 'software' -o "$FLOWOFFLOAD" = 'hardware' ] && {
ALLDEVS=$(for i in $IFACE_LAN $IFACE_WAN; do echo $i; done | sort -u | xargs)
[ -n "$ALLDEVS" ] && {
[ "$FLOWOFFLOAD" = 'hardware' ] && nft_hw_offload_supported $ALLDEVS && flags=offload
nft_create_or_update_flowtable "$flags" $ALLDEVS
}
}
}
nft_print_op()
{
echo "Adding nftables ipv$3 rule for $2 : $1"
}
nft_fw_tpws4()
{
# $1 - filter ipv4
# $2 - tpws port
[ "$DISABLE_IPV4" = "1" ] || {
nft_print_op "$1" "tpws (port $2)" 4
nft_add_rule dnat_output skuid != $WS_USER ${IFACE_WAN:+oifname @wanif }meta l4proto tcp $1 ip daddr != @nozapret dnat ip to $TPWS_LOCALHOST4:$2
[ -n "$IFACE_LAN" ] && {
prepare_route_localnet
nft_add_rule dnat_pre iifname @lanif meta l4proto tcp $1 ip daddr != @nozapret dnat ip to $TPWS_LOCALHOST4:$2
}
}
}
nft_fw_tpws6()
{
# $1 - filter ipv6
# $2 - tpws port
local lan DNAT6
[ "$DISABLE_IPV6" = "1" ] || {
nft_print_op "$1" "tpws (port $2)" 6
nft_add_rule dnat_output skuid != $WS_USER ${IFACE_WAN:+oifname @wanif6 }meta l4proto tcp $1 ip6 daddr != @nozapret6 dnat ip6 to [::1]:$2
for lan in $IFACE_LAN ; do
dnat6_target $lan DNAT6
[ "$DNAT6" != '-' ] && nft_add_rule dnat_pre iifname $lan meta l4proto tcp $1 ip6 daddr != @nozapret6 dnat ip6 to [$DNAT6]:$2
done
}
}
nft_fw_tpws()
{
# $1 - filter ipv4
# $2 - filter ipv6
# $3 - tpws port
nft_fw_tpws4 "$1" $3
nft_fw_tpws6 "$2" $3
}
nft_fw_nfqws_post4()
{
# $1 - filter ipv4
# $2 - queue number
local rule
[ "$DISABLE_IPV4" = "1" ] || {
nft_print_op "$1" "nfqws postrouting (qnum $2)" 4
rule="${IFACE_WAN:+oifname @wanif }meta l4proto tcp $1 ip daddr != @nozapret"
nft_add_rule postrouting $rule queue num $2 bypass
nft_add_nfqws_flow_exempt_rule "$rule"
}
}
nft_fw_nfqws_post6()
{
# $1 - filter ipv6
# $2 - queue number
local DEVICE rule
[ "$DISABLE_IPV6" = "1" ] || {
nft_print_op "$1" "nfqws postrouting (qnum $2)" 6
rule="${IFACE_WAN:+oifname @wanif6 }meta l4proto tcp $1 ip6 daddr != @nozapret6"
nft_add_rule postrouting $rule queue num $2 bypass
nft_add_nfqws_flow_exempt_rule "$rule"
}
}
nft_fw_nfqws_post()
{
# $1 - filter ipv4
# $2 - filter ipv6
# $3 - queue number
nft_fw_nfqws_post4 "$1" $3
nft_fw_nfqws_post6 "$2" $3
}