mirror of
https://github.com/bol-van/zapret.git
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140 lines
3.6 KiB
Bash
140 lines
3.6 KiB
Bash
# there's no route_localnet for ipv6
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# the best we can is to route to link local of the incoming interface
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# OUTPUT - can DNAT to ::1
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# PREROUTING - can't DNAT to ::1. can DNAT to link local of -i interface or to any global addr
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# not a good idea to expose tpws to the world (bind to ::)
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# max wait time for the link local ipv6 on the LAN interface
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LINKLOCAL_WAIT_SEC=${LINKLOCAL_WAIT_SEC:-5}
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get_ipv6_linklocal()
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{
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# $1 - interface name. if empty - any interface
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if exists ip ; then
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local dev
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[ -n "$1" ] && dev="dev $1"
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ip addr show $dev | sed -e 's/^.*inet6 \([^ ]*\)\/[0-9]* scope link.*$/\1/;t;d' | head -n 1
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else
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ifconfig $1 | sed -re 's/^.*inet6 addr: ([^ ]*)\/[0-9]* Scope:Link.*$/\1/;t;d' | head -n 1
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fi
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}
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get_ipv6_global()
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{
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# $1 - interface name. if empty - any interface
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if exists ip ; then
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local dev
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[ -n "$1" ] && dev="dev $1"
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ip addr show $dev | sed -e 's/^.*inet6 \([^ ]*\)\/[0-9]* scope global.*$/\1/;t;d' | head -n 1
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else
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ifconfig $1 | sed -re 's/^.*inet6 addr: ([^ ]*)\/[0-9]* Scope:Global.*$/\1/;t;d' | head -n 1
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fi
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}
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iface_is_up()
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{
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# $1 - interface name
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[ -f /sys/class/net/$1/operstate ] || return
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local state
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read state </sys/class/net/$1/operstate
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[ "$state" != "down" ]
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}
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wait_ifup()
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{
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# $1 - interface name
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local ct=0
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while
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iface_is_up $1 && return
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[ "$ct" -ge "$IFUP_WAIT_SEC" ] && break
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echo waiting for ifup of $1 for another $(($IFUP_WAIT_SEC - $ct)) seconds ...
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ct=$(($ct+1))
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sleep 1
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do :; done
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false
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}
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_dnat6_target()
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{
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# $1 - interface name
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# $2 - var to store target ip6
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# get target ip address for DNAT. prefer link locals
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# tpws should be as inaccessible from outside as possible
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# link local address can appear not immediately after ifup
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# DNAT6_TARGET=- means attempt was made but address was not found (to avoid multiple re-attempts)
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local DNAT6_TARGET DVAR=DNAT6_TARGET_$1
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DVAR=$(echo $DVAR | sed 's/[^a-zA-Z0-9_]/_/g')
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eval DNAT6_TARGET="\$$DVAR"
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[ -n "$2" ] && eval $2=''
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[ -n "$DNAT6_TARGET" ] || {
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local ct=0
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while
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DNAT6_TARGET=$(get_ipv6_linklocal $1)
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[ -n "$DNAT6_TARGET" ] && break
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[ "$ct" -ge "$LINKLOCAL_WAIT_SEC" ] && break
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echo $1: waiting for the link local for another $(($LINKLOCAL_WAIT_SEC - $ct)) seconds ...
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ct=$(($ct+1))
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sleep 1
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do :; done
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[ -n "$DNAT6_TARGET" ] || {
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echo $1: no link local. getting global
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DNAT6_TARGET=$(get_ipv6_global $1)
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[ -n "$DNAT6_TARGET" ] || {
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echo $1: could not get any address
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DNAT6_TARGET=-
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}
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}
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eval $DVAR="$DNAT6_TARGET"
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}
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[ -n "$2" ] && eval $2="$DNAT6_TARGET"
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}
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_set_route_localnet()
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{
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# $1 - 1 = enable, 0 = disable
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# $2,$3,... - interface names
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[ "$DISABLE_IPV4" = "1" ] || {
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local enable="$1"
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shift
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while [ -n "$1" ]; do
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sysctl -q -w net.ipv4.conf.$1.route_localnet="$enable"
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shift
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done
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}
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}
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prepare_route_localnet()
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{
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set_route_localnet 1 "$@"
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}
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unprepare_route_localnet()
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{
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set_route_localnet 0 "$@"
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}
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resolve_lower_devices()
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{
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# $1 - bridge interface name
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[ -d "/sys/class/net/$1" ] && {
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find "/sys/class/net/$1" -follow -maxdepth 1 -name "lower_*" |
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{
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local l lower lowers
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while read lower; do
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lower="$(basename "$lower")"
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l="${lower#lower_*}"
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[ "$l" != "$lower" ] && append_separator_list lowers ' ' '' "$l"
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done
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printf "$lowers"
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}
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}
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}
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default_route_interfaces6()
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{
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sed -nre 's/^00000000000000000000000000000000 00 [0-9a-f]{32} [0-9a-f]{2} [0-9a-f]{32} [0-9a-f]{8} [0-9a-f]{8} [0-9a-f]{8} [0-9a-f]{8} +(.*)$/\1/p' /proc/net/ipv6_route | grep -v '^lo$' | sort -u | xargs
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}
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default_route_interfaces4()
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{
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sed -nre 's/^([^\t]+)\t00000000\t[0-9A-F]{8}\t[0-9A-F]{4}\t[0-9]+\t[0-9]+\t[0-9]+\t00000000.*$/\1/p' /proc/net/route | sort -u | xargs
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}
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